絹雲母

長石系素地の性質

抄録

The sericite-feldspar bodies were fired at 1250°C and 1300°C, and porosity, linear shrinkage, true specific gravity, modulus of rupture, thermal expansion, translucency, and thermal conductivity of the fired bodies were determined.
The results obtained were as follows:
(1) The porosity of fired specimens was reduced to nearly zero, and the firing shrinkage was nearly equal in spite of the high content of sericite.
(2) The coefficient of thermal expansion decreased gradually with increasing the amount of sericite for feldspar when fired at 1250°C, while 1300°C fired bodies reduced the value rapidly as sericite contents are up to 10%, but the higher content of sericite it decrease gradually.
(3) The transverse strength of fired specimen increased in nearly proportion to the content of sericite.
(4) The value of true specific gravity became much higher with increase in sericite content.
(5) The translucency of the bodies decreased with increasing the content of sericite, although all bodies had much higher translucency than ordinary porcelain bodies.
(6) The thermal conductivity remained nearly equal up to 50 percent sericite, but with the higher content of sericite it decreased rapidly.