3593 results about "Powder metallurgy" patented technology

Methods and compositions relating to powder metallurgy in which an amorphous-titanium-based metal glass alloy is compressed above its glass transition temperature Tg with a titanium alloy powder which is a solid at the compression temperature, to produce a compact with a relative density of at least 98%.

The invention discloses a preparation method of a graphene reinforced metal-matrix composite, which comprises the following steps of: firstly, dispersing the graphene oxide on the surface of the flaky metal powder; and then obtaining the graphene/metal composite powder through the reducing treatment; and at last, carrying out densification treatment by adopting a powder metallurgic technology to obtain the compact graphene reinforced metal-matrix composite. The flaky metal powder has the plane two-dimensional form, is inclined to the directional piling to form a laminated structure, and is helpful for inducing the graphene orientation distribution and giving play to the reinforcing effect. The preparation method disclosed by the invention is simple and feasible, is capable of regulating the graphene content and is suitable for preparing the massive composite.

Disclosed are interfacially modified particulate and polymer composite material for use in injection molding processes, such as metal injection molding and additive process such as 3D printing. The composite material is uniquely adapted for powder metallurgy processes. Improved products are provided under process conditions through surface modified powders that are produced by extrusion, injection molding, additive processes such as 3D printing, Press and Sinter, or rapid prototyping.

Disclosed herein are titanium-tungsten alloys and composites wherein the tungsten comprises 0.5% to 40% by weight of the alloy. Also disclosed is a method of making such alloys and composites using powders of tungsten less then 3 μm in size, such as 1 μm or less. Also disclosed is a method of making the titanium alloy by powder metallurgy, and products made from such alloys or billets that may be cast, forged, or extruded. These methods of production can be used to make titanium alloys comprising other slow-diffusing beta stabilizers, such as but not limited to V, Nb, Mo, and Ta.

The invention discloses a preparation method of a copper-plated graphene reinforced metal-based composite. The preparation method comprises the following steps: firstly, chemically plating the surfaces of oxidized graphene powder with copper to obtain copper-plated graphene powder; ball-grinding and mixing the copper-plated graphene powder and metal powder to obtain copper-plated graphene/metal mixed powder; and performing warm-pressing forming to the copper-plated graphene/metal mixed powder by adopting powder metallurgy warm-pressing technology, sintering, and performing composite processing and forming by adopting extrusion, forging, rolling and other technologies. The copper-plated graphene powder is adopted as a reinforcing body, the preparation method is simple, the cost is low, the designability is strong, and the copper-plated graphene reinforced metal-based composite which is good in interface binding, high in compactness and good in mechanical performance and thermophysical performance can be obtained.

The invention discloses a method for preparing sintered NdFeB with low dysprosium (Dy) content and high performance; the method comprises the following steps of: sputtering and plating the Dy element on the surface of jet mill powder by using the powder plate technology based on magnetron sputtering on the basis of preparing NdFeB powder, and then sufficiently dispersing the Dy element to micron-sized NdFeB crystal particles by dispersing the Dy element at high temperature in the sintering and tempering process, thereby achieving the effect of improving magnetic performance of the sintered NdFeB. Compared with the introduction of the Dy element in the proportioning process of the prior art, the method disclosed by the invention has the advantages: the low dysprosium content and high performance is limited in the nano-size by adopting the physical gas-phase deposition, the consumption quantity of the Dy element during the production process is controlled effectively and the preparationof sintered NdFeB with low dysprosium content and high performance is realized. Compared with the sintered NdFeB of the same components prepared by the traditional casting and powder metallurgy process, both the intrinsic coercivity and the maximum magnetic energy product of the sintered NdFeB rare-earth permanent magnetic material obtained according to the invention are improved obviously; compared with the sintered NdFeB with the same performance prepared by the traditional casting and powder metallurgy process, the dosage of the dysprosium element is reduced remarkably. The method can be widely applicable to producing and manufacturing sintered NdFeB with high performance.

