445 results about "Oxide ceramic" patented technology

The invention relates to the technical field of non-oxide ceramic-based composite materials, in particular to Fe-N-based high-entropy nitride ceramic as well as a preparation method and application thereof. The method comprises the following steps: by taking iron powder as a sintering aid, mixing (Hf < 0.2 > Zr < 0.2 > Ti < 0.2 > Nb < 0.2 > Ta < 0.2 >) N high-entropy powder with the iron powder, and carrying out ball milling treatment to obtain ball-milled powder; and under the oxygen-free condition, the ball-milled powder is subjected to sintering treatment, transformation from the loose ball-milled powder to compact and uniform solid solution ceramic is achieved in the sintering treatment process, and the Fe-N-based high-entropy nitride ceramic is obtained. According to the method, a nitride thermal reduction method sintering process is adopted, energy is provided for densification of the Fe-N-based high-entropy nitride ceramic by utilizing reaction heat release of the (Hf0. 2Zr0. 2Ti0. 2Nb0. 2Ta0. 2) N high-entropy powder and the iron powder, the sintering temperature is reduced, energy is saved, and the defect that densification needs to be carried out under a high-temperature condition in the prior art is overcome.

The invention provides modified zirconium silicate whisker reinforced aluminum oxide ceramic as well as a preparation method and application thereof, and belongs to the technical field of new materials. The preparation method comprises the following steps: modifying the surface of alumina powder with a silane coupling agent with sulfydryl to generate zirconium silicate in situ, uniformly mixing the zirconium silicate with zirconium silicate whiskers which are treated by hydrogen peroxide and modified by phytic acid and tannic acid and a CeO2-Y2O3-MgO-SiO2 compound, and performing spark plasma sintering to obtain the modified zirconium silicate whisker reinforced alumina ceramic. The modified zirconium silicate whisker reinforced aluminum oxide ceramic prepared by the invention has better interface bonding force, excellent mechanical properties and good wear resistance, realizes ceramic densification, and has wide application prospects.

The invention relates to the technical field of nuclear fusion surface plasma W materials, in particular to nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder, a composite material and a preparation method of the nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder. The composite powder is of a nearly spherical core-shell hierarchical structure, and the particle size is 30-50 nm; according to the composite powder, refractory metal W serves as a matrix, nano rare earth oxide ceramic particles are evenly dispersed in matrix W crystal grains, Ti mainly forms an enrichment area on the surface of the matrix or a matrix / rare earth oxide interface in a simple substance or oxide mode, the phase interface structure is effectively improved, W crystal boundary migration and dislocation motion are hindered, W crystal grains are remarkably refined, and the composite powder is prepared. Part and W form semi-coherence, fine grain and interface strengthening and toughening are achieved, and a brand new thought and a technical method are provided for synergistically improving the strength and toughness of the W composite material. The composite powder is subjected to organic reduction synthesis and low-temperature reinforced sintering to prepare the composite material, the tensile strength at the room temperature reaches 500-610 MPa, and the ductility is 5%-8%.

The invention belongs to the technical field of ceramic material preparation, and particularly relates to a high-throughput preparation method and device based on an aluminum oxide ceramic system diffusion couple. An aluminum oxide model green body containing a plurality of blind holes is prepared through the powder extrusion 3D printing technology, a diffusion material is embedded through a rivet type structure, and the layering risk is eliminated in combination with the thermal expansion coefficient gradient design (the inner layer is large, and the outer layer is small); sPS low-temperature rapid sintering is adopted, and multiple binary diffusion couples are prepared at a time. According to the method, the problems that a traditional diffusion couple is not tight in contact, easy to layer and incapable of being produced in batches are solved, the efficiency is improved by 80% or above, diffusion couple samples of different materials can be prepared at the same time, multiple binary diffusion couple systems can be obtained through subsequent sample cutting, and the preparation method is simple, efficient, easy to operate and suitable for aluminum oxide and rare earth oxide systems.

The invention discloses an aluminum oxide ceramic tube shell production device and a preparation method, and belongs to the technical field of aluminum oxide ceramic tube shell preparation, the technical scheme is that the aluminum oxide ceramic tube shell production device comprises a forming mechanism, a transferring mechanism, a sintering mechanism and a surface treatment mechanism, the transferring mechanism is used for transferring the formed aluminum oxide ceramic tube shell to the sintering mechanism, the sintering mechanism is used for sintering the formed aluminum oxide ceramic tube shell, and the surface treatment is used for carrying out surface treatment on the sintered aluminum oxide ceramic tube shell. According to the scheme, the adjacent aluminum oxide ceramic tube shells can be uniformly heated, the product quality is ensured, the uniform heating time of the single aluminum oxide ceramic tube shell can be prolonged, repeated sintering is not needed, and the preparation efficiency is improved.

The present invention discloses a triaxially spun superelastic and high-temperature resistant composite carbon nanofiber aerogel and a preparation method thereof. The aerogel is formed by interweaving curly fibers with a core layer of carbon and a shell layer of oxide ceramic. The present invention utilizes electrostatic spinning technology to prepare composite carbon nanofiber aerogels. First, an inner layer polyacrylonitrile solution is prepared, and the water / alcohol ratio is adjusted to prepare a middle layer ceramic sol with controllable water content, thereby obtaining a spinning solution with compatibility in the initial spinning stage. The temperature and humidity of the airflow of the outer nozzle are then regulated, and the water content of the ceramic sol is further adjusted during the spinning process, so that the spinning solution becomes incompatible. The spinning solution jet is fast and solidified in advance, thereby obtaining a curly interwoven structure nanofiber aerogel precursor. Finally, the final product is obtained by changing the atmosphere and performing rapid and continuous heat treatment. The present invention solves the problems of insufficient mechanical properties and easy oxidation of carbon nanofiber aerogels. The preparation method is simple and easy to implement, and the process is continuous, and can be carried out on existing electrostatic spinning production equipment.

The invention relates to the technical field of ceramic manufacturing processes, and particularly discloses a preparation method of a 96 aluminum oxide ceramic substrate, which comprises the following steps: slurry preparation: carrying out ball milling treatment on high-purity aluminum oxide powder, a sintering aid, a binder, a plasticizer, an organic solvent and a dispersing agent, and fully mixing to obtain tape casting slurry; forming a green body, coating a carrier film with the tape casting slurry through a tape casting machine with a wet film which is uniform in thickness and flat in surface, and drying the carrier film through a drying box in a partitioned manner to obtain a cured green body; and sintering densification treatment: carrying out glue removal treatment on the green body, and carrying out stepped heating sintering to obtain the 96 aluminum oxide ceramic substrate. According to the 96 aluminum oxide ceramic substrate prepared by the scheme, a large number of uniform crystal cores can be formed, small crystal grains can be dissolved, large crystal grains grow at a constant speed, and the uniformity of the crystal grain size is ensured, so that scattering of phonons on a crystal boundary can be reduced, and a structural foundation is laid for improvement of heat conductivity.

The invention discloses a preparation method of high-density aluminum oxide ceramic and the high-density aluminum oxide ceramic, and the preparation method comprises the following steps: adding a silane coupling agent ethanol solution into alpha-Al2O3 powder for modification treatment to obtain modified powder; the modified powder is subjected to doping treatment, doped powder is obtained, and the mass percent of the modified powder in the doped powder is larger than 97.5%; the method comprises the following steps: filling doped powder in a preset range of a key area of a graphite mold, filling pure modified powder on the outer layer of the doped powder, and wrapping carbon felt after pre-pressing and compacting to obtain a pre-pressed sample; the pre-pressed sample is put into a rapid hot-pressing sintering furnace, O2 / Ar mixed atmosphere is introduced, the temperature is gradually increased to a first sintering temperature, and meanwhile, the pressure applied to the mold is gradually increased to the sintering pressure according to the temperature increasing progress; keeping the temperature for a period of time at the first sintering temperature and the sintering pressure; after heat preservation is finished, the sintering pressure is kept, the temperature is reduced to a second sintering temperature, natural cooling is conducted to the room temperature, and the target high-density aluminum oxide ceramic is obtained.

