2063 results about "Cemented carbide" patented technology

An ultrafine grain cemented carbide additive manufacturing method. WC-Co is used as a raw material, a crystal grain growth inhibitor is added, and a rare earth oxide is added as a reinforcing phase; paraffin and a trace amount of low-valence rare earth oxide powder are added, ball milling is carried out for coating cemented carbide powder, and oxygen control is carried out; the cemented carbide powder obtained by ball milling and an organic adhesive are loaded in a vacuum banbury mixer-granulator to prepare a printing feed, then a green body is printed using fused deposition modeling (FDM), and finally, degreasing and two-step sintering are carried out on the green body to prepare ultrafine cemented carbide. By means of the combined effect of the components and process optimization design, the powder properties are regulated, the process range of vacuum banburying and granulation and additive manufacturing is widened, and the problems of pores, interlayer cracks, and oxygen absorption in a printed green body, and abnormal grain growth, oxidation decarburization, and the formation of brittle η-phase in a sintered sample are solved. The prepared ultrafine grain cemented carbide exhibits high relative density, is free of metallurgical defects, possesses excellent mechanical properties, and is suitable for large-scale and mass production.

A tool includes a cemented carbide part and a maraging steel part, wherein the two parts are joined by brazing. The cemented carbide part has a hard phase embedded in a metallic binder phase matrix. The maraging steel part has a hardness of between 350 and 600 HV1 with a standard deviation between 0 and 20 HV1. A method of making such tool is also provided.

The present invention discloses a bionic swallowtail-shaped micro-textured tool and a preparation method thereof, belonging to the technical field of metal cutting tools. The preparation method is based on a cemented carbide tool substrate, and combines the structural advantages of the swallowtail structure in reducing frictional resistance and accelerating the flow of gas and liquid. On this basis, a corresponding functional tool is prepared by machining a bionic swallowtail-shaped groove and surface texture. The designed tool groove is used to discharge chips and store and convey cutting fluid; the surface texture is used to reduce the frictional force between the chip and the tool during cutting and promote the discharge of chips, thereby reducing the cutting force, improving the tool life and processing efficiency. Compared with the prior art, based on the bionic principle, the present invention combines the tool groove and the surface texture to design and prepare a functional tool, achieving the functional requirements of improving the heat resistance and wear resistance of the tool, prolonging the tool life, reducing the production and processing cost, and realizing green processing, and meeting the production and processing needs.

The invention belongs to the field of metal materials, and provides a hard alloy wear-resistant steel ball suitable for mine ore grinding and a preparation method thereof.The hard alloy wear-resistant steel ball is prepared from waste steel pig iron as a basic raw material and chemical components including 2.1%-2.2% of C, 9.8%-10.0% of Cr, 0.10%-0.20% of V and 0.03%-0.06% of Ti; a core-shell precipitated phase microstructure design with MN / MCN as a hard core and chromium carbonitride as a gradient self-passivation shell layer is formed through medium-frequency induction furnace smelting, controlled nitrogen introduction establishment of a V-Ti-C-N microalloy system, bottom pouring solidification and austenitizing quenching and tempering heat treatment processes, and the performance indexes that the surface hardness is HRC60-63 and the core hardness is HRC54-58 are achieved; the average particle size of a core-shell precipitated phase is in dispersed distribution of 20-200nm, the shell thickness is 5-50nm, and the alloy steel ball has excellent wear resistance and corrosion resistance under the high-impact and high-wear working conditions of wet ore grinding, solves the problem of insufficient wear resistance and corrosion resistance of a traditional alloy steel ball, and has wide mine ore grinding application value.

The invention discloses a high-hardness tungsten carbide-cobalt hard alloy and a preparation method thereof. A production raw material formula comprises the following components in parts by mass: 100 parts of tungsten carbide powder, 6-20 parts of cobalt powder, 0.2-1.3 parts of a composite sintering aid, 0.5-4 parts of a wet grinding medium and 0.2-4 parts of a forming agent, the composite sintering aid is composed of rare earth oxide and cobalt phosphide according to the mass ratio of (1-5): 1. The method has the advantages that on the premise that the toughness of the tungsten carbide-cobalt hard alloy is slightly improved, the hardness and wear resistance of the alloy are remarkably improved, and the industrial problems that the hardness improvement of the tungsten carbide-cobalt hard alloy with a single sintering aid is limited and the toughness of the alloy is lost are solved.

