Bending Strength and Microstructure of Commercial Porcelains for Tablewares

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  • 市販食器用磁器の曲げ強度と微構造
  • シハン ショクキヨウ ジキ ノ マゲ キョウド ト ビ コウゾウ

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Abstract

The bending strength of commercial porcelains for tablewares from ten makers in Tono district, Gifiprefecture was investigated by using test bars of the same size, non-glazed or glazed and fired in respective makers. An unglazed porcelain body which showed the maximum mean bending strength of 8.9kg/mm2 had a maximum relative density of 97.5% with pore size less than 20μm. The bending strength of unglazed bodies was in the range from 4.9 to 8.9kg/mm2 and was increased to the range from 7.0 to 12.0kg/mm2 by glazing. In general, when the compressive stress in glaze was over 2.0kg/mm2, fracture occurred from the origin in the bodies and the glazing increased the bending strength of porcelain bodies by about 3.5kg/mm2. Especially, pores at the boundaries between glaze and body generated during firing acted as fracture origins and reduced the bending strength.

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