LOW THERMAL EXPANSION CORDIERITE AGGREGATE AND ITS BONDED BODY

摘要

PURPOSE:To obtain cordierite aggregate and its bonded body having a low coefft. of thermal expansion in spite of the thick shape and excellent in thermal shock resistance. CONSTITUTION:Glass granules having a compsn. similar to that of cordierite, few defects and >=1mm diameter are crystallized to obtain the objective aggregate having 50mum average grain diameter. This aggregate and its bonded body exhibit hysteresis in the thermal expansion characteristics as the temp. is raised and dropped and the average coefft. of thermal expansion between room temp. and 1,000 deg.C is <=10X10-<7>/ deg.C.