69 results about "Powder injection molding" patented technology

The invention provides a binder system for beryllium-titanium alloy powder injection molding and application, and relates to the technical field of metal powder injection molding. The adhesive system consists of the following components in percentage by weight: 76 to 84 percent of polyformaldehyde, 7 to 9 percent of high-density polyethylene, 5 to 7 percent of ethylene-vinyl acetate copolymer, 3 to 5 percent of paraffin, 0.1 to 0.5 percent of stearic acid, 0.1 to 1.5 percent of polyethylene glycol and 0.1 to 1 percent of BASF antioxidant. The feed preparation method based on the system comprises the steps of powder pretreatment, binder preparation, banburying mixing and cooling granulation, and uniform coating and dispersion of beryllium-titanium powder can be achieved. According to the system, the problems that in beryllium-titanium alloy injection molding, powder is prone to oxidation, poor in fluidity and low in size precision are solved, the viscosity of the prepared feed at 180 DEG C is 88-101 Pa.S, and the oxygen content is smaller than or equal to 0.24 wt%; the relative density of a finished product is larger than or equal to 96.5%, the size precision is + / -1% / in-+ / -2% / in, and the method is suitable for industrial production of beryllium-titanium alloy complex parts in the fields of spaceflight and nuclear energy.

The invention relates to the field of powder injection molding materials, in particular to an NbC particle reinforced ultra-high-strength steel composite material and a molding process thereof, the composite material is prepared by mixing NbC powder and ultra-high-strength steel powder, the volume ratio of the NbC powder to the ultra-high-strength steel powder is 1: 19-3: 17, namely, the volume fraction of NbC is 5%-15%. The D50 of the NbC powder is 1.0 [mu] m + / -0.5 [mu] m. The forming process comprises the steps of raw material preparation, mixing, banburying and granulation, injection molding, degreasing, sintering and heat treatment. The NbC particles in a specific proportion are added into an ultrahigh-strength steel matrix through a metal injection molding process, so that the wear resistance of the material is remarkably improved, meanwhile, the high-strength characteristic is kept, and the dual requirements of high strength and high wear resistance are met.

The invention relates to the technical field of powder injection molding control, in particular to a control method and system for powder injection molding based on quantum computation.The method comprises the steps that fitting calculation is conducted on the loading capacity, the powder mass, the powder density, the plastic adding density and the finished product density, intermediate parameters of the proportional relation between plastic and powder are obtained, and a proportionality coefficient is deduced; and the formula calculation precision is improved. The volume ratio is calculated based on the design size and the actual measurement size of the workpiece, the proportion of the adhesive is dynamically corrected, and the process instability caused by proportion imbalance is avoided. And further constructing a quantum circuit comprising a Hadamard door, a revolving door and a full-connection CZ door, performing quantum state sampling on the component proportion, and iteratively optimizing a cost function of density and shrinkage rate in combination with SLSQP and L-BFGS-B algorithms to realize global optimization. Through proportional truncation and normalization correction and verification through preset constraints, the stability of powder injection molding and the consistency of finished products are improved.

This invention discloses a liquid-cooled microchannel powder metallurgy fabrication method, belonging to the field of radiator manufacturing technology. The invention employs a pre-stamping process to prepare copper heat dissipation fins, combined with customized spherical high-purity copper powder and composite polymer bonding particles. A uniform mixture is prepared through segmented high and low temperature and high and low speed stirring. This is then combined with metal powder injection molding, oxalic acid degreasing, nitrogen atmosphere constant temperature anti-oxidation pretreatment, and high-vacuum sintering processes, along with controllable molding and sintering parameters, to fabricate a copper liquid-cooled microchannel radiator. This invention effectively solves the problems of difficult molding of thin-walled pure copper microchannel structures, poor dimensional consistency, and susceptibility to defects and springback. It significantly improves the extrusion of copper materials in microchannel structures, the smoothness of the inner wall, and the overall density, strengthens the bond strength between the fins and the substrate, and eliminates leakage, corrosion, and heat dissipation attenuation under long-term liquid cooling cycles. The product yield is high, and the stability is excellent.

