Tue, 26 May 2015 08:00:00 EDTA formed article comprising a nanostructured ferritic alloy is provided. Advantageously, the article is not formed via extrusion, and thus, cost savings are provided. Methods are also provided for forming the article, and the articles so produced, exhibit sufficient continuous cycle fatigue crack growth resistance and hold time fatigue crack growth resistance to be utilized as turbomachinery components, and in particular, large, hot section components of a gas or steam turbine engines. In other embodiments, a turbomachinery component comprising an NFA is provided, and in some such embodiments, the turbomachinery component may be extruded.
Tue, 26 May 2015 08:00:00 EDTThere are provided a permanent magnet and a manufacturing method thereof enabling carbon content contained in magnet particles to be reduced in advance before sintering even when wet milling is employed. Coarsely-milled magnet powder is further milled by a bead mill in a solvent together with an organometallic compound expressed with a structural formula of M-(OR)X (M represents V, Mo, Zr, Ta Ti W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, X represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the magnet powder. Thereafter, a compact body of compacted magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius to perform hydrogen calcination process. Thereafter, through sintering process, a permanent magnet 1 is formed.
Tue, 19 May 2015 08:00:00 EDTA method of forming a component (30) by isostatic pressing, the method comprising: providing a canister (4) suitable for isostatic pressing, the canister comprising first and second membranes (14, 16) which, in use, are disposed within the canister (4); the first and second membranes (14, 16) defining a component cavity (24) disposed between the first and second membranes (14, 16), a first tool cavity (26) disposed between the first membrane (14) and an adjacent wall (10) of the canister (4), and a second tool cavity (28) disposed between the second membrane (16) and another adjacent wall (12) of the canister (4); filling the component cavity (24) with the component powder for forming the component (30); filling the first and second tool cavities (26, 28) with a second tool powder; and isostatically pressing the canister (4) to form the component (30).
Tue, 19 May 2015 08:00:00 EDTA method and process for at least partially forming a medical device that is at least partially formed of a metal alloy which improves the physical properties of the medical device.
Tue, 12 May 2015 08:00:00 EDTA turbine shroud segment is metal injection molded (MIM) about a low melting point material insert. The low melting point material is dissolved using heat during the heat treatment cycle required for the MIM material, thereby leaving internal cooling passages in the MIM shroud segment without extra manufacturing operation.
Tue, 12 May 2015 08:00:00 EDTProvided is a NdFeB sintered magnet which can be used in the grain boundary diffusion method as a base material in which RH can be easily diffused through the rare-earth rich phase and which itself has a high coercive force, a high maximum energy product and a high squareness ratio, as well as a method for producing such a magnet. A NdFeB system sintered has an average grain size of the main-phase grains magnet is equal to or smaller than 4.5 μm, the carbon content of the entire NdFeB system sintered magnet is equal to or lower than 1000 ppm, and the percentage of the total volume of a carbon rich phase in a rare-earth rich phase at a grain-boundary triple point in the NdFeB system sintered magnet to the total volume of the rare-earth rich phase is equal to or lower than 50%.
Tue, 12 May 2015 08:00:00 EDTSeizure resistance and wear resistance of Cu—Bi—In copper-alloy sliding material are enhanced by forming a soft phase of as pure as possible Bi. Mixed powder of Cu—In cuprous alloy powder and Cu—Bi containing Cu-based alloy powder is used. A sintering condition is set such that Bi moves outside particles of said Cu—Bi containing Cu-based powder and forms a Bi grain-boundary phase free of In, and In diffuses from said Cu—In containing Cu-based powder to said Cu—Bi containing Cu-based powder.
Tue, 28 Apr 2015 08:00:00 EDTA method of forming a wrought material having a refined grain structure is provided. The method comprises providing a metal alloy material having a depressed solidus temperature and a low temperature eutectic phase transformation. The metal alloy material is molded and rapidly solidified to form a fine grain precursor that has fine grains surrounded by a eutectic phase with fine dendritic arm spacing. The fine grain precursor is plastic deformed at a high strain rate to cause recrystallization without substantial shear banding to form a fine grain structural wrought form. The wrought form is then thermally treated to precipitate the eutectic phase into nanometer sized dispersoids within the fine grains and grain boundaries and to define a thermally treated fine grain structure wrought form having grains finer than the fine grains and the fine dendritic arm spacing of the fine grain precursor.
