401 results about "Powder injection molding" patented technology

This invention relates to processes and systems of rapid prototyping and production. Its features includes flexible material deposition along tangential directions of surfaces of a part to be made, thereby eliminating stair-shape surface due to uniform horizontal layer deposition, increasing width of material deposition to increase build up rate, applying the principles of traditional forming/joining processes, such as casting, fusion welding, plastic extrusion and injection molding in the fabrication process so that various industrial materials can be processed, applying comparatively low cost heating sources, such as induction heating and arc-heating. Additional features include varying width and size of material deposition in accordance with geometry to be formed and applying a differential molding means for improved shape formation and surface finishing.

Disclosed are a powder injection molding feedstock preparing method and a powder injection molding method. The powder injection molding feedstock preparing method includes: stirring and heating 80% to 94%, preferably 85% to 94%, by percent, of forming powder in an internal mixer, adding 6% to 20%, preferably 6% to 15%, by percent, of binder component when the forming powder is heated to 180 DEG C to 200 DEG C, and continuing stirring for 60min to 120min according to the mixing temperature 175 DEG C to 195 DEG C, preferably at the mixer speed 10rpm to 30rpm, thus obtaining evenly mixed feedstock. The powder injection molding method includes performing injection molding and degreasing sintering with the feedstock. The powder injection molding feedstock preparing method and the powder injection molding method have the advantages that degreasing efficiency is high, the process is simple and easy to control, blank quality is good and the methods are sanitary and environment friendly.

The invention discloses a preparation method of a superfine ceramic powder injection molding mixture, which belongs to the technical field of ceramic injection molding. The preparation method of the superfine ceramic powder injection molding mixture comprises the steps: carrying out ultrasonic dispersion or high-speed ball grinding dispersion and surface modification of submicron or nanometer level ceramic powder in surface active agent solution; evenly mixing the surface modified powder with a non water-solubility organic binding agent, a water-solubility organic binding agent and other additives in a mixer according to a specific order; injecting and molding obtained injecting and mixing material on an injection molding machine to obtain a blank body; and quickly degreasing the blank body by water in water and ethanol mixing solution with a certain proportion under a certain degreasing temperature system. The obtained water-degreased injection material has even mixture, high strength of a green blank and good fluidity. The degreasing method has high degreasing speed and good blank shape maintaining performance and avoids the defects of cracking, bubbling, and the like.

The invention relates to a method to prepare high volume fraction silicon carbide particle to enhance copper matrix composite, belonging to the field of metal matrix composites. The technique is that: proper blended particle size distributed SiC powder is mixed with polymer component paraffin base binder in a volume proportion of 57-68% load in sudarpress, fine blended feedstock is obtained; injection mold in powder injection molding machine in the injection temperature of 150-175 DEG C and the injection pressure of 75-125MPa to obtain a required billet, the billet is degreased in a solution-doff + thermal-doff process, and is first sintered in 600-1120 DEG C to obtain pre-molded billet of porous SiC. Infiltrate copper alloy to the porous SiC pre-molded billet in the temperature of 1400-1450 DEG C in vacuum via non-pressure infiltration. So the high volume fraction SiC_p/Cu composite is obtained. The invention can prepare intricate shaped thin wall SiC_p/Cu composite parts, enhance the content of phase as high as 57-67% volume fraction, the density of the composite is high, the microstructure is evenly distributed, and the invention has the advantages of high utilization rate of material, high productivity, and low production cost.

The invention relates to the technical field of powder injection molding and particularly discloses a method for preparing a special-shaped complex part through a powder injection molding technology. The method includes the steps of mixing and pelleting, injection molding, and degreasing and sintering. In the injection molding step, a green body of the special-shaped complex part and a green body of a profile-followed supporting part corresponding to the special-shaped complex part are prepared; in the degreasing and sintering step, the special-shaped complex part is placed on the profile-followed supporting part corresponding to the special-shaped complex part for degreasing and sintering. According to the method, the problems of deformation, collapse and even breakage in the degreasing and sintering process of the special-shaped complex part can be well solved, the problem that the special-shaped complex part cannot be sintered through a traditional method is effectively solved, and the complexity of the powder injection molding field is lowered.

The invention relates to a plasma atomization method and apparatus for preparing spherical pure titanium or titanium alloy powder, and belongs to the technical field of preparation of titanium or titanium alloy powder. The plasma atomization method for preparing pure titanium or titanium alloy powder comprises the following steps of (1) preparing a titanium wire or titanium alloy wire with the diameter ranging from 3 millimeters to 20 millimeters, (2) using a plasma torch to fuse and atomize the titanium wire or titanium alloy wire in an atomization bin with an argon atmosphere to obtain atomized pure titanium particles or titanium alloy particles, and (3) feeding argon flow with the temperature ranging from 300 DEG C to 500 DEG C into the atomization bin, carrying out laminar cooling on the atomized pure titanium particles or titanium alloy particles to obtain pure titanium or titanium alloy powder. The obtained powder is good in degree of sphericity and low in the content of satellite balls, and has the advantages of being uniform in size distribution, high in purity and degree of sphericity, good in liquidity, low in oxygen content and impurity content, free of bond or cluster phenomenon and the like. The prepared titanium powder can be widely applied to the forming manners such as metal additive manufacturing, powder injection moulding and hot isostatic pressing for manufacturing parts with high precision.

The invention relates to a metal powder injection molding inductor and a processing method thereof, which aim at solving the problems of poor electrical performance consistence and high production cost and the like of the traditional power inductors; the method comprises the following steps of: firstly installing a magnetism-conducting core in a hollow cavity of a coil body of an enameled wire, later installing the coil with the magnetism-conducting core in an injection mold; then taking the composite material which mainly comprises ferromagnetic metal powder as flowing feeding and injecting the composite material into the injection mold until the cavity of the injection mold is completely filled; and finally obtaining a patch type inductor or a plug-in inductor which is molded by the injection of metal powder after curing and demolding. The inductor product has consistent appearance size and electrical performance, can select magnetism-conducting cores of various shapes and material qualities to meet different inductance performance demands, and can also greatly improves the production efficiency; in addition, the placement direction of the internal coil of the product can be designed freely and the whole product is consistent with the development direction of elements towards shortness and thinness.

A method for producing glass or glass ceramic articles by powder injection molding of glass powder includes mixing together, in a continuous mixing process, ingredients to form a mixture comprising a glass powder and a binder, where the ingredients include a glass powder in a relative amount sufficient to equal at least 50% by volume of the resulting mixture and a binder comprising a thermoplastic polymer, desirably a thermoplastic elastomer, and a wax; forming the mixture into a formed structure; and de-binding and sintering the formed structure. The method desirably involves mixing via a high intensity mixing process, desirably by mixing in a twin-screw extruder. The forming process may include pelletizing the mixture and injection molding the pelletized mixture to form the formed structure. The ingredients of the mixture desirably comprise a glass powder in a relative amount sufficient to equal at least 70% by volume of the resulting mixture. The glass powder desirably includes at least some glass particles having irregular shapes.

The invention provides a novel method for preparing a molybdenum-copper component and belongs to the technical field of the molybdenum-copper forming. The method adopts the powder injection molding technology to prepare a molybdenum-copper injection blank, and then prepares the molybdenum-copper component by the steps of degreasing, presintering, sintering and the like. The sintered product is subjected to the heat treatment to obtain the molybdenum-copper component finished product with excellent performance and high size precision. The invention has the advantages of high utilization rate of the materials, no need of subsequent processing and capacity of batch production of the molybdenum-copper component product with high shape complexity and excellent combination property.

The invention relates to the field of metal powder injection molding, in particular to an adhesive and a method for preparing metal powder injection molding feedstock from the same. The adhesive comprises olefinic thermoplastic elastomers, carnauba wax, commercial paraffin, high-density polyethylene, polypropylene and stearic acid; and the raw materials are mixed in a ratio, extruded, cooled, crushed, and packaged in vacuum to form the qualified feedstock. The metal powder injection molding feedstock prepared from the adhesive is low in manufacturing cost; in the molding process, a liquid phase and a solid phase are hardly separated, and an injection blank is uniform in density; the debonding efficiency is high; and a sintered blank is high in density. The invention overcomes the defect that the traditional metal powder injection molding feedstock is high in cost, widens the application range, and creates greater economic and social benefits.

The invention provides a water-soluble salt core type metal powder injection molding technology and relates to the technical field of metal powder injection molding. The technology comprises the steps of mixing, water-soluble salt core preparing, mold core inlaying and mold clamping, injection molding, core-removing drying, degreasing and sintering. According to the technology, a fused and poured water-soluble salt core forms a part cavity and can be dissolved and removed through clean tap water at indoor temperature, the removal time is short, the safety is high, the environmental friendliness is high, and the potential problems of production insecurity, environmental pollution and strength reduction of green bodies caused by polymer core removal can be effectively solved. Part products manufactured through the technology are uniform in internal structure, high in compactness, high in surface smoothness, high in dimensional precision and stable in quality, a great deal of time and cost are saved for volume production of small and precision parts provided with closed or complicated cavity structures and made of various metal materials, the economic benefit is good, and the application prospect is good.

