38 results about "Nicr alloy" patented technology

The invention provides a method for optimizing a NiCr alloy resistance temperature coefficient, which comprises the following steps of: producing by adopting a thin film process, selecting an insulating substrate with a certain thickness, firstly entering a metallization process, preparing a series of NiCr alloy thin film samples by adding a certain amount of doping gas and changing the content of argon in the NiCr metallization process, and then carrying out photoetching on the NiCr alloy thin film samples in a photoetching process to obtain the NiCr alloy resistance temperature coefficient. The method comprises the following steps: photoetching an electrode pattern by using a photoetching plate, carrying out secondary photoetching after an etching process to obtain a resistor pattern, carrying out thermal annealing on an insulating substrate engraved with the pattern under a vacuum condition at a certain temperature for a period of time, and after thermal annealing treatment, placing a test article in a hot plate to carry out resistance test at different temperatures. And finally, the metal film resistors prepared under different argon contents are used at different temperatures, TCR is calculated and compared to obtain the optimized NiCr alloy film resistor, the NiCr film is deposited on the insulating substrate by adjusting the argon content, and the resistance temperature coefficient of the NiCr film can be further optimized on the existing performance.

A heated skate blade system is disclosed for optimizing ice skating performance through app-controlled temperature adjustment. The system includes a nichrome heating coil embedded in or adjacent to the blade, powered by a thin-film lithium-ion battery integrated into the blade holder. A microcontroller governs power delivery to the coil and wirelessly communicates with a mobile application via Bluetooth. The application enables users to input variables such as ice temperature, skater weight, skate size, blade hollow (ROH), and desired blade temperature. Based on these inputs, the system adjusts heating output to reduce the coefficient of kinetic friction between the blade and ice, enhancing glide and top speed. A USB-C port enables battery charging. The invention provides real-time, user-specific thermal tuning for hockey and speed skating applications, delivering improved speed and energy efficiency through compact, embedded electronics and an intuitive mobile interface.

The invention discloses a supersonic speed electric arc spraying wear-resistant and corrosion-resistant coating material and a preparation method, the supersonic speed electric arc spraying wear-resistant and corrosion-resistant coating material is composed of the following components of, by mass, 60-75 parts of NiCr alloy, 15-25 parts of WC-Co, 5-10 parts of Al2O3-TiO2 composite ceramic powder and 1-3 parts of rare earth oxide Y2O3, a coating is of a gradient composite structure, and the NiCr alloy and the WC-Co are distributed in a gradient mode according to the spraying layer number. The preparation method comprises the steps that the surface of the base body is subjected to sand blasting roughening treatment; a supersonic speed electric arc spraying device is adopted for spraying, the electric arc current is controlled to range from 130 A to 210 A, and the spraying distance ranges from 80 mm to 150 mm; and coating hole sealing treatment. Through a composite metal-ceramic material system and a rare earth element grain refinement effect and in combination with a supersonic spraying process, the compactness (porosity is smaller than or equal to 1.5%) of the coating is remarkably improved, the bonding strength of the coating is larger than or equal to 50 MPa, the HV hardness is larger than or equal to 800, the service life in a high-temperature corrosion environment is prolonged by three times or above, and the coating is suitable for surface protection under severe working conditions such as a boiler water cooling wall.

The invention belongs to the technical field of additive preparation, and particularly relates to an inner hole laser cladding composite powder material and a preparation method thereof. The invention provides an inner hole laser cladding composite powder material and a preparation method thereof in order to solve the problems that in the prior art, an inner hole laser cladding composite powder material is poor in uniformity and flowability and has limitation in the aspects of hardness, abrasion resistance and corrosion resistance. The material comprises tungsten carbide powder, NiCr alloy powder, silver and calcium fluoride-barium fluoride mixed crystals, mixed ball milling is conducted, ball milling is conducted again after presintering, then gas atomization treatment and laser pretreatment are conducted, and finally a nickel coating is formed on the surface of the powder through a chemical coating. The composite powder material has high hardness, high wear resistance, good corrosion resistance and high-temperature stability and is suitable for inner hole laser cladding, the service life of a workpiece is remarkably prolonged, and the performance of the workpiece is remarkably improved.