The invention discloses a preparation method of a high-strength aluminum oxide ceramic substrate, which comprises the following steps: firstly, modifying aluminum oxide powder by a liquid phase method, and coating a layer of nano magnesium oxide on the surface of the aluminum oxide powder; then carrying out ball milling treatment on the modified powder, rare earth metal oxide, metal oxide, an organic solvent, a binder, a plasticizer and a dispersing agent together, then carrying out defoaming, tape casting, drying and laminated hot pressing to obtain a ceramic green body, and finally carrying out sintering molding in an air atmosphere to obtain the ceramic. The nano magnesium oxide active coating layer constructed in situ and the added exogenous sintering aid act together, so that uniform growth of isometric crystals is promoted, development of a small amount of dominant oriented grains is directionally induced, a composite enhanced microstructure is formed, atomic scale super-uniform distribution and optimal interface combination of the nano magnesium oxide and the exogenous sintering aid are realized, and the nano magnesium oxide / exogenous sintering aid composite material is prepared. The bending strength of the obtained alumina ceramic can reach up to 881 MPa.

The invention discloses a high-corrosion-resistance yttrium oxide coating for semiconductor equipment and a preparation method of the high-corrosion-resistance yttrium oxide coating, and belongs to the technical field of coatings. According to the high-corrosion-resistance yttrium oxide coating for the semiconductor equipment and the preparation method of the high-corrosion-resistance yttrium oxide coating, a SiC transition layer is formed on the surface of a carbon-containing matrix; and an yttrium oxide ceramic coating is deposited on the SiC transition layer in an SPPS plasma spraying mode. The SiC transition layer is firstly formed on the carbon-containing substrate, then the Y2O3 coating is deposited through solution precursor plasma spraying, and a structure with both interface stability and surface protection is formed. SiC is thermally compatible with a substrate, so that undercut, warping and stripping can be inhibited; the dense Y2O3 layer can form a non-volatile protective phase in fluorine-containing / chlorine-containing plasma, thereby reducing the material removal rate and reducing particle release.

The invention relates to the technical field of surface strengthening treatment and coating preparation, in particular to a micro-arc oxidation electrolyte, a preparation method of the micro-arc oxidation electrolyte and a preparation method of an oxide ceramic coating on the surface of a magnesium-copper dissimilar metal material component. The invention provides a micro-arc oxidation electrolyte. The micro-arc oxidation electrolyte comprises a main film-forming agent, an arcing aid, a pH regulator, a corrosion inhibitor and water, the main film-forming agent comprises ammonium fluozirconate and / or potassium fluozirconate; the arcing aid comprises one or more of disodium hydrogen phosphate, sodium dihydrogen phosphate, ammonium dihydrogen phosphate and diammonium hydrogen phosphate; the corrosion inhibitor comprises one or more of hexamethylenetetramine, ammonium bifluoride and triethanolamine. The micro-arc oxidation electrolyte breaks through the problem that valve metal and non-valve metal cannot be subjected to arc discharge at the same time for micro-arc oxidation treatment in the micro-arc oxidation process.

The invention provides porous alumina ceramic and a preparation method thereof, and relates to the technical field of ceramic materials. The invention relates to a preparation method of porous alumina ceramic. The preparation method comprises the following steps: dispersing alpha-cellulose powder in deionized water to form a cellulose suspension; stirring to fully swell the cellulose and form uniform gel, and freeze-drying to obtain a template; dissolving aluminum nitrate hexahydrate, magnesium nitrate hexahydrate and yttrium nitrate hexahydrate in absolute ethyl alcohol to obtain a precursor solution; putting gamma-Al2O3 micro powder and ammonium fluoride into a ball milling tank, adding the precursor solution and a dispersing agent, adding zirconium oxide balls and absolute ethyl alcohol into the ball milling tank, and performing ball milling to obtain ceramic slurry; dipping a template into the ceramic slurry, and performing dipping treatment under a vacuum condition to form a composite green body; and sintering to obtain the porous alumina ceramic. According to the porous aluminum oxide ceramic, the process stability is improved, and the problem that the strength is sharply reduced when the porosity is too high is solved.

