212 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 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.

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 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 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 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 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.

The invention discloses a process for preparing 95 aluminum oxide ceramic by using dry pressing and granulation powder tailings. The process comprises the following steps: S1, preparing raw materials; s2, performing pretreatment; s3, adding auxiliary materials; s4, mixing and homogenizing treatment; s5, adjusting and refining treatment; s6, granulating and forming; s7, sintering treatment is carried out; and S8, carrying out post-treatment and detection. According to the method, the tailings generated in the processing process are recycled as raw materials, so that resource waste caused by direct discarding of the tailings is avoided, and cyclic utilization of the materials is realized. The tailings are subjected to pretreatment such as sedimentation, ball milling, sieving and iron removal, and a proper amount of aluminum oxide micro powder is added, so that raw material components are uniform and pure; the dry pressing molding and sintering process are combined to ensure the densification of the green body, so that the prepared 95 aluminum oxide ceramic is superior to the traditional prior art in the aspects of voltage resistance, breaking strength, hardness and appearance quality, and the problems of low voltage resistance, surface stripes and the like of the traditional tailing recycled ceramic are avoided.

This invention discloses a method for preparing silica checker bricks for high-density, low-porosity hot blast stoves, belonging to the field of refractory material preparation technology. The method includes the following steps: raw material selection and pretreatment, optimizing the particle size distribution of silica sand (coarse particles ≤5%, medium particles 70-80%, fine powder 15-20%), and introducing silica brick sand particles and silica fine powder to achieve close packing; batching and mixing, adding mineralizers, fluorite powder, binders, and high-efficiency water-reducing agents in proportion, and mixing until uniform through a specific feeding sequence; semi-dry pressing, using double-sided pressing technology to control the apparent porosity of the brick blank to ≤19.0% and the bulk density to ≥2.10 g / cm³; after drying, using a segmented firing regime, holding at 1420-1450℃ for 18-36 hours to promote the conversion of cristobalite to tridymite, with a residual quartz content ≤1.0%. This invention achieves high density, low porosity, high volume stability, and excellent high-temperature performance of the brick body through particle size optimization, composite additives, and precise firing control.

The invention relates to a manufacturing method of a high-strength metal ceramic alloy, which comprises the following steps: S1, preparing TiO2-Ni-Co-Mo-Cr composite oxide core-shell structure precursor powder through a sol-gel method by taking nano TiO2 powder as a ceramic phase precursor core layer raw material and soluble metal salt as a binding phase precursor shell layer raw material; s2, uniformly mixing the precursor powder with nano carbon black, and carrying out low-temperature pre-nitridation reduction reaction; s3, after the composite powder is granulated, dry pressing preforming is combined with cold isostatic pressing treatment; and S4, degreasing the biscuit, placing the biscuit in a high-pressure sintering furnace in a nitrogen atmosphere, and applying pulse direct current to assist sintering. According to the preparation method, TiN phase synthesis and densification sintering are completely decoupled, low-temperature pre-nitridation is used for completing complete conversion from TiO2 to TiN, a metal binding phase is obtained through synchronous reduction, and a TiN metal core-shell structure is completely reserved; and densification is realized through subsequent low-temperature sintering, so that the problem of abnormal growth of TiN crystal grains caused by superposition of reaction heat release and sintering high temperature in the prior art is effectively avoided.

The invention belongs to the technical field of capacitor dielectric development, and discloses an environment-friendly high-voltage-resistant ceramic capacitor dielectric and a preparation method thereof. The raw materials of the environment-friendly high-voltage-resistant ceramic capacitor dielectric are composed of a base material, an auxiliary agent and a sintering aid, the base material is composed of SrTiO3 and BaTiO3, and the auxiliary agent is composed of Na < 0.5 > Bi < 0.5 > Ta0. 4O2 and BaDy < 0.5 > Nb < 0.5 > O3. The preparation method of the environment-friendly high-voltage-resistant ceramic capacitor dielectric comprises the following steps: (1) mixing the raw materials, performing ball milling, and drying to obtain mixed powder; (2) performing granulation, grinding and dry pressing on the mixed powder to obtain a blank; and (3) sintering the green body to obtain the environment-friendly high-voltage-resistant ceramic capacitor dielectric. The environment-friendly high-voltage-resistant ceramic capacitor dielectric prepared by the invention does not contain lead and cadmium, has excellent frequency stability, high voltage resistance and low dielectric loss, and is suitable for preparing a monolithic ceramic capacitor and a multilayer chip ceramic capacitor.

The invention relates to the technical field of ceramic material preparation, in particular to an integrated anti-static ceramic arm and a preparation method thereof.The preparation method comprises the following steps that S1, powder is prepared, specifically, aluminum oxide powder, auxiliaries, conductive powder, a binding agent, a dispersing agent and ultrapure water are mixed and added into ball milling equipment, and after spray granulation, needed powder is prepared; step S2, performing dry pressing on a green body: filling the powder into a mold, and performing dry pressing to obtain a green body with a required shape; s3, preparing a PE (polyethylene)-based mold core; s4, CNC machining is carried out; s5, cold isostatic pressing forming is carried out; and step S6, sintering to obtain finished ceramic. The integrated anti-static ceramic arm with high surface resistance, good wear resistance and corrosion resistance and long service life can be prepared, the process is simple, and application and popularization are facilitated.

