Effect of Na-feldspar and K-feldspar on the whiteness and other properties of porcelain bodies


ISSN 1121-7588
K. Dana, S. Kr. Das
Central Glass and Ceramic Research Institute, Kolkata, India

Abstract

Porcelain bodies containing kaolin, quartz, different kinds of K and Na feldspar and zircon opacifier were investigated to study their whiteness and other physico-mechanical properties when heated at 1160 to 1200°C. The standard colour measurement and three dimensional plot of L, a and b values has shown higher L value (more lightness in colour) and lower ranges of 'a' and 'b' values for Na-feldspar containing porcelain body. Interestingly it was observed that 'L' value increases with the increase in heating temperature in both the cases. Na-feldspar containing body achieves vitrification 20°C earlier than potash feldspar containing body and its flexural strength was higher than K-feldspar containing body due to its Young's modulus, higher bulk density and lower percent water absorption in the temperature range 1160-1200°C.
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