427 results about "Boride" patented technology

The invention provides spherical porous carbon as well as a preparation method and application thereof, and relates to the technical field of porous carbon materials. The preparation method provided by the invention comprises the following steps: carrying out spray drying on a phenolic resin solution in which lithiates and borides are dissolved to obtain resin microspheres; pre-oxidizing the resin microspheres at the temperature of 150-300 DEG C to obtain a carbon sphere precursor; carbonizing the carbon sphere precursor in an inert atmosphere at the temperature of 1000-1200 DEG C to obtain carbon microspheres; performing cyclic activation and pore forming on the carbon microspheres in an active atmosphere of 800-1000 DEG C to obtain porous microspheres; and reducing the porous microspheres in a reducing atmosphere of 400-600 DEG C to obtain the spherical porous carbon. The spherical porous carbon material with developed micropores and high specific surface area can be prepared, meanwhile, the coulombic efficiency is high, the conductivity is good, the used preparation method is simple and efficient, and large-scale industrial production is facilitated.

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 discloses a rare earth boride nano material as well as a preparation method and application thereof. The phase state of the rare earth boride nano material is REB6 or REB4; the preparation method comprises the following steps: S1, respectively weighing a compound raw material containing an RE element and a compound raw material containing a B element; s2, adding an additive, and fully grinding; s3, reacting under the protection of inert gas; s4, after the reaction is finished, excessive methanol is added, centrifugal separation is performed after no bubbles emerge, and a precipitate A is reserved; s5, adding diluted hydrochloric acid for soaking, and performing centrifugal separation again to reserve a precipitate B; and S6, washing the precipitate B with deionized water, and drying to obtain the rare earth boride nano material. According to the preparation method disclosed by the invention, a normal-pressure and low-temperature preparation method is adopted, the pure-phase rare earth hexaboride nanocrystal can be obtained at normal pressure and the temperature as low as 300 DEG C, and no active metal elementary substance needs to be introduced in the preparation process.

The invention relates to a high-temperature-resistant light stealth coating material and a preparation method thereof, and belongs to the technical field of functional materials, the high-temperature-resistant light stealth coating material comprises the following raw materials: boride, silicide, a titanate fluxing agent, metal coated carbide, a zinc oxide coated nano carbon material and a sintering aid; according to the prepared high-temperature-resistant light stealth coating material, the infrared emissivity at the wavelength of 3-5 [mu] m is 0.231-0.245, the infrared emissivity at the wavelength of 8-14 [mu] m is 0.424-0.441, the tensile bonding strength is 40.8-46.4 MPa, and the thermal shock resistance frequency is 153-167.

The invention belongs to the technical field of ceramic materials, and discloses a high-entropy boride composite silicon carbide ceramic with a controllable microstructure and a preparation method and application thereof. The method comprises the following steps: carrying out ball milling, drying and sieving on Zr, Ta, Nb, W, Cr, B4C and SiB6 to obtain mixed powder; the preparation method comprises the following steps: putting a boron carbide powder into a graphite mold of which the inner surface is coated with a BN layer, heating to 1850-2050 DEG C, carrying out SPS sintering, and preparing the high-entropy boride composite silicon carbide ceramic with controllable microstructure under 20-35 MPa and a vacuum degree of 10 Pa, and the molecular formula of the high-entropy boride composite silicon carbide ceramic is (Zr0. 2Ta0. 2Nb0. 2W0. 2Cr0. 2) B2-SiC. The ceramic has good mechanical properties, the hardness at room temperature is 27-32 GPa, the fracture toughness is 4.5-6 MPa.m < 1 / 2 >, the bending strength is 450-600 MPa, and the ceramic can be applied to extreme environments or the field of radiation protection.

The invention relates to the technical field of anti-oxidation coatings, and particularly discloses a tantalum-tungsten alloy anti-oxidation coating and a preparation process thereof. The tantalum-tungsten alloy anti-oxidation coating comprises a transition layer, an inner layer, a barrier layer and an outer layer which are stacked in sequence, the transition layer is prepared from the following raw materials: an Ir target, a Ta target and an Re target are adopted for co-sputtering; the inner layer is prepared from the following raw materials in parts by mass: Si, MoSi2, Y and Ta-W alloy powder; the barrier layer is prepared from the following raw materials in parts by mass: Al2O3, Yb2O3 and 3YZrO2; the outer layer is prepared from the following raw materials in parts by mass: a compound: Yb2O3, La2O3, Gd2O3, SiC and B4C; and the multi-element borides comprise ZrB2 and HfB2. The tantalum-tungsten alloy anti-oxidation coating prepared in the invention has relatively good high-temperature oxidation resistance.

The invention discloses a modified lithium-rich manganese-based positive electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery positive electrode materials. On the basis of a traditional metal modified lithium-rich manganese-based material, boride and MBene are further introduced for synergistic modification, so that the conductivity can be remarkably improved, the specific capacity and rate capability of the battery can be improved, the spinel structure of the lithium-rich manganese-based positive electrode material can be stabilized, the cycle performance of the material can be improved, and the service life of the battery can be prolonged.

The embodiment of the utility model provides a cathode assembly and an electron emission device. The cathode assembly comprises a cathode emitter, the first end of the cathode emitter is used for emitting electrons outwards, and the material of the cathode emitter at least comprises boride; the first heating part is used for irradiating the cathode emitter with laser so as to heat the cathode emitter; the second heating part is connected to the second end of the cathode emitter, and the second heating part heats the cathode emitter by generating joule heat; and the second heating component is used for heating the cathode emitter together with the first heating component after the first heating component heats the cathode emitter to a first temperature threshold value.

The invention provides a silicon carbide fiber reinforced ceramic-based composite material as well as a preparation method and application thereof, and belongs to the technical field of ceramic-based composite materials. The composite material comprises a silicon carbide fiber reinforced phase, a boron nitride interface layer and a silicon-based multiphase ceramic matrix from inside to outside, the silicon-based multiphase ceramic matrix comprises an infiltration reaction generation phase, an introduced ceramic particle phase and a silicon-containing binary alloy phase, and the infiltration reaction generation phase comprises a water-oxygen corrosion resistant phase, a silicon phase, a silicon carbide phase and a boride phase. The water oxygen corrosion resistant phase comprises a compound of boron and any element of yttrium, ytterbium, hafnium, molybdenum and aluminum, the boride phase comprises B12 (C, Si, B) 3, the bending strength of the composite material is larger than or equal to 600 MPa, and the fracture toughness of the composite material is larger than or equal to 19 MPa.m < 1 / 2 >. According to the preparation method, the matching property among the components of the composite material is optimized, the mechanical property of the composite material is improved, and a new thought and a process method are provided for preparing the high-strength and water-oxygen-corrosion-resistant ceramic matrix composite material.

A magnetic memory device may include a pinned magnetic pattern and a free magnetic pattern which are stacked on a substrate, a tunnel barrier pattern between the pinned magnetic pattern and the free magnetic pattern, a capping pattern on the free magnetic pattern, and a non-magnetic pattern between the free magnetic pattern and the capping pattern. The free magnetic pattern may be between the tunnel barrier pattern and the capping pattern. The non-magnetic pattern may include a first non-magnetic metal and boron, and the capping pattern includes a second non-magnetic metal. A boride formation energy of the second non-magnetic metal may be higher than a boride formation energy of the first non-magnetic metal.

The invention provides a method for preparing a zirconium boride ceramic material through pressureless sintering, and belongs to the technical field of zirconium boride ceramics. The method comprises the steps of preparing zirconium boride composite powder, modifying silicon carbide nanowires and mixing and sintering. The method for modifying the silicon carbide nanowire comprises the steps of acid treatment and modification, the modification step comprises the following steps: adding aluminum isopropoxide into absolute ethyl alcohol, adding a nitric acid solution, stirring for 1.5-2.0 hours at the temperature of 60-63 DEG C, adding the acid-treated silicon carbide nanowire, carrying out ultrasonic dispersion and water bath evaporation, then drying, putting into a muffle furnace, and carrying out heat preservation for 2.0-2.2 hours at the temperature of 490-500 DEG C to obtain a modified silicon carbide nanowire; the ceramic material prepared by adopting the method disclosed by the invention is high in density, good in mechanical property and excellent in high-temperature oxidation resistance and stability in a complex environment.

