众所周知 ,无定形二氧化硅材料因其热膨胀系数低而具有十分优良的抗热震性能。但是在再加热过程中无定形二氧化硅的晶化会使其抗热震性能降低。有人对无定形二氧化硅的结晶行为作了专门研究。以熔融石英为原料制成 45ｍｍ× 45ｍｍ× 45ｍｍ的试样 ,在氧化性气氛电炉中 ,于 10 It is well known that amorphous silica materials have very good thermal shock resistance because of their low thermal expansion coefficient. However, the crystallization of amorphous silica during reheating reduces its thermal shock resistance. Someone made a special study on the crystallization behavior of amorphous silica. A sample of 45 mm × 45 mm × 45 mm was made from fused silica, and in an oxidizing atmosphere electric furnace,