13 results about "Alumina matrix" patented technology

The present application relates to a kind of Y type molecular sieve catalytic material for improving gasoline yield and selectivity and its preparation method, Y type molecular sieve catalytic material is obtained by the hydrothermal crystallization of reactive microspheres containing zirconium, reactive microspheres containing zirconium contain 85-99.9 wt% alumina matrix and 0.1-15 wt% zirconium oxide, and the zirconium oxide contains tetragonal phase crystalline zirconium oxide.The Y type molecular sieve catalytic material of the present application has better strength and cracking effect, and the catalyst containing the Y type molecular sieve catalytic material of the present application can improve the selectivity and yield of catalytic cracking gasoline.

A ceramic material, a method of forming a ceramic material, and a ceramic substrate are disclosed, the ceramic material including surface-modified zirconia whiskers dispersed in an alumina matrix wherein the alumina matrix and the surface-modified zirconia whiskers are in a weight ratio of 97: 3 to 80: 20; wherein the surface of the surface-modified zirconium oxide whisker is provided with a strengthening phase microstructure, and the strengthening phase microstructure comprises strontium aluminate in a crystal phase.

The invention relates to a magnetic material comprising at least iron, in metallic form and / or in oxide form, and at least an alumina oxide matrix, the iron content being between 15% and 70% by weight as element iron relative to the total weight of said material, characterized in that said material has a specific surface area greater than 50 m² / g and less than 300 m² / g, said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, and at least one alumina oxide matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, characterized in that said material has a specific surface area greater than 50 m² / g and less than 300 m² / g, and said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The present technology provides a fluid catalytic cracking (FCC) catalyst composition that includes a Y-zeolite that includes a rare earth element or oxide thereof and an alumina matrix, wherein the alumina matrix includes y-AhCb or pseudo-boehmite and a dopant; and the dopant is selected from a Group IIIB metal, Group IVB metal, Group IV A element, Group VA element, an oxide thereof, or a combination of two or more thereof.

The application relates to the technical field of continuous ceramic fiber toughened ceramic matrix composite material preparation, and particularly discloses a continuous mullite fiber toughened mullite-alumina matrix composite material (Mu / Mu-Al2O3 composite material) with high mechanical properties and high thermal stability and a preparation method thereof, which comprises the following steps: dispersing mullite powder and alumina powder in different proportions into deionized water to prepare mullite-alumina slurry; preparing a rough blank: immersing the mullite-alumina slurry into mullite fiber cloth after removing glue, then performing mold drying and forming, and high-temperature sintering to obtain a Mu / Mu-Al2O3 composite material rough blank; and then performing later densification on the Mu / Mu-Al2O3 composite material rough blank by using the mullite-alumina slurry to obtain the Mu / Mu-Al2O3 composite material. By introducing high-purity, small-particle-diameter and high-surface-area high-activity mullite powder, the sintering temperature of the mullite-based composite material is reduced, the mechanical properties of the mullite-based composite material are improved, and the high-temperature stability of the composite material is improved.

This application belongs to the field of ceramic materials technology and provides a ceramic matrix composite material and its preparation method. The preparation method of the ceramic matrix composite material includes: (1) wet ball milling the raw materials to obtain a slurry; wherein, by mass percentage, the raw materials consist of 50%~80% alumina, 5%~40% silicon carbide whiskers, 5%~30% aluminum compounds and 0.1%~5% sintering aids; and the aluminum compounds are selected from at least one of aluminum hydroxide, aluminum sulfate and aluminum nitrate; (2) spray granulation of the slurry to obtain a powder to be pressed; (3) sintering the powder to be pressed to obtain the ceramic matrix composite material. This method can effectively improve the dispersion uniformity of silicon carbide whiskers in the alumina matrix and improve the density of the composite material.

The present application relates to the field of ceramics, and particularly to a high-temperature-resistant black colorant suitable for advanced ceramics, a preparation method and applications thereof, wherein the components of the high-temperature-resistant black colorant include, by mass ratio, 15-25% of Co3O4, 8-15% of Cr2O3, 2-5% of MnO2, 3-8% of SiO2, and 40-60% of Al2O3. The present application realizes the thermal expansion coefficient coordination of the colorant and the alumina matrix by introducing a combination of transition metal oxides matching the alumina lattice, thereby inhibiting cracking or peeling caused by interface stress. A composite doping strategy is adopted to make coloring ions (such as Co 2+ , Cr 3+ ) enter the interstitial space of the alumina lattice to form a stable solid solution structure, thereby significantly improving the color stability at high temperatures. Wet ball milling combined with surface modification is used to ensure uniform dispersion of the colorant particles in the alumina slurry and avoid color spot defects caused by agglomeration.

