273 results about "Dry pressing" patented technology

The invention relates to a zirconia-based all-ceramic false tooth and a preparation method thereof. A core layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 90 to 94 parts of ZrO2, 5 to 9 parts of Y2O3, 0.1 to 0.5 part of Al2O3, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2, and a shell layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 24.5 to 49.5 parts of CaCO3, 45 to 50 parts of SiO2, 0 to 25 parts of MgO, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2. The preparation process comprises the following steps: performing dry pressing and isostatic pressing on raw materials of the core layer, presintering, and carving to obtain a zirconia-based false tooth biscuit; meanwhile, calcining raw materials of a shell layer, then adding deionized water, a dispersing agent and an adhesive, and carrying out ball milling and mixing to obtain calcium-magnesium-silicon-based ceramic slurry; and coating the calcium-magnesium-silicon-based ceramic slurry on the surface of the zirconium oxide-based false tooth biscuit, and sintering to obtain the zirconium oxide-based all-ceramic false tooth provided by the invention. The zirconia-based all-ceramic false tooth has good jade texture and is closer to the natural color of natural teeth.

The invention discloses an all-solid-waste negative-carbon porous brick and a preparation method thereof, belongs to the technical field of green building materials for solid waste recycling and CO2 capture-storage-utilization, and particularly relates to a porous brick which takes red mud, steel slag and recycled aggregate as main raw materials, constructs a hierarchical pore structure through low-water-binder-ratio semi-dry pressing molding, and is prepared from the following raw materials in a solid-solid-waste negative-carbon porous brick. And directional carbonization curing is carried out by using cement kiln tail gas CO2 under the conditions of normal temperature and micro pressure, so that the national waste porous brick with negative carbon characteristic is prepared. According to the method, solid waste high doping, CO2 efficient solid storage and product performance synergistic improvement can be achieved.

The invention belongs to the technical field of ceramic preparation, and discloses a dry pressing forming machine for PTC ceramic heater powder preparation, which comprises a shell, and further comprises a lower mold, an upper mold and a lower mold, the lower mold is arranged on the outer wall of the shell, and a demolding mechanism is arranged on the inner wall of the lower mold; the driving module is arranged on the outer wall of the top end of the shell, and an upper mold is arranged at the movable end of the driving module through a connecting mechanism; the collecting mechanism is arranged in the inner wall of the shell; wherein the demolding mechanism comprises a moving rod, and the inner wall of the moving rod is elastically connected with a triangular block through an elastic piece A; through cooperation of the cambered surface block, the moving rod and other structures, the upper mold moves upwards to drive the ejection block to eject a ceramic green body upwards out of the mold cavity, the two sets of lower molds move towards the two sides at the same time to be disengaged from the green body, it is ensured that the green body is not bonded with the mold cavity, and then an operator can take out the green body conveniently.

The invention discloses a dry pressing forming mold and a pressing method thereof, and belongs to the technical field of powder dry pressing, the mold comprises a lower mold assembly, the lower mold assembly comprises a lower mold base and a lower mold cushion block arranged above the lower mold base, a containing cavity is formed in the lower mold base, and a plurality of mold cores are axially and slidably connected in the containing cavity and the lower mold cushion block; a lower male die assembly is arranged outside the mold core and located on the side, away from the lower die base, of the lower die cushion block, the lower male die assembly is slidably connected with a middle die assembly, and the middle die assembly, the lower male die assembly and the mold core form a cavity. The upper male die floats downwards to enter a certain position of the middle die cavity according to the thickness of the blank, and primary extrusion of cavity powder is completed; then the upper male die, the middle die assembly and the mold core float downwards synchronously, and secondary pressing is conducted on the powder till a blank forms a product; finally, the upper male die ascends to leave the cavity; and the middle mold plate floats downwards, meanwhile, the adjusting mechanism adjusts the position of the mold core to be unchanged, after the product is separated from the mold cavity, the driving mechanism drives the mold core to return instantly, and demolding is completed.

