118 results about "Carbide coating" patented technology

According to the graphene fiber heat conduction enhanced high-temperature-resistant composite material and the preparation method thereof, graphene fibers are adopted as a substrate and can be violently activated in a high-temperature environment, a large number of nucleation sites are formed to grow a carbide coating on a surface layer, and the anchoring effect is very strong through covalent bonds between the nucleation sites and the substrate. Furthermore, the modulus of the graphene fiber is low, and in the rapid cooling process, huge thermal stress generated in the cooling process due to the fact that the thermal expansion coefficients of the fiber substrate and the carbide coating are not matched can be effectively dissipated, so that stable combination between the coating and the substrate can be guaranteed. The obtained composite material has stable interface bonding and extremely high thermal conductivity, and can be applied to a spaceflight thermal protection system.

The invention discloses a stainless steel workpiece cutting device, and relates to the technical field of stainless steel workpiece cutting, the stainless steel workpiece cutting device comprises a base, a support frame is mounted on the base, a cutting knife is provided with an assembly hole, the assembly hole is fixedly connected with a rotating shaft, the cutting knife is provided with a cutting edge part, the cutting edge part is provided with ladder flat teeth, and the ladder flat teeth are fixedly connected with the rotating shaft. A square groove is formed in the position, between the two ladder-shaped flat teeth, of the cutting edge part, the cutting knife is a hard alloy coating tool, so that the hardness and strength of the cutting knife cannot be affected by the arrangement of the square groove, the length of cuttings is shortened through the vibration assembly, the cuttings can be guided to be discharged through the cooling assembly, but the situation that the cuttings adhere to the knife cannot be avoided; the square groove is specially formed in the cutting knife, after high-temperature cuttings are generated, the high-temperature cuttings can be guided into the square groove, forced chip breaking is achieved, the situation that the cuttings adhere to the surface of the cutting blade part can be reduced through the structure, the problem of adhesion abrasion of the cutting knife is effectively solved, and the protection performance of the cutting knife is improved.

The embodiment of the invention provides an electrocardio main cable based on a multi-layer heterogeneous shielding structure and a manufacturing method of the electrocardio main cable, and relates to the field of cables. Comprising a wire core group, a composite shielding layer structure and an outer sheath, the composite shielding layer structure and the outer sheath sequentially wrap the wire core group, the wire core group comprises a plurality of twisted pairs, and each twisted pair is formed by asymmetrically twisting a signal wire and a ground wire; the composite shielding layer structure is composed of a plurality of composite shielding sections which are arranged at intervals along the axial direction of the cable, and a resistive material is filled between the adjacent composite shielding sections; the composite shielding section sequentially comprises a spiral copper foil layer, a silver polyester braid layer and an amorphous silicon carbide coating from inside to outside, and the spiral copper foil layer wraps the outside of the multiple groups of twisted pairs; and the outer sheath is coated outside the amorphous silicon carbide coating. According to the invention, broadband shielding compatibility and pure physical structure noise reduction can be realized, the noise reduction effect is improved without additional electronic components, and the cable is light and low in cost.

The embodiment of the invention provides a preparation method of a high-entropy metal carbide coating and the high-entropy metal carbide coating, and relates to the technical field of carbide.The method comprises the steps that MC carbide and Al < x > Fe < y > Co < z > X < wNiCr > high-entropy alloy powder are subjected to ball milling and mixing, and MC-Al < x > Fe < y > Co < z > X < wNiCr > metal carbide composite powder is prepared through an agglomeration sintering method; m in the MC carbide is one of Ti, Cr, W and B; melting the MC-Al < x > Fe < y > Co < z > X < wNiCr > metal carbide composite powder in a high-energy plasma melt-blowing manner, and depositing the melted MC-Al < x > Fe < y > Co < z > X < wNiCr > metal carbide composite powder on the surface of a preheated metal matrix to obtain a MC-Al < x > Fe < y > Co < z > X < wNiCr X in the MC-Al < x > Fe < y > Co < z > X < w > Ni < Cr > metal carbide composite powder comprises Ti, Mo, Si or Mn; w, x, y and z in the MC-Al < x > Fe < y > Co < z > X < w > Ni < Cr > metal carbide composite powder are respectively in a range of 0.1-1.0 at%; and the MC-Al < x > Fe < y > Co < z > X < w > Ni < Cr > coating is subjected to precipitation strengthening treatment, and the high-entropy metal carbide coating is prepared. The performance of the coating can be improved.

The invention discloses a polycrystalline composite tantalum carbide coating and a preparation method thereof, comprising the following steps: preparing a porous carbide coating on a clean substrate; cleaning and drying the porous carbide coating, mixing an inorganic tantalum salt, an alkane and hydrogen in a molar ratio of 2-5:2-5:1-2 in an inert atmosphere with argon as a carrier gas, and performing CVI deposition, wherein the pressure of the mixed gas is 5-100 mbar, the deposition temperature is 1000-1800°C, and the deposition time is 10-20 h to obtain the polycrystalline composite tantalum carbide coating.

The invention discloses a method for preparing a carbide coating with high bonding strength on a graphite surface. The method comprises the following steps: roughening the graphite surface to obtain roughened graphite, coating transition layer slurry on the roughened graphite surface, performing first sintering to obtain a transition layer, coating surface layer slurry on the transition layer surface, and performing second sintering to obtain the carbide coating. According to the preparation method, the synergistic effect of chemical bonding and mechanical embedding is achieved by optimizing the surface roughness, designing the transition layer and sintering the carbide coating, the carbide coating with the high interface bonding force is prepared on the graphite surface, and the preparation method is suitable for surface modification of graphite-based materials under the harsh working conditions of high temperature, high corrosion and the like.

The invention relates to a high-performance hafnium-based ultrahigh-temperature ceramic-based composite material and a preparation method thereof. The method comprises the following steps: depositing pyrolytic carbon on the carbon fiber surface of a carbon fiber preform through a CVD (Chemical Vapor Deposition) method; preparing a hafnium oxide interface layer on the surface of the pyrolytic carbon through an atomic layer deposition method, and performing ultra-fast annealing treatment to form a pyrolytic carbon-hafnium oxide composite interface layer; carrying out a reaction with a matrix containing a pyrolytic carbon-hafnium oxide composite interface layer through an impregnation pyrolysis method; a hafnium carbide coating is prepared on the surface of the composite material matrix through a CVD method; and preparing a hafnium oxide coating on the surface of the hafnium carbide coating through an atomic layer deposition method, and carrying out ultra-fast annealing treatment to prepare the high-performance hafnium-based ultra-high-temperature ceramic-based composite material. According to the preparation method, the pyrolytic carbon-hafnium oxide composite interface layer is prepared by adopting an atomic layer deposition process and depending on ultra-fast annealing treatment, and meanwhile, the hafnium carbide-hafnium oxide composite coating is prepared, so that the mechanical property of the composite material in a high-temperature aerobic environment is remarkably improved.

The present disclosure relates to the formation of thermal protection systems based on the formation of ceramic coatings. Such ceramic coatings may be derived from polymeric resins and may be applied over carbon-carbon (C / C) composites. The ceramic coatings may optionally contain a metal carbide coating.

The invention relates to the technical field of hard alloy coating preparation, and discloses a preparation method of a HiPIMS coating adaptive to multi-grain-size hard alloy and a hard alloy cutting tool thereof. The preparation method of the HiPIMS coating adaptive to the multi-grain-size hard alloy comprises the main steps of vacuumizing, heating and heat preservation, argon glow discharge plasma etching and cleaning, arc electron source auxiliary cleaning and activation, and metal nitride coating deposition on the surface of a base material through the high-power pulse magnetron sputtering technology. According to the preparation method disclosed by the invention, the preparation of the metal nitride coatings on the hard alloy substrates with different grain sizes is realized, and the prepared metal nitride coatings have relatively high hardness and adhesive force, so that the problem that process parameters of hard alloys with different grain sizes need to be independently optimized in the prior art is solved; and the production efficiency is improved.

An organometallic compound is provided which includes a central metal atom; and organic ligands capable of forming polydentate bonds to the central metal atom. Related methods and articles having a metal carbide coating are also provided.

The invention discloses an interpenetrating network structure tantalum carbide composite coating as well as a preparation method and application thereof, and relates to the technical field of graphite materials. Comprising the following steps: 1, preparing a carbide coating with an interpenetrating network structure on a graphite substrate; 2, cleaning and drying the carbide coating with the interpenetrating network structure, mixing inorganic tantalum salt, alkane and hydrogen according to the molar ratio of (2-5): (2-5): (1-2) in an inert atmosphere by taking argon as carrier gas, and then carrying out CVD (Chemical Vapor Deposition) under the conditions that the pressure of the mixed gas is 5-100 mbar, the deposition temperature is 1000-1800 DEG C and the deposition time is 6-10 hours to obtain the interpenetrating network structure carbide coating. The yield of the TaC coating is improved, the binding force of the coating and a substrate material is improved, and cracking of the coating is reduced.

The invention discloses a graphene-based heat conduction film with a stable interface and a preparation method of the graphene-based heat conduction film. When the graphene film is prepared, a substrate with a reticulate pattern structure with a specific size is utilized, on one hand, separation of a graphene oxide precursor film with high surface energy from a matrix is facilitated, and on the other hand, more stable nucleation sites and interlocking interfaces are provided for in-situ growth of subsequent carbides. According to the in-situ growth method, a layer of superhard carbide coating which is compact in structure and is combined through strong chemical bonds can be generated on the surface of graphene in situ, the carbide coating can form a superstable interface with graphene, the graphene film is effectively protected, and the abrasion resistance, impact resistance and space environment erosion resistance of the graphene film are greatly improved.

The invention relates to spherical high-entropy carbide powder and a preparation method of a SiC / high-entropy carbide coating. According to the method, normal-pressure carbon thermal reduction synthesis of high-entropy carbides is realized in a common box-type furnace and in an air atmosphere through a local atmosphere isolation structure of'laying graphite paper, upper graphite powder and covering activated carbon ', then a compact SiC transition layer is generated in situ on a substrate by utilizing a two-step method of'plasma spraying of a pure silicon layer and then high-temperature embedding carburization', and the high-entropy carbide is prepared. And finally, the high-entropy carbide coating is prepared through a thermal spraying method. The process is simple, the cost is low, large-scale preparation is easy, the high-temperature wear resistance and the ablation resistance of the coating can be remarkably improved, and the harsh requirements of the aerospace field and the like for the ultra-high-temperature protective coating are met.

The utility model discloses a wear -resisting alloy gear oil pump relates to gear pump technical field, including oil pump subassembly, and oil pump subassembly includes pump body, end cover, input rod, driving gear and driven gear, and driving gear and driven gear are rotationally installed in the pump body, the utility model discloses a spiral wear -resisting groove is arranged on the tooth top circle surface of gear, and the wear -resisting groove is filled with molybdenum disulfide grease, can form good lubricating effect on the contact surface of gear and other components, reduce friction and abrasion, reduce the metal scrap of abrasion simultaneously, avoid the damage of scrap to other components, in addition, wear -resisting bushing is arranged in the position corresponding to the gear outer circle of the inner wall of pump body, and wear -resisting bushing is made of high -hardness ceramic material, and the surface of side plate and gear end face contact is plated with a layer of hard alloy coating, further improved the wear resistance between each component of gear oil pump, prolonged the service life of whole gear oil pump.