The invention relates to a high-strength and high-toughness hard alloy material and a preparation method thereof, and belongs to the technical field of alloy material preparation, the hard alloy material specifically comprises the following raw materials by mass: 75-80 parts of WC, 5-8 parts of TiC, 10-12 parts of Co-Ni alloy, 0.5-1 part of rare earth oxide, 11-15 parts of an interface optimization material and 0.1-0.15 part of a graphene-carbon nanotube hybrid material; wherein the rare earth oxide is Y2O3; the interface optimization material is obtained by mixing high-entropy alloy, boride and carbonitride. A gradient interface is constructed by compounding the high-entropy alloy, the boride and the carbonitride, and the grain boundary pinning effect of the graphene-CNT hybrid material and the cryogenic-aging synergistic process are combined, so that the toughness contradiction of the traditional hard alloy is broken through, and an innovative solution is provided for high-end equipment manufacturing.

The invention relates to the technical field of high-entropy ceramic powder, in particular to diboride high-entropy ceramic powder and a preparation method thereof.The preparation method comprises the following steps that five transition metal oxides, boron powder and fused salt serve as raw materials, are evenly mixed through a mixer and then are dried at the temperature of 60-200 DEG C, and a mixture is obtained; then, the mixture is put into a corundum crucible, and heat preservation is conducted for 1-20 h at the temperature interval of 700-1600 DEG C and under the protective atmosphere; and after the reaction is completed, cooling, washing, carrying out suction filtration, and drying at 60-200 DEG C to finally prepare the diboride high-entropy ceramic powder. The method has the advantages of low synthesis temperature, small product particle size, uniform element distribution, environment friendliness and the like, and the prepared diboride high-entropy ceramic powder shows excellent electromagnetic wave absorption performance.

The invention relates to the technical field of high-entropy boride ceramic materials, in particular to a high-entropy boride ceramic material and a preparation method and application thereof. The invention provides a preparation method of a high-entropy boride ceramic material, which comprises the following steps: mixing transition metal oxide and boron carbide to obtain mixed powder; and sequentially carrying out heat treatment and sintering on the mixed powder to obtain the high-entropy boride ceramic material, the mass percent of the boron carbide in the transition metal oxide is 15-40%. The preparation method can solve the problem of abnormal grain size growth caused by high-temperature sintering, and meanwhile, the prepared high-entropy boride ceramic material is small in grain size, high in density, excellent in fracture toughness and bending strength and good in mechanical property.

The invention relates to a process for preparing a phosphor copper rod by using a phosphonate-amide composite purifying agent as a quenching aid, and belongs to the technical field of non-ferrous metallurgy. Phosphorus pentoxide and sodium carbonate are mixed and decocted into fused salt, the fused salt is cooled and ground and then added into a corundum crucible together with scrap copper to be rapidly heated, compressed air is blown in, and slagging-off is conducted after heat preservation and standing; blowing mixed gas into the melt for reduction refining; adding calcium boride into the melt for refining; the refined copper liquid is subjected to continuous casting and continuous rolling; rapidly immersing the phosphorus copper rod subjected to continuous casting and rolling into a quenching aid solution, and carrying out quenching treatment; and the quenched phosphor copper rod is blow-dried and dried, and the high-conductivity phosphor copper rod is obtained. The high-purity phosphorus copper rod prepared by the method is excellent in key indexes of copper content, phosphorus content and conductivity, and meets the expected requirements of high purity and high conductivity.

The present invention discloses an alkali-resistant castable for a lime rotary kiln working lining, as well as its preparation method and application. The present invention comprises the following raw materials in parts by mass: 100 parts premixed granular material; 50-55 parts premixed fine powder; and 9-13 parts potassium dihydrogen phosphate solution. The premixed granular material comprises magnesia aluminate spinel particles and calcium hexaaluminate particles; and the premixed fine powder comprises magnesia rhodonite fine powder, enstatite fine powder, zirconium boride fine powder, and amorphous Al2O3 fine powder. The alkali-resistant castable for the lime rotary kiln working lining prepared by the present invention has excellent construction performance. After being cast into the lime rotary kiln working lining, it does not require additional heat treatment or firing, thus saving energy. The castable has high high-temperature strength, low bulk density, low thermal conductivity, high alkalinity, strong resistance to alkali corrosion, and is non-ringing and slag-resistant. The castable has good fluidity, ensuring good overall sealing of the lime rotary kiln working lining. The alkali-resistant castable produces no toxic components before and after construction, making it environmentally friendly.

