97 results about "Niobium carbide" patented technology

The invention discloses a multi-layer plating process for optimizing surface characteristics of a base material, which is characterized by comprising the following steps of: pretreating the surface of a plated base material, improving the surface smoothness of the base material, and removing dirt on the surface of the base material; electroplating the base material by using the nickel pre-plating solution; chemical plating: the base material subjected to pre-plating treatment is placed in a chemical composite plating solution for chemical plating; the chemical composite plating solution comprises a basic plating solution and second-phase particles, the second-phase particles are nano niobium carbide, and the second-phase particles are wrapped and embedded into an alloy plating layer in the chemical plating process, so that the second-phase particles are distributed in plating layer matrix metal in a discrete mode to form a discontinuous phase. The hard particles niobium carbide are added and are dispersed and distributed in a coating substrate (Ni-P alloy), the hard particles can effectively refine the substrate metal, so that the hardness of the substrate metal is improved, and the niobium carbide hard phase particles are high in hardness, excellent in wear resistance, large in yield limit and high in pressure resistance.

The invention relates to a stainless steel flux-cored wire and a preparation method thereof, and relates to the technical field of flux-cored wires. The stainless steel flux-cored wire comprises a stainless steel strip and a double-layer flux core, the stainless steel strip is filled with the double-layer flux core, and the filling amount of the double-layer flux core accounts for 20-25% of the total mass of the stainless steel flux-cored wire; the double-layer flux core comprises a rapid reaction layer and an alloy transition layer, the rapid reaction layer comprises an oil stain oxidizing agent, the oil stain oxidizing agent comprises a high-temperature decomposition type organic matter and an inorganic composition, and the inorganic composition comprises copper oxide and ferric oxide with the mass ratio being (1-1.5): 1. The high-temperature decomposition type organic matter comprises polytetrafluoroethylene micro powder and trisodium citrate according to the mass ratio of 1: (3-5), and the alloy transition layer comprises 316L stainless steel powder, metal powder, silicon powder, niobium carbide and rare earth oxide. The invention can effectively avoid hydrogen embrittlement caused by diffusible hydrogen easily formed by compounds in anti-rust oil remaining on the surface of the welding wire during welding and entering a welding seam.

The invention relates to the field of coatings, and discloses a wear-resistant and corrosion-resistant high-entropy alloy composite coating and a preparation method thereof.The wear-resistant and corrosion-resistant high-entropy alloy composite coating is prepared by depositing functional high-entropy alloy composite powder on the surface of a base body in a laser cladding mode, the functional high-entropy alloy composite powder comprises high-entropy alloy powder, a modified additive and composite ceramic powder, the modified additive is prepared by using urea and titanium tetrachloride as raw materials, growing nano titanium nitride particles on the surface of a silicon carbide nanowire in situ to prepare a nano titanium nitride / silicon carbide nanowire composite material, and then coating a layer of nano titanium dioxide particles on the surface of the nano titanium nitride / silicon carbide nanowire composite material by using tetrabutyl titanate; and the composite ceramic powder is prepared by compounding zirconium carbide, niobium carbide, hafnium carbide and tantalum disilicide. The hardness, wear resistance and corrosion resistance of the high-entropy alloy coating are enhanced by adding the modified additive and the composite ceramic powder.

The invention discloses a preparation method of a chemical composite plating solution based on nano niobium carbide. The preparation method comprises the following steps: step 1, pretreating niobium carbide (NbC) powder; step 2, preparing a chemical plating solution, wherein every 1L of the chemical plating solution contains 30g of nickel chloride, 20g of sodium hypophosphite, 10g of sodium citrate, 5g of glycine, 10g of sodium acetate, 0.3 g of sodium dodecyl benzene sulfonate and 80mg of zinc molybdate; fixing the volume to 1L by using distilled water; 3, measuring the niobium carbide suspension liquid, mixing the niobium carbide suspension liquid with the chemical plating solution, and fixing the volume, so that the content of niobium carbide in the chemical composite plating solution is 0.01-0.3 g / L; adjusting the pH value of the solution to 5.8; according to the method, niobium carbide nanoparticles are added into the chemical composite plating solution, so that the surface of a plated part and metal gold are combined with the particles, and the hardness and wear resistance of a base material are effectively improved; the effect on a 60-80-micron nickel-phosphorus coating in the industry is achieved through the ultrathin chemical composite coating (8-10 microns), so that the corrosion resistance and the wear resistance of the product are enhanced.

The invention belongs to the field of mineral smelting, and particularly relates to a selective carbonization roasting and niobium / titanium separation method for niobium-titanium-iron paragenic ore, which comprises the following steps of: carbonizing the niobium-titanium-iron paragenic ore and a carbon material in a weight ratio of 100: (2-10) in activated gas at the temperature T, niobium in the niobium-titanium-iron paragenic ore is selectively converted into niobium carbide, a niobium-iron alloy is formed, then the carbonized product is subjected to magnetic separation treatment, and a niobium-iron alloy magnetic separation material containing niobium carbide and titanium-enriched magnetic separation tailings are obtained; the activation gas is a hydrogen-containing gas; and the temperature T is 1000 to 1300 DEG C. By means of the method, selective carbonization of niobium in the mineral can be achieved, and selective separation of niobium and titanium can be achieved.

The invention discloses a heat treatment process for improving the obdurability of die steel, and belongs to the technical field of metal heat treatment. The invention relates to a heat treatment process for improving the toughness of die steel, which adopts a die steel material with a specific component proportion, and the die steel material comprises carbon, chromium, molybdenum, vanadium, tungsten, nickel, niobium, niobium carbide and trace boron element. By sequentially implementing austenitizing, quenching, deformation heat treatment, multi-stage subzero treatment, pulsed magnetic field assisted tempering, gradient surface hardening and nano-precipitation regulation treatment, the hardness and toughness of the die steel are remarkably improved. Particularly, through the synergistic effect of multiple advanced heat treatment means, the martensite structure is effectively refined, carbide precipitation is strengthened, the surface hardness and the core toughness are improved, the comprehensive performance of toughness and toughness is achieved, and the method is suitable for the field of high-performance injection molds and hot-working molds.

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

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

The invention relates to the technical field of fasteners, and provides a high-strength bolt and a preparation process thereof. The high-strength bolt comprises a steel matrix and a reinforcing phase, and the steel matrix is composed of, by weight, 0.38%-0.45% of C, 0.8%-1.6% of Si, 0.9%-1.2% of Mn, 0.5%-0.9% of Cr, 0.01%-0.03% of Ti, 0.2%-0.5% of Mo, 0.005%-0.05% of Cu, 0.3%-0.8% of V and the balance Fe and inevitable impurities; the reinforcing phase comprises aluminum nitride and niobium carbide; the mass ratio of aluminum nitride to niobium carbide is 11: (1-9). By means of the technical scheme, the problem that in the prior art, the bolt strength is poor is solved.

The application discloses a method for preparing niobium carbide from aluminum niobium slag by fire reduction recovery. The method comprises the following steps: taking aluminum niobium slag, graphite powder and fluorite according to the mass ratio of 100:6-12:3-8, mixing them uniformly to obtain a mixture; loading the mixture into an electric arc furnace preheated to 700-900 DEG C and into which a protective gas is introduced, heating to 1750-2050 DEG C and keeping constant temperature for 2-4 hours, and then discharging aluminum slag mixture and niobium carbide alloy ingot after layering; crushing the niobium carbide alloy ingot, adding it into an alkaline solution according to the solid-liquid ratio of 1g:8-12ml, heating to 80-100 DEG C and stirring for 2-4 hours, filtering and washing with water until pH=7-8 while hot after the reaction, and then performing acid washing and drying. The application has wide raw material adaptation range, high niobium recovery rate and product purity, and obvious cost advantage.