The utility model belongs to the technical field of control valves, and discloses a novel valve seat sleeve of a large-pressure-difference regulating valve, which comprises a regulating valve seat body, an anti-erosion WC (Wolfram Carbide) valve seat sleeve, a compression valve seat sleeve nut and a positioning screw. On the basis of keeping the function of the original valve seat sleeve, the WC hard alloy valve seat sleeve is embedded on the valve seat body, so that the problems of valve seat cavitation, scouring and abrasion failure caused by the use environment of a control valve adjusting core component are solved under the condition of reducing the use amount, the service life of the core component is prolonged, and the service life of the core component is prolonged. And long-period, safe and reliable operation of core components in an application environment is ensured.

The invention relates to the technical field of powder metallurgy, and particularly discloses an ultra-coarse grain WC-Co hard alloy and a preparation method thereof.The preparation method comprises the following steps that S1, the following raw materials including, by weight, 4.6-9.2 parts of cobalt powder, 96-102 parts of coarse grain tungsten carbide powder, 3.6-5.2 parts of functional gel, 3.4-4.6 parts of modified penetration enhancer, 2.2-2.8 parts of binder and 36-62 parts of organic solvent are prepared; step S2, preparation of a mixture; step S3, carrying out granulation treatment; step S4, compacting; step S5, pressurizing and sintering; the functional gel and the modified penetration enhancer are added, the functional gel contains yttrium oxide, polytannic acid, ultrafine tungsten carbide, tantalum carbide, chromium carbide, silica gel and other components, and the functional gel not only has excellent physical properties, but also can be cross-linked with the modified penetration enhancer to form a more compact silicon dioxide network structure; and the hardness, toughness, impact resistance and wear resistance of the alloy are improved.

The invention relates to a milling burr (1) for an electrically or pneumatically operated hand-held tool for deburring, shaping, grinding and finishing iron-free surfaces, comprising: - a shank portion (2) and - a milling portion (4) made of a hard metal, in particular tungsten carbide, which adjoins the shank portion (2) and ends in a milling tip (6), wherein the milling portion (4) has a milling length (f) and a plurality of cutting edges (10) which are separated by mutually spaced main flutes (14) which have a main flute depth (h) and extend helically in a first twist direction (16) with a first twist angle (α) along the milling length (f), wherein each of the cutting edges (10) has a rake face (20) and a relief face (24) and a cutting edge (12) at the transition of rake face (20) and relief face (24), forming a rake angle (γ) and a relief angle (δ). The milling burr (1) according to the invention is characterized in that said relief face (24) is a first relief face (24) and said relief angle (δ) is a first relief angle (δ), wherein the first relief face (24) is adjoined in the circumferential direction of the milling portion (4) by a second relief face (26) which extends at a second relief angle (ε), and, in the region of the milling portion (4) with the largest diameter, the first relief angle (δ) is in the range from 6° to 20° and the second relief angle (ε) is in the range from 8° to 30°, and the second relief angle (ε) is greater than the first relief angle (δ). The invention also relates to the use of such a milling burr (1).

The invention discloses a brazing method for improving the welding strength of a polycrystalline diamond cutter and a hard alloy. The brazing method comprises the following steps that S1, brazing filler metal alloying is conducted; and S2, the PCD tool bit and the hard alloy matrix are subjected to vacuum brazing. According to the brazing filler metal, an Ag-Cu-Co system is adopted, Ag mainly plays a role of a solder matrix and provides plasticity and thermal conductivity, Cu mainly plays a role of forming an eutectic structure with Ag and reducing the melting point, and Co mainly plays a role of wetting the surfaces of PCD and hard alloy. Co infiltration is adopted in the preparation process of the PCD tool bit used in the method, so that a certain amount of Co exists on the PCD surface, and the hard alloy tool body also contains Co, and therefore, a small amount of Co in the brazing filler metal can better wet the welding surface according to the similar intermiscible principle. In the vacuum brazing process, additional pressure does not need to be applied, when the brazing filler metal is molten, the brazing filler metal is evenly laid on the welding face under the action of the pressure of the PCD tool bit on the upper portion and the capillary effect, the redundant brazing filler metal can flow out of the two sides of the mold, and the flatness of the welding surface can be effectively guaranteed.

