435 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 a microstructure-controllable low-thermal-conductivity double-phase high-entropy ceramic material and a preparation method thereof, and aims to solve the problems that when a pyrochlore-based ceramic material serves for a long time at a high temperature, the thermal insulation effect is insufficient, and the thermodynamic property is reduced due to grain growth. The preparation method comprises the following steps: 1, weighing raw materials according to the chemical formula of (YbxRE1yRE2yRE3yRE4y) 2B2O7; 2, adding a binder and an absolute ethyl alcohol solvent into the raw materials, and carrying out ball milling and mixing; 3, preparing a ceramic green body by adopting a dry pressing molding process; 4, performing high-temperature glue discharging treatment on the ceramic green body; and 5, carrying out solid-phase sintering on the ceramic green body after glue removal. The adopted high-entropy ceramic component comprises at least one element with the radius difference larger than that of Yb ions by 6.9%, severe lattice distortion is induced, a two-phase coexistence region of pyrochlore and fluorite is formed, the heat conductivity of the ceramic material is remarkably reduced, diffusion of the two-phase coexistence region is restrained, and the grain growth rate is reduced.

The invention belongs to the technical field of preparation of boron carbide ceramics, and particularly relates to a method for preparing light boron carbide ceramics by taking coconut shells as raw materials, which comprises the following steps of: performing high-temperature carbonization, crushing, grinding and sieving on the coconut shells as the raw materials to obtain carbon powder, fully evaporating and crosslinking a uniform mixture of the carbon powder, boric acid and trihydroxymethyl aminomethane to obtain gel, and drying the gel to obtain the light boron carbide ceramics. According to the preparation method, the gel is converted into precursor powder by using a combustion method, and finally, the porous boron carbide ceramic is obtained through dry pressing molding and high-temperature sintering, so that the two processes of boron carbide powder preparation and pore forming are integrated, the preparation process flow of the light boron carbide ceramic is effectively simplified, and the efficiency is improved.

The invention belongs to the technical field of porous silicon nitride ceramics, and discloses a porous silicon nitride ceramic material and a preparation method thereof. The preparation method comprises the following steps: mixing silicon nitride ceramic powder, metal oxide powder and rare earth metal oxide powder, adding a pore forming agent and a grinding medium, mixing, and carrying out ball milling, drying, grinding and sieving to obtain ceramic powder; carrying out dry pressing molding on the ceramic powder to obtain a ceramic green body; carrying out glue discharging treatment on the ceramic green body to obtain a precursor; the precursor is subjected to ultrahigh-temperature rapid sintering treatment, and the porous silicon nitride ceramic is obtained; wherein the sintering temperature ranges from 1600 DEG C to 1900 DEG C. According to the porous silicon nitride ceramic prepared by the method, the porosity is wide and adjustable in range, and the porous silicon nitride ceramic with closed spherical pore morphology can be prepared.

The present invention discloses a dry pressing forming equipment for preparing ceramic sheets, belonging to the technical field of dry pressing forming equipment, which comprises: a machine base, a pressing cavity is opened on the top of the machine base, a bottom plate is arranged in the pressing cavity, a ring plate is fixedly installed on the bottom of the bottom plate, and a rotating drum is rotatably installed on the bottom inner wall of the pressing cavity; a pressing mechanism, the pressing mechanism comprises a pressing plate fixedly connected and a fixed frame fixedly connected to the top of the machine base, and a plurality of hydraulic cylinders are fixedly connected to the bottom of the fixed frame; a feeding mechanism, the feeding mechanism comprises a material frame and an electric push rod. The present invention can automatically detect whether the powder is evenly distributed through the cooperation of the push rod and the disc during the pressing and forming of the ceramic sheets, and automatically control the first impact rod and the second impact rod to repeatedly impact the bottom plate in different directions when the powder is unevenly distributed, so that it vibrates and drives the powder to be evenly distributed, thereby ensuring the quality of the pressing and forming of the ceramic sheets, and realizes automatic loading and unloading in cooperation with the feeding mechanism and the material receiving structure.

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 discloses a production process of an aluminum oxide ceramic product. The method comprises the following steps: proportioning raw materials; static pressure forming; sintering and molding; and post-processing. According to the raw material ratio, high-purity aluminum oxide powder is selected as a basic raw material, and the purity of the aluminum oxide powder is not lower than 95%. Adding a proper amount of fluxing agent and additive according to the performance requirement of the required ceramic product; the preparation method comprises the following steps: uniformly mixing the raw materials according to a certain proportion, and carrying out refining treatment by adopting a ball milling process for 8-12 hours, so that the average particle size of the raw material particles reaches 0.5-1.5 microns. The preparation method has the beneficial effects that raw material particles are refined by optimizing a raw material formula and adopting a ball milling process, so that the uniformity and the sintering activity of a green body are improved, and the compactness and the mechanical property of a ceramic product are favorably improved; according to the forming technology combining dry pressing forming and isostatic pressing forming, the density and uniformity of the green body are effectively improved, defects in the green body are reduced, and therefore the yield of products is improved.

The invention discloses a ceramic material for a high-temperature water-oxygen environment and a preparation method of the ceramic material, and belongs to the technical field of environmental barrier coatings. According to the preparation method disclosed by the invention, the Al2O3 modified Yb2Si2O7 powder is prepared into the tablet with a certain size and shape by a dry pressing method, and finally the tablet is sintered into the ceramic material by a pressureless sintering method in the atmosphere, so that the obtained ceramic material for the high-temperature water-oxygen environment can meet the application in the high-temperature water-oxygen environment of 1500 DEG C, has excellent high-temperature environment use performance, and is suitable for being used in the high-temperature water-oxygen environment. And the requirement of a thermal protection component on a C / C composite material high-temperature environment barrier coating is met.

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.

An embodiment of the present invention relates to an all-solid-state battery and an apparatus and method for manufacturing the all-solid-state battery. According to an embodiment of the present invention, a pressing process is performed in a state in which plate-shaped materials and die molds accommodating the plate-shape materials are accommodated in an outer punch mold, and thus it is possible to dry-press a plurality of the plate-shaped materials. Therefore, it is possible to simplify the process of dry-pressing the plate-shaped materials and shorten the required process time.

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 field of iron and steel smelting, and provides a preparation and application method of aluminum-barium-Ca2C refining slag, the method comprises the following steps: S1, obtaining low-nitrogen aluminum ash, cryolite powder, a binder, metal aluminum, metal barium and Ca2C, and uniformly mixing the low-nitrogen aluminum ash, the cryolite powder and the binder to obtain a mixture; s2, the mixture serves as an outer layer material, metal aluminum, metal barium and Ca2C serve as inner layer materials, and refining slag balls are obtained through dry pressing; s3, lime is mixed and added during tapping of the calcium aluminate pre-molten slag converter, molten steel is obtained after tapping is finished, the refining slag balls are added into the molten steel to the surface of the molten steel, soft blowing is carried out, and a steel ladle slag surface is formed; and S4, the refining slag balls and lime are added to the surface of the steel ladle slag again, heating, slagging and desulfurization are conducted, and the alumin-barium-Ca2C refining slag is obtained. The raw materials are simple and extremely easy to obtain, and meanwhile, the adopted low-nitrogen aluminum ash and industrial cryolite are solid wastes of an aluminum factory, so that the pressure of recycling of metallurgical solid wastes is relieved.

The invention discloses a perovskite-type potassium-sodium niobate-based composite ceramic and a preparation method thereof, the perovskite-type potassium-sodium niobate-based composite ceramic is prepared from two kinds of lead-free piezoelectric ceramics, which are 0.965 (K < 0.48 > Na < 0.52 >) (Nb0.955 Sb < 0.045 >) O < 3 >-0.035 (Bi < 0.5 >, Na < 0.5 >) HfO3 and (K < 0.5 > Na < 0.5 >) NbO < 3 >-1% mol Cu, and the two kinds of lead-free piezoelectric ceramics are firstly pre-synthesized into powder and then mixed, dried and sintered to prepare the perovskite-type potassium-sodium niobate-based composite ceramic. The potassium-sodium niobate-based composite ceramic prepared by mixing potassium-sodium niobate-based ceramic powder of two different systems according to different molar ratios, dry-pressing and sintering has excellent piezoelectric property, good temperature stability and good mechanical quality factor, the piezoelectric constant d33 of the potassium-sodium niobate-based composite ceramic is 254 pC / N, kp reaches 0.51, Qm is 173, and Tc is 304 DEG C.

A preparation method for and use of a manganese dioxide doped PZT piezoelectric ceramic. The method comprises: putting PZT and oxide into a ball mill jar, and carrying out wet ball milling on a raw material, alcohol and zirconium balls in proportion for 24 h; placing, in a drying oven for heating, a wet material obtained after ball milling; grinding dry powder, putting the ground dry powder into a corundum crucible with a cover, and pre-sintering same at 850°C for 2 h; carrying out ball milling on the pre-sintered powder for 12 h, drying, granulating with PVA, carrying out dry pressing molding to prepare a disc sample, and removing a binder at 500°C; and sealingly sintering the prepared sample at 850°C-1300°C for 2 h. By using the method, the sintering temperature can be reduced, and the high dielectric properties can be considered.

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 invention relates to the technical field of ceramic mobile phone rear cover processing, in particular to a zirconium oxide ceramic mobile phone rear cover processing technology which comprises the steps that S1, polylactic acid and a hydroxyl silane coupling agent are dissolved in an organic solvent, zirconium oxide powder is added, the temperature is increased to 40-50 DEG C, ultrasonic treatment, filtering and drying are conducted, and pretreated zirconium oxide powder is obtained; s2, banburying the pretreated zirconium oxide powder, zinc oxide, nano cellulose crystal, a first dispersant, a binder and a plasticizer to obtain a mixture; s3, performing dry pressing on the mixture by using a dry press, cooling, and performing isostatic pressing on the mixture in a static press to obtain a blank body; s4, the blank is subjected to glue discharging and sintering, and a ceramic body is obtained; s5, the CNC machine tool is used for conducting precision machining on the ceramic body so that the needed size and shape precision can be achieved; s6, a grinding machine and a polishing machine are sequentially used for conducting fine treatment on the surface of the ceramic body; and S7, carrying out beautifying treatment and anti-fingerprint treatment on the ceramic body subjected to surface treatment to obtain the ceramic mobile phone shell rear cover.

The invention relates to the field of suction cups, and discloses a porous suction cup with gradient-distributed pores and a preparation method of the porous suction cup. Adding glue into the powder and granulating; performing dry pressing and preforming; carrying out secondary cold isostatic pressing molding; discharging glue and sintering; and finish machining to obtain a final product. The prepared porous sucker with the gradient-distributed pores has the advantages that the porosity gradient is controllable, and the adsorption effect is maximized, under the same negative pressure condition, the higher the porosity of the material is, the larger the pore diameter is, the larger the generated adsorption force is, and the multi-formula powder is integrally formed in a regional mode, so that the production efficiency is greatly improved. The content of the pore-forming agent and the particle size of the low-activity aluminum oxide in the formula are gradually adjusted from the inner ring to the outer ring, so that the porosity and the pore diameter of each area of the sintered green body are regulated and controlled, and the porosity of the inner ring and the outer ring of the suction cup can be regulated and controlled in a stepped manner within the range of 15-50% and the pore diameter of 10-100 microns; and the problem that the edge of the wafer is easy to deform due to insufficient edge adsorption force is avoided.

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 discloses a dry granulation method and device for silicon-containing powder or silicon-containing fine particles, and relates to the related field of powder granulation, and the method comprises the following steps: collecting the silicon-containing powder or silicon-containing fine particles into a storage device to obtain a silicon-containing material; the silicon-containing material is quantitatively conveyed into the lifter through the regulator; the lifter lifts the silicon-containing material from the first height to a second height; quantitatively conveying the silicon-containing material at the second height into a material pressing device through a feeder; the material pressing device is used for carrying out dry-method pressing granulation on the silicon-containing material and outputting metal silicon hard particles; the metal silicon hard particles are screened through the screening device, finished silicon hard particles are output, and screened dust is conveyed to the bottom of the lifter to be recycled. The technical problems of resource waste and value reduction loss existing in existing silicon-containing powder or fine particle recovery treatment are solved, and the technical effects of achieving maximum utilization of resources and reducing the value reduction loss are achieved.

The invention discloses a metal ceramic composite structure membrane and a preparation method and application thereof, and belongs to the technical field of composite membrane preparation. The method comprises the following steps: firstly, cutting a foam metal net to a target size, ultrasonically cleaning and drying; then dipping in slurry containing a metal oxide, and airing to obtain a porous metal net of which the surface is covered with the metal oxide; mixing the ceramic powder with a solvent and an adhesive to prepare ceramic powder slurry; and filling pores of a porous metal net with the mixture in a vacuum filtration manner, airing, carrying out dry-pressing molding, and sintering in an inert atmosphere containing hydrogen. According to the prepared metal ceramic composite structure film, on the premise that metal communication is kept, the metal phase volume ratio (lt) is reduced to the maximum extent; the metal ceramic composite structure has high mechanical strength and has a good application prospect in the aspect of mixed conductor membrane reactors due to the fact that the metal ceramic composite structure has high mechanical strength, and the function of a ceramic phase (such as conduction of oxygen ions, protons and the like) is enhanced.

The invention relates to a lithium fluoride ceramic target material and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing lithium fluoride and a binder solution to obtain a precursor, carrying out mold pressing or dry pressing molding on the precursor, and then carrying out cold isostatic pressing molding to obtain a biscuit; carrying out pressureless sintering on the biscuit to obtain a sintered body, and carrying out HIP post-treatment on the sintered body to obtain a lithium fluoride ceramic target material; according to the method, under the condition that no sintering aid is introduced, the defects such as pores in the grain boundary area of the sintered body are removed by adding the HIP post-treatment process, and the lithium fluoride ceramic target material with relatively high density is obtained. The high-density lithium fluoride ceramic target material can be obtained by adopting a mode of combining pressureless sintering and HIP post-treatment, and the density of the lithium fluoride ceramic target material prepared by the method is 97%-99%.

