704 results about "Titanium carbide" patented technology

The invention provides a polysilazane green special refractory ceramic coating and a preparation method thereof, and belongs to the field of ceramic coatings. The ternary core material composed of titanium carbide, zirconium boride and silicon nitride provides high hardness, oxidation resistance, thermal shock resistance and excellent thermal stability; the silicon dioxide-aluminum oxide composite shell layer remarkably improves the oxidation resistance and reliability of the coating through the synergistic oxidation resistance and crack self-repairing function; the multi-metal oxygen cluster network endows the coating with excellent electrical conductivity, thermal conductivity and corrosion resistance; the intercalated montmorillonite enhances the crack resistance and oxidation resistance through a layered structure and embedded active ions; and the boron nitride coated vanadium carbide particles provide lubricity, oxidation resistance and wear resistance. Through collaborative optimization of multiple components, the comprehensive performance of the coating is comprehensively improved in the aspects of oxidation resistance, thermal conductivity, interface stability, high-temperature performance, mechanical performance and the like, so that the coating shows excellent long-term stability and functionality in an extreme environment.

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

The invention discloses an Al-Ti-C-Ce intermediate alloy with titanium carbide as a Ti source and a C source and a preparation method and application thereof.The preparation method comprises the steps that titanium carbide powder and aluminum powder are mixed and subjected to ball milling to obtain core-shell structure composite powder with TiC coated with Al, the core-shell structure composite powder is subjected to compression molding to obtain prefabricated blocks, the prefabricated blocks are pressed into the bottom of an aluminum melt in batches through a graphite bell jar, and the aluminum melt is subjected to heat treatment to obtain the Al-Ti-C-Ce intermediate alloy with the Ti source and the C source. The preparation method comprises the following steps: adding an Al-30Ce intermediate alloy, carrying out first heat preservation at 760-850 DEG C, cooling to 700-750 DEG C, adding the Al-30Ce intermediate alloy, carrying out second heat preservation, deslagging and refining, and pouring into a mold to obtain the Al-Ti-C-Ce intermediate alloy; according to the Al-Ti-C-Ce intermediate alloy provided by the invention, A356 alloy grains are refined to 106 microns (ASTM 5 level), and a low-content system can still maintain the refining level that the grain size is smaller than 120 microns.

The invention provides dual-response antibacterial repair-promoting injectable hydrogel as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. Two-dimensional titanium carbide (TiO2 (at) MXene) with the surface modified with titanium dioxide and a bioactive substance are introduced into a hydrogel matrix to serve as functional additives, TiO2 (at) MXene is a photo-thermal and ultrasonic response material, can emit heat under 808 nm near-infrared (NIR) light irradiation and low-intensity pulsed ultrasound (LIPUS) stimulation, and can generate reactive oxygen species (ROS) for sterilization under LIPUS stimulation; when the temperature of the hydrogel is increased, the bioactive substances can be slowly released from the hydrogel, and cell proliferation and tissue repair are promoted. The hydrogel provided by the invention can be coated on the surface of skin or injected under soft tissue, so that the functions of resisting bacteria in the early stage of inflammation and promoting tissue repair in the later stage are realized.

The invention belongs to the field of preparation of a lithium ion battery positive electrode material, and particularly relates to an organic metal framework coated lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. According to the scheme, a lithium cobalt oxide material, methanol, dimethyl imidazole cobalt, titanium carbide and sodium dihydrogen phosphate monohydrate are mixed according to the mass ratio of 1: (0.070-0.080): (0.001-0.002): (0.001-0.003): (0.001-0.002) and sintered, and the lithium cobalt oxide positive electrode material coated with the organic metal frame is obtained. According to the scheme, by utilizing the synergistic effect of a metal organic framework coating layer formed by pyrolysis of dimethyl imidazole cobalt, a three-dimensional conductive network constructed by titanium carbide and a phosphate interface layer, the mechanical strength of the coating layer is synergistically improved, lithium ion diffusion is accelerated, the internal resistance of the battery is reduced, the side reaction of an electrode / electrolyte is reduced, and the volume expansion of lithium cobalt oxide and cobalt dissolution are inhibited; and the high-temperature cycling stability and the rate capability of the lithium cobalt oxide battery are obviously improved. Meanwhile, the invention also provides an application of the organic metal framework coated lithium cobalt oxide positive electrode material in a battery.

The invention relates to a superfine hard alloy cutter and a preparation method thereof, and belongs to the technical field of hard alloy products, and the preparation method comprises the following steps: carrying out ball milling and sieving on tungsten carbide powder, titanium carbide powder, modified cobalt powder and reinforced composite powder to obtain hard alloy powder; and the hard alloy powder is subjected to spark plasma sintering and then subjected to vacuum heat treatment, and the superfine hard alloy cutter is obtained. According to the technical scheme, a vanadium source, a yttrium source and a cobalt source are mixed through a spray conversion method to prepare modified cobalt powder; nano particles and a reinforcing material are combined through electrostatic adsorption to prepare reinforced composite powder; the modified cobalt powder and the reinforced composite powder not only can inhibit the growth of tungsten carbide grains, but also effectively improve the hardness, bending strength and fracture toughness of the hard alloy, further improve the mechanical property, thermal stability and wear resistance of the superfine hard alloy cutter, and generally improve the comprehensive performance of the superfine hard alloy cutter. And the service life is prolonged.

This invention discloses an Al-Ti-C-Ce master alloy using titanium carbide as both Ti and C sources, its preparation method, and its application. Titanium carbide powder is mixed with aluminum powder and ball-milled to obtain an Al-coated TiC core-shell composite powder. The core-shell composite powder is pressed into preforms. These preforms are then pressed into the bottom of molten aluminum in batches using graphite bell jars. The mixture is first held at 760-850℃, then cooled to 700-750℃. An Al-30Ce master alloy is then added, followed by a second holding period. The mixture is then slag-removed and refined, and finally cast into a mold to obtain the Al-Ti-C-Ce master alloy. The Al-Ti-C-Ce master alloy provided by this invention refines the grain size of A356 alloy to 106 μm (ASTM grade 5), and even in low-content systems, a grain size refinement level of less than 120 μm can be maintained.

The invention relates to the technical field of welding materials, in particular to a titanium carbide reinforced iron-based wear-resistant corrosion-resistant flux-cored wire for surfacing on the surface of a conveying roller. According to the specific technical scheme, the flux core comprises, by mass, 10%-20% of graphite, 25%-35% of ferrotitanium, 2%-6% of ferrovanadium, 3%-8% of electrolytic manganese metal, 2%-10% of ferromolybdenum, 5%-15% of ferrosilicon, 2% of aluminum-magnesium alloy and the balance Fe powder. According to the flux-cored wire prepared through the flux core, the surfacing alloy obtained through electric arc surfacing is good in surfacing manufacturability, attractive in weld joint forming and small in surface air hole number, and the flux-cored wire has high hardness, high-temperature abrasion resistance and corrosion resistance.

The invention discloses a nano-diamond reinforced powder metallurgy brake pad friction body material and a preparation method thereof, and relates to a brake pad friction body material and a preparation method thereof. The problem that in the prior art, the stability of a braking system of a train at a high running speed cannot be achieved is solved. The friction body material comprises a matrix component, a lubricating component, a friction component and a basic reinforcing component, wherein the sum of the mass percentages of the matrix component, the lubricating component, the friction component and the basic reinforcing component is 100%; wherein the mass percent of the copper powder in the matrix component is 50%-70%, and the mass percent of the iron powder in the matrix component is 10%-30%; the mass percent of the lubricating component is 10%-20%; the mass percent of the friction component is 1%-5%; the mass percent of the nano-diamond in the enhanced component is 0.1%-1%; the friction component is composed of one or more of silicon dioxide, aluminum oxide, titanium carbide, tungsten carbide, silicon carbide powder and zirconium oxide powder; the lubricating component is composed of one or more of graphite, carbon nanotubes and molybdenum disulfide. Belongs to the technical field of powder metallurgy.

The application discloses a high-temperature-resistant and high-barrier composite film and a preparation method thereof, and relates to the technical field of layered products, which comprises A, B and C layers in sequence; the A layer comprises a temperature-resistant layer, a substrate layer and a barrier layer in sequence; the B layer comprises a substrate layer, a connecting layer, a barrier layer, an aluminum plating layer and a protective layer in sequence; the C layer is a heat-sealing layer; the preparation raw materials of the temperature-resistant layer material comprise aluminum oxide and titanium nitride; the preparation raw materials of the barrier layer material comprise ethylene-vinyl alcohol copolymer, succinamic acid, furoinic acid and carbon nanotubes; and the preparation raw materials of the heat-sealing layer material comprise titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate. The high-temperature-resistant and high-barrier composite film provided by the application has excellent high-temperature resistance and barrier properties.

The invention provides a titanium carbide preparation process, and relates to the technical field of carbide preparation, the titanium carbide preparation process comprises the following steps: S1, selecting ilmenite with the phosphorus content of less than 100 ppm, crushing, reducing, concentrating, hydrolyzing, washing and filtering to generate a titanium dioxide filter cake; the pore diameter of titanium dioxide is controlled to be 1-5nm, the phosphorus content is less than 50ppm, and the sulfur content is less than 0.1%; s2, pulping the titanium dioxide filter cake obtained in the step S1 to form primary slurry, adding carbon black according to the content of titanium dioxide, and uniformly stirring to form secondary slurry; s3, continuously stirring the secondary slurry, and pumping the secondary slurry into a spray dryer for spray drying to generate titanium dioxide-carbon black particles; and S4, the titanium dioxide-carbon black particles pass through a high-temperature roasting area under the action of airflow and gravity to generate titanium carbide powder. According to the method, the mixing uniformity of the carbon black is larger than or equal to 95%, the yield of the titanium carbide is increased to 99.5% or above, and the quality and the yield of the finished titanium carbide are greatly improved.

The invention relates to the technical field of brake pads, in particular to a brake pad capable of reducing abrasion of a brake disc and a preparation technology thereof.The brake pad comprises, by weight, 20%-32% of reinforcing fibers, 12%-18% of a binder, 22%-34% of a friction regulator and 24%-38% of filler and functional additives, the reinforced fibers are at least one of titanium carbide coated carbon fibers, steel fibers and aluminum silicate ceramic fibers. According to the invention, the reinforced fibers construct a high-strength heat conduction network, and heat is quickly dispersed to reduce thermal stress concentration; the binder ensures the structural stability at high temperature; the friction regulator optimizes a friction coefficient curve through the synergistic effect of lubrication and friction increasing, and high-temperature fluctuation is avoided; the filler and the functional additive enhance the heat absorption and buffering capability, and adjust pores to relieve thermal shock. All the components have a synergistic effect, so that hot cracks of the brake disc can be reduced, and the crack resistance and the brake stability under extreme working conditions are improved.

The invention provides a PCBN composite material and a preparation method thereof.The preparation method comprises the steps that two or more of zirconium oxide, titanium nitride, silicon nitride, titanium diboride, silicon carbide, titanium carbide, titanium carbonitride, aluminum oxide and aluminum nitride are mixed, and ceramic composite powder is prepared; the CBN micro powder and a metal binding agent are subjected to ball milling and mixing, and CBN pre-composite micro powder is prepared; mixing the CBN pre-composite micro powder with the ceramic composite powder to obtain a premix, placing the premix in a mold for pre-pressing to obtain a blank piece, and then assembling the blank piece for sintering to obtain a PCBN composite material; the mass percentage content of the ceramic composite powder is 5%-40%, the mass percentage content of the metal binding agent is 15%-30%, and the mass percentage content of the CBN micro powder is 45%-65%. According to the method, the toughness and the stability of the PCBN cutter can be improved on the premise of low content of CBN (Cubic Boron Nitride).

Tungsten powder, molybdenum powder, titanium carbide powder and tungsten-copper composite powder are mixed to obtain mixed powder, the mixed powder is pressed and formed to obtain a formed blank, the formed blank is sintered to obtain a ceramic reinforced tungsten framework, the ceramic reinforced tungsten framework is subjected to copper infiltration treatment, and the tungsten-infiltrated copper material is obtained. Titanium carbide and molybdenum are introduced when the tungsten framework is sintered, the strength of the tungsten framework is effectively improved through the solid solution strengthening effect of molybdenum and the second phase strengthening effect of titanium carbide, then the high-temperature strength of the tungsten infiltrated copper material is remarkably improved, meanwhile, the density of the material can be reduced, and weight reduction of tungsten infiltrated copper is achieved. Besides, in the process of sintering the ceramic reinforced tungsten framework, superfine tungsten-copper composite powder is introduced, the sintering performance of the tungsten framework can be remarkably improved, the subsequent copper infiltration effect can be optimized, and therefore the tungsten infiltrated copper material is uniform in component structure, the ablation resistance of the light ablation-resistant tungsten infiltrated copper material is excellent, and the density is greatly reduced compared with existing tungsten infiltrated copper.

The invention discloses a PET solid medicinal hard sheet and a preparation method thereof, the PET solid medicinal hard sheet comprises PET, a stabilizer, a plasticizer, a lubricant and an antioxidant, the stabilizer comprises a modified nano titanium carbide sheet, hydroxymethyl cellulose and a stability regulator, the modified nano titanium carbide sheet contains Ti3C2A, and A is an oxygen-containing or fluorine-containing functional group. According to the invention, the interaction between the modified nano titanium carbide sheet and hydroxymethyl cellulose is utilized to form a sheet-line combined structure with a limiting effect on the plasticizer, so that the emigration rate of the plasticizer is greatly reduced, and meanwhile, the stability of the material is also well promoted.

The invention relates to the technical field of alloy powder preparation, and particularly discloses alloy powder for laser surfacing and a preparation method thereof, and the alloy powder for laser surfacing comprises 8-12% of nickel (Ni), 4-6% of chromium (Cr), 2-3% of molybdenum (Mo), 1-2% of boron (B), 10-15% of titanium carbide (TiC), 0.5-1% of yttrium oxide (Y2O3), 0.5-1% of silicon (Si), 0.1-0.3% of carbon (C) and the balance of iron (Fe). Fe is used as a matrix, corrosion-resistant and solution strengthening elements such as Ni, Cr and Mo are accurately matched, a low-content Y2O3 rare earth element and a TiC nano strengthening phase are introduced, Y2O3 effectively inhibits grain coarsening in the surfacing process, the brittleness problem caused by the traditional high rare earth content is avoided, TiC nano particles are evenly dispersed in the matrix and form a composite strengthening structure with a Cr7C3 hard phase, the hardness of a surfacing layer is improved, and the hardness of the surfacing layer is improved. The wear-resistant life is prolonged.

The invention relates to the field of laser cladding powder, in particular to wear-resistant and corrosion-resistant laser cladding powder and a preparation method thereof. The laser cladding powder is used for solving the problem that a cladding layer formed by existing laser cladding powder is poor in abrasion resistance and corrosion resistance. According to the laser cladding powder, the carbon nano tube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder are added, and the carbon nano tube and the lanthanum-yttrium oxide have a synergistic effect to refine grains, so that the corrosion resistance of a cladding layer is improved, and the carbon nano tube has good wear resistance; after the surface of the titanium diboride powder is coated with the copolymer, the dispersity of the titanium diboride is improved, a product decomposed by the copolymer reacts with the titanium diboride under the action of laser to generate titanium carbide, and the wear resistance of a cladding layer is enhanced; the laser cladding powder is suitable for prolonging the service cycle of a mold, can be used for surface strengthening of mine equipment parts, enhances the wear resistance and corrosion resistance of the mine equipment parts, reduces the maintenance frequency of the equipment, and can provide an effective solution for surface strengthening of parts in various industrial fields.

The invention belongs to the technical field of laser cladding materials, and particularly relates to Fe-based titanium carbide-tungsten carbide alloy powder, a laser cladding layer and a preparation method of the laser cladding layer. The Fe-based titanium carbide-tungsten carbide alloy powder provided by the invention comprises TiC powder, WC powder and Fe-based alloy powder, the ratio of the total mass of the TiC powder and the WC powder to the mass of the Fe-based alloy powder is 1: (1-4). According to the invention, TiC powder and WC powder are mixed for use, and hard particles are formed on the surface and the bottom of the coating after laser cladding, so that the coating has dual wear-resistant effects; and meanwhile, the TiC powder with lower price is adopted to replace part of WC powder, so that the production cost can be reduced.

The invention belongs to the field of metal material processing, and particularly relates to a multi-element nickel alloy composite welding wire with low thermal crack sensitivity and a preparation method of the multi-element nickel alloy composite welding wire with the low thermal crack sensitivity. The welding wire comprises the following powder raw materials in parts by weight: 0.01 to 0.05 percent of C, 0.10 to 0.20 percent of Si, 28.5 to 30.5 percent of Cr, 7.0 to 11.0 percent of Fe, less than or equal to 1.0 percent of Mn, 1.0 to 2.0 percent of Co, 4.0 to 5.0 percent of Mo, 0.001 to 0.005 percent of B, 0.1 to 0.2 percent of Al + Ti, 0.005 to 0.020 percent of Zr, 1.0 to 2.0 percent of Nb, 0.1 to 0.4 percent of Ta, 0.5 to 1.0 percent of Sn, 0.20 to 0.30 percent of RE, less than 0.005 percent of S, less than 0.005 percent of P and the balance of Ni. And the plating layer comprises a titanium carbide layer and a nickel layer from inside to outside. A welding wire raw material is subjected to smelting, high and low temperature refining, annealing, forging and rolling, multi-pass drawing-annealing, solid solution-aging treatment and acid pickling, coating and plating to obtain the nickel-based alloy welding wire, and the problems that in the prior art, when a nickel-based alloy welding material is used for welding, cracks are prone to being generated, and the strength is low due to hot corrosion can be effectively solved.

The invention relates to a preparation method of an ultra-dispersion nano titanium carbide particle reinforced titanium-based composite material, which comprises the following steps: carrying out die forming on mixed powder of sub-ten nano-scale graphene and a titanium matrix, carrying out vacuum microwave sintering, and carrying out extrusion thermal deformation treatment to obtain the ultra-dispersion nano titanium carbide particle reinforced titanium-based composite material. The microstructure reveals that the nano-scale titanium carbide particles generated by the in-situ reaction are uniformly distributed in the matrix crystal. The prepared ultra-dispersed nano titanium carbide reinforced titanium-based composite material shows excellent mechanical properties and has excellent strength and plasticity, the tensile strength at the room temperature can reach 1030-1150 MPa, and the performance is obviously improved compared with pure titanium.

The present invention discloses a biomass aerogel-based seawater evaporator with controllable pore size and a preparation method thereof. In the present invention, a wood fiber suspension is mixed with carboxymethyl nanocellulose, and the mixture is sequentially subjected to directional freezing, freeze drying, acetylation, and cleaning, and then a titanium carbide photothermal layer is sprayed on the top to obtain a biomass aerogel-based seawater evaporator. The biomass aerogel-based seawater evaporator prepared by the present invention has low density, high porosity, and high light absorption rate. Compared with other biomass-based seawater evaporators, the evaporator obtained by the present invention can adjust the pore size of the aerogel by controlling the carboxymethyl nanocellulose content, thereby balancing the evaporation enthalpy and water transfer rate of the evaporator to obtain excellent seawater evaporation efficiency, showing great application prospects in the field of seawater desalination.

The invention discloses a heat treatment process for spring processing and production, and belongs to the technical field of metal material heat treatment, the heat treatment process for spring processing and production comprises the following steps: detecting element content through laser-induced breakdown spectroscopy, and dynamically adapting parameters such as quenching temperature by using a reinforcement learning algorithm; calculating the critical concentration of titanium carbide based on JMatPro, monitoring the component gradient of a cladding layer in real time, and adjusting the laser power, the powder feeding rate and the cladding path; acquiring temperature field and stress field data by using a sensor, and adjusting the magnetic field intensity, the pre-deformation amount and the flow velocity of a cooling medium; a metallographic image is analyzed through a convolutional neural network, subzero treatment is intelligently triggered, and tempering parameters are optimized; and according to the surface roughness, parameters are reversely corrected, and self-optimization is carried out through the block chain. Intelligent and accurate regulation and control of the whole process of component detection, process control and quality detection are achieved, the mechanical property and production efficiency of the spring are improved, and the method has the advantages of dynamic adaptation, real-time monitoring, multi-field coupling control, data closed-loop optimization and the like.

The invention provides a secondary battery and a preparation method thereof, an energy storage system and electric equipment, and relates to the technical field of energy storage. The method comprises the following steps: assembling a positive plate, a diaphragm and a negative plate, injecting an electrolyte to obtain a secondary battery, and sequentially mixing, coating and drying a first positive active material, nano SiO2, two-dimensional titanium carbide, a first conductive agent, a first binder and a first solvent to form a coating; mixing, coating and drying a second positive electrode active material, a carbon nanotube, a second conductive agent, a second binder and a second solvent in sequence to form a coating; a third positive electrode active material, an azobenzene group modified fluorinated acrylate copolymer, a third conductive agent, a third binder and a third solvent are sequentially mixed, coated, subjected to edge ultraviolet light curing treatment and dried, and the positive electrode plate is obtained. The preparation method is helpful for reducing the edge bulging phenomenon of the positive plate in the coating process, and is helpful for improving the capacity and the cycling stability of the secondary battery.

The invention belongs to the field of high-thermal-conductivity composite materials, and particularly relates to a 3D printing copper-diamond composite high-thermal-conductivity material and a preparation method thereof.The 3D printing copper-diamond composite high-thermal-conductivity material comprises a copper matrix and diamond particles dispersed in the copper matrix, and the surfaces of the diamond particles are provided with metal coatings; the copper matrix is formed by copper powder with the particle size of 10-100 microns, and the volume fraction of the diamond particles in the composite material is 40%-50%; according to the method, the titanium plating layer is prepared on the surface of the diamond, the stable titanium carbide transition layer is formed through the reaction of titanium and carbon, the interface thermal resistance between the diamond and copper is remarkably reduced, the interface bonding strength is improved, and heat conduction is facilitated. The selected area green laser 3D printing technology is adopted, a green laser device shows remarkable advantages in the field of 3D printing of copper alloy, and the heat conductivity of the prepared composite material can reach and is remarkably higher than that of pure copper by optimizing the diamond volume fraction and 3D printing process parameters.

The invention relates to the technical field of silicon carbide ceramic material processing, in particular to a preparation method of a silicon carbide ceramic-based composite material based on parameter optimization. Adding carbon fibers into a sodium hydroxide solution, and carrying out ultrasonic oscillation to obtain alkali-treated carbon fibers; the preparation method comprises the following steps: adding alkali-treated carbon fibers into a silver-ammonia solution, adding a glucose solution, heating in a water bath, washing to be neutral to obtain pretreated carbon fibers, forming a titanium carbide layer by adopting a radio frequency magnetron sputtering method, forming a silicon carbide layer by adopting the radio frequency magnetron sputtering method again, weaving to obtain carbon fiber cloth, and depositing silicon carbide to obtain a silicon carbide preform; and placing the silicon carbide preform in a vacuum reaction sintering furnace to prepare the silicon carbide ceramic-based composite material. The temperature of the sintering furnace can be optimally controlled, and the mechanical property of the silicon carbide ceramic-based composite material is improved.

