超细硼化锆粉体制备过程中的影响因素探究  

Influencing Factors of Preparation of Ultra-fine Zirconium Diboride Powders

作　　者：王亚飞[1] 段云彪[1] 王开军[1] 张维钧[1] 傅强[1] 胡劲[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《硅酸盐通报》2017年第2期545-549,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(U1037601)

摘　　要：探究了溶胶-凝胶协同碳热还原反应制备超细ZrB_2粉体中Zr^(4+)与柠檬酸的配比r、溶胶-凝胶温度T、体系pH值和分散剂含量c对ZrB_2前驱体及热解产物的影响。并采用X射线衍射仪、红外光谱仪、激光粒度仪、场发射扫描电镜和透射电镜对ZrB_2前驱体及热解产物进行表征和分析。结果表明:r=2,pH=4为柠檬酸和Zr^(4+)发生络合反应的最佳条件;当T=50℃时,产物基本为球形或类球形,且粒度分布均匀;聚乙二醇除分散作用外,还能够对溶胶中团簇的交联起到"导向"作用,使热解后的晶粒排列有序,当c=2%时,可获得分散性好、尺寸均匀的产物。Depending on the basic principle of carbothermal reduction,Ultra-fine zirconium diboride powders could be synthesized. In this study,the influence of the molar ratio of Zr^（4＋）to citric acid,sol-gel temperature,the value of pH and content of dispersant on amorphous precursor of zirconium diboride and the synthesized powders were investigated. X-ray diffraction（ XRD）,infrared spectroscopy（ IR）,laser particle size analyzer,field emission scanning electron microscope（ FESEM） and transmission electron microscope（ TEM） were used to characterize amorphous precursor zirconium diboride and synthesized powders. It was discovered that,the optimum condition of complexation is Zr^（4＋）/ citric acid molar ratio of 2and the pH value of 4; when sol-gel temperature is 50 ℃,the synthesized powders exhibited nearspherical morphology. Besides the disperse function,polyethylene glycol can also guide sol particles to reunite,this can result in the ordered arrangement of crystal particles by pyrolysis and the synthesized powders which have good homogeneity and dispersity,especially with polyethylene glycol content of 2%.

关 键 词：溶胶-凝胶 碳热还原 前驱体 硼化锆 

分 类 号：TQ174.75[化学工程—陶瓷工业]