The invention relates to the technical field of semiconductor materials, and particularly discloses a flexible flow guide ring, a preparation method and a silicon carbide crystal growth method applying the flexible flow guide ring. The flexible flow guide ring comprises any one or more of tantalum carbide, tungsten carbide, molybdenum carbide, niobium carbide and zirconium carbide. The preparation method of the flexible flow guide ring comprises the following steps: placing a flexible flow guide ring blank in heat treatment equipment containing silicon carbide powder or carbon powder, vacuumizing, filling argon, carbonizing, and obtaining the flexible flow guide ring after carbonization is finished. The silicon carbide crystal growth method using the flexible flow guide ring comprises the following steps: assembling the flexible flow guide ring and a crucible containing silicon carbide seed crystals and silicon carbide powder, transferring the crucible to a single crystal growth furnace after the assembly is completed, growing the silicon carbide crystals by using a PVT method, and obtaining the high-quality silicon carbide crystals after the growth is completed. The problems of crystal defects and flow guide ring cracking in the growth process of the silicon carbide crystal can be reduced.

The invention relates to a porous carbon coated cobalt elementary substance / niobium carbide heterojunction material as well as a preparation method and application thereof. The material comprises polyhedral hollow nitrogen-doped porous carbon and elemental cobalt / niobium carbide heterojunctions uniformly dispersed on the porous carbon. The preparation method comprises the following steps: by taking a zinc-cobalt bimetal-based zeolite imidazate metal organic framework material as a precursor, etching by using a tannic acid solution to obtain a macroporous structure; and after the niobium element is adsorbed, the porous carbon-coated cobalt elementary substance / niobium carbide heterojunction material can be prepared through high-temperature heat treatment. The material can be applied to a lithium-sulfur battery as a sulfur-based positive electrode carrier.

The invention belongs to the technical field of plasma thermal spraying, and discloses a preparation method and application of niobium powder for plasma thermal spraying, and the preparation method of the niobium powder comprises the following steps: S1, primary sintering: uniformly mixing niobium oxide and niobium carbide, then carrying out compression molding, and carrying out primary vacuum reduction sintering to obtain hydrogenated primary niobium; the primary sintering is segmented sintering: in the first stage, the sintering temperature is 1100-1200 DEG C; in the second stage, the sintering temperature is 1500-1600 DEG C; in the third stage, the sintering temperature is 1900-2000 DEG C; s2, primary niobium powder is prepared; s3, secondary sintering: firstly, uniformly mixing the primary niobium powder with a forming agent, then carrying out compression molding, and carrying out secondary vacuum sintering at the sintering temperature of 1900-2100 DEG C to obtain hydrogenated secondary niobium; and then, the hydrogenated secondary niobium is sieved and dehydrogenated to obtain niobium powder. The niobium powder preparation method has the advantages of being simple in technological process, high in production efficiency, low in energy consumption, small in pollution and the like, and the prepared niobium powder is uniform in particle size and low in oxygen content and completely meets the use requirement of thermal spraying.

A method for preparing niobium carbide (MXene) micro supercapacitors using a spray coating method includes the following steps: Using an HCl-LiF mixture as an etchant, a few-layer Nb₂CT is prepared by hydrothermal reaction at 180℃ for 24 hours. x MXene dispersion; a spray mask with a hollowed-out interdigitated pattern is prepared using laser marking; the mask is adhered to a flexible substrate and placed on a 200℃ heating platform, with a spraying pressure of 0.2-0.5 MPa and a nozzle distance of 10-20 cm, and the dispersion is uniformly sprayed onto the hollowed-out areas of the mask. By controlling the number of spray passes, a binder-free patterned interdigitated electrode is directly formed; a PVA / H2SO4 gel electrolyte is prepared and coated onto the electrode surface, and after encapsulation, a flexible micro supercapacitor is obtained. This invention has a simple and controllable process, and the resulting device has high capacity, excellent flexibility, and long cycle stability, making it suitable for wearable electronic devices.

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.

A preparation method of niobium carbide powder, carbon-containing material, silicon reducing agent, niobium concentrate are sequentially added into a mixing tank, mixed uniformly to obtain mixed raw materials; the mixed raw materials are put into an electric furnace, the electric furnace is heated, the material smelting temperature is gradually maintained, the molten pool temperature reaches 1600 DEG C to 1800 DEG C, after the mixed raw materials are completely melted, the heat preservation reaction is continued for 1 hour, the smelting is finished, the molten slag is poured out, the slag-iron separation is carried out, the carbon-containing niobium-iron alloy is obtained, and the carbon-containing niobium-iron alloy block is crushed; the carbon-containing niobium-iron alloy block is put into a reaction tank, water, inorganic acid, solubilizing agent and oxalic acid are sequentially added as leaching liquid, dissolution leaching is carried out, centrifugal separation is carried out, the solid materials are subjected to multi-stage countercurrent washing, and the niobium carbide powder is obtained. The advantages are: short process flow, low energy consumption, strong operability, easy control of reaction process, high production efficiency, high yield, short production cycle, the obtained niobium carbide product is in powder shape, and high hardness niobium carbide does not need to be crushed.

The present invention relates to the field of materials science and technology, and specifically relates to a high-strength cemented carbide and its preparation method and application, which includes the following steps: S1: Weigh the raw materials of tungsten carbide, cobalt, tantalum carbide, niobium carbide, titanium carbide, yttrium oxide, nickel, and trace strengthening elements according to a preset weight to form a mixture A; S2: Place the mixture A in a wet ball milling device for ball milling treatment; S3: Perform drying treatment on the ball-milled slurry; S4: Perform plasma activation treatment on the dried powder; S5: Press the activated powder to form a dense green compact; S6: Perform two-stage sintering treatment on the green compact in a vacuum sintering furnace; S7: After sintering is completed, perform cooling treatment; In the present invention, by optimizing the alloy formula and innovating the preparation process, the hardness, toughness, and high-temperature resistance of the high-strength cemented carbide are improved, and at the same time, the production process is simplified, and the overall performance and application versatility of the material are enhanced.

The invention provides alloy stainless steel and an application method thereof in beer barrel voltage divider casting, and the method comprises the following steps: determining that the molar ratio of Nb to C is greater than 8 according to the alloy stainless steel, and fixing carbon and nitrogen elements by forming niobium carbide and niobium nitride; the alloy stainless steel is adopted for preparing the beer barrel voltage divider, and the alloy stainless steel is treated through a precision casting method to form the beer barrel voltage divider; the beer barrel pressure divider is smelted and poured through the precision casting method, and a poured mold shell is obtained and subjected to annealing treatment.

The application discloses an alloy material and a preparation method and a mold thereof. The alloy material comprises tungsten carbide, a binder phase, tantalum carbide, chromium, and a carbon compound, wherein the carbon compound comprises at least one of titanium carbide, niobium carbide and vanadium carbide. The mold prepared from the alloy material can be used for preparing lithium battery tabs. The material has good wear resistance, and is not prone to wear, corner collapse, fatigue cracks and the like in high-frequency and high-impact tab stamping operations, so that the service life of the mold is long, and the production continuity and tab forming precision are not affected.

The invention provides high-hardness easy-to-process ultra-low carbon stainless steel which comprises the following chemical components in percentage by mass: 16-20% of chromium, 8-14% of nickel, 0-3% of molybdenum, 0.15-0.20% of niobium, 0.1-0.3% of nitrogen, less than or equal to 0.03% of carbon and the balance of iron. The preparation method comprises the following steps: S1, proportioning the raw materials; s2, raw material smelting; S3, decarburization refining; S4, component adjustment; S5, ingot casting preparation; s7, steel billet heat treatment; s8, surface treatment machine processing; and S9, product detection and warehousing. 0.15-0.20% of niobium (Nb) and 0.1-0.3% of nitrogen (N) are added into the molten steel, trace niobium nitride and niobium carbide hardened phases are generated during solidification, and stabilization treatment at 850-930 DEG C is added in the subsequent heat treatment procedure, so that niobium nitride and niobium carbide precipitates are dispersed and separated out, the hardness of the casting reaches HB180-220, and the machining cutting performance of the casting is improved.

This application belongs to the field of NbC material preparation technology, specifically a method for preparing niobium carbide by flash sintering and the niobium carbide itself. The preparation method includes the following steps: mixing niobium iron powder and carbon powder and pressing them into a compact, then vacuum drying to obtain a compact; placing the compact between two sheets of carbon paper and flash sintering it under vacuum, then cooling to obtain a sintered body; crushing and pulverizing the sintered body, then screening and separating it to obtain niobium carbide. This application utilizes flash sintering technology to significantly shorten the NbC preparation time, thereby reducing the production cycle, improving production efficiency, and significantly reducing energy consumption; the process flow is short, the operation is simple, and the reaction process is easy to control; by reducing the sintering temperature, shortening the process cycle, and reducing energy consumption, while ensuring the performance of NbC, the preparation cost and carbon emissions are effectively reduced, which is in line with the technological trend of green manufacturing and sustainable development.