The invention discloses a temper mill bottom plate machining method which comprises the following specific steps that S100, appearance inspection is conducted on a bottom plate blank, and whether cracks and sand hole defects exist on the surface or not is checked; proper machining allowance is reserved according to the design size of the bottom plate; s200, a horizontal boring and milling machine is adopted, a hard alloy cutter is selected, and rough machining is conducted on the base plate blank in a multi-cutter and multi-blade milling mode; s300, the base plate obtained after rough machining is placed in an aging treatment furnace, the temperature is increased to 550-600 DEG C at the speed of 50-60 DEG C per hour, heat preservation is conducted for 4-6 hours, then the base plate is slowly cooled to the room temperature at the speed of 30-40 DEG C per hour, and therefore internal stress generated by rough machining is eliminated; s400, a horizontal boring and milling machine is adopted for conducting semi-finish machining on the bottom plate subjected to aging treatment; s500, carrying out vibration aging treatment on the semi-finished bottom plate by adopting vibration aging equipment; and S600, a high-precision numerical control grinding machine and a boring and milling machine are adopted for conducting finish machining on the bottom plate subjected to vibration aging treatment.

The present invention relates to a coated cutting tool (1) for metal machining comprising a cemented carbide substrate body (5) and a coating (6) comprising a layer of a metal nitride, there is an uppermost part of the cemented carbide substrate body (5) wherein there are uppermost WC grains adjacent to the coating (6), there is an intermediate zone between an uppermost part of said WC grains and the coating (6) comprising a peak of Me3 intensity in an EDX line scan made from within the coating (6) into a WC grain perpendicular to the surface plane of the WC grain, Me3 is one of Ti, Cr, Zr, Mo, Nb and V, the average content of Me3 within + / - 10 nm from the Me3 max peak position is from 2 to 30 at%, the Me3 within + / - 1.0 nm from the Me3 max peak position in the EDX line scan is present as a metal nitride or carbonitride, the average content of any noble gas element or combination of noble gas elements, within + / - 1.0 nm from the Me3 max peak position in the EDX line scan, is ≤0.6 at%.

The invention discloses a preparation method of a superfine WC-Co hard alloy. 89.8-90% wt of superfine tungsten carbide, 9% wt of superfine Co powder and 1-1.2% wt of composite additive chromium carbide and vanadium carbide are adopted; wherein the weight ratio of chromium carbide to vanadium carbide is 1 / 2; ball-milling the raw materials to obtain a mixture; and the pressed blank is subjected to a specific oscillation pressure and rapid cooling sintering process, the contact form and interface state among particles are improved, the density of the hard alloy is improved, WC grain growth is inhibited, flowing of binding phase Co is promoted, the structure and mechanical properties of the alloy are remarkably improved, and the nanocrystalline WC-Co hard alloy with high strength and high density is obtained.

A fluid end made of a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is made of a housing having a discharge bore and an intake bore formed therein. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing and between the discharge and intake bores. The fluid routing plug carries seals that engage sealing surfaces formed within the housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear within each housing.