The invention provides a binding agent for powder injection moulding, a preparation method of the binding agent and an application method of the binding agent. The binding agent is mainly prepared from the following components in percentage by mass: 65 to 75 percent of polyformaldehyde, 4 to 9 percent of dioctyl phthalate, 6 to 13 percent of polyethylene, 1 to 3 percent of acrylate copolymer, 3 to 8 percent of polyacrylamide, 1.5 to 4 percent of paraffin, 2 to 6 percent of microcrystalline wax and 0.5 to 2 percent of ethylene vinyl acetate copolymer. In the binding agent provided by the invention, multiple types of components are combined through scientific compatibility, so that the compatibility between metal powder or ceramic powder and the binding agent can be obviously improved, and meanwhile, the binding agent can be quickly removed in a degreasing process without causing the defects of bubbling and cracking of a green body, so as to guarantee the quality of the green body.

The invention relates to the technical field of powder metallurgy and particularly relates to a ceramic part and a production method thereof. The production method comprises (1) mixing granulation: putting ceramic powder into a mixer, heating the ceramic powder, adding a binder into the ceramic powder, carrying out mixing, and carrying out granulation through an extruder to obtain feed, (2) injection molding: placing the feed in an injection molding machine and carrying out injection molding to obtain an injected blank, (3) degreasing: placing the injected blank into an air furnace, carrying out hot degreasing, carrying out heating pre-sintering, carrying out furnace cooling and taking out a blank, and (4) sintering: putting the blank in a sintering furnace, carrying out sintering, and carrying out grinding and polishing to obtain a ceramic part. Through powder injection molding process and final degreasing and high temperature sintering, a fine ceramic part having a complex shape is obtained, the product has high compactness and good uniformity and is obtained by one step molding, the operation and control are simple, product quality is stable, production efficiency is high, a production cost is low and large-scale industrial production is realized.

Metal-metal or metal-ceramic/carbide composite materials are fabricated by combination of powder injection molding and infiltration. This is achieved by first forming a composite system having a matrix component and an infiltrant layer. The matrix component is formed from a metal or ceramic/carbide powder, that is of a higher melting point, admixed with a first binder. The infiltrant layer is formed from a metal powder, that is of a lower melting point, admixed with a second binder. The first and second binders are subsequently removed from the composite system during a debinding process. The composite system is then heated in a sintering furnace to coalesce the matrix component into a matrix phase having a network of interconnected pores, and to effect infiltration of the infiltrant layer into these pores to form the composite material of the present invention.

The invention relates to an injection molding method and injection molding equipment for a single polymer composite product, and belongs to the technical field of molding processing of polymer composite materials. The injection molding method comprises the following steps of: plastifying and melting a matrix, preparing a prefabricated piece from a reinforcing material, fixing the prefabricated piece in a die cavity, closing a die, injecting the molten matrix into the die cavity to soak the prefabricated piece, maintaining the pressure and cooling, and thus obtaining the single polymer composite product, wherein the matrix and the reinforcing material are the same polymer. The method has the advantages of high product strength, material recycle, complex product shape, short molding period, batch production, high production efficiency and the like. The injection molding equipment consists of an injection molding machine and the die. By adopting the conventional injection molding machine, the die has the advantage that only one fixed mechanism and one reasonably designed pouring system are required to be added on the molding component compared with the conventional design; and the equipment is simple in structure and easy to operate, and can be used for preparing the single polymer composite product by injection molding.

The invention provides a method for preparing a high-density special-shaped pure tungsten product through low-temperature sintering, and belongs to the technical field of powder injection molding. The method comprises the technological processes that an air flow mill is adopted for carrying out dispersing and staging treatment on commercially available high-purity tungsten powder, the treated powder and a bonding agent are evenly mixed for mixing, and even feed is obtained; the feed is subjected to injection molding to form a blank in a certain shape; and the formed blank is subjected to solvent degreasing and hot degreasing and then is sintered, and the tungsten product is obtained. Powder is subjected to dispersing and staging treatment through the air flow mill under the protective atmosphere, the powder is driven by gas to collide with each other and can be treated on a large scale, and no impurity is introduced; the particle size distribution of the treated powder becomes narrow, and the shape of particles becomes regular and is similar to a spherical shape; and loose-fitting tap density is increased, the loading amount of the injection-molded powder is correspondingly improved to 55%-70%, and the density of the pure tungsten product manufactured after sintering of the hydrogen atmosphere of 1,900 DEG C is higher than 96%.