The invention relates to a laser welding method. According to the welding method, a first welding wire and a second welding wire are used for conducting laser welding at the same time, the first welding wire is a gas shielded welding wire, and the second welding wire is a gas shielded welding wire or a NiCr alloy welding wire. According to the welding method for laser double-wire welding, under the action of high-energy-density laser, molten metal is rapidly melted into a gap to form a welding seam molten pool, meanwhile, molten metal in a welding seam can be rapidly cooled and solidified, thermal deformation is small, the welding seam is uniform and compact, the surface quality is good, and the risk of cracking caused by stress concentration can be reduced.

The present invention relates to the technical field of flexible thin film resistance strain gauge preparation, and discloses a method for preparing a high-temperature resistant, low-power consumption flexible thin film resistance strain gauge, comprising: (1) using a glass fiber mesh reinforced polyimide film as a substrate, coating a photoresist on the substrate surface for photolithography, and patterning a strain gauge pattern; (2) depositing a NiCr alloy film as a sensitive grid layer on the strain gauge pattern of the substrate; (3) providing an anti-oxidation film layer on the sensitive grid; and (4) removing excess photoresist from the surface, annealing, and obtaining a flexible thin film resistance strain gauge. The obtained thin film strain gauge can operate normally in a high temperature environment of 200 to 400°C, has good reliability, and has an internal resistance value of up to 3000Ω, which greatly reduces power consumption. The resistance temperature coefficient of the resistance strain gauge is low. At the same time, the use of photolithography and magnetron sputtering processes improves the processing accuracy and processing quality of the strain gauge, making it suitable for mass production.

The application discloses an air absorption film and a preparation method thereof, relates to the field of film coating, and aims to solve the problem of avoiding the decrease of vacuum degree of a VC cavity, and the technical scheme is as follows: a substrate is subjected to first layer film deposition, the target material is a NiV alloy target with a purity of 99.95%, or a NiCr alloy target with a purity of 99.9%, or an AgNi alloy target with a purity of 99.99%; then, second layer film deposition is carried out, the target material is a Pd target with a purity of 99.95%; then, third layer film deposition is carried out, the target material is a TiZr alloy target with a purity of 99.9%; then, fourth layer film deposition is carried out, the target material is a Pd target with a purity of 99.95%; then, fifth layer film deposition is carried out, the target material is a TiZr alloy target with a purity of 99.9%; then, sixth layer film deposition is carried out, the target material is a Pd target with a purity of 99.95%; and then, seventh layer film deposition is carried out, the target material is a NiV alloy target with a purity of 99.95%, or a NiCr alloy target with a purity of 99.9%, or an AgNi alloy target with a purity of 99.99%. The air absorption film and the preparation method thereof can guarantee the performance of the VC cavity.

An article including a multilayer stack and an adhesive layer is provided. The multilayer stack includes a substrate layer, a first layer, a second layer, a third layer and a fourth layer. The first layer is disposed adjacent to the substrate layer. The first layer includes nichrome. The second layer is disposed adjacent to the first layer opposite to the substrate layer. The second layer includes aluminum. The third layer is disposed adjacent to the second layer opposite to the first layer. The third layer includes a first metal oxide. The fourth layer is disposed adjacent to the third layer opposite to the second layer. The fourth layer includes a second metal oxide different from the first metal oxide. The adhesive layer is disposed adjacent to the fourth layer opposite to the third layer. The adhesive layer includes an adhesive for attaching the multilayer stack to a glass surface.

