11 results about "Solvent debinding" patented technology

The invention discloses an oxygen control process for injection-molded titanium alloy based on oxygen-free solvent degreasing, which belongs to the technical field of powder metallurgy materials and comprises the following steps of: banburying and cooling pre-alloyed titanium powder and a binder matrix, granulating and injection-molding, and degreasing, drying and sintering by using an oxygen-free solvent. According to the method, a full-process oxygen control process chain of vacuum pre-drying of pre-alloyed titanium powder, preparation of an oxygen-free binder, extraction and degreasing of an oxygen-free solvent, vacuum thermal degreasing and graphite furnace temperature control sintering is constructed, invasion of impurity elements such as carbon, oxygen and nitrogen is blocked from the source to a finished product, and the core bottleneck that the oxygen content of the powder metallurgy titanium alloy is difficult to control is solved; and the consistency of the strength and plasticity of the product is guaranteed through stable impurity control, and performance fluctuation caused by out-of-control of the oxygen content is avoided.

The invention provides a preparation method of a hollow metal product, and the preparation method comprises the steps that an insert feed is injected into an insert mold cavity to obtain an insert, the insert feed comprises a main body framework, an antioxidant and a lubricant, the mass fraction of the main body framework is 97%-99.8%, the mass fraction of the antioxidant is 0.1%-2%, and the mass fraction of the lubricant is 0.1%-2%; the mass fraction of the lubricant is 0.1%-1%; the insert is placed in a metal mold cavity, the metal feed is injected into the metal mold cavity so that the insert can be wrapped with the metal feed, and an injection blank is obtained; solvent degreasing is conducted on the injection blank to remove the embedded part, and a metal degreasing blank of a hollow structure is obtained; and sintering the metal degreased blank to obtain the hollow metal product. According to the preparation method provided by the invention, the product quality of the hollow metal product can be improved.

The invention belongs to the technical field of surface strengthening of powder metallurgy parts, and aims to solve the problem that an existing clutch tooth surface strengthening process is difficult to consider geometric accuracy, abrasive resistance and process efficiency at the same time. The invention provides a clutch tooth surface wear resistance strengthening method which comprises the following steps: mixing iron-nickel-molybdenum alloy powder, nano tungsten carbide powder, nano aluminum oxide powder and a lubricant, and adding a binder for melting and mixing; adding the mixture into a mold for injection molding; then sequentially carrying out solvent degreasing and thermal degreasing treatment; then carrying out pre-sintering treatment; then, the pre-sintered part is moved into a chemical vapor deposition reaction chamber, and an intermetallic compound transition layer, a titanium carbide main layer and a nanocrystalline surface layer are sequentially deposited on the tooth surface; then vacuum sintering, liquid-phase sintering and pressurized cooling are sequentially carried out; the final sintered part is subjected to hot isostatic pressing strengthening treatment; and finally, tooth surface grinding treatment is carried out. The three aspects of geometric accuracy, abrasive resistance and process efficiency of the clutch tooth surface strengthening process can be considered at the same time.

The invention discloses a stainless steel-based powder metallurgy alloy label and a preparation method thereof, and relates to the technical field of powder metallurgy, the preparation method of the alloy label comprises the following steps: injection: adding stainless steel metal powder and a binder into a container, heating for melting, uniformly stirring, injecting and filling into a mold, cooling, and demolding to obtain a blank; degreasing: sequentially carrying out pre-flushing, degreasing and post-flushing on the green body to obtain a degreased green body; the degreased green body is sequentially subjected to solvent degreasing, vacuum internal sintering, partial pressure sintering and forced cooling, and a sintered green body is obtained; sand blasting: carrying out sand blasting on the surface of the sintered green body to obtain a sand-blasted green body; and deposition is conducted, specifically, the sand blasting green body is sequentially subjected to pretreatment, vacuum coating and aftertreatment, and the alloy label is obtained.

The invention provides a preparation method of a hollow metal product, and the preparation method comprises the steps that an insert feed is injected into an insert mold cavity to obtain an insert, the insert feed comprises a main body framework, a heat stabilizer and a lubricant, the mass fraction of the main body framework is 98%-99.8%, the mass fraction of the heat stabilizer is 0.1%-1%, and the mass fraction of the lubricant is 0.1%-1%; the mass fraction of the lubricant is 0.1%-1%; the insert is placed in a metal mold cavity, the metal feed is injected into the metal mold cavity so that the insert can be wrapped with the metal feed, and an injection blank is obtained; solvent degreasing is conducted on the injection blank to remove the embedded part, and a metal degreasing blank of a hollow structure is obtained; and sintering the metal degreased blank to obtain the hollow metal product. According to the preparation method provided by the invention, the product quality of the hollow metal product can be improved.

The invention discloses a preparation method of a multilayer diamond brazing tool based on thermoplastic resin molding, which comprises the following steps: taking thermoplastic resin such as polyformaldehyde as a binder, banburying with metal powder (iron-based, copper-based or WC-Co-based alloy) to prepare a feed, crushing, screening, and carrying out hot press molding to form a matrix with a concave structure; the concave part is filled with a diamond gypsum body containing active brazing filler metal, and organic matter is removed through solvent degreasing or stepped thermal degreasing; and then synchronously completing matrix sintering and diamond brazing in a vacuum environment. By means of the process, the diamond exposure height can exceed 50%, the service life of a tool is prolonged by 2-3 times, the chip containing space is increased by 30% or above, and the problem of machining blockage is effectively solved. For a large-size tool, modular design is adopted, and the whole large-size multi-layer brazing tool is obtained after the small unit base bodies are spliced. The method is suitable for manufacturing high-end tools such as grinding wheels, drill bits and grinding cutters, and particularly meets the requirements of the fields of aerospace, precision machining and the like for high-performance diamond tools.