The invention relates to the technical field of ceramic products, in particular to a high-temperature-resistant and high-strength domestic ceramic product and a preparation method thereof.The preparation method comprises the following steps that modified alumina fibers, silicon carbide, a dispersing agent, a binding agent and deionized water are subjected to ball milling and mixing, and ceramic slurry is obtained; the modified alumina fiber is obtained by heating alumina-zirconia-lithium scandium silica gel fiber from room temperature to 600 DEG C at a heating speed of 2 DEG C / min, and keeping the temperature for 2 hours; the temperature is increased to 1000 DEG C at the temperature increasing speed of 8 DEG C / min, and heat preservation is conducted for 2 h; and carrying out spray granulation, dry pressing and sintering on the ceramic slurry to obtain the high-temperature-resistant and high-strength domestic ceramic. The alumina fiber is modified; the fracture toughness and the fracture strain of the silicon carbide ceramic can be remarkably improved, and the fracture toughness, the impact strength and the high-temperature strength retention rate of the silicon carbide ceramic can also be improved; and CTE gradient transition is realized, and the problems of high-temperature grain coarsening and brittle phase are solved.

The invention belongs to the technical field of electronic ceramic substrate materials, and particularly relates to a preparation method of a microcrystalline glass composite silicon nitride ceramic substrate, which is prepared from the following raw materials: 1-5% of alpha-phase silicon nitride powder, 86-95% of beta-phase silicon nitride powder, 0.2-3% of metal silicon powder, 2.5-8% of glass powder and 1.3-8% of metal oxide. The preparation method comprises the following steps: S1, mixing and grinding raw materials to obtain ceramic slurry; s2, adding Arabic gum into the ceramic slurry as a binder, and carrying out spray granulation; granulation powder is obtained; s3, carrying out dry pressing molding and cold isostatic pressing treatment on the granulation powder to prepare a ceramic plate blank; and S4, sintering and crystallizing the ceramic plate blank. According to the invention, the glass ceramic powder is introduced as a sintering aid and a second phase, and the sintering temperature of the silicon nitride is obviously reduced from the conventional temperature of more than 1800 DEG C to 1500 DEG C by utilizing the liquid phase effect of the glass ceramic powder in the sintering process, so that two modes of air pressure sintering and normal pressure sintering can be used, and the energy consumption and the requirements on equipment are reduced.

The invention discloses a nano-material piezoresistor and a preparation method thereof, and belongs to the technical field of piezoresistors, the preparation method of the nano-material piezoresistor comprises the following steps: S1, preparing raw materials for preparing the piezoresistor by mole percent: 94 to 96 percent of ZnO, 1.0 to 1.5 percent of Bi2O3, 0.5 to 1.5 percent of Co3O4, 0.3 to 0.8 percent of Mn2O3, 1.0 to 3.0 percent of Sb2O3 and 0.3 to 0.8 percent of NiO; s2, additives except ZnO are mixed, deionized water and a dispersing agent are added to prepare additive slurry, the additive slurry is dried and smashed after being sanded, and additive powder is obtained; s3, mixing ZnO with the additive powder, adding deionized water, a dispersing agent and a binder, and performing ball milling and refining in a ball mill to obtain total slurry; and S4, carrying out spray granulation, water-containing aging and dry-pressing molding on the total slurry, carrying out glue removal treatment on a green body subjected to dry-pressing molding, then carrying out high-temperature sintering, grinding and flattening, then carrying out heat treatment, coating silver electrodes on the upper and lower end surfaces, and coating insulating glaze on the side surfaces to obtain the piezoresistor. Wherein the dispersing agent improves the dispersity of the nano-powder, and the nano-powder has application prospects.

