11 results about "Alumina hydrate" patented technology

The present disclosure provides a sintered aluminum foil and a preparation method thereof, the preparation method comprising: performing a post-first aging on an initial sintered aluminum foil; performing a first heat treatment on the initial sintered aluminum foil; performing a microwave heating treatment on the initial sintered aluminum foil; and performing a post-second aging on the initial sintered aluminum foil. By performing the microwave heating treatment, the present disclosure can realize directional heating on the part of the sintered aluminum foil oxide film with high dielectric loss (i.e. the oxide film with high water content), thereby improving the heating efficiency, improving the depolarization effect, making the hydrated aluminum oxide film fully heat and dehydrate and performing crystal type conversion, obtaining an aluminum oxide film with higher dielectric constant, and avoiding the problem of defects in the traditional sintered aluminum foil due to the complex structure and the difficulty of the oxide film to fully crystallize and convert.

The invention discloses a preparation method of polyhedral single crystal aluminum oxide, and relates to the technical field of preparation of inorganic functional powder materials. The method comprises the following steps: S1, providing polyhedral single crystal alpha-Al2O3 with D50 of 0.1-20 [mu] m; S2, uniformly mixing an alumina hydrate precursor with a composite mineralization system, wherein the composite mineralization system comprises one or more of halide, sulfate, borate, phosphate and low-eutectic molten salt thereof. According to the preparation method of the polyhedral single crystal aluminum oxide, a polyhedral alpha-Al2O3 seed with D50 of 5-100 microns, facet fidelity and high single crystal rate is obtained through epitaxial amplification of small-size polyhedral single crystal alpha-Al2O3 at 1250-1600 DEG C, and the seed has clear crystallographic orientation and regular geometric shape; the preparation method comprises the following steps: constructing a seed-precursor-mineralization composite material which is a morphology memory seed together with an alumina hydrate and a composite mineralization system, and carrying out temperature programming on the composite material to obtain powder;

Processes for reclaiming and recycling solid surface into a desired manufacturer's solid surface manufacturing process and methods used therein; specifically methods for identifying a manufacturing source of a test sample of solid surface comprising an acrylic polymeric matrix and alumina trihydrate (ATH), including generating a reference set of characteristics related to either (1) the percent area covered by the ATH particles, the ATH particle count, and the minor axis length of a best-fit ellipse to ATH particles, or (2) the aluminum, calcium, and zinc concentration in reference samples of solid surface from multiple known manufacturing sources, or some combination of (1) and (2); obtaining the test sample and non-destructively determining certain characteristics of the test sample; comparing those characteristics with the appropriate reference set; and identifying the manufacturing source of the test sample.

The application relates to a preparation method of high-strength wear-resistant antibacterial stainless steel and belongs to the technical field of metal matrix composites, which comprises the following steps: preparing stainless steel powder with a particle size of 15-53 mu m, mixing the stainless steel powder with micron-grade SiC which has been subjected to surface modification treatment, wet-milling in a ball mill tank to obtain primary wet powder, and then drying to obtain completely dry primary powder; weighing equal mass of aluminum oxide monohydrate and aluminum hydroxide, mixing the two into an aqueous solution, then adding the primary powder, wet-milling in a ball mill tank to obtain secondary wet powder, and then drying to obtain completely dry secondary powder; roasting the secondary powder in a vacuum tube furnace to in-situ generate nano-aluminum oxide; and then pressure forming and vacuum sintering to obtain the target product. The micron-grade SiC particles and nano-grade Al2O3 particles are uniformly and dispersedly distributed in the stainless steel matrix, and the hardness and wear resistance of the antibacterial stainless steel are significantly improved.

The invention relates to the field of butyl rubber, and discloses a composition for preparing a halogen-free flame-retardant thermoplastic elastomer, the halogen-free flame-retardant thermoplastic elastomer as well as a preparation method and application of the halogen-free flame-retardant thermoplastic elastomer. The composition contains nitrile rubber, polypropylene, a vulcanizing agent, a flame retardant, a compatibilizer and an inorganic filler, wherein based on 100 parts by weight of the nitrile rubber, the content of the polypropylene is 20-80 parts by weight, the content of the vulcanizing agent is 0.05-2 parts by weight, the content of the flame retardant is 10-50 parts by weight, the content of the compatibilizer is 5-30 parts by weight, the content of the inorganic filler is 5-20 parts by weight, and the content of the flame retardant is 0.5-2 parts by weight. The flame retardant contains diammonium hydrogen phosphate, zinc borate, dicyandiamide and alumina trihydrate. The halogen-free flame-retardant thermoplastic elastomer prepared by using the composition of the halogen-free flame-retardant thermoplastic elastomer has high flame retardant property, mechanical property and oil resistance.

The invention relates to the technical field of electrical insulating materials, and discloses a super-hydrophobic nano-structure coating for an electrical insulator and a preparation method of the super-hydrophobic nano-structure coating. The static contact angle of the coating ranges from 117 degrees to 155 degrees, and the leakage current peak value is smaller than 60 mA. A material A for forming the coating contains modified nano silicon dioxide, polysiloxane and aluminum oxide trihydrate. The super-hydrophobic nano-structure coating provided by the invention has excellent super-hydrophobicity and electric leakage resistance, and can effectively reduce the risks of partial discharge, flashover and the like of an electric insulator in a polluted environment.

Processes for reclaiming and recycling solid surface into a desired manufacturer's solid surface manufacturing process and methods used therein; specifically methods for identifying a manufacturing source of a test sample of solid surface comprising an acrylic polymeric matrix and alumina trihydrate (ATH), including generating a reference set of characteristics related to either (1) the percent area covered by the ATH particles, the ATH particle count, and the minor axis length of a best-fit ellipse to ATH particles, or (2) the aluminum, calcium, and zinc concentration in reference samples of solid surface from multiple known manufacturing sources, or some combination of (1) and (2); obtaining the test sample and non-destructively determining certain characteristics of the test sample; comparing those characteristics with the appropriate reference set; and identifying the manufacturing source of the test sample.

The invention provides a sintered aluminum foil and a preparation method thereof. The preparation method comprises the following steps: performing post-formation on an initial sintered aluminum foil; performing first heat treatment on the initial sintered aluminum foil; carrying out microwave heating treatment on the initial sintered aluminum foil; and carrying out secondary formation on the initial sintered aluminum foil. Through microwave heating treatment, directional heating can be carried out on the part with high dielectric loss (namely the oxidation film with high water content) in the sintered aluminum foil oxidation film, so that the heating efficiency is improved, the depolarization effect is improved, the hydrated alumina film fully absorbs heat, is dehydrated and is subjected to crystal form conversion, and the alumina film with a higher dielectric constant is obtained; the problem that defects exist due to the fact that a traditional sintered aluminum foil is complex in structure and an oxidation film is difficult to fully crystallize and convert is solved.

The application relates to a preparation method of an alumina spinning gel and belongs to the technical field of colloidal materials. According to the technical scheme, an inorganic aluminum source is used to replace a traditional organic aluminum source, and the reaction ratio of aluminum sulfate and sodium bicarbonate is controlled under low-temperature conditions to synthesize an alumina hydrate with high activity; further, the temperature, time and material ratio of a carboxylation, polymerization and aging process are accurately controlled to make aluminum carboxylate self-polymerize to form high-viscosity high-polymer aluminum carboxylate without additional addition of a thickening agent and a spinning aid, so that the performance of the alumina spinning gel is ensured, the process complexity is simplified, and finally the preparation of the alumina spinning gel with low cost and high performance is realized.

Processes for reclaiming and recycling solid surface into a desired manufacturer's solid surface manufacturing process and methods used therein; specifically methods for identifying a manufacturing source of a test sample of solid surface comprising an acrylic polymeric matrix and alumina trihydrate (ATH), including generating a reference set of characteristics related to either (1) the percent area covered by the ATH particles, the ATH particle count, and the minor axis length of a best-fit ellipse to ATH particles, or (2) the aluminum, calcium, and zinc concentration in reference samples of solid surface from multiple known manufacturing sources, or some combination of (1) and (2); obtaining the test sample and non-destructively determining certain characteristics of the test sample; comparing those characteristics with the appropriate reference set; and identifying the manufacturing source of the test sample.

This application relates to an aluminum-based nanomaterial and its preparation method. The method involves synthesizing a mixture of aluminum sulfate and a precipitant, filtering it, and collecting a nano-alumina hydrate filter cake. A potential-changing agent is then added to the nano-alumina hydrate filter cake, and the mixture is stirred. This yields an aluminum-based nanomaterial with extremely low sulfate content. Specifically, by introducing the potential-changing agent during the slurrying process of the nano-alumina hydrate filter cake, the system's zeta potential is converted from negative to 0 or positive, disrupting the diffuse double-electron layer structure formed by the combination of sulfate and the nano-alumina hydrate filter cake, releasing sulfate ions, and thus achieving the purpose of removing sulfate ions. Because the sulfate content of this aluminum-based nanomaterial is less than 0.01%, it can effectively eliminate the negative impact of this impurity on the core performance of the material, ensuring the material's adaptability and service stability in high-end fields, and providing key support for the breakthrough of aluminum-based nanomaterials in high-value-added applications.