GI-I 型粉浆涂塑铝瓷核冠材料线收缩率测试

A preliminary observation of the dimensional changes of GI-I dies and slip casting aluminous ceramic substrates during firing process

测试了ＧＩ－Ｉ型粉浆涂塑铝瓷核冠代型和铝瓷底层在不同烧烤时间、烧烤温度时的线收缩率。结果表明：代型和铝瓷底层在烧烤至１２０℃时，都有０．０２％的线膨胀；烧结烧烤完成后，代型的线收缩率为１３．２８％；铝瓷的线收缩率为０．２１％；代型的收缩主要发生在１２０～１１２０℃保持２ｈ的过程中，而铝瓷的收缩主要发生在１１２０℃保持２ｈ的过程中。

The dimensional changes of GI-I dies and slip casting aluminous ceramic substrates during firing process were measured. The die and aluminous ceramic substrates expanded with a linear expansion ratio of 0.02% when they were heated to 120℃. After sintering firing,GI-I die material gave a mean linear shrinkage of 13.28%,meanwhile,GI-I slip casting aluminous ceramic 0.21%.The dimensional changes of GI-I dies were mainly taking place during the 2h of firing procedure from 120℃ to 1120℃;and that of GI-I aluminous ceramics during the 2h of dwell time at 1120℃