The present invention relates to the technical field of daily-use ceramics, and specifically to a high-strength daily-use ceramic and a preparation method thereof. This solution uses raw materials such as "kaolin, quartz, potassium feldspar, clay, talc, zirconia, corundum" in compound, and is processed into a green body by dry pressing molding. Zirconia and corundum are introduced into the green body to enhance and toughen the green body ceramics, so that the prepared green body has excellent flexural strength and mechanical properties; after drying the green body, glaze is applied on the surface to improve the surface hardness and wear resistance of the ceramics. Tourmaline is introduced into the glaze in this solution. Tourmaline can emit far-infrared rays, which can be absorbed by the human body, thereby improving blood circulation and enhancing human immunity. Tourmaline can also generate negative ions, catalyze and degrade organic harmful substances in the air, and purify the air. Therefore, the daily-use ceramics prepared by this solution have high environmental friendliness and higher practicality.

The invention provides normal-pressure sintered silicon carbide ceramic and a preparation method thereof. The normal-pressure sintered silicon carbide ceramic is prepared from the following raw materials in percentage by weight: 40 to 90 percent of silicon carbide micro powder, 5 to 60 percent of quartz powder, 2 to 10 percent of graphite powder, 2 to 20 percent of phenolic resin solution, 40 to 60 percent of absolute ethyl alcohol solution and 0.5 to 2 percent of oleic acid. The preparation method comprises the following steps: stirring, grinding, dispersing, granulating and carrying out dry pressing to obtain a product, putting the pressed and molded product into a vacuum furnace, pre-sintering at 1200 DEG C, putting the pre-sintered product into a vacuum furnace into which argon is introduced, and carrying out high-temperature sintering to obtain the high-purity silicon carbide sintered body. The normal-pressure sintered silicon carbide ceramic produced by the method is stable and reliable in product quality, the shrinkage distortion is less than 18%, the porosity is less than 1%, the qualified rate of the product can reach more than 95%, a siliconizing process is canceled, waste products are greatly reduced, the production operation environment is improved, pollution is completely eradicated, and the occupational health of production operation personnel is ensured.

The invention belongs to the technical field of ceramic products, and particularly relates to a ZTA composite ceramic grading wheel and a preparation method thereof. The preparation method of the ZTA composite ceramic grading wheel comprises the following steps: firstly, mixing and grinding aluminum oxide, zirconium oxide, a sintering aid, a dispersing agent and a lubricating agent, and carrying out spray granulation; then sequentially carrying out dry pressing molding, cold isostatic pressing molding and hot pressing molding, and treating to obtain a near-net-size green body; and finally, the ZTA composite ceramic grading wheel is obtained through sintering and surface treatment. The dry pressing pressure is 50-200MPa, and pressing to obtain a green body with the density of 50-60%; and the cold isostatic pressing molding is to pressurize the sheath to 100-300MPa. The hot press molding is pressing at the temperature of 1300-1500 DEG C and the pressure of 20-50 MPa. The ZTA composite ceramic grading wheel provided by the invention is high in fracture toughness, high in hardness and high in dynamic balance precision, and the invention further provides a preparation method of the ZTA composite ceramic grading wheel.

This invention specifically relates to a high-absorption, high-strength porous ceramic based on solid waste and its preparation method. The technical solution is as follows: The alkali activator, the first solid waste, the second solid waste, and the pore-forming agent are mixed uniformly in a mass ratio of 1:90~100:100~200:500~800. The mixture is then dry-pressed, constant-temperature cured to obtain a cured green body. The cured green body is then washed with water, cured, and dried at 80~100℃ for 3~5 hours to obtain the high-absorption, high-strength porous ceramic based on solid waste. This invention features low cost, simple synthesis process, low energy consumption, and suitability for industrial production. The prepared high-absorption, high-strength porous ceramic based on solid waste has low bulk density, high water absorption, high strength, and good impact resistance, making it suitable for applications such as moisture regulation, filtration, separation, sound absorption, and heat insulation.

