128 results about "Titanium diboride" patented technology

The invention provides a preparation method of prismatic titanium diboride powder, and belongs to the technical field of titanium diboride powder. The preparation method comprises the steps of titanium source preparation, boron source preparation, material mixing, cold isostatic pressing and carbon thermal reduction reaction. The step of preparing the titanium source comprises the following steps: heating TiO2 powder body liquid, raising the temperature to 52-55 DEG C, adding a tetrabutyl titanate solution, uniformly stirring, adding an ammonia water solution to adjust the pH value to 7.0, and carrying out heat preservation stirring for 2.7-3.2 hours to obtain the titanium source; the step of preparing the boron source comprises the following steps: adding B4C powder into absolute ethyl alcohol, carrying out ultrasonic dispersion, then adding a mixed solution, controlling the adding rate of the mixed solution to be 0.8-1.2 g / min, heating to 34-37 DEG C, and carrying out heat preservation and stirring for 3.8-4.2 hours to obtain the boron source; the titanium diboride powder obtained through the method is in a prism shape and is uniform in particle, high in density and purity and poor in high-temperature oxidation resistance.

The present invention provides a titanium diboride particle-reinforced heat-resistant aluminum alloy powder for electron beam additive manufacturing. The chemical composition of the aluminum alloy powder includes, by mass percentage, Cu: 1.8-2.7%, Ni: 0.8-1.4%, Mg: 0-1.8%, Fe: 0.1-1.4%, TiB2 particles 0.1-10%, and the balance is aluminum. The main steps of its preparation method are: melting of the particle-reinforced aluminum alloy preform ingot and gas atomization forming of the particle-reinforced aluminum alloy powder. The block formed by electron beam additive manufacturing using the titanium diboride particle-reinforced heat-resistant aluminum alloy powder of the present invention has no cracks, and the microstructure is uniform and the grains are fine. After heat treatment, the obtained tensile strength is 320 MPa, and the elongation is greater than 10%, which is better than the average level of the mechanical properties of electron beam additive manufacturing aluminum alloys.

The invention relates to the technical field of aluminum alloy pipes, in particular to a corrosion-resistant aluminum alloy pipe which comprises an aluminum alloy pipe and a corrosion-resistant layer coated on the surface of the aluminum alloy pipe, the aluminum alloy pipe comprises the following raw materials: 0.1-0.3% of Mg, 0.06-0.2% of Si, 0.1-0.5% of Fe, 0.005% of Cu, 0.2-0.5% of Mn, less than 0.1% of Cr, 0.1-0.4% of Zn, 0.05-0.2% of Ti, 0.01-0.05% of V and the balance of Al; the corrosion-resistant layer comprises the following components in parts by weight: 100 parts of epoxy resin emulsion, 15-25 parts of composite modified titanium diboride, 3-5 parts of an amino curing agent, 1-3 parts of carbon fibers, 20-30 parts of deionized water, 2-3 parts of a dispersing agent and 0.3-0.5 part of a defoaming agent. According to the technical scheme, the overall corrosion resistance and impact resistance of the aluminum alloy pipe are remarkably 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).

The invention relates to the technical field of ceramic materials, and provides a high-strength multilayer ceramic substrate and a preparation method thereof. The high-strength multilayer ceramic substrate comprises the following raw materials in parts by weight: 70-90 parts of aluminum oxide, 1-3 parts of a dispersant, 4-8 parts of a binder, 1-3 parts of a plasticizer, 10-15 parts of an auxiliary agent and 60-70 parts of water, the auxiliaries are oxides of titanium diboride, magnesium fluoride and cerium; the mass ratio of the oxides of the titanium diboride, the magnesium fluoride and the cerium is 1: 3: (1-5). According to the technical scheme, the problem of low strength of the multilayer ceramic substrate in the prior art is solved.

The invention belongs to the technical field of aero-engine materials, and particularly relates to a high-temperature-resistant aero-engine blade and a preparation method thereof.According to the blade, titanium-aluminum alloy is adopted as a base body, and two novel materials including a core-shell structure self-healing reinforcement phase and a rare earth niobate ferroelastic protection compound are introduced, so that the high-temperature-resistant aero-engine blade is obtained; and the comprehensive performance of the blade in a high-temperature environment is remarkably improved. The core-shell reinforcement phase takes titanium diboride as a core and boron nitride as a shell, and can realize a self-healing function at a high temperature; the rare earth niobate compound has ferroelastic behavior and ultralow thermal conductivity through doping modification of tantalum and rhenium. The preparation process comprises the following steps: mixing the titanium-aluminum alloy powder, the reinforcing phase, the silicon carbide short fibers and the binder, carrying out spark plasma sintering molding, carrying out machining, applying the protective coating through plasma spraying, and finally carrying out heat treatment. According to the method, the process is simplified, and the prepared blade has excellent high-temperature resistance, oxidation resistance and mechanical property and is suitable for aero-engine hot end components.

