Ultra-High Temperature Oxidation of a Hafnium Carbide-Based Solid Solution Ceramic Composite
Hafnium carbide-based solid solution ceramics with yttria additions were consolidated via hot pressing utilizing chromium carbide as a transient liquid sintering agent. Selected samples were oxidized at temperatures exceeding 2200. °C under high velocity airflow to determine their potential for service in ultra-high temperature environments. Cross-sectional examination revealed a complex multi-layer scale comprising a highly porous exterior region, a dense multi-phase interior region, and an oxygen- and carbon-containing interlayer consisting of nanocrystalline graphite in an amorphous or nanocrystalline oxide matrix. Outward diffusion of mobile cations is speculated to play an important role in establishing the observed scale morphology.
D. W. Lipke et al., "Ultra-High Temperature Oxidation of a Hafnium Carbide-Based Solid Solution Ceramic Composite," Corrosion Science, vol. 80, pp. 402-407, Elsevier Ltd., Mar 2014.
The definitive version is available at https://doi.org/10.1016/j.corsci.2013.11.049
Materials Science and Engineering
Keywords and Phrases
A. Ceramic; C. High temperature corrosion; C. Oxidation
International Standard Serial Number (ISSN)
Article - Journal
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