采用分步加热固相法成功制备了纯度较高的各向同性负热膨胀材料ZrW2O8.将ZrW2O8与ZrO2按一定比例混合,在1200 ℃烧结24 h制备了热膨胀系数可控的ZrW2O8/ZrO2复合材料.研究结果表明,通过改变ZrW2O8的体积分数,ZrW2O8/ZrO2复合材料的热膨胀系数可以控制为负、正或零.当ZrW2O8的体积分数为37%时,复合材料的热膨胀系数接近零.为了得到致密的ZrW2O8/ZrO2复合陶瓷,采用Al2O3作为烧结剂,取得了较好的效果.0.35 wt% Al2O3的加入可以在不影响复合材料热膨胀性能的前提下,显著提高复合材料的致密度.
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