The invention discloses a porous graphene/polymer composite structure, and a preparation method and application thereof. The composite structure mainly comprises a compound formed by porous graphene and more than one polymer and/or polymer monomer. The preparation method comprises the following steps of: compounding polymers and/or polymer monomers with porous graphene to form a target product, wherein the compounding manner comprises single-screw/double-screw fusing processing, injection molding, blow molding, melt spinning, solution spinning, electrostatic spinning, electrostatic spraying, powder metallurgy, liquid mixing or high speed mechanical stirring dispersion. The invention is simple in process, wide in source of raw materials, easy to implement in large scale, low in cost, safe, environment-friendly and free from toxic and harmful wastes, and the product obtained is excellent in thermal and electric properties, and has wide application prospect in the fields of heat conduction, radiation, electric conduction, anti-static electricity, electromagnetic shielding and the like.

A weight member for a golf club head is made of a WMoNi alloy by powder metallurgy or a precision casting process. The WMoNi alloy includes tungsten 1-35 wt %, molybdenum 4-55 wt %, and nickel 25-95 wt %, and has a specific gravity ranging between 8.6 and 13.3. Molybdenum increases the density of the weight member and improves the rust-resisting property of the weight member. The tungsten, molybdenum, and nickel provide a uniform metallographic phase. Uniformity of polishing of the weight member is thus improved.

A focused ultrasound transducer includes a first ultrasonic emitter and at least one metallic ultrasonic lens acoustically coupled thereto. The emitter generates ultrasonic energy that propagates along a beam path projecting therefrom. The at least one metallic ultrasonic lens is positioned at least partially in the beam path so that it can direct (e.g., focus, defocus, and/or collimate) in at least one direction (or along at least one plane) at least some of the ultrasonic energy propagating from the emitter. The metallic lens may be formed by extrusion, by molding (e.g., diecast molding or thermoforming), or by sintering (e.g., powder metallurgy). The metallic lens also advantageously functions as a heat sink, improving thermal performance of the ultrasound transducer.

A method of producing a high-density article is presented comprising selecting one or more primary tungsten-containing constituents with densities greater than 10.0 g/cc and one or more secondary constituents with densities less than 10.0 g/cc, co-milling the mixture of constituents in a high-energy mill to obtain mechanical alloying effects, then processing the resulting powder product by conventional powder metallurgy to produce an article with bulk density greater than 9.0 g/cc.

A method of preparing a biaxially textured alloy article comprises the steps of preparing a mixture comprising Ni powder and at least one powder selected from the group consisting of Cr, W, V, Mo, Cu, Al, Ce, YSZ, Y, Rare Earths, (RE), MgO, CeO2, and Y2O3; compacting the mixture, followed by heat treating and rapidly recrystallizing to produce a biaxial texture on the article. In some embodiments the alloy article further comprises electromagnetic or electro-optical devices and possesses superconducting properties.

The invention relates to a device and method for preparing spherical titanium powder and titanium alloy powder through gas atomization, which belongs to the field of powder metallurgy industry. The device comprises a vacuum chamber, a continuous feeder for titanium or titanium alloy wires/rods is arranged outside the vacuum chamber, a dynamic sealing device is arranged at the top of the vacuum chamber, a metal straightening device is arranged inside the vacuum chamber, an atomizing chamber is arranged below the vacuum chamber, a gas atomization nozzle is installed between the atomizing chamber and the vacuum chamber, the center hole of the nozzle is internally provided with a wire/rod guiding device, a high-frequency smelting coil is installed below the nozzle, wherein the dynamic sealing device, the straightening device, the guiding device and the high-frequency smelting coil are installed on the same axis; a heat dissipation cover is installed inside the atomizing chamber, a protective cover is arranged at the top of the heat dissipation cover, and the centers of the heat dissipation cover and protective cover and the center of the high-frequency smelting coil are on the same axis; a powder collecting pot is arranged below the atomizing chamber. By means of controlling the diameters of the wires, the atomizing gas pressure and the power of a high-frequency power supply, titanium and titanium alloy powder with different particle sizes and particle size distributions can be obtained.

The sputter target includes a tantalum body having tantalum grains formed from consolidating tantalum powder and a sputter face. The sputter face has an atom transport direction for transporting tantalum atoms away from the sputter face for coating a substrate. The tantalum grains have at least a 40 percent (222) direction orientation ratio and less than a 15 percent (110) direction orientation ratio in an atom transport direction away from the sputter face for increasing sputtering uniformity, the tantalum body being free of (200)–(222) direction banding detectable by Electron Back-Scattering Diffraction and wherein the sputter target has a purity of at least 99.99 (%) percent.

PCT No. PCT/EP95/03347 Sec. 371 Date Nov. 19, 1997 Sec. 102(e) Date Nov. 19, 1997 PCT Filed Aug. 23, 1995 PCT Pub. No. WO96/20902 PCT Pub. Date Jul. 11, 1996A ceramic formed body containing a) 5 to 70 vol % of at least on intermetallic aluminide phase which additionally may contain aluminum or/and aluminum alloy, and b) 30 to 95 vol % of one or more ceramic phases which form a solid interconnecting skeleton and wherein the intermetallic phase or phases consist of predominantly interconnected areas with average sizes of 0.1 to 10 mu m, is obtained by sintering, in a non-oxidizing atmosphere, of a powder metallurgically green body which consists of a mixture of finely dispersed powder of aluminum, one or more ceramic substances and maybe further metals such that the mixture contains at least one oxide ceramic or/and metallic powder which, during sintering, reacts with aluminum thereby forming an aluminide and maybe Al2O3.

The invention discloses a preparation method for a carbon nanomaterial enhanced aluminum base composite material, which is similar to a powder metallurgy method, i.e. an aluminum material cladding powder processing and forming method. The preparation method is mainly used for solving the problem of precise mould requirement in the powder metallurgy process. The method is realized by the following steps of: 1) carrying out annealing treatment to pure aluminum or aluminum alloy material, carrying out alkali liquor cleaning and clean water cleaning to the surface of the pure aluminum or aluminum alloy material, and airing or drying after cleaning; 2) fully mixing and evenly stirring the pure aluminum or aluminum alloy powder with carbon nanomaterial at a certain ratio, i.e. at the mass fraction of the carbon nanomaterial of 0.1-8%; 3) cladding mixed powder by the pure aluminum or aluminum alloy material processed in step 1, compacting, sealing, and pressing into a precast block by a press; and 4) rolling the precast block obtained in step 3 into a final finished product. The preparation method for the carbon nanomaterial enhanced aluminum base composite material, which is disclosed by the invention, has the advantages of low cost, short flow, simpleness in operation and easiness in realizing industrialization.

The invention provides a powder metallurgy preparation method for a nano-particle reinforced ultra-fine grain metal-matrix composite. According to the method, a metal-matrix grain refining process and a nano-particle dispersing process are carried out in steps. The method comprises the steps that firstly, micro-nano flaky metal-matrix powder is prepared in advance; nano-particles and the flaky metal-matrix powder are stirred and mixed in a stirrer at the high speed under protective atmosphere, and by means of high shear force and pressure generated between stirring blades and a tank body, the nano-particles are uniformly dispersed to the surface of the micro-nano flaky metal-matrix powder; through short-time mechanical ball-milling treatment, the nano metal particles are embedded into the micro-nano flaky metal-matrix powder, so that composite powder of nano-particle reinforced metal is obtained; and compression moulding, sintering and compacting treatment are conducted, so that the ultra-fine grain metal-matrix composite with the nano-particles uniformly dispersed is obtained. By means of the powder metallurgy preparation method, time and energy are saved; cost is low; the application range is wide; and the prepared material is high in comprehensive mechanical performance and has large-scale application potential.

A biaxially textured alloy article comprises Ni powder and at least one powder selected from the group consisting of Cr, W, V, Mo, Cu, Al, Ce, YSZ, Y, Rare Earths, (RE), MgO, CeO2, and Y2O3; compacted and heat treated, then rapidly recrystallized to produce a biaxial texture on the article. In some embodiments the alloy article further comprises electromagnetic or electro-optical devices and possesses superconducting properties.

The invention relates to a plasma rotary electrode powder milling set and a process thereof, relating to the technical field of powder metallurgy. The milling set comprises a rotating feeding mechanism, a vacuum furnace, a vacuum unit, a plasma gun device and an electrical source. The rotating feeding mechanism is arranged at the exterior of one side of the vacuum furnace; the plasma gun device is arranged at the interior of the other side of the vacuum furnace; the vacuum unit is communicated with the vacuum furnace through a ventilation pipe, wherein, the vacuum furnace body has a double-decker sandwich structure, and cooling circulating water is injected into the sandwich structure; a receiving mechanism is arranged at the bottom part of the vacuum furnace, wherein, the receiving mechanism comprises two cut-off valves connected in series. The process includes the following steps: metal is processed into electrode bars; low-voltage heavy current is applied to the electrode bars to melt the electrode bars in a highly vacuumized melting chamber through the high temperature produced by the cathode arc of the plasma gun, and to eject the molten metal instantly by the strong centrifugal force produced through the high-speed rotation of the electrode bars to produce fine metal powders. The invention is characterized in that the yield of perfect spherical metal powders is up to 97 percent, and the powders are free from the contamination of any microelement.

The planetary gear train includes a first sun gear driven by the motor, a first ring gear, a first carrier, and a plurality of first planetary gears arranged at one side of the first carrier and meshing with the first sun gear and the first ring gear. The first sun gear, first planetary gears and first ring gear are helical gears so that meshing surface is increased. Helical teeth formed on an inner surface of the first ring gear mesh with the helical teeth of the first planetary gears. Therefore, the operation is stable and the noise is low. The planetary gears are made of plastic to further decrease the noise. The first ring gear is made by sintered powder metallurgy.

The invention provides a powder metallurgy preparation method of a carbon nanotube reinforced aluminum alloy composite material. The method comprises the following steps: pre-preparing micro-nano flake powder of an alloying component, subsequently ball-milling the powder with a carbon nanotube and spherical pure aluminum powder to prepare flake composite powder, and further performing densifying, sintering, thermal deformation processing and thermal treatment to achieve alloying so as to finally obtain the carbon nanotube reinforced aluminum alloy composite material. Uniform compounding of the matrix aluminum powder, the carbon nanotube and the alloying component can be achieved through limited ball-milling, and meanwhile dangerous elements or uneasy grinding elements such as magnesium and silicon which are high in activity and likely to combust and explode are avoided by adopting the stable and easily ground pre-alloying aluminum powder, so that the security and the reliability are improved; in addition, because of large interlayer boundary and small layer thickness distance, the flake structure is beneficial for uniformly dispersing the alloying component and forming refined dispersed separated phase. The method is beneficial for bringing the effects of composite reinforcement of carbon nanotubes and alloy reinforcement into play to the maximum extent, is energy-saving and time-saving, and is safe and feasible.

The invention aims at disclosing a ceramics material with an amorphous/nanocrystalline structure and a preparation method thereof. The method solves the problems that in the existing preparation process of ceramics composite material, the sintering temperature is high, the sintering time is long and the performance of the product is weak. The ceramics material of the invention is manufactured by subjecting a main phase ceramics powder and an additive phase ceramics powder to powder metallurgy technique. The method has the following steps: 1. the raw material of ceramics powder is granulated into ceramics composite powder; 2. heat treatment is carried out on the ceramics composite powder; 3. after the heat treatment, shaping and heat insulation sintering are carried out on the obtained composite powder, thus finally obtaining the ceramics material. In the invention, the sintering temperature in the preparation process of ceramics materials is lowered, the sintering time is shortened, and in particular, the internal arrangement of the amorphous/nanocrystalline structure in the ceramics materials improves strength, toughness, hardness of the ceramics materials of the ceramics materials, enhances high temperature resistance, wear resistance, corrosion resistance and chemical stability thereof.

The invention provides a graphene modified high-heat-conductivity aluminum-based composite material and a powder metallurgy preparation method thereof. The material comprises reinforced grains and an aluminum substrate, wherein the composite boundary of the reinforced grains and the aluminum substrate contains high-heat-conductivity graphene nanosheets. The method comprises the following steps: (1) soaking the reinforced grains with a strong acid solution, subsequently washing with deionized water till being neutral, drying, and removing the surface impurities, thereby obtaining activated reinforced grains; (2) adding the activated reinforced grains into a graphene dispersion liquid, mechanically stirring or performing ultrasonic dispersion, and wrapping the graphene nanosheets on the surface, thereby preparing the graphene modified reinforced grains; and (3) mixing the graphene modified reinforced grains with the aluminum substrate powder, pressing into blanks, and sintering, thereby preparing the graphene modified high-heat-conductivity aluminum-based composite material. The composite material provided by the invention is good in chemical stability, high in thermal conductivity and can be used as a heat management material of a large-power semiconductor device.

The invention discloses a metallurgic powder formulation and a process thereof. The metallurgic powder comprises graphite powder 0.05% to 5%, zinc stearate 0.08% to 7%, copper powder 0.1% to 10%, and iron powder in balance. The process comprises the following steps of: mixing, pressing, sintering, soaking in oil, finishing, treating by steaming, and deburring. Compared with prior art, the metallurgic powder has low cost and reliable product performance by adopting the formulation: graphite powder 0.05% to 5%, zinc stearate 0.08% to 7%, copper powder 0.1% to 10%, and iron powder in balance. Moreover, the process is properly optimized and simplified, and the steam treatment step can form a dense protection film on the product surface to improve the rustproof performance.

The invention belongs to a process for preparing and processing powder material by taking plasma as a heat source, in particular to a process and an apparatus of metal titanium powder material for powder metallurgy, plasma spray, injection forming, gel injection molding and the like. The invention has the advantages that: the adoption of the high temperature spheroidization and rapid condensation special spheroidization technique can improve the sphericity and purity of titanium powder, and both a reactor and the titanium powder spheroidization process are cooled with circulating water, thereby ensuring the sealing performance of equipment, also reducing the use of inert gases, effectively reducing costs, improving the production efficiency and guaranteeing the purity of spherical titanium powder.

The invention discloses a graphene reinforced lead-free solder, which comprises, by weight parts, graphene and lead-free solder base body of the ratio of 0.75-1.75:50000. The preparation method includes: by means of process of powder metallurgy, disposing the graphene into absolute ethyl alcohol according to proportion, vibrating ultrasonically, milling and drying the absolute ethyl alcohol with the graphene, mixing and stirring the absolute ethyl alcohol and the lead-free solder base body, pressing the same into a blank, sintering the blank at the temperature of 175 DEG C under the protective atmosphere of high-purity argon, extruding the same into a bar with the diameter of 6mm, and preparing the graphene reinforced lead-free solder. The graphene reinforced lead-free solder can meet the requirements of environmental protection and reliable welding, substitutes for conventional stannum-lead solder, has higher and more reliable mechanical performance than lead-free solder in the prior art, can be used as connection materials for oversized integrated circuits and is a composite material according with development trends of the modern electronic industry.

The invention provides a powder metallurgy preparation method of a carbon nanotube reinforced aluminium alloy composite material. According to the powder metallurgy preparation method, slurry mixing method or in-suit growth method is adopted for pre-preparation of carbon nanotube/pure aluminium flaky composite powder; the carbon nanotube/pure aluminium flaky composite powder is mixed with aluminium alloy powder according to a certain ratio; an obtained mixture is subjected to densifying, sintering, thermal deformation processing and heat treatment so as to obtain the carbon nanotube reinforced aluminium alloy composite material. The powder metallurgy preparation method is capable of solving problems that dispersion of carbon nanotube in aluminium alloy powder is difficult to realize, and hydrolysis is easily caused, so that it is beneficial for preparation of the carbon nanotube/aluminium alloy composite material with high strength, high modulus, and high plasticity.

