Abstract
Effects of 10 vol% Cr, Mo, W, Mn, Ni, Ti, BN, and ZrB2 on the grain growth of Al2O3, HfO2, MgO, and ZrO2 were investigated by vacuum heat‐treating previously vacuum hot‐pressed specimens containing a layer of the cermet and a layer of the corresponding oxide. Most of the metals and compounds inhibit grain growth of the four oxides investigated. Some of the additions enhance grain growth, whereas others react with the matrix oxide. In most systems, the oxide layer adjacent to the cermet showed exaggerated grain growth at the interface. No correlation was found between reactivity, melting point, and volatility of the metal addition and grain growth of the matrix oxide.
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