144 results about "Composite ceramic" patented technology

The application discloses a high-hardness high-strength low-temperature sintering composite ceramic material and a preparation method thereof, and comprises the following raw materials in parts by weight: active silicon-aluminum composite material 35-45 parts, modified manganese-silicon slag 20-25 parts, alpha-alumina micro powder 10-15 parts, sodium feldspar 12-18 parts, wollastonite 8-12 parts, low-temperature composite flux 10-15 parts and water 80-100 parts. The high-hardness high-strength low-temperature sintering composite ceramic material takes the active silicon-aluminum composite material as the raw material, introduces multiple solid waste derived components such as the modified manganese-silicon slag and the low-temperature composite flux in the formula, the components complement each other and have a synergistic effect in the sintering process, so that the ceramic material has high hardness and high bending strength, and the unification of solid waste reduction, resource utilization and ceramic performance improvement is realized.

A composite ceramic substrate and method for producing the same. The composite ceramic substrate includes a ceramic substrate, a circuit board, and a composite adhered structure adhered to the ceramic substrate and the circuit board. The composite adhered structure includes a first active metal layer adhered to the ceramic substrate, a second active metal layer adhered to the circuit board, and a solder layer arranged between the first active metal layer and the second active metal layer. The first active metal layer includes titanium hydride. The second active metal layer includes tin, copper, and titanium hydride. The solder layer includes tin, copper, and titanium hydride.

The application relates to the technical field of ceramic materials, in particular to a boron carbide composite ceramic material and a preparation method and an etching component thereof. The preparation method comprises the following steps: forming granular materials containing boron carbide, titanium boride and silicon carbide, the granular materials have a spherical structure, the mass proportion of the boron carbide in the granular materials is 70%-90%, the mass proportion of the titanium boride is 5%-25%, and the mass proportion of the silicon carbide is 5%-25%; and the granular materials are sequentially subjected to pre-sintering and hot-press sintering to prepare the boron carbide composite ceramic material; wherein the temperature of the pre-sintering is 1200 DEG C-1500 DEG C. The application can promote the three-dimensional communication growth of sintering necks in the hot-press sintering process, effectively improve the material density, ensure the good uniformity of the material, and synergistically improve the etching resistance of the boron carbide ceramic material.

This invention relates to the field of heat exchange materials technology, and discloses a high-temperature, high-pressure nano-conductivity heat exchange material. The heat exchange material comprises a metal matrix, a linearly distributed metal-ceramic gradient transition layer, and a nano-composite ceramic surface layer. The surface layer consists of 90-95 parts of nano-alumina and zirconium oxide composite powder and 5-10 parts of cubic phase nano-titanium nitride powder. The former is fused and stacked to form a continuous ceramic matrix, while the latter is monodispersed and anchored within it, with adjacent particles in contact. The heat exchange material is prepared by gradient layer spraying with a linearly decreasing plasma current as the ceramic composition increases, followed by back-side cooling of the matrix. The surface layer is sprayed using a coaxial air knife in a reducing atmosphere combined with a low-enthalpy jet to inhibit oxidation and vacuum diffusion annealing. This invention synergistically regulates the above-mentioned structure and interface state to achieve a balance between high thermal conductivity, excellent corrosion resistance, and high bonding strength, which helps extend the service life of heat exchange components under high-temperature and high-pressure environments.

The application discloses an antioxidant composite ceramic aerogel and a preparation method thereof, and belongs to the technical field of composite ceramic aerogels.The main body of the antioxidant composite ceramic aerogel is a silicon nitride aerogel, the nanostructure of the silicon nitride aerogel is one of one-dimensional silicon nitride nanowires and two-dimensional silicon nitride nanobands or a combination of the two nanostructures, and a mullite coating and a copper-nickel metal coating are sequentially coated on the nanostructure of the silicon nitride aerogel from inside to outside.The application can solve the technical problem that the prior art cannot prepare silicon nitride ceramic aerogels which can stably serve in a high-temperature oxygen environment at low cost and in batches.

