Krosakiharima Corporation

Masako Takenami

Keiichiro Akamine

Provided is a zirconia-mullite refractory raw material which is less likely to undergo alternation and microstructural degradation under high-temperature conditions, and low in thermal expansion rate, so as to have thermal shock resistance and corrosion resistance. The zirconia-mullite refractory raw material comprises crystalline zirconia and mullite as primary components, with the remainder being corundum and/or a matrix glass, wherein the crystalline zirconia includes a eutectic zirconia crystal having a grain size of 1.0 &#x3bc;m or less, and has a maximum grain size of 30 &#x3bc;m or less, and the matrix glass is contained in an amount of 5 mass % or less. The zirconia-mullite refractory raw material has a chemical composition comprising 30 to 55 mass % of ZrO, 30 to 55 mass % of AlOand 10 to 25 mass % of SiO, wherein each of the chemical components falls within a primary phase region of ZrOin an AlO&#x2014;ZrO&#x2014;SiOsystem phase diagram.

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Fukuoka, Japan

Masako Takenami