The invention discloses a powder spreading method and a powder spreading system of a zirconia ceramic block dry press for all-ceramic false teeth. The powder spreading method comprises the following steps: pouring quantitatively weighed zirconia powder into a pressing chamber; a powder spreading device is inserted into the material pressing cavity according to the first preset depth; the powder spreading device comprises a motor and a push plate which are sequentially connected in the longitudinal direction. The motor is used for driving the push plate to rotate with the center line of the pressing cavity as the axis. A motor is started to drive a push plate to rotate forwards, and first-time flattening is completed; the powder spreading device is lifted according to a second preset depth; the motor is started to drive the push plate to rotate reversely, and second-time flattening is completed; and the powder spreading device is withdrawn from the material pressing cavity. And through two-time flattening operation, the zirconium oxide powder in the material pressing cavity is uniformly flattened, so that the situation of local accumulation or local powder shortage is reduced, and the quality of dry pressing processing is favorably improved.

The invention discloses a low infrared absorption coefficient Y2O3 transparent ceramic and a preparation method thereof, and the preparation method comprises the following steps: carrying out dry pressing molding on Y2O3 powder, and carrying out cold isostatic pressing treatment to obtain a ceramic biscuit; the ceramic biscuit is subjected to glue discharging at the temperature of 600-1250 DEG C; carrying out vacuum heat treatment on the biscuit subjected to glue removal under the conditions that the vacuum degree is less than or equal to 10 Pa and the temperature is 400-1550 DEG C so as to remove residual hydroxyl; pre-burning the sample subjected to vacuum heat treatment in air or oxygen; and carrying out hot isostatic pressing sintering on the pre-sintered sample to realize ceramic densification so as to obtain the Y2O3 transparent ceramic. By adopting the preparation method disclosed by the invention, an expensive high-vacuum sintering furnace does not need to be arranged, and pre-sintering of the Y2O3 transparent ceramic can be completed by using a simple atmosphere sintering furnace, so that the Y2O3 transparent ceramic with high optical quality is obtained.

The application discloses a dry pressing equipment for ceramic piece forming and relates to the technical field of ceramic forming, which comprises a U-shaped fixing table, the two sides of the fixing table are provided with guide grooves, a grinding assembly is slidably connected in the guide grooves, and a punch press is arranged at the upper end of the initial position of the grinding assembly; a discharging assembly is arranged on the top of the side wall of the fixing table, the grinding assembly is composed of an electric sliding block, a rotating rod, the fixing table and a grinding tool; the discharging assembly is composed of an electric push rod two, a push plate and a powder guide pipe; an inclined sliding table is fixed at the corresponding position of the lower end of the discharging assembly, three pairs of electric push rods one are symmetrically fixed on the two sides of the inclined sliding table, a support bag with a plurality of powder leakage holes is fixed on two pairs of the electric push rods one, a support net is fixed on the other pair of the electric push rods one, the other end of the support net is hingedly connected to the side walls of the inclined sliding table, the support net is formed by the staggered connection of a plurality of air bag type expansion pipes, the staggered gaps are dense away from the support bag, the staggered gaps are loose close to the support bag, and the residual part of the workpiece is prevented from being scratched with other intact workpieces.

The invention discloses a modified monosilicate ceramic material resistant to CMAS corrosion and a preparation method and application thereof, and relates to the technical field of aero-engine coating materials, the modified monosilicate ceramic material is (Yb1-XScX) 2SiO5, X = 0.1-0.3, the (Yb1-XScX) 2SiO5 is prepared from Yb2O3 powder, Sc2O3 powder and SiO2 powder, and the molar ratio of the Yb2O3 powder to the Sc2O3 powder to the SiO2 powder is (10-10) x: 10 x: 10. According to the modified monosilicate ceramic material resistant to CMAS corrosion, a modified monosilicate (Yb1-XScX) 2SiO5 block is obtained through dry pressing forming and high-temperature sintering, the corrosion rate of rare earth ions and CMAS is reduced through doping of Sc < 3 + >, and therefore the CMAS corrosion resistance of the material is more excellent than that of a single rare earth monosilicate Yb2SiO5 ceramic material, and the material is suitable for serving under the high-temperature complex working condition; and the service life of the environment barrier coating is prolonged.

The invention discloses a glue discharging method for a dry-pressed ceramic body of an electrostatic chuck, and belongs to the technical field of electrostatic chucks, and the glue discharging method comprises the following steps: S1, carrying out ball-milling mixing on alumina ceramic powder, a binder and a plasticizer, sieving to obtain granulation powder, carrying out primary dry-pressing molding to obtain an upper ceramic body and a lower ceramic body, printing an adsorption electrode layer, and carrying out secondary dry-pressing molding to obtain an upper ceramic body and a lower ceramic body; after lamination, carrying out secondary dry-pressing molding to obtain a dry-pressing molded ceramic green body; s2, after a furnace door of the rubber discharging furnace is closed, air is introduced into the rubber discharging furnace, the temperature in the rubber discharging furnace is increased to 150 DEG C, heat preservation is conducted, then the temperature in the rubber discharging furnace is increased to 300 DEG C, and heat preservation is conducted for 3-5 h; and S3, closing the air valve, opening the nitrogen valve, introducing nitrogen into a humidifier to convert the nitrogen into wet nitrogen mixed gas, introducing the wet nitrogen mixed gas into the rubber discharging furnace, raising the temperature to 450 DEG C, keeping the temperature for 3-6 hours, then reducing the temperature in the rubber discharging furnace to 300 DEG C, then reducing the temperature to 100 DEG C, and naturally cooling to obtain the dry-pressing formed ceramic green body after rubber discharging.

The pressing method comprises the following steps: preparing a flat plate gasket with a hole in the middle and the thickness of 10-15mm by adopting dry pressing molding, and controlling the pressing density of the flat plate gasket; then the gasket is positioned to a turning system through a robot, after secondary centering is conducted through an inner diameter pneumatic three-jaw and pneumatic pressing is conducted through a nylon block, synchronous rotation is conducted, and an outer diameter and 45-degree step structure is turned in sequence; after machining, dust is automatically blown and removed, excess materials are recycled, the step diameter and the step height size are detected through laser according to the set frequency, and alarming and shutdown are conducted when the difference is out of tolerance. The technical problems that the turning efficiency is low, the raw material utilization rate is low and the machining quality is unstable due to the fact that the outer diameter of a traditional isostatic pressing forming blank is irregular are solved.

The present application belongs to the field of environmental functional materials and water treatment technology, and aims to provide a preparation method of ceramic membrane based on endogenous pore forming and catalysis of sludge containing algae. The method comprises the following steps: taking dewatered sludge of water supply plant in algae outbreak period of water source, drying, ball milling and sieving to obtain sludge powder; soaking and washing after using organic acid with complexing ability as heavy metal removal agent, pre-carbonization treatment, dry pressing into embryo, sintering into membrane sheet; primary activation treatment in weak oxidizing strong acid, washing and heating treatment for secondary activation to obtain ultrafiltration ceramic membrane product. The method is simple in operation steps, easy to implement and green and environmental protection; the prepared ceramic membrane has good separation performance and high mechanical strength, can catalyze oxidizing agent commonly used in water treatment while filtering, and free radicals are generated by decomposition to degrade organic matter; or catalyze common cleaning agent sodium hypochlorite during membrane cleaning to generate free radicals to strengthen the cleaning effect.