This invention relates to the field of medical ceramic materials technology, and more particularly to a method for preparing a zirconia-based medical composite ceramic material. The method includes: adjusting the target number of cycles in response to the slurry mixing state, or compensatingly adjusting the spray granulation process parameters based on slurry state parameters; determining whether the current batch of green bodies has a risk of closed pores based on the green body characteristics, and determining an adjustment feature point based on the actual shrinkage rate variation; stopping the sintering heating and adding a holding stage in response to the adjustment feature point, and determining the intermediate holding temperature and the holding stage duration; obtaining the sintered body phase to determine the tetragonal zirconia retention rate, and determining whether the sintering adjustment strategy matches the characteristics of the current batch of slurry based on the sintered body performance; and adjusting the intermediate holding temperature of subsequent sintering processes based on the tetragonal phase retention rate deviation in response to the sintered body performance. This invention improves the performance of ceramic implants by adjusting the sintering temperature curve based on the characteristics of zirconia-based powder.

This invention discloses a carbon fiber-silicon carbide / silicon nitride composite ceramic aerogel, its UV-assisted preparation method, and its applications, belonging to the fields of inorganic non-metallic porous material preparation, photocurable additive manufacturing, and seawater desalination technology. First, a photosensitive resin containing short-cut carbon fibers is prepared. The photosensitive resin is then poured layer by layer into a mold and cured layer by layer using UV light to form a preform. The preform is then freeze-dried to construct a fully interconnected porous framework. Finally, high-temperature heat treatment is performed in a nitrogen atmosphere, generating silicon carbide and silicon nitride reinforcing fibers in situ on the surface of the porous framework, thus obtaining the ceramic aerogel. The ceramic aerogel prepared by this invention possesses lightweight and porous structural characteristics, controllable shape, stable mechanical properties, salt corrosion resistance, and high photothermal conversion efficiency. It can be used as a photothermal interface evaporation material to efficiently achieve long-term stable desalination of high-concentration seawater, showing broad application prospects in the field of seawater desalination.

The application belongs to the technical field of refractory materials, and discloses a multi-scale pore carbon-based microsphere and a preparation method thereof. The application prepares a premix by grinding walnut shell powder, aluminum powder and an additive into fine powder, takes polystyrene balls as spherical supports, adds a silica sol solution, and forms a shape in a granulator and sieves. After drying, heat treatment and other steps, a multi-scale pore carbon-based microsphere is synthesized at low temperature. In the carbon skeleton hole formed by the walnut shell powder, a Sialon-SiC composite ceramic phase is generated in situ, filling part of the pores, so that pores of different scales are formed. The application uses cheap and easily available raw materials, has the characteristics of low cost and simple preparation process, and the prepared multi-scale pore carbon microsphere has excellent high-temperature resistance.

The application discloses a ceramic roller rod and a preparation method thereof, and relates to the technical field of ceramic matrix composites.The ceramic roller rod comprises a core layer, a transition layer and a surface layer;the layered gradient structure of the core layer, the transition layer and the surface layer is designed, alumina-zirconia, alumina-mullite and silicon nitride-titanium boride composite ceramic matrices are selected for each layer, and special matrix-reinforcing phase combinations are formed by matching nano silicon carbide particles, boron nitride particles and graphene microsheets;meanwhile, a pretreatment process of separately ball-milling and screening raw materials of each layer is adopted, thus solving the problems of the existing roller rod, such as single matrix matching conventional reinforcing phase, no functional doping ratio and easy agglomeration of overall mixed raw materials, so that the matrix and the reinforcing phase of each layer form material synergy, and the different functional requirements of the core bearing, the intermediate layer connection and the outer surface wear resistance and high temperature resistance are met respectively, and precise adaptation of material performance and functions of each part of the roller rod is realized.

