Compositions: ceramic – Ceramic compositions – Refractory
Patent
1988-08-05
1990-08-14
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Refractory
501 95, 501127, 501 86, 501153, C04B 3518
Patent
active
049487663
ABSTRACT:
A process in which (1) AlF.sub.3 and SiO.sub.2 or AlF.sub.3, SiO.sub.2, and Al.sub.2 O.sub.3 powders are formed into a green body of a desired shape and size; (2) the green body is heated at 700.degree. C. to 950.degree. C. in an anhydrous SiF.sub.4 atmosphere to form barlike topaz crystals; and then (3) heated in an anhydrous SiF.sub.4 atmosphere at about 1150.degree. C. to 1700.degree. C. to convert the barlike topaz crystals to needlelike single crystal mullite whiskers which form a porous, rigid felt structure. The felt has the same shape as the green body with about 1.5 or less percent change in linear dimensions. The felt can be used as preforms for ceramic-matrix or metal-matrix composites or by itself as thermal insulation.
REFERENCES:
patent: 4585500 (1989-04-01), Minjolle et al.
Nemets et al., Development of a Ceramic Material Self-Reinforced with Nee-Shaped Mullite Crystals, Tr.-Mosk. Khim-Tekhnol. Inst. im. D. I. Mendeleeva, 1882, 123, 30-3 (Russian).
Haught Deborah A.
Talmy Inna G.
Dixon Jr. William R.
Hollenbeck Sue
Johnson Roger D.
The United States of America as represented by the Secretary of
Walden Kenneth E.
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