The invention relates to the technical field of coated cutting tools, and provides a high-temperature wear-resistant coated cutting tool and a preparation method thereof.The high-temperature wear-resistant coated cutting tool comprises a base body and a high-temperature wear-resistant coating, and the base body is coated with the high-temperature wear-resistant coating; the matrix is a WC-based hard alloy; the coating comprises a WaAlbSicB2 bonding layer and a Ti < x > Al < y > Si < z > B2 functional layer from inside to outside, wherein the Ti < x > Al < y > Si < z > B < 2 > functional layer is of a columnar crystal layer-equiaxed crystal layer alternating structure and has a grain size, amorphous phase proportion and Al / Si element triple gradient structure in the thickness direction. A double-peak structure design is adopted in the matrix, namely coarse-grain WC constructs a framework, fine-grain WC fills gaps, and the strength and the toughness are synergistically improved through the double-peak structure design; and meanwhile, the micro-texture array is arranged on the surface of the substrate, so that the coating and the substrate form mechanical interlocking, and the film-substrate bonding strength is remarkably enhanced. The cutter has good wear resistance, good toughness, excellent film-substrate bonding strength and good high-temperature oxidation resistance, and is suitable for high-speed cutting of difficult-to-machine materials such as titanium alloy and nickel-based high-temperature alloy.

Coordination complexes are provided comprising at least one metal atom; and organic ligands comprising one or more coordination sites associating with the at least one metal atom. Related methods and articles having a metal carbide coating are also provided, the metal carbide coating being derived from one or more coordination complexes.

[Solution] Provided is a coating layer containing a hard phase, a binder phase, no more than 2.0 area% of voids, and an abnormal phase having an area ratio of 10.0 area% or less. Examples of machine components with a coating layer of this hard alloy on the surface thereof are a cutting tool, a machining tool, and a coating application device.

This invention belongs to the field of surface strengthening technology, specifically relating to a composite coating resistant to cavitation and abrasion and its preparation method. The preparation method of the composite coating resistant to cavitation and abrasion provided by this invention includes the following steps: (1) preparing a high-elasticity alloy coating on the substrate surface using laser cladding technology; (2) preparing a hard alloy coating on the surface of the high-elasticity alloy coating using flame spraying; and (3) preparing a sealing protective layer on the surface of the hard alloy coating. This method uses laser cladding technology to achieve metallurgical bonding between the high-elasticity alloy coating and the substrate, improving the bonding force between the coating and the substrate, and also has high processing precision, maintaining high quality even for thinner coatings; the hard alloy coating formed by flame spraying has high hardness and good wear resistance, further improving the cavitation and abrasion resistance of the composite coating.

The application provides a high-performance bulletproof ceramic and a preparation method thereof, and the method comprises the following steps: preparing a hard alloy coating on a metal transition layer on the surface of a ceramic base by using a supersonic flame spraying method; then, a plurality of blind hole grooves arranged in a matrix interval are opened on the surface of the hard alloy coating by using a laser etching method; then, the blind hole grooves are filled with soft metal by using the supersonic flame spraying method; after the upper surface of the soft metal in each blind hole groove is polished to be flush with the upper surface of the hard alloy coating, a hard ceramic coating is prepared on the upper surface of the hard alloy coating and the soft metal by using an atmospheric plasma spraying method. The soft metal filled in each blind hole groove of the hard alloy coating captures the broken ceramic to achieve a secondary anti-penetration effect, and the soft area formed by the soft metal and the hard area formed by the hard alloy coating make the bullet body bear uneven stress to achieve the effect of deflecting the penetration path.

The application belongs to the technical field of powder metallurgy, and particularly discloses a nanoscale oxide particle dispersed aluminum-titanium target material and a preparation method and application thereof. x The nanoscale oxide particle dispersed aluminum-titanium target material has a double-layer structure, including a plated raw material layer and a base layer. x The plated raw material layer is composed of Al, Ti and MeO, wherein the mass percentage of Al and Ti accounts for 80-95%, and the mass percentage of MeO accounts for 5-20%; and the base layer is composed of Al and Ti or pure Al. The nanoscale oxide particle dispersed aluminum-titanium target material and the preparation method and application thereof have the advantages that the aluminum-titanium target material preparation process flow is simple, the production efficiency is high, the method is economic and environmentally friendly, and the method is suitable for batch production; the aluminum-titanium target material prepared by the method solves the binding problem of brittle target material, the target material has high density, meets the demand of hard alloy coating film plating, has no cracking problem in the plating process, and has high coating hardness and good wear resistance.

The present invention is a metal carbide-coated carbon material comprising a carbon substrate having carbon as the main component and a metal carbide coating film that coats at least a portion of the carbon substrate, the metal carbide constituting the metal carbide coating film being at least one metal carbide selected from the group consisting of tantalum carbide, niobium carbide, zirconium carbide, hafnium carbide, and tungsten carbide, the chlorine concentration in the carbonized metal coating film is 25,000 ppm [mu] m or less. According to the present invention, it is possible to provide a metal carbide-coated carbon material capable of improving the yield of a semiconductor single crystal by suppressing the occurrence of a polycrystal form during crystal growth and epitaxial growth of the semiconductor single crystal.

The invention belongs to the technical field of hard alloy material preparation, and relates to a hard alloy coating blade for continuous turning of steel parts and a preparation method and application of the hard alloy coating blade. The hard alloy coating blade for continuous turning of the steel part comprises a hard alloy matrix and a multi-layer composite CVD coating deposited on the hard alloy matrix. The hard alloy matrix is prepared from the following raw materials in percentage by mass: 80.0 to 90.0 percent of WC with the Fisher particle size of 4.0 mu m, 5.0 to 8.0 percent of Co, 2.0 to 4.0 percent of (W, Ti) C, 0 to 6.0 percent of (Ta, Nb) C and 0 to 1.5 percent of Ti (C0.3 N0.7). A finer and more uniform WC grain structure can be obtained by using the (Ta, Nb) C solid solution, a stable solid solution phase is formed, and excellent high-temperature comprehensive performance, oxidation resistance and comprehensive mechanical performance are provided.

The invention belongs to the technical field of macromolecular biological materials, and particularly provides a preparation method of a polyether-ether-ketone material, which comprises the following steps: 1) pretreating polyether-ether-ketone, cleaning the surface and removing surface burrs; 2) performing surface high-temperature carbonization treatment on the pretreated polyether-ether-ketone to carbonize the surface of the polyether-ether-ketone to form a carbonized layer with a porous structure; (3) carrying out surface deposition treatment on the modified polyether-ether-ketone obtained in the step (2), and directly depositing a carbide coating on the surface of the carbonization layer with the porous structure or depositing and constructing a metal coating, a biological ceramic coating and a polymer coating on the surface of the carbonization layer; 4, the modified polyether-ether-ketone obtained in the step 3 is subjected to aftertreatment to eliminate surface residual stress, and the polyether-ether-ketone material with the high biological activity is obtained.The polyether-ether-ketone material has good biocompatibility and biological activity and can meet the clinical requirements of the medical field.

The utility model relates to the technical field of milling cutters, and discloses a high-speed high-precision hard alloy coating milling cutter which comprises a milling cutter body, a cutter bar, a fixing mechanism and a heat dissipation mechanism, the fixing mechanism is used for fixedly connecting the milling cutter body and the cutter bar, the fixing mechanism comprises a connecting block, the connecting block is integrally formed at the end, away from the cutter head, of the milling cutter body, and a connecting groove is formed in one end of the cutter bar. The connecting block at one end of the milling cutter body is connected with the connecting groove in one end of the cutter bar in an inserted mode, then a screw penetrates through the first fixing hole and the second fixing hole, so that the milling cutter body and the cutter bar are fixedly connected, cooling liquid can be guided into the connecting sleeve through the fixing pipe, and the cooling liquid can be guided into the heat dissipation groove through the liquid guide groove; and then the liquid is discharged through the liquid discharge hole formed in the milling groove of the milling cutter body, so that cuttings and heat generated in the cutting process can be quickly discharged, and the heat dissipation performance and the cutting efficiency of the cutter are improved.

The invention belongs to the technical field of steel part drilling tools, and relates to a hard alloy coating blade for drilling, which comprises a base body and a coating deposited on the base body, the matrix is prepared from the following raw materials in percentage by weight: 89 to 90 percent of tungsten carbide, 9.5 to 10.5 percent of Co and 0.4 to 0.6 percent of Cr3C2; the coating is a TiAlN / AlCrN nano composite coating formed by alternately depositing a TiAlN layer and an AlCrN layer by adopting an arc ion plating technology; 5-30 layers are alternately deposited, and the total thickness of the coating is 3.0-6.0 microns. The substrate is low in cost and has high strength and high hardness, the nano multilayer composite coating is prepared by combining the arc ion plating technology, the hardness of the film layers is improved, the binding force between the film layers is strengthened, the adhesive force is improved, the binding force between the hard alloy substrate and the coating and the crack propagation resistance of the coating are improved, and excellent drilling performance is obtained.