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 provides high-purity superfine titanium diboride and a preparation method thereof, and relates to the field of titanium diboride preparation. The method comprises the following steps: mixing boron oxide, titanium hydride, a carbon source, nano rare earth oxide and an organic solvent, and drying to obtain a mixture; in a vacuum environment, performing first roasting on the mixture to obtain a first roasted material; and in an oxygen-containing atmosphere, carrying out second roasting on the first roasting material to obtain the high-purity superfine titanium diboride. In the first roasting process, boron oxide, titanium hydride and a carbon source are completely melted and fully contacted, then further, the carbon source forms a carbon skeleton, the contact area between the melted boron oxide and titanium hydride and the carbon skeleton is further enlarged, liquid-liquid mixing and the increase of the contact area can reduce the reaction kinetic conditions, the reaction temperature is greatly reduced, and the reaction time is greatly shortened. The particle size of the generated titanium diboride is reduced, and the molten boron oxide and titanium hydride react on the porous carbon skeleton in a liquid-liquid form to generate the high-purity superfine titanium diboride.

The invention relates to the technical field of material surface engineering and metallurgical equipment, in particular to a composite coating for prolonging the service life of a crystallizer copper plate and a plasma spraying preparation method thereof.The composite coating comprises, by mass, 35%-55% of chromium, 20%-55% of nickel, 5%-10% of titanium diboride, 0.1%-0.3% of niobium and the balance chromium carbide and inevitable trace impurity elements. According to the invention, titanium diboride and chromium carbide are used as main hard reinforcing phases, so that the coating shows excellent wear resistance at normal temperature and high temperature; a hollow graphite electrode is adopted in the spraying process, plasma arc is generated, and meanwhile an ablation product (carbon) provides a carbon source for formation of chromium carbide; the titanium powder and the boron powder are subjected to an in-situ reaction in a plasma arc to generate titanium diboride, and the in-situ synthesis technology enables hard phase particles to be fine and uniformly distributed, and forms a firm interface with a metal binding phase, so that the problems of interface pollution and weak combination caused by the addition of the hard phase are avoided.

This invention discloses a coating for sand casting of aluminum-lithium alloys and its preparation method. The coating comprises a surface layer in contact with the sand mold and a top layer in contact with the melt. The surface layer material is an alcohol-based zirconium oxide coating containing graphene, and the top layer coating is an alcohol-based boride coating containing titanium diboride and zirconium diboride. This invention effectively improves the coating density and heat transfer rate by doping graphene with metal boride nanoparticles. Using graphene, ceramic materials, and metal borides as aggregates and dopants effectively suppresses the burn-off of light elements such as Li, reducing subcutaneous pinholes and porosity defects in the casting. Using zirconium oxide powder as aggregate increases nucleation sites, effectively improving the quality of non-ferrous metal castings.

The invention provides a prismatic titanium diboride reinforced boron nitride-based conductive ceramic evaporation boat and a preparation method thereof, and belongs to the technical field of ceramic evaporation boats. The step of preparing the boron nitride matrix comprises the following steps: adding boron nitride powder into a nitric acid solution to obtain pretreated boron nitride powder; adding the pretreated boron nitride powder into absolute ethyl alcohol, adding tetrabutyl titanate and deionized water, adjusting the pH value to 4.0-4.3, stirring for 1.2-1.5 hours at the temperature of 30-32 DEG C, drying and calcining to obtain a boron nitride matrix; the prepared conductive ceramic evaporation boat is low in resistivity, high in strength, excellent in corrosion resistance and good in comprehensive performance.

