125 results about "Titanium boride" 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 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 high-thermal-conductivity BN-based TiB2 composite conductive ceramic is prepared from the following materials in percentage by mass: 57-85% of boron nitride, 12-38% of titanium boride and 3-5% of an interface modifier, and the preparation method of the high-thermal-conductivity BN-based TiB2 composite conductive ceramic comprises the steps of dry mixing, forming and hot pressed sintering. Through collaborative optimization of the components and the process, the triple characteristics of high heat conduction, controllable electric conduction and ultrahigh thermal shock resistance are achieved, BN serves as a main phase, the content of TiB is optimized to ensure the connectivity of a conductive network, the thermal shock resistance is improved through the high heat conduction and low thermal expansion characteristics of BN, and the thermal shock resistance delta T is larger than or equal to 1000 DEG C; the dry mixing process controls TiB particles to be distributed in gaps of BN lamellas, a three-dimensional conductive network is formed, TiB is directionally distributed, solvent pollution is avoided, the anisotropic structure of BN is reserved, the heat conductivity is improved, the volume resistivity is adjustable, the requirements of different scenes are met through the TiB content gradient design, and the application field is expanded.

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 discloses an extrusion-molded magnesium oxide tube and a processing technology thereof, and relates to the technical field of functional ceramics, and the processing technology comprises the following steps: mixing magnesium oxide and inorganic auxiliary materials, and carrying out ball milling; adding a binder, carrying out extrusion molding, and sintering to obtain a magnesium oxide tube; the inorganic auxiliary material is a mixture of aluminum oxide and titanium boride in a mass ratio of (0.5-3.0): 1. According to the invention, by adding the inorganic auxiliary material, alumina and magnesium oxide are subjected to a solid-phase reaction to generate a magnesium aluminate spinel phase, so that the thermal shock resistance, high temperature resistance and thermal conductivity of a sintered product are improved. Introduced titanium boride can react with gas volatile matter generated by sintering of the binder, and cooperates with a sintered product of the binder to form three-dimensional ceramic among magnesium oxide particles, so that the hardness, high temperature resistance and stability of the sintered product are improved, and the heat transfer efficiency of the sintered product is improved.

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.

The invention discloses a novel antibacterial environment-friendly ceramic and a preparation method thereof, and belongs to the technical field of ceramics, the method comprises the following steps: dissolving aluminum chloride, barium nitrate and ferric nitrate in a solvent, and stirring and mixing to prepare a first mixed solution; adding kaolin and carbon powder into the first mixed solution, and stirring and mixing to obtain a second mixed solution; boron, carbon, aluminum, boron oxide, zirconium dioxide and barium carbonate are dispersed in a dispersing agent to be mixed to prepare a third mixed solution; boron oxide, aluminum hydroxide, titanium boride, zirconium, silicon, sodium zirconate, sodium carbonate, calcium tungstate and zirconium dioxide are added into the second mixed solution to be stirred and mixed, and mixed slurry is prepared; the mixed slurry is used for preparing a blank body, the blank body is placed in a sintering furnace to be sintered in different temperature stages and sintering environments, and the prepared ceramic has high strength, is not prone to cracks in the environment where the temperature changes rapidly and is good in corrosion resistance.

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 application relates to the technical field of ceramic materials, in particular to a boron carbide composite ceramic material and a preparation method and an etching component thereof. The preparation method comprises the following steps: forming granular materials containing boron carbide, titanium boride and silicon carbide, the granular materials have a spherical structure, the mass proportion of the boron carbide in the granular materials is 70%-90%, the mass proportion of the titanium boride is 5%-25%, and the mass proportion of the silicon carbide is 5%-25%; and the granular materials are sequentially subjected to pre-sintering and hot-press sintering to prepare the boron carbide composite ceramic material; wherein the temperature of the pre-sintering is 1200 DEG C-1500 DEG C. The application can promote the three-dimensional communication growth of sintering necks in the hot-press sintering process, effectively improve the material density, ensure the good uniformity of the material, and synergistically improve the etching resistance of the boron carbide ceramic material.