The invention relates to the technical field of ceramic material preparation, in particular to core-shell structure ceramic powder and a preparation method and application thereof.The surface of boride ceramic powder is coated with a uniform carbon layer, then the carbon layer is mixed with silicon powder, thermal treatment is conducted through Joule thermal equipment, and the boride ceramic powder coated with a silicon carbide layer is obtained; the prepared composite ceramic powder has good sinterability and oxidation resistance, a composite ceramic block or a ceramic-based composite material is prepared by sintering the composite ceramic powder as a raw material, and the long-acting oxidation / ablation resistance can be effectively improved, so that the composite ceramic powder can be used as a thermal structure component on a remote high-speed aircraft; the preparation process is simple, the reaction condition is mild, the period is short, the cost is low, and the problems that in the prior art, the boride and silicon carbide composite ceramic powder preparation process is complex, and the service requirement in an extreme environment cannot be met are solved.

The application belongs to the technical field of ceramics, and particularly relates to a preparation method of high-entropy boride-silicon carbide composite ceramics, which comprises the following steps: mixing high-entropy boride powder and carbon source powder, and then adopting a ceramic forming method to prepare a ceramic green body; embedding the ceramic green body with silicon powder, and performing liquid silicon infiltration treatment in a vacuum environment to obtain high-entropy boride-silicon carbide composite ceramics. The application mixes high-entropy boride and carbon source, and then performs liquid phase silicon infiltration, so that the process is simpler, the residual Si content is relatively less, and high-entropy boride-silicon carbide composite ceramics with a density of more than 99% can be obtained, which is suitable for large-scale production and application.

The invention provides a refractory ceramic-based material for a smelting furnace lining and a preparation method of the refractory ceramic-based material, and belongs to the technical field of ceramic refractory materials. The material comprises coated modified fused magnesite main aggregate, ceramic sand main aggregate, surface coated magnesium oxide fine powder, gamma-phase aluminum oxide micro powder, an aluminum dihydrogen phosphate solution, alkaline silica sol, a pre-reaction spinel precursor and zirconium boride micro powder. The coated modified fused magnesite main aggregate is prepared by mixing and sintering fused magnesite, silicon carbide composite powder, chromium sesquioxide powder and phenolic resin powder. And mixing the silicon carbide powder and the magnesium oxide powder, and depositing a silicon nitride layer on the particle surface to prepare the silicon carbide composite powder. The surface-coated magnesium oxide fine powder is formed by coating the surfaces of magnesium oxide fine powder particles with aluminum oxide. The pre-reaction spinel precursor is prepared by the following steps: preparing a mixed salt solution from magnesium nitrate hexahydrate and aluminum nitrate nonahydrate by using deionized water, reacting, aging and carrying out heat treatment. And the ceramic sand main aggregate is made of zirconium oxide. And all the layers are matched for use to realize balanced improvement of performance.

The invention belongs to the technical field of special ceramic preparation, and particularly relates to high-strength special ceramic and a preparation method thereof. The high-strength special ceramic is prepared from the following raw materials: alumina powder, quartz powder, serpentine, phosphorus slag, eucryptite, barium borate, nano yttrium trifluoride, nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane. According to the high-strength special ceramic disclosed by the invention, the aluminum oxide powder, the quartz powder, the serpentine and the phosphorus slag are taken as matrix raw materials, eucryptite, barium borate and yttrium trifluoride are taken as fluxing agents, and nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane are taken as fillers, so that the prepared special ceramic has excellent bending strength and fracture toughness.

The invention discloses a method for promoting matching of thermal expansion coefficients of a glass through hole substrate and copper through magnetron sputtering of a boride-doped metal barrier layer, which comprises the following steps of: after carrying out ultrasonic cleaning and oxygen plasma treatment on the glass through hole substrate, co-sputtering and depositing the boride-doped metal barrier layer on the substrate in a vacuum environment and inert gas; and finally, sputtering and depositing metal Cu on the substrate, wherein the metal is any one of Ag, Ti, Cr and Bi. According to the invention, the multi-target co-sputtering technology is adopted, and the metal-doped ZrB2 thin film is introduced to relieve the thermal expansion coefficient difference between the Cu thin film and the glass substrate so as to promote the thermal expansion coefficient matching between the glass through hole substrate and the copper layer, so that the generation of residual stress in the copper electroplating process is reduced, and the warping phenomenon of the copper film is prevented. The boride doped metal disclosed by the invention has excellent conductivity and dielectric constant, so that an electromagnetic coupling effect does not occur in a signal transmission process, and the integrity of the signal is ensured.

The invention provides a high-temperature-resistant creep-resistant tungsten alloy, and relates to the technical field of powder metallurgy, the tungsten alloy comprises, by mass, 3-8 wt% of Re, 0.2-1 wt% of carbide, 0.1-0.5 wt% of boride, and the balance tungsten and inevitable impurities; the carbide is selected from one or more of TiC, ZrC, TaC and HfC; the boride is selected from one or more of TiB2 (titanium diboride), HfB2 (hafnium diboride) and ZrB2 (zirconium diboride). The high-temperature-resistant creep-resistant tungsten alloy is prepared by adding low-content rhenium, carbide and boride into pure tungsten and adopting a unique preparation method, and the technical defects that an existing tungsten-rhenium alloy is insufficient in strength and creep resistance at the ultrahigh temperature (larger than or equal to 2000 DEG C), and a traditional multi-pass processing technology is complex are overcome.

The invention provides a micron-scale high-melting-point oxide sheet layer enhanced ultra-high-temperature ceramic-based anti-ablation composite coating and a preparation method thereof.The preparation method comprises the steps that ultra-high-temperature carbide / boride ceramic powder, silicide powder and high-melting-point metal oxide powder are mechanically mixed, and spraying mixed powder with uniform components is obtained; the mixed powder is sprayed on the surface of a base body in a plasma spraying mode, and the ultra-high-temperature ceramic-based anti-ablation composite coating containing a micron-scale oxide lamellar structure is obtained; the lamellar high-melting-point oxide phase is introduced into the ultrahigh-temperature ceramic-based composite silicide coating, so that the problem that the silicon-containing glass phase is easy to lose and splash under high-heat-flow scouring is effectively solved. The high-melting-point oxide sheet layer serves as a physical barrier, can effectively limit flowing of a silicon-containing glass liquid phase in the ablation process and allows gaseous oxidation products to escape at the same time, so that a firmly-attached composite oxide layer is formed, and the oxidation resistance and the anti-scouring and anti-stripping capacity of the coating are greatly improved.

The invention discloses 5-hydroxymethylfurfural and a preparation method thereof, and belongs to the technical field of chemical engineering. The preparation method comprises the following steps: reacting a homogeneous aqueous solution containing fructose, inorganic salt and an acid catalyst in a multi-kettle series reactor to obtain the 5-hydroxymethylfurfural, the inorganic salt is selected from at least one of halogen compounds, borides, silicate, aluminate, phosphate and borate; the acidic catalyst comprises at least one of water-soluble acids. The specific inorganic salt and the specific acid catalyst are added and can play a synergistic role, the reaction is carried out under multi-kettle series connection, the backmixing degree of the reaction materials in the reactor is maximized, side reactions can be effectively controlled, black rot is avoided, the reaction production efficiency and conversion rate are effectively improved, the reaction selectivity is improved, and the method is suitable for industrial production. And the equipment maintenance and labor cost is greatly reduced.

The invention relates to a preparation method of a low-density boride aerogel material, and aims to solve the problems of high density, large pore diameter and poor heat insulation performance of the existing boride ceramic material with a porous structure, the method comprises the following steps: 1) preparing tannic acid-formaldehyde sol, and pre-gelling at a constant temperature; 2) preparing M / B precursor sol, and carrying out pregelation at a constant temperature; 3) mixing the tannic acid-formaldehyde sol and the M / B precursor sol, and fully and uniformly stirring to obtain mixed sol; 4) sealing and storing the mixed sol at a constant temperature to obtain boride precursor wet gel; (5) carrying out absolute ethyl alcohol replacement on the boride precursor wet gel, and drying at normal pressure to obtain boride precursor aerogel; and 6) carrying out high-temperature sintering on the boride precursor aerogel in a tubular furnace to obtain the pure-phase boride aerogel. The low-density boride aerogel material with a complete structure can be obtained, the material phase purity is high, the density and aperture are adjustable, the light absorption performance is excellent, the maximum porosity is-95%, and the low-density boride aerogel material has wide application prospects in the field of thermal protection of aircrafts as a light thermal insulation material.

