2371 results about "Ceramic" patented technology

The application provides a microcrystalline glass product, and components of the microcrystalline glass product are shown in percentage by weight, and the microcrystalline glass product contains SiO2: 40-55%; Al2O3: 15-30%; Li2O: 0.1-6%; ZnO: 9-20%; MgO: 0.1-6%; and TiO2: 0.5-7%. Through reasonable component design, the microcrystalline glass product obtained by the application has excellent mechanical properties and is suitable for display devices or electronic devices.

The present application relates to the technical field of glass-ceramics, in particular to a lithium-free transparent spinel glass-ceramics, a preparation method and application thereof. The lithium-free transparent spinel glass-ceramics is obtained by heat treatment of a base glass, and spinel crystal is the main crystal phase. The composition of the glass-ceramics contains the following oxides in mol%: SiO2 38.00-48.00%, Al2O3 25.50-30.00%, ZrO2 3.00-5.00%, MgO 5.00-8.00%, ZnO 8.00-14.00%, Na2O 7.20-14.00%, B2O3 3.00-8.00%, K2O 0-2.00%, and Y2O3 0-1.00%, and basically no Li2O. The glass-ceramics of the present application does not use high-cost lithium, and can obtain excellent surface and deep stress characteristics and excellent drop impact resistance through chemical strengthening.

The invention relates to the technical field of industrial vision, in particular to a ceramic glazed tile internal defect detection method based on image recognition, which comprises the following steps: acquiring multi-modal data including an X-ray tomography sequence, a surface heat map, a visible light image and production process parameters; constructing a three-dimensional digital twin based on X-ray data, fusing surface image information, and utilizing a three-dimensional segmentation network to accurately identify three-dimensional geometric features of internal and underglaze defects; carrying out physical causal reasoning on the geometrical characteristics of the defects through the constructed defect-cause knowledge graph reasoning model, and intelligently matching and identifying the physical causes of the defects; targeted correlation analysis and traceability are performed in combination with physical causes and production process parameters, production links causing defects are accurately positioned, and a control instruction for optimizing production is generated. According to the method, closed-loop defect detection of'diagnosis-traceability-control 'is realized, the defect problem can be accurately positioned, and automatic decision support is provided for optimizing production and improving product quality.

The invention belongs to the field of materials, and particularly relates to a composite thermal interface material and a preparation method thereof. The preparation method comprises the following steps: plating non-reactive metal, non-reactive metal carbide or non-reactive ceramic on the surface of diamond micro powder, inducing lattice defects on the surface of a plating layer and alloying a local interface by combining a mechanical force field, and defoaming to obtain the composite thermal interface material. The composite thermal interface material has high thermal conductivity and long-term stability, and the contradiction between excessive alloying of a traditional reactive coating and high interface thermal resistance of a non-reactive coating is solved. The method is particularly suitable for the field of thermal management of high-end electronic devices such as 5G chips and power modules.

The invention discloses a preparation method and application of monolithic BiVO4 photocatalytic foamed ceramic. The method comprises the following steps: 1) preparing composite slurry containing BiVO4 powder, an organic additive and a reinforced phase; (2) uniformly attaching the composite slurry to the organic foam skeleton by adopting an impregnation method; 3) performing drying and heat treatment to remove organic components; and 4) performing high-temperature sintering to form the three-dimensional communicated porous structure. Through the structure-function integrated design, the problems that a traditional powder catalyst is difficult to recover, the activity of an immobilized catalyst is low and a supported catalyst is easy to fall off are solved. The obtained product is high in porosity, the compressive strength is larger than or equal to 0.1 MPa, the specific surface area is larger than or equal to 0.1 m < 2 > / g, visible light can be efficiently utilized for degrading emerging organic pollutants in water, and the degradation rate reaches 20-99%. The material has no nano-particle leakage risk, has excellent mechanical strength, chemical stability and engineering applicability, and provides a feasible scheme for large-scale application of a photocatalytic water treatment technology.