本发明公开了兼具高硬度高韧性的α‑SiAlON / TiN复相陶瓷材料、制备方法及其应用，属于合金切削刀具技术领域。该制备方法采用放电等离子烧结工艺对制备好的原料粉末进行烧结，最终制得的α‑SiAlON / TiN复相陶瓷材料由TiN和α‑SiAlON两相组成，两相间界面结合良好，界面表现出阶梯状结构。本发明将TiN颗粒添加到α‑SiAlON陶瓷中，实现了较高强度的两相界面及显著延长的裂纹扩展路径，合成了性能优异的α‑SiAlON / TiN复相陶瓷材料，硬度大于20GPa，断裂韧性大于6.5 MPa·m1 / 2。

This invention belongs to the field of far-infrared radiation coating technology, specifically relating to a far-infrared radiation coating, coating method, and application. The raw materials for preparing the coating include modified organosilicon resin, high-structure conductive carbon black, far-infrared composite ceramic powder, flake graphite, dispersant, coupling agent, leveling agent, thixotropic agent, and solvent. The coating prepared by this method exhibits a normal total emissivity of 0.89 in the 2.5-25μm range, a peak radiation wavelength of 8.16μm, and a relative radiation intensity ≥0.95 in the 7.6-8.9μm band at a working temperature of 40-60℃ in a test environment of 20℃ and 48%RH. Furthermore, the coating has low cost, strong adhesion, and good flexibility, making it particularly suitable for the application requirements of flexible substrates such as low-temperature wearable products.

The application discloses a kind of ternary composite ceramic binder semiconductor wafer low-damage fine grinding wheel and its preparation method, and the grinding wheel is composed of metal matrix and abrasive layer, and the abrasive layer includes diamond, Al2O3-Si3N4-ZrO2 ternary composite ceramic binder, sintering aid and pore former;It is prepared by surface modification, ultrasonic-sol-gel dispersion, gradient pressing, programmed sintering and precision gear grinding.The binder of the application has high toughness, strong holding force, uniform abrasive dispersion, ordered porous structure, and the roughness of processed wafer is Ra≤3nm, the service life reaches the level of imported products, with low cost, short delivery time, suitable for high-precision thinning of third-generation semiconductor wafers.

The application relates to a porous SiCN nw composite wave-absorbing ceramic and a preparation method thereof, and belongs to the field of ceramic-based wave-absorbing materials. The porous SiCN nw composite wave-absorbing ceramic comprises a porous Si3N4 ceramic matrix, a carbon layer uniformly wrapped on the pore wall surface of the porous Si3N4 ceramic matrix, and SiCN nanowires uniformly grown in the pores of the porous Si3N4 ceramic matrix; wherein the total mass of the carbon layer and the SiCN nanowires is 1-10 wt% of the porous Si3N4 ceramic matrix. By introducing the carbon layer and the SiCN nanowires with different structures into the pore structure of the Si3N4 matrix ceramic, the two components of the wave-absorbing phase can synergistically exert the advantages of each component, optimize the impedance matching degree of the material, and broaden the absorption bandwidth of the material. Moreover, the process is simple, the proportion of the two wave-absorbing phases can be regulated by changing the heat treatment temperature, the impedance matching degree of the material is optimized, and the prepared porous SiCN nw composite ceramic has good wave-absorbing performance.

This invention relates to the field of ethylene glycol preparation, specifically to a method for the direct production of ethylene glycol from ethylene. The method includes: reacting ethylene with hydrogen peroxide in the presence of an oxidative hydration bifunctional catalyst to obtain a material containing ethylene glycol, and collecting the product after separation via a metal-ceramic composite membrane. Using this method, ethylene glycol can be produced in a one-step process. The reaction exhibits high hydrogen peroxide utilization, ethylene conversion rate, and ethylene glycol selectivity, along with high catalyst activity and stability. During separation, the transmembrane pressure difference is small, allowing the separation system to operate continuously for extended periods. The resulting product liquid has a low catalyst concentration.

