44 results about "Carbide coating" patented technology

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.

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 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 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.

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.

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 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 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 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.

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 utility model relates to the technical field of worms, in particular to an anti-impact worm which comprises a main shaft body, a buffer layer, a damping assembly and a supporting ring. Arc-shaped reinforcing ribs are arranged on the outer surface of the main shaft body, the buffer layer is composed of a high-elasticity rubber layer and a hard alloy coating, the damping assembly comprises an end cover, a spring ring and a damping fin, and the supporting ring is provided with a flow guide groove and balls. By optimizing the structural design and material selection, the tooth crest strength is enhanced, the impact force in the punching process is dispersed, the dynamic load is absorbed, abrasion and friction loss are reduced, and the operation stability and durability are improved. The worm solves the problems that in the prior art, under the high-load and impact working conditions, fatigue fracture is prone to occurring, tooth surfaces are abraded, and the impact resistance is insufficient, and the high-performance transmission requirement is met.

The invention provides a carbon-based coating bipolar plate as well as a preparation method and application thereof. The carbon-based coating bipolar plate comprises a metal base material, a metal carbide coating and a carbon-based composite coating which are sequentially stacked, the carbon-based composite coating comprises multiple layers of SP2 hybrid carbon coatings and SP3 hybrid carbon coatings which are alternately stacked, the weight percentage of SP2 hybrid carbon atoms in the SP2 hybrid carbon coatings is 60-75%, and the weight percentage of SP3 hybrid carbon atoms in the SP3 hybrid carbon coatings is 70-85%. Metal carbide is arranged as the middle layer, amorphous carbon of different hybridization types is arranged as the surface layer, the cost of the bipolar plate can be reduced, the binding force between the metal substrate and the carbon-based composite coating is enhanced, SP2 hybridization carbon has good conductivity, SP3 hybridization carbon has excellent corrosion resistance, the reasonable SP2 hybridization carbon and SP3 hybridization carbon content is set, and the service life of the bipolar plate is prolonged. The bipolar plate has good conductivity and corrosion resistance, and the service life of the bipolar plate is remarkably prolonged.

The invention relates to the field of PVD coating matrix pretreatment, in particular to a hard alloy PVD coating matrix pretreatment device. The hard alloy PVD coating matrix pretreatment device comprises a shell, and a treatment groove is formed in the upper end of the shell; the inserting mechanism comprises a lifting plate, a plurality of inserting assemblies are arranged below the lifting plate, each inserting assembly comprises a supporting disc, the upper end of the supporting disc is fixedly connected with the lifting plate through two fixing plates, a plurality of rotating pipes are arranged on the supporting disc in a penetrating mode, and the rotating pipes are rotationally connected with the supporting disc through bearings; and the lower ends of the plurality of rotating pipes are fixedly connected with rotating cylinders. The treatment device is used for pretreatment before nickel-platinum alloy target coating of the cutter and mainly used for ultrasonic acid pickling operation after polishing, during use, residual metal powder on the surface of the cutter can be basically removed before the cutter enters acid liquor, in addition, in the acid pickling process, the acid pickling efficiency can be improved, meanwhile, the service life of the cutter is prolonged, and the service life of the cutter is prolonged. And the influence of possible residual metal powder on acid pickling is effectively avoided.

This invention relates to the field of composite material technology, specifically to a one-step method for preparing a metal carbide coating on the surface of diamond powder using dual-target magnetron sputtering technology. The method includes: pretreating diamond particles to remove surface impurities; loading the pretreated diamond particles into a vacuum rolling deposition apparatus, using a metal target and a graphite target as targets, and directly depositing a metal carbide coating on the surface of the diamond particles via dual-target magnetron sputtering in an argon atmosphere. This method eliminates the need for subsequent high-temperature heat treatment, performing the process near room temperature, thus avoiding thermal damage to the diamond and oxidation of the metal coating. The process is significantly simplified, highly efficient, and easy to implement. By controlling the sputtering parameters, a dense, uniform, high-purity, and controllable thickness metal carbide coating can be obtained on the surface of the diamond particles, effectively optimizing the interface between the diamond and the metal matrix, and laying the foundation for the preparation of high-performance diamond / metal composite materials.