The utility model relates to the technical field of titanium diboride powder processing, in particular to an efficient titanium diboride powder purifying device which comprises a tank body and an auxiliary device, a cover body is arranged above the tank body, a centrifugal motor is fixedly connected to the lower surface of the tank body, a centrifugal barrel is installed at the output end of the centrifugal motor, and a liquid discharging pipe is arranged below the tank body. The auxiliary device is arranged on the surface of the cover body and comprises a support, the support is fixedly connected with the surface of the cover body, a sliding hole is formed in the surface of the support, a moving rod is slidably connected to the inner wall of the sliding hole, a scraping strip is fixedly connected to the surface of one side of the moving rod, the moving rod and the scraping strip penetrate through the cover body, and a driving assembly is arranged on the surface of the support. By arranging the auxiliary device, auxiliary equipment can be conveniently used, it can be ensured that materials are more thoroughly separated from the barrel wall of the centrifugal part, blocking is reduced, the efficiency and effect of the centrifugal process are improved, meanwhile, the centrifugal part can be conveniently cleaned, labor burden is reduced, and usability is improved.

The invention discloses a four-phase composite ceramic heating element and a preparation method thereof, and relates to the technical field of ceramic heating materials, the composite ceramic heating element comprises the following components: 30%-40% of titanium diboride, 30%-40% of titanium carbide, 10%-28% of silicon carbide, 1%-12% of hexagonal boron nitride, 0.5%-3% of nano zirconium dioxide and 1%-4% of silicon nitride. A four-phase composite system of TiB2 (titanium diboride), TiC (titanium carbide), SiC (silicon carbide) and hBN (hexagonal boron nitride) is constructed, basic expansion reduction is achieved through the low expansion characteristic of SiC, thermal expansion mismatching stress between different phases is dispersed in combination with the interface regulation and control effect of an h-BN layered structure, compared with an existing ternary system, the minimum thermal expansion coefficient is reduced to 5.8 * 10 <-6 > K <-1 >, and the thermal expansion coefficient is reduced to 5.8 * 10 <-6 > K <-1 >. And the interfacial compatibility is remarkably improved, and thermal stress is prevented from being gathered at the interface.

The invention relates to the field of refractory materials, in particular to a high-strength refractory material and a preparation method thereof, which are used for solving the problem that the existing traditional refractory material is low in strength and difficult to meet the high-standard requirement of modern industry on equipment. The high-strength refractory material comprises the following components: silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and a phosphorus-containing phenyl multi-epoxy-group binding agent, according to the preparation method, silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide and titanium diboride are taken as main raw materials, the main raw materials are endowed with excellent mechanical properties, and after a phosphorus-containing phenyl polyepoxy binding agent is added, the mechanical properties of the main raw materials can be further remarkably improved, so that the prepared refractory material has the characteristics of high strength, high temperature resistance and the like. The composite material shows high durability and reliability in a high-temperature environment, and is suitable for thermal protection in the high-temperature environment and internal construction of high-temperature equipment.

The application belongs to the technical field of refractory materials, and particularly relates to high-strength anti-stripping industrial kiln castable and a preparation method thereof. The industrial kiln castable provided by the application comprises white corundum, modified corundum, petalite, composite micropowder, modified micropowder, a binder and sodium hexametaphosphate. The white corundum, the modified corundum and the petalite are used as aggregates of the kiln castable, the composite micropowder and the nano micropowder are added to fill the aggregate gaps, and the porosity of the castable is reduced. The titanium dioxide is used to dope the corundum to form a solid solution, and a silica ceramic layer is coated on the surface of the nano titanium diboride by using a sol-gel method, so that the interface bonding force between the nano titanium diboride and the matrix is strengthened, the rigid reinforcing points are increased, and the high-temperature compressive strength is improved.

The invention relates to the technical field of metal-based composite materials, in particular to a preparation method of a titanium-based composite material with a bimodal non-uniform net structure. The invention provides a preparation method of a titanium-based composite material with a bimodal non-uniform net structure, which comprises the following steps: mixing titanium alloy metal powder as a base material with nano titanium diboride, lanthanum hexaboride and a silicon powder reinforcement material through high-energy ball milling to obtain composite powder; a field-assisted sintering technology (FHP) is utilized, and a non-continuous reinforced titanium-based composite material (DRTiMCs) sintered blank is obtained; and carrying out heat preservation in a vacuum heat treatment furnace, and then carrying out a hot rolling experiment to obtain the DRTiMCs with the bimodal non-uniform network structure. The bimodal non-uniform net structure is composed of micron TiBw, nano TiBw, nano La2O3 and nano silicide, DRTiMCs of the bimodal non-uniform net structure have excellent strength and ductility, the tensile strength reaches 1544 MPa and 1560 MPa, and the percentage elongation after fracture is 7.7% and 10.2%. The DRTiMCs provide a good working idea for further development and engineering application of the composite material in the fields of aviation and aerospace.