This invention relates to the field of automotive reinforcement plate technology, specifically to a corrosion-resistant, high-rigidity right rear shock absorber mounting reinforcement plate and its preparation method. The plate comprises the following raw materials by weight: 100 parts matrix alloy powder, 8-12 parts additive A, 5-9 parts additive B, 3-5 parts graphite powder, 2-3 parts zinc stearate, 3-4 parts polyvinyl alcohol, 0.4-0.6 parts graphite carbon powder, and 0.8-1.5 parts electrolytic copper powder. In this invention, additive A is prepared as a composite additive through a zirconium precursor mixture and a magnesium precursor mixture, forming a uniformly dispersed zirconium-magnesium composite ceramic phase in the iron-based alloy matrix. This effectively refines the alloy grains, strengthens grain boundaries, and improves the stiffness and mechanical strength of the reinforcement plate. Additive B uses a potassium fluorotitanate and cerium nitrate composite treatment solution as its core, combined with polyaniline and sulfosalicylic acid for in-situ film formation, optimizing the sintering interface bonding force and effectively improving corrosion resistance life under salt spray conditions.

The application belongs to the field of silicon carbide ceramic membranes, and specifically provides a silicon carbide composite ceramic membrane with a gradient pore size structure, which comprises a support layer, a transition layer and a separation layer from inside to outside; the transition layer and the separation layer are formed by sintering after being treated by a coating solution; the preparation steps of the coating solution include the following: S01. taking germanium-containing optical fiber waste, grinding, then mixing with carbon powder and iron oxide powder, and continuing to ball mill to obtain mixed micro powder; S02. adding silicon carbide micro powder and mixed micro powder into a dispersion liquid, stirring, then adding a silane coupling agent, continuing to stir, and standing to remove bubbles, and the coating solution is obtained. The coating solution prepared by the application can reduce the sintering temperature of the silicon carbide composite ceramic membrane and reduce the process cost.

This invention discloses an MBNS-GC-Ni2Si reinforced biphase SiC composite ceramic and its preparation method. The method includes adding hexagonal boron nitride to phenolic resin and exfoliating it in a three-roll mill to obtain a first mixture containing multilayer boron nitride nanosheets; dissolving the first mixture in furfural solution, then sequentially adding high-purity silicon powder, nickel nitrate hexahydrate, boron carbide, and α-SiC ceramic powder, and stirring to obtain a second mixture; removing moisture and furfural from the second mixture and then vacuum sintering it at 1900-2100℃. The MBNS-GC-Ni2Si reinforced biphase SiC composite ceramic obtained by this invention achieves high mechanical strength and excellent electromagnetic wave absorption performance. It meets the requirements of high-performance structure-function integrated SiC-based composite ceramics, such as aerospace, stealth fighters, and functionalized armor, and has broad market application prospects.

This invention belongs to the field of composite ceramics technology, specifically relating to a shell-like composite ceramic with both high strength and toughness, its preparation method, and its applications. The composite ceramic obtained by this invention possesses a layered micro-heterogeneous structure resembling a shell, comprising a "brick" layer composed of sheet-like alumina and a first whisker, and a "mud" layer composed of nano-alumina particles, a second whisker, and nanosheets. The "brick" and "mud" layers are alternately stacked. Specifically, the material composition and structure are precisely controlled through multiple freeze-drying processes to establish the micro-heterogeneous structure, which is then combined with hot-pressing sintering to obtain the composite ceramic with the shell-like micro-heterogeneous structure. The composite ceramic prepared by this invention exhibits excellent flexural strength and fracture toughness, and has broad application prospects in the fields of machinery, electronics, and aerospace.

This invention discloses a high-temperature ceramic heat exchanger for a CSP (Cyclic Spatial Purifying Furnace) soaking tub, comprising a honeycomb heat exchanger body and a MoSi2-B4C-based self-healing coating on its surface. The honeycomb heat exchanger body is made of ZrO2-SiC-Al2O3 ternary composite ceramic material and has honeycomb channels with gradient pore sizes. The honeycomb heat exchanger body includes a high-temperature end on the high-temperature flue gas inlet side and a low-temperature end on the low-temperature flue gas outlet side, wherein the channel pore size of the high-temperature end is smaller than that of the low-temperature end. The honeycomb high-temperature ceramic heat exchanger of this invention can effectively improve the high-temperature strength, heat exchange efficiency, corrosion resistance, and operational stability of the heat exchanger, meeting the high-efficiency waste heat recovery requirements of CSP soaking tubs, and has significant economic and environmental benefits.

