98 results about "Aluminum Oxide Paste" patented technology

There is provided a tool at least partly coated with at least two refractory layers of which one of the said layers is a fine-grained α-Al₂O₃-layer which is the top layer along the cutting edge-line and the other a TiC_xN_yO_z- or a ZrC_xN_y-layer being the top layer on the clearance face. The coated tool exhibits excellent flank and crater wear and high resistance to flaking, particularly when used for machining of low carbon steel and stainless steel. Used cutting edges can easily be identified by the naked eye.

The invention discloses a method for coating a high-nickel ternary material with aluminum oxide and boron oxide. The method includes the steps: 1) mixing an aluminum oxide precursor and water to prepare aluminum oxide coating liquid; 2) mixing the high-nickel ternary material with the aluminum oxide coating liquid to obtain aluminum oxide coating turbid liquid; 3) performing solid-liquid separation on the aluminum oxide coating turbid liquid, and drying obtained solid materials to obtain dry materials; 4) mixing the dry materials and a boron-containing compound and then sintering the dry materials and the boron-containing compound to obtain the finished high-nickel ternary material coated with the aluminum oxide and the boron oxide. According to the treatment method, washing and coating are combined, surface impurities of the high-nickel ternary material can be more effectively removed, coating is performed in a water phase, a coating can more uniformly cover the surface of the material, and further a positive electrode material with a good electrical performance is obtained. According to the coating method, process steps can be simplified, tempering temperature is reduced, tempering time is shortened, production cycle can be shortened, and production cost is saved.

The invention discloses a preparation method of graphene-nanosheet-reinforced alumina ceramic, which uses graphene nanosheets as a reinforcing phase and alumina as a substrate. The method comprises the following steps: filling alumina powder into a planetary ball mill tank using alumina balls as milling balls, thereby obtaining required alumina slurry; dissolving graphene nanosheets and a dispersing agent sodium naphthalene sulfonate in alkaline distilled water to form a water solution, applying ultrasonic in a ultrasonic cleaning instrument, pouring into the alumina slurry, mixing and carrying out ball milling; and putting the powder mixture of the two substances in a graphite mold, carrying out hot pressed sintering in a multifunctional sintering furnace, keeping the temperature for some time, stopping heating, and naturally cooling to room temperature to obtain the finished product. The method disclosed by the invention is simple, and can easily implement large-scale production; and the product has the advantages of high strength, high toughness and lower cost.

The invention relates to a method for preparing a closed-pore porous heat-insulating alumina ceramic. According to the method, a powder which is prepared by adopting a hydrothermal synthesis method and is in a core-shell structure is added into alumina slurry as a pore forming agent to prepare an alumina ceramic, in the process of sintering an alumina ceramic blank, the carbon sphere as a core is removed under oxidization, the alumina layer as a shell and the alumina substrate are sintered compactly to form a magnesium-aluminium spinel together with a sintering additive, and the magnesium-aluminium spinel is pined into the grain boundary. Closed pores are introduced into the prepared alumina ceramic successfully, the rate of closed pores of the alumina ceramic is up to10-60%, and the rate of open pores is less than 5%. The thermal conductivity of the alumina ceramic is 0.1W/(m.K), and the usage temperature is over 1,400 DEG C. The method provided by the invention can be used for overcoming the defects that the existing process for preparing the porous ceramic by foaming is complex, too many additives are added, and the product is easy to powderize.

The present invention discloses preparation process of thermally conductive and electrically insulating silicone rubber composite material. The preparation process includes the following steps: 1. mixing tabular alumina and alcohol solution of polyglycol to prepare alumina slurry or powder; 2. mixing high temperature sulfurized silicone rubber, alumina slurry, hydroxyl silicone oil and vulcanizer in certain weight proportion; 3. sulfurizing and forming through molding at certain temperature to form required product; and 4. the secondary sulfurizing of the product in a forced air drying tank. The composite material of the present invention has raised thermal conductivity coefficient, high compatibility between alumina and silicone rubber, and low cost.

