ZrO_2/β-ZrWMoO_8可控热膨胀复合材料的制备  

Preparation of ZrO_2/β-ZrWMoO_8 composites with controllable thermal expansion

作　　者：杨娟[1] 刘芹芹[1] 程晓农[1] 孙秀娟[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2010年第6期670-673,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50372027);江苏省自然科学基金资助项目(BK2003404);江苏省高技术研究项目(BG2004026)

摘　　要：采用共沉淀法成功制备了纯度较高的各向同性的负热膨胀材料β-ZrWMoO8.将ZrO2与β-ZrWMoO8按一定比例机械混合,在1 020℃烧结2 h制备了热膨胀系数可控的ZrO2/β-ZrW-MoO8复合材料.以X射线衍射和扫描电子显微镜对所得材料结构及形貌进行表征,以热膨胀仪测定复合材料热膨胀系数.研究结果表明：在30~600℃温度区间内,所得ZrO2/β-ZrWMoO8复合材料的热膨胀系数皆线性一致,并且可以通过改变β-ZrWMoO8的质量分数,将复合材料的热膨胀系数控制为正、负或0.当β-ZrWMoO8的质量分数为50%时,复合材料的热膨胀系数接近0.β-ZrWMoO8 which exhibits excellent isotropic negative thermal expansion property was synthesized using co-precipitation method.The ZrO2/β-ZrWMoO8 composites with controllable thermal expansion coefficient were prepared by mixing ZrO2 and β-ZrWMoO8 at different mass ratios and sintered at 1 020 ℃ for 2 h.The structure and morphology of the resulting products were characterized by XRD and SEM.The thermal expansion coefficients of the composites were tested by thermo-mechanical analysis.Results reveal that all the thermal expansion properties of the ZrO2/β-ZrWMoO8 composites are linear for the temperature range from 30 to 600 ℃.The thermal expansion coefficient of the composites can be controlled as positive,negative or zero by adjusting the mass fraction of β-ZrWMoO8.The value can reach nearly zero when the mass fraction of β-ZrWMoO8 in the composite is 50%.

关 键 词：β-ZrWMoO8 ZRO2 复合材料 可控热膨胀 负热膨胀 

分 类 号：TB332[一般工业技术—材料科学与工程]