Low thermal expansion cordierite aggregate and its bonded body

摘要

A low thermal expansion cordierite aggregate, which consists mainly of cordierite crystals having a mean crystal diameter of at least 50 mu m and has little orientation in the crystal structure, shows hysteresis in its thermal expansion property accompanying a rise and fall of the temperature, and has a mean thermal expansion coefficient within a temperature range of from room temperature to 1000 DEG C. of at most 10x10-7/ DEG C.