This invention belongs to the field of powder metallurgy component surface strengthening technology, aiming to solve the problem that existing clutch tooth surface strengthening processes struggle to simultaneously achieve geometric accuracy, wear resistance, and process efficiency. This invention provides a method for strengthening the wear resistance of clutch tooth surfaces, comprising: mixing iron-nickel-molybdenum alloy powder, nano-tungsten carbide powder, nano-alumina powder, and lubricant; adding a binder and melting and mixing; then adding the mixture into a mold for injection molding; subsequently performing solvent degreasing and thermal degreasing treatments; followed by pre-sintering treatment; then transferring the pre-sintered part into a chemical vapor deposition reaction chamber, where an intermetallic compound transition layer, a titanium carbide main layer, and a nanocrystalline surface layer are sequentially deposited on the tooth surface; then performing vacuum sintering, liquid phase sintering, and pressurized cooling; finally, subjecting the sintered part to hot isostatic pressing (HIP) strengthening treatment; and finally, grinding the tooth surface. This invention can simultaneously address the three aspects of clutch tooth surface strengthening processes: geometric accuracy, wear resistance, and process efficiency.

The application relates to the technical field of ceramics, in particular to an injection molding process of large SiAlON ceramics, an injection molding process of large SiAlON ceramics, which comprises the following steps: A, ceramic powder preparation; B, feed preparation; C, injection molding; D, solvent debinding; E, thermal debinding and pre-sintering; and F, sintering. The large SiAlON ceramics produced by the injection molding process has high size precision, the size tolerance of the finished product after sintering can be controlled within 0.1%, the surface finish can reach 3-5 microns, the required machining allowance is extremely small, the cost required for the size precision machining in the later stage is greatly reduced, the production cycle is short, and the production efficiency is greatly improved.

The invention relates to the field of neodymium iron boron Halbach arrays, and particularly discloses an integrated neodymium iron boron Halbach array magnet and an integrated manufacturing method thereof. The manufacturing method comprises the steps that neodymium iron boron alloy magnetic powder with the average particle size being 4.0-6.0 microns and the sphericity degree being 0.75-0.85 is mixed with an additive, after granulation, orientation forming is carried out under the synergistic effect of pulsed magnetic field orientation and injection forming, and an integrated neodymium iron boron Halbach array orientation green body is obtained; the integrated neodymium iron boron Halbach array oriented magnet is obtained through solvent degreasing, thermal degreasing and vacuum sintering; and after surface finishing and electroplating treatment, magnetizing the integrated NdFeB Halbach array orientation magnet by adopting a pulsed magnetic field to obtain an integrated NdFeB Halbach array magnet product. Orientation molding is carried out under the action of pulsed magnetic field orientation and injection molding, the raw material utilization rate is high, the processing period is short, the obtained integrated neodymium iron boron Halbach array orientation green body is uniform and compact in texture, and excellent magnetic performance and mechanical performance can be kept after sintering.

The application provides a method for preparing copper heat dissipation material by electrolytic copper powder injection molding, and relates to the technical field of powder metallurgy. The method comprises the following steps: obtaining electrolytic copper powder subjected to grinding and crushing treatment; performing high-temperature and high-speed closed kneading on the electrolytic copper powder, alloy powder and wax-based binder to obtain high-purity feedstock; then performing injection molding on the high-purity feedstock to obtain a green part; then performing solvent degreasing and heating degreasing on the green part to obtain a sample after thermal degreasing; then sequentially performing normal-pressure sintering in a hydrogen atmosphere, solid solution aging treatment and pressure sintering on the sample after thermal degreasing; and finally performing annealing stress relief treatment to obtain the copper heat dissipation material. The electrolytic copper powder has high purity, large specific surface area, high sintering activity, excellent electric conductivity and thermal conductivity, and the material has high strength and excellent ductility through solid solution aging treatment, so that the preparation of high-thermal-conductivity large-size complex structure copper heat dissipation material is realized, the preparation process is stable, the price is low, and the method is more suitable for mass production and use.

The invention discloses a preparation method of a copper / molybdenum copper / copper layered composite material with a dual-scale heat conduction channel. The preparation method specifically comprises the following steps: step 1, establishing a molybdenum skeleton model; 2, a binder and molybdenum powder are mixed, and powder extrusion molding feed is prepared; 3, slicing the molybdenum skeleton model established in the step 1, introducing the sliced molybdenum skeleton model into a powder extrusion molding machine, and adding the feed prepared in the step 2 into a feeding cabin of the powder extrusion molding machine to prepare a molybdenum skeleton; 4, the molybdenum framework prepared in the step 3 is sequentially subjected to solvent degreasing, thermal degreasing and high-temperature sintering, and a dual-scale molybdenum framework is obtained; and 5, the double-scale molybdenum skeleton obtained in the step 4 is sequentially subjected to surface modification, infiltration and densification treatment, and the copper / molybdenum copper / copper layered composite material with the double-scale heat conduction channel is obtained. The preparation method solves the problem that in the prior art, a reliable and stable heat transport channel is difficult to form through a powder metallurgy and infiltration preparation method, so that the heat transfer behavior is limited, and the heat conduction efficiency is low.