纳米级SnO2或Yb2O3对熔融石英陶瓷析晶性能的影响

通过XRD分析和热膨胀率实验,从析晶角度探讨了添加纳米级SnO₂或Yb₂O₃对熔融石英陶瓷析晶性能的影响。结果表明:熔融石英陶瓷高温析晶的主要晶化产物为方石英,方石英析出量随烧结温度的提高而逐渐增多;纳米级SnO₂或Yb₂O₃的引入可通过抑制熔融石英中方石英的析出,有效地降低熔融石英材料在升温过程中的热膨胀率,并且随着烧结温度升高需要不断调整添加剂用量,纳米级SnO₂和Yb₂O₃的最佳用量(质量分数)分别为1%和2%。

Effect of Nano-SnO2 or Nano-Yb2O3 on Crystallization Property of Fused Quartz Ceramics

Effects of nano-SnO₂ or nano-Yb₂O₃ on crystallization property of fused quartz ceramics were studied by XRD and measurement of thermal expansion rate from the perspective of crystallization. The results indicate that cristobalite as the main crystal phase would crystallized in the fused quartz glass at high temperature, and the amount of cristobalite increases with increasing of sintering temperature; the addition of nano-SnO₂ or nano-Yb₂O₃ effectively decreases the expansion ratio of the fused quartz ceramic materials during temperature elevating process by inhibiting crystallization of cristobalite, and with increase of sintering temperature, the dosage of additive necessary to keep the fused quartz ceramic materials with a low expansion ratio was adjusted, the optimum dosage (mass fraction) of nano-SnO₂ or nano-Yb₂O₃ as crystallization inhibitors is 1% and 2%, respectively.