The invention belongs to the technical field of metal material preparation, and discloses a feed formula for a low-oxygen-content titanium alloy FGF (Fibroblast Growth Factor), which consists of 85-92% of titanium alloy powder and 8-15% of a multi-element binder system, the binder comprises a polylactic acid / polycaprolactone blending skeleton capable of being catalytically degraded, a wax component capable of being extracted at low temperature, a compound surfactant and a high-boiling-point plasticizer, and a supported stannous octoate catalyst is introduced. According to the invention, a multi-component binder system consisting of a catalytically degradable polymer skeleton, a wax component capable of being extracted at a low temperature, a compound surfactant and a high-boiling-point plasticizer is constructed, and a two-stage degreasing process is matched, so that the fundamental contradiction between the degreasing efficiency and the material purity in titanium alloy powder injection molding is successfully solved; and a feasible technical path is provided for large-scale manufacturing of high-reliability and high-purity titanium alloy complex components.

The utility model relates to the technical field of injection molding equipment, in particular to metal powder injection molding equipment which comprises a molding cylinder, a molding groove is formed in the molding cylinder, a limiting ring is installed at the position, close to the top end, of the inner wall of the molding groove, an ejection structure is installed in the molding groove, and the ejection structure comprises four sets of limiting cylinders. A mounting ring is mounted on the side surface of the forming cylinder, two sets of electric push rods are mounted at the top end of the mounting ring, and the top ends of the two sets of electric push rods are both mounted to the bottom end of a mounting disc. Through the arrangement of parts such as a limiting barrel, a compression spring, an ejector plate, a mounting ring, an electric push rod, a mounting disc, a feeding barrel, an injection pipe, a motor, a mounting rod, a stirring roller, a scraping plate and a feeding hole, the problems that in the process from material conveying to injection molding of existing injection molding equipment, metal powder is prone to thermal shrinkage and condensation can be effectively solved; the non-uniform or hardening condition is caused during injection molding, so that the injection molding quality is influenced.

The invention relates to the field of powder injection molding materials, in particular to high-strength, high-toughness and high-wear-resistance tool steel and a molding process thereof, and the tool steel comprises the following components in percentage by mass: 1.0-1.6% of C, 0.1-0.6% of Si, less than 1.0% of Mn, less than 1.0% of P, less than 1.0% of S and the balance of Fe. The alloy comprises the following components in percentage by weight: 3.0%-8.0% of Cr, 0.5%-3.0% of Mo, 0.5%-2.0% of V and less than 1% of Zr; 1.0% to 4.0% of Nb; less than 5.0% of Co; ce / La: less than 0.1%; according to the tool steel material, the size of main carbides in the tool steel material is finally smaller than 2 micrometers through the injection molding technology, selection of appropriate alloy elements and content and the appropriate heat treatment technology, and therefore the material has better abrasion resistance and meanwhile has good toughness and high strength.

The invention relates to the technical field of injection molding, in particular to a steel alloy powder injection molding method with strength and a high polishing effect. The injection molding method comprises the following steps: preparing a green body from steel alloy powder and TiH2 powder, and sequentially degreasing and sintering the green body to obtain a steel alloy product; the sintering is carried out in a mixed atmosphere of hydrogen and argon, and the temperature is raised to 1250-1400 DEG C at a heating rate of 3-15 DEG C / min during sintering. According to the injection molding method, TiH2 powder is added into high-strength steel powder, the overall compactness of the material is improved, a small amount of Ti element is introduced, and the strength of the material is improved; and meanwhile, by increasing the heating rate of the sintering section and introducing the hydrogen atmosphere in the sintering process, surface layer pores are rapidly closed, and the high-strength steel with the strength and the polishing property is obtained.