The application discloses a preparation method of fly ash-silane coupling agent composite ceramic membrane, which comprises the following steps: after pretreatment, fly ash is mixed with polyether sulfone, N-methyl pyrrolidone solvent and polyvinyl pyrrolidone to prepare uniform slurry; the slurry is transferred to a spinning kettle; green bodies are prepared after wet spinning and phase conversion; and fly ash ceramic membrane support bodies are prepared through high-temperature gradient sintering. Anhydrous ethanol and deionized water are mixed, hydrochloric acid is added dropwise to adjust the pH value to 4.5, then polyvinyl pyrrolidone is added, stirring is carried out, and then a silane coupling agent is added dropwise to prepare a silane coupling agent coating solution; the ceramic membrane support body is coated by using a pulling method, and is cured in an oven at 80 DEG C, so that the fly ash-silane coupling agent composite ceramic membrane is obtained. The fly ash-silane coupling agent composite ceramic membrane has high oil interception rate, high flux and high stability, and can significantly improve the filtering performance of the support body. Meanwhile, the fly ash-silane coupling agent composite ceramic membrane conforms to the concept of treating waste with waste, reduces the preparation cost, and is suitable for industrial application.

The invention belongs to the technical field of ceramics, and relates to an AlN composite ceramic with a high-temperature wetting phase as well as a preparation method and application of the AlN composite ceramic. The preparation method of the AlN composite ceramic comprises the following steps: carrying out ball-milling mixing on AlN, an additive and praseodymium oxide, then drying, sieving, and carrying out dry pressing and isostatic pressing to obtain an AlN green body; the AlN green body is subjected to debonding treatment, and an AlN prefabricated body is obtained; carrying out high-temperature reaction on the AlN preform in an inert atmosphere to obtain a high-temperature wetting phase; and further raising the temperature to sinter and densify to obtain the AlN composite ceramic. The AlN ceramic device is prepared from praseodymium oxide, so that a high-temperature wetting phase uniformly-distributed three-dimensional network structure can be formed in the ceramic, and the mechanical property of the AlN ceramic is improved while the sintering densification of the AlN ceramic is promoted.

This invention discloses a method for preparing a stretchable piezoelectric composite material. The method includes: (1) preparing a piezoelectric ceramic framework structure using a co-foaming-high-temperature sintering process; (2) coating the framework structure with a polymer composite dielectric layer to form a composite ceramic framework structure; and (3) filling the composite ceramic framework structure with silicone rubber to form a stretchable piezoelectric composite material. The piezoelectric composite material prepared by this invention has a high piezoelectric coefficient, with a positive piezoelectric coefficient reaching 110 pC N. ‑1 The above electrostrain can reach 200 pm V. ‑1 The above. It has extremely low acoustic impedance, less than 4Mrayl. It has 10pm. 2 N ‑1 It exhibits high hydrostatic pressure sensitivity. It also possesses excellent mechanical properties, with a tensile elongation at break exceeding 30%. Simultaneously, its piezoelectric performance remains essentially stable under uniaxial tensile strain up to 20%, showing no significant attenuation after multiple cycles. When used as a sound wave receiver, it can achieve a relative bandwidth exceeding 40% and high pulse output amplitude at -6dB without the need for an acoustic matching layer.

This invention belongs to the field of fluorine-free functional ceramic coating technology, and discloses a fluorine-free ceramic non-stick coating for aluminum-based cookware and its preparation method. The coating is composed of composite ceramic powder, a food-grade fluorine-free composite sintering aid composed of cerium oxide and lanthanum oxide pretreated with sodium citrate, food-grade nano-hydroxyapatite pretreated with a silane coupling agent, nano-alumina, a sinterable inorganic precursor, and deionized water in parts by weight. The preparation method includes substrate pretreatment, modified substance pretreatment, slurry preparation, coating, and low-temperature sintering steps. This invention achieves low-temperature sintering, avoids softening of the aluminum-based substrate, reduces energy consumption, and produces a coating with high density, excellent corrosion resistance and aging resistance, no harmful components are released, good non-stick properties, and is suitable for the industrial production requirements of aluminum-based cookware. Furthermore, it is fluorine-free, meeting food safety and environmental protection requirements.