The application relates to a preparation method of a titanium diboride reinforced Ni60AA alloy coating on the surface of a continuous casting crystallizer copper plate, and belongs to the technical field of laser cladding. The method comprises the following steps: S1, pretreatment of the surface of a substrate; S2, preheating of the substrate; S3, preparation of a nickel-based cladding layer on the surface of the copper plate as a transition layer; S4, preparation of a reinforced deposition layer on the surface of the nickel-based transition layer; and S5, machining of the cladded workpiece to the required precision and size under working conditions. According to the application requirements of the application of the crystallizer copper plate under the challenges of high temperature, high wear and thermal cracking resistance, a functional gradient coating of titanium diboride reinforced Ni60AA composite material is designed. The coating realizes the gradual enhancement of the material performance from the substrate to the surface layer by regulating the laser directional energy deposition of the titanium diboride and nickel-based composite powder on the surface of the copper plate, so that the hardness, wear resistance and thermal cracking resistance of the deposition layer are significantly improved.

The present invention relates to the field of electric water heaters, and in particular to a household multifunctional water-boiling device, including an outer shell and an inner tank, etc. In the household multifunctional water-boiling device of the present invention, in different water-boiling modes, a first heating tube and a second heating tube respectively perform water heating treatment in different states in the inner tank and the sleeve, respectively meeting the water-boiling requirements of obtaining a large amount of hot water and the water-boiling requirements of obtaining hot water quickly, and can directly clean and maintain the inner cavity of the sleeve. The first heating tube and the second heating tube, as heating components for water-boiling, use an insulating substrate layer as a substrate, a titanium diboride semiconductor coating layer is combined on the insulating substrate layer, and then an anti-oxidation and insulating protective film layer is combined outside the titanium diboride semiconductor coating layer, so that while meeting the safe and rapid water-boiling heating effect, it also has the characteristics of less scaling and easy maintenance.

The present invention belongs to the technical field of coatings, and particularly relates to a one-coat material for engine bottom and its preparation method. The coating material uses polyaspartate resin, introduces a rigid polysulfone chain segment to restrict the excessive movement of the flexible chain segment of the resin and improve the crosslinking density of the polymer, thereby enhancing the intermolecular force, improving the efficiency of molecular chain transfer and dissipation of energy, and further improving the impact resistance of the material; introduces a hydrophobic polymethacrylate chain segment to endow the coating with good water resistance; fills with nano titanium diboride to improve the wear resistance and corrosion resistance of the coating. The coating prepared by the present invention is a low-VOC one-coat material, which not only has good adhesion of the primer and can firmly adhere to the surface of the substrate, but also has the properties such as water resistance and corrosion resistance of the topcoat; at the same time, it reduces the emission of VOCs, helps to reduce air pollution, and meets the requirements of environmental protection policies.

The invention provides an aluminum-silicon alloy flux purification and titanium removal process, and belongs to the technical field of alloy refining and purification. According to the method, a two-time flux injection method is adopted, firstly, boron-containing molten salt is added in a first flux injection mode, the yield of the boron element is increased, the boron element is promoted to react with a titanium-containing phase, and the boronizing reaction is fully completed; and secondly, the second flux is blown to adsorb titanium diboride particles generated in the reaction, and the flux adsorbing impurities floats upwards to enter a slag layer and is removed in the subsequent slagging-off operation. Through specific chemical reaction and physical separation means, the titanium element in the aluminum-silicon alloy melt can be effectively removed, and the titanium content is reduced to an ideal range. The technology has the advantages of being easy and convenient to operate, environmentally friendly, capable of saving energy and the like, and a new technical means is provided for purification of the aluminum-silicon alloy.

The invention relates to the technical field of wave-absorbing materials, and provides a preparation method of a manganese-zinc wave-absorbing ferrite material and a corresponding material.The preparation method comprises the steps that initial powder is prepared through a gel curing method, the initial powder is pre-calcined to prepare pre-calcined powder, the pre-calcined powder is subjected to reinforced granulation and then pressed and sintered, and the manganese-zinc wave-absorbing ferrite material is prepared. According to the preparation method of the manganese-zinc wave-absorbing ferrite material and the corresponding material, the electromagnetic wave absorption performance can be optimized by selecting materials such as iron phosphate, spherical nickel carbonyl, titanium diboride, dysprosium nitrate, di-iso-octyl phosphate, molybdenum disulfide and ammonium polyacrylate and adopting a warm-pressing molding and gradient heating sintering process; the magnetic performance, the electric and thermal conductivity, the sintering compactness and the high-temperature wave-absorbing performance of the material are improved, and meanwhile the problems of deformation and cracking in the sintering process are solved.

