6287 results about "Ceramic" patented technology

The invention relates to the technical field of ceramics, and particularly discloses a preparation method of a bamboo charcoal pot ceramic material, which comprises the following steps: weighing the following raw materials in parts by weight: 25-30 parts of bamboo charcoal powder, 20-25 parts of quartz powder, 10-15 parts of silicon carbide, 10-14 parts of a whisker readjustment-based bonding agent, 8-12 parts of albite, 7-11 parts of a magnesium oxide-doped modified filling agent and 5-10 parts of clay. According to the bamboo charcoal pot ceramic material disclosed by the invention, the bamboo charcoal powder is matched with the quartz powder, silicon carbide, albite and clay raw materials, and the impact resistance, the heat-conducting property and the wear-resisting property of the product are harmoniously improved by adding the continuous balance agent based on whisker readjustment and the filling agent modified by doped magnesium oxide and blending and matching the raw materials; and the product has remarkable cold and heat resistance and scrubbing stability.

The invention relates to a preparation method of a carbide ceramic reinforced high-temperature alloy, and belongs to the technical field of additive manufacturing. The preparation method comprises the following steps: taking a high-temperature alloy as a matrix, and then adding carbide ceramic to prepare the composite material; the method comprises the following steps: mixing carbide ceramic powder with high-temperature alloy powder; the carbide ceramic is TiC, HfC or NbC; the high-temperature alloy is a CoNiCrW series high-entropy alloy or a NiCrWMo series medium-entropy alloy; the particle size of the carbide ceramic powder is 40-80 microns; the particle size of the high-temperature alloy powder is 40-90 microns; the composite material is prepared through an additive manufacturing process. The W element in the high-temperature alloy powder diffuses towards the surface of the carbide ceramic to form a thin interface layer, so that the interface bonding force between a matrix and the carbide ceramic phase can be ensured, the compatibility between the high-temperature alloy matrix and the carbide ceramic is improved, the interface cracking risk is effectively reduced, and the metallurgical quality of a composite material is greatly improved.

The present disclosure is directed to nanocomposites comprising a co-sintered composition of a MXene crystal form composition and an inorganic oxide, or oxide-type ceramic and methods of making and using the same.

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

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

The invention discloses a negative temperature coefficient medium-entropy thermistor material as well as a preparation method and application thereof. According to the invention, manganese dioxide, nickel oxide, cobalt sesquioxide, zinc oxide and copper oxide are used as raw materials, and a solid-phase reaction method is adopted to prepare the negative temperature coefficient medium-entropy thermistor material with a chemical formula of (NiX1CoX2ZnX3CuX4) Mn2O4. Wherein the values of X1, X2, X3 and X4 are 0.075-0.425, and X1 + X2 + X3 + X4 = 1. The negative temperature coefficient medium-entropy thermistor material is of a single spinel structure. The material has the hysteresis diffusion effect of medium-entropy ceramic, and by combining the coordinated optimization effect of multiple components, the material constant and the resistivity of the thermal sensitive ceramic can be remarkably reduced, and the anti-aging performance can be improved.

The invention belongs to the technical field of preparation of boron carbide ceramics, and particularly relates to a preparation method of high-purity porous boron carbide ceramics based on high-frequency induction heating, under the condition that a sintering aid is not added, a plunger is forced to move downwards due to volume expansion caused by CO2 generated by a melt, so that boron carbide powder is pressurized, the effect of hot pressing sintering can be achieved, and the effect of high-purity porous boron carbide ceramics can be achieved. The problems of low yield and high cost caused by the use of a hot-pressing sintering furnace can be avoided, the comprehensive performance of the prepared boron carbide ceramic can be improved, the process is easy to control, and the method is suitable for mass production of the boron carbide ceramic round rod for the high-temperature gas cooled reactor nuclear control rod; the prepared boron carbide ceramic has the advantages of pure phase, high porosity, uniform pore structure and stable mechanical property, especially has very good pore connectivity, and can ensure timely discharge of helium and improve the safety of the nuclear control rod when being used as a high-temperature gas cooled reactor nuclear control rod.

