【摘要】 采用传统固相工艺合成ZrW₂O₈-ZrSiO₄（体积比为1∶1）陶瓷复合材料,通过扫描电镜、和热机械分析仪分别对制备样品的断面形貌、物相组成和热膨胀性能进行表征.研究结果表明,复合材料的最佳烧结温度和时间为1 200℃和8 h,烧结过程中各组分之间没有发生化学反应,复合材料中仅含有原始组分ZrW₂O₈和ZrSiO₄2种物相,其在25³00℃的平均热膨胀系数为-0.77%10^-6K^-1.更多还原

【Abstract】 The Zr W₂O₈- ZrSiO₄ ceramic composites were successfully prepared by using the traditional solid- phase synthesis method in volume ratio of 1 ∶ 1. The specimens of fracture surface,phases and thermal expansion properties were characterized by way of scanning electron microscope（ SEM）,X- ray powder diffraction（ XRD） and thermal mechanical analysis（ TMA）,respectively. The results show that the optimum sintering temperature and sintering time of the composite material are 1 200 ℃ and 8 h,respectively. There is none chemical reaction taking place during the sintering process,and so the composite only contains ZrSiO₄ and ZrW₂O₈ phase. The average thermal expansion coefficient is- 0. 77 %10^-6K^-1 from 25 ℃ to 300 ℃.更多还原