THERMAL-EXPANSION OF FUSED QUARTZ POWDER COMPACTS

The fused quartz is one of the most typical materials of ion: thermal expansion. However, it was found that compacts prepared by isostatic c ompression of ground powder of fused quartz showed an anomalously high thermal expansion of 7 x 10(-6)/degrees C, i.e., about 10 times of th at of the normal fused quartz, The density of the glass powder increas ed with grinding time and with increasing pressure of compaction, Rele ase of the compaction strain by heating can be the reason of this high thermal expansion of the compacts of fused quartz powder.