Accession Number : AD0475444

Title :   BEO CERAMICS FOR MICROWAVE APPLICATIONS.

Descriptive Note : Quarterly rept. no. 2, 10 Jul-10 Oct 65,

Corporate Author : BRUSH BERYLLIUM CO ELMORE OH

Personal Author(s) : Holladay, Curtis O. ; Lynch, John F. ; Brown, Raymond J.

Report Date : NOV 1965

Pagination or Media Count : 28

Abstract : The immediate purpose of this work has been to develop defense, low loss BeO-TiO2 bodies. Several techniques were utilized to either prevent the intrinsic reduction of TiO2 at the sintering temperature, or to neutralize this reduction effect. The techniques were as follows: preparation of thin specimens which would allow oxygen diffusion throughout; sintering under one atmosphere of oxygen pressure; hot pressing at 1350 C; firing in a fluorine atmosphere; and doping with UO3. Success was not achieved with any of these techniques. Highly sintered bodies invariably exhibited high dissipation factors of the order of magnitude of 0.01; these bodies possessed the characteristic dark bluish-gray interiors which were semiconducting, with d-c resistance of 1,000-100,000 ohms. (Author)

Descriptors :   *MICROWAVE EQUIPMENT), (*CERAMIC MATERIALS, BERYLLIUM COMPOUNDS, OXIDES, THERMAL CONDUCTIVITY, PREPARATION, DOPING, SEMICONDUCTORS, TITANIUM COMPOUNDS, DIOXIDES, DIELECTRIC PROPERTIES, ANNEALING, PROCESSING, OXYGEN, FLUORINE, CONTROLLED ATMOSPHERES, SINTERING, QUENCHING, ELECTRICAL PROPERTIES, URANIUM COMPOUNDS.

Subject Categories : Electrical and Electronic Equipment
      Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE