Accession Number : AD0441239

Title :   THE STABILITY OF SELECTED OXIDES, NITRIDES AND BORIDES IN MOLYBDENUM TO 4000 F,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA

Personal Author(s) : White, J. E.

Report Date : 20 MAY 1964

Pagination or Media Count : 26

Abstract : Presented is an evaluation of the compatibility between molybdenum and several refractory compounds as dispersed phases in the 3000 to 4000 F temperature range. Compounds included in the study are BN, ZrN, HfN, LaB6, ZrO2 and ThO2. Hot-pressed alloys, consisting of nominally 2.5 vol % of the refractory phase in a molybdenum matrix, were vacuum annealed to evaluate temperature stability. Evaluation was based on changes in grain size, dispersed phase morphology, hardness and gross macroscopic deterioration. The materials HfN, ZrO2 and ThO2 showed potential for dispersion strengthening and were recommended for further development. (Author)

Descriptors :   (*MOLYBDENUM, COMPOSITE MATERIALS), (*COMPOSITE MATERIALS, REFRACTORY MATERIALS), STABILITY, HEAT, NITRIDES, BORON COMPOUNDS, BORIDES, LANTHANUM COMPOUNDS, DIOXIDES, ZIRCONIUM COMPOUNDS, THORIUM COMPOUNDS, HARDNESS, HOT WORKING, TANTALUM COMPOUNDS, OXIDES, YTTRIUM COMPOUNDS, MAGNESIUM COMPOUNDS, PARTICLE SIZE, POWDER METALLURGY, ELECTRIC FURNACES, VACUUM, METALLOGRAPHY, MICROSTRUCTURE, DISPERSION HARDENING.

Distribution Statement : APPROVED FOR PUBLIC RELEASE