48 results about "Alumina matrix" patented technology

The invention provides an MAX phase / alumina layered composite ceramic and an in-situ synthesis preparation method thereof, and the method comprises the following steps: respectively preparing an alumina matrix layer and an MAX phase interface layer through a tape casting method, then alternately laminating the alumina matrix layer and the MAX phase interface layer, and finally carrying out hot pressed sintering to obtain a layered composite ceramic product. According to the invention, the layered composite ceramic which takes aluminum oxide as a matrix and MAX-phase ceramic as an interlayer is prepared through an in-situ synthesis technology, so that the effects of great toughening, strength increase without reduction and high damage tolerance are realized, and the fracture mode is converted from brittle fracture of aluminum oxide ceramic to safe stepped fracture. The strength and toughness of the aluminum oxide ceramic are successfully balanced and synergistically improved, and the industrial problem that strength and toughness cannot be both considered in a traditional aluminum oxide ceramic toughening technology is solved.

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 field of high-performance anti-cracking and anti-seepage concrete, in particular to high-performance anti-cracking and anti-seepage concrete for hydraulic structures and a preparation method thereof. The high-performance anti-cracking and anti-seepage concrete for the hydraulic structure comprises the following substances in parts by weight: 25-30 parts of cement; 80 to 100 parts of coarse aggregate; 70 to 80 parts of fine aggregate; 10 to 15 parts of water; 3-5 parts of an anti-crack and anti-permeability modifier; the anti-crack and anti-permeability modifier comprises a silicon-aluminum base material, and the silicon-aluminum base material comprises fly ash, slag and metakaolin which are mixed according to the mass ratio of (4-5): (2.5-3.5): (2-3). The anti-cracking and anti-seepage performance is synergistically improved through the silicon-aluminum base material composite modifier. Compared with a single mineral admixture, the composite system can more efficiently refine the pore size distribution and reduce the permeability coefficient of the concrete; meanwhile, Ca (OH) 2 crystals are consumed through a volcanic ash reaction, interface stress concentration caused by crystal oriented growth is reduced, microcrack initiation is inhibited from the source, and crack resistance and permeability resistance are improved.

The invention discloses a solid-state battery diaphragm based on porous aluminum oxide directional filling polymer modification, which comprises a porous aluminum oxide matrix prepared by an anodic oxidation method and provided with directionally arranged straight-through pore channels; and the solid electrolyte filling body is filled in the straight-through pore channels of the porous aluminum oxide matrix and consists of polymer electrolyte containing lithium salt. The preparation method comprises the following steps: S1, preparing a porous alumina matrix: preparing the porous alumina matrix with a straight-through pore channel by an anodic oxidation method; s2, preparing a polymer electrolyte solution: dissolving a polymer matrix and a lithium salt in a proper amount of solvent, and uniformly stirring to form a transparent pre-polymerized solution; s3, vacuum-assisted impregnation and filling: immersing the porous alumina matrix into the pre-polymerization liquid, and filling the pre-polymerization liquid into a straight-through pore channel of the porous alumina matrix in a vacuum environment; and S4, film forming and curing: under the protection of inert atmosphere, removing the solvent in a heating manner, so that the interior of the straight-through pore channel is dried to form the solid-state composite electrolyte diaphragm.

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.

The invention belongs to the technical field of new material preparation, and discloses a preparation method of large-size alumina-based anti-bullet ceramic. Aiming at the defects that the traditional large-size ceramic is easy to crack and insufficient in toughness, the invention provides a dual toughening mechanism and an innovative process: nano monoclinic zirconium oxide is subjected to stress-induced phase change toughening, an aluminum oxide matrix inhibits premature phase change, and energy is absorbed at proper time during crack propagation; the flaky aluminum oxide single crystals are distributed in a non-uniform net shape through a coating process, the toughness is improved through crack deflection and a bridging mechanism, and meanwhile, the compactness of a matrix is prevented from being influenced; a porous structure is formed through the vacuum degumming process, internal stress is relieved, and the yield of 500 mm oversized ceramic is remarkably increased. The obtained product has high hardness and excellent impact resistance, and the technical problems that large-size aluminum oxide ceramic is prone to deformation and poor in toughness are solved.

