58 results about "Alumina matrix" patented technology

The invention relates to the technical field of battery materials, and particularly provides porous aluminum oxide powder applied to a lithium ion battery and a preparation method of the porous aluminum oxide powder. The porous alumina powder of the present application comprises: a porous alumina matrix, the aperture of which is gradually reduced from the surface to the center; the silane coupling agent modification layer covers at least part of the surface of the porous aluminum oxide matrix, and a silane coupling agent has a Si-O-Al bonded network structure; the fluorocarbon hydrophobic layer is coated on at least part of the surface of the silane coupling agent modification layer, and the fluorocarbon hydrophobic layer is of a perfluoroalkyl chain structure. According to the preparation method, the wettability, the interface stability and the moisture resistance of the electrolyte are synchronously improved through cooperation of a gradient aperture structure and silane-fluorocarbon double-layer modification.

The invention relates to the technical field of catalysts, and particularly provides a methane dry reforming catalyst carrier, a catalyst and a preparation method, the carrier is composed of an alumina matrix, a cerium oxide and a lanthanum oxide doped in the alumina matrix, and an anionic surfactant, and the catalyst comprises the carrier and active metal nickel loaded on the surface of the carrier, the problems that a traditional ZrO2 or 3D-Ti-Ce-O carrier is high in cost and complex in process are solved through La / Ce coordinated regulation and control of oxygen vacancy concentration, improvement of metal dispersity by a surfactant and a low-cost coprecipitation process.

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 invention relates to the technical field of battery materials, and specifically provides a porous alumina powder for use in lithium-ion batteries and a preparation method thereof; the porous alumina powder of the present application includes: a porous alumina matrix with pore diameters gradually decreasing from the surface to the center; a silane coupling agent modification layer that covers at least part of the surface of the porous alumina matrix, and the silane coupling agent has a Si-O-Al bonding network structure; a fluorocarbon hydrophobic layer that coats at least part of the surface of the silane coupling agent modification layer, and the fluorocarbon hydrophobic layer is a perfluoroalkyl chain structure. The present application synergistically modifies the gradient pore structure with a double layer of silane-fluorocarbon to simultaneously improve the electrolyte wettability, interface stability, and moisture resistance.

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.

The present invention discloses an alumina carrier, a hydrogenation protective agent and a preparation method thereof. The alumina carrier of the present invention comprises an alumina substrate and curved lamellar alumina grown on the surface of the substrate, wherein the curved lamellar alumina has a length of 0.1-0.8 μm and a thickness of 10-20 nm; the curved lamellar alumina is accumulated to form pores of 100-500 nm. The preparation method of the alumina carrier of the present invention comprises the following contents: (1) impregnating the alumina substrate with an aluminum salt solution, followed by drying and calcining; (2) immersing the material calcined in step (1) in a sealed hydrothermal treatment in a propylene oxide aqueous solution, and drying and calcining the treated material to obtain an alumina carrier. The alumina carrier contains curved lamellar alumina, and the hydrogenation protective catalyst prepared using the alumina as a carrier has high decalcification and iron activity, as well as high nickel removal, vanadium removal and desulfurization activity.

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 present invention provides a support for a propane dehydrogenation catalyst, a catalyst, and a preparation method thereof. The support comprises: an alumina matrix, the alumina matrix being formed by stacking alumina particles, the average particle size of the alumina particles being 5 to 30 nm; and a metal oxide component selected from at least one of oxides of Group IVB metals and oxides of Group VIII metals, and dispersed on the alumina matrix. The specific surface area of ​​the support is 100 to 210 m 2 / g; average pore diameter of 8.0-12.5nm; pore volume of 0.3-0.6mL / g; porosity of 20%-50%. The carrier provided by the present invention has unique structural characteristics and physical properties that can help increase the loading of subsequent active components and auxiliary components, thereby improving the activity of the catalyst.

The invention belongs to the technical field of catalyst carriers, and particularly relates to a modified alumina carrier and a preparation method and application thereof, the modified alumina carrier comprises a modified alumina matrix and a carbon layer coating the surface of the modified alumina matrix; the mass of the carbon layer is 10-20% of the mass of the modified aluminum oxide matrix; the modified aluminum oxide matrix is prepared from the following components in percentage by mass: 1.5 to 3 percent of tin oxide, 8 to 11 percent of alkaline earth metal oxide and the balance of gamma-Al2O3. The mechanical strength and electron conductivity of the modified alumina carrier are increased by doping tin oxide and alkaline earth metal oxide, the specific surface area of the modified alumina carrier is increased by the carbon layer coating the surface of the modified alumina matrix, and the conductive network structure formed by the carbon layer has good conductivity. The electron conductivity of the modified aluminum oxide carrier is further improved.

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 invention provides an aluminum oxide three-dimensional nanometer grid structure and a preparation method and application thereof, and belongs to the technical field of nanometer structure materials. The aluminum oxide three-dimensional nano-grid structure provided by the invention comprises an aluminum oxide matrix with transverse and longitudinal three-dimensional interconnected pore structures and fillers filled in the transverse and longitudinal three-dimensional interconnected pore structures, the color and radiation cooling power are adjusted by storing and removing the filler in the pore channel structure. A series of transverse channels are selectively etched in a traditional porous anodic aluminum oxide template, a three-dimensional interconnected anodic aluminum oxide network is constructed, liquid or solid filler is filled and removed in the three-dimensional channels, and the periodic refractive index of the thin film structure is dynamically adjusted to achieve switchable optical and thermal properties, so that the performance of the thin film is improved. Therefore, the dynamic control of the color and the cooling power is realized.

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.

This invention relates to the field of alumina materials technology, specifically providing an alumina-based material with multi-scale particles and its preparation method. The method includes: mixing Al2O3, Ni3Ti, and a CuO / SiC composite material, pressing them into shape, and then vacuum hot-pressing and sintering to obtain an alumina-based material with multi-scale particles. Compared with existing technologies, this invention adds Ni3Ti and CuO / SiC composite material to the alumina matrix, which lowers the sintering temperature while improving the density of the alumina-based material, thereby improving its mechanical properties. Experimental results show that the fracture toughness of the alumina-based material with multi-scale particles prepared by the method provided by this invention is ≥6.7 MPa·m. 1 / 2 Flexural strength ≥746.1MPa, microhardness ≥1821HV.

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.