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United States Patent | 5,059,563 |
Khazai ,   et al. | October 22, 1991 |
Metal boride powders can be produced with a predetermined particle size by controlling reaction conditions. The metal boride powder is produced by reacting a solid boron source, a metal source and a reductant under conditions sufficient to produce a metal boride powder with a particle size correlating to that of the solid boron source. The reaction is preferably stopped after the formation of products but before any appreciable crystal growth occurs.
Inventors: | Khazai; Bijan (Midland, MI); Moore; William G. (Midland, MI) |
Assignee: | The Dow Chemical Company (Midland, MI) |
Appl. No.: | 217926 |
Filed: | July 12, 1988 |
Intern'l Class: | C04B 035/52 |
Field of Search: | 501/87,96,93 264/56,65 423/289 |
2613154 | Oct., 1952 | Montgomery | 501/87. |
2957754 | Oct., 1960 | Nicholson | 23/204. |
3041142 | Jun., 1962 | Van Der Beck et al. | 23/204. |
3096149 | Jul., 1963 | Gruber. | |
3244482 | Apr., 1966 | Culbertson et al. | 23/204. |
3328127 | Jun., 1967 | Byrns | 23/204. |
4282195 | Aug., 1981 | Hoekje | 423/289. |
4379852 | Apr., 1983 | Watanabe et al. | 501/87. |
4503021 | Mar., 1985 | Brynestad et al. | 423/297. |
4670408 | Jun., 1987 | Petzow et al. | 501/87. |
Foreign Patent Documents | |||
115702 | Aug., 1984 | EP. |
Zavitsanos, et al. "Synthesis of Titanium Diboride by a self-propagating system", Ceram, Eng. Sci. Proc. pp. 624-633. McCauley et al., "Simultaneous praparation and self-sintering of materials in the system, Ti-B-C", Ceram. Eng. Sci. Proc. pp. 538-54. Brynestad et al., Synthesis of Submicron Titanium Diboride Powders, 19 High Temperature Science 41 (1985). Kim et al., TiB.sub.2 Powder Production for Engineered Ceramics, 6 Ceram. Eng. Sci. Proc. 1313 (1985). |