The present application belongs to the technical field of hard alloy material, and particularly relates to a hard alloy for hard rock tooth and a preparation method thereof. The method comprises the following steps: mixing coarse tungsten carbide powder, submicron tungsten carbide powder, cobalt powder, nickel powder, chromium carbide powder, vanadium carbide powder, tantalum carbide powder, niobium carbide powder, dimolybdenum carbide powder, graphite powder, tantalum-niobium-zirconium composite carbide solid solution pinning body and yttrium-doped cerium oxide toughening control body, ball milling, drying, crushing, sieving, granulating, die pressing, cold isostatic pressing, degreasing, vacuum sintering, hot isostatic pressing treatment, grinding, cleaning and drying. The present application can inhibit grain growth by multiple carbides, and can improve the grain boundary and binder phase distribution by using rare earth oxides, so that the obtained hard alloy has good wear resistance, impact resistance and anti-chipping performance, and is suitable for hard rock tooth.

The invention relates to a method for determining the content of free carbon in tantalum carbide or niobium carbide, and belongs to the technical field of material chemical analysis. The method comprises the following steps: reacting a tantalum carbide or niobium carbide sample with protonic acid under a heating condition, so that metal carbide is dissolved and free carbon is not dissolved; filtering the reaction liquid, separating out free carbon solid residues, and carrying out water washing and drying treatment; and then burning the residues in an oxygen atmosphere, and measuring the amount of generated carbon dioxide by utilizing infrared detection or other means, so as to calculate the content of free carbon in the sample. The method disclosed by the invention has the advantages of high determination precision, simplicity and convenience in operation and wide applicability, fills the technical blank of accurate quantitative analysis of free carbon in tantalum (niobium) carbide, and has important significance on preparation and quality control of high-purity tantalum and niobium metal materials.

The invention relates to an interface optimization method for improving performance and stability of an organic photovoltaic device, the organic photovoltaic device comprises a transparent substrate, an anode, a hole transport layer, an organic active layer, an electron transport layer and an electrode which are sequentially arranged from bottom to top, and the organic photovoltaic device is characterized in that the hole transport layer is formed by doping a niobium carbide two-dimensional material Nb2C MXene in a PEDOT: PSS aqueous solution, and carrying out spin coating on the PEDOT: PSS-Nb2C mixed solution, so as to obtain the PEDOT / PSS-Nb2C composite material. According to the invention, PEDOT: PSS is modified by using a 2D material, and an ultrathin metal oxide is inserted into an ITO-PEDOT: PSS interface by using an atomic layer deposition method, so that efficient and stable successful preparation of OPVs is realized.

The application provides a kind of high hardness easy-to-machine ultra-low carbon stainless steel, by mass percent, chemical composition includes: chromium 16-20%, nickel 8-14%, molybdenum 0-3%, niobium 0.15-0.20%, nitrogen 0.1-0.3%, carbon ≤0.03%, the balance is iron. It also includes its preparation method, including S1: raw material proportioning;S2: raw material smelting;S3: decarburization refining;S4: component adjustment;S5: preparation of ingot;S6: ingot hot deformation breakdown processing;S7: billet heat treatment;S8: surface treatment processing;S9: product detection into warehouse. The application adds 0.15~0.20 niobium (Nb) elements and 0.1~0.3% nitrogen (N) elements in molten steel, generates trace amounts of niobium nitride and niobium carbide hardening phase during solidification, and increases 850~930℃ stabilization treatment in subsequent heat treatment process, makes niobium nitride and niobium carbide precipitate and disperse, makes the hardness of castings reach HB180~220, thereby improves the machining cutting performance of castings.

