The effort was divided into three temperature ranges. In the highest 3000F and high, the sintering characteristics of pure alumina, and plus additives, and pure spinel were studied. Pure alumina plus minor additions of magnesia have attained maturity at 2840F. Matured spinel has been realized at 2650F. In the temperature range 2600 to 3000F the presintered approach to the prereacted materials technique was used. Compositions in the high alumina portion ...
Devitrified barium titanate ceramics on flame spraying barium titanate into distilled water, in order to make a glass, approximately 3.5% baria desolves in the water. This occurred with the several barium titanates investigated. Attempts to minimize or eliminate the solution of baria during this operation have failed. Ultra low loss ceramics: the system Lanthana-AluminaSilica was evaluated for ceramic bodies. Crystallinge ceramics research is discussed. Study of boron nitride and the ...
Attempts were made to develop refractory ceramics for radomes that can be processed at temperatures considerably lower than their maximum use temperature. High alumina bodies containing 94 and 96% Al2O3, were developed with excellent engineering properties when matured in the range 2600 to 2800 F. The low maturing temperature and the excellent physical properties of these bodies were attributed to a presintering process. Studies were initiated on the mechanisms that ...
Effort was made to study techniques and compositions for producing radome materials which can be fabricated at temperatures considerably below their use temperature and yet maintain all desirable engineering properties. The high alumina bodies were evaluated that were fabricated with magnesium carbonate and magnesium fluoride as sources of magnesium oxide. Aluminum oxide-oxychloride was substituted for the alumina in a high alumina body which resulted in a very high density body. ...
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