The invention discloses a method for preparing oxide eutectic ceramics in an ultrafast high-temperature furnace. Proportioning the raw material powder according to the eutectic components, and sequentially carrying out ball milling, drying, sieving and compression molding; putting the green body into a thin-wall graphite crucible, and putting the thin-wall graphite crucible into an interlayer hole of a heating carbon felt element; and heating to a set temperature in an ultrafast manner, keeping the temperature for an extremely short time, and cooling to obtain the oxide eutectic ceramic. According to the method, the eutectic structure of the oxide ceramic is rapidly formed by adopting ultrafast heating and Joule heat radiation heating at the furnace temperature far lower than the eutectic temperature, and the structure morphology of the eutectic ceramic can be regulated and controlled by adjusting temperature parameters. The obtained eutectic structure is fine in size and excellent in mechanical property; the problems that an existing oxide eutectic ceramic preparation method is long in consumed time, high in cost, complex in bulk material preparation process and the like are solved.

The invention belongs to the technical field of medium-entropy ceramic materials, and relates to a preparation method of a yttrium-zirconium-cerium ternary medium-entropy oxide ceramic material, which comprises the following steps: weighing Y2O3 powder, ZrO2 powder and Ce02 powder according to a molar ratio of 1: 2: 2, carrying out ball-milling mixing to obtain mixed powder, drying the mixed powder, prepressing into a blank, carrying out microwave sintering, and carrying out sintering to obtain the yttrium-zirconium-cerium ternary medium-entropy oxide ceramic material. Synthesizing a yttrium-zirconium-cerium ternary medium-entropy oxide (Y1 / 3Zr1 / 3Ce1 / 3) O2 ceramic material with an equal molar ratio; according to the invention, the raw materials are simple, the preparation steps are simple, the production efficiency is high, the microwave sintering technology is low in sintering temperature and short in sintering time, microwave is utilized to reduce activation energy of substances to accelerate sintering and generate uniform fine grains, and internal pores of the fine grains are small and round, so that the sintered material has good stability and reprocessability; according to the process, green and continuous production is easy to realize, the production scale and efficiency are further improved, and a new way and thought are provided for industrial microwave sintering preparation of the medium-entropy oxide ceramic material.

The invention belongs to the technical field of aluminum electrolysis, and relates to preparation and application of a metal ceramic inert anode material for aluminum electrolysis. The material for the metal ceramic inert anode is formed by compounding a high-entropy alloy phase and a ceramic phase; according to the preparation method disclosed by the invention, the AlCrFeNiV high-entropy alloy and the NiFe2O4 spinel ceramic are compounded to prepare the metal oxide ceramic. The manufacturing method of the metal ceramic inert anode is easy to operate, efficient and beneficial to application and popularization. And in an electrolytic test with the electrolyte being a cryolite-aluminum oxide system at 960 DEG C, good high-temperature conductivity, electrochemical stability, corrosion resistance and thermal shock resistance are achieved.

The invention discloses a one-dimensional heat flux density measuring device based on the Fourier law, and relates to the technical field of object heat flux density measurement. Comprising a heating unit, a sealing heat insulation unit, a cooling unit, a temperature acquisition unit and a data processing unit. The sealing heat insulation unit comprises a heat insulation material, an aluminum oxide ceramic tube, a sealing air layer, an outer layer supporting plate and a rubber or silica gel sealing ring. The heating unit comprises a high-temperature copper plate heating platform; the cooling unit comprises a water cooling head, a cooling water jacket and a cooling water tank, and is nested at the top of the sealed heat insulation unit; according to the temperature acquisition unit, a thermocouple is attached to the surface of a measured object and is connected with an external thermodetector; the data processing unit comprises an acquisition terminal and a computer, the acquisition terminal is connected with a USB interface of the computer and a USB interface of the thermodetector, and data acquired by the thermodetector is transmitted to the computer. The invention provides the heat flux density measuring device which is simple and convenient to assemble, low in construction cost and simple and convenient to calculate, and the measuring efficiency is improved.

