含Y_2O_3的ZnO-Bi_2O_3-B_2O_3系统玻璃热学与电学性能研究

Thermal and Electrical Properties of ZnO-Bi_2O_3-B_2O_3 Glasses with Y_2O_3 Addition

用红外光谱仪、拉曼光谱仪和差热分析仪研究了用“熔化-急冷”制得的用于SOFC封装的含Y20a的ZnO—Bi20s—B20s系统玻璃的结构和转变温度（Tg）；用X射线衍射仪、热膨胀系数仪和高阻计研究了由“模压成型-热处理”制得的该玻璃制品的微晶化、热膨胀系数（a）和体积电阻率（P）情况。结果表明：Y2O3≤0．5-1．0wt．％时，Y2O3能促进[B03]向[BO4]转变，使a降低；Y20a≥0．5—1．0wt．％时，玻璃中Bi—O键增多，又使d降低趋势趋缓；随Y202增加，其作用可能由破坏网络结构逐渐向增强网络结构转变，致T5先降后升；添加Y120。延缓了玻璃的析晶；微晶化能提高d和P；添加2O33虽致仪和P下降，但其值仍在SOFC封接玻璃的要求范围内。

ZnO-Bi203-B203 glasses with Y203 addition for SOFC sealing were investigated. Structure and glass transition temperature （Tg） of the glasses prepared by ＂melting-quench＂ were studied by Infrared spectroscopy, Raman spectroscopy and differential thermal analyzer; crystallization, thermal expansion coefficient （co） and volume resistivity （p） of the glasses prepared by ＂molding-heat treatment＂ were studied by X-ray diffraction, dilatometer and high esistance meter. The results show： cx decreases significantly with the addition of Y203 〈 0.5-1.0wt.% to glasses for Y203 promotes [BO3] to [BO4] which strengthens the network; while Y203 /〉 0.5-1.0wt%, declines not so significantly for the increase of Bi-O content in the glasses; the effects of Y203 addition on the glasses may change from weakening the network to strengthening the network with the content of Y203 increasing, which leads to Tg decrease at first and then increase; Y203 addition on glasses can inhibit crystallization; crystallization can improve cc and p. Though adding Y203 to the glasses causes cc and pto decline, the value of cc and p are still within the sealing requirements of SOFC.