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 present invention provides an aluminum alloy for automobile pistons and a preparation method thereof, the preparation method being as follows: using aluminum ingots and crystalline silicon as raw materials to make a binary master alloy; adding magnesium ingots, Al-Cu alloy ingots and Al-Mn alloy ingots to perform a multi-element alloying process; refining the alloy material after melting and standing; adding enhanced-modified particles to stir and keep warm; refining for a second time, while starting a pulse device to apply a pulse current to the alloy melt to keep warm; cooling to 800°C and pouring into a mold; after the sample solidifies and cools, heat treatment is performed using a T6 heat treatment process. The present invention uses enhanced-modified particles to simultaneously possess mechanical enhancement and modification effects. Simply using nano-titanium boride will result in uneven distribution in the aluminum alloy, and nano-scale particles are prone to agglomeration, thereby affecting its effect. Particles prepared by electrostatic spinning can prevent the agglomeration of particles while loading the P element. In addition, enhanced-modified particles can also improve the plasticity of the aluminum alloy, an effect that cannot be achieved by simple nanoparticles.

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 invention relates to the technical field of semiconductor lead frames, in particular to a high-stability semiconductor lead frame and a preparation method thereof.The preparation method comprises the following steps that 1, copper, nickel, silicon, chromium, phosphorus and modified titanium boride are subjected to ball milling together to obtain mixed powder; 2, the mixed powder is put into a mold for cold press molding, and a green body is obtained; 3, the green body is subjected to sintering treatment and solution treatment, and a composite block is obtained; 4, cold-rolling the composite block into a strip, and performing aging treatment to obtain a composite material; step 5, performing punch forming on the composite material to obtain a semi-finished product of the high-stability semiconductor lead frame; 6, carrying out alkali washing on the semi-finished product, then putting the semi-finished product into a hydrochloric acid solution for derusting, and finally carrying out acid pickling activation to obtain an activated semi-finished product of the high-stability semiconductor lead frame; and 7, putting the activated semi-finished lead frame product into a chemical plating solution composed of nickel, tungsten, phosphorus and a graphene composite material for electroplating, and then drying to obtain the finished high-stability semiconductor lead frame.

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 relates to the technical field of self-lubricating fabric liner materials, in particular to a composite filler synergistically-enhanced high-temperature-resistant self-lubricating fabric liner composite material and a preparation method thereof. The invention provides a self-lubricating fabric liner composite material. The self-lubricating fabric liner composite material comprises a polyimide fabric and a polyimide resin composite material compounded in the polyimide fabric, the polyimide resin composite material comprises polyimide resin and a composite reinforcing material dispersed in the polyimide resin; the composite reinforcing material comprises boron nitride and titanium boride. The self-lubricating fabric liner composite material can bear the operation requirement of 400 DEG C high-temperature working conditions.

The application belongs to the field of ceramic materials, and particularly relates to a preparation method of a porous titanium boride alloy / hydroxyapatite fluoride composite material. 10 (PO4)6OH 2‑2x F 2x Wherein, x is 0.1-0.6; in the mixture, the weight ratio of TC4, TiB2 and FHA is 86-94:3-7:3-7; the sintering temperature is 1000-1100 DEG C. The application also includes the composite material prepared by the preparation method and the application of the composite material in oral implant materials. The preparation method can realize synergy, improve the strength and biological activity of the material based on the combination of components, proportions and sintering processes.

A composition, a machine component coated with the same, and a method of coating the machine component are provided. The composition includes a CoNiCrAlY alloy, where three or more elements of the CoNiCrAlY alloy are present in equimolar amounts, one of the three or more elements of the CoNiCrAlY alloy being aluminum (Al), and where a molar fraction of Al is between about 0.20 and about 0.25. The composition further includes a transition metal boride including at least one of: cobalt boride (Co2B), titanium boride (TiB2), zirconium boride (ZrB2), tantalum boride (TaB2), niobium boride (NiB2), or molybdenum boride (Mo2B), and a refractory alloy.

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 application discloses a ceramic roller rod and a preparation method thereof, and relates to the technical field of ceramic matrix composites.The ceramic roller rod comprises a core layer, a transition layer and a surface layer;the layered gradient structure of the core layer, the transition layer and the surface layer is designed, alumina-zirconia, alumina-mullite and silicon nitride-titanium boride composite ceramic matrices are selected for each layer, and special matrix-reinforcing phase combinations are formed by matching nano silicon carbide particles, boron nitride particles and graphene microsheets;meanwhile, a pretreatment process of separately ball-milling and screening raw materials of each layer is adopted, thus solving the problems of the existing roller rod, such as single matrix matching conventional reinforcing phase, no functional doping ratio and easy agglomeration of overall mixed raw materials, so that the matrix and the reinforcing phase of each layer form material synergy, and the different functional requirements of the core bearing, the intermediate layer connection and the outer surface wear resistance and high temperature resistance are met respectively, and precise adaptation of material performance and functions of each part of the roller rod is realized.