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 the technical field of ceramic materials, in particular to a preparation method of a low-temperature sintered high-thermal-conductivity 99 ceramic aluminum oxide ceramic substrate, which comprises the following steps of: 1, preparing slurry; step 2, tape casting; step 3, stamping and forming; 4, performing warm isostatic pressing treatment; step 5, performing main firing to obtain porcelain; and 6, inspecting a finished product. By regulating the particle size of the alumina powder, adopting the specific sintering aid of the solid solution and the liquid phase forming agent, introducing trace La2O3 into the system and combining low-temperature co-firing, the problem that the 99 ceramic alumina ceramic substrate is easy to crack in the processing process is improved while the sintering temperature of the 99 ceramic alumina ceramic substrate is remarkably reduced.

The utility model discloses a titanium alloy product sintering device capable of reducing sintering friction, which belongs to the technical field of titanium alloy processing and comprises a mounting base, a conveying device for transportation is mounted on the mounting base, and a plurality of groups of oxide ceramic plates for placing titanium alloy green bodies are arranged on the conveying device. A first mounting frame is mounted on the conveying device, a discharging assembly used for discharging and scraping off sintering powder on the oxide ceramic plate is mounted on the conveying device, and a continuous vacuum sintering furnace is fixedly connected to the upper end of the first mounting frame. Through the mode, the sintering material is sprayed between the contact surfaces of the oxide ceramic plate and the titanium alloy green body through the spraying equipment, so that the friction between the titanium alloy green body and the oxide ceramic plate during sintering can be effectively reduced; cleaning of the oxide ceramic plate, stripping of sintered products and continuous sintering treatment are achieved, and the production efficiency is improved.

The invention relates to the technical field of metal surface protective coatings, in particular to a corrosion-resistant coating for a building aluminum template and a preparation method of the corrosion-resistant coating. The problems that a coating is prone to failure under the stress-corrosion synergistic effect, and the protection service life is short are solved. The coating comprises an organic silicon hybrid bottom layer, a dual-carrier corrosion inhibitor energy storage layer, a microcapsule self-repairing layer and a wear-resistant super-hydrophobic top layer. An oxidized ceramic layer is generated on the surface through micro-arc oxidation, and then a bottom layer is formed through dip-coating of organic silicon hybrid sol and curing; dispersing the porous silicon dioxide microspheres loaded with the corrosion inhibitor and layered double hydroxides in water-based resin to prepare an energy storage coating, and forming a corrosion inhibition energy storage layer; urea resin microcapsules and gelatin-Arabic gum microcapsules are added into a resin matrix to prepare a self-repairing coating, and a self-repairing layer is formed; and finally, mixing the fluorosilane-modified nano aluminum oxide and nano silicon dioxide with wear-resistant organic silicon resin to form a super-hydrophobic top layer.

The invention relates to the technical field of ceramic substrates, in particular to a preparation method of an aluminum oxide ceramic substrate, which comprises the following steps: step 1, mixing and refining aluminum oxide powder and a fluxing agent to obtain mixed powder, the aluminum oxide powder comprising first aluminum oxide powder and second aluminum oxide powder; 2, adding the mixed powder, a binder, a plasticizer, a sintering aid and a dispersing agent into a mixed solvent, uniformly mixing, carrying out ball milling treatment, and then sufficiently defoaming and aging to obtain slurry; 3, uniformly coating a PET film with the slurry, and then carrying out three-stage drying to obtain a blank belt; 4, the blank strip is subjected to rolling and die punching in sequence, and a blank sheet is obtained; and step 5, sintering the blank piece at 1500-1550 DEG C to obtain the ceramic substrate. Two kinds of aluminum oxide powder with different particle sizes are used, and the sintering aid Y2O3 is added, so that the mechanical property of the ceramic substrate with the aluminum oxide content of 98% is improved while the sintering temperature is reduced.

