837 results about "Tungsten carbide" patented technology

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 invention relates to the technical field of flux-cored wires. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 4-6 parts of chromium carbide powder, 7-9 parts of molybdenum powder, 6-8 parts of nickel powder, 10-15 parts of niobium powder, 15-18 parts of tungsten carbide powder, 7-11 parts of a modified titanium carbide agent, 5-8 parts of a blending agent added based on boron and 2-4 parts of 30-mesh natural graphite; 1-2 parts of sodium fluosilicate; 1-2 parts of aluminum powder; and 70-75 parts of iron powder. The flux-cored wire can adapt to complex service environments of parts such as rollers and continuous casting crystallizers in the metallurgical industry, the service life of the parts subjected to surfacing repair is prolonged, the production efficiency of the parts subjected to surfacing repair is improved, the obtained flux-cored wire achieves balance of high-temperature performance, mechanical performance and low-temperature stability, and the comprehensive applicability of products is improved.

The invention relates to the technical field of electrode paste, in particular to a preparation method of high-pressure-resistant high-strength graphite enhanced electrode paste, which comprises the following steps: sequentially performing oxidation modification and silane modification on crystalline flake graphite powder, preparing silane modified graphite powder, and synchronously preparing a boron-nitrogen source precursor; coating the aminated carbon quantum dots with silicon to obtain silicon-coated carbon quantum dots; preparing a composite adhesive, a tungsten carbide-aluminum nitride composite reinforced phase and carbon-plated silicon powder; the preparation method comprises the following steps: blending and kneading silane modified graphite powder, a boron-nitrogen source precursor and other components, and pressing under gradient pressure to obtain a green body; and performing segmented roasting on the green body, and cooling to obtain the target electrode paste. According to the invention, crystalline flake graphite oxidation-silane modification is adopted to optimize interfacial compatibility, silicon-coated carbon quantum dots are adopted to reinforce a bonding system, a composite reinforcement phase is adopted to construct a mechanical support network, boron-nitrogen source in-situ doping supplemental reinforcement is adopted, and gradient pressure pressing and segmented roasting are combined to ensure that the structure is compact. The normal-temperature compressive strength, high-temperature mechanical stability and compactness of the electrode paste are improved through the synergistic effect of all links, and the electrode paste can stably adapt to the high-temperature and high-load working conditions.

The invention relates to the technical field of diamond saw blades, in particular to a laser welding diamond saw blade for ultra-narrow slit cutting and a preparation method of the laser welding diamond saw blade. The copper-cobalt-tin alloy material comprises the following raw materials: copper-cobalt-tin alloy powder, tungsten carbide powder, titanium-aluminum nitride, spherical cobalt powder, rare earth yttrium powder, ferrophosphorus powder and diamond abrasive particles. According to the preparation method, the core of the preparation method lies in the combination of powder metallurgy prefabrication of the tool bit and the precise laser welding process, especially the innovative laser welding process, and the prepared diamond saw blade is high in welding seam strength, narrow in heat affected zone and extremely small in matrix deformation; the problems of base body deformation, insufficient welding seam strength, short service life and the like of a traditional saw blade in the ultra-narrow seam cutting process are solved, and the saw blade is perfectly suitable for ultra-narrow seam cutting scenes with extremely high requirements for precision and stability.

The invention relates to the field of tungsten carbide, and provides a preparation method of wear-resistant tungsten carbide powder in order to solve the problem that it is difficult for existing tungsten carbide to ensure high compactness while ensuring high wear resistance of a coating, and the preparation method comprises the steps that S100, by weight, tungsten carbide, cobalt powder, polyethylene glycol and alcohol are put into a ball mill to be subjected to ball milling, and slurry is obtained; s200, granulating the slurry through an atomization drying tower to obtain mixed powder; s300, sintering the mixed powder to obtain a powder block; s400, the powder blocks are made into wear-resistant tungsten carbide powder through a dry grinding machine; the tungsten carbide comprises 25 wt%-35 wt% of a first component, 28 wt%-32 wt% of a second component and the balance of a third component. The average particle size of the first component is 0.4-0.6 [mu] m, the average particle size of the second component is 0.9-1.2 [mu] m, and the average particle size of the third component is 2.5-2.8 [mu] m; the polyethylene glycol comprises a polymer of which the molecular weight distribution is 2000-20000, and the polymer of which the molecular weight distribution is 15000-20000 accounts for 50%-60%. Through grading of the tungsten carbide raw material, after the prepared tungsten carbide powder forms a coating, the coating has the characteristics of wear resistance and high compactness.

The invention relates to the technical field of material science, and discloses a slurry valve erosion-resistant multi-layer coating with gradient function design and a preparation method thereof.The coating comprises a bonding layer, a gradient function layer and an erosion-resistant surface layer which are sequentially arranged from inside to outside, the bonding layer is composed of nickel-based alloy or cobalt-based alloy, the thickness of the bonding layer is 50-100 micrometers, and the thickness of the gradient function layer is 50-100 micrometers. The gradient functional layer is made of composite powder of metal and ceramic, the metal is nickel or cobalt, the ceramic is tungsten carbide or chromium carbide, and the components of the gradient functional layer are from the bonding layer side to the erosion-resistant surface layer side; the bonding layer is arranged and forms firm metallurgical bonding with the matrix, the interface stress is reduced, the basic reliability of bonding of the coating and the matrix is guaranteed, meanwhile, the gradient functional layer with the metal and ceramic volume fraction gradually changing continuously is adopted, the problem that the thermal expansion coefficients of the coating and the matrix are not matched is solved, and the service life of the coating is prolonged. And the crack initiation and expansion risk caused by internal stress concentration is reduced, so that the long-term stability of the coating structure is ensured.

The present invention provides a process of forming a cutting tool comprising the steps of: additive deposition of a tool material comprising at least one of: tungsten carbide, TaNbC, a tungsten carbide containing alloy or composite, or a TaNbC containing alloy or composite onto a base substrate having a longitudinal axis, said tool material being deposited onto the base substrate to form a deposit body configured to form at least one cutting formation therein; and subsequently subtracting selected portions of the deposit body to produce at least one cutting formation having a selected cutting edge configuration, thereby forming the cutting tool.

The invention relates to the technical field of metal material surface strengthening and modification, in particular to a preparation method and process of a titanium alloy laser cladding cobalt-based wear-resistant coating. The invention provides a titanium alloy surface laser cladding cobalt-based wear-resistant coating which takes titanium or a titanium alloy as a base material, comprises the following components in percentage by weight: 40-50% of cobalt (Co), 30-40% of tungsten carbide (WC), 10-15% of chromium (Cr), 1-5% of lanthanum hexaboride (LaB6), 2-5% of silicon (Si) and 0.5-3% of calcium fluoride (CaF2), and has the beneficial effects of improving wear resistance, high-temperature stability, corrosion resistance, high hardness, high bonding strength, difficulty in cracking and the like.

The application relates to the technical field of superhard materials, and discloses a non-magnetic polycrystalline diamond compact as well as a preparation method and application thereof. The non-magnetic polycrystalline diamond compact comprises a nickel-based hard alloy base and a polycrystalline diamond layer combined on the nickel-based hard alloy base; wherein the nickel-based hard alloy base comprises nickel and tungsten carbide, and the polycrystalline diamond layer comprises nickel and diamond micro powder. The non-magnetic polycrystalline diamond compact of the application uses a nickel-based hard alloy base, and the polycrystalline diamond layer uses nickel as a bonding phase, so that the magnetism of the polycrystalline diamond compact is effectively reduced, and the application requirement of a non-magnetic bearing material can be met.

The steel wire rope comprises an independent steel wire rope core, an inner-layer rope strand and an outer-layer rope strand from inside to outside, and the twisting directions of the inner-layer rope strand and the outer-layer rope strand are opposite to achieve rotation resistance. The outer-layer rope strand adopts a surface contact structure formed by a round core wire and a Z-shaped special-shaped steel wire, and a composite coating which takes nickel-phosphorus alloy as a matrix and is provided with tungsten carbide particles in a dispersed manner is arranged on the surface of the steel wire of the outer-layer rope strand. And meanwhile, the rope core and the inner-layer stranded steel wires adopt zinc-aluminum-magnesium alloy coatings. The preparation method comprises the key steps of steel wire coating treatment, stranding, reverse rope combining, pre-tensioning, pressurizing and lubricating and the like. By combining the unique structure, material and process, the problems of insufficient wear resistance and corrosion resistance and unstable structure in the prior art are comprehensively solved, the service life of the steel wire rope is remarkably prolonged, the safety performance of the steel wire rope is remarkably improved, and the steel wire rope is particularly suitable for severe working conditions such as heavy hoisting and ocean engineering.