Tue, 28 Apr 2015 08:00:00 EDTAn iron-based sintered alloy of the present invention is an iron-based sintered alloy, which is completed by sintering a powder compact made by press forming a raw material powder composed of Fe mainly, and is such that: when the entirety is taken as 100% by mass, carbon is 0.1-1.0% by mass; Mn is 0.01-1.5% by mass; the sum of the Mn and Si is 0.02-3.5% by mass; and the major balance is Fe. It was found out that, by means of an adequate amount of Mn and Si, iron-based sintered alloys are strengthened and additionally a good dimensional stability is demonstrated. As a result, it is possible to suppress or obsolete the employment of Cu or Ni, which has been believed to be essential virtually, the recyclability of iron-based sintered alloys can be enhanced, and further their cost reduction can be intended.
Tue, 28 Apr 2015 08:00:00 EDTIn various embodiments, planar sputtering targets are produced by forming a billet at least by pressing molybdenum powder in a mold and sintering the pressed powder, working the billet to form a worked billet, heat treating the worked billet, working the worked billet to form a final billet, and heat treating the final billet.
Tue, 28 Apr 2015 08:00:00 EDTThere is provided a sliding part in which a surface coverage ratio of copper in the sliding part increases. A bearing which is the sliding part is formed by filling the raw powder into the filling portion of the forming mold, compacting the raw powder to form a powder compact, which is sintered. A copper-based raw powder is composed of a copper-based flat raw powder whose diameter is smaller than that of an iron-based raw powder and an aspect ratio larger than that of the iron-based raw powder, and a copper-based small-sized raw powder whose diameter is smaller than that of the copper-based flat raw powder. The copper is allowed to segregate at the surface of the sliding part. The surface of the bearing is covered with the copper-based small-sized raw powder and the copper-based flat raw powder, thereby the surface coverage ratio of copper can be increased.
Tue, 28 Apr 2015 08:00:00 EDTA metal-bonded graphite foam composite includes a ductile metal continuous phase and a dispersed phase that includes graphite foam particles.
Tue, 21 Apr 2015 08:00:00 EDTThe present invention is generally directed to nanocomposite thermoelectric materials that exhibit enhanced thermoelectric properties. The nanocomposite materials include two or more components, with at least one of the components forming nano-sized structures within the composite material. The components are chosen such that thermal conductivity of the composite is decreased without substantially diminishing the composite's electrical conductivity. Suitable component materials exhibit similar electronic band structures. For example, a band-edge gap between at least one of a conduction band or a valence band of one component material and a corresponding band of the other component material at interfaces between the components can be less than about 5kBT, wherein kB is the Boltzman constant and T is an average temperature of said nanocomposite composition.
Tue, 21 Apr 2015 08:00:00 EDTThe invention relates to a sintering method for manufacturing structures by sintering. In addition, the invention relates to a sintered product, an electronic module, and new uses. In the method, a particle material containing conductive or semiconductive encapsulated nanoparticles is sintered, in order to increase its electrical conductivity, by applying a voltage over the particle material. In the method, a substrate is typically used, one surface of which is at least partly equipped with a layer containing nanoparticles. The method is based on thermal feedback between the voltage feed and the nanoparticles. The invention permits the manufacture of conductive and semiconductive structures and pieces by sintering at room temperature and at normal pressure.
Tue, 14 Apr 2015 08:00:00 EDTA partly oxidized substrate is disclosed. According to one aspect, the substrate is formed by subjecting a substrate made of a porous metal or metal alloy including particles of at least one metal or metal alloy bound by sintering. The substrate includes a first main surface and a second main surface. The porosity of the substrate gradually changes from the first main surface to the second main surface. The substrate is partially oxidized by an oxidizing gas such as oxygen and/or air. A method for preparing the substrate and high temperature electrolyzer (THE) cell including the substrate are also disclosed.
Tue, 14 Apr 2015 08:00:00 EDTThis invention relates to power metallurgical material, production method and application thereof. A metallurgy powder material with pressure-proof & good compactness, satisfactory to the component content requirements for 316 stainless steel, wherein, 5˜9% (by weight) of Fe3P (or Fe3PO4). The powder metallurgical material has properties of pressure resistance and corrosion resistance, and excellent compactness.