The invention provides an alloy composite material for an automobile armrest, a preparation process and the automobile armrest, and belongs to the field of automobile armrest materials. The preparation process comprises the following steps: preparing mesoporous carbon; preparing a mesoporous carbon loaded nano titanium diboride composite material; preparing a heat insulation additive; preparing an anti-ultraviolet additive; preparing an anti-ultraviolet heat insulation shell material; and preparing the automobile armrest composite material. The preparation method comprises the following steps: preparing a phenolic resin prepolymer solution from phenol and formaldehyde as raw materials, adding the phenolic resin prepolymer solution into a mixed solution containing a triblock copolymer P123 for aging, carrying out heating carbonization and post-treatment to prepare mesoporous carbon, adding the mesoporous carbon into a precursor solution prepared by mixing a butyl titanate solution and a boric acid solution, and carrying out a hydrothermal reaction to obtain the mesoporous carbon / titanium dioxide composite material. After the mesoporous carbon loaded nano titanium diboride composite material is added into an alloy base material, the strength of the alloy base material can be effectively improved, and then the overall mechanical property of the composite material is improved.

This invention relates to the fields of materials surface engineering and metallurgical equipment technology. Specifically, it relates to a composite coating for improving the lifespan of copper plates in crystallizers and its plasma spraying preparation method. The chemical composition, by mass percentage, includes: 35%-55% chromium, 20%-55% nickel, 5%-10% titanium diboride, 0.1%-0.3% niobium, with the balance being chromium carbide and unavoidable trace impurities. In this invention, titanium diboride and chromium carbide are used as the main hard reinforcing phases, enabling the coating to exhibit excellent wear resistance at both room temperature and high temperature. During the spraying process, a hollow graphite electrode is used, generating a plasma arc. Simultaneously, the ablation products (carbon) provide a carbon source for the formation of chromium carbide. Titanium powder and boron powder undergo an in-situ reaction in the plasma arc to generate titanium diboride. This in-situ synthesis technology results in fine and uniformly distributed hard phase particles, forming a strong interface with the metal binder phase, avoiding the problems of interface contamination and weak bonding caused by externally added hard phases.

The present invention provides an organic-inorganic hybrid battery separator, a preparation method thereof and an aqueous zinc ion battery, comprising boron-containing inorganic particles and an organic polymer; the boron-containing inorganic particles include one or more of boron nitride, boron carbide, aluminum diboride and titanium diboride; the mass ratio of the boron-containing inorganic particles to the organic polymer is 1: (3~15). The present invention forms a composite film of boron-containing inorganic particles and organic polymers, thereby avoiding the blockage of the pores of the base separator by the dense inorganic coating and also avoiding the shedding behavior of the surface coating during the battery cycle. At the same time, the boron-containing inorganic particles in the present invention provide good heat resistance and mechanical properties, optimize the structure of the polymer, regulate the zinc deposition behavior during the cycle, effectively improve the ionic conductivity of the separator, and enhance the electrochemical performance of the aqueous zinc ion battery.

The invention belongs to the technical field of coatings, and particularly relates to a primer-topcoat coating material for an engine and a preparation method of the primer-topcoat coating material. According to the coating material, polyaspartic acid ester resin is adopted, a rigid polysulfone chain segment is introduced, excessive movement of a flexible chain segment of the resin is limited, and the crosslinking density of a polymer is improved, so that the intermolecular acting force is enhanced, the efficiency of molecular chain transfer and energy dissipation is improved, and the impact resistance of the material is further improved; a hydrophobic polymethacrylate chain segment is introduced, so that the paint is endowed with good water resistance; the nano titanium diboride is filled, so that the wear resistance and the corrosion resistance of the coating are improved. The coating prepared by the invention is a primer-topcoat low-VOC coating, has good adhesive force of a primer, can be firmly attached to the surface of a base layer, and also has water resistance, corrosion resistance and other properties of a topcoat; meanwhile, emission of VOC is reduced, air pollution can be reduced, and the requirements of environmental protection policies are met.

