Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1985-07-23
1987-09-01
Bell, Mark L.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
501 92, 264 65, C04B 3556, C04B 3558
Patent
active
046907904
ABSTRACT:
Corrosion and thermal shock resistant high silicon nitride content silicon nitride-bonded silicon carbide article, e.g., nozzle for transfer of molten metal, is prepared by combining finely divided silicon metal, silicon carbide grain with processing aids, forming the mixture into an article, and firing the article in nitrogen. Even higher silicon nitride content is obtained by crushing the article to obtain a precursor grog material, combining this grog with more finely divided silicon metal and processing aids, forming the mixture into an article and firing in nitrogen. Silicon nitride content of up to about 70 weight percent may be obtained with single mixing and firing; up to about 98 weight percent with use of nitrided precusor grog, remixing and firing. With reiteration, a silicon nitride content of essentially 100 weight percent can be approached.
REFERENCES:
patent: 2750268 (1956-06-01), Erasmus
patent: 2752258 (1956-06-01), Swentzel
patent: 3222438 (1965-12-01), Parr et al.
patent: 4164528 (1979-08-01), Yajima et al.
patent: 4560668 (1985-12-01), Hunold et al.
Bell Mark L.
Ronyak D. M.
Stemcor Corporation
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