The invention provides an aluminum oxide ceramic-based wave-absorbing material and a preparation method thereof, and belongs to the field of ceramic-based composite materials. The method comprises the following steps: mixing a resin monomer, a light curing agent, aluminum oxide powder, a dispersing agent, a rheological additive and a sintering additive to obtain aluminum oxide ceramic slurry; according to preset ceramic structure model data, the aluminum oxide ceramic slurry is subjected to photocuring 3D printing, and an aluminum oxide ceramic biscuit is obtained; degreasing and sintering the alumina ceramic biscuit to obtain an alumina ceramic matrix; and loading the wave-absorbing agent on an aluminum oxide ceramic matrix to obtain the aluminum oxide ceramic-based wave-absorbing material. The alumina ceramic-based wave-absorbing material has the characteristics of complex and adjustable structure, light weight, high precision, high mechanical strength, high melting point, broadband absorption and the like. The working temperature of a part made of the composite material can reach 900 DEG C or above, and the composite material can resist severe environments such as high-speed airflow scouring, oxidation and gas corrosion and can be used as a light-weight bearing part to be applied to invisible equipment.

The invention discloses a preparation method of a zirconium oxide toughened aluminum oxide ceramic substrate, which comprises the following steps: respectively carrying out surface modification on aluminum oxide powder and zirconium oxide powder by adopting a coupling agent, a catalyst and a cross-linking agent, then mixing the two modified powder with a rare earth sintering aid, a dispersing agent, a binder and a plasticizer, and carrying out ball milling treatment, thereby obtaining the zirconium oxide toughened aluminum oxide ceramic substrate. Carrying out tape casting and sintering processes to obtain a target ceramic substrate; the preparation method is simple, the process is easy to control, the bending strength of the prepared zirconium oxide toughened aluminum oxide ceramic substrate can reach 847 MPa at most, and the fracture toughness can reach 7.6 MPa.m < 1 / 2 > at most.

The utility model discloses a multi-petal elastic grinding wheel for grinding and repairing an outer chamfer of an aluminum oxide porcelain tube, which belongs to the technical field of aluminum oxide porcelain shell processing and comprises a grinding wheel base body. One end of the grinding wheel base body is connected with a chamfering machine power rotating shaft, and the other end is provided with a plurality of grinding wheel strips through fixing pieces. The grinding wheel strips are of a bowl-shaped structure and tend to expand from one side of the grinding wheel base body to the other side of the grinding wheel base body. When the ellipse shape of the end face of a product is irregular, the side edges of the end face make contact with the split elastic grinding wheel strips at the corresponding positions respectively and generate corresponding deformation, grinding and repairing of the outer chamfer of the oval aluminum oxide ceramic tube are achieved, and the multi-petal grinding wheel diamond grinding strips can effectively make contact with the outer edges of the ceramic tube no matter the diameter of the aluminum oxide ceramic tube and the ellipticity of the end face. And the outer chamfer of the end face is ground, so that the uniformity and consistency of the outer chamfer processing of the end face of the elliptical aluminum oxide porcelain tube are fully ensured.

