1200 results about "Green body" patented technology

The invention belongs to the technical field of architectural ceramics, and particularly relates to a tempered high-strength impact-resistant ceramic sheet and a preparation method thereof. The toughened high-strength impact-resistant ceramic thin plate comprises a ceramic thin plate blank and a toughened coating which is arranged on the surface of the ceramic thin plate blank and is obtained by firing toughened coating slurry. A ceramic sheet reinforcing process is developed by referring to a stress structure of tempered glass, and the impact resistance and the bending strength of the material are remarkably improved by establishing the pressure stress layer on the bottom surface of the green body and cooperating with the pressure stress layer of the glaze layer, so that the application field of the ceramic sheet is widened.

The invention provides a method for preparing a high-performance silicon nitride ceramic ball based on a pressure modulation sintering technology, and relates to the field of functional ceramic material preparation, and the method comprises the following steps: 1, preparing a green body; 2, PMS sintering is carried out; step 3, cooling; traditional high-performance silicon nitride ceramic balls (the relative density is required to be larger than 99%, the Vickers hardness is required to be larger than or equal to 1500 kgf / mm, the bending strength is required to be larger than or equal to 920 MPa, and the fracture toughness is required to be larger than or equal to 6.0 MPa.m / ) are mainly prepared through a two-step process of normal pressure / air pressure sintering (GPS) and hot isostatic pressing (HIP). Although high densification of the material can be realized, the method has the problems of complicated process flow, high energy consumption, long production period, high equipment occupancy rate and the like.

The invention relates to the technical field of electrode paste, in particular to electrode paste for a submerged arc furnace and a preparation method of the electrode paste. Comprising three-level grain size distribution anthracite aggregate which is electrically calcined at high temperature and modified by a KH-550 silane coupling agent, a modified silicon carbide whisker and boron-doped graphene-like carbon nitride composite filler, a maleic anhydride-mediated compatible medium-temperature pitch-polyborosiloxane binder and a graphite powder-borax functional additive. A step-by-step mixing and two-stage sintering process is adopted in the preparation process, a covalent bond interface bridging structure is constructed through the coupling agent, the composite dispersing agent regulates and controls the multi-dimensional network distribution of the filler, and the process synergistically improves the compactness and the interface bonding force of the green body. The electrode paste is firm in interface bonding, can form a ceramic protective phase at a high temperature, has excellent conductivity and mechanical strength, and prolongs the service life of the electrode paste for the submerged arc furnace.

The invention discloses an aluminum-based composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing powder of an intermediate alloy, a simple substance metal and a reinforcement with a binder, and carrying out cold pressing to form a green body; degreasing and sintering the green body to obtain a sintered part; and heating the sintered part, performing closed die forging, performing heat treatment and fine trimming to obtain a finished product, and if the performance does not meet the requirements, performing hot extrusion on the sintered part, and performing heat treatment and fine trimming to obtain the finished product. Oxide is removed through ball milling, the surface of the Al-Mg powder is activated, and passivation is protected through a binder; a reinforced phase SiC is designed to be blended with a binder, and then the mixture is mixed with other powder to form a specific microstructure; low-melting-point Sn is introduced to limit the sintering temperature, element diffusion is promoted through a liquid phase, and generation of a harmful intermediate phase is avoided; a sintered part with the density being 80-95% is adopted, a low-strain soft area is formed around a reinforced phase in cooperation with a specific microstructure, deformation coordination is improved, meanwhile, the peak aging time of the aluminum alloy is prolonged through SiC, the electric conduction and heat conduction performance is improved, and the comprehensive performance of the composite material is comprehensively improved.

The invention relates to the technical field of ceramic materials, in particular to a preparation method of a diatomite-based porous ceramic material and application of the diatomite-based porous ceramic material in wastewater pollutant treatment. The preparation method of the diatomite-based porous ceramic material comprises the following steps: mixing a basic raw material, a sintering aid, a pore forming agent and a binder, performing compression molding to obtain a green body, and sintering the green body, the basic raw materials comprise 80-85% of diatomite, 5-10% of kaolin, 0-5% of feldspar and 5-10% of sodium silicate; the mass of the sintering aid is 5% higher than that of the basic raw material; the mass of the pore-forming agent is 25-45% of that of the basic raw material, and the pore-forming agent is selected from one or more than two of crystalline flake graphite, polymethyl methacrylate and spherical graphite. By controlling the composition and dosage of the basic raw materials, the sintering aid and the pore-forming agent, a micro-nano hierarchical pore structure is formed, mechanical properties and permeability are improved at the same time, and good filtration and interception performance on pollutants in wastewater is achieved.

The spherical four-glued prism is formed by gluing and connecting three triangular prisms and a curved prism, each gluing surface is plated with a functional film, each non-gluing surface is plated with an anti-reflection film, the outer diameter position of the curved prism is coated with black extinction paint, and the outer diameter position of the curved prism is coated with the black extinction paint. The curved prism can be arranged on any side of the three triangular prisms; the processing technology of the spherical four-cemented prism comprises the following steps: 1) preparing a light blank; 2) plating a first light splitting film, combining, polishing, plating a second light splitting film, combining and polishing in sequence; the method comprises the following steps of (1) preparing a curved prism, (2) cutting the curved prism to form a green body with a specified size, (3) cutting to form a green body with a specified size, (4) pasting an auxiliary lens, (5) processing a spherical surface, (6) removing the auxiliary lens, and (7) plating an antireflection film on the spherical surface, and coating the outer diameter of the curved prism with black matting paint The prism prepared by the method is compact in structure, excellent in performance, high in processing precision and small in gluing deviation, and can realize low-cost and batch production and universalization of a jig at the same time.

The invention discloses a reversible metal 4D printing method based on hydrogel reversible deformation and a metal part, and belongs to the field of metal additive manufacturing. The method comprises the following steps: firstly, constructing a three-dimensional model comprising a hydrogel driving layer and a metal blank layer; respectively preparing hydrogel light-cured ink and metal or precursor slurry thereof; printing the two layers of materials sequentially or alternately by adopting a photocuring printer to obtain a composite green body; the hydrogel layer is dehydrated and shrunk through drying, the component is driven to generate preset shape deformation, the hydrogel layer absorbs water and expands through soaking, and reversible recovery of the shape of the component is achieved; and degreasing, selective reduction and sintering heat treatment are conducted on the component, and the compact final metal component is obtained. According to the invention, the independent hydrogel layer is used as a deformation driver, the dependence on the intrinsic phase change characteristic of a metal material is avoided, the material universality is extremely high, the method can be widely applied to 4D printing of various materials including refractory metal and high-reflection metal, and reversible control of shape change is realized.

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

The invention relates to the field of inorganic ceramic materials, in particular to a high-thermal-conductivity silicon nitride ceramic substrate and a preparation method and application thereof. The preparation method of the high-thermal-conductivity silicon nitride ceramic substrate comprises the following steps: obtaining at least two kinds of silicon nitride slurry with different total contents of sintering aids, and respectively molding the silicon nitride slurry into green sheets; stacking the at least two green body sheets according to a preset lamination sequence and spatial orientation to obtain a laminated green body with a sintering aid concentration gradient; and sintering the laminated green body to obtain the high-thermal-conductivity silicon nitride ceramic substrate. According to the method, additional seed crystal or complex atmosphere accurate regulation and control are not needed, directional driving force is spontaneously formed in the sintering process through material intrinsic gradient design and laminated structure construction, silicon nitride crystal grains are effectively induced to grow in a preferred orientation mode in the preset direction, therefore, directional arrangement of the crystal grains is controllable, the process is simple and stable, repeatability is good, and the method is suitable for industrial production. The thermal conductivity, the bending strength and the fracture toughness of the prepared silicon nitride ceramic substrate are synchronously optimized.

The invention discloses daily high-strength environment-friendly ceramic and a preparation process thereof, and particularly relates to the field of ceramic materials, and the preparation process comprises the following steps: S1, preparation and molding of green body powder, S2, preparation of multifunctional glaze slip, and S3, glazing and sintering. By introducing the pre-compounded reinforced fiber, the SiO2-Al2O3 coating on the surface of the pre-compounded reinforced fiber and the ceramic matrix form strong interface bonding at high temperature, so that the comprehensive mechanical property of the green body is improved, the load is effectively transmitted and dispersed, and meanwhile, the fiber has remarkable toughening and impact resisting effects; due to the addition of the biomass derived porous carbon powder, the fracture toughness and thermal shock resistance of the material are further improved through the pore-forming and buffering effects of the biomass derived porous carbon powder; while high bending strength is maintained, impact toughness is improved in a breakthrough manner, and the composite material is more suitable for collision scenes in daily use.

The invention relates to the technical field of carbon material preparation, and discloses a preparation method of high-density low-porosity isostatic pressing graphite, which comprises the following steps: preparation of composite powder: mixing carbon aggregate, a transient liquid phase forming agent, a temporary binder and a high-temperature volatile pore net stabilizer to obtain the composite powder; performing cold isostatic pressing, namely performing cold isostatic pressing on the composite powder to obtain a green body; synergistic densification roasting: carrying out two-stage roasting on the green body in an atmosphere to obtain a high-density roasted blank; wherein the second heating rate of the first stage is higher than the first heating rate of the second stage; graphitization: carrying out high-temperature graphitization treatment on the high-density roasted blank to obtain a finished product. According to the method, the high-temperature volatile pore net stabilizer and the transient liquid phase forming agent are utilized, and a two-stage dynamic heating roasting scheme is matched, so that time sequence collaboration of pore supporting and liquid phase filling is realized.

The present application relates to a kind of luxury stone ceramics and its preparation method, belong to ceramic production manufacturing technical field.The preparation method of the luxury stone ceramics includes: glaze is applied on the surface of green body;After glaze is applied on the surface of green body, matt color glaze is applied;After matt color glaze is applied on the surface of green body, inkjet printing is printed on the surface of green body;After inkjet printing is printed on the surface of green body, whitening glaze is applied;After whitening glaze is applied on the surface of green body, color inkjet printing is printed;After color inkjet printing is printed on the surface of green body, number code protection glaze is applied;After number code protection glaze is applied on the surface of green body, it is fired and polished, and the luxury stone ceramics is obtained.The present application can highly restore the luxury stone color and detail of various different textures, and production process stability is good.

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

The invention belongs to the technical field of fishpond filtering materials, and discloses a preparation method of a fishpond filtering composite carbon material and the fishpond filtering composite carbon material. The preparation method of the fishpond filtering composite carbon material comprises the following steps: 1) performing kneading and extrusion molding treatment on mixed powder comprising modified bentonite, biomass powder, diatomite, a pore forming agent and a photocatalyst and a binder solution to obtain a green body; 2) drying the green body, performing multi-section programmed heating carbonization in an inert atmosphere, and cooling to obtain a porous carbon ceramic framework loaded with a photocatalyst; 3, the porous carbon ceramic framework is soaked in the graphene oxide dispersion liquid, and the fishpond filtering composite carbon material.The fishpond filtering composite carbon material is obtained.The preparation temperature is relatively low, the fishpond filtering composite carbon material has a developed macropore-mesopore-micropore graded pore structure, and efficient physical adsorption, photocatalytic degradation and microbial biofilm culturing functions can be achieved at the same time.

The invention discloses a gallium-cerium co-doped ITO target material and a preparation method thereof, and belongs to the field of transparent conductive oxide ceramic target materials, and the preparation method comprises the following steps: weighing indium oxide powder raw materials, tin oxide powder raw materials, gallium oxide powder raw materials and cerium oxide powder raw materials in proportion, and performing pretreatment; the raw material powder is subjected to independent ball milling till the raw materials reach the preset particle size; mixing the four kinds of slurry, and continuously performing ball milling to obtain uniform mixed slurry; adding a binder into the mixed slurry, and carrying out ball milling and mixing to form stable formed slurry; carrying out spray granulation on the formed slurry to obtain spherical precursor powder; pressing and forming the precursor powder to obtain a biscuit, then putting the biscuit into a sintering furnace, carrying out stepped sintering in an oxygen atmosphere, and naturally cooling to obtain the gallium-cerium co-doped ITO target material. According to the gallium-cerium co-doped ITO target material prepared by the method, the relative density is greater than or equal to 99.4%, the resistivity is less than or equal to 99.4%, and the three-point bending strength is greater than or equal to 230MPa.

The invention relates to the technical field of preparation of silicon carbide ceramics, in particular to an in-situ reaction sintered silicon carbide ceramic and a preparation method thereof.The preparation method comprises the following technological stages which are conducted in sequence: S1, preparation of silicon carbide slurry, specifically, organic matter precursor raw materials are weighed according to the mass content percentage to form the silicon carbide slurry; s2, vacuum grouting: injecting the silicon carbide slurry in the vacuum grouting tank into the shaping mold from the bottom of the shaping mold to form a silicon carbide green body; and S3, in-situ reaction sintering is conducted, specifically, the silicon carbide green body is placed in a sintering furnace, heating, heat preservation and cooling are conducted on the silicon carbide green body in the argon atmosphere through a segmented temperature control technology, and the silicon carbide ceramic is obtained. The silicon carbide ceramic prepared by the method disclosed by the invention has relatively high density and excellent mechanical properties.