The invention discloses a ceramic guide rail for an ultra-precision machining and ultra-precision measuring instrument and a preparation method of the ceramic guide rail in the field of ceramic materials. The ceramic guide rail comprises the following raw materials: 40-58% of nano alpha-Al2O3; 10 to 15% of titanium carbide; 5-8% of boron nitride; 5% to 10% of a Y2O3-MgO compound; 3-5% of zirconium oxide; 1 to 2 percent of La2O3; 0.5 to 1.5 percent of graphene; and 2 to 5% of nano CeO2 coated Al2O3 core-shell particles. The ceramic guide rail disclosed by the invention has excellent wear resistance, dimensional stability and thermal mechanical property, and is particularly suitable for guiding parts of ultra-precision machining equipment and measuring instruments.

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 present invention provides a zinc oxide / titanium dioxide / titanium carbide composite microwave absorbing material and a preparation method thereof, belonging to the technical field of electromagnetic wave absorbing materials. The method first adds Ti3C2T x nanosheets into deionized water and stirs evenly to obtain a Ti3C2T x nanosheet suspension; dissolves Zn(CH3COO)2·2H2O in methanol to obtain a Zn(CH3COO)2·2H2O solution; finally mixes the two solutions, transfers them to a Teflon-sealed autoclave for reaction, and performs heat treatment in a tubular furnace under an argon atmosphere to obtain a zinc oxide / titanium dioxide / titanium carbide composite microwave absorbing material. The composite microwave absorbing material has a rose-shaped, sandwich-like hamburger-shaped or spiny sea urchin-shaped structure. By partially oxidizing titanium carbide and introducing a material with a moderate dielectric constant, a zinc oxide / titanium dioxide / titanium carbide composite microwave absorbing material with a special morphology is prepared to improve the problem of limited microwave absorbing performance caused by the too high conductivity of titanium carbide.

The invention relates to high-flame-retardant polypropylene resin for a new energy automobile and a preparation method of the high-flame-retardant polypropylene resin, and belongs to the technical field of high polymer materials. The high-flame-retardant polypropylene resin is prepared from the following raw materials: polypropylene, maleic anhydride grafted polypropylene, POE grafted acrylic acid, LLDPE grafted maleic anhydride, Si-APP (at) BN, a bio-based phytic acid metal chelate, nano titanium carbide, a TPC polyester elastomer, nano cerium oxide and silicone powder. Si-APP (at) BN is an organic silicon modified ammonium polyphosphate (at) boron nitride core-shell structure material obtained by coating the surface of nano boron nitride with Al2O3, then polymerizing ammonium polyphosphate and grafting vinyl trimethoxy silane. The POE grafted acrylic acid, the LLDPE grafted maleic anhydride, the Si-APP coated BN, the bio-based phytic acid metal chelate, the TPC polyester elastomer and other components have a synergistic effect, a heat conduction-flame retardant network is constructed, and the bottleneck of the prior art is broken through through molecular structure design and process innovation.

Various examples are provided related to ultrathin polymer-derived ultra-high temperature ceramic (UHTC). In one example, a ceramic coating includes a polymer-derived ceramic (PDC); an UHTC; and a ceramic adhesive comprising alumina (Al2O3). For example, the PDC can include silicon carbide and the UHTC can include a titanium carbide. A thickness of the ceramic coating can be less than 1 mm. In another example, a method includes providing the ceramic coating and applying the ceramic coating to a surface of a structure. For example, the structure can be an aircraft, a ship, a missile, or a rocket.