This invention discloses a method and application for in-situ decarburization of SiC nanowires to reinforce dental all-ceramic materials, belonging to the field of biomedical ceramics technology. The method includes the following steps: first, SiC nanowires are prepared by polycondensation and carbothermal reduction using organosilicon and carbon sources as raw materials; then, they are mixed with a dispersion medium, dispersant, PVA solution, and 5Y-PSZ ceramic powder to prepare a composite powder; subsequently, a green body is prepared by spray granulation and dry pressing; finally, the finished product is obtained through atmospheric pressure sintering, decarburization treatment, and secondary sintering. This invention uses SiC nanowires as a precursor, doping and decarburizing 5Y-PSZ to in-situ transform the SiC nanowires into SiO2 nanowires. This achieves crack deflection, bridging, and pull-out strengthening of the nanowires themselves, while simultaneously forming synergistic strengthening with the compressive stress generated by decarburization, significantly improving the mechanical properties of the material. This solves the problems of insufficient strength and mismatch between the nano-reinforcing phase and the matrix interface in materials prepared by existing technologies.

This invention relates to the technical field of tubing, and more particularly to a ceramic-based composite tubing and its preparation method. The ceramic-based composite tubing comprises the following components by weight: 40-60 parts silicon carbide, 20-30 parts clay, 10-15 parts silicon dioxide, 5-15 parts alumina, 5-10 parts silicon powder, and 5-15 parts reinforcing filler, wherein the reinforcing filler is selected from any one or more of carbon fiber, silicon carbide fiber, and carbon nanotubes. The preparation method of the ceramic-based composite tubing includes the following steps: S1, raw material weighing: The raw material is ball-milled and sieved to obtain powdered raw material; the powdered raw material is mixed with clay, dry-pressed, and dried to obtain the material to be sintered; S2, sintering. The combination of alumina and silicon carbide allows silicon carbide to act as a second phase, fixing and strengthening grain boundaries, and shielding cracks, improving the hardness and toughness of the tubing and extending its service life.

The application discloses a kind of curved surface transparent protective ceramic composite protective material and its preparation method, comprising: using dry pressing process preforming, then using cold isostatic pressing process compaction preparation curved surface transparent ceramic body, CNC precision machining after high-temperature sintering, surface polishing, obtain curved surface transparent ceramic;With curved surface ceramic opening upwards fixed, cut good at least two layers of plane glass is placed in sequence on the curved surface transparent ceramic, between each layer of glass and ceramic surface spray silicon dioxide, in oven heating softening closely adhered to the surface of the curved surface transparent ceramic;From top to bottom in order according to organic plate, the multilayer plane glass and the curved surface transparent ceramic each layer between film is glued, the glued vacuum rubber ring is covered and is carried out cold air extraction, is transferred to autoclave after pressurizing and heating, exhaust decompression, remove transparent ceramic composite FH material, cut off surrounding excess film and obtain the vehicle curved surface transparent protective ceramic composite protective material.

The invention relates to the technical field of dry pressing processes, in particular to a dry pressing product and a dry pressing process thereof.The dry pressing product comprises a manually-granulated dry pressing product and a mechanically-granulated dry pressing product, and raw materials of the manually-granulated dry pressing product are composed of 130 parts of dried powder and 7 parts of diluted glue; the raw materials of the machine granulation dry pressing product are composed of 450 parts of dried powder, 11-128 parts of diluted glue, and 357-450 parts of pure water and / or ethanol. The dry pressing process comprises the following steps: 1) preparing slurry and granulating; 2) forming: controlling the dry pressing pressure according to product requirements and material characteristics and controlling the pressure to be 23KN for thin-wall and high-precision products, and 3) glue discharging and sintering: setting the glue discharging temperature to be 550 DEG C and the glue discharging time to be 40h, and setting the sintering temperature to be 1240 DEG C and the sintering time to be 13h. The process disclosed by the invention can improve the performance stability and the production efficiency of the dry pressing products and simultaneously reduce the production cost and the labor intensity.

This application provides a dry pressing method for a self-supporting dry electrode without a current collector, comprising: S1, obtaining an initial attribute dataset and flow simulation basic parameters by analyzing the differences in particle size, density, and flowability of powder in a multi-layer composite structure, simulating and calculating the thickness distribution of each powder in the mold cavity, and determining a uniform distribution prediction model; S2, if the uniform distribution prediction model shows that the thickness deviation exceeds a preset thickness deviation threshold, adjusting the filling sequence parameters to obtain an optimized sequence scheme; S3, simulating the asymmetric compression distribution under the pressing direction, identifying the interface separation risk area, optimizing the powder arrangement to enhance the bonding strength, and obtaining an arrangement configuration that enhances the bonding strength; S4, extracting mechanical strength indicators from the arrangement configuration that enhances the bonding strength, determining the final dry pressing parameter set through iterative verification, generating a pressing path plan for the multi-layer composite electrode, and obtaining a position offset control scheme.