The application discloses a kind of chalcogenide glass aspherical lens mould pressing mould core material and preparation method thereof, belong to infrared optical device manufacturing technical field.The mould core material is made of composite powder including niobium carbide powder, chromium carbide powder and metal nickel powder by discharge plasma sintering, wherein the mass content of nickel powder is 0wt% to 2wt%, the mass ratio of niobium carbide and chromium carbide is 30~35:65~70.The material is up to 8.5×10 ‑6 / K~9.5×10 ‑6 / K at 600 DEG C, and is well matched with chalcogenide glass, while having high hardness (1700~1900 HV30) and high fracture toughness (6.0~7.0 MPa·m¹ / ²).The preparation method key includes powder mixing under inert atmosphere, mould pre-pressing, and using gradient temperature and gradient pressure SPS sintering process.The application effectively solves the lens breakage and demoulding difficulty problem caused by insufficient thermal expansion coefficient of traditional mould material, and significantly improves the qualified rate of chalcogenide glass mould pressing.

The invention discloses high-temperature-resistant special ceramic and a preparation method thereof, and belongs to the technical field of special ceramic. The high-temperature-resistant special ceramic is prepared from the following raw materials in parts by weight: 49-55 parts of bauxite, 3-5 parts of forsterite, 18-20 parts of fly ash, 19-22 parts of willemite, 1-2 parts of niobium carbide, 2-4 parts of nano molybdenum oxide and 2-3 parts of chromium aluminum phosphate. Through interaction of various raw materials, the strength during premixing is improved, oxycarbide can be volatilized during high-temperature firing, the overall characteristics of the special ceramic are not affected, and meanwhile, the special ceramic has good high-temperature resistance; by optimizing the ball milling rotating speed, the screening process and the vacuum hot pressing sintering process, the uniformity and stability of the ceramic material are ensured, so that the comprehensive performance of the high-temperature-resistant special ceramic is effectively improved, and the prepared ceramic is excellent in performance.

The present invention provides a conductive pattern, a method of manufacturing the same, and a display device including the conductive pattern. The conductive pattern includes a metal layer and a first low-reflection layer disposed on a first surface of the metal layer, and the first low-reflection layer includes niobium carbide (NbC) and zinc oxide (ZnO). Since the display device according to an exemplary embodiment includes the conductive pattern, the reflectance of the display device is reduced, and the visibility of an image displayed from the display device is improved.

To provide brake discs that are highly resistant to corrosion and wear, less prone to delamination and interlayer break-up, and ensure thermal and mechanical performance, thereby demonstrating long-term reliability. [Solution] The brake band is made of gray cast iron or steel, and the disc has a base layer that covers at least one of the two braking surfaces of the brake band. The base layer consists of a titanium and / or titanium alloy matrix containing one carbide and defines the tribologically active surface of the disc. Alternatively, the base layer consists of a layer of titanium and / or titanium alloy, and the coating layer on top of it consists of a layer based on one or more carbides and defines the tribologically active surface of the disc. The one or more carbides are selected from the group consisting of titanium carbide, tungsten carbide, chromium carbide, niobium carbide, molybdenum carbide, and silicon carbide. An intermediate fusion layer exists at the interface between the base layer and the gray cast iron or steel brake band. The base layer has a crystalline structure, and its growth direction is mainly perpendicular to the braking surface.

The present invention relates to a stainless steel flux-cored wire and a preparation method thereof, and relates to the technical field of flux-cored wires. The stainless steel flux-cored wire comprises a stainless steel strip and a double-layer flux core, wherein the double-layer flux core is filled in the stainless steel strip, and the filling amount of the double-layer flux core is 20-25% of the total mass of the stainless steel flux-cored wire; the double-layer flux core comprises a rapid reaction layer and an alloy transition layer, the rapid reaction layer comprises an oil stain oxidant, the oil stain oxidant comprises a high-temperature decomposition type organic substance and an inorganic composition, the inorganic composition comprises copper oxide and ferric oxide with a mass ratio of 1-1.5:1, the high-temperature decomposition type organic substance comprises polytetrafluoroethylene fine powder and trisodium citrate with a mass ratio of 1:3-5, and the alloy transition layer comprises 316L stainless steel powder, metal powder, silicon powder, niobium carbide and rare earth oxide. The present invention can effectively avoid that compounds in the rust preventive oil remaining on the surface of the wire during welding are liable to form diffusible hydrogen and enter the weld seam to cause hydrogen embrittlement.