烧结条件对磷酸盐陶瓷Ca_(1-x)Ba_xZr_4(PO_4)_6热膨胀特性的影响

The effect of sinter conditions on low thermal expansion performance of a phosphate ceramic Ca_(1-x)Ba_xZr_4(PO_4)_6

将用共沉淀法合成的ＮＺＰ型二元固溶体Ｃａ１－ｘＢａｘＺｒ４（ＰＯ４）６（０≤ｘ≤１，简称ＣＢＺＰ）系列粉体分别添加ＺｎＯ和ＭｇＯ为烧结助剂，在８０ＭＰａ下干压成型，分别经１１００～１３００℃无压烧结３０～１２０ｍｉｎ，制成ＣＢＺＰ系列陶瓷材料，测定了２０～１０００℃的平均线膨胀系数，着重研究了烧结条件对该系列陶瓷热膨胀性能的影响。结果表明：不同烧结助剂对热膨胀系数的大小影响较大，以ＺｎＯ为添加剂的ＣＢＺＰ系列陶瓷为低热膨胀材料，而添加ＭｇＯ为助剂则会使该系列陶瓷的平均线膨胀系数明显升高，超出了低热膨胀的范围，原因是这两种添加剂促进致密化的机理不同所致。

The powders of a series of NZP family ceramics Ca1-xBaxZr4(PO4)6 (0≤x≤1,abbreviated CBZP)prepared by copreciptate method were compacted by cold pressing at 80MPa for 15min with the addition of ZnO or MgO as the sintering aid . The compacts were sintered at 1100℃ to 1300℃ for 30min to 120min, and then a series of ceramics CBZP were obtained . Their average coefficients of thermal expansion were tested from 20～1000℃, and the effect of sintering conditions on their thermal expansion property was investigated. The result showed that the additive primarily influenced their average coefficients of thermal expansion. This series ceramic addition with ZnO belongs to low thermal expansion ceramic. The increasing of their thermal expansion coefficients was because of forming the second phase.