The invention discloses a method for preparing porous zirconia ceramic by low-temperature sintering, which comprises the following steps: S1, mixing citric acid, zirconium acetylacetonate and absolute ethyl alcohol according to a certain proportion to obtain a colloidal solution A; s2, mixing inorganic yttrium salt, inorganic zirconium salt and water according to a certain proportion to obtain a mixed solution B; s3, slowly adding the colloidal solution A into the mixed solution B obtained in the step S2; s4, drying the colloidal solution to obtain a dried precursor; s5, carrying out low-temperature calcination on the dried precursor to obtain nano yttrium-stabilized zirconia powder; s6, performing ball milling and spray granulation on the powder to obtain spherical granulation powder with uniform particle size; s7, carrying out dry pressing molding and cold isostatic pressing molding to obtain a to-be-sintered ceramic biscuit; and S8, sintering in a muffle furnace to obtain the final porous zirconia ceramic. After the powder is subjected to ball milling, granulation, dry pressing and cold isostatic pressing, the zirconia ceramic which is uniform in pore diameter and has nano-scale pores is prepared through low-temperature sintering.

The invention discloses a method for preparing compact fine-grain magnesium aluminate spinel ceramic by low-temperature sintering, which comprises the following steps: S1, mixing ethanolamine, magnesium acetate tetrahydrate and water according to a certain proportion to obtain a mixed solution A; s2, mixing citric acid, aluminum isopropoxide and water according to a certain proportion to obtain a mixed solution B; s3, slowly adding the mixed solution A into the solution B in the step S2 to form uniform colloid; s4, drying the colloidal solution to obtain a dried precursor; s5, performing low-temperature calcination on the precursor to obtain nano magnesium aluminate spinel powder; s6, carrying out ball milling and spray granulation to obtain spherical granulation powder with uniform particle size; s7, performing dry pressing molding and cold isostatic pressing molding to obtain a to-be-sintered ceramic biscuit; and S8, sintering in a muffle furnace to obtain the final magnesium aluminate spinel ceramic. The powder is subjected to ball milling, spray granulation, dry pressing forming and cold isostatic pressing forming, and then the compact fine-grain magnesium aluminate spinel ceramic is prepared through low-temperature sintering.

The invention discloses a method and a device for full-automatic rapid granulation and dry pressing forming, and belongs to the technical field of powder pressing forming. Granulating the powder through electromagnetic vibration, and transferring the granulated powder to full-automatic dry-pressing molding equipment by using a mechanical arm for dry-pressing molding to obtain a green body with a designed shape; according to the invention, rapid full-automatic forming of multi-batch powder of small samples can be realized, technical support is provided for high-throughput all-solid-phase reaction experiment preparation, efficient and rapid design development or screening of materials is promoted, and meanwhile, a new way is provided for preparation of high-performance materials.

The invention provides a dry-pressing regenerated ceramic preparation method based on waste ceramic, which comprises the following steps: S1, raw material treatment: crushing ceramic waste into powder with the particle size of less than or equal to 35 microns, and screening into powder with coarse, medium and fine particle sizes; the powder is graded according to the particle size gradient, the coarse particles account for 40-60%, the medium particles account for 30-40%, and the fine particles account for 10-20%, so that the stacking density is improved; 12-15% of an inorganic binder and 1-3% of an organic binder are added, so that the strength of the green body is improved; s2, dry pressing molding: after uniformly mixing the mixture, controlling the water content of the mixture to be 4-6%; and carrying out dry pressing molding under the pressure of 50-100 MPa, wherein the pressure maintaining time is 10-30 seconds. According to the dry-pressing regenerated ceramic preparation method based on the waste ceramic, high-doping-amount (more than or equal to 70%) utilization of the waste ceramic is realized by optimizing the grain composition of the waste ceramic powder, a composite binder system and a low-temperature sintering process, and a regenerated ceramic product prepared by the method is high in strength, low in cost and suitable for the fields of decorative ceramics and cultural and creative ceramics.

The invention belongs to the technical field of multi-component garnet-based transparent ceramics, and discloses a novel multi-component garnet-based transparent ceramic for near-infrared laser. The chemical formula of the multi-component garnet-based transparent ceramic material is RE: LuxY (3-x) Al5O12. Commercial powder is adopted as a reaction raw material, an additional complex powder synthesis procedure is not needed, the difficulty and cost of raw material pretreatment are reduced, key steps such as ball milling, forming and sintering are integrated into a coherent integrated process through a high-temperature solid-phase reaction sintering method, conversion and intervention of intermediate links are reduced, and the preparation method is suitable for industrial production. Compared with the prior art, the method has the advantages that the whole technological process is simpler and clearer, standardized operation and parameter regulation and control are easy, the preparation period is greatly shortened, the production efficiency is improved, meanwhile, in the forming stage, through the mode of combining dry pressing and cold isostatic pressing, different mold designs can be flexibly adapted, preparation of large-size samples is achieved, and the regulation and control performance on the shapes of the samples is higher.

The invention relates to a high-thermal-conductivity nitride whisker reinforced nitride ceramic-based composite material and a preparation method thereof, and the preparation method comprises the following steps: dissolving a carbon precursor and an aluminum salt in a solvent containing a supporting electrolyte to obtain a carbon precursor / aluminum salt electrolyte; placing a conductive substrate in a carbon precursor / aluminum salt electrolyte, performing electrochemical deposition to obtain an aluminum / carbon precursor substrate, cutting the aluminum / carbon precursor substrate into a frame-type aluminum / carbon precursor growth substrate, transferring the frame-type aluminum / carbon precursor growth substrate into a graphitization furnace, and performing gradient heating carbon thermal reduction nitridation reaction to obtain an aluminum nitride whisker / porous carbon composite frame after the reaction; mixing the nitride particle powder, a sintering aid and a dispersing agent to obtain mixed slurry; and filling the aluminum nitride whisker / porous carbon composite frame with the mixed slurry, carrying out dry-pressing molding to obtain a composite board, and carrying out hot-pressing calcination to obtain the nitride nanofiber toughened nitride ceramic substrate. Accurate regulation and control of the growth process of the aluminum nitride whiskers are achieved, and the problems that the length-diameter ratio of aluminum nitride nanofibers is low, and distribution is uneven are effectively solved.

This invention discloses a preparation method and application of Al2O3 self-reinforced zirconia medical ceramic material, belonging to the field of bioceramic material preparation. The preparation method includes the following steps: first, aluminum particles are surface passivated, then mixed with Y2O3-ZrO2 ceramic powder, a dispersant, and a binder to prepare a slurry; the slurry is obtained through spray granulation and dry pressing; finally, the finished product is obtained through atmosphere sintering, oxygen absorption reaction, and high-temperature sintering. This invention utilizes the volume expansion effect of in-situ generated Al2O3 to artificially introduce a beneficial local compressive stress field into the zirconia matrix, effectively compensating for the phase transformation strengthening effect lost due to increased yttrium oxide content. This achieves a synergistic improvement in the mechanical properties and anti-aging properties of zirconia all-ceramic materials, solving problems such as insufficient anti-aging performance of existing zirconia all-ceramic materials, significant strength decrease after adding yttrium oxide, and insufficient strengthening effect of traditional Al2O3 second-phase addition.

The utility model belongs to the technical field of ceramic dry-pressing forming, and particularly relates to ceramic piece dry-pressing forming equipment which comprises a mounting bin and a bearing plate, the bearing plate is fixedly arranged on the end face of the mounting bin, a plurality of baffles are arranged on the end face of the bearing plate in a sliding mode, a rotary disc is rotationally arranged above the bearing plate, and a plurality of through grooves are formed in the end face of the rotary disc. A forming die is arranged in each through groove, and an ejection mechanism is arranged below the baffle. A plurality of cranks are rotationally arranged on the portion, above the through grooves, of the end face of the rotary disc, a rubber scraper is arranged outside each crank, a stamping disc is arranged above the rotary disc in a sliding mode, a stamping die is arranged at the bottom of the stamping disc, and a feeding mechanism is arranged outside the stamping disc. According to the device, feeding, stamping and discharging operation can be completed at the same time, the working time is shortened, the working efficiency of the device is improved, direct contact between the supporting rod and the baffle and a stamping die can be avoided, damage to the baffle is reduced, and the service life of the device can be prolonged.

