本文通过XRD、SEM等分析,从显微结构方面研究了硼酸对熔融石英烧结及其晶化的影响.结果表明硼酸在本实验范围内促进烧结,而且当硼酸含量小于0.5wt%时,随硼酸含量的增加,效果越明显;当硼酸含量为0.5wt%至1.0wt%时,变化不大;当硼酸含量大于1.0wt%时,烧结的驱动力大大提高,促进烧结的效果也更加明显.研究还发现,添加硼酸同时也促进了熔融石英的晶化,而且随硼酸含量的增加,晶化越严重,其结晶度成指数增长.当硼酸含量小于1.0wt%时,结晶相为低温方石英相;当硼酸含量高于1.0wt%时,结晶相以低温方石英相为主,同时还生成新的结晶相(BSi)O_2和Si_(30.72)B_(1.28)O_(64).
This article has studied the influence of the boric acid on sintering and crystallization of the fused silica. The microstructure of the sintered fused silica was studied by XRD, SEM. The results showed that the sinter ability of the fused silica could be improved by the addition of boric acid. When the boric acid content is smaller than 0.5wt%,with the boric acid content's increase, the effect is obvious; When the boric acid content is between 0.5wt% and 1.0wt%, the sinterability of the fused silica changes little; When the boric acid content is greater than 1.0wt%, the effect is much more obvious. It was also found that adding boric acid promoted the crystallization of fused silica. As the boric acid content's increasing, the crystallization is more serious, and its crystalline grows at an exponential rate. When the boric acid content is not more than 1.0wt%, the crystalline phase is all the low-temperature cristobalite phase; when boric acid was higher than 1.0wt%, the crystalline phase is mainly low cristobalite, but it also contains a little other new phase" (BSi)O_2" and "Si_(30.72)B_(1.280O_(64)".
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