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 application discloses a kind of biomimetic laminated ballistic ceramic material, including matrix layer and embedded layer composition, it is matrix layer, embedded layer, matrix layer in turn by outside inside alternately stacked composition, wherein matrix layer is by B4C powder, SiC powder, nano additive, binder and plasticizer are made, embedded layer is Al2O3 powder, MgO or titanium boride at least one, hexagonal boron nitride powder, binder and plasticizer are made.The biomimetic laminated ballistic ceramic of the application has the advantages of light weight, high hardness, high toughness, good effect of anti-intensive attack, etc.Cutting after the ceramic sample is handled, and the target sample piece with the face density of about 27.5kg / m 2 The target sample piece is prepared by compounding with ultra-high molecular weight polyethylene fiber plate, 95 type 5.8mm ordinary bullet is carried out, and multiple bullet shooting can be effectively defended, and the highest can be continuously defended 8 bullet shooting, and the application is suitable for the protection demand of various light armored equipment and individual protection equipment to small caliber bullet, and the survival rate in battlefield is improved.

The invention discloses an electric-corrosion-resistant tungsten alloy contact material. The electric-corrosion-resistant tungsten alloy contact material comprises tungsten powder, copper powder and an additive, wherein the substance mass ratio of the tungsten powder to the copper powder to the additive is (93-97): (4.9-2.1): (2.1-0.9). The tungsten alloy contact material is prepared by blending tungsten powder, copper powder and an additive, meanwhile, scandium-cerium continuous effect liquid in the additive and a titanium boride agent are subjected to stirring improvement treatment, and carbon nanotubes, zirconium oxide, a silane coupling agent KH550 and a dopamine hydrochloride solution in the continuous effect liquid are blended and matched; according to the titanium boride agent obtained by blending titanium boride with samarium chloride and graphene, through synergistic improvement and co-coordination of the raw materials, the obtained additive optimizes the ablation resistance, strength performance and hardness coordination of the product in a system, and the temperature change resistance stability effect of the product is remarkable.

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 provides a high-pressure-corrosion-resistant hard alloy material and a preparation method and application thereof, and belongs to the technical field of alloy materials. The strength, toughness and corrosion resistance of the material are improved by constructing a hard phase of titanium boride, silicon carbide and chromium diboride, high-temperature compact coating is achieved by introducing a multi-phase composite binder composed of an aluminum iron alloy, a high-entropy alloy and cerium hexaboride, and the asymmetric gradient paving and sintering technology is adopted for cooperation; a gradient structure with the surface layer high in hardness, the core high in toughness and the transition layer capable of relieving stress concentration is constructed, meanwhile, the surface hardness and sealing performance are strengthened through powder burying and calcination, and the abrasion resistance, corrosion resistance and impact resistance of the material are comprehensively improved.

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.

The invention relates to a carbon-free refractory material which comprises the following raw materials in percentage by weight: 55-65% of high-purity fused magnesia particles, 5-10% of high-purity fused magnesia fine powder, 15-25% of pre-synthesized magnesium aluminate spinel fine powder, 4-6% of zirconium oxide, 3-5% of magnesium phosphate colloid, 1-3% of stable zirconium oxide fiber, 0.5-1.0% of lithium silicate, 0.5-1.0% of rare earth oxide, 0.1-0.5% of titanium boride and 0.2-0.5% of ammonium polyacrylate. The preparation method comprises the following steps: pretreating raw materials; dry mixing; wet mixing; performing final mixing; isostatic pressing molding; performing drying; sintering is performed; and naturally cooling to room temperature for later use. According to the invention, the carbon content is not more than 0.2%, the normal-temperature compressive strength is 76-115 MPa, the thermal conductivity is not more than 2.5 W / mK, and no peeling phenomenon is generated when the number of thermal shock cycles reaches 30; and the erosion depth / width of the steel slag is 0.6 / 1.5 mm.

To provide a method for producing a high-rigidity iron-based alloy that suppresses aggregation of titanium boride in an iron-based matrix.SOLUTION: The present invention relates to a method for producing a high-rigidity iron-based alloy, the method including (i) a step of mixing an iron-based powder and a titanium boride powder to obtain a mixed powder, and (ii) a step of processing the mixed powder obtained in step (i) by an additive manufacturing method involving laser irradiation to obtain a high-rigidity iron-based alloy, the method including a step in which a laser scanning speed is 1000 mm / second to 2600 mm / second.SELECTED DRAWING: Figure 2