硅酸锶粉体的溶胶-凝胶制备工艺及机理  

Preparation Process and Mechanism of Sr_2SiO_4 Powder by Sol-gel Method

作　　者：曾晓蕾[1] 欧阳家虎[1] 李玉峰[1] 钟继勇[1] 

机构地区：[1]哈尔滨工业大学特种陶瓷研究所,哈尔滨150001

出　　处：《人工晶体学报》2009年第S1期5-8,共4页Journal of Synthetic Crystals

基　　金：国家自然科学基金面上项目(50572020);国家高技术863项目(2006AA03Z537);教育部新世纪优秀人才计划(NCET-06-0339)

摘　　要：以正硅酸乙酯(TEOS)和Sr(NO3)2为原料,采用溶胶-凝胶法制备出高纯度的不规则形状硅酸锶粉体。利用X射线衍射仪、扫描电镜和差热-热重分析仪等研究了锶盐种类、水硅比和pH值对硅酸锶粉体的相结构、形貌和纯度的影响,探讨了溶胶-凝胶法制备硅酸锶粉体的反应过程与机理。结果表明:溶胶-凝胶法制备Sr2S iO4粉体的最佳工艺条件为:锶盐选择Sr(NO3)2,n(H2O)∶n(TEOS)∶n(EtOH)为24∶1∶5,pH值为3~4,煅烧温度为800℃。与传统高温固相反应法相比,该方法大幅度降低了煅烧温度,提高了粉体的纯度,同时能够减小最终获得的硅酸锶粉体粒径。Irregular strontium silicate powders with high purity were synthesized by sol-gel process using TEOS and Sr(NO3)2 as raw materials.The effects of strontium salt types(SrCl2,SrCO3 and Sr(NO3)2),the ratio of water to TEOS and pH value on structure,morphology and purity of strontium silicate powders were investigated by X-ray diffractometer(XRD),scanning electron microscope(SEM) and differential scanning calorimetry-thermogravimetry(DSC-TG).At the same time,the mechanism for synthesis of Sr2SiO4 powder was also studied.The processing parameters of sol-gel process to produce Sr2SiO4 were optimized to be Sr(NO3)2 salt,the n(H2O)∶n(TEOS)∶n(EtOH) as 24∶1∶5,pH value of 3-4 and calcining temperature of 800 ℃.Contrasted with traditional high-temperature solid-state reaction method,the sol-gel process reduced greatly the calcination temperature and the particle size,and also enhanced the purity of Sr2SiO4 powder.

关 键 词：硅酸锶 溶胶-凝胶法 制备工艺 反应机理 

分 类 号：TB383.3[一般工业技术—材料科学与工程]