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Stability of Ceramics in Hydrogen between 4000 and 4500 FThe various reactions that are possible between hydrogen and certain ceramic materials are discussed as well as the means of measuring the extent of such reactions. Powdered carbides, nitrides, borides, and oxides were tested. These materials were heated inductively in a tungsten cup between 4000 and 4500 F for two 1-hour periods under a static hydrogen atmosphere. Weight, pressure, and diffraction pattern changes were observed, and these served to indicate the extent of reaction. Most of the ceramics, HfC, ZrC, TiC, TaC, NbC, WC, MO2C, HfN, ZrN, NbN, ZrB2, NbB2, and WB, showed less reaction than the minimum detectable value. However, the ceramics, TiN, TaN, HfB2, TiB2, ZrO2, and Cr2O3, apparently reacted to a measurable extent with hydrogen. Reactions of SiC, VC, and TaB2 with hydrogen were not determinable because of their incompatibility with the tungsten container.
Document ID
19980228142
Acquisition Source
Headquarters
Document Type
Other - NASA Memorandum (MEMO)
Authors
May, Charles E. (NASA Lewis Research Center Cleveland, OH United States)
Koneval, Donald (NASA Lewis Research Center Cleveland, OH United States)
Fryburg, George C. (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1959
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-MEMO-3-5-59E
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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