882 results about "Yttrium(III) oxide" patented technology

The invention relates to the technical field of ceramic substrates, and provides an aluminum oxide high-temperature co-fired multilayer ceramic substrate and a preparation method thereof. The aluminum oxide high-temperature co-fired multilayer ceramic substrate comprises the following raw materials in parts by weight: 80-90 parts of aluminum oxide, 3-6 parts of a reinforcing agent, 2-5 parts of a sintering aid, 85-95 parts of a solvent, 6-12 parts of a binder and 0.5-1.5 parts of a dispersing agent, the reinforcing agent comprises yttrium oxide coated silicon carbide and copper oxide. According to the technical scheme, the problem that the strength of the aluminum oxide high-temperature co-fired multilayer ceramic substrate is insufficient due to long-time high-temperature sintering of a low-viscosity liquid phase in related technologies is solved.

The invention discloses a preparation method and application of a plasma etching resistant coating, and relates to the technical field of coatings. Comprising the steps that a yttrium oxide layer is prepared through a low-pressure plasma spraying method, the yttrium oxide layer comprises a relative porous layer (the porosity is 1%-3%) and a compact layer (the porosity is smaller than 1%) which are sequentially stacked, and the relative porous layer is used for making contact with a base body. By adopting low-pressure plasma spraying, the yttrium oxide layer with controllable coating morphology and thickness can be obtained, and the thermal expansion coefficient mismatch between the substrate and the compact layer can be effectively relieved through the relative porous layer close to the substrate; the compact layer on the surface is uniform in structure, low in porosity, excellent in cohesion strength and excellent in plasma etching resistance, plasma and a matrix can be isolated, and generation of particles in the etching process is avoided. The compact layer and the relatively porous coating are both prepared on the basis of the same powder material and by adopting the same coating deposition equipment, so that the production efficiency can be improved, and the production cost and the pollution risk caused by transfer between production steps can be reduced.

The invention relates to the technical field of titanium alloy metallurgical powder, in particular to a preparation method of titanium alloy metallurgical powder. Comprising the following steps that firstly, titanium alloy raw materials are smelted into melt, and the melt is guided into an electromagnetic centrifugal device under the protection of inert gas; 2, primary crushing is conducted on the melt through an electromagnetic centrifugal device, the rotating speed is larger than or equal to 25000rpm, and pre-crushed particles with the particle size being 100-200 microns are obtained; 3, the pre-crushed particles are conveyed to an ultrasonic-assisted gas atomization chamber, argon and helium mixed gas is introduced, 20-40 kHz high-frequency ultrasonic waves are applied, and atomization refining is carried out; 4, the atomized particles are cooled to form titanium alloy metallurgical powder; according to the method, 1 vol% of modified yttrium oxide particles are introduced into atomized gas of the ultrasonic-assisted gas atomization chamber, the oxygen content of the titanium alloy powder can be reduced to 600-800 ppm from conventional 1200-1500 ppm, the reduction amplitude is about 40-50%, oxygen embrittlement can be effectively avoided, and the ductility and high-temperature strength of the alloy are improved.

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention discloses a preparation method of a toughening environmental barrier coating, and relates to a preparation method of a coating. The invention aims to solve the problem of poor fracture toughness of the existing environmental barrier coating. The method comprises the following steps: 1, pretreating a base material; 2, preparing a bonding layer; and 3, preparing the environmental barrier layer. The high-melting-point metal silicide prepared on the surface of the base material or the bonding layer compounded by the high-melting-point metal silicide and the rare earth silicate has excellent temperature resistance and good interface bonding strength, and due to the addition of the rare earth silicate, the expansion coefficient of the bonding layer is highly matched with that of the base material; according to the prepared yttrium oxide stabilized zirconia fiber, mullite fiber or silicon carbide fiber reinforced rare earth silicate environmental barrier layer, the fracture toughness of pure Yb2SiO5 is improved to 6.5 MPa.m < 1 / 2 >-8.0 MPa.m < 1 / 2 > from about 1.85 MPa.m < 1 / 2 >. The strengthening and toughening environmental barrier coating prepared by the invention has very important significance on development of thermal protection coatings of hot end parts of aircrafts with high thrust-weight ratios in China.

