中文摘要：

可控热膨胀材料可用于高精密光学系统、电子器件和布拉格光栅的温度补偿等。由于ZrWMoO8具有线性一致的NTE特性,本工作以硝酸氧锆（ZrO（NO3）2.5H2O）、钨酸铵（H40N10O41W12.xH2O）和钼酸铵（N6H24Mo7O24.4H2O）为原料,采用湿化学法成功合成出热膨胀系数可控的ZrWMoO8陶瓷复合材料。采用热重-差示扫描量热分析（TG-DSC）分析了前驱体的晶化过程;通过X射线衍射仪（XRD）、扫描电镜（SEM）、能谱仪（EDS）和热膨胀仪对合成样品的晶体结构、断面形貌和热膨胀性能进行表征。研究结果表明,合成所得复合材料的成分均为ZrO2和β-ZrWMoO8,热膨胀系数在30～600℃温度区间内均线性一致,并且随着β-ZrWMoO8的质量分数的增大,复合材料的热膨胀系数逐渐降低,其中ZrO2/50%ZrWMoO8复合材料的热膨胀系数为-0.61×10-6K-1,近似为0。

英文摘要：

These controlled expansion composites can be used in high precision optical mirrors,fiber optic systems,electronic devices or as a thermal package for fiber Bragg gratings.A serious of β-ZrWMoO8 ceramic composites with controllable thermal expansion were successfully synthesized by wet chemical method using zirconium nitrate（ZrO（NO3）2·5H2O）,ammonium tungstate（H40N10O41W12·xH2O）and ammonium molybdenum（N6H24Mo7O24·4H2O）as raw materials.The crystallization process of the precursor was studied by the thermogravimetric and differential scanning calorimetry（TG-DSC）.The crystal structure,section morphology and thermal expansion property were investigated by X-ray diffraction（XRD）,scanning electronic microscopy（SEM）and dilatometry,respectively.The results indicate that the composition of all of the obtained composites is ZrO2 and β-ZrWMoO8,and these composites exhibit linear thermal expansion property during the temperature range from 30 to 600℃.The average thermal expansion coefficient of ZrO2/β-ZrWMoO8 composites will decrease with increasing mass fraction of β-ZrWMoO8.Among all the samples,the ZrO2/50%ZrWMoO8 composite with an average thermal expansion coefficient of-0.61×10-6K-1 shows almost zero thermal expansion property.