The invention belongs to the technical field of preparation of continuous fiber reinforced ceramic based composite materials, and particularly discloses a preparation method of a low-cost and high-efficiency aluminum oxide fiber reinforced aluminum oxide composite material. The method comprises the following specific steps: firstly, preparing a stable aluminum oxide slurry, then brushing the aluminum oxide slurry on degummed aluminum oxide fiber cloth, molding after mould pressing, drying to obtain an aluminum oxide fiber reinforced aluminum oxide composite material rough blank, and finally, sintering to obtain the aluminum oxide fiber reinforced aluminum oxide composite material. The preparation method provided by the invention has the characteristics of simple process and short preparation period, and the prepared aluminum oxide fiber reinforced aluminum oxide composite material has excellent high-temperature mechanical properties and thermal stability.

The invention provides a preparation method of alumina pellets through hot oil column moulding. The preparation method comprises the following steps: preparing an alumina suspension liquid from pseudo-boehmite powder, which is produced by an alkoxyl aluminium hydrolysis method, a first gelatinizing agent, and water, then adding an acid solution into the alumina suspension liquid to obtain alumina slurry, adding a second gelatinizing agent into the alumina slurry, evenly mixing, then dropwise adding alumina slurry into a hot oil column so as to form alumina pellets, directly collecting alumina pellets from the bottom end of the hot oil column, washing the collecting aluminum pellets by water, drying, and burning. The provided method has the advantages that the post treatment technology is simplified and the method can be applied to large scale industrial production.

The invention provides a method for preparing aluminum hydroxide micro-powder with a low oil absorption rate, which comprises the following steps of: taking a sodium aluminate solution as a raw material, adding a ground active seed crystal to the raw material, sorting and decomposing ultrathin aluminum hydroxide pulp, continuously heating the ultrathin aluminum hydroxide pulp for aging and decomposition, and then drying to obtain the aluminum hydroxide micro-powder with a low oil absorption rate. Sequential decomposition and aging are increased on the basis of the original technical processes for preparing the aluminum hydroxide micro-powder with the sodium aluminate solution, and the prepared aluminum hydroxide micro-powder has a low oil absorption rate and a high extrusion speed. The operation process is simple and feasible, and the product quality is obviously improved.

A pseudo-metallic fluorocarbon paint adopts polymer or inorganic substance-coated aluminum paste, solving the problems of darkening and peeling caused by insufficiency of alkali resistance of untreated aluminum powder paste used in the prior art. The pseudo-metallic fluorocarbon paint comprises composition I including hydroxyl fluorocarbon resin, the polymer or inorganic substance-coated aluminum paste, wetting and dispersing agent, cellulose acetate butyrate, anti-settling sagging agent and solvent; and composition II, hexamethylene diisocyanate (HDI) trimer, wherein, the proportion of composition I to composition II is 16-19:1. The pseudo-metallic fluorocarbon paint prepared by using such compositions including polymer or inorganic substance-coated aluminum paste, in such a proportion, has the advantages of extraordinary alkali and color-changing resistance, so in alkaline environment, aluminum powder erosion changes seldom occur. When being applied to building walls for coating protection, the paint has excellent color retention performance.

Techniques for manufacturing a single flexible cover to equip a display with touch screen capabilities are disclosed. The single flexible cover is easy to be applied to nearly all displays and maintains its durability on the displays. According to one aspect of the present invention, the single flexible cover includes at least three layers, a crystalline aluminum oxide layer, a polyethylene terephthalate (PET) film sensor stacking layer and an adhesive layer to bond the PET film sensor stacking layer to the crystalline aluminum oxide layer. The single flexible cover is produced by a manufacturing process including processes comprises: providing a foil as a substrate; coating the substrate with a set of materials including primarily aluminum oxide; curing the set of materials with heat to cause the set of materials to be crystallized to form the crystalline aluminum oxide layer; bonding the PET film sensor stacking layer to the crystalline aluminum oxide layer with optically clear adhesive (OCA); and applying anti-etching ink to top of the PET film sensor stacking layer. Then the foil and anti-etching ink are removed.

The invention discloses aluminium oxide slurry for surface passivation for a crystalline silicon solar cell and a preparation method for a passivating film. The slurry comprises the following components in parts by weight: 65-70 parts of aluminium oxide sol, 10-13 parts of complexing agent, 3-5 parts of cross-linking agent, 1-3 parts of thickening agent and 0.1-0.3 parts of flatting agent. A base material is coated with the aluminium oxide sol through a silk-screen printing mode to form a coating layer with a predetermined pattern; then the coating layer is dried and sintered to form a passivation layer with the predetermined pattern on the base material. The preparation method is simple, and all the preparation processes can be completed by using laboratory equipment; the aluminium oxide passivating film is manufactured on the back of a cell piece, so that the absorption on long-wavelength light of the cell is improved, the back surface compound of the cell is lowered, and the efficiency of the solar cell is improved.

The invention discloses a preparation method of a novel chip-type oxygen sensor. The preparation method comprises the following steps: manufacturing a zirconium oxide sensor matrix, printing an outer electrode Pt and an inner electrode Pt on the upper surface and the lower surface of the zirconium oxide sensor matrix, printing a porous protection layer on the outer electrode, drying and sintering; manufacturing a reference matrix by mixing aluminum oxide powder and silicon oxide or magnesium oxide powder, manufacturing a recessed cavity which is used as an air channel on the reference matrix and sintering; printing tungsten resistance paste on the bottom surface of the reference matrix, printing aluminum oxide paste on the surface of a heating electrode, drying and sintering; covering the reference matrix with a sensitive layer, coating high-temperature ceramic glaze between the sensitive layer and the reference matrix and sintering. According to the preparation method of the novel chip-type oxygen sensor, the structure of the chip-type oxygen sensor is simplified, the production cost is reduced and the insulating property between the heating electrode and the sensitive layer is improved ,so that the property of the chip-type oxygen sensor is improved.

The present invention provides α-alumina powders comprising α-alumina particles of which at least 80% of the α-alumina particles have a particle size of less than 100 nm. The invention also provides slurries, particularly aqueous slurries, which comprise α-alumina powders of the invention. The invention further provides methods of manufacturing α-alumina powders and α-alumina slurries of the invention and methods of polishing using same.

Aluminum oxide slurry used for the photocuring technique is disclosed. The slurry includes Al2O3 powder, a sintering aid the mass of which is 0.05-5% of the mass of the Al2O3 powder, a dispersing agent the mass of which is 1.0-2.0% of the mass of the Al2O3 powder, a compatilizer the mass of which is 0.75-1.25% of the mass of the Al2O3 powder, a monomer the mass of which is 25-30% of the mass of the Al2O3 powder, and a photoinitiator the mass of which is 0.75-1.25% of the mass of the monomer. The slurry has a high solid content and low viscosity and is uniform. A preparing method of the slurryis also disclosed.

The invention discloses a boehmite/aluminum oxide composite lithium ion battery coating electrode piece. Boehmite/aluminum oxide slurry is prepared from the following raw materials in percentage by mass: 0.5-1.3 parts of a surfactant, 0.5-1.0 parts of a thickening agent, 5.0-10.0 parts of a binder, 0.1-0.5 parts of a dispersing agent, 20.0-50.0 parts of a boehmite/alumina mixture, 2.0-6.0 parts ofa defoamer and 30.0-70.0 parts of a solvent. The invention further discloses a preparation method of the boehmite/aluminum oxide composite lithium ion battery coating electrode piece. The boehmite islow in price, the cost is greatly reduced, and the market competitive advantage is greatly improved; compared with a coated diaphragm, the coated electrode piece can save more space, and the energy density of batteries with the same volume is high.

The invention discloses a water-based one-component paint and a preparation method thereof. The water-based one-component paint is composed of the following raw materials: nano polyacrylic acid emulsion, water-based polyurethane emulsion, defoamer, dispersant, thickener, pigment, filler , alumina slurry, film-forming aids, pH regulator, anti-mold and bactericide and water; the water-based one-component coating obtained by the present invention has good fullness, good airtightness, excellent adhesion and fast drying, and anti-collapse Strong resistance and high hardness; the water-based one-component paint obtained by the present invention can be used directly by adding water, no use time limit, no water is added for use, and can be used as white putty without collapse; the water-based one-component white background obtained by the present invention The paint is a water-based green environmental protection product; the preparation method of the water-based one-component paint provided by the invention is simple in operation and convenient in preparation, and is suitable for large-scale industrial production.

Disclosed is an alumina slurry substantially including alpha-alumina particles and water, wherein the alpha-alumina particles satisfy all particle diameter distribution conditions (a) to (d) mentioned below, the alpha-alumina particles have an alumina purity of 90% by weight or more, the content of alumina in the slurry is 20% by weight or more and 50% by weight or less, and the slurry has a viscosity of 0.5 Pa·s or more and 15 Pa·s or less: condition (a): the average particle diameter is 1 μm or less, condition (b): particles having a particle diameter of less than 0.2 μm account for 7% by weight or less, condition (c): particles having a particle diameter of more than 1.5 μm account for 15% by weight or less, and condition (d): one or more frequency maximums exist in a particle diameter range of 0.1 μm or more and less than 0.5 μm.

