共沉淀法制备负膨胀系数材料ZrW_2O_8  

Synthesis of negative thermal expansion material ZrW_2O_8 through co-precipitation method

作　　者：杜学丽[1,2] 曲选辉[1] 秦明礼[1] 郭瑞松[3] 

机构地区：[1]北京科技大学材料科学与工程学院,新金属材料国家重点实验室 [2]天津理工大学材料科学与工程学院,天津300191 [3]天津大学材料科学与工程学院

出　　处：《北京科技大学学报》2007年第9期925-927,共3页Journal of University of Science and Technology Beijing

基　　金：北京市先进粉末冶金材料与技术重点实验室开放课题基金资助项目(No.20050427690)

摘　　要：以H2WO4和ZrOCl2.8H2O为原料,先采用共沉淀法制备出前驱物,再加热合成出了ZrW2O8粉末.用X射线衍射(XRD)对合成粉末进行物相分析,用扫描电子显微镜(SEM)分析粉末形貌,用差热-热重分析确定合成温度.结果表明:溶液pH值控制在2～3范围内,溶液中Zr4+和WO42-能同时发生沉淀;所得前驱物在1200℃反应1h,所得产物相主要为ZrW2O8,其粒度在100nm左右,且分布均匀.ZrW2O8 was economically synthesized from ZrOC12·8H2O and H2WO4 through co-precipitation route. The phases of the synthesized powders were analyzed by X-ray diffraction （XRD）, the morphology was observed by scanning electron microscopy （SEM）, and the synthesized temperature was determined by differential thermal gravimetric analysis. The result reveals that the suitable pH value of co-precipitation of Zr^4＋ and WO^2-4 was 2 - 3. After the precursor was heated at 1200 ℃ for 1 h, the main phase of the synthesized powders was ZrW2O8. The particle size of ZrW2O8 powders wad about 100 nm and distributed homogeneously.

关 键 词：陶瓷 钨酸锆 负热膨胀 共沉淀 各向同性 

分 类 号：TQ174[化学工程—陶瓷工业]