The invention discloses an automatic material taking and discharging device of a metal powder injection molding machine, and relates to the technical field of metal injection molding, the automatic material taking and discharging device comprises a motor base, an output shaft of the motor base is connected with a vertical rod, the upper end of the vertical rod is connected with a cross beam, and a hydraulic cylinder is installed on the upper portion of one side of the cross beam; a manipulator is connected to the position, located below the cross beam, of an output shaft of the hydraulic cylinder, the manipulator comprises a shell base, a servo motor is installed on the upper portion of the shell base, the output shaft of the hydraulic cylinder is connected to the upper portion of the servo motor, and a screw is connected to the position, located in the shell base, of the output shaft of the servo motor. According to the automatic material taking and discharging device of the metal powder injection molding machine, the servo motor drives the screw rod and the threaded sleeve to be linked, so that a workpiece is accurately adsorbed by the suction cup, meanwhile, the supporting plate gradually moves towards the bottom of the workpiece in the upward moving process of the threaded sleeve, and finally the bottom of the workpiece is supported; by means of the design, the workpieces are effectively prevented from falling off in the sucking and hoisting processes.

The invention discloses a laser automatic sprue removing device and method in a powder injection molding process, a laser cutter is installed on a sliding block of a vertical module, a conveying module and two conveying rails symmetrically distributed about the conveying module are installed above a machine table, a conveying plate is installed on the conveying rails in a front-back sliding mode, and a laser cutter is installed on a sliding block of the vertical module. A conveying plate is fixed to a sliding block of the conveying module, a blank fixing mold is fixed to the conveying plate, a protection structure used for protection during cutting is installed on the left side of the upper portion of the conveying plate, and a supporting and clamping structure used for supporting and fixing a blank sprue and an air suction piece used for dust collection and cooling are installed in the protection structure; the supporting and clamping structure is arranged in the protection structure, the pouring gate can be clamped and fixed before cutting, the situation that the pouring gate droops due to the weight of the pouring gate in the cutting process is avoided, notch dislocation caused by gravity is effectively prevented, and the cutting quality is improved.

The invention relates to a preparation method of an integrally-formed complex cavity part and a liquid cooling plate. According to the method, a material which can be decomposed or dissolved under the acid catalysis condition and / or the action of a specific solvent is adopted to be subjected to injection molding to form a removable insert; then, in a powder injection molding die, wrapping the removable insert with a metal feed to form a composite green body; thirdly, the composite blank is placed in a corresponding acid catalysis atmosphere or a specific solvent, insert removal and catalytic degreasing are synchronously completed, and a degreased blank with a complex cavity is obtained; and finally, sintering and post-processing to obtain a final part. The method is especially suitable for preparing liquid cooling plates containing complex flow channels such as microchannels and pin fins. Integrated net forming of a complex inner cavity structure is achieved, assembly errors and interface thermal resistance caused by split manufacturing are thoroughly avoided, the part density is high, the size precision is good, the heat dissipation performance is excellent, meanwhile, the manufacturing method has the advantages of high efficiency and low cost of the MIM technology, and the manufacturing problem of a high-power device heat dissipation assembly is perfectly solved.

Methods of manufacturing a turbine shroud segment for a gas turbine engine are disclosed. One method involves receiving a turbine shroud segment green part, machining an axial cooling flow passageway in the turbine shroud segment green part, and after the machining of the axial cooling flow passageway, debinding and sintering the machined turbine shroud segment green part. Another method involves receiving a turbine shroud segment green part, machining a textured surface on the radially outer surface of the body to obtain a machined turbine shroud segment green part, and after the machining of the textured surface, debinding and sintering the machined turbine shroud segment green part. Another method involves injecting powder injection molding material into a mold having cavities defining negatives of features forming a textured surface on the radially outer surface of the body, and debinding and sintering the molded turbine shroud segment green part.

This invention discloses a process for preparing ceramic particle-reinforced steel-based composite materials, belonging to the field of wear-resistant material preparation technology. The method of this invention includes: a powder mixing process, a powder injection molding process, a vacuum debinding process, and a vacuum hot-pressing sintering process. The process scheme is as follows: First, ceramic particles with attached rare earth elements Y and La, iron powder, and an organic binder are added to a ball mill jar and thoroughly mixed using a planetary ball mill. The granulated powder is heated and plasticized, then injected into a mold cavity using a powder injection molding machine. After curing and shaping through processes such as pressure holding, debinding is performed using a vacuum debinding furnace. Finally, the ceramic particle-reinforced steel-based composite material is obtained through vacuum hot-pressing sintering. The method of this invention can prepare metal-based composite materials on a large scale, resulting in a denser microstructure and wear-resistant materials with better resistance to wear, corrosion, and impact.

The invention relates to the field of metal powder injection molding, and discloses an efficient molding method for universal appliance MIM parts. The method comprises the following steps: feed preparation and parameter matching based on digital twin simulation; carrying out self-adaptive injection molding by utilizing a mold with a sensor; based on injection data and online weighing feedback, data-driven degreasing and sintering are executed in the integrated equipment; and finally, continuous optimization is realized through model verification and data closed loop. According to the method, rapid and flexible adaptation of multi-specification parts is achieved through the structure-process mapping database and intelligent simulation, process splitting is broken through real-time sensing and feedback control, fine compensation is carried out on a complex structure by means of a multi-physical field model, and therefore the production efficiency and the size precision are improved, and meanwhile the production cost is reduced. And the process stability and the product consistency are remarkably enhanced, and the effects of efficient forming and high-precision forming of the same-series multi-variety parts are achieved.

This invention provides a directional thermally conductive copper-based diamond composite material and its preparation method, belonging to the technical field of copper-based diamond composite materials. By constructing a "diamond particle size gradient + aluminum nitride / silicon carbide ceramic gradient," combined with multilayer powder injection molding and segmented vacuum hot pressing, the thermal conductivity and thermal expansion in the thickness direction are synergistically controlled: the upper layer of fine-grained diamond and a small amount of aluminum nitride forms a high thermal conductivity layer, the middle layer of medium-grained diamond and a relatively high amount of aluminum nitride acts as a thermal-mechanical buffer, and the lower layer of coarse-grained diamond and silicon carbide improves the expansion matching and sintering stability of the substrate side; sequential injection combined with interval time and thickness ratio control forms a continuous composition gradient and particle intercalation interface during debinding and densification processes, and through two-step heating, three-stage pressure, depressurization and slow cooling, and medium-temperature heat preservation, densification, interfacial reaction and residual stress release are taken into account, so that the copper-based diamond composite material maintains high thermal conductivity while having an adjustable expansion gradient and high structural reliability.

The present application relates to a binder for powder injection molding, a mixed binder, a feedstock and a molding process, wherein the binder comprises 48% mannitol, 48% resin containing epoxy and unsaturated double bond, and 4% photoinitiator by weight percentage; the binder is formed by mixing the photoinitiator after the ring-opening reaction of the epoxy group with the hydroxyl group in the mannitol. The mixed binder and the feedstock prepared by the binder can meet the requirements of low-temperature and low-pressure injection curing, and ingeniously apply the ultraviolet curing method to the powder injection molding process, thereby effectively solving the problems of the existing powder injection molding process, such as the easy occurrence of burrs in the product due to high-temperature and high-pressure injection, the easy sticking of the binder to the mold and the overflow of the material due to the softening of the binder caused by the high mold temperature in mass production, the frequent mold repair, and the influence on the production capacity.

A holding device for cards and / or bank notes, contains a housing, which is open on the top and has a base, wherein the base has lateral webs, which protrude upward and are spaced apart from one another. To easily produce a housing of a holding device for cards and / or bank notes and, in doing so, maximally protect the cards and / or bank notes to be inserted, the housing is produced by powder injection molding and / or the housing has at least one lubricant.

