745 results about "Composite ceramic" patented technology

The invention relates to the technical field of high-entropy ceramic preparation, and particularly discloses (TiZrNbHfTaV) C-SiC high-entropy composite ceramic as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing the (TiZrNbHfTaV) C-SiC high-entropy composite ceramic consisting of double phases of (TiZrNbHfTaV) C and SiC by adopting a rapid hot pressed sintering technology. The preparation process is simple and efficient, and large-scale industrial application is facilitated; the prepared multiphase ceramic is high in density, uniform in organization structure and reasonable in component design, the multiphase ceramic shows excellent mechanical properties, and the hardness, the fracture toughness and the wear rate are 34.00 GPa, 6.4 MPa.m < 1 / 2 > and 1.8 * 10 <-6 > mm < 3 > N <-1 > m <-1 > respectively. Compared with the traditional binary carbide ceramic, the (TiZrNbHfTaV) C-SiC high-entropy composite ceramic disclosed by the invention has excellent hardness and toughness, and the friction and wear properties are remarkably 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 self-cleaning composite piezoelectric ceramic membrane as well as a preparation method and application thereof, and belongs to the field of composite ceramic membranes. The technical problem that an existing ceramic membrane separation technology is poor in biomembrane pollution resisting effect is solved. According to the preparation method, the barium titanate ceramic membrane is firstly prepared to serve as the base membrane, then the copper oxide one-dimensional nanostructure is loaded on the piezoelectric ceramic substrate, and the base membrane has a large membrane surface area and can be combined with more catalysts, so that more active sites are provided for catalytic reaction; according to the composite membrane, the hydrophilicity, the anti-pollution performance and the piezoelectric catalysis self-cleaning performance of the membrane are remarkably improved, and pollutants in water can be quickly and effectively separated, so that the flux and the anti-pollution performance of the membrane are improved.

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 present application belongs to the technical field of ceramic alloy flywheel, and particularly relates to a liquid-liquid composite ceramic inlaid high-wear-resistance flywheel and a preparation method thereof, which is suitable for high-strength impact environment such as mines and metallurgy. The flywheel realizes metallurgical bonding of ceramic-metal by step-by-step pouring and temperature control solidification of basalt melt and high-density W-Ni-Fe alloy melt in a specific mold structure. The ceramic core is composed of multiple inorganic oxides and low-melting-point glass powder, and has excellent interface compatibility and structural stability. During the preparation process, the initial setting state of basalt and the alloy flow path are accurately controlled to improve the interface bonding strength and overall density. The finally obtained flywheel has high hardness, high toughness and excellent wear resistance, and significantly prolongs the service life.

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 a method for preparing a diffusion bonding layer on a nickel-based alloy and YSZ ceramic coating interface, and belongs to the technical field of metal material surface protection and ceramic coatings. According to the preparation method, a YSZ composite ceramic coating is deposited on the surface of the nickel-based alloy by adopting an electrophoretic deposition method, and then an MCr2O5 (M is Zr, Y, Ce, Yb and Al) diffusion bonding layer is prepared on the interface of the nickel-based alloy and the YSZ composite ceramic coating by adopting a pressureless discharge sintering and thermal diffusion treatment method. The bonding layer prepared through the diffusion method is good in interface bonding, the thermal stress between the nickel-based alloy and the YSZ ceramic coating is effectively buffered, the defects that a bonding layer prepared through a traditional method is large in pore impurity amount and the like can be overcome, and the bonding force between the ceramic coating and a base body and the high-temperature anti-oxidation and anti-stripping performance are remarkably improved.

The invention discloses medium and low temperature porous wave-absorbing iron-based composite ceramic and a preparation method thereof. The medium and low temperature porous wave-absorbing iron-based composite ceramic is prepared from the following raw materials in percentage by weight: 10 to 50 weight percent of wave-absorbing functional phase, 20 to 40 weight percent of ceramic matrix, 5 to 15 weight percent of pore forming agent, 5 to 10 weight percent of dielectric loss phase, 0.5 to 1 weight percent of stearic acid, 0.2 to 0.5 weight percent of silane coupling agent and 30 to 34.5 weight percent of binding phase. According to the preparation method, a low-temperature sintering process is adopted for optimization, and the activity of the magnetic loss phase is protected. The iron-based composite ceramic with a gradient porous structure is obtained by adopting a freezing injection molding method, and broadband efficient wave absorption can be realized. The magnetic-dielectric cooperative loss is enhanced, and the limitation of a single mechanism is broken through. Starch or rice hull ash microspheres are used as a degradable pore-forming agent, so that green process and short-process design are realized. The mechanical property and the stability of the iron-based composite ceramic structure are improved, the application scene is expanded, and the cost advantage is achieved.

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 discloses a preparation method of a copper-zirconium alloy wear-resistant coating based on laser cladding, relates to the technical field of wear-resistant coatings, and is used for solving the technical problem that a high-performance wear-resistant coating cannot be prepared due to poor bonding quality and low cladding efficiency of a cladding layer and a copper-zirconium alloy matrix in the existing laser cladding process. The preparation method of the copper-zirconium alloy wear-resistant coating based on laser cladding comprises the following steps: obtaining a copper-zirconium alloy matrix; preparing a CuSn film layer on the surface of the copper-zirconium alloy matrix, wherein the thickness of the CuSn film layer is 0.5-2 microns; preparing an iron-based coating on the surface of the CuSn film layer, wherein the thickness of the iron-based coating is 0.8-1.0 mm; preparing a wear-resistant layer on the surface of the iron-based coating, wherein the thickness of the wear-resistant layer is 1-1.2 mm; the material for preparing the wear-resistant layer is nickel-based alloy composite ceramic powder, and the nickel-based alloy composite ceramic powder comprises nickel-based alloy and ceramic powder.

The present invention discloses a transition metal carbonitride-SiC x N y Composite ceramics and a preparation method thereof, comprising: mixing MeSi2 powder and carbon powder and then ball-milling them uniformly, drying and further grinding them to obtain a fully mixed powder mixture; pressing the powder mixture into a ceramic body by a cold pressing process; subjecting the ceramic body to a high-temperature heat treatment in a nitrogen environment, and cooling the ceramic body to obtain a transition metal carbonitride-SiC x N y Composite ceramics. In the process of preparing transition metal carbonitride ceramics, SiC is generated simultaneously. x N y Compared with single-phase ceramics, due to the presence of the second phase, the sintering performance of multiphase ceramics has been greatly improved, and the strength and toughness have been improved. Silicon-based composite carbide ceramics also show better anti-ablation performance, realizing the wide temperature range and high temperature range application of transition metal carbonitrides.

The invention discloses a low-shrinkage porous mullite ceramic photocuring additive manufacturing method which comprises the following steps: firstly, mixing a base material containing aluminum and silicon elements with a villiaumite catalytic phase to prepare composite ceramic slurry, preparing a ceramic green body through a photocuring additive forming process, and then preparing the low-shrinkage porous mullite ceramic through a temperature-controlled thermal degreasing and in-situ gas phase method sintering process. The porous mullite ceramic with low shrinkage rate is prepared. By using the villiaumite catalytic phase material, the printability and stability of the ceramic slurry are maintained, the sintering temperature in the heat treatment stage is reduced, the low-size shrinkage performance is obtained, and large-scale efficient additive preparation of the porous mullite ceramic structural part is easy to realize.

The invention discloses a design optimization method of a silicon carbide composite ceramic preparation method, and belongs to the technical field of material calculation design of composite structural ceramics. A data set of a preparation method and a preparation method model are constructed; generating a prediction model for the silicon carbide composite ceramic prepared by the preparation method model by using a machine learning algorithm; optimizing the prediction model by using an improved whale algorithm; and taking the optimized prediction model as a fitness function, performing reverse optimization through a particle swarm multi-objective algorithm, solving global optimal process parameters, and outputting the silicon carbide multiphase ceramic preparation method with design optimization and the corresponding silicon carbide multiphase ceramic composition proportion. When the large-size special-shaped silicon carbide multiphase ceramic is prepared, components, processes and multiple performance indexes can be considered, collaborative optimization is realized, the preparation period is shortened to be 30% or below of that of a traditional method, and energy consumption and raw material waste are remarkably reduced while it is guaranteed that the performance of the silicon carbide multiphase ceramic material reaches the standard.

The invention discloses a full penetration joint composite liner for a closed small space and a welding method thereof. The composite material liner comprises a structural stress steel layer A, a composite ceramic layer B and an adhesive layer C for compounding the structural stress steel layer A and the composite ceramic layer B; the composite ceramic layer B faces the joint groove and can be provided with a groove / groove for controlling the shape of a molten pool and an air hole for exhausting gas and preventing a root air hole, and the side, away from the steel layer, of the composite ceramic layer B is provided with an acidic or alkaline welding powder layer G. The problems that a traditional metal gasket is prone to beading and incomplete penetration and a traditional ceramic gasket is prone to downwarping and difficult to assemble are solved, the welding seam forming is excellent, the mechanical property is good, and full penetration welding of closed small spaces such as a bridge steel anchor beam and a steel box beam support area is adapted.

The invention provides a thermal response glass ceramic repairing agent based on microcapsule packaging, a preparation method of the thermal response glass ceramic repairing agent, an application of the thermal response glass ceramic repairing agent in self-repairing of an SOFC electrolyte and a solid oxide fuel cell. The repairing agent comprises a nano-porous Al2O3 microcapsule and a glass ceramic repairing agent packaged in the nano-porous Al2O3 microcapsule, the glass ceramic repairing agent comprises a low-temperature flowing glass phase and an ionic conductive ceramic phase, when the electrolyte crack expands, the microcapsule is broken to release the repairing agent; the glass phase melts and flows at the running temperature of the SOFC to fill cracks, and then is crystallized to form MgAl2O4-CeO2 composite ceramic compatible with electrolyte, and a compact structure is recovered. Compared with the prior art, the repairing agent disclosed by the invention is compatible with an SOFC electrolyte material, can trigger repairing at an operating temperature, adopts a microcrack self-repairing technology which does not damage an electrode layer, can realize real-time repairing without shutdown, and can automatically trigger repairing after cracks are generated.

The invention provides an anti-oxidation and ablation-resistant ceramic coating on the surface of a C / C composite material and a preparation method, and belongs to the technical field of thermal protection coatings. The anti-oxidation and ablation-resistant ceramic coating on the surface of the C / C composite material comprises a bottom bonding layer, a middle heat insulation layer and an external ablation-resistant layer, the bottom bonding layer is SiC-SiCf, the middle heat insulation layer is modified ZrO2, and the external ablation-resistant layer is HfC-ZrC-SiCf. According to the method, the SiC-SiCf / modified ZrO2 / HfC-ZrC-SiCf composite ceramic coating is prepared on the special-shaped part through dipping and brushing methods, the method is easy and convenient to operate, few in material consumption and low in cost, and the performance meets the specific use requirement.

The invention provides a composite ceramic sand material as well as a preparation method and application thereof, and the composite ceramic sand material is prepared by taking zirconia-based ceramic as a core, compounding MoS lubricating particles on the surface and finally coating a SiO protective layer. The sand blasting effect of the ceramic sand is remarkably improved by combining the wear resistance of zirconium oxide, the lubricity of MoS and the chemical stability and sealing protection effect of SiO, the composite ceramic sand material shows revolutionary comprehensive performance advantages in the field of metal sand blasting, and the composite ceramic sand material is particularly suitable for scenes with the requirements for high precision, low damage and long service life.

The invention discloses a plasma protection composite coating with a nanostructure, the composite coating is a composite ceramic coating prepared on a substrate by adopting a vacuum cold spraying method, the thickness of the composite ceramic coating is 1-50 microns, the particle size is 10-200 nm, and the porosity is lt; the composite ceramic coating material is composed of yttrium oxide and a second ceramic component. The yttrium oxide and the second ceramic component are selected and compounded, the second ceramic powder accounting for 5-50% of the total mass of the powder is introduced into the yttrium oxide, the coating is prepared through the vacuum cold spraying method and then subjected to heat treatment, and the composite coating prepared through the method has excellent fluorine / chlorine plasma corrosion resistance; the density, the thermal shock resistance and the microscopic stability of the coating are remarkably improved through nano-grain refinement, and formation of particulate pollutants is effectively reduced; the vacuum cold spraying process is free of melting at low temperature, material structure deterioration is avoided, and meanwhile, the method meets the requirements of heat-sensitive substrates and high precision.

The invention belongs to the technical field of ceramic materials, and discloses a zirconia ceramic containing nanofiber alumina and stabilized by yttrium oxide, the zirconia ceramic contains 3 mol% of Y2O3, the concentration of nanofiber Al2O3 in the composite ceramic is 0.95 vol%-1.9 vol%, and the sintering temperature is 1400-1500 DEG C. The invention also discloses a preparation method of the zirconia ceramic. The low-temperature hydrothermal aging resistance of the yttria-stabilized zirconia ceramic can be greatly improved by adding a proper range of nano-fiber alumina; the addition of a proper range of nanofiber alumina has no significant influence on the rheological properties of the yttrium oxide-stabilized zirconia ceramic, and the void ratio of the pressed zirconia ceramic is not greatly different from that of the zirconia ceramic not added with the nanofiber alumina.

The invention discloses a preparation method of a wear-resistant coating of a piston rod, and aims to solve the problems of low bonding strength, high porosity, easiness in oxidation, large residual stress and the like of an existing coating. The method comprises the following steps: firstly, carrying out alkaline oil removal and sand blasting roughening pretreatment on a piston rod matrix, and carrying out sand blasting for 5-10 minutes by adopting aluminum oxide sand grains of 120-200 meshes under the pressure of 0.4-0.6 MPa; then NiCrMo alloy powder with the thickness of 15-45 microns is sprayed through high velocity oxy-fuel to form a bottom layer with the thickness of 80-120 microns, and the binding force of the coating and a base body is enhanced; then, WC-Co-Cr composite ceramic powder with the mass fraction of WC being 70%-85% is subjected to laser cladding, a wear-resisting layer of 300-500 microns is prepared, and argon at the speed of 10-15 L / min is synchronously introduced to prevent oxidation; finally, under the vacuum degree of 1 * 10 <-3 >-1 * 10 <-2 > Pa, the temperature is increased to 400-500 DEG C at the speed of 5-10 DEG C / min, heat preservation is conducted for 2-3 h Through gradient coating design and parameter synergy, the compactness of the coating exceeds 99%, the hardness reaches HV1200-1500, the bonding strength exceeds 70 MPa, compared with a traditional process, the wear-resistant life is prolonged by 3.2 times, the salt spray corrosion resistance exceeds 1500 hours, hexavalent chromium pollution is avoided, and the coating has remarkable industrial application value.

The invention discloses conductive silicon nitride composite ceramic and a preparation method and application thereof. The method for preparing the conductive silicon nitride composite ceramic comprises the following steps: performing surface oxidation treatment on first ceramic powder to obtain the first ceramic powder with an oxidation film layer; mixing the second ceramic powder with the first ceramic powder with the oxide film to obtain a mixture; carrying out heating treatment on the mixture under the condition of 1700 DEG C to 2500 DEG C so as to obtain a precursor; and sintering the precursor to obtain the conductive silicon nitride composite ceramic, wherein the first ceramic powder comprises alpha-Si3N4, the second ceramic powder comprises metal oxide ceramic, the oxidation film layer comprises silicon oxide, and the oxidation film layer has active sites; the volume conductivity of the conductive silicon nitride composite ceramic at room temperature is not lower than 1 * 10 < 2 > S / m, and the volume conductivity of the conductive silicon nitride composite ceramic at 1000 DEG C is not lower than 1 * 10 < 3 > S / m. The conductive silicon nitride composite ceramic prepared by the invention has excellent mechanical properties and high conductivity.

The invention discloses a nano-structure composite ceramic coating resistant to plasma etching and a preparation method thereof, and belongs to the technical field of surface protection in the semiconductor device manufacturing process, the composite ceramic coating comprises a priming layer and a surface protection layer which are sequentially deposited on a substrate by adopting a vacuum cold spraying method, the priming layer is made of oxide ceramic, and the surface protection layer is made of silicon oxide. The surface protection layer is made of high-stability rare earth ceramic, the thickness of the bottom layer is 0.2-20 microns, the grain size of the bottom layer is 10-200 nm, the thickness of the surface protection layer is 1-10 microns, and the grain size of the surface protection layer is 10-50 nm. According to the method, the oxide ceramic coating is manufactured on the surface of the substrate through a vacuum cold spraying method to serve as a base coat and then is subjected to heat treatment, so that it is guaranteed that the coating has high binding force, the subsequent coating is prevented from falling off, and when high-stability rare earth ceramic is manufactured, powder with the small powder particle size is selected for manufacturing; therefore, the coating is ensured to have certain etching resistance.

The invention relates to a method for efficiently synthesizing a lithium difluoro bis (oxalate) phosphate solid in a continuous flow reactor, and belongs to the field of environmental protection. The method comprises the following steps: firstly, feeding a lithium hexafluorophosphate solution and a lithium oxalate solution into a static mixing module of a continuous flow reactor for mixing; then entering a reaction module of the continuous flow reactor for reaction; after the reaction is finished, the material enters a separation module of a continuous flow reactor, and after membrane separation, crude lithium difluorobisoxalato phosphate is obtained through a modified ceramic membrane adsorbent; washing the crude lithium difluoro-bis (oxalate) phosphate with absolute ethyl alcohol, and performing vacuum drying to obtain a lithium difluoro-bis (oxalate) phosphate solid; the modified ceramic membrane adsorbent is prepared from an aluminum oxide-zirconium oxide composite ceramic membrane, DMF (Dimethyl Formamide), water, isocyanate 1-trimethoxysilyl methyl ester, 3, 5-dihydroxyphenylboronic acid and stannous octoate. The lithium difluoro-bis (oxalate) phosphate prepared by the method is high in purity and high in yield, and meets the requirements of high-end lithium batteries.

The invention discloses an infrared transparent ceramic material with a wide transmission wave band and a preparation method of the infrared transparent ceramic material, and belongs to the field of inorganic ceramic materials. The chemical formula of the infrared transparent ceramic material is (Y < 1-x >, Re < x >) 2O3-(Mg < 1-y > Re < y >) O, and x is more than 0 and less than 4%; 0 < y < 30%; re is one of Zn < 2 + >, Mn < 2 + > and Ni < 2 + >; the preparation method of the infrared transparent ceramic material comprises the following steps: firstly, preparing primary Y2O3-(Mg1-yRey) O powder; placing the powder and a binder in a ball milling tank, adding a solution of a compound of Re < 2 + > with the molar percentage of x, and carrying out ball milling to obtain slurry; drying, crushing, sieving and calcining the slurry to obtain (Y < 1-x >, Re < x >) 2O3-(Mg < 1-y > Re < y >) O powder; the preparation method comprises the following steps: performing equiaxial bidirectional pressure forming on Y2O3 nano powder, then adding (Y < 1-x >, Re < x >) 2O3-(Mg < 1-y > Re < y >) O powder for forming, and then adding Y2O3 nano powder for forming to obtain a ceramic biscuit with a composite structure; and performing double-sided laser sintering on the ceramic biscuit, removing Y2O3 on the upper surface layer and the lower surface layer, and performing double-sided polishing treatment to obtain the infrared transparent ceramic material. The biscuit composite structure design and the laser sintering technology are adopted, the oxygen vacancy defect generated by traditional sintering can be effectively avoided, therefore, an air annealing technology is not needed, and meanwhile the problems that the valence state of Re < 2 + > is unstable and oxidation is prone to occurring are effectively avoided. The densification of the multiphase ceramic is realized in an extremely short time by laser sintering, the grain size is effectively inhibited, the grain scattering is avoided, and the near-infrared transmittance of the ceramic is improved.

The invention discloses a 3D printing photocuring forming method for a silicon nitride ceramic framework, and belongs to the technical field of advanced ceramic additive manufacturing. According to the 3D printing photocuring forming method for the silicon nitride ceramic framework, the silicon nitride framework containing a communicating hole array and a special-shaped supporting structure can be prepared through the DLP photocuring technology and customized slurry, the efficient infiltration requirement of a multiphase ceramic matrix is met, and the manufacturing efficiency is improved. The powder dispersity is improved through modification of a silane coupling agent, resin residues are thoroughly removed through cooperative control of a low-shrinkage resin system, segmented exposure, gradient degreasing and sintering, interface reaction with a complex-phase matrix at high temperature is avoided, stable complex-phase performance is guaranteed, layering does not exist after standing is conducted for 24 h through customized slurry, the process stability is extremely high, and the method is suitable for industrial production. Therefore, the problems of single skeleton structure, low dimensional precision and high impurity content in the prior art are solved, a complex three-dimensional pore structure can be prepared, the process stability is high, and the method is suitable for batch production and meets the requirements of multiple scenes such as high-temperature structural parts and multiphase ceramic reinforcement bodies.

The invention discloses a steel gas cylinder plate-type bottom collecting machine, and relates to the technical field of bottom collecting machines, the steel gas cylinder plate-type bottom collecting machine comprises a steel cylinder clamping machine, a waste box and a mounting shell, a steel cylinder main body is mounted in the steel cylinder clamping machine, a bottom collecting assembly and a scraper assembly are mounted on the side surface of the mounting shell, and the scraper assembly is correspondingly arranged below the bottom collecting assembly; the bottom collecting assembly comprises a servo motor fixedly mounted on the side face of the mounting shell, a first rotating column is rotationally connected to the interior of the mounting shell, a first rotating rod is fixedly connected to the side face of the first rotating column and extends to the side face of the mounting shell, and a bottom collecting mold is fixedly connected to the end of the first rotating rod and is made of 45 steel; according to the steel gas cylinder plate-type bottom closing machine, the bottom closing mold adopts the inlaid composite ceramic modules, so that the bottom closing machine can be used on two sides and is easy to replace, the service life is remarkably prolonged, the replacement frequency is reduced compared with that of traditional surfacing welding, and the steel gas cylinder plate-type bottom closing machine has the properties of shock resistance, crack resistance, high temperature resistance and wear resistance.

