HIGH STATIC FATIGUE ALUMINA ISOPIPE

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PROBLEM TO BE SOLVED : To provide an isopipe which comprises a body having a configuration adapted for use in a fusion process. SOLUTION : The body comprises an alumina refractory which (i) comprises at least 90 vol.% of crystalline Al2O3, and (ii) comprises a glass phase, wherein the glass of the glass phase (a) comprises alumina and silica and on an oxide basis, the alumina and the silica constitutes at least 90 mol% of the glass, (b) on an oxide basis, the glass has an alkaline earth plus rare earth content that is greater than or equal to 2 mol%, and (c) on an oxide basis, the glass has an alkali content that is less than or equal to 5.5 mol%. The alumina refractory has a static fatigue in terms of time-to-failure of at least one hour when tested at 1, 200°C with an applied stress of 10, 000 psi (about 69 MPa). COPYRIGHT : (C)2012, JPO&INPIT