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 present application relates to a kind of titanium sol, the Y type molecular sieve catalytic material for improving FCC total liquid recovery and its preparation method, the Y type molecular sieve catalytic material is obtained by the hydrothermal crystallization of titanium-containing reactive microspheres, with the dry base weight of titanium-containing reactive microspheres as benchmark, the titanium-containing reactive microspheres contain 85-98 wt.% alumina matrix and 2-15 wt.% titanium dioxide, and the titanium dioxide includes sharp titanium type titanium dioxide.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 conversion rate and total liquid recovery of raw oil catalytic cracking.

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 discloses a preparation method of high-performance alumina material, the alumina material and application thereof, and the preparation method comprises the following steps: (1) immersing a pretreated alumina matrix in an aluminum-based inorganic salt solution; (2) calcining the immersed alumina matrix at high temperature to obtain the high-performance alumina material. In the application, the alumina matrix raw material is pretreated to remove impurities on the surface and in the pores of the matrix, then the pretreated alumina matrix is immersed in the aluminum-based inorganic salt solution, so that aluminum ions fill the atomic vacancies in the matrix, and then the aluminum-based inorganic salt permeated into the pores of the matrix is converted into aluminum-based oxide through calcination to fill the pores, so that the obtained alumina material has increased compactness and obviously improved mechanical strength. Meanwhile, small alumina particles are formed on the surface of the alumina material to form physical isolation between active sites, and reduction of catalyst performance caused by aggregation of noble metal particles at high temperature is reduced.

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.

A method for preparing and surface sealing porous alumina ceramics. The present invention is intended to solve the problems of high sintering temperature and difficult density control in the current preparation methods of porous alumina substrates. Preparation and surface sealing method: 1. Mixing small-particle alumina powder with a particle size of 10-200nm and large-particle alumina powder with a particle size of 100-1000nm; 2. Molding the mixed powder; 3. Sintering the green body; 4. Mixing nano-alumina sol with added alumina powder; 5. Immersing the porous alumina substrate in the mixed slurry for vacuum impregnation treatment; 6. Drying treatment; 7. Heat treatment. The present invention adjusts the porosity and mechanical properties of the porous alumina substrate to achieve an optimal balance by controlling the addition amount of large-particle alumina powder and the sintering temperature. The surface pores are effectively sealed by the penetration of nano-alumina sol to form a uniform sealing layer, thereby extending the service life of the composite material.

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 relates to the technical field of high-temperature sintering, and discloses a high-radiation energy-saving composite kiln furniture and a surface strengthening method thereof.The surface strengthening method comprises the following steps that a base body is formed, cordierite, mullite and a sintering aid are mixed in proportion, and after dry pressing forming is conducted, sintering is conducted to form a porous green body; preparing a gradient radiation coating; microstructure regulation and control: carrying out high-temperature heat treatment on a coating system to promote grain boundary diffusion and reduce internal stress; according to the gradient coating structure, through the thermal expansion coefficient gradient design of the heterogeneous material, stress buffer transition is formed between the base body and the functional layer, the interface shear stress generated by high-temperature thermal circulation is relieved, and the cracking risk of the coating is reduced; meanwhile, a chromic oxide solid solution in the functional layer is stably combined with the aluminum oxide matrix through a lattice diffusion mechanism, the radiation efficiency of the middle-infrared band is enhanced, titanium dioxide particles in the nanometer reflecting layer generate selective light scattering in the near-infrared band, the full-band heat energy management efficiency is cooperatively improved, and the comprehensive energy-saving characteristic of the kiln furniture is enhanced.

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.

This invention relates to the field of ceramic insulator materials, specifically a suspension ceramic insulator, comprising a ceramic body, an iron cap, and a steel foot. The ceramic body includes an alumina matrix and a first coating and a second coating extending outward from the surface of the alumina matrix. The first coating comprises nano-alumina, nano-titanium dioxide, silica powder, and modified water glass. The second coating comprises nano-oxide particles, nano-titanium dioxide, aminated carbon quantum dots, and ATiO3, wherein A is any one or more combinations of Zn, Ca, and Sr. The insulator prepared by this invention exhibits good self-cleaning properties, indicating that dirt is difficult to adhere to the surface of the insulator, thus exhibiting lower ESDD and NSDD values ​​and strong resistance to surface flashover.

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.