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 composite ceramics, and discloses a CoSi2 alloy toughened high-entropy carbide composite ceramic as well as a preparation method and application thereof. The composite ceramic is (Ti0. 2Zr0. 2Nb0. 2Ta0. 2Mo0. 2) C-CoSi2, and is prepared by the following steps: mixing TiO2 powder, ZrO2 powder, Nb2O5 powder, Ta2O5 powder, MoO3 powder and carbon powder to obtain mixed powder, adding the mixed powder into absolute ethyl alcohol, stirring to obtain slurry, carrying out ball milling, drying and sieving, carrying out dry pressing to obtain a green body, sintering at 1000-1600 DEG C in a protective atmosphere, mixing the prepared high-entropy powder and CoSi2 powder, carrying out ball milling, drying and sieving, and carrying out dry pressing to obtain a green body; the composite ceramic is prepared through SPS sintering under the uniaxial pressure of 25-30 MPa and at the temperature of 1500-1700 DEG C. The composite ceramic has the advantages of high density, high hardness, high fracture toughness and the like, and can be applied to the field of preparation of materials difficult to cut.

The preparation method comprises the following steps: performing by adopting a dry pressing process, compacting by adopting a cold isostatic pressing process to prepare a curved-surface transparent ceramic biscuit, sintering at high temperature, performing CNC (Computer Numerical Control) precision machining, and polishing and grinding the surface to obtain curved-surface transparent ceramic; fixing the curved-surface transparent ceramic with the opening facing upwards, overlapping at least two layers of cut plain glass on the curved-surface transparent ceramic in sequence, spraying silicon dioxide between every two layers of glass and on the surface of the ceramic, and heating and softening in a bending furnace to be tightly attached to the surface of the curved-surface transparent ceramic; sequentially laminating the organic plate, the plurality of layers of plain glass and the curved transparent ceramic from top to bottom according to the adhesive sheets between the layers, sleeving the laminated sheets with a vacuum rubber ring, carrying out cold air pumping, transferring the laminated sheets into a high-pressure kettle, pressurizing and heating, exhausting and reducing pressure, and taking out the transparent ceramic composite FH material, so as to obtain the transparent ceramic composite FH material. And cutting off redundant films around to obtain the curved-surface transparent protective ceramic composite protective material for the vehicle.

The invention discloses a preparation method of a high-volume-resistivity electrostatic chuck aluminum nitride ceramic plate, and belongs to the technical field of electrostatic chucks, the method comprises the following steps: raw material preparation: aluminum nitride powder, an oxide dopant and an organic additive are used as raw materials, the oxide dopant comprises 0.1-1 wt% of SiO2, 0.1-1 wt% of TiO2, 0.1-5 wt% of Y2O3, 0.1-2 wt% of CaO, 0.1-2 wt% of MgO and 0.1-2 wt% of BaO, the organic additive is added into the aluminum nitride powder, and the organic additive is added into the aluminum nitride powder; the organic additives comprise a solvent, a dispersing agent and a binder; the raw materials are subjected to mixing and ball milling for 4-8 h through a planetary ball mill, the ball milling rotating speed is 350-450 r / min, and the ball milling temperature is 25-30 DEG C; forming: forming by adopting a dry pressing forming method or a tape casting forming method; glue discharging: the highest temperature of glue discharging is 500-600 DEG C; sintering: adopting double-shaft pressurized nitrogen hot pressed sintering, keeping the highest temperature of the ceramic body at 1600-1800 DEG C for 2-8 hours, and keeping the pressure at 5-30 Mpa.

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.

The present invention discloses a large-size alumina ceramic forming method, aiming to solve the problem that it is difficult to successfully form long strips with long sizes and certain internal features by dry pressing or cold isostatic pressing. The invention includes the following steps: S1, mixing alumina powder, dispersant and water to obtain a mixed slurry; S2, placing the mixed slurry in a vacuum degassing machine for vacuum degassing to remove bubbles in the mixed slurry; S3, loading the mixed slurry into a pressure grouting machine; S4, injecting the mixed slurry into a porous resin mold through the pressure grouting machine for continuous pressure molding; S5, drying after demoulding to obtain a ceramic green body; S6, loading the ceramic green body into a sintering furnace for firing and molding. This patent application uses pressure grouting to form ceramic products, which can form ceramic products with large sizes and internal features, overcoming the current situation that large-size products are difficult to form and internal features are difficult to process.