The present application discloses a biodegradable composite lubricant, which relates to the technical field of lubricants. The raw materials of each component include by weight: 5 parts of modified wear-resistant material, 2 parts of multilayer graphene, 3.5 parts of additives, 12 parts of phosphoric acid, 17 parts of n-octadecyl alcohol, 35 parts of vegetable oil, 2.5 parts of oleic acid surfactant, 2 parts of antioxidant, 2.5 parts of extreme pressure agent, 1.5 parts of defoaming agent, 5 parts of viscosity regulator, and 18 parts of water; the modified wear-resistant material is an oil-soluble microsphere, which is made of silica-coated filler and has two layers, the inner filler includes silicon nitride and titanium diboride, and the mass ratio of silicon nitride to titanium diboride is 1:2; the outer layer is tetraethyl orthosilicate, and the porogens used in the inner and outer layers are different; the present invention stores more lubricating oil through a large pore structure, so that lubrication can be continuously provided during the friction process, and the lubricating effect and durability of the lubricating oil are further enhanced through the design of double-layer silica loading.

The invention provides a positive electrode material and a preparation method thereof, an electrochemical device and electronic equipment, and particularly relates to the technical field of battery materials. The positive electrode material comprises a substrate and a coating layer, the substrate is a nickel-based layered oxide, and in the nickel-based layered oxide, the molar content of nickel is not less than 80% on the basis of the total amount of metal except lithium; the surface of the base body is coated with the coating layer, and the coating layer is a titanium diboride layer. The nickel-based layered oxide material is subjected to surface coating through titanium diboride, so that direct contact between an active material and an electrolyte can be reduced, generation of an interface side reaction is inhibited, and the cycle life of the battery is effectively prolonged; extraction of extra lithium elements from the interior of the matrix material can be avoided, the problem of low capacity caused by unbalance of stoichiometric ratio of lithium in the material is prevented, and the performance of the subsequent ternary positive electrode material is ensured to be fully exerted.

The invention relates to the technical field of heating wire production, and discloses a production process for increasing the resistance of a heating wire and shortening a heating joint, the heating wire material is nickel-chromium alloy or iron-chromium-aluminum alloy, and the heating wire material comprises the following components: 60-80% by weight of iron matrix element; the weight percentage of the chromium element is 20%-30%; the weight percentage of the rare earth element is 0.2%-0.5%; the weight percentage of the aluminum element is 4%-8%; the balance is other inevitable impurities. The technical scheme that rare earth elements (cerium and yttrium) and grain refiners (titanium diboride and aluminum oxide) are introduced to optimize the material formula is adopted, the grain boundary stability and the grain refinement effect of the alloy are improved, the resistance performance and the oxidation resistance of the heating wire in the high-temperature environment are improved, and compared with a traditional scheme in which the alloy formula is not optimized in the prior art, the resistance performance and the oxidation resistance of the heating wire are improved.

The application discloses a kind of powder preparation devices of titanium diboride for lithium battery preparation, including preparation container, controller, gas pressure gauge and servo motor, the output end of the servo motor passes through preparation container and is fixedly connected with ball screw nut pair, kettle wall contact component is arranged outside the ball screw nut pair, specifically relates to titanium diboride powder preparation technical field, the dispersion component rotation is realized when screw shaft axial rotation and is driven to realize the dispersion stirring operation of kettle body bottom material, the preparation rate of material can be promoted by dispersion component rotation and drives material stirring, and the purpose of kettle body wall scanning and dispersion component dispersion material can be completed under the premise that only one servo motor works, so that the purpose of promoting material preparation rate and reducing material loss can be simultaneously realized in energy-saving environment, effectively realize the purpose of reducing cost and improving yield and product quality.

The invention relates to the technical field of electromagnetic shielding materials, in particular to light boron carbide / titanium diboride-based composite ceramic with high-temperature electromagnetic shielding and load bearing functions and a preparation method thereof. The composite ceramic takes B4C and a single-phase (TixM1-x) B2 solid solution as main components, M is any one of Cr, Mo, Ni, Zr, Mn, W, Ta, Hf, V, Nb and Sc, and x is more than or equal to 0.5 and less than or equal to 1. The multifunctional ceramic material with light weight, excellent electromagnetic shielding and mechanical properties and high-temperature electromagnetic shielding and load bearing functions can be obtained only by adjusting the content, the element types and the proportion of the titanium diboride-based solid solution in the composite ceramic, and the leading mechanism (absorption leading or reflection leading) of the electromagnetic shielding of the multifunctional ceramic material can be regulated and controlled.