The invention discloses a silicon nitride ceramic-based composite material and a preparation method thereof, and relates to the technical field of silicon nitride ceramics. The silicon nitride ceramic-based composite material is prepared from silicon dioxide coated modified boron nitride and resin composite phase change microcapsules, Si3N4-C coated Al2O3 core-shell fiber aerogel, nano yttrium oxide and polyvinyl butyral, the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules are stably attached to the surface of the Si3N4-C coated Al2O3 core-shell fiber aerogel in a chemical bonding and mechanical interlocking mode, the interface bonding strength is enhanced, the risk of phase separation is reduced, the combination effect of the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules and the Si3N4-C coated Al2O3 core-shell fiber aerogel is better exerted, and the composite phase change effect of the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules is improved. According to the present invention, the fracture toughness can be improved through fiber toughening, aerogel pore and microcapsule stress dispersion, the high temperature resistance can be improved through the low thermal conductivity of the aerogel and the heat absorption effect of the microcapsule, the mechanical property of the silicon nitride can be significantly improved through multiple ways and multiple modes, and the high temperature resistance can be effectively enhanced.

The invention relates to the technical field of coating preparation, in particular to a spraying process of a compact yttrium oxide coating, which comprises the steps of pretreatment, powder activation, matrix surface modification, meltallizing spraying, cooling curing, de-shielding treatment and post-cleaning. Yttrium oxide powder is activated through low-temperature plasma, sand blasting parameters and a high velocity oxy-fuel spraying process are optimized, the porosity of the coating is remarkably reduced to 1.5% or below, and the hardness is improved to 500 HV0.3. Internal stress is reduced in a sectional cooling mode, and balance of coating performance and economical efficiency is achieved in combination with a parameter optimization algorithm based on particle deposition dynamics. The preparation method can meet the requirement of the high-end semiconductor manufacturing field on a high-performance protective coating, and solves the problem of high porosity of a traditional process.

The invention relates to a preparation method of an etching-resistant and wear-resistant Y2O3-AlxOy composite coating. The preparation method comprises the following steps: carrying out ultrasonic cleaning on a corrosion-resistant matrix; performing plasma bombardment cleaning activation on the surface of the corrosion-resistant matrix; a Y2O3 coating and an AlxOy coating are alternately deposited on a corrosion-resistant base body in a double-target magnetron sputtering mode to form the Y2O3-AlxOy composite coating, the sputtering power of a Y target is larger than that of an Al target, and the ratio of x to y in the AlxOy coating is larger than 1. According to the method, the amorphous AlxOy coating dominated by the metal state is introduced into the Y2O3 coating, growth of Y2O3 columnar crystals is continuously broken, crystal grains are refined, formation of intergranular easy-to-etch point locations is inhibited, and an yttrium aluminum oxide composite strengthening phase is formed at an interface, so that plasma etching resistance is improved; the thickness of a single-layer coating in the composite coating is very thin; under the action of growth stress, the structure of the coating presents a wave-shaped microstructure and a soft and hard alternate mechanical structure, and the soft and hard alternate mechanical structure is beneficial to inhibiting generation of transverse cracks, guiding friction crack level expansion, prolonging the friction life of the coating and reducing the wear rate.

The invention relates to the technical field of refractory materials, and discloses a rotary kiln lining refractory material and a preparation method thereof, the raw materials comprise mullite, boron carbide, calcium hexaluminate, silicon carbide, silica powder, alpha-alumina micro powder, coating powder, modified refractory fiber, and a binder. The mullite and the boron carbide are selected as base materials and have excellent acid corrosion resistance, the titanium dioxide and the aluminum oxide are used for treating the refractory fibers, so that a compact enrichment layer is formed, low-temperature sintering is promoted by adding the yttrium oxide, the titanium dioxide is introduced into the refractory fibers, and the corrosion resistance of the refractory fibers is improved. And micropores in the fiber surface can be blocked, so that the porosity of the refractory material is reduced, and the diffusion path of acid steam is prolonged. The refractory material provided by the invention has excellent high-temperature stability and corrosion resistance.