The invention discloses a nano ceramic reinforced metal-based coating and a preparation method and application thereof, and belongs to the technical field of electromagnetic rail gun guide rail materials, a first NiCr alloy is used as a base coat, a second NiCr alloy with the first TiN ceramic phase content gradually increased is used as a transition layer, and a third NiCr alloy with the second TiN ceramic phase uniformly distributed is used as a protective layer. And the nano-ceramic reinforced metal-based coating is obtained through magnetron sputtering. The second NiCr alloy with the first TiN ceramic phase content gradually increased is deposited on the surface of the base layer to serve as the transition layer, continuous transition of the thermal expansion coefficient, the elastic modulus and the hardness between the coating and the substrate is achieved, and the coating has high bonding strength. The NiCr alloy is low in hardness and wear resistance, and a high-hardness TiN nitride nano ceramic phase is introduced into the NiCr alloy, so that multiple characteristics of electric conduction, heat conduction, wear resistance and arc ablation resistance of the coating material are realized, and the service life of the guide rail is prolonged.

The application relates to the technical field of NiCr alloy surface modification, in particular to a Ni20Cr alloy and a preparation method and application thereof. The method comprises the following steps: annealing treatment is performed on a Ni20Cr alloy base material to obtain annealed Ni20Cr alloy, then surface pretreatment is performed to obtain recrystallized Ni20Cr alloy; subsequently, deep cold ultrasonic shot blasting treatment is performed on the recrystallized Ni20Cr alloy to obtain the Ni20Cr alloy. By constructing a gradient nanotwin structure on the surface of the Ni20Cr alloy, the mechanical properties and high-temperature oxidation resistance are synergistically improved. The gradient nanotwin structure not only endows the Ni20Cr alloy with excellent strength-plasticity matching, but also exhibits significant oxidation resistance in a high-temperature service environment, and the problems existing in the prior art are overcome.

A wear-resistant lining plate, comprising a wear-resistant lining plate body (1). The wear-resistant lining plate body (1) consists of a 42CrMo base material (2) and a thermally sprayed NiCr alloy coating (3), wherein the thermally sprayed NiCr alloy coating (3) is sprayed on the surface of the wear-resistant lining plate body (1) in contact with waste edge materials and the outer circle of the wear-resistant lining plate body. The preparation process for the wear-resistant lining plate comprises the following steps: feeding, workpiece forging, rough machining, tempering, surface pre-machining, workpiece surface purification, drying, surface roughening, fitting between workpiece and tooling, spraying a NiCr powder alloy, heat treatment, treatment after spraying, and mounting a waste edge coiler for normal operation.

The utility model discloses a high-temperature-resistant knuckle bushing, which relates to the field of knuckle bushings and comprises a bushing shell, a high-temperature-resistant layer is fixedly connected to the outer wall of the bushing shell, a corrosion-resistant layer is fixedly connected to the outer wall of the high-temperature-resistant layer, and the high-temperature-resistant layer is fixedly connected to the outer wall of the bushing shell. The high-temperature-resistant layer is fixedly connected to the outer wall of the steering knuckle bushing, the high-temperature-resistant layer is made of low-carbon steel, the high-temperature-resistant performance of the steering knuckle bushing can be improved, and therefore the service life of the steering knuckle bushing is prolonged, the corrosion-resistant layer is fixedly connected to the outer wall of the high-temperature-resistant layer, the corrosion-resistant layer is made of metal titanium, and the corrosion-resistant performance of the steering knuckle bushing can be improved; according to the steering knuckle lining, the corrosion-resistant layer is fixedly connected to the outer wall of the lining shell, the steering knuckle lining is prevented from being corroded due to soaking of lubricating oil, the outer wear-resistant coating is fixedly connected to the outer wall of the corrosion-resistant layer and made of nichrome, the inner wear-resistant coating is fixedly connected to the inner wall of the lining shell and made of tungsten carbide, and the wear-resistant performance of the steering knuckle lining can be improved.

Surface Heating Element and Manufacturing Method. This invention relates to a surface heating element that generates heat using electricity and a method for manufacturing the same. One embodiment of the invention provides a surface heating element comprising a NiCr alloy, having an adhesion strength of 3N or more relative to a substrate or insulating layer, and a resistivity of 10⁻⁶. ‑4 Ωcm to 10 ‑2 With a strength of Ωcm, this surface-type heating element can be used even at high operating temperatures above 400°C. It suppresses material release, has high fracture toughness, low coefficient of thermal expansion, and heat resistance, thereby improving product reliability and lifespan.

The present disclosure relates to a stainless steel product comprising a stainless steel sheet. On a surface of the stainless steel sheet an adhesion promoter is applied. The adhesion promoter comprises a CoCr and / or NiCr alloy, wherein and on the adhesion promoter an enamel coating is applied. The present disclosure also relates to a magnetic-inductive flow meter, to a field device and to a method for producing a stainless steel product.

The invention provides a three-terminal fuse and a preparation method thereof. The fuse comprises BT resin or a PCB substrate and is provided with a through hole. The NiCr alloy conductive circuit is formed through a lift-off photoetching process and emits heat in case of overcurrent; the side electrode is connected with the conductive circuit by adopting a through hole printing process; the silica gel insulating layer prevents short circuit and has conductivity and fusing performance, and the protective layer provides environmental stability. The preparation method comprises the following steps: drilling to form a through hole, printing a side electrode, cleaning and lightly etching a substrate, forming a conductive circuit by adopting a lift-off process, printing an insulating layer, electroplating a melt layer, removing a photoetching film, forming a protective layer and completing packaging. The fuse is simple in structure, accurate in fusing, low in manufacturing cost, suitable for surface mounting, widely applied to the field of consumer electronics and capable of providing reliable overcurrent protection.

The invention discloses a high-temperature oxidation-resistant babbitt metal wire as well as a preparation method and application of the high-temperature oxidation-resistant babbitt metal wire. Belongs to the technical field of alloy wires. According to the wire, a NiCr alloy coating with the thickness of 1-2 microns is arranged on the surface of a babbitt metal matrix. The plating layer melts along with the babbitt metal under the action of high temperature, the Cr element is used for stabilizing droplet transition so as to reduce shielding gas involved in air in the disturbance process, oxidation films of Ni and Cr elements are used for preventing oxygen diffusion, the droplet evaporation and metal steam oxidation process is remarkably inhibited, and therefore oxide generation in the high-energy machining process is greatly reduced. Experiments show that the oxide is reduced by more than 80% under the arc fuse wire additive process; under the laser fuse wire additive process, the oxide is reduced by more than 30%; and under the plasma fuse spraying process, the oxide is reduced by more than 20%. According to the wire, the process stability and the cladding layer quality can be effectively improved, and the bonding strength of the prepared cladding layer and the base material is also improved to a certain extent.

The invention relates to Ag-NiCr alloy high-transmittance temperable low-emissivity coated glass, and belongs to the field of coated glass. A film layer of the coated glass sequentially comprises a first silicon nitride dielectric layer, a second seed protection layer, a third nickel-chromium absorption layer, a fourth Ag-NiCr alloy functional layer, a fifth nickel-chromium absorption layer, a sixth seed protection layer and a seventh silicon nitride dielectric layer from a glass substrate to the outside. According to the coated glass, a nickel-chromium material is added into a silver layer for segmentation, and atoms in the silver layer and a nickel-chromium segmentation layer are mutually permeated and diffused through heat treatment under specific conditions and are fully fused to form an Ag-NiCr alloy material layer of which the grain diameter is remarkably reduced; therefore, the hardness, the wear resistance, the corrosion resistance and the high-temperature resistance of the functional layer are improved, and the processing resistance of the film layer is remarkably improved; the coated glass has the advantages of simple structure, high visible light transmittance, low indoor reflectivity and small color difference before and after tempering, and is suitable for large-scale popularization and application.

