32 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.

The invention relates to the technical field of preparation of continuous oxide fiber strengthened and toughened oxide-based composite materials, and particularly discloses a preparation method of a chopped / continuous alumina fiber synergistically strengthened and toughened alumina-based composite material, which comprises the following steps: preparing chopped Al2O3 fibers; the Al2O3 fiber cloth and the chopped Al2O3 fibers are subjected to degumming treatment; the preparation method comprises the following steps: preparing Al2O3 slurry with low solid phase content and Al2O3 slurry containing chopped Al2O3 fibers; the preparation method comprises the following steps: dipping Al2O3 fiber cloth in Al2O3 slurry containing chopped Al2O3 fibers, and carrying out compression molding, drying and high-temperature sintering to obtain an Al2O3 (s, c) / Al2O3 composite material rough blank; and the Al2O3 (s, c) / Al2O3 composite material rough blank is subjected to low-solid-content Al2O3 slurry densification treatment and Al2O3 sol densification treatment, and the composite material is obtained. The chopped alumina fibers are introduced to toughen the alumina fiber reinforced alumina-based composite material, so that the composite material not only has excellent mechanical properties in the fiber direction, but also has excellent delamination resistance in the thickness direction.

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.

This invention discloses an alumina support and its preparation method. The alumina support includes an alumina matrix and first sheet-like alumina particles grown in situ on the outer surface of the matrix. The alumina matrix includes granular alumina particles and second sheet-like alumina particles. The size of the first sheet-like alumina particles is 100~600nm, and the sheet-like particles on the surface are stacked to form pores of 40-300nm. The preparation method is as follows: (1) Mix γ-phase alumina powder with propylene oxide aqueous solution and perform hydrothermal treatment to obtain sheet-like boehmite HP1; (2) Mix the sheet-like boehmite HP1 and boehmite P2 from step (1) to form an alumina support precursor; (3) Place the alumina support precursor in propylene oxide solution for a second hydrothermal treatment, and the treated material is used to obtain the alumina support. This alumina support has a rich macroporous content and can be used in macromolecular catalytic reactions, especially suitable for the hydrotreating process of heavy residue oil.

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.

A method for preparing an alumina-based eutectic ceramic coating via laser cladding uses rare earth oxide, zirconium oxide and alumina as raw materials, and prepares an alumina-based eutectic ceramic powder by a sintering reaction method or a solvent-precipitation method, the alumina-based eutectic ceramic powder is mixed with a binder, a dispersant and a defoamer to prepare a slurry, and then spheroidized and granulated to prepare an eutectic ceramic spherical feed, the colloid is removed from the spherical feed, and then laser cladding is performed on a sandblasted alumina substrate by synchronous powder feeding to prepare the alumina-based eutectic ceramic coating with few grain boundaries and strong CMAS corrosion resistance. The coating prepared by the invention has the advantages of high temperature resistance, good oxidation resistance, and excellent corrosion resistance.

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

The invention relates to the technical field of industrial waste gas treatment, and discloses a heat accumulating type thermal incinerator waste gas treatment material resistant to silicon blockage and a preparation method thereof.The material is prepared from kaolin, talc, a calcined alumina matrix, a pre-synthesized magnesium-stabilized aluminum titanate clinker, monoclinic zirconium oxide and a lithium feldspar modifier; the preparation method comprises the following steps: preparing the raw materials into a dry powder mixture, adding water, carrying out ball milling and filter pressing to obtain a mud cake, adding an organic auxiliary agent, and carrying out vacuum pugging to obtain a plastic mud section; performing extrusion molding to obtain a honeycomb green body with the pore density of 10-13 cpsi and the wall thickness of 1.4-1.6 mm; sintering at the temperature of 1390-1410 DEG C, and then quenching at the speed of 5-8 DEG C / min in the interval of 1100-700 DEG C. Silicon corrosion is blocked through chemical inertness of monoclinic zirconium oxide, surface compactness is promoted through lithium feldspar, thermal expansion mismatch of binding clinker and a base body and microcrack toughening are induced through a quenching technology, and the problems of pore channel blockage and thermal shock cracking of the heat accumulator under the working condition of silicon-containing waste gas are solved.

The invention relates to an alumina fiber reinforced alumina-based composite material and an ultrasonic-assisted impregnation preparation method thereof. The preparation method comprises the following steps: pretreating alumina fiber cloth, and preparing alumina ceramic slurry; the pretreated alumina fiber cloth is arranged in the alumina ceramic slurry, and dipping is carried out under the ultrasonic effect; laminating, laying, hot-pressing and drying to obtain a green body; curing and sintering the green body to form a rough blank; and carrying out dipping treatment on the rough blank by adopting alumina sol, drying after dipping, sintering after drying, and repeating the dipping, drying and sintering processes to obtain the alumina fiber reinforced alumina-based composite material. According to the invention, through a composite process of combining ultrasonic-assisted impregnation with alumina sol cyclic impregnation, the filling and impregnation effect of the slurry on fibers is remarkably improved, so that the slurry uniformly permeates into fiber bundles and fabric gaps, the internal pore defects of the material are reduced, and the density and mechanical properties of the composite material are greatly improved.

The invention relates to a glucose cracked carbon modified Al2O3-based microwave absorbing ceramic and a preparation method thereof, and belongs to the technical field of microwave absorbing materials. The catalyst is prepared from the following raw materials in percentage by mass: wt.% of glucose, wt.% of Al2O3, wt.% of TiO2, and the balance of water. Al2O3 is used as a low-dielectric-constant matrix to provide structural support, TiO2 is used as a sintering aid to promote ceramic densification, and amorphous carbon generated by high-temperature cracking of glucose is used as a dielectric loss type wave-absorbing agent. According to the prepared glucose cracked carbon modified Al2O3-based microwave absorbing ceramic, amorphous carbon generated by cracking glucose at a high temperature is uniformly dispersed in an aluminum oxide matrix, so that the microwave absorbing performance of the material is successfully and remarkably improved, and the composite material inherits excellent mechanical strength and thermal stability of aluminum oxide; and due to the unique structural characteristics of the glucose cracked carbon, the dielectric loss capability and impedance matching performance of the material are effectively enhanced. The composite material adopts simple mixing, forming and sintering processes, and is easy for large-scale production.

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.

The invention discloses an alumina fiber high-temperature-resistant composite material and a preparation method thereof, and the alumina fiber high-temperature-resistant composite material comprises the following components by mass: 45-60 parts of alumina fiber; 20-35 parts of a modified alumina matrix; 3 to 8 parts of yttrium-doped lanthanum cerate; 2 to 6 parts of titanium boride-silicon carbide composite powder; 1 to 4 parts of lanthanum aluminate-mullite composite ceramic; 0.5-2 parts of a neodymium phosphate interface regulator; 0.3-1 part of a dispersant; 0.2 to 0.8 part of a sintering aid; by adding the four innovative components, the high temperature resistance, the mechanical property and the oxidation resistance of the material are synergistically improved, the prepared composite material can serve for a long time in the high-temperature environment of 1600-1800 DEG C, the breaking strength is larger than or equal to 350 MPa, the breaking tenacity is larger than or equal to 8.5 MPa * m (1 / 2), the oxidation resistance is excellent, and after heat preservation is conducted for 10 hours in the air atmosphere of 1800 DEG C, the service life is long. And compared with the prior art, the performance is obviously improved.

The invention discloses a preparation method of a macroporous magnesium-aluminum composite material, and belongs to the technical field of chemical engineering, and the method comprises the following steps: preparation of magnesium-aluminum sol, preparation of a first solution, preparation of a magnesium-aluminum dry gel film, preparation of a macroporous magnesium-aluminum composite material precursor and preparation of the macroporous magnesium-aluminum composite material. According to the invention, the alumina matrix is subjected to magnesium-aluminum coating modification, the pore structure of the magnesium-aluminum composite material is optimized, the surface acid-base property of the adsorbent material is improved by combining the modification of the organic ligand, and the adsorption selectivity of water vapor is greatly reduced while the structural stability of the material is ensured; the carbon dioxide can be efficiently captured in a high-water-vapor environment (such as air). The invention also discloses the macroporous magnesium-aluminum composite material prepared by the preparation method. Meanwhile, the invention further discloses application of the macroporous magnesium-aluminum composite material in the field of adsorption.

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 an alumina carrier and a preparation method thereof. The alumina carrier comprises an alumina matrix and flaky alumina grown in situ on the surface of the matrix, wherein the alumina matrix comprises worm-like alumina particles. The specific surface area of the alumina carrier is 210-320 m 2 / g, the pore volume is 0.75-1.0 mL / g, and the 8-15 nm pores account for 60%-75% of the total pore volume. The preparation method is as follows: (1) the gamma phase alumina powder is immersed into an aqueous propylene oxide solution for the first sealed heat treatment, and after the treatment, the solid-liquid separation is performed on the material, and the dried solid material is obtained as the worm-like powder; (2) the powder is mixed, shaped, dried and calcined to obtain the alumina carrier precursor; and (3) the alumina carrier precursor is immersed into the aqueous propylene oxide solution for the second sealed heat treatment to obtain the alumina carrier. The alumina carrier is suitable for the field of heavy residual oil hydroprocessing, and is especially suitable for the process of heavy residual oil hydrodemetallization and hydrodesulfurization with high metal impurity content.

The invention relates to the technical field of mullite sagger production, in particular to a mullite sagger and a preparation method thereof.The preparation method of the mullite sagger comprises the steps that S1, a porous aluminum oxide matrix and zirconium oxychloride suspension liquid are prepared; s2, immersing the porous aluminum oxide matrix into the zirconium oxychloride suspension liquid, and enabling the zirconium oxychloride suspension liquid to permeate into the surface of the porous aluminum oxide matrix; and S3, heating the porous alumina matrix with the surface attached with the zirconium oxychloride suspension to prepare the mullite sagger. The monoclinic phase zirconium oxide located in the surface of the porous aluminum oxide matrix plays a role in sealing pores in the surface of the porous aluminum oxide matrix, and the monoclinic phase zirconium oxide attached to the outside of the surface of the porous aluminum oxide matrix forms a compact monoclinic phase zirconium oxide layer to play a barrier role. Therefore, active alkali metal ions decomposed by the positive electrode material are effectively prevented from permeating into the surface of the mullite sagger, and the alkali erosion resistance of the surface layer is improved.

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.

Coating, comprehensive: a layer comprising an aluminum oxide matrix and at least one of zirconium oxide grains and hafnium oxide grains in the aluminum oxide matrix, wherein a mean grain size of the at least one of the zirconium oxide grains and the hafnium oxide grains is 100 nm or less, characterized in that the at least one of the zirconium oxide grains and the hafnium oxide grains is primarily arranged within grains of the aluminum oxide matrix.

This invention relates to the field of photocurable 3D printing materials, specifically to a high-solids, low-viscosity photocurable alumina-based ceramic slurry and its preparation method. By mass percentage, it comprises the following raw materials: 32-38% photocurable resin, 1.5-2.5% photoinitiator, 2.5-3.5% dispersant, and the balance being ceramic powder particles; wherein the ceramic powder particles include Al2O3 powder and SiC powder, with SiC powder accounting for 0.1-20% of the total mass of the ceramic powder particles, and the ceramic powder particles are graded according to large, medium, and small particle sizes. The ceramic slurry provided by this invention not only possesses good rheological properties and stability, but also improves the solids content, viscosity, and stability of the slurry, resulting in printed parts with high mechanical properties.

