Fused cast products based on alumina-zirconia-silica with an improved microstructure
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United States of America Patent
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Jun 10, 2003
Grant Date -
Sep 6, 2001
app pub date -
Jan 30, 2001
filing date -
Jan 31, 2000
priority date (Note) -
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Abstract
Oxidized alumina-zirconia-silica (AZS) refractories containing 40 wt % to 55 wt % Al.sub.2 O.sub.3, 32 wt % to 45 wt % ZrO.sub.2, 10 wt % to less than 16 wt % SiO.sub.2 and 1 wt % to 3 wt % of an alkali metal oxide selected from Na.sub.2 O, K.sub.2 O and mixtures thereof have a microstructure essentially comprising alpha-alumina crystals, free zirconia crystals, eutectic crystals and an intercrystalline vitreous phase. At least in an active area, more than 20% by number of the free zirconia crystals have a dendritic shape and are interleaved with each other and with eutectic crystals and at least 40% by number of the dendritic free zirconia crystals have a dimension greater than 300 .mu.m.
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