The application discloses a catalytic wet oxidation catalytic material and a preparation method thereof. The catalytic wet oxidation catalytic material takes acid modified montmorillonite loaded with copper oxide and optional nano ferrous sulfide as a matrix layer, and the outer surface of the matrix layer is wrapped with an active layer which is alumina loaded with nano ferrous sulfide; the matrix layer and the active layer are in a core-shell structure; the weight of the copper oxide accounts for 2-10% of the weight of the catalytic material, and the weight of the nano ferrous sulfide accounts for 5-20% of the weight of the catalytic material. The application further provides a preparation method of the catalytic wet oxidation catalytic material. The catalytic material has excellent catalytic degradation capacity for organic pollutants when used for treating organic wastewater.

The application relates to the technical field of anti-static alumina ceramic preparation, and relates to an anti-static alumina ceramic and a preparation method thereof.The preparation method comprises the following steps: obtaining an ultrafine alumina suspension, drying the ultrafine alumina suspension to obtain ultrafine alumina powder, extracting initial mass ratios from an initial mass ratio group in sequence to obtain an initial suspension, detecting the initial viscosity, the initial conductivity and the initial stability of the initial suspension, respectively collecting the initial viscosity, the initial conductivity and the initial stability to obtain an initial viscosity group, an initial conductivity group and an initial stability group, establishing a mathematical model, obtaining anti-static alumina based on an alumina matrix sample, a modified antimony-tin conductive agent sample and a dispersant sample, and preparing the anti-static alumina ceramic based on the anti-static alumina.The anti-static performance of the anti-static alumina can be improved.

This invention discloses a highly thermally shock resistant alumina ceramic, its preparation method, and its applications, belonging to the field of ceramic technology. Addressing the problem of poor thermal shock resistance in alumina ceramics, this invention prepares modified silicon carbide whiskers (pretreated with acid washing, followed by an ammonium polyacrylate electrostatic dispersion layer and an aluminum dihydrogen phosphate-composite sol interface control layer), and employs a staged sintering process (first stage holding at 800-1000℃, second stage holding at 1500-1600℃). This forms a multi-scale gradient interface layer between the silicon carbide whiskers and the alumina matrix, consisting of a silicon carbide whisker-MgAl2O4 / rare earth aluminum silicate bonding layer-Al2O3-AlPO4 transition layer-alumina matrix. This interface layer achieves a smooth transition in thermal expansion coefficients, effectively alleviating thermal stress and preventing microcrack initiation. The resulting ceramic exhibits high strength retention after rapid cooling and heating cycles from 1000℃ to room temperature, significantly improving its thermal shock resistance, making it suitable for engineering fields such as high-temperature heat exchanger components and thermal barrier coating substrates for aero-engines.

This invention discloses a porous alumina fiber with high specific surface area and its preparation method, relating to the field of alumina fiber technology. The porous alumina fiber with high specific surface area is composed of an alumina matrix and silicon components doped therein; the molar ratio of the silicon component to the aluminum component is 0.01-0.1 (based on oxides). In this invention, the main crystalline phase of the fiber is highly active γ-Al₂O₃, with abundant Lewis acid and Brønsted acid dual acidic sites formed in situ on the surface. This not only possesses intrinsic catalytic capabilities for reactions such as cracking and isomerization, overcoming the functional limitations of traditional supports that only provide support, but also strongly anchors the active metal components, effectively inhibiting their high-temperature aggregation and loss, fundamentally solving the industry problem of easy deactivation of active components. Simultaneously, the product has no residual impurities that inhibit catalytic activity, avoiding impurities occupying surface active sites, maximizing the preservation of effective reaction sites, and ensuring catalytic reaction efficiency.

This invention relates to a composite calcium oxide slag based on furnace lining adsorption and its application, belonging to the field of protective slag technology. The composite calcium oxide slag of this invention comprises the following raw materials in parts by weight: CaO 48-52 parts, Al2O3 35-40 parts, MgO 5-8 parts, and metallic aluminum powder 1-3 parts. The raw materials are pre-melted and mixed to obtain the composite calcium oxide slag. Before pre-melting and mixing, alumina and metallic aluminum powder are ball-milled, and the aluminum powder is embedded in the alumina matrix in the form of nanocrystals, improving the stability of the composite calcium oxide slag. By utilizing the trace amounts of metallic aluminum pre-embedded in the slag, a rough structure is generated in situ on the surface of the magnesium-aluminum spinel furnace lining, thereby enhancing the mechanical anchoring and chemical adsorption of the dynamic reaction film, reducing the film formation temperature, and greatly increasing the film coverage.