The invention discloses a high-strength silicon carbide ceramic material and a preparation method thereof, and relates to the technical field of ceramic material preparation. The silicon carbide ceramic material is prepared from the following raw materials in parts by weight: 70-85 parts of silicon carbide powder, 5-15 parts of B4Cw-coated BN, 3-5 parts of a sintering aid, 0.5-1 part of a dispersing agent and 0.5-2 parts of carbon black, the B4Cw-coated BN is prepared by the following steps: pretreating a boron carbide whisker with a silane coupling agent, adding the pretreated boron carbide whisker into a precursor solution containing boric acid and urea, and reacting to obtain the boron carbide whisker with a BN coating; the sintering aid is formed by mixing Y2O3 and Al2O3; the dispersing agent is ammonium polyacrylate. The preparation method of the high-strength silicon carbide ceramic material comprises the following steps: pretreating boron carbide whiskers, synthesizing B4Cw-coated BN, preparing composite powder, and preparing the silicon carbide ceramic material. The high-strength silicon carbide ceramic material disclosed by the invention has relatively high bending strength and elasticity modulus.

The invention discloses a special grinding aid for gold ore and a preparation method thereof, and belongs to the technical field of mineral processing, the special grinding aid for gold ore comprises the following raw materials: a monomer, an initiator, a chain transfer agent and a solvent; the monomers are an unsaturated polyether monomer A and an unsaturated carboxylic acid monomer B; or a monomer C containing an ethylenically unsaturated sulfonic acid group. The preparation method comprises the following steps: putting the raw materials into a water bath kettle, and polymerizing in a separate dropwise adding manner to prepare the special grinding aid for the gold ore. The prepared grinding aid can improve the problems of particle agglomeration, low fine grinding efficiency, low gold dissociation efficiency and the like in the gold ore grinding process, the concentrated utilization of the grinding aid limited in the fields of cement, ceramics and the like is improved, the grinding energy consumption can be reduced, and the material quality can be improved.

The invention discloses environment-friendly ceramic and a preparation method thereof, and belongs to the technical field of ceramic. The environment-friendly ceramic comprises the following raw materials in parts by weight: 30-50 parts of red mud, 20-40 parts of fly ash, 10-25 parts of purple clay, 5-15 parts of quartz, 3-8 parts of a composite binder, 3-8 parts of a composite fluxing agent and 40-50 parts of deionized water. The environment-friendly ceramic prepared by the method disclosed by the invention has excellent breaking strength and apparent porosity.

The invention discloses automatic glaze hanging treatment equipment for ceramic cups, and relates to the technical field of ceramic cup production, the automatic glaze hanging treatment equipment comprises a first conveyor, the first conveyor is used for conveying cup bodies, one end of the first conveyor is provided with a cleaning box, and the automatic glaze hanging treatment equipment further comprises a glaze hanging pool, a second conveyor, a displacement mechanism and a glaze hanging mechanism. By arranging the displacement mechanism and the glaze hanging mechanism, two clamping rods on a clamping seat are used for clamping a cup body, the cup body is placed into a glaze hanging tank by the clamping seat, the cup body is placed on two supporting rods, and in the process that a lifting frame moves downwards, the two supporting rods are far away from each other for displacement, so that the two supporting rods are opened; when glaze enters the cup body, the contact position of the supporting rod and the cup body is changed, automatic glaze hanging on the ceramic cup is facilitated, meanwhile, when the glaze enters the cup body, the contact position of the supporting rod and the cup body is changed, all positions of the cup body can make contact with the glaze, and the situation that the contact position of the supporting rod and the cup body does not make contact with the glaze is avoided.

The invention discloses ceramic cup firing forming equipment, and relates to the technical field of firing forming equipment, the ceramic cup firing forming equipment comprises a kiln and a base, the base penetrates through the kiln, a rotatable ceramic roller bar is installed on the base, a supporting frame is placed at the top end of the ceramic roller bar, the ceramic roller bar is used for driving the supporting frame to be conveyed from a kiln head to a kiln tail, and the ceramic roller bar is used for driving the supporting frame to rotate. The supporting frame is composed of a bottom plate and a supporting plate and comprises a connecting mechanism and a limiting mechanism. By arranging a connecting mechanism and a limiting mechanism, a cup body is placed at the top end of a grid plate, a supporting plate is assembled above a bottom plate, at the moment, a transverse rod moves, a sliding rod slides in an inclined groove to drive a vertical rod to move upwards, the vertical rod drives a limiting frame to move, and the limiting frame moves to drive a limiting groove to move to the outer side of the bottom of the cup body; and the limiting groove is used for limiting the cup body, so that the ceramic cup can be conveniently limited in the firing process, and the cup body is prevented from shifting in the firing process.

The application discloses a silicon carbide ceramic and a preparation method thereof. The bending strength of the silicon carbide ceramic is not less than 600 MPa, and the fracture toughness of the silicon carbide ceramic is not less than 10 MPa·m 1 / 2 The silicon carbide ceramic not only has high strength, but also has high toughness, and can be applied to many fields such as aerospace, mechanical industry and electronic devices.

The invention relates to the technical field of material science, and discloses a slurry valve erosion-resistant multi-layer coating with gradient function design and a preparation method thereof.The coating comprises a bonding layer, a gradient function layer and an erosion-resistant surface layer which are sequentially arranged from inside to outside, the bonding layer is composed of nickel-based alloy or cobalt-based alloy, the thickness of the bonding layer is 50-100 micrometers, and the thickness of the gradient function layer is 50-100 micrometers. The gradient functional layer is made of composite powder of metal and ceramic, the metal is nickel or cobalt, the ceramic is tungsten carbide or chromium carbide, and the components of the gradient functional layer are from the bonding layer side to the erosion-resistant surface layer side; the bonding layer is arranged and forms firm metallurgical bonding with the matrix, the interface stress is reduced, the basic reliability of bonding of the coating and the matrix is guaranteed, meanwhile, the gradient functional layer with the metal and ceramic volume fraction gradually changing continuously is adopted, the problem that the thermal expansion coefficients of the coating and the matrix are not matched is solved, and the service life of the coating is prolonged. And the crack initiation and expansion risk caused by internal stress concentration is reduced, so that the long-term stability of the coating structure is ensured.

Disclosed herein are methods for setting the radiation sensitivity and operational temperature range of ion-conducting polycrystalline radiation detectors. Disclosed herein are material fabrication methods for setting the ion-conducting polycrystalline microstructure and the grain boundary ion blocking characteristics in ion-conducting polycrystalline materials. The methods may include introducing a selected precursor element into the grain boundaries of the ion-conducting polycrystalline material. These methods may allow for the device detection threshold, dynamic range, and / or operational temperature range to be adjusted for ion-conducting polycrystalline radiation detectors. The methods disclosed herein allow for the design of high-sensitivity and high-performance radiation detectors that are low cost, non-toxic, environmentally robust, scalable, and able to operate in harsh environments (e.g., high temperature, high humidity, pressure, and / or corrosive).

The invention belongs to the field of life, and particularly relates to a thermos bottle with visible water storage capacity. The thermos bottle comprises a shell and an inner container arranged inside the shell. A base capable of vertically moving is mounted at the bottom of the shell, an elastic airbag is fixedly connected between the upper end of the base and the lower end of the inner container, a vertical strip opening is hermetically connected onto the side wall of the shell, a transparent tube is fixedly connected into the strip opening, the lower end of the transparent tube is communicated with the elastic airbag, and a piston block is hermetically connected into the transparent tube. The quantity of water in the thermos bottle can be known by observing the position of a piston block, a piezoelectric ceramic is used for power generation when water is injected, an LED (light-emitting diode) lamp in the piston block can emit light, the quantity of the water in the thermos bottlecan be known conveniently by people, and scalding is avoided. In addition, by the aid of an annular air cushion, when the thermos bottle falls, a good buffering function can be achieved, and impact onthe inner container is reduced.

The utility model provides a multifunctional rolling production line for domestic ceramics, which comprises a circulating line, a variable-diameter mud throwing machine with two sets of mud cutting platforms is arranged on the starting side of the circulating line, and mud strips with different diameters conveyed on the two platforms are quantitatively cut off by a mud cutting assembly and then conveyed to a mold on the circulating line by a feeding assembly. A tool changing platform is erected at the head end of the circulation line, a rotary disc in the tool changing platform clamps a plurality of rolling heads, the rotary disc moves the corresponding rolling heads to the position below a rolling head base under driving of a pushing air cylinder, a tool beating air cylinder on the rolling head base drives a built-in grabbing hook to clamp the rolling heads, the rolling head base is hinged to a clamping plate of a roller press, and the included angle is adjusted through a push-pull assembly. A transfer manipulator is arranged at the outlet of the drying room; according to the production line, mud strips with proper diameters and lengths are put into molds according to the types of the molds, corresponding rolling heads can be automatically replaced, parameters such as inclination angles and rotating speeds can be automatically adjusted, non-stop continuous production of different types of ceramics is achieved, and the production line is suitable for production of various types of small-batch domestic ceramics.

