摘要
采用液相沉淀法合成了Si-Al-Ca-P-F-系超细玻璃粉体;分别在673、773、873、973、1 073和1 173 K温度下对粉体进行热处理,借助XRD、DSC、TEM、FT-IR等检测手段,研究了热处理温度对粉体的结晶状态、玻璃转变、析晶过程、微观形貌及结构的影响规律.结果表明,673 K时,中空近球状纳米粒子明显团聚并坍塌,温度低于773 K时,粉体仍保持原始的非晶态特征;873 K时,粒子粘连长大至亚微米级尺寸并出现明显的分相特征,玻璃态粉体析出CaF2晶相,随着温度的升高,Al2SiO5、Ca2SiO4及Ca3(PO4)2等晶相相继析出;热处理温度对粉体主要键连方式无明显影响,主体结构仍为[SiO4]、[AlO4]与[PO4]四面体以角顶相连的方式构成网络结构.
Glass powder of Si-Al-Ca-P-F^- system, which was heat-treated under 673,773,873,973,1 073 and 1 173 K respectively,was prepared by liquid precipitation method,Influence rules of heat-treatment on crystallized state, glass change and precipitation behavior, micromorphology, microstructure of the powder were researched by XRD, DSC, TEM, FT-IR and other test methods. The results show that the hollow nano powder reunites and collapses obviously at 673K,and it appeares the same amorphous as the raw powder at 773 K. The particles connect acutely and grow into submicron, and crystallized phases CaF2 come out firstly at 873 K as long as the temperature goes up. AI2SiO5, Ca2SiO4 and Ca3 （PO4 ）2 are separated sequentially. Heat-treatment temperature has no obvious effect on the main bonding structure linked by the tetrahedrons of [ SiO4 ], [ AlO4 ] and [ PO4 ] by means of angle connection.
出处
《广东工业大学学报》
CAS
2009年第2期40-42,共3页
Journal of Guangdong University of Technology
基金
广东省自然科学基金资助项目(020147)
广东省科技计划项目(2006B14701003)