The invention discloses a multi-component magnesium refractory aggregate using copper slag flotation tailings as raw materials and a preparation method thereof, the multi-component magnesium refractory aggregate is obtained by using copper slag flotation tailings powder, light-burned MgO powder, magnesite powder and alpha-Al2O3 powder as raw materials through compression molding and calcination. The preparation method comprises the following steps: mixing the copper slag flotation tailing powder, the light-burned MgO powder, the magnesite powder and the alpha-Al2O3 powder in a mixer to obtain mixed powder; adding a binding agent solution into the mixed powder, and performing mechanical pressing to obtain a green body; and heating the formed green body to 950-1150 DEG C, preserving heat for 4-6 hours, finally heating to 1480-1580 DEG C, preserving heat for 4-6 hours, cooling, crushing, and screening to obtain the multi-component magnesium refractory aggregate. According to the method, the copper slag flotation tailing powder is used as the raw material, resource utilization of the copper slag flotation tailings is achieved, and the obtained multi-component magnesium refractory aggregate is suitable for a cement rotary kiln.

A method to solidify cremation remains includes milling the cremation remains to a reduced particle size, adding water to the cremation remains to produce a mixture; shaping the mixture into wet ware having a desired shape, drying the wet ware to greenware that is sufficiently dry for firing, and firing the greenware in a kiln until solidified to one or more cremains solids consisting of the cremation remains. A product formed of solidified cremation remains is also disclosed.

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

The invention relates to the technical field of layered products, and particularly discloses a heat-insulating and wave-absorbing skin material as well as a preparation method and application thereof. The heat-insulating and wave-absorbing skin material is of an integrated layered structure based on an aluminum oxide-mullite system, comprising a functional gradient layer with double gradients of fiber density and aperture, an impedance matching layer with a gradient dielectric constant, a resonance wave absorbing layer with a periodic dot matrix formed by silicon carbide and aluminum oxide core-shell microspheres, and a heat insulation layer with a nano-micron double-scale pore structure. According to the preparation method, a green body is constructed mainly through tape casting and silk-screen printing, and then co-sintering integrated forming is carried out. The material has the excellent characteristics of high temperature resistance, toughness, efficient heat insulation, broadband wave absorption and the like, and is suitable for extreme environments such as hypersonic aircraft skin and the like.

The invention belongs to the technical field of additive manufacturing, and particularly relates to a diamond / copper radiator manufacturing method based on 3D printing, and the diamond / copper radiator manufacturing method comprises the steps that diamond / copper composite powder is prepared, and the composite powder comprises diamond particles with nano alloying elements attached to the surfaces and spherical copper powder; and under shielding gas, green laser with the wavelength of 532 nm is adopted for conducting selective laser melting scanning on the composite powder, meanwhile, high-frequency ultrasonic vibration is applied to a molten pool in a laser acting area, and a diamond / copper composite material radiator green body is formed through layer-by-layer powder laying, scanning melting, ultrasonic assistance and layer-by-layer accumulation. Copper matrix crystal grains are refined through ultrasonic energy, residual stress in the printing process is reduced, generation of microcracks is effectively restrained, the mechanical property and reliability of a workpiece are improved, the high absorptivity of green laser to copper and the technical advantages of 3D printing are combined, and high-quality 3D printing is achieved. And the radiator with fine structures such as complex three-dimensional micro-channels and ultrathin fins can be integrally manufactured.

The invention relates to a self-heating silicon carbide ceramic separation membrane and a preparation method thereof. A separation membrane layer is directly heated and sintered by utilizing the self-heating characteristic of a silicon carbide support body. The preparation method comprises the following steps: pretreating a silicon carbide support body, putting the silicon carbide support body into ethanol and an acidic or alkaline solution for ultrasonic cleaning, cleaning with deionized water until the silicon carbide support body is neutral, and drying; the preparation method comprises the following steps: preparing separation layer slurry, uniformly dispersing a binder in a solvent, adding ceramic powder and a dispersant according to a certain ratio, and carrying out ball-milling mixing, defoaming and vacuum defoaming to obtain uniform bubble-free slurry. Coating a separation layer, coating the slurry on the surface of a silicon carbide support body, and drying in a drying oven to obtain a separation layer green body; roasting the separation layer, putting the green body into a self-heating furnace clamp, connecting stable current sources to two ends, accurately controlling the temperature through a voltage meter, an ampere meter and an automatic temperature control instrument by utilizing the high resistance characteristic of silicon carbide, realizing self-heating of the support body, rapidly sintering the separation layer, and naturally cooling to obtain the product. An external heat source is not needed, the process is simplified, the period is shortened, and a new scheme and a technical path are provided for preparation of the silicon carbide ceramic separation membrane.

The invention belongs to the technical field of drinking water purification materials, and discloses a drinking water difunctional filtering carbon material which is capable of efficiently removing heavy metals, high in mineral substance retention rate and high in safety, and a preparation method and application of the drinking water difunctional filtering carbon material. The preparation method comprises the following steps: (1) mixing a primary carbonized material, a binder, a pore forming agent and a transition metal salt solution, kneading and forming, and drying to obtain a green body; (2) sequentially carrying out secondary carbonization treatment and thermal activation treatment on the green body, cooling, washing with water until the conductivity of a washing solution is constant, and drying to obtain a porous carrier; (3) immersing the porous carrier in the oxidation modification solution, carrying out solid-liquid separation, washing with water, and drying to obtain a porous oxidation carrier; and (4) immersing the hot porous oxidation carrier in the alkaline polyamine modified solution, adjusting the pH value of the mixture to be close to neutral when the temperature is reduced to room temperature, carrying out solid-liquid separation, and carrying out heat treatment to obtain the drinking water dual-function filtering carbon material, wherein the temperature of the porous oxidation carrier is higher than that of the alkaline polyamine modified solution.

The invention discloses a 2: 17 type rare earth soft magnetic / Fe-based soft magnetic laminated composite material and a preparation method thereof. The method sequentially comprises the following steps: 1) screening 2: 17 type rare earth soft magnetic powder, performing insulation coating, mixing with polyurethane, and performing magnetic field orientation to obtain a thin ring green body; (2) Fe-based soft magnetic powder is sieved and mixed with polyurethane, and then a thin ring green body is obtained through magnetic field orientation; (3) alternately stacking the 2: 17 type rare earth soft magnetic thin ring green bodies and the Fe-based soft magnetic thin ring green bodies in the direction perpendicular to the plane of the thin ring green bodies; and 4) carrying out hot press molding on the laminated soft magnetic composite material. Based on the high-frequency characteristic of the 2: 17 type rare earth soft magnetic material and the high magnetic conductivity characteristic of the Fe-based soft magnetic material, collaborative optimization of the magnetic conductivity and the cut-off frequency is achieved within the ultra-wideband range from MHz to GHz, the problem that the magnetic conductivity of a traditional soft magnetic composite material is attenuated along with the frequency is effectively solved, high-frequency loss is greatly reduced, and the service life of the soft magnetic composite material is prolonged. And a solution is provided for high-frequency soft magnetic components (such as inductors and transformers) with high magnetic performance and low power consumption.

The invention belongs to the technical field of ceramic composite substrate processing, and discloses a high-strength and high-thermal-conductivity aluminum nitride ceramic composite substrate preparation device which comprises a preparation assembly, driving assemblies are arranged on the front side and the rear side of an inner cavity of the preparation assembly correspondingly, a discharging table is arranged on the inner sides of the driving assemblies, and a clamping structure is hinged to the outer side of the discharging table; a feeding mechanism and a discharging mechanism which are located below the discharging table are arranged on the two sides of the preparation assembly correspondingly. Through the arrangement of the connecting rod and the corrugated block, when the driving assembly operates, the whole discharging table is driven to move upwards through the transmission chain, the connecting rod is driven to move to the outer side of the corrugated block, then the corrugated block extrudes the connecting rod and drives the connecting rod to move in a reciprocating mode, and meanwhile the connecting rod drives the movable block to move; and the whole supporting frame is driven to rotate, so that the green body rotates on the inner side of the heating plate, the green body is uniformly sintered, and flaws are avoided.

