B_2O_3-TiO_2掺杂堇青石微晶玻璃制备及其晶化行为  

Preparation of B_2O_3-TiO_2 Doped Cordierite Glass-Ceramics and Its Crystallization Behavior

作　　者：曹颖[1] 印万忠[1] 王国胜[2] 徐昱峰[2] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]沈阳化工大学化学工程学院,辽宁沈阳110142

出　　处：《东北大学学报（自然科学版）》2012年第8期1171-1173,共3页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51074037)

摘　　要：按照堇青石化学计量配比,掺杂B2O3-TiO2,采用溶胶-凝胶法配合回流制备了以α-堇青石为主晶相的微晶玻璃.利用差热分析、X射线衍射、扫描电镜等测试手段,对该玻璃样品的晶化过程进行了试验观察,探讨了B2O3-TiO2在堇青石基微晶玻璃晶化过程中的作用.结果表明:样品在从无定形态到堇青石微晶玻璃的转变过程中,过渡相为镁铝尖晶石和β-石英固溶体,该结果说明B2O3起到了抑制μ-堇青石形成的作用.另外,TiO2作为形核剂,通过先在玻璃相中形成富钛小液滴来诱导非均匀成核,从而促进α-堇青石析晶.断面扫描电镜图像显示所得微晶玻璃为整体析晶.Using BzO3-TiO2 as an additive, cordierite glass-ceramics with stoichiometric composition were prepared by the sol-gel technique. The sample crystallization was characterized by differential thermal analysis, X-ray diffraction and scanning electron microscope. Effect of doping B2O3-TiO2 on crystallization was investigated. It is shown that a-cordierite is obtained from amorphous compound, with metastable phases of AI-Mg spinel and β-quartz solid solution produced,indicating that the B2O3 retards the crystallization of β-cordierite. The Ti-rich liquid drops inducing non-uniform nucleation are formed in the glass phase by doping TiO2, which promotes the bulk crystallization of a-cordierite.

关 键 词：堇青石 微晶玻璃 溶胶-凝胶 B2O3TiO2 晶化 

分 类 号：TQ171[化学工程—玻璃工业]