The invention provides a microwave digestion method and application of Ni-based alloy. The microwave digestion method comprises the following steps: (1) mixing Ni-based alloy, concentrated hydrochloric acid and concentrated nitric acid to obtain a mixture; wherein the Ni base alloy comprises a NiPt alloy or a NiCr alloy; (2) sequentially carrying out first-stage microwave digestion, second-stage microwave digestion and third-stage microwave digestion on the mixture to obtain a digested solution; wherein the temperature of the first-stage microwave digestion is more than the temperature of the second-stage microwave digestion and is less than the temperature of the third-stage microwave digestion; the heat preservation time of the first-stage microwave digestion is more than the heat preservation time of the second-stage microwave digestion and less than the heat preservation time of the third-stage microwave digestion. The Ni-based alloy can be completely dissolved by adopting a mixture of concentrated hydrochloric acid and concentrated nitric acid, and meanwhile, the dissolution rate can be obviously increased through a specific microwave digestion mode, so that rapid dissolution is realized.

The utility model relates to the technical field of nichrome cutting, in particular to an automatic nichrome electric heating wire cutting machine which comprises a device body, an input roller is installed on one side of the device body, a limiting disc is connected to the outer side of the input roller, a limiting rod is arranged on the upper side of the input roller, and a pressing disc is installed on the limiting rod. A supporting frame is installed on the device body, a lifting frame is movably connected to one side of the supporting frame, a collecting frame is arranged on the bottom side of the lifting frame, cooling boxes are installed on the two sides of the collecting frame, and an output roller is arranged on the other side of the device body. According to the scheme, the possibility that materials deviate in the conveying process is reduced, the possibility that the temperature of a heating wire is continuously transmitted to the device body to affect object conveying is reduced, the waste residue collecting effect of the device in the cutting process is improved, waste residues are prevented from being adhered to a high-temperature area, the contact type cutting effect of the device is also improved, and the cutting efficiency is improved. And the possibility of mistaken touch and failure is avoided.

The utility model discloses a film resistor with a laser cutting knife type, which comprises a ceramic substrate, an inner electrode layer arranged at the edge of the ceramic substrate, a laser cutting resistor layer lapped at the end part of the inner electrode layer, an outer electrode layer arranged on the outer surface of the inner electrode layer, a protective layer arranged on the outer surface of the laser cutting resistor layer, and a plurality of knife types arranged on the laser cutting resistor layer. Compared with a thick-film resistor, the thin-film resistor has the advantages that the NiCr alloy is used as the inner electrode to replace a silver layer, the material cost is reduced, the NiCr alloy is used as the resistance layer to replace paste printing ruthenium / silver oxide, the material cost is reduced, multi-cutter laser cutting is used, the resistance precision is improved, a G1 protective layer is not used, lead-free and environment-friendly effects are achieved.

This invention discloses a method for preparing NiCr alloy sputtering targets, belonging to the field of powder metallurgy technology. The preparation method is as follows: S1, by weight percentage, Ni powder is 38-42 wt% and Cr powder is 58-62 wt%; S2, zirconium balls are added to the raw material at a weight ratio of 1:6 in a mixing tank, argon gas is introduced, and the mixture is then mixed in a ball mill; S3, after the NiCr alloy powder is loaded into a mold, it is pre-pressed in a furnace to 5-8 MPa, held for 5-10 minutes, and then depressurized; a vacuum is drawn to below 10 Pa, and the temperature is raised to 1150-1200℃ in three stages, then held at that temperature and pressurized at a uniform rate to 30-40 MPa. After sintering, a NiCr alloy target blank is obtained, which is then machined to obtain a NiCr alloy target of suitable size. The NiCr alloy target prepared by this invention has low oxygen content, high relative density, and uniform grain size, effectively ensuring the quality of the sputtered film.