Tue, 14 Apr 2015 08:00:00 EDTThere are provided a permanent magnet and a manufacturing method thereof capable of decreasing an activity level of a calcined body activated by a calcination process. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)x (M represents V, Mo, Zr, Ta, Ti, W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, desiccated magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, the powdery calcined body calcined through the calcination process in hydrogen is held for several hours in vacuum atmosphere at 200 through 600 degrees Celsius for a dehydrogenation process.
Tue, 14 Apr 2015 08:00:00 EDTThe present invention relates to a fine grained WC-Co cemented carbide. By adding an extremely small amount of Ti, V, Zr, Ta or Nb alone or in combinations, a grain refined cemented carbide structure with less abnormal WC-grains has been obtained.
Tue, 07 Apr 2015 08:00:00 EDTNew net shape strength retaining high temperature alloy parts are formed from fine metallurgical powders by mechanically blending the powders and placing them in die, placing a piston in the die, extending the piston into a driving chamber, filling the chamber with CH4 and air and compressing the powders with the filling pressure. Igniting gas in the chamber drives the piston into the cavity, producing pressures of about 85 to 150 tsi, compacting the powders into a near net shape alloy part, ready for sintering at 2300° C. without shrinking. The alloy parts are Re, Mo—Re, W—Re, Re—Hf—HfC, Re—Ta—Hf—HfC, Re—Mo—Hf—HfC, Mo—Re—Ta, Mo—Re-f-HfC, W—Re—Hf—HfC, W—Re—Ta—Hf—HfC or W—Re—Mo—Hf alloys.
Tue, 07 Apr 2015 08:00:00 EDTDisclosed herein is a sintered composition comprising iron; about 0.05 to about 1 wt % molybdenum; about 3 to about 4.5 wt % silicon; about 0.05 to about 0.5 wt % chromium; about 0.011 to about 0.015 wt % magnesium; all weight percents being based on the total weight of the composition; the composition being devoid of carbon except for trace amounts; and wherein the composition is sintered. Disclosed herein too is a method comprising blending a powdered composition that comprises iron; about 0.05 to about 1 wt % molybdenum; about 3 to about 4.5 wt % silicon; about 0.05 to about 0.5 wt % chromium; about 0.011 to about 0.015 wt % magnesium; all weight percents being based on the total weight of the composition; the composition being devoid of carbon except for trace amounts; compacting and sintering the composition.
Tue, 07 Apr 2015 08:00:00 EDTProcess for manufacturing a reinforced alloy comprising a metallic matrix, dispersed in the volume of which are nanoparticles, at least 80% of which have a mean size from 1 nm to 50 nm, the nanoparticles comprising at least one nitride chosen from the nitrides of at least one metallic element M belonging to the group consisting of Ti, Zr, Hf and Ta. The process comprises the following successive steps: a) plasma nitriding of a base alloy is carried out at a temperature from 200° C. to 700° C. in order to insert interstitial nitrogen therein, the base alloy incorporating 0.1% to 1% by weight of the metallic element M and being chosen from an austenitic, ferritic, ferritic-martensitic or nickel-based alloy; b) the interstitial nitrogen is diffused within the base alloy at a temperature of 350° C. to 650° C.; and c) the nitride is precipitated at a temperature from 600° C. to 900° C. over a duration of 10 minutes to 10 hours, in order to form the nanoparticles dispersed in the reinforced alloy.
Tue, 07 Apr 2015 08:00:00 EDTA sintering method with uniaxial pressing includes: a powder filling step of disposing a spent target in an inner space of a frame jig having the inner space piercing in a uniaxial direction, and filling the inner space with a raw material powder for a target to cover an erosion part side of the spent target with the raw material powder for a target, a cushioning-material disposition step of disposing a deformable cushioning material so that the raw material powder for a target with which the inner space has been filled in the powder filling step is sandwiched between the spent target and the deformable cushioning material; and a sintering step of pressing the raw material powder for a target with which the inner space has been filled and the spent target in the uniaxial direction through the cushioning material and sintering them.
Tue, 07 Apr 2015 08:00:00 EDTA method of manufacturing a substrate (16) with a ceramic thermal barrier coating (28, 32). The interface between layers of the coating contains an engineered surface roughness (12, 24) to enhance the mechanical integrity of the bond there between. The surface roughness is formed in a surface of a mold (10,20) and is infused by a subsequently cast layer of material (16, 28). The substrate may be partially sintered (76) prior to application of the coating layer(s) and the coated substrate and coating layer(s) may be co-sintered to form a fully coherent strain-free interlayer.