The invention discloses a preparation method of a high-yield aluminum alloy powder injection molding feed, and belongs to the technical field of metal powder injection molding, and the method comprises the following steps: through component optimization, on the basis of a 6-series aluminum alloy, controlling the mass content of Mg to be 0.9-1.2%, the mass content of Si to be 0.7-1.0% and the mass content of Cu to be 0.7-1.1%; and then aluminum alloy powder is prepared, adhesive particles are prepared, pressurized banburying is carried out, and granulation is carried out. And the fluidity, uniformity and sintering performance of the feed are remarkably improved, so that stable forming of the aluminum alloy structural part with high density and high yield strength is realized.

The invention provides a binder for powder injection molding and a method and device for hot cutting in a powder injection molding die. The binder comprises 20-40 parts of a high-melting-point framework polymer, and the melting point of the high-melting-point framework polymer is 120-190 DEG C; 10-35 parts of a low melting point phase, the melting point of which is 50-80 DEG C; 10-25 parts of high-melting-point microcrystalline wax, the melting point of which is 80-100 DEG C; 1 to 10 parts of a lubricant; and 0.5-8 parts of self-lubricating anti-attrition modifier forms a three-gradient melting point stepped structure, so that a sprue region is preferentially softened in the hot cutting process, and the strength of a product main body is kept. According to the in-mold hot cutting method, the pressure change of a cavity is monitored, heating and cooling control of the cutter is combined, cutting is conducted when a sprue binder is in a suitable softening state, sprue residues and product deformation can be reduced, the durability and forming efficiency of the cutter are improved, and the in-mold hot cutting method is suitable for manufacturing of metal and ceramic powder injection forming parts.

The invention relates to the technical field of metal powder injection molding, in particular to a thin-wall product and a production process and auxiliary production device.The thin-wall product is a metal part, a row of penetrating holes are formed in the metal part, and the production process of the thin-wall product comprises the steps of insert pressing and supporting, film coating treatment, insert injection, degreasing, sintering, insert disassembling and aftertreatment. An auxiliary production device of the production process is used for clamping and transferring the supporting insert or a composite body of the supporting insert and the MIM green body. According to the injection molding technology, the ceramic supporting insert is combined with the MIM technology, and the problems that no ejector pin space exists during injection molding of a thin-wall product, deformation is prone to occurring in the catalytic degreasing and high-temperature sintering process, demolding is difficult and the like are solved; the rigid, heat-resistant and stable-shape ceramic supporting insert is used for physically supporting and limiting the thin-wall product all the time, and deformation of all stages, especially the sintering stage with the maximum shrinkage rate is greatly restrained.

The invention relates to the technical field of stainless steel powder injection molding, in particular to stainless steel powder injection molding equipment and a preparation method.The stainless steel powder injection molding equipment comprises a mounting support and a filtering tank rotationally mounted on the mounting support, a guiding pipeline is fixedly mounted at the upper end of the filtering tank, and a heating connecting tank is fixedly mounted at the upper end of the guiding pipeline; a detachable upper cover is arranged at the upper end of the heating connecting tank, a discharging pipe is fixedly installed at the lower end of the filtering tank, and movable rotating columns are arranged in the filtering tank, the guiding pipeline, the heating connecting tank and the discharging pipe. Materials are turned over upwards through the inclined paddle structure to form a flow field direction opposite to that of the stirring rod, and the stirring rod and the paddle move oppositely to form a strong convection area at the junction of the heating connecting tank and the guide pipeline, so that the materials are forced to undergo multiple times of cyclic shearing and convection diffusion, and the problem of dead angles existing in traditional single stirring is solved; it is further ensured that the binder completely wraps the powder particles, and high-uniformity feeding is provided for subsequent injection molding.

The utility model discloses a hollow rotating shaft part shaping tool which comprises a lower installation base and an upper installation base, a lower die base is arranged on the upper portion of the lower installation base, an upper die base is arranged on the lower portion of the upper installation base, a sliding block is arranged in the lower die base, and a lower shaping cavity is formed in the surface of the sliding block. A lower mold cavity insert is arranged in the lower shaping cavity, an upper shaping cavity is formed in the upper mold base, and the upper shaping cavity corresponds to the lower shaping cavity. After the upper die and the lower die are closed, the sliding block and the shaping cavity are used for extruding the appearance part of a product, the shaping function can be achieved, the product performance is not affected, the deformation control problem of the powder injection molding sintering process is solved, the size correction precision reaches + / -0.02 mm, and the appearance indentation defect caused by traditional shaping is eliminated; and the size springback phenomenon caused by residual stress release after sintering is effectively inhibited.

The utility model discloses an automatic feeding mechanism for powder injection molding product processing, which belongs to the technical field of powder injection molding product processing and comprises a first rotating shaft, and one side of the outer surface of the first rotating shaft is slidably connected with a second rotating shaft. A first external thread or a second external thread is arranged at one end of the outer surface of the first rotating shaft and one end of the outer surface of the second rotating shaft correspondingly, and the first external thread and the second external thread are connected with a first connecting belt or a second connecting belt in a matched and meshed mode correspondingly. The other end of the first connecting belt and the other end of the second connecting belt are connected to the output ends of different servo motors in a meshed mode, a connecting roller is fixedly connected to the other end of the outer surface of the second rotating shaft, and first rotating fan blades or second rotating fan blades are fixedly connected to the outer surfaces of the first rotating shaft and the connecting roller. By means of the device, even if multiple raw materials are supplied, the raw materials do not affect one another, mutual mixing pollution of the different raw materials is avoided, and the production space is saved.

The embodiment of the invention discloses a high-elongation iron-cobalt-vanadium alloy feed and an iron-cobalt-vanadium alloy processing method, and the feed comprises the following components in percentage by mass: 5-10% of polyformaldehyde, 1-3% of a lubricant, 0.1-1% of an antioxidant and 87-93% of iron-cobalt-vanadium-chromium alloy powder. According to the method, the matrix iron-cobalt alloy structure in the sintering process is improved by adding the trace chromium, precipitation of an unstable phase is reduced through the solid solution technology, the elongation of iron-cobalt-vanadium is improved by adding the trace chromium, the alloy can be used for producing complex powder injection molding structural parts and can be subjected to shaping machining, and the risk of machining breakage is reduced.

This invention relates to the field of injection molding machine technology, and in particular to a screw unit for a powder injection molding machine, comprising a spline sleeve and multiple kneading block units sequentially sleeved on its outer peripheral wall; the lower end of the spline sleeve is provided with a stop boss, the boss having a first helical surface and a first positioning hole, the spline sleeve being paired with a drive component corresponding to each kneading block unit; the kneading block unit includes a kneading disc, a spring, and a locking pin, the kneading disc having a second helical surface and a second positioning hole, the lower end of the locking pin having a locking part adapted to the positioning hole and a third helical surface cooperating with the drive component, and the spring being located between adjacent kneading discs or between the kneading disc and the stop boss. This invention achieves kneading disc phase adjustment simply by applying and releasing axial force, without disassembling the entire screw functional unit, improving production efficiency. Furthermore, the locking part and positioning hole are precisely matched during operation, ensuring kneading stability and molding accuracy. The modular structure offers excellent adaptability and maintainability.

The invention relates to the technical field of metal powder injection molding, in particular to an adhesive for metal powder injection molding and a preparation method of the adhesive. The invention discloses an adhesive for metal powder injection molding, which is prepared from the following raw materials in parts by weight: 50 to 70 parts of polyethylene glycol, 10 to 15 parts of high-density polyethylene, 20 to 25 parts of polypropylene, 5 to 10 parts of microcrystalline wax, 5 to 8 parts of stearic acid, 3 to 5 parts of ammonium sulfate, 1 to 2 parts of silane coupling agent and 0.1 to 0.5 part of antioxidant. Ammonium sulfate can be decomposed into sulfuric acid and ammonia gas in a high-temperature environment (higher than 300 DEG C), the ammonia gas can be combined with hydrocarbon free radicals generated by a high-molecular material at a high temperature, the possibility of coking and carbonization of the high-molecular material is reduced, the situation that carbon elements permeate into metal is further reduced, and the performance of a formed metal part is effectively guaranteed.

The application discloses a powder injection molding mold with a deformation pre-compensation function and relates to the technical field of powder injection molding molds.The powder injection molding mold comprises a mold carrier, a guide slide rod, a slide plate, a lower molding assembly and an upper molding assembly.The lower molding assembly comprises a plurality of spliced lower mold plates, each of which is connected with an adjusting positioning cover one through an adjusting rod one.The upper molding assembly comprises a plurality of spliced upper mold plates, each of which is connected with an adjusting positioning cover two through an adjusting rod two.The adjusting positioning cover one and the adjusting positioning cover two are connected with an air inlet and air outlet flow control module through an air path with a control valve.The application can independently adjust the position of each mold plate according to the shrinkage of different parts of a part, realize non-uniform pre-compensation of a cavity, adapt to the non-uniform shrinkage of the part, greatly improve the size precision of the part, and simultaneously improve the feeding filling density through a vibration mechanism, and is suitable for high-precision batch production of powder injection molding parts with complex structures.

The present application relates to the field of metal powder injection molding, and particularly relates to an aluminum alloy injection molding feedstock and a preparation method thereof, which solves the problems of low sintering activity and densification degree caused by surface oxidation film during sintering of aluminum alloy injection molding, and high cost, complex process and limited applicability of existing oxidation film breaking technology. The preparation method of the aluminum alloy powder injection molding feedstock comprises the following steps: step 1, mixing potassium fluorotitanate powder and sodium tetraborate powder according to a predetermined ratio to prepare a composite film breaker; step 2, carrying out first mixing and compounding of the composite film breaker and aluminum alloy powder to obtain a first mixture; step 3, adding a binder to the first mixture and carrying out second mixing and compounding to obtain a second mixture; and step 4, carrying out granulation treatment on the second mixture to obtain the aluminum alloy powder injection molding feedstock. The sintering activity and densification degree of the aluminum alloy injection molding part are significantly improved.

The ultrahigh-strength and high-toughness steel powder injection molding process comprises the following steps that high-strength steel powder and a binder are obtained, and the particle size D90 of the high-strength steel powder is smaller than 15 micrometers; mixing the high-strength steel powder and a binder together to obtain a granular injection feed; performing injection molding on the granular injection feed to obtain a green body; degreasing the green body to obtain a brown blank; sintering the brown blank, wherein the highest sintering temperature is 1240-1360 DEG C; and performing heat treatment on the product. According to the ultrahigh-strength and high-toughness steel powder injection molding process, the ultrahigh-strength and high-toughness steel part with the yield strength larger than or equal to 2000 MPa and the elongation larger than or equal to 5% is prepared by adopting the high-strength steel powder with the small particle size and adjusting the highest temperature of the sintering process. The process has the characteristics of simplicity, convenience, economy and high efficiency, and metal parts with ultrahigh strength, high toughness and three-dimensional complex shapes can be manufactured on a large scale.

The invention relates to the field of metal powder injection molding, in particular to an aluminum alloy injection molding feed and a preparation method thereof, and solves the problems of low sintering activity and densification degree caused by surface oxidation film obstruction during aluminum alloy injection molding sintering. And the problems of high cost, complex process, limited applicability and the like of the existing oxide film breaking technology are solved. A preparation method of an aluminum alloy powder injection molding feed comprises the following steps that 1, potassium fluotitanate powder and sodium tetraborate powder are mixed according to a preset proportion, and a composite film breaking agent is prepared; 2, the composite film breaking agent and aluminum alloy powder are subjected to first-time mixing banburying, and a first mixture is obtained; step 3, adding a binder into the first mixture, and carrying out secondary mixing banburying to obtain a second mixture; and 4, the second mixture is subjected to granulation treatment, and the aluminum alloy powder injection molding feed is obtained. And the sintering activity and the densification degree of the aluminum alloy injection molding part are remarkably improved.