Agc Ceramics Co., Ltd.

Kenji Matano

Nobuo Tomura

To provide a high-zirconia electrocast refractory in which occurrence of cracks in manufacture and occurrence of cracks in use as a furnace material is further reduced while maintaining extremely high corrosion resistance to molten glass. The high-zirconia electrocast refractory contains 96.7 to 98.5 mass % of ZrO, 0.8 to 2.7 mass % of SiO, 0 to 0.2 mass % of NaO, 0.21 to 1 mass % of KO, 0.1 to 0.4 mass % of AlO, and does not substantially contain BO, in terms of oxide, as a chemical composition, wherein contents of the NaO and the KO satisfy a relation of following Formula (1)0.15 mass %&#x2264;C/2+C&#x2264;0.6 mass %&#x2003;&#x2003;(1)where Cis the content of KO and Cis the content of NaO, and each of the contents is expressed by mass % in the refractory.

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Takasago, Japan

Kenji Matano