The invention provides powder metallurgy titanium alloy and a preparation method thereof. The powder metallurgy titanium alloy comprises the following components in percentage by mass: 2 to 7 percent of Al, 2 to 8 percent of Mo, 2 to 6 percent of V, 2 to 10 percent of Ag, 0.1 to 3.0 percent of LaB6 and the balance of titanium and inevitable impurities. The method comprises the following steps of: weighing titanium powder, aluminum powder, molybdenum powder, aluminum-vanadium intermediate alloy powder, silver powder and lanthanum hexaboride powder with certain particle size according to the mass percentage of the components; uniformly mixing the powder by a mixing method; preparing a green compact with a certain shape by a compression molding process; placing the green compact in a vacuum hot pressing sintering furnace to sinter; and cooling the green compact along with the furnace to obtain silver and titanium boride particle-containing powder metallurgy titanium alloy. The technological process is simple; the silver powder is added during the mixing of the materials to improve the molding property of the green compact; the lanthanum hexaboride powder is added to perform reaction in situ so as to generate titanium boride dispersion enhanced matrix alloy; the compactness of the sinter compact is further improved by hot pressing sintering; and thus the novel powder metallurgy titanium alloy with high compactness and high strength is obtained.

The invention discloses a powder metallurgy transmission gear which is prepared from the raw materials containing the following components in percentage by weight: 1-5% of nickel, 1-3% of copper, 0.5-2% of molybdenum, 0.5-0.9% of graphite, 0.6-0.9% of lubricant, 0.3-0.5% of cutting agent and the balance of ferrum. The invention also discloses a manufacturing method of the powder metallurgy transmission gear. The powder metallurgy transmission gear has good self-lubricating performance, can meet the requirement on different parts with various specifications of a transmission gear of an automatic overrun clutch, and can greatly reduce the manufacturing cost and increase the utilization ratio of materials and the production rate.

The invention provides a copper based powder metallurgy high speed brake lining, which comprises a steel backing, a brake block, a framework, a spring washer and a swollen tail block. In the course of braking, the brake lining has smaller abrasion loss and can effectively prevent the edge dropping, angle dropping and camber wear of the brake block. The brake block uses copper based powder metallurgy friction material; copper powder, iron powder, tin powder, chromium powder, titanium powder, nickel powder, bismuth meal, graphite, boron nitride, aluminum oxide, silicon dioxide, zirconite and the like are well blended according to the proportion, stamped and sintered on the framework after cold pressing. The copper based powder metallurgy high speed brake lining has the characteristics of high mechanical strength, good thermal conduction, good thermal stability, strong heat-resistant fade performance, long service life, small abrasion on a retarding disc and stable friction performance and the like, and can effectively control very high way trains with 200-300km/h per hour.

The invention discloses a composite silicone rein-ferrite-coating soft magnetic powder core and a preparation method thereof, and belongs to the metallurgical industry of magnetic functional material and powder. The soft magnetic powder core is formed by pressing and forming composite magnetic particles, wherein each composite magnetic particle comprises a soft magnetic metal particle and a composite insulation film, and each composite insulation film is coated on the surface of each soft magnetic metal particle. The preparation method of the soft magnetic powder core comprises the following steps of surface modification and coupling treatment of the soft magnetic metal particles, forming of the composite insulation coating around each soft magnetic metal particle, pressing and forming, and high-temperature heat treatment at 300 DEG C to 650 DEG C. Compared with the prior art, the soft magnetic powder core and the preparation method have the advantages that the adopted organic resin can resist the high temperature of 600 DEG C; since the soft magnetic ferrite power is added into the composite coating agent, the damage of the insulation layer to the magnetic performance of a substrate is reduced; and the magnetic conductivity is high, the density is high, the rapture strength is high, the loss is low, and the industrial production is easy.