Fused mullite, pure and with 10 to 25 vol% ZrO 2 added, was milled in an attritor and sintered in air at temperatures near 1600°C to a dense fine‐grained ceramic. The ZrO 2 promoted densification and retarded grain growth of the mullite phase. Transmission electron microscopy showed that compositions containing ZrO 2 were substantially free of glass, whereas pure mullite bodies contained a glassy phase. The ZrO 2 formed inter granular, isolated particles .
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Prochazaka et al. (1983) studied this question.
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