Abstract

Strontium aluminosilicate glass-ceramics modified with zirconia additions in the presence of yttria as a stabilizing oxide and without it have been prepared by a sol–gel process. Increasing the zirconia content from 5 to 15 wt % has been shown to reduce the gelation time of the starting solutions, lower the gel crystallization onset temperature, activate the glass-ceramic sintering process, and increase the critical stress intensity factor (K_Ic) of the glass-ceramics by more than a factor of 2. The present results confirm that the increase in K_Ic on the addition of ZrO₂ is due to transformation toughening. At the same time, the addition of yttria as a stabilizing oxide has been shown to hinder the martensitic transformation of tetragonal ZrO₂ into the monoclinic phase.

中文翻译：

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氧化锆改性硅铝酸盐玻璃陶瓷的合成，结构与性能

摘要

在氧化钇存在下以稳定氧化物的形式添加氧化锆改性的铝硅酸锶玻璃陶瓷已经通过溶胶-凝胶法制备。已表明将氧化锆含量从5 wt％增加到15 wt％可以减少起始溶液的胶凝时间，降低凝胶的结晶起始温度，激活玻璃陶瓷烧结过程，并增加临界应力强度因子（K _Ic）。玻璃陶瓷的2倍以上。目前的结果证实，添加ZrO _2后K _Ic的增加是由于转变增韧。同时，已显示氧化钇作为稳定氧化物的添加阻碍了四方ZrO ₂的马氏体转变为单斜晶相。