The zirconium oxide ceramic modified by the graphene / zirconium oxide calcined composite microspheres is prepared from stable zirconium oxide powder A and the graphene / zirconium oxide calcined composite microspheres accounting for 25 wt% or below of the total ceramic powder through mixing, compression molding and sintering, the preparation method of the graphene / zirconium oxide calcined composite microspheres comprises the following steps: preparing stable zirconium oxide powder B, graphene and a solvent into slurry; and carrying out ball milling, spray drying and calcination to obtain the graphene / zirconium oxide calcined composite microspheres. According to the present invention, the graphene / zirconium oxide calcination composite microsphere and the SPS sintering are performed, such that the dispersed graphene / zirconium oxide two-phase structure region exists in the obtained zirconium oxide composite ceramic so as to consume the large amount of the crack growth energy, and the significant toughening effect is provided.

The present application relates to a kind of high-temperature-resistant inductive angle sensor, belong to angle sensor technical field.The sensor includes: gradient composite ceramic substrate Al2O3-ZrO2-Al2O3, realize thermal expansion coefficient gradient matching by intermediate layer zirconium oxide doped yttrium oxide, reduce thermal stress cracking risk;Substrate surface is formed with micro-arc oxidation porous layer in turn titanium nitride nanocrystalline layer, improve surface bonding force;Atomic layer deposition process is used to prepare TiN or TiN / Ag composite film coil, improve temperature resistance;Through electron beam welding and transient liquid phase bonding composite process coil and circuit;Insulating encapsulation layer is made of boron nitride nanosheet and high-temperature-resistant resin, improve thermal conductivity and breakdown field strength.The present application is through gradient substrate design, thin film coil integration and composite process optimization, solves the thermal stress failure of traditional inductive sensor under high temperature, coil oxidation and insulation aging problem, suitable for angle measurement under extreme environment.

The application discloses a kind of high-temperature-resistant impact-resistant heat-absorbing heat-insulating composite ceramic brick and its preparation method and application, the ceramic composite brick includes heat-insulating layer and heat-absorbing layer;The main component of the heat-insulating layer is vacuum nanometer heat-insulating ceramic particles and alloy metal particles containing one or more of tungsten, cobalt, molybdenum or vanadium elements;The main component of the heat-absorbing layer is 3N grade and above high-purity alumina and black pigment;The components of the heat-insulating layer and the heat-absorbing layer are filled in the same mold in sections, and then are pressed to form a composite.The heat-insulating layer not only has excellent heat-insulating performance, but also has good toughness and impact resistance;The heat-absorbing layer can quickly absorb heat and accumulate heat, the temperature rising speed in the furnace is increased by more than 30%, the set temperature is quickly reached, the heat-insulating performance is increased by more than 2 times, and has good practical value and important energy-saving and environmental protection social value.

The invention discloses a three-dimensional graphene-carbon fiber network and double-phase high-entropy alloy synergistic strengthening and toughening ceramic cutter material as well as a preparation method and application thereof. The material is prepared from the following components in parts by mass: 87.8 to 90.9 parts of aluminum oxide, 8 to 10 parts of AlCoCrFeNi five-element equal-atomic-ratio high-entropy alloy, 1 to 2 parts of carbon fiber and 0.1 to 0.2 part of graphene. The preparation method comprises the steps of preparation of graphene grafted carbon fibers, preparation of AlCoCrFeNi high-entropy alloy powder, preparation of aluminum oxide-high-entropy alloy-graphene grafted carbon fiber composite ceramic powder and spark plasma sintering. The ceramic cutting tool material is used for preparing high-speed cutting tools. According to the preparation method, a plastic toughening mechanism of a double-phase high-entropy alloy is organically combined with a multi-stage toughening effect of a three-dimensional graphene-carbon fiber network, and a composite ceramic material with high hardness and high fracture toughness is obtained through spark plasma sintering, so that the adaptability of a cutter under a high-speed cutting condition is remarkably improved, and the service life of the cutter under the high-speed cutting condition is remarkably prolonged.