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CZP陶瓷的烧结特性与抗热冲击性能

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Abstract:

采用固相合成法制备CaZr4(PO4)6(calciumzirconiumphosphate,CZP)陶瓷粉体。研究添加剂对CZP陶瓷烧结特性和热膨胀系数的影响以及CZP陶瓷的抗热冲击性能。通过X射线衍射分析、扫描电镜分析、热膨胀法和Archimedes排水法分别表征CZP陶瓷的晶体结构、微观形貌、热膨胀系数和体积密度。结果表明CZP陶瓷的最佳烧结温度为1100℃,此时添加质量为2%MgO或ZnO的CZP陶瓷的显气孔率最低,分别为0.38%或0.23%;在室温(25℃)~600℃、热震40次后,CZP陶瓷的抗弯强度仅下降2.66%;随着烧结温度的提高(1100~1250℃),CZP陶瓷的平均线热膨胀系数由正值(2.14×10–6℃–1)变化为负值(–1.98×10–6℃–1)。

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