The invention relates to a preparation method of a polymer foam material. The preparation method comprises the following steps: mixing and extruding polymer particles through an extruder or injection-molding through an injection molding machine, to obtain a polymer sample; and placing the obtained polymer sample into a supercritical fluid for swelling and penetration, and then performing fast pressure relief, to obtain the polymer foam material. According to the method, before the swelling and penetration of a supercritical fluid to a polymer, mixing and extrusion through the extruder or injection molding of the injection molding machine are/is performed, and the polymer sample with a shish-kebab structure is prepared through adjusting parameters during extrusion or injection molding. The method is simple in process, easy in industrialization, and applicable to the majority of crystallization type polymers, as well as good in foaming effect.

The invention relates to a binder which comprises the following components according to weight percentage: 15 percent to 25 percent of chlorinated polyethylene, 15 percent to 25 percent of polyformaldehyde, 3 percent to 10 percent of rubber, 20 percent to 30 percent of petroleum wax, 15 percent to 25 percent of Brazil wax (palm wax), 1 percent to 5 percent of stearic acid and 1 percent to 5 percent of epoxidized soybean oil. In the forming technique of metal powder, the binder can improve the strength of blank, reduce the damage of the blank and improve the finished yield and the production efficiency.

Heat dissipation during the operation of integrated circuit chips is an old problem that continues to get worse. The present invention significantly ameliorates this by placing an embedded heat pipe directly beneath the chip. Using powder injection molding, the lower portion of the package is formed first as an initial green part which includes one or more cavities. The latter are then lined with a feedstock that is designed to produce a porous material after sintering, at which time a working fluid is introduced into the porous cavities and sealed, thereby forming one or more heat pipes located directly below the chip. The latter is then sealed inside an enclosure. During operation, heat generated by the chip is efficiently transferred to points outside the enclosure. A process for manufacturing the structure is also described.

The invention discloses a method for preparing disposable minimally invasive surgical scissor blades, which comprises the following steps of: mixing a stainless steel powder substrate material and a binder, pelletizing to obtain uniform feed, injecting the feed by a powder injection molding technology to obtain an injection blank of the scissor blades, removing the binder by a degreasing process,sintering the degreased blank, and performing heat treatment strengthening to obtain disposable minimally invasive surgical scissor blade products. The minimally invasive surgical scissor blades are prepared by the powder injection molding technology, shapes can be formed at one time, a process for mass production through a mold is adopted, the automation degree, performance and yield are high, subsequent processing is not needed, the utilization rate of raw materials is high, and cost is low, so that one-time popularization of minimally invasive surgical scissors can be realized.

The invention discloses an adhesive for powder injection forming and a preparation method thereof. The adhesive comprises the following components in percentage by mass: 5-10% of liquid paraffin, 5-15% of naphthalene, 15-20% of solid paraffin, 10-20% of microcrystalline wax, 15-20% of carnauba wax, 15-30% of first high-molecular polymer, 10-20% of second high-molecular polymer and 1-5% of stearic acid. The first high-molecular polymer and second high-molecular polymer are selected from any two of polyethylene, polypropylene, polyacrylate and acrylonitrile-butadiene-styrene copolymer. The method comprises the following steps: after feeding materials of the adhesive, injecting a green compact, putting in a sintering furnace, and carrying out hot removal on the green compact in the furnace by heating to 600 DEG C at the rate of 2-5 DEG C/minute, thereby completely removing the adhesive; and heating for sintering according to the sintering technique, thereby obtaining the finished product. The adhesive has the advantages of simple and controllable degreasing process and high degreasing efficiency; and the degreasing process can not influence the quality of the green compact, and is clean and environment-friendly.

The invention discloses binder for micro-powder injection molding and an application method thereof. The binder comprises the following components by mass percentage: 15% to 25% of industrial paraffin, 20% to 30% of Brazilian wax, 15% to 32% of high-density polyethylene, 10% to 20% of low-density polyethylene, 5% to 20% of vegetable oil and 1% to 7% of stearic acid. The application method of the binder comprises the following steps: mixing the binder and metal powder by a volume ratio of (50-58):(50-42); injection molding; de-fatting; and sintering to obtain a micro-metal part. The binder of the invention has lower viscosity but enough strength, and the binder has better injection molding capacity and green-pressing stability; the binder, due to the flowability, facilitates the micro-injection molding process and avoids the damage caused by demolding green bodies; the density of injection-molded green bodies is uniform; and the de-bound micro-metal parts resistant to cracks and deformation can be produced through the thermal de-binding process at low temperature and at a low heating rate.