The invention relates to the technical field of dissimilar material connection, in particular to a method for regulating and controlling molybdenum steel brazed joint intermetallic compounds based on transition elements. According to the technical scheme, the method comprises the following steps that a transition element coating is deposited on the surface of a molybdenum matrix, transition elements are selected from one or more of Ti, V, Nb, Zr, Hf and Ta, and the molybdenum matrix and a steel matrix are brazed through boron-containing Ni-based brazing filler metal; in the brazing process, the transition element and the boron element preferentially react to generate a transition element boride, and therefore generation of MoNiBintermetallic compounds is inhibited. According to the method, the transition element coating is introduced, a brazing interface reaction path is actively intervened and reconstructed from the thermodynamic angle, and the problem of continuous generation of the brittle MoNiBintermetallic compound in the molybdenum / steel brazing joint is fundamentally solved.

The invention discloses a high-performance corundum-based repairing material and a preparation method thereof, and belongs to the technical field of furnace lining repairing materials, the high-performance corundum-based repairing material comprises the following preparation raw materials by mass: 60-80 parts of aggregate, 10-30 parts of powder, 8-20 parts of a binder and 0.5-2 parts of an additive; the aggregate comprises fused white corundum and fused magnesium aluminate spinel; the powder comprises white corundum powder, rare earth modified alumina powder and boride. The preparation method of the high-performance corundum-based repairing material comprises the following steps: adding the powder into the aggregate, carrying out uniform dry mixing, adding the organic binding agent, then adding the silica sol, and finally adding the additive. The high-performance corundum-based repairing material disclosed by the invention is high in early strength and still has relatively long service life in a high-temperature environment.

The invention discloses an anti-crack nickel-based superalloy and a preparation method and application thereof, and belongs to the technical field of nickel-based alloys. The anti-crack nickel-based superalloy comprises, by mass, 12%-18% of Cr, 10%-20% of Ni, 10%-20% of Ni and the balance Ni; 8%-15% of Co; 3 to 6 percent of Mo; 2 to 4 percent of W; 1 to 3 percent of Al; 2 to 4 percent of Ti; 0.5 to 2 percent of Ru; 0.3%-1% of Y; b: 0.002 to 0.01% of the total weight of the raw materials; and the balance of Ni and inevitable impurities. According to the invention, aluminum is passivated by the rare earth oxide to form a Y2O3 passivation layer, so that the precipitation of a low-melting-point phase is effectively inhibited, the crack propagation rate under high-temperature cyclic load is remarkably reduced, the grain boundary binding energy is optimized, and the long-term service stability of the alloy in an oxidation-hot corrosion coupling environment is improved. Through a Ni-B intermediate alloy preparation process and carbon thermal reduction and liquid filtration technologies, boron element segregation and brittle boride formation are avoided, a grain boundary stress concentration source is eliminated, and boron elements are uniformly distributed on a matrix, so that the intergranular fracture tendency is inhibited under high-temperature and high-stress conditions, and the service life of the alloy is prolonged.

The invention relates to an amorphous reconstruction hydrogen evolution catalyst and a preparation method and application thereof. The amorphous reconstruction hydrogen evolution catalyst is of a heterostructure, the surface layer of the amorphous reconstruction hydrogen evolution catalyst is a transition metal oxide, and the inner layer of the amorphous reconstruction hydrogen evolution catalyst is a transition metal boride or a transition metal boron-phosphorus co-doped compound; the transition metal oxide, the transition metal boride and the transition metal boron-phosphorus co-doped compound are all in an amorphous state; transition metals in the amorphous state reconstruction hydrogen evolution catalyst are at least two of Fe, Co, Ni, Ce, Cu, Mn, V, W and Mo.

The invention discloses a tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic material as well as a preparation method and application thereof. The preparation method of the tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic material comprises the following steps: 1) preparing a green body from metal oxide powder and boron carbide powder; 2) performing electric field sintering, crushing and screening on the green body to prepare tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic powder; and 3) pressing the tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic powder into a green body, and then carrying out spark plasma sintering. The tungsten-containing ultra-high-temperature high-entropy rare earth boride ceramic material has excellent ultra-high-temperature oxidation resistance, is wide in component space range and low in cost, has a very wide application prospect in ultra-high-temperature thermal protection components such as the leading edge, the nose cone and the control surface of a hypersonic aircraft, and has a wide application prospect. And the preparation method has the advantages of simple operation and process flow, short reaction time, low synthesis cost and the like, and is suitable for large-scale industrial production.