The application relates to a dual-phase mosaic middle-entropy oxide anti-ablation ceramic and a preparation method thereof, and belongs to the technical field of ceramic materials. The method comprises the following steps: firstly, high-temperature heat treatment is adopted to prepare dual-phase middle-entropy oxide ceramic powders ((Hf, Zr, Ti)O2 and (Hf, Zr)TiO4) with different proportions; and then, a composite-phase mosaic structure ceramic is prepared by means of pressureless sintering. The method not only provides a theoretical basis for optimal anti-cyclic ablation performance component design of Hf-Zr-Ti-based multicomponent ultrahigh-temperature ceramic, but also lays a material foundation for the application of the prepared ceramic powder in substrate modification and coating preparation in the future. In addition, the pressureless sintering preparation of the dual-phase mosaic middle-entropy oxide anti-ablation ceramic block can realize low-cost and large-scale production. The process can not only realize low-cost and large-scale production, but also obtain uniformly distributed dual-phase middle-entropy oxides, fully exert the mutual synergistic effect among multicomponent oxides, and simultaneously improve the resistance to cyclic thermal shock and the anti-ablation performance of the ceramic block.

The invention relates to the field of light-emitting devices, and discloses an LED light-emitting device and a manufacturing method thereof, and the LED light-emitting device comprises a composite substrate which comprises an aluminum oxide ceramic substrate and an aluminum nitride ceramic block body; the aluminum oxide ceramic substrate is provided with a hollow area, and the aluminum nitride ceramic block is located in the hollow area; the LED chip is fixed on the upper surface of the aluminum nitride ceramic block body; the box dam is fixed on the upper surface of the composite substrate, the inner surface, facing the LED chip, of the box dam is an inclined surface, and the inclined surface inclines towards the center far away from the composite substrate; all the LED chips are located in the range of the box dam; a first reflective layer on the inclined surface; and the packaging colloid is used for packaging the LED chip. By designing the composite substrate and the box dam with the inner surface being the inclined surface, the lighting effect and the light spot quality of the LED light-emitting device can be improved, and meanwhile the edge yellowing phenomenon is eliminated.

The invention discloses a gradient composite reinforced anti-corrosion treatment method for a metal alloy guardrail, and belongs to the technical field of metal material surface treatment. The method comprises the following steps: carrying out ultrasonic cavitation micro-etching and electrochemical gradient activation pretreatment on the surface of a substrate; a metal ceramic composite layer containing a non-oxide ceramic reinforced phase is generated on the surface in situ through a micro-arc oxidation-chemical vapor deposition coupling process, and a component transition layer is formed with the assistance of vacuum gradient diffusion alloying treatment; and finally, coating an intelligent resin coating containing a corrosion inhibitor capsule and a corrosion indicator, and constructing a super-hydrophobic surface. By constructing a multi-layer composite protection system of the gradient diffusion layer / the metal ceramic layer / the intelligent coating / the super-hydrophobic layer, the anti-corrosion performance is remarkably improved, and the obtained guardrail has excellent bonding strength, wear resistance and long-acting anti-corrosion service life, has the intelligent functions of damage self-repairing and corrosion state visualization and is suitable for popularization and application. The method is especially suitable for harsh service environments.

The application discloses a kind of preparation methods of multi-component photocuring composite ceramic, by adding tetraethyl orthosilicate in multi-component ceramic powder, obtain modified ceramic powder, then it is mixed with photosensitive resin prepolymer, dispersing agent, diluent, photo initiator uniformly, subsequently sequentially through DLP photocuring 3D printing, debinding, sintering after obtaining composite ceramic.The application utilizes the hydrolysis condensation characteristics of tetraethyl orthosilicate, makes it react on the surface of different ceramic powder, uniformly coats silica layer, can improve the phenomenon of curing uneven caused by the difference of refractive index, absorbance and reaction sensitivity of powder;The layer has low refractive index, can also solve the problem of insufficient curing depth of non-oxide ceramic.In addition, during sintering, the silica layer forms Y-Ce-Si-O ternary eutectic system with CeO2 and Y2O3, reduces the initial temperature of liquid phase, further promotes sintering densification, provides a feasible scheme for composite ceramic, high-entropy ceramic 3D printing.

A solid-state battery including: a battery element; an exterior portion on an outer surface of the battery element; an external electrode in contact with the exterior portion; and Bi between the exterior portion and the external electrode, in which the exterior portion includes an oxide ceramic containing: Li; Mg; and one or more elements (M) selected from the group consisting of Group 4 and Group 5 elements.