The present application relates to the technical field of building ceramics, and particularly relates to a positive pressing type integrated dry-pressing formed concave-convex ceramic plate and a manufacturing method thereof. The present application adopts a method of pre-arranging raw materials to match a predetermined molding die of a press, and the arrangement of the powder materials has preliminarily formed a preliminary molding corresponding to the press die before pressing, which can keep the consistency and uniformity of the overall raw materials when being pressed. Compared with the conventional matching of the overall planar arrangement of materials and the molding die, the contact range of the convex position of the die and the overall planar material is denser, and the contact range of the concave position of the die and the overall planar material is relatively lower in density, thereby forming a large difference in density, which is easy to be layered and to produce cracks, and thus the yield is low. The pre-arranged materials and the molding die of the present application can be well matched, and the plate product has the characteristics of high density consistency, high strength and good integration.

The preparation method comprises the following steps: uniformly mixing conductive particles and a dispersant naphthalene sulfonic acid formaldehyde condensate according to a formula ratio, and carrying out primary ball milling to obtain a raw material; adding the raw materials into a ceramic matrix raw material, and carrying out secondary ball-milling treatment to obtain ball-milled slurry; carrying out drying treatment on the ball-milled slurry to obtain mixed powder; polyvinyl alcohol is added into the mixed powder for grinding and granulation, and granulated powder is obtained; the granulated powder is subjected to dry pressing forming treatment, and a dry pressing briquette is obtained; and sintering the dry-pressed briquette in a protective atmosphere to obtain the ceramic resistor substrate.

The application discloses a kind of multi-element rare earth zirconia materials resistant to molten sand dust erosion and a preparation method thereof, and belongs to the technical field of thermal barrier coating materials of aero-engine.The material is ZrO 2、 The main rare earth oxide Y2O3, the auxiliary rare earth oxide A2O3 and B2O3 are used as base raw materials, precisely proportioned, ball-milled and mixed, and a multi-element rare earth zirconia material is synthesized by a high-temperature solid-phase reaction method.The material exhibits the structural characteristics of a defect fluorite phase, is prepared into a dense ceramic block by dry pressing and high-temperature sintering, and has excellent performance, low thermal conductivity and high-temperature stability after its resistance to molten sand dust corrosion is investigated.The material of the application is suitable for application to thermal barrier coating materials of hot-end components of an aero-engine, significantly improves the resistance to high-temperature molten sand dust corrosion and service life of the components.The application solves the technical problems of high thermal conductivity, insufficient resistance to molten sand dust erosion and poor thermal stability of thermal barrier coating materials.

The application discloses a preparation method of high-transmittance Ce:YAG transparent ceramic, and the method comprises the following steps: taking tetraethyl orthosilicate and Al2O3 as raw materials, adding them into an ethanol solution, stirring uniformly at room temperature, heating to obtain a core-shell structure precursor, and washing and drying to obtain a core-shell structure oxide Al2O3@Si; taking Al2O3, Y2O3 and CeO2 as raw material powders, taking each raw material according to the stoichiometric ratio of corresponding elements in a chemical formula (Y 1‑x Ce x )3Al5O 12 Sintering aids, anhydrous ethanol, a dispersant, the core-shell structure oxide and the raw material powders are put into a ball mill tank to obtain a mixed slurry; the mixed slurry is sequentially subjected to drying, sieving, calcining, dry pressing, plastic packaging, sintering, annealing and polishing to obtain the transparent ceramic. The method can fill the grain boundary pores and accelerate the particle rearrangement, improve the sintering activity of the ceramic powder, thereby improving the density of the ceramic, and further improving the transmittance of the ceramic.