The invention relates to the technical field of rotor engines, in particular to a high-wear-resistance and self-lubricating radial sealing fin material. According to the method, the Cr12MoV alloy tool steel is used for preparing the metal carbide coating through a diffusion method for the first time, and the radial sealing piece suitable for the high-power rotor engine is prepared in cooperation with follow-up treatment. The wear resistance of the sealing piece is improved, the service life of the sealing piece is prolonged, and the technology for achieving noise reduction through material optimization and structure optimization of the sealing piece is provided for the first time. The process is simple and controllable, the obtained product is excellent in performance, and industrial application is facilitated.

A die for a pig casting machine comprises a forming die cavity, a protective edge is arranged at the upper end of the forming die cavity, and a dovetail groove is formed in the protective edge. Lifting lug steel cores are arranged at the two ends of the forming die cavity and connected with the protective edges in a matched mode through dovetail grooves. A coating layer is arranged on the outer side of the lifting lug steel core, the coating layer is a titanium alloy layer, and a WC-Co hard alloy coating is arranged on the surface of the titanium alloy layer; the upper side and the lower side of the lifting lug are each provided with a brazing layer, and the brazing layers are alloy brazing layers. The problem that the hanging lug is prone to cracking is solved, cost and installation and maintenance convenience are taken into account, the reliability and stability of the pig casting machine mold are improved, and smooth production is guaranteed.

The invention belongs to the technical field of hard alloy coating cutters, and particularly relates to a hard alloy coating blade for milling high-hardness materials and a preparation method of the hard alloy coating blade. The preparation method of the hard alloy coating blade for milling the high-hardness material comprises the steps of ingredient wet grinding, drying granulation, compression molding, sintering and coating deposition. According to the method, the arc ion plating technology is adopted, and the gradient composite coating design of AlTiN / AlTiSiN / TiSiN is adopted, so that the internal stress of the coating can be greatly reduced, the coating thickness of the cutting edge of the cutter can reach 4.0 microns, and the phenomena of film collapse and falling are avoided. The AlTiN coating is used as a transition layer between the substrate and the coating, so that the film-substrate binding force can be greatly improved; the AlTiSiN composite transition layer is used as a middle layer and is a main supporting layer and a processing layer; the TiSiN coating on the top layer is smooth in surface, low in friction coefficient, high in coating hardness, excellent in wear resistance and excellent in cutting performance.

The invention provides an abrasion-resistant high-performance composite coating as well as a preparation method and application thereof, and belongs to the technical field of composite coatings. The preparation method comprises the following steps: mixing WC, FCC high-entropy alloy, rare earth oxide and FeB to obtain a mixed sample; the FCC high-entropy alloy is FeCoNiCrMn, FeCoNiCrCu, or FeCoNiCrMo, and the FCC high-entropy alloy is prepared from the FCC high-entropy alloy and the FCC The rare earth oxide is CeO2 and / or Y2O3; the mixed sample is subjected to hydrogen-nitrogen reduction, and mixed alloy powder is obtained; and the mixed alloy powder is subjected to magnetic field assisted plasma cladding, and the abrasion-resistant high-performance composite coating is obtained. HEAs is adopted to replace Co to serve as a binding phase of the WC-based hard alloy coating, ReO is added to serve as a grain growth inhibitor, FeB with a low melting point is added, and a magnetic field auxiliary technology is combined, so that the prepared composite coating is excellent in abrasion resistance and suitable for abrasion resistance of the flow passage component of the water turbine.

The utility model discloses a thermochromic film-coated cover plate, which comprises a glass substrate, a thermochromic ink layer, wherein the thermochromic ink layer is arranged on one side of the glass substrate; the black silicon carbide coating layer is arranged on one side, far away from the glass substrate, of the thermochromic ink layer. The heat discoloration film-coated cover plate can reduce the risk of falling off from a product shell.

A method for forming a high temperature coating includes applying a carbon powder to a surface of a carbon / carbon (C / C) composite substrate to force the carbon powder into one or more surface voids of the surface of the C / C composite substrate. The carbon powder has substantially the same composition and morphology as surface portions of the C / C composite substrate. The method includes applying a metal slurry to the surface of the C / C composite substrate after applying the carbon powder and reacting a metal of the metal slurry with carbon of the carbon powder and carbon of the surface portions of the C / C composite substrate to form a metal-rich oxidation barrier layer of metal carbide on the C / C composite substrate.

This invention discloses a chemical vapor deposition (CVD) hafnium carbide (HfC) coating for repairing tungsten cathodes, belonging to the field of high-temperature electrochemistry and surface engineering technology. The coating comprises a tungsten carbide gradient transition layer, discretely distributed hexagonal boron nitride (HfC) nanoislands, and a hafnium carbide deposition layer. This invention uses HfC nanoislands as templates to induce the growth of HfC nanopillars, forming strong nanomechanical interlocking. Combined with the metallurgical bonding of the WC gradient layer, this imparts the coating with superior adhesion and thermal shock resistance. The use of a nitrogen-free hafnium source ensures the low-nitrogen intrinsic high purity of the HfC coating, thereby achieving excellent resistance to high-temperature molten salt corrosion. The extremely low coverage hfC island design ensures mechanical reinforcement while maximizing the maintenance of low interfacial contact resistance in the coating system. This method has a wide process window, excellent performance, and can significantly extend the service life of tungsten cathodes under extreme operating conditions.

This invention provides a design method for high-entropy ceramic carbide coatings for laser protection, belonging to the field of laser protection ceramic material design technology. The method includes: constructing a high-entropy ceramic carbide atomic model using a special quasi-random structure method; performing relaxation optimization on the structure based on DFT; generating a neural network potential energy training database based on multi-condition AIMD calculations; constructing a neural network model and training energy-force data using DeepMD-kit; performing LAMMPS simulations using DeepMD, setting upper and lower thresholds based on model deviations to filter high-deviation configurations; performing high-precision calculations on the high-deviation configurations to generate a high-entropy carbide potential function with acceptable accuracy; and optimizing the coating composition ratio to obtain the optimal laser protection high-entropy ceramic carbide coating design scheme. This invention combines first-principles calculations and deep learning to construct a high-precision potential function suitable for laser protection scenarios, efficiently completing the precise design of high-performance laser protection coatings.

This invention discloses a bearing wear-resistant coating and a TC bearing, belonging to the technical field of cemented carbide coated bearings. It includes a wear-resistant coating and a wear-resistant transition layer. The wear-resistant coating comprises 10-40% metallic binder phase, 0.3-0.8% rare earth oxides, and the balance being a wear-resistant hard phase. The preparation method of the bearing wear-resistant coating is as follows: S1. Laser cladding the raw materials for the wear-resistant transition layer onto the surface of the bearing steel substrate; S2. Mixing, grinding, pressing, and pre-sintering the raw materials for the wear-resistant coating to obtain a blank, then pulverizing and ball-milling the blank to obtain coating powder; S3. Laser cladding the coating powder onto the surfaces of the cemented carbide block and the wear-resistant transition layer to form the bearing wear-resistant coating. This invention significantly improves the bonding stability between the coating and the bearing substrate and cemented carbide block, reduces damage to the heat-affected zone of the substrate, and the prepared TC bearing has long-term service capability.