The invention relates to an inorganic antibacterial material, in particular to an antibacterial application of a polycrystalline nanometer calcium-aluminum oxide of C12A7-O<->. The antibacterial material has broad-spectrum bacteriostatic and bactericidal actions, i.e. has the action for exterminating golden staphylococcus, colon bacilli and hay bacillus black spore varieties at a room temperature. The polycrystalline nanometer calcium-aluminum oxide has an extermination rate of 100 percent per hour for the golden staphylococcus and the colon bacilli and has an extermination rate of 96 percent per hour for the hay bacillus black spore varieties when a load weight on a unit area of a load material is heavier than or equal to 0.005g/cm<2>; the grain diameter of the polycrystalline nanometer calcium-aluminum oxide is 10- 200nm, the load material can be textile, plastic products, ceramics, rubber products, or the like, and the room temperature means natural room-temperature conditions in four seasons. The polycrystalline nanometer calcium-aluminum oxide has the advantages of strong antibacterium function, no toxicity, high temperature resistance and strong stability and can be widely applied to fields, such as antibacterial textile, antibacterial plastics or ceramics, rubber products, and the like.

The invention relates to the technical field of metal processing, in particular to aluminum oxide slurry as well as a preparation method and application thereof. According to the invention, a two-stage grinding process including ball milling and sanding is adopted, and a proper mixed dispersing agent is selected, so that the obtained product has regular and smooth particle morphology, narrow particle size distribution and small particles; after precise filtering, a product is in the form of slurry and can be used without drying, so that the defect of agglomeration of false particles of the traditional aluminum oxide powder is overcome, and the aluminum oxide polishing powder has higher dispersity and stability, is not easy to precipitate, ensures the polishing effect, can replace high-quality aluminum oxide polishing powder processed by an airflow mill, and can be used for high-precision mirror polishing occasions such as stainless steel mirror polishing and sapphire mirror polishing.

The invention relates to a method for preparing ceramic filters with a hot pressure casting process. The method comprises steps as follows: alumina powder with proper grain size distribution and paraffin are mixed in a certain ratio, one or more pore-forming agents such as carbon powder, wood chips, aluminum salt, titanium salt, magnesium salt, sodium salt, lanthanum salt, cerium salt and the likeare added according to the size and distribution of required pores, and alumina slurry is configured. Under certain pressure, the slurry is injected into a mold meeting the shape requirement for forming, and various special-shaped filter bodies meeting the requirements are prepared; the bodies are subjected to removal burning, the pore-forming agents are removed, and porous bodies are obtained; the porous bodies are sintered at the high temperature, and the special-shaped alumina ceramic filters are obtained. In the whole process, no special mechanical equipment is required, the pore size anddistribution and the shapes of the filters are controllable, and the method is an ideal process for preparing high-porosity, high-strength and special-shaped ceramic filters.

The invention discloses an aluminum oxide and barium sulfate composite membrane for a lithium ion battery. The aluminum oxide and barium sulfate composite membrane for the lithium ion battery comprises a basement membrane and coatings coated on the single side or double sides of the basement membrane, and the coatings comprise an aluminum oxide slurry layer and a barium sulfate slurry layer in sequence; the aluminum oxide slurry layer is prepared from, by weight, 100 parts of aluminum oxide powder with nanometer particles, 3-10 parts of binders, 0.2-1 part of surfactant and 200-1000 parts of solvent; the barium sulfate slurry layer is prepared from, by weight, 100 parts of barium sulfate powder with nanometer particles, 3-10 parts of binders, 0.2-1 part of surfactant and 200-1000 parts of solvent. According to the aluminum oxide and barium sulfate composite membrane for the lithium ion battery, a double-coating method is adopted initiatively to prepare the ceramic composite membrane, the aluminum oxide and barium sulfate composite membrane for the lithium ion battery is suitable for being used in high or low temperature environment with the temperature ranging from -20 DEG C to 80 DEG C, the outstanding performance in the solution preserving property and safety aspects is achieved, the manufacturing cost is moderate, and the aluminum oxide and barium sulfate composite membrane for the lithium ion battery is very suitable for being used in power batteries of new energy vehicles, and the great market value is achieved.