To provide a metal carbide coating material that can suppress deterioration in yield of growth of a single crystal when a metal carbide coating material having at least one cross section of which contour line shape is circular is used for producing a single crystal.SOLUTION: A metal carbide coating material includes: a carbon base material containing carbon as the principal component; and a metal carbide coating film that at least partially coats the carbon base material and contains a metal carbide as the principal component. The metal carbide coating material has at least one cross section of which contour line shape is circular, where the circularity of the circle is 0.01 mm or more and 1.2 mm or less.SELECTED DRAWING: None

This invention discloses a method for eliminating adsorbed carbon on the surface of a carbide coating. The method involves plasma-activating a substrate containing a defective carbide coating, then applying a repair slurry to the surface of the substrate to obtain a repair slurry layer. After drying, the sintering process yields the final product. This method can restore the surface C / M stoichiometry to 0.9-1.03 through a quantitative reaction between the applied slurry and the adsorbed carbon on the coating surface. Simultaneously, the coating becomes dense and defect-free. This method is particularly suitable for repairing coatings on graphite substrate thermal field components used in semiconductor crystal growth, and can significantly improve crystal growth quality.

The invention relates to a double-coating modified diamond heat-conducting composite material, a preparation method and application. The preparation method comprises the following steps: pretreating diamond particles for the first time; performing a first surface treatment process on the pretreated diamond particles to form metal carbide coatings on the surfaces of the diamond particles; executing a second surface treatment process on the diamond particles on which the metal carbide coatings are formed, so that electroplated metal layers are formed on the surfaces of the metal carbide coatings of the diamond particles; preparing mixed powder in a partitioned manner, obtaining partitioned powder, mixing the diamond particles with the electroplated metal layers with the partitioned powder according to different volumes, filling in a layered manner according to a filling sequence, and sintering and molding after filling, so as to prepare the modified diamond heat-conducting composite material. Nanoscale metal carbide coatings TiC layer and Cr3C2 layer are generated on the surface of the diamond through magnetic control construction plating and form covalent bond combination with the diamond, and the interface bonding strength is remarkably improved compared with that of a coating-free layer.

The application discloses a chemical vapor deposition hafnium carbide coating for repairing a tungsten cathode, and belongs to the technical field of high-temperature electrochemistry and surface engineering. The coating comprises a tungsten carbide gradient transition layer, discrete distributed hexagonal boron nitride nano-islands and a hafnium carbide deposition layer in sequence. The application adopts h-BN nano-islands as a template to induce the growth of HfC nano-pillars, forms strong nano-mechanical interlocking, combines the metallurgical bonding of the WC gradient layer, and endows the coating with super-strong bonding force and thermal shock resistance; the use of nitrogen-free hafnium source ensures the low nitrogen intrinsic high purity of the HfC coating, thereby obtaining excellent high-temperature molten salt corrosion resistance; the h-BN island design with extremely low coverage rate ensures mechanical enhancement while maximizing the maintenance of the low interface contact resistance of the coating system. The method has a wide process window and excellent performance, and can significantly prolong the service life of the tungsten cathode under extreme working conditions.

A thermal spray material feedstock is provided for “flash-carbide” coatings. Flash carbide coatings are thin, dense, and smooth thermal spray coatings that self-activate the substrate. Flash-carbide coatings form and peen the coating to impart compressive stress for good adhesion and corrosion resistance. To achieve this combination of properties and performance, a powder that includes fine, dense, and angular particles is used; however, this powder alone results in a poor deposition efficiency of typically less than 20%. The present disclosure mitigates the poor deposition efficiency of this powder alone by providing a composition having two or more different particles at a specific ratio to improve deposition efficiency with sufficient optimized stress and corrosion properties and, in some cases, an increase in coating performance.