The invention relates to a preparation method of high-strength and high-toughness composite silicon carbide ceramic, which comprises the following steps: mixing 70-82 parts of micron-sized alpha-silicon carbide powder, 5-15 parts of a mixed reinforced phase, 5-10 parts of a sintering aid, 1.9-2.1 parts of a dispersant and 0.9-1.1 parts of a binder to obtain a powder raw material, adding deionized water into the powder raw material, and carrying out ball milling to obtain water-based slurry; carrying out spray granulation on the water-based slurry to prepare spherical granulation powder; and adding the spherical granulation powder into a graphite mold, putting the graphite mold into a hot-pressing sintering furnace, heating to a sintering temperature, and carrying out hot-pressing sintering to obtain the high-strength and high-toughness composite silicon carbide ceramic. By adopting the method disclosed by the invention, the high-performance silicon carbide ceramic material with higher mechanical property and higher toughness can be obtained.

The invention relates to the technical field of high-performance structural ceramic materials and corrosion resistance optimization thereof, in particular to a preparation method of high-performance silicon nitride ceramic, which realizes performance improvement through dynamic optimization of a composite sintering aid, closed-loop regulation and control of air pressure sintering and multi-process data linkage. In the raw material pretreatment stage, a laser particle size analyzer is adopted for monitoring particle size distribution in real time, surface modification parameters are adjusted in a linkage mode, and a uniform monomolecular coating layer is formed; the proportion of rare earth oxide and aluminum oxide in the composite sintering aid is dynamically adjusted according to the fluctuation of the mixing torque, and agglomeration and segregation of the aid are inhibited. And in the air pressure sintering stage, the argon pressure and the heating rate are dynamically adjusted based on the slope of a shrinkage curve, and directional arrangement of beta-phase grains is promoted by combining low-temperature nitrogen protection and high-temperature argon densification. And multi-dimensional process control synergistically optimizes grain boundary components, structure and density, so that the corrosion resistance and the service life of the silicon nitride ceramic in a sulfur-containing environment are remarkably improved and the service life of the silicon nitride ceramic in the sulfur-containing environment is remarkably prolonged.

The utility model discloses a high-efficiency energy-saving ceramic handicraft firing kiln, which comprises a kiln body and has the beneficial effects that a kiln car and a firing frame are arranged, so that the kiln car can be pulled out of the kiln body, the kiln car is supported in an auxiliary manner through a guide roller at the top of a guide support plate, and the kiln car and the firing frame are pulled out, so that the kiln car can be conveniently fired. Ceramic needing to be fired can be conveniently placed on the firing frame, the position of the kiln car in the kiln body is jacked and fixed through the inner jacking block on the inner side of the kiln door, the kiln car and the firing frame are stably placed in the kiln body, the stability of the position during ceramic firing is improved, and through the arrangement of the heat preservation box and the heat exchange copper gas pipe, high-temperature smoke in the heat preservation box is achieved; gas treated by the oxygen enrichment device in the heat exchange copper gas pipe is heated, the temperature of combustion-supporting gas is increased, the combustion-supporting gas is mixed with gas supplied by the gas pipe in the concentration gas box, the mixture is sprayed out through the ventilation box and the combustion nozzle, ignition is conducted through the ignition rod, and ceramic firing is conducted through fuel.

The invention discloses a high-temperature-resistant ceramic formula and a preparation process thereof, the high-temperature-resistant ceramic formula comprises the following raw materials: a ceramic blank, glaze, a composite heat-conducting material and reinforced fibers, and the composite heat-conducting material and the reinforced fibers are mixed in the ceramic blank and the glaze; the specific formula comprises the following raw materials: a composite heat-conducting material, reinforced fibers and a ceramic body in a mass ratio of (2-3): (6-8): 100, and a mass ratio of the composite heat-conducting material to the reinforced fibers to glaze is (3-4): (7-9): 100; the reinforced fibers are added into the ceramic blank and the glaze to achieve the effects of increasing the ceramic strength and reducing cracks, meanwhile, the composite heat conduction material is added to form a net structure with the reinforced fibers, the heat conduction performance of the ceramic material is greatly improved through the heat conduction performance of the graphite powder, loads are effectively dispersed, and crack propagation is prevented; the material sintering can be promoted, so that the ceramic has better wear resistance and high temperature resistance.

The invention relates to the technical field of ceramic material connection, and particularly provides a silicon carbide ceramic connecting agent, a connecting method thereof and a silicon carbide ceramic connecting joint. The silicon carbide ceramic coupling agent comprises the following components in percentage by mass: 30%-80% of an organic silicon polymer precursor, 10%-60% of an inert filler and 1%-50% of an active filler. The organic silicon polymer precursor comprises vinyl hydrogen-based polycarbosilane, a cross-linking agent and an initiator, and in the organic silicon polymer precursor, the addition amount of the cross-linking agent is 0.1%-50% and the addition amount of the initiator is 0.1%-10% in terms of the mass of the vinyl hydrogen-based polycarbosilane being 100%. The invention aims to improve the compactness and the connection strength of the silicon carbide ceramic during connection.

A ceramic ball material according to an embodiment includes a spherical portion; and a band-shaped portion formed over a circumference of a surface of the spherical portion. The ceramic ball material has a ratio R1 / R2 of 0.3 or more and less than 1.0, where R1 denotes a surface roughness of an end portion of the band-shaped portion; and R2 denotes a surface roughness of a center portion of the band-shaped portion.

A method including pretreating ground lithium-containing ceramics to form alkali coated ceramics, leaching the alkali coated ceramics to form a leachate comprising a filtrate and a solid residue, preferentially extracting lithium from the filtrate to form a lithium rich solution and a raffinate, precipitating a crude lithium carbonate from the lithium rich solution and purifying the crude lithium carbonate to produce a battery grade lithium carbonate. A method including leaching a slurry comprising lithium-containing ceramics, water, a strong base, and an alkaline earth metal oxide / hydroxide at a pressure ranging from 0 to 1450 psi and at a temperature ranging from 100 to 500°C to form a leached slurry comprising a liquid filtrate and a solid residue, processing the liquid filtrate to recover a lithium-rich organic solution, and processing the lithium-rich organic solution to produce a battery-grade lithium compound and sodium sulfate.

A seed substrate for epitaxial growth has a support substrate, a planarizing layer of 0.5 to 3 μm provided on the top surface of the support substrate, and a seed crystal layer provided on the top surface of the planarizing layer. The support substrate includes a core of group III nitride polycrystalline ceramics and a 0.05 to 1.5 μm encapsulating layer that encapsulates the core having surface voids filled and flattened by Al or Si oxide, nitride, oxynitride, or a mixture thereof. The seed crystal layer is provided by thin-film transfer of 0.1 to 1.5 μm of the surface layer of Si <111> single crystal with oxidation-induced stacking faults (OSF) of less than 10 defects / cm2.

The invention discloses a silicon nitride ceramic based on a Yb2O3-MgSiN2 composite sintering aid and a preparation method of the silicon nitride ceramic, the silicon nitride ceramic comprises 93wt% of a Si3N4 matrix, 1-7wt% of Yb2O3 and the balance of MgSiN2, and the total mass of the Yb2O3 and the MgSiN2 as the composite sintering aid is 7wt%. The preparation method comprises the following steps: mixing the raw materials with absolute ethyl alcohol, then adding grinding balls, pouring the mixture into a polyethylene ball milling tank for ball milling, carrying out forced air drying treatment and grinding and sieving treatment on obtained slurry, and then putting sieved powder into a mold for SPS sintering. The problems that traditional silicon nitride ceramic is too high in sintering temperature, insufficient in grain boundary stability and the like are solved, and performance balance of low-temperature sintering, low oxygen content and high grain boundary stability of the silicon nitride ceramic is achieved under the industrial-grade production condition through the synergistic effect of material component innovation and process optimization; and a key material solution is provided for preparing the silicon nitride ceramic with good performance.

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

The invention, which relates to the technical field of structured light measurement, discloses a dual-frequency grating fringe projection system comprising a light source modulation group, a grating modulation group, a beam splitter prism and a projection lens. The light source modulation group comprises a first LED light source, a second LED light source, a first collimating lens group and a second collimating lens group; the grating modulation group comprises a first grating sheet, a second grating sheet, a first piezoelectric ceramic and a second piezoelectric ceramic; the first piezoelectric ceramic in the grating modulation group is connected with the first grating sheet, and the second piezoelectric ceramic is connected with the second grating sheet, so that the positions of the grating sheets are moved, and the stripe patterns at the bottoms of the grating sheets are translated. The system adopts the two piezoelectric ceramics to drive the grating sheets and the beam splitter prisms with different widths for beam combination, the structure is simple, and a low-cost double-frequency four-step phase shift pattern can be realized. The fine grating stripes can improve the measurement precision of three-dimensional reconstruction, and the wide grating stripes can improve the measurement depth of field of three-dimensional reconstruction, thereby improving the application scene of the structured light 3D system.

The invention belongs to the technical field of aluminum plate machining, and particularly relates to an aluminum plate longitudinal cutting device which comprises a supporting table, and a discharging roller and a collecting roller are arranged at the top of the supporting table. By arranging the induction coil, the first permanent magnet, the second permanent magnet and the electromagnetic heating plate, the aluminum plate which is not longitudinally cut is heated, the hardness and brittleness of the aluminum plate can be reduced, longitudinal cutting is smoother, the quality of finished products is improved, deformation of the aluminum plate is reduced during longitudinal cutting, and the cutting precision and stability are ensured; by arranging a fixing plate, a shaking plate, piezoelectric ceramic pieces, springs and the like, the two piezoelectric ceramic pieces are placed in a cutting gap of an aluminum plate, when a longitudinal cutter is abraded, the cutting gap can be enlarged, the shaking amplitude of the piezoelectric ceramic pieces in the cutting gap is increased under pushing of the first spring, output current is increased, and the cutting effect of the aluminum plate is improved. And the state of the longitudinal cutter can be conveniently monitored in real time for subsequent detection operation.

Provided are a coating composition, a separator, an electrochemical device, and an electronic device, the coating composition including a fiber material, filler particles, and a binder, the fiber material including at least one of a first inorganic ceramic or a first organic matter containing a miscellaneous element, the fiber material comprises at least one of a first inorganic ceramic and a second organic matter containing a hetero-element, the filler particles comprise at least one of a second inorganic ceramic and a second organic matter containing a hetero-element, at least one of the fiber material and the filler particles is an organic matter containing a hetero-element, the hetero-element comprises a nitrogen element or / and a phosphorus element, and the mass percentage of the hetero-element is 10%-60% based on the mass of the coating composition. When the coating composition is applied to the diaphragm, the diaphragm is coated with the coating composition to form a coating, so that the thermal safety and high-temperature cycle performance of the electrochemical device are improved.

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

The invention provides a binder for a ceramic coating diaphragm, a preparation method of the binder, the ceramic coating diaphragm and a battery in order to solve the problems that a water-based binder used by an existing ceramic coating diaphragm is poor in thermal stability and the diaphragm is curled in a low-humidity environment. The binder comprises latex particles, the latex particles comprise a core-layer polymer and a shell-layer polymer, the shell-layer polymer is arranged on the outer surface of the core-layer polymer, the raw material of the core-layer polymer comprises a first polymeric monomer, and the raw material of the shell-layer polymer comprises a second polymeric monomer and a third polymeric monomer, the second polymeric monomer includes a polymerizable monomer containing an oxazoline group. The adhesive provided by the invention is mixed with a ceramic material to prepare ceramic slurry, the ceramic slurry is coated on the surface of a base membrane to obtain a ceramic coated diaphragm, the ceramic diaphragm can resist thermal shrinkage of 150 DEG C, the transverse thermal shrinkage and the longitudinal thermal shrinkage of the ceramic diaphragm are controlled within 3%, and the diaphragm is high in peel strength, low in humidity and free of curling.

The invention belongs to the technical field of ceramic materials, and discloses a high-entropy boride composite silicon carbide ceramic with a controllable microstructure and a preparation method and application thereof. The method comprises the following steps: carrying out ball milling, drying and sieving on Zr, Ta, Nb, W, Cr, B4C and SiB6 to obtain mixed powder; the preparation method comprises the following steps: putting a boron carbide powder into a graphite mold of which the inner surface is coated with a BN layer, heating to 1850-2050 DEG C, carrying out SPS sintering, and preparing the high-entropy boride composite silicon carbide ceramic with controllable microstructure under 20-35 MPa and a vacuum degree of 10 Pa, and the molecular formula of the high-entropy boride composite silicon carbide ceramic is (Zr0. 2Ta0. 2Nb0. 2W0. 2Cr0. 2) B2-SiC. The ceramic has good mechanical properties, the hardness at room temperature is 27-32 GPa, the fracture toughness is 4.5-6 MPa.m < 1 / 2 >, the bending strength is 450-600 MPa, and the ceramic can be applied to extreme environments or the field of radiation protection.

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

A radio frequency (RF) feedthrough component having an impedance greater than 20 ohms is disclosed. The feedthrough includes a ceramic body having a flexible non-ferrous conductor adhered to its outer peripheral surface and to an inner peripheral surface of an aperture through the ceramic body. A non-ferrous conductive lead is disposed through the aperture and protrudes from at least one side thereof. A non-ferrous hermetic seal is formed between a portion of the non-ferrous conductive lead disposed in the aperture and the non-ferrous conductor adhered to the surface of the aperture. The RF feedthrough can be assembled in an opening of a conductive housing to form an electromagnetically shielded package for an electrical circuit.

The invention relates to the technical field of glass, in particular to microcrystalline glass and a preparation method thereof, reinforced microcrystalline glass and a preparation method thereof, and a glass product. The invention provides microcrystalline glass which comprises the following components in percentage by mass based on the total mass of 100%: 58.21-70.63% of SiO2; the content of Al2O3 is 6.46 to 7.83 percent; zrO2: 3.23% to 3.92%; 1.86%-2.3% of P2O5 (P2O5); 0.4 to 0.5 percent of B2O3; 1.9 to 14.4% of a rare earth metal oxide; an alkali metal oxide: 10.86 to 12.99%; wherein the rare earth metal oxide is prepared from Y2O3 and La2O3; the alkali metal oxide comprises Na2O and Li2O. According to the microcrystalline glass disclosed by the invention, the link of a glass network is enhanced by utilizing the rare earth metal oxide and Al2O3 together to form a high-density network structure, uniform nucleation is induced through the nucleating agent, fine grains are generated, grain boundary defects are reduced according to a multi-step nucleation-crystallization system, and the mechanical property is remarkably improved.

The invention relates to an ionically conductive membrane (10) for an electrochemical device, the membrane comprising a layer of a material comprising a polymer binder and a powdered ceramic, characterized in that the ceramic is doped with Yttrium oxide. Figure 1.

The utility model discloses a high-precision valveless plunger pump capable of freely adjusting flow, which is characterized in that the volume of the whole pump is reduced through an adapter, the movement accuracy of a piston rod of a pump body is ensured, the flow precision of the pump body is greatly improved, the angle of a piston cylinder body is adjusted to adjust the flow, and the flow requirements of various places are met. A motor body of the motor is fixed to one side plate of the supporting plate, the adjusting plate is arranged on the other side plate of the supporting plate, a plunger pump cylinder body is fixedly arranged on the upper side of the adjusting plate, an adjusting long hole is formed in the connecting position of the supporting plate and the adjusting plate, and the adjusting plate and the supporting plate are fixed through an adjusting bolt penetrating through the adjusting long hole. Two ends of the steering gear are respectively connected with a power output shaft of the motor and a plunger pump piston rod, and the plunger pump cylinder body and the plunger pump piston rod are made of ceramics; the plunger pump can be widely applied to the field of plunger pumps.

A heat dissipation member includes an intermediate member, a first member and a second member, each with a plate shape and made of a ceramic. The intermediate member includes a plurality of through holes each penetrating through a first surface and a second surface, of the intermediate member, located opposite to each other. The first member includes a first groove portion on a third surface of the first member, facing the first surface of the intermediate member. The second member includes a plurality of second grooves on a fourth surface facing the second surface of the intermediate member, and a heat source is arranged on a fifth surface located opposite to the fourth surface.

The invention discloses a high-entropy relaxation type lead-free perovskite ceramic and a preparation method thereof. The high-entropy relaxation type lead-free perovskite ceramic is a solid solution of Na < 0.2 > Bi < 0.2 > Ba < 0.2 > Sr < 0.2 > Ca < 0.2 >) TiO3 and (K < 0.5 > Na < 0.5 >) NbO3; the content of the (K0. 5Na0. 5) NbO3 accounts for 5 to 15 mol percent of the high-entropy relaxation type lead-free perovskite ceramic. By introducing (K0. 5Na0. 5) NbO3, energy band regulation and relaxation behavior adjustment are effectively realized, the breakdown electric field intensity is remarkably improved, the energy storage performance is improved, good stability is kept under the conditions of temperature, frequency and a circulating electric field, and the actual requirements of a pulse power capacitor on a high-performance and long-life energy storage dielectric material are met.