The invention relates to the technical field of electrode preparation of a hydrogen production process, in particular to an anti-reverse polarization electrode and a preparation method and application thereof. According to the preparation method, a NiCr alloy transition layer is prepared on one surface of a substrate through a thermal spraying process, so that the bonding strength of the substrate and a catalyst layer is improved; a NiMoAl alloy doped with Cr and other specific metals is loaded on the surface of the transition layer to serve as a catalyst layer; and meanwhile, the other surface of the substrate is coated with a metal or alloy material with a certain thickness to form a charge storage layer. The preparation method is compatible with existing industrial equipment, and large-scale production and application are easy. In the composite structure of the anti-reverse polarization electrode provided by the invention, the transition layer not only can enhance the binding force of the catalyst and the substrate, but also can effectively inhibit the thermal deformation problem of the nickel substrate caused by the high-melting-point alloy in the spraying and cladding process.

The application discloses a kind of high red hardness diamond laser sawing piece production methods, belong to diamond tool technical field.The diamond laser sawing piece base body uses heat-treated 30CrMo alloy steel, its hardness is between HRC35-39;Diamond and NiCr alloy powder are mixed and then placed into vacuum furnace, at 820-850 DEG C, 100-150 minutes are kept to obtain plated diamond;The tool bit binder uses Fe-Cu-CO-W alloy material, and the diamond content in diamond tool bit is 10-20wt.%.The sawing piece is made of high-strength alloy steel base body and high-performance metal binder, high-strength diamond after plating treatment, using advanced laser welding process, ensures that the tire body holds force and high-temperature red hardness when machining.Diamond is ensured to be firmly combined with the tire body by vacuum plating process, and is prevented from falling off during cutting.

The invention relates to the technical field of alloy coating materials, and particularly discloses an anti-oxidation coating for a high-pressure hot-pressing mold and a preparation method of the anti-oxidation coating. The high-pressure hot-pressing mold anti-oxidation coating comprises a transition layer and a functional layer which are sequentially arranged from a mold base body to the outside, the transition layer is a TiN-SiC gradient composite layer, the functional layer takes Al2O3-NiCrAlY as a base body, and nano ZrB2 and rare earth CeO2 which are subjected to double modification treatment are compositely doped; and the dual-modified nano ZrB2 is ZrB2 particles which are coated with a silane coupling agent KH-560 and a NiCr alloy. The anti-oxidation coating of the high-pressure hot-pressing mold has both oxidation resistance and wear resistance, and the high-temperature hardness stability and wear resistance of the anti-oxidation coating are effectively enhanced.

The application belongs to the technical field of additive manufacturing, and particularly relates to an inner hole laser cladding composite powder material and a preparation method thereof. In order to solve the problems of poor uniformity and flowability of the inner hole laser cladding composite powder material in the prior art and the limitations in hardness, wear resistance and corrosion resistance, the application provides an inner hole laser cladding composite powder material and a preparation method thereof. The material comprises tungsten carbide powder, NiCr alloy powder, silver and a mixed crystal of calcium fluoride and barium fluoride, is mixed and ball milled, is pre-sintered and then ball milled again, is then subjected to gas atomization treatment and laser pretreatment, and finally a nickel plating layer is formed on the surface of the powder through chemical plating. The composite powder material has high hardness, high wear resistance, good corrosion resistance and high temperature stability, is suitable for inner hole laser cladding, and significantly improves the service life and performance of a workpiece.

The application discloses a nickel-chromium coated tin bronze self-lubricating composite coating and a preparation method thereof. Tin bronze powder is placed in a chemical plating chromium solution, and is kept at 70-90 DEG C for 110-130 min to obtain a chemical plating composite powder. The nickel-chromium coated tin bronze self-lubricating composite coating is sprayed on the surface of an alloy base by using a wide-speed-range high-energy plasma spraying method. The self-lubricating composite coating prepared by the application has a NiCr alloy phase dispersedly distributed in the structure, and a Cr-rich phase is dispersed in the coating in the form of a small unit with a diameter of 1 micrometer, which serves as a dispersion strengthening phase, promotes the increase of the slip resistance of plastic deformation of the coating, and improves the mechanical strength of the coating. The introduced Ni and Cr react with the tin bronze during the spraying process to generate a new alloy phase, changes the regular layered arrangement of metal atoms, makes the relative sliding between the atom layers difficult, and is beneficial to improving the mechanical strength and fracture toughness of the coating.

