Compositions: ceramic – Ceramic compositions – Refractory
Patent
1983-10-14
1987-05-19
Lechert, Jr., Stephen J.
Compositions: ceramic
Ceramic compositions
Refractory
501126, 501127, 501153, 501154, 252518, C04B 3558
Patent
active
046668730
ABSTRACT:
A process for making a structural ceramic article, such as, an electromagnetic window, is disclosed, wherein the ceramic article is comprised of a densified mixture of not less than 50% by volume aluminum nitride and up to about 50% by volume boron nitride. The ceramic article of the present invention may be used as a shield or protective barrier such as an electromagnetic window for communication or detection devices on high speed transportation or delivery vehicles passing through extremely hostile environments, where it exhibits radar transparency, congruent vaporization kinetics, tailorable dielectric properties, improved thermal shock resistance, improved mechanical toughness and strength, improved spall resistance, improved recession rate, i.e. erosion rate and ablation rate, and high refractoriness.
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patent: 3544486 (1970-12-01), Passmore
patent: 3718490 (1973-02-01), Morgan
patent: 3915900 (1975-10-01), Reinmuth et al.
patent: 4519966 (1985-05-01), Aldinger et al.
patent: 4539298 (1985-09-01), Komeya et al.
Morris, Jr. John R.
Tanzilli Richard A.
Amgott Allen E.
General Electric Company
Lechert Jr. Stephen J.
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