The invention discloses a preparation method of low-temperature rapid densification silicon nitride ceramic based on an aluminum oxide-yttrium oxide composite sintering aid, and aims to solve the problems of high temperature, high energy consumption, difficult densification and the like in the existing Si3N4 ceramic preparation. The preparation method comprises the following steps: 1, mixing alpha-Si3N4 powder, Y2O3 powder and Al2O3 powder, and carrying out ball milling dispersion to obtain mixed powder; 2, carrying out rotary evaporation drying on the mixed powder under a vacuum condition; 3, carrying out heat preservation treatment under the conditions of 1600-1700 DEG C and 40-60 MPa through a spark plasma sintering process; and 4, demolding after cooling. Under the action of the Al2O3-Y2O3 composite sintering aid, phase transformation from alpha-Si3N4 to beta-Si3N4 is remarkably promoted, the relative density of the ceramic reaches 97%-99%, the fracture toughness of the ceramic is 5.21 MPa.m < 1 / 2 >, and the bending strength of the ceramic is 924.99 MPa.

The invention provides a plasma spraying high-temperature-erosion-resistant coating and a coating preparation method, and relates to the technical field of material surface treatment. Comprising the following components in parts by mass: 30-45 parts of tungsten carbide, 15-25 parts of chromium carbide-nickel-chromium alloy, 15-25 parts of yttria-stabilized zirconia, 5-10 parts of aluminum oxide-titanium dioxide composite ceramic, 10-20 parts of nickel-chromium-aluminum-yttrium alloy, 1-3 parts of nano aluminum oxide and 1-3 parts of lanthanum oxide. Multiphase collaborative design is adopted, tungsten carbide and chromium carbide-nickel-chromium alloy form double hard phases, the hardness is higher, aluminum oxide-titanium dioxide composite ceramic fills pores and improves compactness, rare earth and nanometer are adopted to cooperate, lanthanum oxide and nanometer aluminum oxide react to generate a LaAlO3 protective layer, oxidation weight gain is small, oxygen diffusion is inhibited, nanometer aluminum oxide refines grains, and the hardness is higher. In conclusion, the high-temperature oxidation resistance is high, and the erosion rate is low.

The invention provides a setter plate for sintering a powder metallurgy product and a preparation method of the setter plate, and belongs to the technical field of setter plates. The refractory material is prepared from the following raw materials in parts by weight: 20-40 parts of fused zirconium mullite, 20-40 parts of modified sintered corundum, 30-50 parts of alumina micro powder, 0.5-1 part of yttrium oxide / alumina-carbon nanotube hollow microsphere powder, 0.5-1 part of zinc oxide micro powder and 5-10 parts of a binder. The setter plate for sintering the powder metallurgy product has the advantages of good heat insulation, high temperature resistance, thermal shock resistance and chemical stability, good mechanical properties, good hardness and good wear resistance, the problems of cracking, deformation and the like caused by thermal shock are reduced, the service life of the setter plate is prolonged, and the setter plate has a wide application prospect.

The invention discloses a wear-resistant hard alloy material and a preparation method thereof, and particularly relates to the field of alloy materials.The wear-resistant hard alloy material comprises tungsten carbide, cobalt powder, graphene aerogel fragments, coconut shell carbonized porous carbon, yttrium oxide and auxiliaries, and a multi-scale reinforcing system is constructed by optimizing the proportion. According to the preparation method, supercritical drying is combined with a microwave reaction sintering process, and material densification is realized through gradient temperature control and steam concentration accurate regulation and control in a specific atmosphere. Graphene aerogel fragments and porous carbon form a three-dimensional interpenetrating network, so that the wear resistance and the conductivity are synergistically improved; yttrium oxide is segregated at a grain boundary to form a high-temperature anti-oxidation barrier; the gradient sintering process effectively eliminates internal stress and inhibits abnormal growth of grains. The technical bottleneck that wear resistance and toughness of traditional hard alloy are difficult to synergistically improve is broken through, excellent conductivity and high-temperature stability are achieved, and the industrial problems that wear resistance / toughness is inverted, a conductive network is low in efficiency, and the high-temperature stability is poor are solved.

The cBN resin superhard grinding wheel is prepared from the following raw materials in percentage by mass: 30 to 45 percent of cBN grinding material, 1 to 3 percent of nano yttrium oxide, 2 to 3 percent of nano zirconium oxide, 2 to 4 percent of coupling agent, 1 to 3 percent of silicon dioxide compound and the balance of phenolic resin. The phenolic resin matrix is jointly modified by the nano yttrium oxide, the nano zirconium oxide and the specific silicon dioxide compound, and the prepared grinding wheel has good wear resistance, hardness and temperature resistance.

The invention provides a high-performance nitrogen vacancy color center diamond material under yttrium oxide protection and a preparation method and application thereof, and belongs to the technical field of quantum materials. The preparation method comprises the following steps: firstly carrying out electron irradiation and cleaning on a diamond substrate, then processing by adopting nitrogen plasma, then depositing an yttrium oxide coating, and annealing the diamond substrate deposited with the yttrium oxide coating under a vacuum condition to obtain the high-performance nitrogen vacancy color center diamond material. According to the method, the diamond is treated through the nitrogen plasma, so that the displacement nitrogen concentration in the diamond can be increased, and the NV-color center concentration can be increased in the subsequent annealing treatment process; meanwhile, the yttrium oxide coating is deposited on the diamond substrate, so that defects on the surface of the diamond can be reduced, the NV-color center concentration is increased, and the prepared diamond material has excellent corrosion resistance. The diamond material prepared by the preparation method can be used for preparing quantum sensors used under extreme conditions.

The invention discloses a special low-carbon fire-resistant quartziferous dry vibration material and a preparation method thereof, and relates to the technical field of fire-resistant materials. The special low-carbon fireproof quartzite dry vibration material comprises the following components in parts by weight: 70-80 parts of quartz aggregate, 20-30 parts of zirconia coated corundum micro powder, 3-6 parts of aluminum dihydrogen phosphate, 0.5-1 part of lithium borate and 0.5-1 part of yttrium oxide. The preparation method comprises the following steps: adding the quartz aggregate, the zirconia coated corundum micro powder, the dihydrogen phosphate, the lithium borate and the yttrium oxide into a mixer, and uniformly stirring to obtain the product. The quartziferous dry vibration material prepared by the invention has good thermal shock cycle resistance and low carbon content, and is green and environment-friendly.

The invention relates to a high-gloss black decorative glass prepared from sludge incineration ash by an all-electric melting method. The high-gloss black decorative glass comprises the following raw material components in percentage by mass: 75-79% of fly ash, 5-7% of calcium carbonate, 9-10% of sodium carbonate, 5-6% of potassium alkali, 1-1.4% of boric acid, 0.03-0.04% of porous carbon, 0.06-0.08% of semi-coke powder, 0.16-0.22% of cobaltosic oxide, 0.1-0.2% of cerium dioxide, 0.04-0.06% of neodymium oxide, 0.5-0.7% of waste zircon brick powder and 0.03-0.05% of yttrium oxide. The dedusting ash is electrostatic dedusting ash collected by incineration of filtered sludge in a municipal sewage treatment plant, and belongs to hazardous waste; the porous carbon is rich in a hierarchical pore structure of sub-nano pores (0.5-1.0 nm). According to the method, a closed-loop production mode that waste is used for treating waste is constructed, high-added-value decorative materials are produced while energy consumption is reduced, and environmental protection investment is converted into economic benefits.

The invention belongs to the technical field of zirconite porous ceramics, and discloses a method for preparing high-strength zirconite porous ceramics by a foaming injection-coagulation method, which is characterized in that zirconite powder, yttrium oxide powder and manganese oxide powder are used as raw materials, and the foaming injection-coagulation method is adopted to prepare the zirconite porous ceramics. The zirconite porous ceramic is obtained through the steps of syrup solution preparation, ceramic powder premixing, ceramic slurry preparation, injection molding gelling, sintering treatment and the like. The foaming gel casting method is adopted, so that the porosity of the zirconite porous ceramic can be effectively increased, and the heat radiation transmission efficiency is reduced; saccharide is used as a solution medium instead of water, so that the sintering surface is increased and the strength of the porous ceramic is improved; the manganese oxide and the yttrium oxide are added, so that the merging and growing process among zirconite crystal grains is accelerated, the crystal form of zirconium oxide is stabilized at high temperature, cracks caused by crystal form transformation are avoided, the strength of the zirconite porous ceramic is further improved, and the prepared zirconite porous ceramic is stable in high-temperature performance, high in strength and low in heat conductivity coefficient.

The invention relates to the technical field of metal surface coating preparation, in particular to a high-temperature thermal cycle impact resistant yttrium oxide composite coating on the surface of refractory metal and a preparation method of the yttrium oxide composite coating. The refractory metal composite coating material is composed of a refractory metal matrix and a coating. The coating comprises a bonding layer, a middle layer and a surface layer which are arranged in a contact manner; the bonding layer is composed of the refractory metal and yttrium oxide, and the porosity of the bonding layer is 1%-5%; the middle layer is a pure yttrium oxide layer with the porosity of 5%-10%; the porosity of the surface layer is 1t; 2% of a pure yttrium oxide layer; the melting point of the refractory metal is 2470 DEG C or higher. According to the refractory metal composite coating material and the preparation method and application thereof, the refractory metal coating structure is optimized, the porosity of the coating is further adjusted, the high-temperature molten metal corrosion resistance and the high-temperature thermal shock resistance of the coating are improved, meanwhile, the bonding strength between the coatings is guaranteed, and the service life of the coating is prolonged. The method is expected to be applied to high-melting-point metal smelting equipment.

This application relates to the field of metal surface treatment materials, specifically disclosing a silicon-integrated inorganic supercrystalline thermal energy powder and its preparation and application methods. The silicon-integrated inorganic supercrystalline thermal energy powder comprises raw material A and raw material B. Raw material A includes the following: magnesium oxide, sodium fluoroaluminate, sodium polyphosphate, zinc oxide, crystalline tin tetrachloride, silicon dioxide, and boric acid. Raw material B includes the following raw materials in parts by weight: spodumene, lithium carbonate, titanium dioxide, zinc silicate, sodium carbonate, antimony trioxide, albite, fluorite, boric acid, sodium hydroxide, and yttrium oxide. The inorganic supercrystalline thermal energy powder of this application has advantages such as corrosion resistance and oxidation resistance, good thermal stability, no damage from thermal cycling, high hardness, wear resistance and high temperature resistance, energy saving, water scale reduction, and the ability to replace organosilicon high-temperature resistant special coatings, baking paints, enamel paints, and ceramic floor glazes.

The invention relates to preparation of a ZTA composite ceramic material, and belongs to the field of inorganic nonmetal composite materials. The raw material composition formula comprises aluminum oxide, zirconium oxide, zirconium dioxide, yttrium oxide, magnesium oxide and titanium dioxide. The low-sodium microcrystalline alumina powder with the original grain size of 0.40 [mu] m is selected and ground to the original grain size in advance, so that zirconia can be more uniformly distributed between alumina grain boundaries, which is a precondition for obtaining more uniform ZTA. Zirconium dioxide is creatively introduced, and compared with a conventional method in which stable zirconium oxide is directly used, the cost of ZTA is greatly reduced. The pre-calcined granulation powder is adopted, so that a ZTA product which is uniformly mixed in the early stage is cured by adding a stabilizer, and then the uniform and stable ZTA ceramic can be obtained through later-stage forming and firing.

The invention belongs to the technical field of ceramic materials, and particularly discloses whisker toughened zirconium oxide-aluminum oxide composite ceramic and an additive manufacturing method thereof, the composite ceramic comprises the following components by mass: 94 parts of zirconium oxide toughened aluminum oxide ceramic and 5 parts of silicon carbide whisker; the zirconium oxide toughened aluminum oxide ceramic is prepared from the following components in parts by mass: 76 parts of aluminum oxide and 24 parts of zirconium oxide, and 3mol% of yttrium oxide is added into the zirconium oxide. According to the whisker toughened zirconium oxide-aluminum oxide composite ceramic and the additive manufacturing method thereof, the preparation method has unique design of components and process, and the preparation of a high-density and high-performance ceramic-based composite material part based on a fused deposition modeling technology is successfully realized. Further, the prepared silicon carbide whisker toughened zirconium oxide-aluminum oxide-based composite ceramic has relatively high density and excellent obdurability.

The invention belongs to the technical field of ceramic materials, and particularly relates to a composite ceramic material and a preparation method and application thereof. The eutectic ceramic is prepared by taking aluminum oxide and yttrium oxide stabilized tetragonal phase zirconium oxide powder as raw materials and adopting a laser suspension zone melting directional solidification method, the drawing speed of the laser suspension zone melting directional solidification is greater than or equal to 100 mu m / s, and the laser power is greater than or equal to 300W; the eutectic ceramic is sequentially subjected to crushing, smashing and wet screening, eutectic ceramic powder is obtained, and the particle size of the eutectic ceramic powder is 20-100 microns; mixing the eutectic ceramic powder, silicon carbide whiskers and a sintering aid to obtain mixed powder; the mixed powder is subjected to hot pressing sintering, the composite ceramic material is obtained, and the hot pressing sintering temperature is smaller than or equal to 1550 DEG C. The composite ceramic material obtained by the preparation method provided by the invention has both a large size and a fine structure and has a micro-nano eutectic structure, and the mechanical properties of the material are remarkably improved.

The invention relates to the technical field of high-temperature alloy materials, and provides an N10276 profiled bar and a forming method thereof.The surface of a blank is coated with a three-layer composite sheath, the blank is heated in a partitioned and gradient mode, the temperature of a side wing plate area is 50-100 DEG C higher than that of a web plate area, the metal fluidity of a side wing plate is improved, cogging rolling, four-roller reciprocating finish rolling, partitioned and gradient cooling and secondary solution treatment are conducted, and the N10276 profiled bar is obtained. A nitric acid and hydrofluoric acid mixed solution is used for pickling and stripping the composite sheath, an oxide layer is removed, intergranular corrosion is avoided, a triple sheath synergistic protection mechanism is adopted, oxygen is physically isolated by outer stainless steel, and heat loss is inhibited by a middle yttria-stabilized zirconia ceramic fiber layer.

The invention discloses a flame synthesis preparation system and method for a yttrium-stabilized zirconia nano-powder material. The system comprises a flame synthesis module, a raw material conveying module and a powder collecting module, the method comprises the following steps: 1, preparing a precursor solution synthesized by atomizing zirconium oxide nano powder; 2, preparing a precursor solution synthesized by atomizing yttrium oxide nano powder; and step 3, performing atomization synthesis to obtain the yttrium-stabilized zirconia powder material. According to the flame synthesis preparation system and method for the yttrium-stabilized zirconia nano-powder material, the high-performance nano-powder material is synthesized by adopting an atomized flame synthesis method, and the flame synthesis preparation system and method have the advantage that zirconia and yttrium oxide are uniformly doped.

The present invention belongs to the field of inorganic fiber materials with high performance, and provides a basalt fiber based on the phase transformation toughening of zirconia, and a preparation method therefor. The basalt fiber based on the phase transformation toughening of zirconia comprises the following components in parts by mass: 100 parts of basalt, 5-10 parts of a phase transformation toughening material, and 0.5-1.5 parts of inorganic reinforcing whiskers, wherein the phase transformation toughening material comprises a metallic oxide carrier, yttrium-oxide-doped tetragonal nano-zirconia, and a grinding aid. The preparation method comprises: crushing, grinding and sieving basalt, then heating the basalt to melt same, and maintaining the temperature thereof; adding the phase transformation toughening material, performing ultrasonic dispersion, and then cooling same; and adding inorganic reinforcing whiskers, performing ultrasonic dispersion, and then drawing same to obtain a basalt fiber based on the phase transformation toughening of zirconia. The basalt fiber based on the phase transformation toughening of zirconia has better tensile strength and a better tensile modulus of elasticity, and meets the requirements of performance indexes of high-modulus basalt fibers.

The invention belongs to the technical field of ceramic slurry, and particularly relates to ceramic slurry and a preparation method and application thereof.The ceramic slurry comprises inorganic components and organic components, the inorganic components comprise inorganic additives and glass powder, the inorganic additives comprise Al2O3, ZrO2 and Y2O3, and the organic components comprise modified acrylic resin, organic solvent and auxiliaries. By controlling the relative content of carboxyl and ester groups in the modified acrylic resin and utilizing the polarity difference of functional groups, selective adsorption of inorganic powder is realized, so that the dispersion uniformity of the powder in the ceramic slurry is remarkably improved, segregation of yttrium oxide is effectively inhibited, and the service life of the ceramic slurry is prolonged. Therefore, monoclinic-phase zirconium oxide, tetragonal-phase zirconium oxide and cubic-phase zirconium oxide with a proper proportion can be formed in the sintered ceramic substrate, further the bending strength of the ceramic substrate is remarkably improved, and the ceramic substrate is particularly suitable for manufacturing miniaturized and thin electronic components.

The invention provides a preparation method and application of ceramic slurry for high-temperature bonding of aluminum nitride ceramics, and relates to the technical field of high-temperature ceramic materials.The preparation method comprises the following steps that firstly, an organic carrier is prepared, a polymer binder, an organic solvent, a plasticizer and a dispersing agent are weighed according to the weight ratio and stirred at the temperature of 60-70 DEG C till complete dissolution and clarification are achieved for use; 2, an inorganic functional phase is prepared, aluminum nitride powder, yttrium oxide powder and alkaline earth metal oxide powder are weighed according to the weight proportion and placed in a ball milling tank to be evenly mixed, the obtained ceramic slurry serves as a bonding layer, the tolerable temperature can reach 1000 DEG C or above and is far higher than that of metal brazing filler metal, and the ceramic slurry is suitable for severe environments such as aerospace and high-temperature sensors. The main components of the bonding layer are consistent with the base material, and the thermal expansion coefficient is highly matched, so that the thermal stress can be greatly relieved, and the failure of the device caused by thermal fatigue in the temperature cycle is avoided.

The invention relates to the technical field of CO oxidation, in particular to a CO oxidation catalyst, a preparation method of the CO oxidation catalyst and a CO oxidation method. The carrier is selected from one or more of dysprosium oxide, yttrium oxide and holmium oxide, the particle size of the carrier is 20-100 nm, and the average particle size is 25-76 nm; the noble metal is selected from one or more of platinum, ruthenium and palladium, and the content of the noble metal element is 0.1 wt%-2wt% of the carrier. One or more of dysprosium oxide, yttrium oxide and holmium oxide with the particle size of 20-100 nm and the average particle size of 25-76 nm are adopted as the carrier to prepare the CO oxidation catalyst, and the CO oxidation catalyst is used for CO catalytic oxidation, has the advantage of lower carbon monoxide ignition temperature and is long in service life.

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