The invention relates to a polycrystalline diamond compact and a preparation method thereof, and belongs to the field of preparation of polycrystalline diamond compacts. The polycrystalline diamond compact is composed of a hard alloy matrix layer and a polycrystalline diamond layer, the hard alloy matrix layer is made of tungsten carbide and Co and Ni adhesives, and the usage amount of Co and the usage amount of Ni account for 8.5%-10% and 1.5%-3% of the mass of the hard alloy matrix layer respectively; tungsten carbide raw materials for preparing the hard alloy matrix layer are composed of, by volume fraction, 10%-15% of coarse particle size tungsten carbide, 75%-80% of medium particle size tungsten carbide and 5%-10% of fine particle size tungsten carbide, the coarse particle size ranges from 10 micrometers to 15 micrometers, the medium particle size ranges from 2 micrometers to 8 micrometers, and the fine particle size is smaller than 1 micrometer. Co and Ni are used as adhesives of the hard alloy matrix layer, the use amount of Co and Ni is controlled, and distribution of the particle size of tungsten carbide is combined, so that the polycrystalline diamond compact has chemical corrosion resistance and wear resistance at the same time.

The invention belongs to the field of hard alloy, and particularly relates to a preparation method for improving abrasion resistance of hard alloy and the hard alloy. The preparation method comprises the following steps that S1, superfine tungsten carbide, medium-particle tungsten carbide, cobalt powder and tantalum carbide are obtained; s2, superfine tungsten carbide, tantalum carbide and cobalt powder are mixed and then subjected to first wet grinding, and first slurry is obtained; s3, medium-particle tungsten carbide is added into the first slurry for second wet grinding to obtain second slurry, and the second slurry is dried and pressed to obtain a pressed blank; and S4, the pressed blank is subjected to first sintering, and then second sintering is conducted to obtain the hard alloy. The superfine tungsten carbide is added to promote complete development of tungsten carbide grains and reduce abrasive wear, the superfine tungsten carbide and the fine-particle cobalt powder are pretreated, and the two-stage sintering process is adopted, so that uniform distribution of a cobalt phase in the sintering process is improved, the bonding strength of the tungsten carbide grains and a cobalt phase interface is enhanced, and the wear resistance of the abrasive is improved. Therefore, wear resistance of the hard alloy is improved.

The invention discloses blank pressing equipment and method for hard alloy product production in the technical field of hard alloy product production, the blank pressing equipment comprises a workbench, a lower die installed on the top of the workbench and an upper die arranged over the lower die, and when the upper die moves downwards, powder located in the lower die can be subjected to punch forming; the feeding box is horizontally and slidably mounted at the top of the workbench, and a discharging opening used for adding powder into the lower mold is formed in the bottom of the feeding box; the first sealing plate is mounted in the feeding box in a sliding manner and is used for shielding the discharging opening; the material pipe is fixedly mounted in the feeding box, one end of the material pipe communicates with the discharge port, and the other end penetrates through the top of the feeding box and extends out of the feeding box; the second sealing plate is in sliding connection with the material pipe and is arranged opposite to the first sealing plate; the first driving mechanism is mounted at the top of the workbench and used for driving the feeding box to move horizontally; the utilization rate of the raw material powder in the production process of the hard alloy product can be increased.

The invention relates to the technical field of powder metallurgy materials, and discloses a binding-phase-free hard alloy and a preparation method thereof.The binding-phase-free hard alloy comprises, by mass, 75-80 parts of WC; 8 to 12 parts of TiC; 5 to 8 parts of TaC; 3 to 5 parts of ZrC; 1.5 to 2.5 parts of HfC; 0.8 to 1.2 parts of rare earth oxide; the preparation method comprises the five key steps of core-shell structure composite powder preparation, high-energy beam melting gradient accumulation, microwave-magnetic field composite field activation, multi-stage pressure plasma sintering and staged variable-rate gradient cooling. And component gradient design is cooperated with a multi-field coupling process. Through collaborative design of a core-shell structure hard phase and a gradient composite phase, and in combination with a multi-field coupling activated sintering and gradient cooling process, the problem of obdurability balance of the non-binding-phase hard alloy is solved, the microstructure stability is optimized, and the comprehensive performance and the process controllability are improved.

The invention discloses a wear-resistant hard alloy material and a preparation method thereof, and particularly relates to the field of alloy materials.The wear-resistant hard alloy material comprises tungsten carbide, cobalt powder, graphene aerogel fragments, coconut shell carbonized porous carbon, yttrium oxide and auxiliaries, and a multi-scale reinforcing system is constructed by optimizing the proportion. According to the preparation method, supercritical drying is combined with a microwave reaction sintering process, and material densification is realized through gradient temperature control and steam concentration accurate regulation and control in a specific atmosphere. Graphene aerogel fragments and porous carbon form a three-dimensional interpenetrating network, so that the wear resistance and the conductivity are synergistically improved; yttrium oxide is segregated at a grain boundary to form a high-temperature anti-oxidation barrier; the gradient sintering process effectively eliminates internal stress and inhibits abnormal growth of grains. The technical bottleneck that wear resistance and toughness of traditional hard alloy are difficult to synergistically improve is broken through, excellent conductivity and high-temperature stability are achieved, and the industrial problems that wear resistance / toughness is inverted, a conductive network is low in efficiency, and the high-temperature stability is poor are solved.

A sintered cemented carbide includes a high-entropy carbide or a rotary knot decomposition product thereof; and a metal binder comprising at least one of Co, Co-Ru, Ni, Co-Ni, Co-Cr, Co-Ni-Cr, Co-Re, Co-Ni-Re, Co-Ni-Ru, or a high-entropy alloy wherein the high-entropy carbide is a single-phase solid solution carbide comprising four to ten metal elements, and the spin decomposition product thereof comprises two chemically different phases having the same crystal structure. The sintered cemented carbide further includes a carbide including at least one of WC, TiC, ZrC, HfC, NbC, TaC, or Cr3C2, and a metal binder; the metal binder comprises a high-entropy alloy. The high-entropy alloy is an alloy of four to ten alloy elements selected from Al, Be, Fe, Co, Cr, Ni, Cu, W, V, Zr, Ti, Mn, Hf, Nb, Mo, Ru, Re, Ge, Sn, C, B or Si.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a high-toughness hard alloy and a preparation method and application thereof.The preparation method comprises the steps that tungsten powder is subjected to high-energy ball milling, and then treated tungsten powder is obtained; the preparation method comprises the following steps: dissolving water-soluble lanthanum salt, cerium salt and chromium salt, and performing spray drying to obtain La-Ce-Cr composite powder; the treated tungsten powder, titanium dioxide powder, cobalt powder, La-Ce-Cr composite powder and carbon powder are mixed, and mixed powder is obtained; sintering the mixed powder to obtain alloy powder; the tungsten carbide and the alloy powder are flexibly mixed, and a mixture is obtained; and pressing and sintering the mixture to obtain the high-toughness hard alloy. The high-toughness hard alloy is a plate-shaped crystal hard alloy and is uniform in organization structure, the hardness HV10 is larger than or equal to 1620, and the fracture toughness KiC is larger than or equal to 24 MPa.m < 1 / 2 >.

The invention provides a preparation method of a wear-resistant and strength-coordinated hard alloy product. The method comprises the following steps: (1) hard phase pretreatment: mixing tungsten carbide powder with a yttrium-stabilized zirconia precursor solution; (2) nano coating modification: placing the mixed material in a planetary ball mill for ball milling to obtain yttrium-stabilized zirconium oxide coated tungsten carbide composite powder; (3) preparing a binding phase; (4) mixing and pressing; (5) performing gradient sintering to obtain a sintered body; and (6) the sintered body is placed in a vacuum furnace to be subjected to aftertreatment, and the wear-resistant and strength-coordinated hard alloy product is obtained. Through multi-dimensional innovation of material proportion innovation, process optimization and equipment improvement, the technical problems of traditional hard alloy in the aspects of hardness and toughness balance, high-temperature performance stability, production cost control and the like are successfully solved, and a hard alloy solution which is excellent in performance and economical and feasible is provided for the field of high-end equipment manufacturing.

The utility model discloses a rotary positioning detection mechanism for an aluminum profile machining clamp, which comprises a rotary pressing plate main body, one side of the rotary pressing plate main body is provided with a positioning support, a rotary oil cylinder and a copper pressing plate, one side of the rotary oil cylinder is provided with the positioning support, and one side of the rotary pressing plate main body opposite to the rotary oil cylinder is provided with a locking nut. Part clamping and copper pressing plate in-place detection are conveniently achieved, meanwhile, pressing damage to raw materials in the aluminum profile machining process is avoided, machining of all machining elements of the part can be completed after blank datum plane positioning, and then machining of the blank datum plane is completed through a hard alloy milling cutter in one-time clamping.