The invention relates to the technical field of high-entropy ceramics, and discloses a quinary high-entropy carbide ceramic and a preparation method thereof.The quinary high-entropy carbide ceramic (TiZrHfTaV) C is prepared by mixing transition metal carbides TiC, ZrC, HfC, TaC and VC, drying, grinding, sieving and sintering. In the quinary high-entropy carbide ceramic (TiZrHfTaV) C, the molar ratio of Ti to Zr to Hf to Ta to V is 0.25: 0.25: 0.2: 0.2: 0.1. The preparation method is easy and convenient to operate, short in reaction time and simple in technological process, and the prepared product is excellent in performance and has wide application prospects.

The invention discloses a low dielectric constant temperature-stable phosphate microwave dielectric ceramic material for LTCC and a preparation method thereof, the chemical composition formula of the phosphate microwave dielectric ceramic material is A3-xK2x (PO4) 2, A = Ba1-ySry, x is more than or equal to 0.1 and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 1, and the phosphate microwave dielectric ceramic material comprises two phases of A3 (PO4) 2 and KAPO4; the preparation method comprises the following steps: regulating and controlling the A-site ion radius of A3 (PO4) 2-based ceramic, pre-sintering to directly synthesize complex-phase powder containing phases A3 (PO4) 2 and KAPO4 in situ in one step, then adding H3BO3 powder accounting for 1-5% of the total mass of a base material, and carrying out ball milling, drying, sieving, forming, rubber discharging and sintering to obtain a ceramic sample; the ceramic material has a low sintering temperature (850-950 DEG C), a low dielectric constant (epsilon r = 8.9-12.6), a high quality factor (Q * f = 10186-50213 GHz) and a near-zero temperature resonance frequency coefficient (-7.1-7.2 ppm / DEG C), the preparation process is simple, the cost is low, the raw materials are non-toxic and easy to obtain, and the ceramic material is suitable for being used as an LTCC dielectric substrate material and has important industrial application value.

The invention discloses a synergistic phase change reinforced dental zirconia material and a preparation method and application thereof, and relates to the technical field of ceramic materials.The preparation method comprises the following steps that a zirconium oxychloride solution and a polyvinyl alcohol solution are mixed, dried and then subjected to heat treatment, and ZrC ceramic powder is obtained; then mixing with yttria-stabilized zirconia (Y-PSZ) to obtain composite powder; the composite powder is subjected to hot pressing sintering and cooling, and a pre-sintered body is obtained; introducing Ar-O2 mixed gas, and carrying out controllable oxidation to obtain an oxidation phase change reinforced pre-sintered body; and carrying out high-temperature sintering to obtain the synergistic phase change reinforced dental zirconia material. The invention further discloses the synergistic phase change reinforced dental zirconia material and application of the synergistic phase change reinforced dental zirconia material in preparation of dental products. According to the method, ZrC is introduced, and a pressure stress field formed by crystal transformation in ZrC oxidation and high-temperature sintering processes is utilized, so that the yttrium oxide stabilized zirconia dental ceramic is strengthened, and the mechanical strength of the yttrium oxide stabilized zirconia dental ceramic is remarkably improved.

The utility model discloses a diamond grinding brush applied to glass and ceramics, and relates to the technical field of diamond grinding brushes, the diamond grinding brush comprises a mounting disc and a diamond brush head, the front surface of the mounting disc is provided with a front positioning groove, the back surface of the mounting disc is provided with a back positioning groove, and the back surface of the diamond brush head is fixedly provided with a connecting plate; a connecting block is fixedly installed on the side, away from the diamond brush head, of the connecting plate, an inserting hole is formed in the inner side of the connecting block, and the side, close to the connecting block, of the diamond brush head is inserted into the inner side of the front positioning groove. By the adoption of the structure, after the clamping spring and one fixing bolt are taken down, the limiting frame is pulled out, and at the moment, the spring in the mounting cavity resets to push the limiting plate to move and drive the insertion block to be separated from the insertion hole of the connecting block, so that the diamond brush head can be conveniently and rapidly disassembled, assembled and replaced.

The invention discloses a piezoelectric ceramic fatigue life analysis method based on macro and micro multi-scale. The method comprises the following steps: firstly, automatically establishing a microcosmic unit cell model based on a Python script, realizing automatic assignment of material parameters and application of periodic boundary conditions, and calculating microcosmic unit cell homogenization mechanical parameters; then constructing a macroscopic driver model, inputting microscopic parameters as material attributes, and performing macroscopic fatigue life prediction and damage distribution simulation in combination with a Miner linear damage accumulation theory; and finally, through macro-micro coupling analysis, transmitting the strain of the macroscopic maximum stress unit to the micro model, and researching the intergranular stress distribution characteristics and the interface damage evolution law of the piezoelectric ceramic. According to the method, a multi-scale modeling strategy is adopted, cross-scale fatigue performance prediction from the micro grain scale to the macro structure scale is achieved, and an effective means is provided for reliability design and service life evaluation of the piezoelectric ceramic driver.

The invention provides a solid-state battery and a preparation method thereof, a battery device, a power utilization device and an energy storage device, the solid-state battery comprises a positive electrode, a negative electrode, an electrolyte and an interface layer, and the interface layer comprises the following components in percentage by mass: 50wt%-70wt% of light-cured resin, 10wt%-20wt% of an inorganic nano filler, 15wt%-25wt% of an ionic conductor material, 0.1 wt%-6wt% of an additive and 1wt%-2wt% of a photoinitiator; the additive comprises scandium salt and tin salt, and the molar ratio of the scandium salt to the tin salt is 1: (1.2-1.8); in the interface layer, the inorganic nanofiller is of a core-shell structure, the inorganic nanofiller comprises a plurality of ionic conductive ceramics parallel to one another and an iron-containing magnetic substance located on at least part of the surface of the ionic conductive ceramics, the ionic conductive ceramics are of a rod-shaped structure, and the included angle between the inorganic nanofiller and the surface where the negative electrode is located is 60-120 degrees.

The invention belongs to the technical field of porous tantalum carbide ceramic preparation, and particularly relates to a preparation method of porous tantalum carbide ceramic based on a broken framework, which comprises the following steps: S1, preparing dipping slurry; s2, a polyurethane foam template is immersed in the dipping slurry, the polyurethane foam template is fully pressed so that the holes can be filled with the slurry, and the template is repeatedly rolled through a roller till no slurry flows out of the template; s3, drying the impregnated template, performing high-temperature treatment on the dried template, and cooling to room temperature to obtain a porous tantalum carbide framework; s4, crushing the porous tantalum carbide skeleton into a crushed skeleton with the size of 0.1-5 mm; s5, preparing a phenolic resin solution, mixing the crushed framework with the phenolic resin solution, then transferring the mixture into a mold, and forming after applying a certain pressure to obtain a porous tantalum carbide green body; the crushing brackets are stacked and spliced together to form a porous structure, the pores of a finished product can be adjusted by changing the sizes of the crushing brackets, and the crushing bracket can be applied to finer pores and is extremely low in shrinkage rate.

The invention relates to a multi-stage granulation crushing device for ceramics, and belongs to the technical field of ceramic granulation, the multi-stage granulation crushing device comprises a crushing cylinder, a feeding cylinder is fixedly mounted at the top of the crushing cylinder, a feeding hopper is fixedly mounted on one side of the feeding cylinder, and a dustproof dissipation assembly is arranged on the feeding cylinder; and the dustproof dissipation assembly comprises a dust baffle rotationally installed on the inner side wall of the feeding barrel, an air blowing pipe is fixedly installed at the top of the feeding barrel, an air blowing net plate is fixedly installed at the top of the air blowing pipe, air blowing blades are rotationally installed at the bottom of the air blowing net plate, and an air blowing motor is fixedly installed at the top of the air blowing net plate. According to the multi-stage granulating and crushing device for ceramics, a dust baffle is arranged at the joint of a feeding hopper and a feeding barrel, an air blowing pipe is arranged at the top of the feeding barrel, an air blowing motor drives air blowing blades to rotate, air is blown into a crushing barrel, dust is blocked through the dust baffle, and the dust is blown into the crushing barrel through air flow; and dust is prevented from escaping from the feeding hopper.

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 metal materials, in particular to a ceramic reinforced aluminum alloy composite material and a preparation method thereof. The aluminum alloy composite material comprises the following raw materials in parts by weight: 75-85 parts of an aluminum alloy matrix and 10-20 parts of a ceramic reinforced phase, a preparation method of the ceramic reinforced phase comprises the following steps: step 1, adding silicon carbide and a silane coupling agent into absolute ethyl alcohol, and drying after ultrasonic dispersion; 2, dissolving tetraethoxysilane in an ethanol-water mixed solvent, adjusting the pH value to 3-4, adding the silicon carbide treated in the step 1, stirring to form sol, drying, converting into gel, and calcining to form a coating layer; step 3, dispersing the silicon carbide treated in the step 2 into water, adding nickel nitrate, uniformly stirring, adding a reducing agent, stirring for reaction, and collecting precipitate particles; and 4, adding an interface modifier, and uniformly mixing. The ceramic reinforced aluminum alloy composite material has high strength, high wear resistance and good mechanical property and thermal stability.

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

The invention relates to the technical field of ceramics, and discloses a high-strength anti-cracking ceramic and a preparation method thereof. According to the ceramic, through innovative material modification and process optimization, the strength and crack resistance of traditional ceramic are remarkably improved. The preparation method comprises the following steps: firstly, carrying out surface modification on nano titanium dioxide by using double-end carboxyl polyquaternium to obtain polyquaternium modified titanium dioxide; mixing and ball-milling quartz, clay, feldspar, aluminum oxide, talcum powder, modified titanium dioxide and other raw materials, molding and sintering to obtain the ceramic. Through the interface modification effect of the double-end carboxyl polyquaternium, the nano titanium dioxide is uniformly dispersed and firmly combined with a matrix, crack propagation is effectively hindered, and the obtained ceramic has excellent bending strength and compressive strength, widens the application field of ceramic products and has wide market application prospects.

The invention discloses ceramic containing an air cooling structure and a preparation method and application thereof. The method comprises the following steps: uniformly mixing a sintering aid and ceramic powder, embedding the mixture into a template for pre-pressing molding, sintering at high temperature, and removing the template by adopting a high-temperature oxidation method (800-1000 DEG C, 1-3 hours) combined with a sand blasting auxiliary method (the sand blasting pressure is 0.2-0.8 MPa, and the sand blasting time is 1-5 minutes) to form a through air cooling channel; for ceramic powder easy to react with the template, spraying a boron nitride coating of 5-20 microns on the surface of the template to prevent interface reaction; various sintering modes (such as air pressure sintering and spark plasma sintering) and template shapes (such as a straight-through type and a spiral type) are supported, the structural controllability is good, channels are removed cleanly, and the process is simple; the obtained ceramic has excellent thermal management capability while maintaining high density and mechanical properties, and is suitable for high thermal load environments such as hot end parts of aerospace engines and the like.

To provide a ceramic having a high coefficient of thermal expansion and a low dielectric constant.SOLUTION: 50.0 to 90.0 mass% of 2MgO and SiO2, a total of 8.0 mass% or more of one of 7.0 to 14.0 mass% of ZrO2 and 10.0 to 50.0 mass% of Al2O3 or both of 14.0 mass% or less of ZrO2 and 50.0 mass% or less of Al2O3, and 3.0 to 15.0 mass% of one or more selected from Y2O3, CaO, CeO2, and HfO2, wherein a crystalline structure of the is a cubic structure. ZrO2.SELECTED DRAWING: None

The invention discloses a method for preparing high-toughness silicon nitride ceramic from Si3N4 and multi-element rare earth additive core-shell structure powder, multi-element rare earth nitrate, tetraethoxysilane and Si3N4 powder are used as main raw materials, elements of a multi-element rare earth sintering additive system are uniformly distributed through a sol-gel method, and silicon nitride particles are uniformly coated, so that the high-toughness silicon nitride ceramic is prepared. A uniform liquid phase can be provided for dominant development of silicon nitride crystal grains, so that full development of double-peak morphology of the silicon nitride crystal grains is promoted, and the bending strength and fracture toughness of the silicon nitride ceramic are improved.