Accession Number : AD0257063

Title :   STABILITY OF REFRACTORY COMPOUNDS IN HYDROGEN BETWEEN 4500 AND 5000 F. AND THEIR COMPATIBILITY WITH TUNGSTEN

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON D C

Personal Author(s) : MAY,CHARLES E. ; HOEKSTRA,PAUL D.

Report Date : MAY 1961

Pagination or Media Count : 1

Abstract : The present work is a continuation of work described in NASA Memorandum 3-5-59E (AD-213 048). Each refractory compound was placed in a W cup which was inductively heated in a H atmosphere to temperatures between 4500 and 5000 F. Changes in pressure, weight, and crystal structure were taken as indications of reaction. HfC, TaC, TiC, ZrC, HfN, TiN, ZrN, and ZrO2 showed weight loss due to volatilization, decomposition, or reaction with H; reaction of TaN was indicated from diffraction data. Any reaction occurring for TaB2, WB, and NbC was less than the minimum detectable amount. Most of the compounds (except the nitrides) were found to be incompatible with the W container. This prevented the determination of the degree of stability of some of the materials in H. These results are compared with the earlier work at Lewis Research Center on the stability of these materials in H between 4000 and 4500 F. (Author)

Descriptors :   *BORIDES, *CARBIDES, *NITRIDES, *REFRACTORY MATERIALS, CONTAINERS, DECOMPOSITION, DIOXIDES, HAFNIUM COMPOUNDS, HIGH TEMPERATURE, HYDROGEN, MOLYBDENUM COMPOUNDS, NIOBIUM COMPOUNDS, OXIDES, POWDER ALLOYS, POWDER METALS, STABILITY, TANTALUM COMPOUNDS, TITANIUM COMPOUNDS, TUNGSTEN, TUNGSTEN COMPOUNDS, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE