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中文摘要：
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24h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。0．35wt％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。
英文摘要：
ZrW2O8 which exhibits excellent isotropic negative thermal expansion was synthesized using the step by step solid state reaction. The ZrW2O8/ZrO2 composites with controllable thermal expansion coefficient were prepared by mixing ZrW2O8 and ZrO2 at different volume ratios and sintered at 1200℃ for 24 h. The thermal expansion coefficient of ZrW2O8/ZrO2 composites can be controlled, being negative, positive or even zero, by adjusting the volume fraction of ZrW2O8. The ZrW2O8/ZrO2 composites show almost zero thermal expansion when the volume fraction of ZrW2O8 is 37%. In order to obtain dense and tough ZrW2O8/ZrO2 ceramic, AlzO3 was adopted as an additive. The results reveal that it is effective to improve the density of the composites. 0.35 wt% Al2O3 additive can increase the density of the composites rapidly with slight effects on the thermal expansion property.
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