Tue, 07 Apr 2015 08:00:00 EDTFirst, an ionic liquid is placed on a glass slide, which is then installed in an evaporation apparatus, and a metal (for example, indium) is mounted as a target material at a position facing the ionic liquid, followed by sputter deposition of the metal. After sputtering, the ionic liquid containing nanoparticles dispersed therein is recovered. The nanoparticles are solid nanoparticles. Next, the ionic liquid containing the solid nanoparticles dispersed therein is placed in a test tube and then oxidized by heating in air at 250° C. for 1 hour. As a result, hollow nanoparticles having cavities formed in core portions of the solid nanoparticles are produced.
Tue, 31 Mar 2015 08:00:00 EDTA cubic boron nitride sintered body tool has, at least at a cutting edge, a cubic boron nitride sintered body composed of a cubic boron nitride particle and a binder phase. The binder phase contains at least Al2O3 and a Zr compound. On any straight line in the sintered body, the mean value of a continuous distance occupied by Al2O3 is 0.1-1.0 μm, and the standard deviation of the continuous distance occupied by Al2O3 is not more than 0.8. On the straight line, X/Y is 0.1-1 where X represents the number of points of contact between Al2O3 and the Zr compound, and Y represents the sum of the number of points of contact between Al2O3 and cBN and the number of points of contact between Al2O3 and binder phase component(s) other than Al2O3 and the Zr compound.
Tue, 31 Mar 2015 08:00:00 EDTA method for manufacturing a high ductility Ti-, Ti-alloy or NiTi-foam, meaning a compression strain higher than 10%, includes: preparing a powder suspension of a Ti-, NiTi- or Ti-alloy powder, bringing the said powder suspension into a desired form by gelcasting to form a green artifact. The method also includes a calcination step wherein the green artifact is calcined, and sintering the artifact. The calcination step includes a slow heating step wherein said green artifact is heated at a rate lower or equal to 20° C./hour to a temperature between 400° C. and 600° C. and the Ti-, NiTi- or Ti-alloy powder has a particle size less than 100 μm. A high ductility Ti-, Ti-alloy or NiTi foam, with a compression higher than 10%, with a theoretical density less than 30%, pore size (cell size) between 50 to 1000 μm can be obtained with such a method.
Tue, 31 Mar 2015 08:00:00 EDTA process is provided for producing aluminum-titanium-boron grain refining master alloys containing soluble titanium aluminide and insoluble aluminum boride particles, the process comprising mixing aluminum-boron alloy powder and K2TiF6 salt to obtain a blended mixture, heat treating the mixed powder blend thus obtained in an inert gas furnace just below the melting point of aluminum, at approximately 650 degrees Celcius sufficiently long and compacting the heated powder blend in the form of tablets. The cast grain size of an aluminum- 7 wt % silicon foundry alloy after inoculation with this master alloy at an addition level of 0.02% Ti was less than 200 microns for contact times of upto 15 minutes.
Tue, 31 Mar 2015 08:00:00 EDTThe method relates to a method for producing a strand-like, particularly band-like semi-finished part for electrical contacts, wherein the semi-finished part has a top side intended for making the electrical contact, said top side made from a silver-based composite material in which one or multiple metal oxides or carbon are embedded, and has a carrier layer supporting the composite material made of easily solderable or weldable ignoble metal, and method having the following steps: Powder-metallurgic production of a block made from the silver-based composite material, encasing of the block made of the composite material with a powder made from the easily solderable or weldable ignoble metal, compressing the block, encased by the metal powder, to condense the metal powder, sintering the compressed block in a reducing atmosphere or in an inert atmosphere or in a vacuum, avoiding the formation of fluid eutectics from the silver of the composite material and from the non-precious metal with which the block made from the silver-based composite material is encased, reshaping of the sintered block by extrusion pressing, creating a partial strand with a top side made from composite material and a bottom side made from non-precious metal.
Tue, 31 Mar 2015 08:00:00 EDTAn orthopaedic prosthesis and a method for rapidly manufacturing the same are provided. The orthopaedic prosthesis includes a solid bearing layer, a porous bone-ingrowth layer, and an interdigitating layer therebetween. A laser sintering technique is performed to manufacture the orthopaedic prosthesis.