The invention relates to a hard alloy micro-texture tool based on discharge plasma pressureless sintering and a preparation method. Comprising the following steps: preparing a micro-texture male die pressing head; wC-Co mixed powder is obtained; the pressure head in the step (1) is adopted to apply 150-180 MPa pressure to the WC-Co mixed powder, the pressure is maintained for 60 min, and a biscuit is obtained after demolding; putting the biscuit into a graphite mold, assembling the mold, carrying out vacuum pressureless sintering on the biscuit, heating to 1300-1400 DEG C at the heating rate of 90-110 DEG C / min, carrying out heat preservation for 10 + / -2 minutes, and then cooling to room temperature along with a furnace to obtain a hard alloy block with a micro-texture on the surface; and the micro-texture surface of the hard alloy block is only polished to be bright. According to the method, thermal damage and fusion edge collapse are thoroughly avoided, and high-precision, namely high geometric fidelity, high efficiency, namely short sintering period and low-cost preparation of the microstructure is realized.

The invention discloses a laser additive manufacturing double-layer structure gradient hard alloy cutter and a manufacturing method, the alloy cutter comprises a base body, a transition layer and a surface layer, and the transition layer is arranged between the base body and the surface layer; the base body and the transition layer are both made of WC-Co particles, and the surface layer is made of WC-TiC-TaC-Co particles; the grains of the substrate and the surface layer are smaller than those of the transition layer. The manufacturing method comprises the following steps that spherical hard alloy particles are obtained through an atomization pre-sintering granulation method; technological parameters and environmental parameters of selective laser melting are optimized; the substrate, the transition layer and the surface layer are sequentially formed through selective laser melting printing; and the double-layer structure gradient hard alloy cutter is obtained. By optimizing the atomization pre-sintering granulation method and the laser additive manufacturing process, the high-density, high-precision and high-performance gradient hard alloy cutter with the double-layer structure can be prepared.

The invention belongs to the technical field of hard alloy manufacturing, and particularly relates to a superfine hard alloy cutter material for high-temperature material processing and a preparation method of the superfine hard alloy cutter material. A composite hard phase formed by modified tungsten carbide and lanthanum modified tungsten carbide is selected, graphene-nickel composite powder is introduced into a binding phase high-entropy alloy to form a composite material, the superfine hard alloy cutter material for high-temperature material machining is prepared, the Vickers hardness of the material is improved, the fracture toughness is improved, and the service life of the material is prolonged. And good bending strength is obtained.

The utility model relates to the technical field of air conditioner outdoor unit chassis stamping dies, and provides a precise cutting and positioning stamping die for an air conditioner outdoor unit chassis, which comprises a die frame, an upper die table, a lower die table, a positioning component and a motion measuring component, an assembling plate is installed on the top of the upper die table, plate grooves are formed in the two sides of the top of the assembling plate correspondingly, transverse grooves are formed in the front portions and the rear portions of the top ends of the plate grooves correspondingly, threaded rods are slidably arranged in the transverse grooves correspondingly, hard alloy pieces are welded to the bottom ends of the threaded rods correspondingly, and the threaded rods are fixed to the assembling plate through nuts correspondingly. And hard alloy sheets are used for cutting pressing material veneers left on the edges of the two sides of the punched air conditioner outdoor unit chassis. When the device is used, the resistance value change is generated between the resistance block I and the resistance block II by utilizing the motion measuring assembly and utilizing the principle that the resistance block II and the resistance block I are far away from each other, so that the inclination angle of the upper die table is judged according to the resistance value, and the detection accuracy is higher.