Provided is a refractory member that is excellent in corrosion resistance and excellent in the adhesiveness of a carbide coating disposed on a surface of a graphite material base. The refractory member includes: a graphite material base; and a carbide layer disposed to coat at least a part of a surface of the graphite material base. In the refractory member, the graphite material base includes a graphite material phase and a pore, the carbide layer includes a composite region, and the composite region includes an alternating region in which a continuous graphite material phase of at least 50 μm or more and a continuous carbide phase of at least 50 μm or more alternately exist in a horizontal direction along an interface between the graphite material base and the carbide layer, as viewed in a cross section along the thickness direction of the carbide layer.

The invention discloses a high-temperature-resistant and wear-resistant amorphous multi-element carbide coating and a preparation method thereof, and belongs to the technical field of high-temperature protective coating materials. The coating comprises a CrY / CrYTiAl composite transition layer and a (TiCrNbAlYSi) C functional layer, wherein the CrY / CrYTiAl composite transition layer and the (TiCrNbAlYSi) C functional layer are sequentially deposited on a base material. And the functional layer is of an amorphous structure and comprises the following elements in atomic percent: 45%-65% of C, 3%-10% of Ti, 3%-10% of Cr, 3%-10% of Nb, 3%-10% of Al, 3%-10% of Y and 3%-10% of Si. According to the preparation method, the arc ion composite magnetron sputtering co-deposition technology is adopted, the composite transition layer and the amorphous functional layer are sequentially deposited, and a Si magnetron target and multiple cathode arc targets are specially introduced for co-deposition, so that the preparation problem of the high-silicon-content amorphous functional layer is effectively solved. The coating provided by the invention has excellent high-temperature oxidation resistance, wide temperature range, low wear rate and high bonding strength with a base material, and is suitable for surface protection of high-temperature parts in the fields of aerospace, nuclear energy and the like.

This invention relates to the field of thermal spraying technology and discloses a preparation process for a conductive and corrosion-resistant cemented carbide coating, addressing the problem of conductive failure in existing cemented carbide coatings under corrosive environments due to preferential corrosion of the binder phase or oxide formation. This invention proposes a composite coating system based on a nickel-chromium-molybdenum ternary alloy binder phase, carbon nanotubes, and lanthanum oxide dual-effect modification, along with an optimized entire process. Ternary alloying achieves complementary enhancement of mechanical properties and corrosion resistance; carbon nanotubes construct a low-resistivity conductive network; and the interface purification effect of rare earth oxides improves coating density. The prepared coating exhibits excellent bonding strength, extremely low volume resistivity, and outstanding long-term corrosion resistance, effectively providing dual protection of physical shielding and functional conductivity under harsh operating conditions.

The invention relates to the field of ceramic filter preparation, in particular to a recrystallized silicon carbide honeycomb ceramic filter and a preparation method thereof. The preparation method comprises the following steps: carrying out ball milling on 8-15 parts by mass of nano silicon carbide whiskers, 65-85 parts by mass of fine silicon carbide powder, 1-5 parts by mass of boron-doped graphene, 2-5 parts by mass of starch microspheres and 1-3 parts by mass of sodium bicarbonate for 20-30 hours; after ball milling, the mixture is subjected to vacuum impregnation in a polycarbosilane solution to be uniformly dispersed; after removing bubbles through vacuum pugging, extruding to prepare a honeycomb biscuit; drying for 1-2 hours in stages at the temperature of 60-120 DEG C, and then heating to 550-650 DEG C; the pressure of 40-60 MPa is applied to a graphite mold, the temperature is increased to 1600-1800 DEG C under the protection of argon, and heat preservation is conducted for 1.5-2.5 h; raising the temperature to 2000-2200 DEG C, and keeping the temperature for 2-3 hours; and coating a nano silicon carbide coating on the surface of the pore channel by plasma spraying. According to the recrystallized silicon carbide honeycomb ceramic filter, the trapping efficiency of particles with the particle size larger than or equal to 2.5 micrometers reaches 99% or above, the compressive strength is larger than 350 MPa, the thermal shock resistance frequency is 50 or above, and the mechanical property and the high temperature resistance are good.