The utility model provides a shell of a shell and tube heat exchanger with a nichrome medium tube set. The shell comprises a first shell plate, a second shell plate, a third shell plate and a fourth shell plate. The first shell plate, the second shell plate, the third shell plate and the fourth shell plate are enclosed and are connected through solder to form a shell; the cross sections of the first shell plate, the second shell plate, the third shell plate and the fourth shell plate are arranged in an arch shape. According to the utility model, the plurality of groups of shell plates made of metal materials are assembled to form the shell, so that the shell has higher loading capacity. The first end face and the third end face of the shell plate respectively extend towards the second end face, intersect with the second end face and are integrally arranged, so that the cross section of the shell plate made of metal materials is in an arch shape, and then the local geometric curvature is enhanced; at the moment, the shell plate with the arched cross section is beneficial to uniformly distributing pressure to different parts of the shell plate, so that stress concentration is reduced, and local deformation is prevented.

The utility model provides a flow collecting cover of a shell and tube heat exchanger provided with a nichrome medium tube set. The flow collecting cover comprises at least one set of first flow collecting cover, second flow collecting cover and third flow collecting cover and a tube plate. The first flow collecting cover, the second flow collecting cover and the third flow collecting cover are each provided with a flow collecting cover shell, and a groove body is formed in the tube plate. The flow collecting cover shell extends into the tank body, and a brazing filler metal filling layer is arranged between the outer wall, extending into the tank body, of the flow collecting cover shell and the tank body. The groove body is formed in the tube plate, and the brazing filler metal filling layer is matched with the tube plate and the flow collecting cover, so that connection between the flow collecting cover and the tube plate is achieved; therefore, the second flow collecting cover is additionally arranged, a U-shaped connector of a traditional range extending pipeline is replaced by the additionally arranged second flow collecting cover, installation is easy, when integrated welding is carried out in a brazing furnace, all welding spots are concentrated on the pipe plate, the number of the welding spots is reduced, and then the probability of leakage points is greatly reduced.

The present application belongs to the technical field of rail surface protection, and particularly relates to a coating particle for a steel rail surface, a preparation method and a spraying method. The coating particle is composed of NiCr alloy particles and TiB2 ceramic particles; the mass percentage of the NiCr alloy particles is 41% to 60%, and the mass percentage range of the TiB2 ceramic particles is 40% to 59%. In the coating particle, a composite powder of NiCr alloy and TiB2 ceramic is selected as raw material. The NiCr alloy has good shape stability, electrical conductivity and thermal conductivity, excellent wear resistance, corrosion resistance and other characteristics. The TiB2 ceramic has high hardness, high strength, high wear resistance and high modulus characteristics, and can make up for the low hardness and poor wear resistance of the NiCr alloy. The TiB2 ceramic is a conductive ceramic. When it is combined with the NiCr alloy, the advantages of the good plasticity and corrosion resistance of the NiCr alloy and the high hardness and high wear resistance of the TiB2 ceramic can be taken into account, and the conductive ability is also possessed. When the coating particle is used as a coating for the steel rail surface, good technical effects can be achieved.

The application relates to the technical field of alloy coating materials, and particularly discloses a high-pressure hot-pressing die oxidation-resistant coating and a preparation method thereof. The high-pressure hot-pressing die oxidation-resistant coating comprises a transition layer and a functional layer arranged outward from a die base body, the transition layer is a TiN-SiC gradient composite layer, the functional layer takes Al2O3-NiCrAlY as a base body, and is compounded and doped with double-modified nano ZrB2 and rare earth CeO2; the double-modified nano ZrB2 is ZrB2 particles coated with a silane coupling agent KH-560 and a NiCr alloy. The high-pressure hot-pressing die oxidation-resistant coating has oxidation resistance and wear resistance, and effectively enhances the high-temperature hardness stability and wear resistance of the oxidation-resistant coating.