クリストバライトの生成がアルミナ強化磁器の強度に及ぼす影響

概要

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Effect of addition of fine-grained quartz powders on the bending strength of alumina strengthened porcelain bodies was investigated. By lowering the content of feldspar, sub-micron particles of quartz dissolved into feldspatic liquid phase and transformed into cristobalite at 1300℃. Bulk density of porcelain body decreased with the decrease in alumina content, together with an increase in cristobalite content. Bending strength of porcelain increased with lower content of feldspar, and a value, 250 MPa was achieved in the case of the porcelain bodies having 10% of feldspar and 10 to 20% of alumina. Important factors for strengthening porcelain were to reduce the content of coarse particles and to increase the total content of crystalline phases, such as alumina, mullite and cristobalite.
2003-02-01