采用化学共沉淀法合成前驱体,经1150℃烧结3.5 h得到近零膨胀26 wt%ZrW2O8/ZrO2复合陶瓷,并利用X射线衍射仪、扫描电镜和热膨胀仪研究了原料中加入Al(NO3)3·9H2O对26 wt%ZrW2O8/ZrO2复合陶瓷的相组成、致密度和热膨胀性能的影响.研究结果表明,少量添加Al(NO3)3·9H2O可有效提高复合材料致密度,所得复合陶瓷的组分仍为立方结构的α-ZrW2O8和单斜的m-ZrO2,其中添加2.21wt%Al(NO3)3·9H2O的复合材料的致密度达到理论密度的98.67%,且对复合陶瓷的热膨胀性能影响不大.其促进致密化机制为晶界处低熔点液相物质Al2(WO4)3提高了复合材料的烧结性能,消除气孔促进致密化.
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