The present application relates to the industrial waste gas treatment technical field, disclose the heat accumulation type thermal incinerator waste gas treatment material and preparation method thereof of anti silicon blockage, the material is made of kaolin, talc, calcined alumina matrix and pre-synthesized magnesium stabilized aluminum titanate clinker, monoclinic zirconium oxide, lithium feldspar modifier, the preparation method includes: the raw material is made into dry powder mixture, water ball milling pressure filtration is used to prepare mud cake, the plastic mud section is prepared by adding organic additives vacuum mud preparation; Extrusion molding is honeycomb green body with 10-13 cpsi of hole density and 1.4-1.6mm of wall thickness; Sintering at 1390-1410 DEG C, then quenching at 1100 DEG C to 700 DEG C interval control 5-8 DEG C / min rate. The present application uses the chemical inertia of monoclinic zirconium oxide to block silicon corrosion, and lithium feldspar promotes surface densification, combined with clinker and matrix thermal expansion mismatch and quenching process induced microcrack toughening, solves the problem of channel blockage and thermal shock cracking of heat accumulator under the working condition of waste gas containing silicon.

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.

The invention discloses an erbium-stabilized zirconium oxide toughened aluminum oxide composite material and a preparation method thereof, and relates to the technical field of high-performance structural ceramics, the erbium-stabilized zirconium oxide toughened aluminum oxide composite material comprises an aluminum oxide matrix and a zirconium oxide toughening phase, the volume fraction of the zirconium oxide toughening phase is 10-30 vol%, the zirconium oxide toughening phase is an erbium-stabilized tetragonal phase, and the volume fraction of the erbium-stabilized tetragonal phase is 10-30 vol%. Wherein the molar percentage of erbium oxide is 1-5 mol%; according to the composite material, erbium ions are introduced to serve as a stabilizer of zirconium oxide, effective stability of tetragonal phase zirconium oxide is achieved, meanwhile, the material is endowed with excellent fluorescence performance and can be used for stress distribution in-situ monitoring, uniform doping of erbium elements is ensured by adopting a coprecipitation method in the preparation process, and high-energy ball milling and high-temperature sintering processes are combined, so that the composite material is prepared. The density and the grain boundary bonding strength are remarkably improved, so that the material has high strength, high fracture toughness and good optical response characteristics, and is suitable for performance tracking and failure analysis of precision ceramic parts in a complex service environment.

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.

The invention discloses aluminum oxide ceramic with high thermal shock resistance, a preparation method and application, and belongs to the technical field of ceramic. In order to solve the problem of poor thermal shock resistance of alumina ceramic, modified silicon carbide whiskers (through pickling pretreatment, an ammonium polyacrylate electrostatic dispersion layer and an aluminum dihydrogen phosphate-composite sol interface regulation and control layer) are prepared, and a staged sintering process (first-stage heat preservation at 800-1000 DEG C and second-stage heat preservation at 1500-1600 DEG C) is adopted, so that the thermal shock resistance of the alumina ceramic is improved, and the thermal shock resistance of the alumina ceramic is improved. And a multi-scale gradient interface layer of a silicon carbide whiskers-MgAl2O4 / rare earth aluminosilicate bonding layer-Al2O3-AlPO4 transition layer-aluminum oxide matrix is formed between the silicon carbide whiskers and the aluminum oxide matrix. The interface layer realizes smooth connection of thermal expansion coefficients, effectively relieves thermal stress and avoids generation of microcracks. The obtained ceramic is high in strength retention rate after being subjected to rapid cooling and rapid heating circulation at the room temperature of 1000 DEG C, the thermal shock resistance is remarkably improved, and the ceramic is suitable for the engineering fields of high-temperature heat exchanger components, aero-engine thermal barrier coating matrixes and the like.

The invention belongs to the field of new materials, particularly advanced ceramic materials, and particularly relates to a graphene quantum dot modified aluminum oxide composite ceramic based on surface chemical bonding and a preparation method of the graphene quantum dot modified aluminum oxide composite ceramic based on surface chemical bonding. According to the method, the high-performance GQD / Al2O3 composite ceramic with the quantum dots uniformly dispersed in the aluminum oxide matrix and with strong interface bonding is obtained, the chemical reaction is mild and controllable, extremely harsh conditions or expensive reagents are not used, high repeatability and stability are achieved, and a feasible technical route is provided for large-scale production of the high-performance GQD / Al2O3 composite ceramic.

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.