Glossite ceramics, kiln tool using the same, and method for producing globite ceramics

摘要

In this grossite ceramics, the value of IB/IA is 0.05 or less, IB/IA being the ratio of the integrated intensity IB of the peak at 2θ=30.07º which is the main peak originating from CaAl2O4 in X-ray diffraction with respect to the integrated intensity IA of the peak at 2θ=25.47º which is the main peak originating from CaAl4O7 in X-ray diffraction, and measured under an air atmosphere, the coefficient of thermal expansion from 27ºC to 300ºC is 2.0×10-6/K or less. In a thermomechanical analysis when this grossite ceramic is heated under an air atmosphere, it is preferred that, in a size versus temperature graph obtained, either a temperature region in which size decreases are observed or a plateau temperature region in which size does not substantially change is observed.