The invention discloses a cleaning method and a cleaning system for a deposition chamber. The cleaning method comprises the following steps that dissociated NF3 is introduced from the top of a cavity so as to at least clean tungsten residues in the upper half area in the cavity for one time; stopping introducing the dissociated NF3, and introducing dissociated O2 from the top of the chamber so as to at least clean the carbon residues in the upper half area for one time; and dissociated NF3 is introduced from the top and the bottom of the cavity at the same time, so that the tungsten residues and the carbon residues in the upper half area and the lower half area in the cavity are subjected to secondary cleaning. By executing the steps, the problem that the cleaning effect on the carbon residues in the chamber is poor due to combination of nitrogen plasma and oxygen plasma caused by simultaneous dissociation and introduction of NF3 and O2 into the chamber can be solved, so that the cleaning effect on the carbon residues is improved, the cleaning time is shortened, and the cleaning efficiency is improved. And the process effect and the process stability of the tungsten carbide thin film in the chamber are further improved.

The invention relates to the technical field of flux-cored wires, and discloses a high-rust-resistance flux-cored wire preparation method which comprises the following steps of S1, raw material pretreatment, S2, powder adding and forming, S3, surface modification and S4, finished product inspection. Before work is started, a worker prepares raw materials including high-carbon ferrochrome, tungsten carbide, boron carbide, rare-earth metal oxide and ferromolybdenum powder, then grinding equipment is used for grinding the raw materials, then the ground powder is dried for 2-3 hours through equipment at the temperature of 100-150 DEG C, the dryness of the raw materials is guaranteed, and the raw materials are evenly mixed. The method comprises the following steps: firstly, preparing a flux-cored wire, then uniformly stirring by utilizing three-dimensional mixing equipment, and then mixing and proportioning according to different proportions according to a corrosion-resistant flux-cored wire, an acid-base-resistant flux-cored wire and a high-hardness high-temperature-resistant flux-cored wire, so that the welding wires with corresponding properties can be conveniently used according to different environments, and the maximization of the functionality of the welding wire is improved.

The present disclosure relates to the technical field of powder metallurgy, especially to a coarse grain cemented carbide and a preparation method thereof. Pseudo particles in coarse grain tungsten carbide are removed by pretreating process. Broken of the coarse grain tungsten carbide in traditional wet milling is avoid by solid-liquid stirring, spay granulating and surface covering, which also guarantee the uniform distribution of PEG and cobalt salt. Transformation from cobalt salt to cobalt is safely and effectively guaranteed by performing two sintering stages with different atmosphere and temperature to obtain a WC—Co mixture material. By performing spark plasma sintering process, the precipitation of nano fine grain tungsten carbide guarantees regrowth of defect occurred in pretreating process. The coarse grain cemented carbide with the average grain size of WC above 10 μm, the uniform cobalt phase distribution and be bending strength not less than 2200 MPa is prepared.

Provided is a cemented carbide composition having a hard phase made of tungsten carbide (WC) as a first hard phase component and at least one second hard phase component selected from the group consisting of tantalum carbide (TaC), niobium carbide (NbC), and mixtures thereof, and a binder phase made of at least one binder component selected from the group consisting of cobalt (Co), nickel (Ni), and mixtures thereof. Also provided is a cemented carbide composition having a hard phase made of WC as a hard phase, NbC as an anti-galling phase, and TaC as a toughness improver, and a binder phase made of at least one binder component selected from the group consisting of Co, Ni, and mixtures thereof. Associated methods of producing the cemented carbide compositions and tools incorporating the same are additionally contemplated.