The present invention relates to the technical field of ceramics. Disclosed are a ceramic tile having a velvety texture and a replicated natural stone effect and a preparation method therefor. The ceramic tile comprises a green body layer, a surface glaze layer, a pattern texture layer, a digital deep-engraving ink layer, and a dry grain glaze layer which are sequentially arranged from bottom to top. The digital deep-engraving ink layer is composed of a digital matte deep-engraving ink. The dry grain glaze layer is composed of a dry grain glaze. A surface tension difference is formed between the digital matte deep-engraving ink and the dry grain glaze. By means of the improvement of the digital matte deep-engraving ink, the digital matte deep-engraving ink can bind with the dry grain glaze and achieve a matte three-dimensional non-collapse effect on the glaze surface. By means of the improvement of the dry grain glaze, the dry grain glaze exhibits better physical properties. By means of the improvement of a suspending agent, the suspending agent can achieve relatively strong binding affinity with dry grains, thereby imparting stronger polarity to the dry grain glaze, and when the dry grain glaze binds with the digital matte deep-engraving ink having high hydrophobicity, sufficient repulsive forces can be formed, resulting in the formation of a more refined and three-dimensional relief effect.

Provided are a lithium disilicate glass-ceramic green body, a preparation method therefor, and a use thereof. The lithium disilicate glass-ceramic green body comprises a lithium disilicate main crystal phase, crystal size in the lithium disilicate glass-ceramic blank being between 50 and 400 nm, and the proportion of the area of crystal grains having a length greater than 350 nm to the total area being less than 30%. The present disclosure, by means of controlling the internal crystal size of the lithium disilicate glass-ceramic green body to be below 400 nm, enables same to be directly machined without damaging the machining equipment, and combines the advantages of high strength, machinability and direct coloration. This can reduce the waiting time for patients to receive dental restorations, solve the problem of patients being unable to know the color of all-ceramic dentures before fabrication, and overcome a bottleneck for all-ceramic denture restoration materials for same-day delivery. It has great significance for achieving preoperative color matching and rapid restoration in clinical practice.

The application discloses a packaging structure with a selective copper-coated and chip-integrated unit and a preparation method thereof, and relates to the technical field of electronic packaging. The preparation method comprises the following steps: patterning a ceramic substrate, and attaching a first green body layer and a second green body layer to the surface of a first metallized layer of the patterning ceramic substrate and the surface of a heat dissipation plate, respectively; the first green body layer and the second green body layer are composed of solid-state diffusible metal particles, the conductive circuit area is stacked with a copper sheet through the first green body layer, the chip attaching area is stacked with a chip through the first green body layer, and bagging, sealing and sintering are performed. The four process steps of patterning a ceramic substrate, attaching a chip, copper-coating a conductive circuit and integrating a substrate and a heat dissipation plate are integrated into a one-time pressure sintering process, integrated packaging is realized, the packaging process is simplified, the production efficiency is improved, the thermal stress control is excellent, and the device performance and reliability are improved.

The present application provides a method for preparing ceramic paving stone products by using large amount of decarburized coal gangue, and relates to the technical field of coal gangue resource utilization, which comprises the following steps: decarburizing and color selecting the coal gangue to obtain high-aluminum light-gray decarburized coal gangue, high-silicon gray-black decarburized coal gangue and / or high-iron calcium red-brown decarburized coal gangue; two or more of the coal gangues are proportioned according to the proportion suitable for ceramics, and a composite fluxing agent and / or a lignin additive are selected; after being pressed into a green body, the mixture is fired at 1150-1170 DEG C for 15-20 minutes, and then cooled to obtain a ceramic product with a high total amount of coal gangue; or a high-grade light-color ceramic can be prepared by mixing 40% of single light-gray decarburized coal gangue. The method realizes the high-mixing application of coal gangue in ceramics, and significantly improves the stability and economy of the product by using the composite fluxing agent in cooperation with plasticity enhancement while reducing the firing temperature.

The invention belongs to the technical field of graphite metal composite materials, and provides a high-heat-flux graphite-based heat conduction core material, a preparation method thereof and a solid temperature uniformizing plate, and the preparation method comprises the following steps: forming a plurality of micron-sized blind holes in the surface of a graphite film, and processing a plurality of through holes in the graphite film; sequentially depositing an active metal film and a heat-conducting metal film on the surface of the graphite film to obtain a coated graphite film; stacking and aligning a plurality of layers of coated graphite films, enabling the through holes in each layer to be communicated to form a plurality of channels, and filling metal powder in the channels to form a graphite-metal composite green body; and performing vacuum hot pressing to melt the metal powder to form a metal column penetrating through multiple layers, so as to obtain the graphite-based heat-conducting core material. The graphite-based composite material for the vapor chamber prepared by the method has the advantages of high thermal conductivity, high thermal conductivity, high mechanical strength and excellent weldability.