The invention relates to a superfine hard alloy cutter and a preparation method thereof, and belongs to the technical field of hard alloy products, and the preparation method comprises the following steps: carrying out ball milling and sieving on tungsten carbide powder, titanium carbide powder, modified cobalt powder and reinforced composite powder to obtain hard alloy powder; and the hard alloy powder is subjected to spark plasma sintering and then subjected to vacuum heat treatment, and the superfine hard alloy cutter is obtained. According to the technical scheme, a vanadium source, a yttrium source and a cobalt source are mixed through a spray conversion method to prepare modified cobalt powder; nano particles and a reinforcing material are combined through electrostatic adsorption to prepare reinforced composite powder; the modified cobalt powder and the reinforced composite powder not only can inhibit the growth of tungsten carbide grains, but also effectively improve the hardness, bending strength and fracture toughness of the hard alloy, further improve the mechanical property, thermal stability and wear resistance of the superfine hard alloy cutter, and generally improve the comprehensive performance of the superfine hard alloy cutter. And the service life is prolonged.

One or more embodiments of the invention relate to the field of industrial solid waste recycling, in particular to a method for preparing tungstic acid from a hard alloy waste tungsten grinding material, and the method comprises the following steps: S1, carrying out roasting pretreatment on the waste tungsten grinding material to obtain a roasted material; s2, mixing the roasted material obtained in S1 with an acidic solution, and stirring to obtain a solid-liquid mixture; s3, putting the solid-liquid mixture obtained in S2 into a high-pressure kettle; s3-1, oxidizing gas is introduced into the high-pressure kettle, and a stirring leaching reaction is carried out; s3-2, after the reaction is completed, carrying out liquid-solid separation; and S3-3, after liquid-solid separation, washing the leaching residues with hot water for 3-5 times to obtain the leaching residues which are tungstic acid solid phases and a leaching solution which is a cobalt salt solution. The problems that in the prior art, various hard alloy waste tungsten grinding material regeneration treatment technologies are tedious in technological process, large in tungsten loss, high in treatment cost and the like are solved.

The invention belongs to the field of hard alloy materials, and provides a modified high-performance non-magnetic hard alloy and a preparation process thereof. The surface of a WC particle is chemically plated with a Ni-P-B-Cr-Cu amorphous shell layer, and a binding phase is converted into Ni3P and Ni3B nanophase through two-stage sintering. The WC alloy comprises the following components in parts by weight: 85-95 parts of WC, 12-25 parts of a binding phase and 0.5-1.4 parts of a grain growth inhibitor, the nanophase accounts for 35-50% of the volume of the binding phase and 35-50% of the total volume of the binding phase, and the grain size is 80-125 nm; the average grain size of WC is 0.6-1.0 [mu] m; and the thickness of an interface P enrichment layer is 8-15 nm (the coverage rate is 85-95%). Through interface engineering and controlled crystallization from amorphous to nanocrystalline, the relative magnetic conductivity is 1.001-1.015, the hardness HRA is 90.5-93.0, the strength TRS is 2.2-3.0 GPa, the toughness KWP is 300-450 N / mm, and the magnetic saturation strength is 0.02-0.15 T. The problem of decoupling of the magnetic property and the mechanical property of a traditional non-magnetic hard alloy is solved, and the non-magnetic hard alloy is suitable for magnetic sensitive environments such as semiconductor equipment, precise measurement, MRI tools and oil service logging.

The invention discloses a DLC coating with a gradient composite structure and a surface microstructure and a preparation method of the DLC coating, and belongs to the technical field of hard alloy tool surface treatment. The coating comprises a transition layer, a DLC gradient layer and a laser microstructure layer arranged on the outer surface of a DLC main coating, the transition layer is composed of Cr layers and CrN layers which are alternately stacked; the sp3 bond content of the DLC gradient layer is gradually increased in the direction from the transition layer to the outer surface of the DLC gradient layer, and the W element content in the DLC gradient layer is gradually decreased in the direction from the transition layer to the outer surface of the DLC gradient layer; the laser micro-texture layer is composed of a hexagonal honeycomb-shaped densely-arranged pit array. The coating system has the characteristics of high interface bonding strength and ultralow friction, and the service life of the hard alloy cutter can be remarkably prolonged when the coating system is applied to the surface of the hard alloy cutter.