The invention relates to a core-shell structure whisker toughened hard alloy. The core-shell structure whisker toughened hard alloy comprises a hard alloy matrix and a core-shell structure whisker, the core-shell structure whisker comprises a tungsten core part and an outer tungsten carbide shell layer. According to the core-shell structure whisker toughened hard alloy provided by the invention, the core-shell structure whiskers are added into the hard alloy, and the obdurability of the hard alloy is improved by utilizing the obdurability of the tungsten core part; the outer tungsten carbide shell layer is utilized, the hardness of the whisker is improved, the carbon content of a hard alloy system can be balanced in the sintering process, the wettability between the whisker and a hard alloy matrix is improved, sintering densification is promoted, and the interface bonding force between the whisker and the hard alloy matrix is improved. And finally, the strength and toughness of the hard alloy are improved on the premise of not obviously reducing the hardness of the hard alloy.

The invention relates to the technical field of diamond saw blades, and provides a diamond saw blade and a preparation method thereof. The diamond saw blade comprises a disc base body and a tool bit fixed to the periphery of the disc base body, and the tool bit is prepared from, by weight, 30-45 parts of iron powder, 15-25 parts of copper powder, 8-12 parts of nickel powder, 8-15 parts of cobalt powder, 3-5 parts of tin powder, 2-5 parts of molybdenum powder, 1-3 parts of silicon-boron alloy powder, 0.5-2 parts of tungsten carbide powder, 20-25 parts of diamond particles and 0.05-0.1 part of liquid paraffin. According to the diamond saw blade provided by the invention, the scientificity and the accuracy of proportion matching of all the components in the raw material formula of the tool bit are improved, the stability of the sintering process is improved, and the condition that the hardness and the toughness of the tool bit are difficult to achieve the optimal balance is improved.

The invention discloses a preparation method of a high-quality solid welding wire. The preparation method comprises the following steps of S1, raw material selection and pretreatment, S2, a drawing forming process, S3, surface treatment, S4, aftertreatment and finishing, S5, quality detection and control and S6, packaging and storage. Before work starts, raw materials are selected, low-carbon steel is selected, the purity of S is controlled to be smaller than or equal to 0.010%, the purity of P is controlled to be smaller than or equal to 0.015%, the size is controlled to be phi 5.5-6.5 mm, then oxide skin is removed through sulfuric acid for 5-10 min, after flushing is conducted through high-pressure water, residual acid is neutralized through alkali liquor, corrosion is prevented, then hot air drying is conducted at the temperature of 100-120 DEG C, it is guaranteed that no water exists on the surface, and the low-carbon steel is obtained. According to the method, the raw materials are pretreated, so that the cleanliness of the raw materials is improved, the production quality of the thick solid welding wire is improved, then the raw materials are smelted after being pretreated, and then a mixture of rare earth, deoxidized silicon, alloy vanadium and copper phosphorus tungsten carbide is added according to different environment requirements so as to increase the variety of the welding wire.

The invention provides a high-wear-resistance and corrosion-resistance valve ball valve seat and a preparation method thereof, and belongs to the technical field of alloy materials. The valve ball and valve seat comprises, by mass, 70%-85% of tungsten carbide, 5%-23% of cobalt, 2%-10% of nickel, 5%-10% of composite reinforced particles and 0.5%-2% of microelements. The composite reinforced particle comprises a core, a transition layer and a shell layer, the core comprises a high-entropy carbide solid solution, the transition layer is a carbide layer, and the shell layer comprises a nano composite structure layer. According to the high-abrasion-resistance and corrosion-resistance valve ball valve seat, through the synergistic effect of all the components, the defects that a traditional valve ball valve seat is prone to being abraded and damaged are overcome, in the application of components such as a valve ball and a valve seat in oil exploitation equipment, the high-abrasion-resistance and corrosion-resistance valve ball valve seat can better adapt to severe exploitation conditions, the service life of the components is prolonged, and the maintenance cost of the equipment is reduced; the method has wide application prospects and remarkable economic benefits.

This invention provides nano-tungsten carbide and its preparation method, belonging to the field of nanopowders. The method for preparing nano-tungsten carbide includes the following steps: gaseous tungsten oxide (after vaporization) is passed into an organic solvent to obtain a dispersion of nano-tungsten oxide; the dispersion is mixed with a building agent and dried, allowing the nano-tungsten oxide to enter the interior of carbon nanotubes, resulting in a building material; the building agent includes carbon nanotubes; the building material is then subjected to reduction carbonization to obtain the nano-tungsten carbide. This invention utilizes the high activity of nano-tungsten oxide prepared by sublimation, enabling rapid adsorption into the interior of carbon nanotubes, thereby achieving the preparation of the building material; furthermore, after the nano-tungsten oxide is introduced into the carbon nanotubes, the carbon nanotubes restrict the growth of powder particles during the reduction carbonization process, achieving controllable powder size.

