JP2003137658A5 - - Google Patents

Claims (16)

A method for producing an aluminum oxide powder, comprising: a step of mixing at least two types of aluminum oxides having different average primary particle sizes; and a step of pulverizing the mixed powder. The method for producing an aluminum oxide powder according to claim 1, wherein the step of mixing aluminum oxide and the step of pulverizing are performed simultaneously. That at least two or more types of aluminum oxides having different average primary particle sizes are powder A having an average primary particle size of more than 0.25 μm to 0.5 μm and powder B of more than 0.5 μm to 1 μm. The method for producing an aluminum oxide powder according to claim 1 or 2. At least two or more kinds of aluminum oxides having different average primary particle diameters are in a ratio when the total aluminum oxide is 100 parts by mass, the powder A is in the range of 50 to 90 parts by mass, and the powder B is 10 to 10 parts by mass. It exists in the range of 50 mass parts, The manufacturing method of the aluminum oxide powder in any one of Claims 1-3 characterized by the above-mentioned. At least two or more types of aluminum oxides having different average primary particle diameters are in a ratio when the total aluminum oxide is 100 parts by mass, and the total of powder A and powder B is in the range of 90 parts by mass to 100 parts by mass. The method for producing an aluminum oxide powder according to any one of claims 1 to 4, wherein: The aluminum oxide according to any one of claims 1 to 5, wherein at least two kinds of aluminum oxides having different average primary particle diameters each have an average secondary particle diameter in the range of 30 µm to 120 µm. Powder manufacturing method. The method for producing an aluminum oxide powder according to any one of claims 1 to 6, wherein a crushing strength (R ratio x crushing time) in the step of crushing the mixed powder is 90 or more. . Glycols are added, The manufacturing method of the aluminum oxide powder of any one of Claims 1-7 characterized by the above-mentioned. The amount of glycols added is in the range of 0.01 parts by weight to 1 part by weight, based on the total amount of aluminum oxide being 100 parts by weight. The manufacturing method of the aluminum oxide powder as described in 2. Magnesium compounds are added, The manufacturing method of the aluminum oxide powder of any one of Claims 1-9 characterized by the above-mentioned. The amount of magnesium compounds added is the value when the magnesium compounds are converted to magnesium oxide, and the ratio when the total aluminum oxide is 100 parts by mass, in the range of 0.01 parts by mass to 0.1 parts by mass The method for producing an aluminum oxide powder according to any one of claims 1 to 10, wherein: The aluminum oxide powder is press-molded at 98 MPa and sintered at 1550 ° C. or higher, the sintered density is 3.91 g / cm ³ or higher, and the shrinkage is 17.0% or lower. Aluminum oxide powder to be used. The aluminum oxide powder manufactured by the manufacturing method of any one of Claims 1-11. A refractory containing the aluminum oxide powder according to claim 12 or 13. An electronic component comprising the aluminum oxide powder according to claim 12 or 13. A machine part comprising the aluminum oxide powder according to claim 12 or 13.