Accession Number : AD0700976

Title :   DEVELOPMENT AND EVALUATION OF HOT ISOTATICALLY COMPACTED BORON nitride.

Descriptive Note : Triannual rept. no. 2, 30 May-30 Sep 69,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OHIO COLUMBUS LABS

Personal Author(s) : Brockway,M. C. ; Niesz,D. E.

Report Date : JAN 1970

Pagination or Media Count : 18

Abstract : Six commercial boron nitride powders were consolidated by hot isostatic compaction (HIC) into cylindrical test samples. Three conditions were employed for consolidation: 3000 F, 30,000 psi; 3600 F, 14,000 psi; and 4500 F, 15,000 psi. BN sample densities ranged up to 97.4 percent of theoretical. Maximum tensile strength (measured by diametral compression) reached 2700 psi. D-c electrical resistivity exhibits values in the 10 to the 14th power ohm/cm range and dielectric strength varied between 700 and 1200 volts/mil. Samples are now in preparation to obtain a-c electrical properties. (Author)

Descriptors :   (*NITRIDES, COMPACTING), (*BORON COMPOUNDS, COMPACTING), (*COMPACTING, *REFRACTORY MATERIALS), MICROSTRUCTURE, DENSITY, TENSILE PROPERTIES, ELECTRICAL PROPERTIES

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE