Enhancement of Sinter Densification of SrO-BaO-Nb_2O_5-SiO_2 Tungsten-Bronze Glass-Ceramics by Doping with P_2O_5  

作　　者：J.C.Chen Y.Zhang 

机构地区：[1]Shenyang Research and Development Centre for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences [2]State Key Laboratory of New Ceramics and Fine Processing,Institute of Nuclear and New Energy Technology,Tsinghua University

出　　处：《Journal of Materials Science & Technology》2013年第8期731-736,共6页材料科学技术（英文版）

基　　金：Financial supports from the National Natural Science Foundation of China(No.50902082);the State Key Laboratory of Electrical Insulation and Power Equipment (EIPEl 1208)

摘　　要：Densification behaviors of SrO-BaO-Nb2O5-SiO2 based glass-ceramics prepared by conventional sintering were investigated with an emphasis on the influence of P2O5 content. Although P2O5 dopant did not modify the surface crystallization mechanism, it resulted in a decrease of the glass transition temperature, which facilitates the viscous glass flow necessary for sintering. However, premature crystallization of （Sr, Ba）Nb2O6 induced by addition of excess amount of P2O5 essentially retarded sintering due to the formation of closed pores in the matrix. The SrO-BaO-Nb2O5-SiO2 glass with 1.0 mol% P2O5 （SBN-1P） showed the best sinter densification, which was accomplished at about 850 ℃.Densification behaviors of SrO-BaO-Nb2O5-SiO2 based glass-ceramics prepared by conventional sintering were investigated with an emphasis on the influence of P2O5 content. Although P2O5 dopant did not modify the surface crystallization mechanism, it resulted in a decrease of the glass transition temperature, which facilitates the viscous glass flow necessary for sintering. However, premature crystallization of （Sr, Ba）Nb2O6 induced by addition of excess amount of P2O5 essentially retarded sintering due to the formation of closed pores in the matrix. The SrO-BaO-Nb2O5-SiO2 glass with 1.0 mol% P2O5 （SBN-1P） showed the best sinter densification, which was accomplished at about 850 ℃.

关 键 词：Sintering densification DieLectric properties GLASS-CERAMIC 

分 类 号：TQ174.1[化学工程—陶瓷工业]