The invention discloses a high-thermal-conductivity copper-based composite material for heat dissipation and a preparation method thereof, and relates to the technical field of composites.The preparation method comprises the steps that graphene-tungsten graded coated diamond reinforced powder and spherical copper powder are mechanically mixed in a planetary ball mill, and uniform composite powder is obtained; and the uniform composite powder is loaded into a mold, curing forming is conducted in a vacuum environment through a spark plasma sintering technology, a diamond-tungsten carbide-tungsten-copper gradient interface structure is generated in situ in the sintering process, and the high-heat-conductivity copper-based composite material for heat dissipation is obtained. According to the invention, high thermal conductivity and low thermal expansion are realized by constructing a gradient interface, the thermal cycle reliability is improved by introducing a flexible layer, and the composite material with highly consistent performance is prepared by combining self-adaptive process regulation and control, so that the technical problems of high interface thermal resistance and unstable performance are solved.

The application discloses a kind of hard alloy cutter materials for deep hole machining, the cutter material is composed of the following weight percentage components: tungsten carbide: 75%~85%, wherein 0.2~0.4 μm superfine tungsten carbide particles account for 60%~80%, 0.4~0.8 μm tungsten carbide particles account for 20%~40%; Cobalt: 10%~15% titanium carbide: 2%~5%; Tantalum carbide: 1%~3%; Niobium carbide: 0.5%~2%; Vanadium carbide: 0.3%~1.0%; Chromium carbide: 0.2%~0.8%; Rare earth element: Y2O3 Or La2O3: 0.1%~0.5%. The application breaks through the bottleneck of high temperature wear, insufficient strength and short service life of traditional hard alloy in deep hole machining through three-dimensional innovation of component design, structure control and surface strengthening, and provides an efficient solution for precision deep hole machining of high hardness materials.

The invention belongs to the technical field of powder metallurgy materials, and particularly relates to a high-toughness ultra-fine grain WC-Co hard alloy and a preparation method thereof.The preparation method comprises the following steps that S1, ultra-fine grain tungsten carbide powder, nanocrystalline tungsten carbide powder, cobalt powder and a grain inhibitor are obtained to serve as raw materials, the ultra-fine grain tungsten carbide powder and the nanocrystalline tungsten carbide powder are subjected to ultrasonic dispersion, vacuum reduction and spray drying, and then composite tungsten carbide powder is obtained; s2, cobalt powder and a grain inhibitor are mixed and then subjected to first ball milling to obtain a first mixed material, the first mixed material and composite tungsten carbide powder are mixed and then subjected to second ball milling to obtain a second mixed material, and the second mixed material is subjected to third ball milling to obtain a third mixed material; and S3, drying, pressing, sintering and cooling the third mixture to obtain the hard alloy. By optimizing the ball milling process and the sintering process and adopting the novel dispersing agent and the grain inhibitor, the fracture toughness and the bending strength of the material can be remarkably improved while high hardness can be guaranteed.

The invention relates to the technical field of nano repair materials, in particular to a ship remanufacturing nano repair material and a preparation method and application thereof, and the nano repair material comprises the following raw materials in parts by weight: 30-35 parts of nano tungsten carbide, 25-30 parts of nano titanium carbide, 25-30 parts of nano silicon carbide, 10-15 parts of modified boron nitride powder and 6-9 parts of a carbon nanotube doping-based additive. According to the nano repairing material, nano tungsten carbide, nano titanium carbide and nano silicon carbide are blended to serve as a base body, meanwhile, the added modified boron nitride powder and the added carbon nano tube doped increasing agent are mutually blended, matched, optimized and improved, and the obtained nano repairing material product has excellent wear resistance, impact resistance and pollution resistance; the performance of the product can be harmoniously improved, and the heat-resistant, corrosion-resistant and stable effects of the product are remarkable.

The invention discloses a high-corrosion-resistant and wear-resistant tungsten-based hard alloy and a preparation method thereof, and relates to the technical field of hard alloys. The high-corrosion-resistant and wear-resistant tungsten-based hard alloy is composed of tungsten-based composite oxide and molybdenum disulfide boron nitride hybrid nanofibers and graphene coated core-shell composite powder. Tungsten-based composite oxide and molybdenum disulfide boron nitride hybrid nanofibers and graphene-coated core-shell composite powder are subjected to high-temperature sintering, the interface bonding performance of the nanofibers and the graphene-coated core-shell composite powder is enhanced in a physical anchoring and chemical bonding mode, defects are reduced, external stress is effectively transmitted, the barrier protection effect can be enhanced, permeation of a corrosion medium is fully isolated, and the corrosion resistance of the corrosion medium is improved. And a multi-scale lubricating system is also constructed, and the abrasion of substances such as tungsten carbide and cobalt is reduced, so that the bending strength, the corrosion resistance and the abrasion resistance are remarkably enhanced, the use performance of the tungsten-based hard alloy is optimized, and the service life of the tungsten-based hard alloy is prolonged.

The LNTPI is a surgical instrument used to cut through fibrotic and edematous tissue to define the natural tissue plane of dissection. After defining the natural tissue plane, it is designed to move or carefully insinuate tissues along these natural planes without cutting the tissue, so that targeted organs or parts thereof could be viewed and reached during laparoscopic procedures. The following features make the LNTPI unique compared to standard blunt dissectors used in laparoscopy: 1. The tip of the LNTPI is coarse and not smooth. The tip has diagonal, spiral ridges from the sides which are carried onto the tip converging as a single spiral at the center of the tip, creating a pattern resembling that of a screw; 2. The ridges of the LNTPI are comprised of asymmetrical triangular ridges with an acute angle at the apex that may be leaning along with or against the rotation of the spiral; 3. The tip of the LNTPI is made of tungsten carbide metal instead of stainless steel; 4. Dissection can be done in the usual up, down, left, and right motions as standard dissectors; 5. The side of the LNTPI can be used to "peel" tissue by using the ridges on its side combined with a twisting movement. This maneuver cannot be performed using standard dissectors; and 6. The tip of the LNTPI can perform circumferential dissection when used with a twisting movement causing it to engage tissue like a "drill" along the natural tissue plane. The ridges that converge into a single spiral at the tip of the invention appear like a screw and with the proper twisting movement have a similar effect on tissue. Because of the texture, design, and material used for the tip of the LNTPI, it has the following advantages over standard dissectors: The LNTPI can engage tissues more easily even if the tissues are slippery due to the presence of blood or fluids. The LNTPI can be used to engage tissues through a twisting motion which motion allows the tissues to be engaged in a specific manner that defines natural tissue dissection planes. The LNTPI can insinuate / "peel" tissue by using the side spiral ridges in combination with a twisting movement. The LNTPI can perform circumferential dissection by using the tip and the convergence of the spiral ridges at the center of the tip in combination with a twisting movement. The transfer of lateral shear force to the tissue at various angles (45, 90, and 180 degrees) when using the LNTPI is significantly higher whether the motion is by a sweeping motion or twisting of the instrument, allowing it to insinuate better than standard instruments, especially in a wet field. Hand movements needed in insinuating tissue using the LNTPI are different from the usual hand movements when using standard dissection instruments. The hand movements in using LNTPI require less muscular effort and repetitiveness, thus preventing muscle fatigue and repetitive use injury among surgeons. The instrument is reusable, as compared to dissectors that have fabric at the tip, which must be disposed of and replaced once the fabric tip fully absorbs the blood or other fluid in the wet tissue surface.

The invention belongs to the technical field of alloys, and particularly provides an ultra-coarse hard alloy and a preparation method thereof.The preparation method comprises the steps that solid raw materials including tungsten carbide powder and cobalt powder are subjected to wet ball milling and drying, and a mixture is obtained; carrying out compression molding on the mixture to obtain a pressed blank; and then the pressed blank is sequentially subjected to low-temperature oscillation pressurization, pre-sintering and oscillation pressurization sintering treatment. The WC-Co alloy prepared through the method has ultra-coarse grains, the size and distribution of tungsten carbide grains in the alloy can be effectively controlled through the method, the distribution uniformity of a binding phase can be improved, and the prepared ultra-coarse hard alloy has high hardness and strength.

The invention provides a precursor powder manufacturing method, a ceramic part manufacturing method and a ceramic part. The preparation method of the precursor powder comprises the following steps: obtaining pure ceramic powder as a raw material; carrying out ball milling on the raw materials by adopting tungsten carbide grinding balls to obtain primary precursor powder; wherein the ball milling process comprises a first ball milling stage and at least one second ball milling stage; the ball milling speed of the first ball milling stage is smaller than that of the second ball milling stage; and sieving the primary precursor powder to obtain the precursor powder. By utilizing the characteristics of high hardness, high wear resistance and high density of the tungsten carbide material, the raw material is subjected to ball milling, so that the volume of the grinding ball can be as small as possible under the condition that the weight of the tungsten carbide grinding ball is enough to crush the raw material particles, and the grinding ball can be in full contact with the raw material particles, so that the grinding efficiency is improved. The granularity of raw materials is as small as possible within a certain ball milling time, and the time required by the ball milling step can be shortened.

The invention relates to the technical field of hard alloys, and particularly discloses a ruthenium boride reinforced ultra-ultra coarse grain WC-Co hard alloy and a preparation method thereof in order to solve the problems of low strength and hardness and poor toughness of an ultra-ultra coarse grain alloy product caused by difficult control of grain size in an existing ultra-ultra coarse grain alloy preparation process. The ultra-coarse grain WC-Co hard alloy comprises the following raw materials: 0.5-5% of ruthenium-boron mixed powder, 5-10% of cobalt powder and the balance of tungsten carbide particles. Wherein the number ratio of ruthenium atoms to boron atoms in the ruthenium-boron mixed powder is 1: (0.5-1.5), and the carbon adjusting range of the total mass of tungsten and carbon in the tungsten carbide particles is 6.08-6.20 wt%. The problems that WC particles are excessively crushed and Co phases are non-uniformly distributed are solved by utilizing high-energy stirring dry mixing without adding a grinding body and combining a flexible wet grinding process with extremely short time and extremely low ball-to-material ratio, and Ru powder and B powder are introduced and combined with a special sintering process, so that the effects of high toughness, high hardness, high heat conductivity and the like of the ultra-coarse grain alloy are achieved.

The invention belongs to the technical field of drill bits, particularly relates to a special drill bit for a honeycomb aluminum plate, and aims to solve the problems that when an existing drill bit is used for machining a honeycomb aluminum material, the machining precision and the surface quality are often difficult to guarantee, and meanwhile, the machining efficiency is low. The drill bit head is connected to one end of the drill bit main body; the main cutting edge is arranged on the drill bit head; the first auxiliary blade and the second auxiliary blade are both arranged on the drill bit head and used for trimming cutting edges, the outer side of the drill bit head is coated with a wear-resistant coating, and the wear-resistant coating is a composite coating composed of titanium nitride and tungsten carbide. By means of the combined design of the stepped main cutting edge, the first auxiliary edge and the second auxiliary edge and the optimized geometric parameters and wear-resistant coating technology, efficient and accurate machining of the honeycomb aluminum material is achieved, machining defects are reduced, and machining quality and efficiency are improved.

The utility model discloses corrugated paper with a flame-retardant effect, which comprises a corrugated paper body, the corrugated paper body comprises core paper, surface paper is arranged at the top of the core paper, an upper flame-retardant layer is arranged at the top of the surface paper, the upper flame-retardant layer comprises a tungsten carbide coating and an aluminum oxide coating, bottom paper is arranged at the bottom of the core paper, and a flame-retardant layer is arranged at the bottom of the bottom paper. A lower flame-retardant layer is arranged at the bottom of the bottom paper and comprises a polyvinyl chloride coating and a polytetrafluoroethylene coating, the tungsten carbide coating is coated at the top of the surface paper, the aluminum oxide coating is coated at the top of the tungsten carbide coating, and the thickness of the tungsten carbide coating is the same as that of the aluminum oxide coating. The upper flame-retardant layer is arranged, the aluminum oxide coating contained in the upper flame-retardant layer can be used for carrying out first-layer flame-retardant protection treatment on the surface paper, and the tungsten carbide coating can be used for carrying out second-layer flame-retardant protection treatment on the surface paper after the aluminum oxide coating is damaged, so that the overall fire resistance of the surface paper is effectively improved.