Title

Ultra-High Temperature Oxidation of a Hafnium Carbide-Based Solid Solution Ceramic Composite

Abstract

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.

Department(s)

Materials Science and Engineering

Comments

This research was performed while the author (D.W.L.) held a National Research Council Associateship Award at the Air Force Research Laboratory, Edwards AFB, CA 93524 USA.

Keywords and Phrases

A. Ceramic; C. High temperature corrosion; C. Oxidation

International Standard Serial Number (ISSN)

0010-938X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Elsevier Ltd., All rights reserved.

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