Tue, 31 Mar 2015 08:00:00 EDTThe present invention disclosed a method of producing a three-dimensional porous tissue in-growth structure. The method includes the steps of depositing a first layer of metal powder and scanning the first layer of metal powder with a laser beam to form a portion of a plurality of predetermined unit cells. Depositing at least one additional layer of metal powder onto a previous layer and repeating the step of scanning a laser beam for at least one of the additional layers in order to continuing forming the predetermined unit cells. The method further includes continuing the depositing and scanning steps to form a medical implant.
Tue, 31 Mar 2015 08:00:00 EDTA metal powder composition including: an iron or iron-based powder composition, and a lubricating combination including a substance A, a substance B, and a substance C; wherein: substance A is a polyolefin, substance B is chosen from a group of saturated and unsaturated fatty acid amides, saturated and unsaturated fatty acid bisamides, saturated fatty alcohols and fatty acid glycerols, and substance C is an amide oligomer having a molecular weight between 500 g/mol and 30 000 g/mol; and wherein the amounts of respective substances A, B and C in weight percent of the iron or iron-based powder composition are: 0.05≦A+B0.5. Also, a method of producing a metal powder composition and a method for producing a green component.
Tue, 24 Mar 2015 08:00:00 EDTDisclosed herein is a method and gas atmosphere for a metal component in a continuous furnace. In one embodiment, the method and gas atmosphere comprises the use of an effective amount, or about 1 to about 10 percent volume of endo-gas, into an atmosphere comprising nitrogen and hydrogen. In another embodiment, there is provided a method sintering metal components in a furnace at a one or more operating temperatures comprising: providing a furnace comprising a belt comprising a wire mesh material wherein the metal components are supported thereupon; and sintering the components in the furnace in an atmosphere comprising nitrogen, hydrogen, and effective amount of endothermic gas at the one or more operating temperatures ranging from about 1800° F. to about 2200° F. wherein the amount of endothermic gas in the atmosphere is such that it is oxidizing to the wire mesh material and reducing to the metal components.
Tue, 24 Mar 2015 08:00:00 EDTA method of forming an article includes forming a layer of a mixture of at least two distinct metal powders selected such that when combined they are chemically in the proportions of a superalloy containing a gamma prime phase, and fusing the powders locally without diffusion to define the shape of a part of the article such that the materials of the distinct metal powders remain substantially chemically segregated forming regions of different chemical composition. The method further includes repeating the forming and fusing until the derived article is formed, and heat treating the finished article such that at least one of the distinct separate materials diffuses to form a gamma prime phase containing superalloy with the other.
Tue, 17 Mar 2015 08:00:00 EDTThe invention relates to a method for producing a strand-like, particularly band-like semi-finished part for electrical contacts, wherein the semi-finished part has a top side intended for making the electrical contact, said top side made from a silver-based composite material in which one or multiple metal oxides or carbon are embedded, and has a carrier layer supporting the composite material made of silver or a silver-based alloy, said method having the following steps: Powder-metallurgic production of a block made from the silver-based composite material, encasing of the block made of the composite material with a powder made primarily of silver, compressing the block, encased by the metal powder, to condense the metal powder, sintering the compressed block, reshaping the sintered block by extrusion pressing, creating a partial strand with a top side made from composite material and a bottom side made from silver or a silver-based alloy.
Tue, 17 Mar 2015 08:00:00 EDTA process for producing a metallic component with an opening or a hollow space by selective laser sintering or laser melting includes melting a metallic powder in layers at appropriate cross-sectional regions by using laser radiation. After the laser sintering or laser melting process, the component is subjected to a fracture splitting process, in which the component is fractured into at least two fractional parts along a fracture line and then the at least two fractional parts are connected to one another at the sites of fracture to form the component. The fracture line contacts or passes through the opening or the hollow space.
Tue, 17 Mar 2015 08:00:00 EDTA bone screw is described which includes a one-piece threaded screw body composed at least partially of a rigid foam. The screw body is headless and includes a bore extending therethrough to define a cannula and thereby providing the screw body with an annular shape defining a radial wall thickness. At least a central portion of the screw body is formed of the rigid foam which defines a matrix having a plurality of inter-connected pores therein. The inter-connected pores are disposed throughout the complete radial wall thickness of the screw body from an outer surface of the screw body to an inner surface thereof within the cannula, such as to permit bone in-growth through the complete radial wall thickness of the annular screw body. The inter-connected pores and the cannula thereby respectively allow bone in-growth through the complete radial wall thickness and the full axial length of the screw body.
Tue, 10 Mar 2015 08:00:00 EDTThere is provided a method for manufacturing a three-dimensional shaped object, the method comprising the repeated steps of: (i) forming a solidified layer by irradiating a predetermined portion of a powder layer with a light beam, thereby allowing a sintering of the powder in the predetermined portion or a melting and subsequent solidification thereof; and (ii) forming another solidified layer by newly forming a powder layer on the resulting solidified layer, followed by the irradiation of a predetermined portion of the powder layer with the light beam, wherein a heater element is disposed on the solidified layer during the repeated steps (i) and (ii), and thereby the heater element is situated within the three-dimensional shaped object.
Tue, 10 Mar 2015 08:00:00 EDTA method of forming nano-structure composite materials that have a binder material and a nanostructure fiber material is described. A precursor material may be formed using a mixture of at least one metal powder and anchored nanostructure materials. The metal powder mixture may be (a) Ni powder and (b) NiAl powder. The anchored nanostructure materials may comprise (i) NiAl powder as a support material and (ii) carbon nanotubes attached to nanoparticles adjacent to a surface of the support material. The process of forming nano-structure composite materials typically involves sintering the mixture under vacuum in a die. When Ni and NiAl are used in the metal powder mixture Ni3Al may form as the binder material after sintering. The mixture is sintered until it consolidates to form the nano-structure composite material.
Tue, 03 Mar 2015 08:00:00 ESTA TiC-based cermet body includes TiC and WC so that the atomic ratio Ti/W is between 2 to 5, and cobalt as the binder phase is present in an amount of between 5 to 25 vol %. Further, the cermet body has at least one element from group V of the periodic table, Mx, so that the atomic ratio Ti/Mx is between 4 to 20 and the atomic ratio W/Mx is between 1 to 6. The cermet body also has Cr in an amount such that the atomic Cr/Co ratio is from 0.025 to 0.14. The cermet body includes both undissolved TiC cores with a rim of (Ti,W,Mx)C alloy as well as (Ti,W,Mx)C grains which have been formed during sintering. A method of making a cermet body is also disclosed.
Tue, 03 Mar 2015 08:00:00 ESTThe present invention relates to a process for producing porous metallic materials comprising the steps of: (a) miming metallic particles with a carbonate additive and a binder, wherein the quantity of carbonate additive in the mixture is in the range of 40 to 90 vol % and compressing the mixture beyond the yield strength of the metallic particles; (b) heating the mixture to a first temperature sufficient to evaporate the binder; (c) heating and maintaining the temperature of the mixture to a second temperature sufficient to sinter the metallic particles but insufficient to decompose or melt the carbonate additive; (d) removing the carbonate additive from the sintered porous metallic material; and optionally (e) heating and maintaining the temperature of the porous metallic material to a third temperature greater than the second temperature so as to enhance the sintering. The present invention also relates to metallic materials produced by such a process.
Tue, 03 Mar 2015 08:00:00 ESTA process for manufacturing mirrors with increased reflectance includes forming a silver layer on a surface of a glass substrate, during which the surface is contacted with a silvering solution, and painting at least one paint layer to cover the silver layer. Between forming the silver layer and the painting, the process includes reheating the silver layer to a temperature of at least 200° C.
Tue, 24 Feb 2015 08:00:00 ESTA powder metal component is made of compacted and sintered powder metal particles such as chromium-containing ferrous-based metal and is porous. Following sintering, the pores are impregnated with relatively smaller particles of ceria and/or yttria. The component is then heat treated and the presence of the impregnated ceria and/or yttria serve as nucleation sites for the formation of desirable oxides, such as chromium oxide, on the surface. The impregnated particles that lie below the protective oxide layer remain available throughout the life of the component in the event the original oxide layer becomes worn or damaged, wherein a renewed protective oxide is formed in such regions due to the presence of the impregnated particles.
Tue, 24 Feb 2015 08:00:00 ESTIn a nanocomposite bulk magnet according to the present invention, nanocomposite magnet powder particles, including an Nd2Fe14B crystalline phase and an α-Fe phase, are combined together. The composition of the magnet is represented by T100-x-y-z-n(B1-qCq)xRyTizMn, where T is at least one transition metal element selected from the group consisting of Fe, Co and Ni and always including Fe, R is at least one rare-earth element including substantially no La or Ce, M is an additive metallic element, and x, y, z, n and q satisfy 4 at %≦x≦10 at %, 6 at %≦y≦10 at %, 0.05 at %≦z≦5 at %, 0 at %≦n≦10 at %, and 0≦q≦0.5, respectively. The powder particles have a minor-axis size of less than 40 μm. And powder particles, of which the major-axis size exceeds 53 μm, account for at least 90 mass % of the entire magnet. And those powder particles are directly combined with each other. Consequently, a full-dense magnet, of which the density is 96% or more of the true density of its material alloy, is realized.
Tue, 24 Feb 2015 08:00:00 ESTRefractory metal powders are dehydrided in a device which includes a preheat chamber for retaining the metal powder fully heated in a hot zone to allow diffusion of hydrogen out of the powder. The powder is cooled in a cooling chamber for a residence time sufficiently short to prevent re-absorption of the hydrogen by the powder. The powder is consolidated by impact on a substrate at the exit of the cooling chamber to build a deposit in solid dense form on the substrate.
Tue, 24 Feb 2015 08:00:00 ESTA method for making a treated super-hard structure, the method including providing a super-hard structure comprising super-hard material selected from polycrystalline cubic boron nitride (PCBN) material or thermally stable polycrystalline diamond (PCD) material; subjecting the super-hard structure to heat treatment at a treatment temperature of greater than 700 degrees centigrade at a treatment pressure at which the super-hard material is not thermodynamically stable, for a treatment period of at least about 5 minutes to produce the treated super-hard structure.
Tue, 24 Feb 2015 08:00:00 ESTThe invention is a process for manufacturing a nano aluminum/alumina metal matrix composite and composition produced therefrom. The process is characterized by providing an aluminum powder having a natural oxide formation layer and an aluminum oxide content between about 0.1 and about 4.5 wt. % and a specific surface area of from about 0.3 and about 5 m2/g, hot working the aluminum powder, and forming a superfine grained matrix aluminum alloy. Simultaneously there is formed in situ a substantially uniform distribution of nano particles of alumina. The alloy has a substantially linear property/temperature profile, such that physical properties such as strength are substantially maintained even at temperatures of 250° C. and above.
Tue, 17 Feb 2015 08:00:00 ESTMethods of forming scroll compressor components are provided. The methods include forming at least one component of a scroll member from a powder metallurgy technique and joining the component with another distinct component via a sinter-brazing process. For example, a baseplate having a spiral scroll involute is joined to a hub via a joint interface having brazing material to form a braze joint with superior quality. At least one component is formed from a powder metal material including carbon and at least one species that reacts with or binds carbon to prevent migration during brazing of the sinter-brazing heat process. Optionally, during the powder metallurgy process, an alloy with a lower concentration of carbon is selected, which may be incorporated into a crystal structure with the species that prevents carbon migration.
Tue, 10 Feb 2015 08:00:00 ESTCam lobe packs and methods of producing the same. The method uses a tool made up of an insert disposed within a sleeve such that both are responsive to a dynamic magnetic compaction (DMC) pressure source. The insert defines a substantially axisymmetric exterior surface and a cam lobe-shaped interior surface that can receive a compactable material such that upon DMC, the material is formed into the shape of the cam lobe. The sleeve is disposed about the insert and defines a substantially axisymmetric exterior surface such that an axisymmetric compaction imparted to the sleeve by the DMC pressure source forms the desired shaped cam lobe. The tool is configured such that individual tool members corresponding to one or more of the cam lobes can be axially aligned so that an aggregate interior surface is formed that defines an exterior surface profile of a camshaft being formed.
Tue, 10 Feb 2015 08:00:00 ESTA method for preparing an implant having a porous metal component. A loose powder mixture including a biocompatible metal powder and a spacing agent is prepared and compressed onto a metal base. After being compressed, the spacing agent is removed, thereby forming a compact including a porous metal structure pressed on the metal base. The compact is sintered, forming a subassembly, which is aligned with a metal substrate portion of an implant. A metallurgical bonding process, such as diffusion bonding, is performed at the interface of the subassembly and the metal substrate to form an implant having a porous metal component.
Tue, 10 Feb 2015 08:00:00 ESTOne aspect relates to a medical implant, for example, implantable stimulation electrode, having a tight substrate and a porous contact region. One aspect also relates to a lead of a cardiac pacemaker having an implantable stimulation electrode and to a method for manufacturing a medical implant, for example, an implantable stimulation electrode. A medical implant according to one aspect is characterized in that the implant includes a sintered body with graduated porosity.