LUO Linghong, LIU Liangguang, WANG Leying, CHEN Liang, XU Xu, WU Yefan
(Jingdezhen Ceramic Institute, Jiangxi Provincial Key Laboratory of Fuel Cell Material and Devices,
Jingdezhen 333000, Jiangxi, China)

Abstract: The CaO-BaO-SiO₂-B₂O₃ (CBSB) sealing glass with adding different additives such as no additives, TiO₂ and ZrO₂ as additives and TiO₂ and ZrO₂ composite additives, was obtained using the method of melting annealing, which marked respectively as CBSB0、CBSB1、CBSB2、CBSB3. The effects of different additives on the crystal temperature and crystal diffraction intensity of the glass were characterized by differential thermal analysis and XRD, respectively. The morphology of crystal was observed by SEM and the changes of mechanical properties before and after glass crystallization were investigated using flexural strength. The experimental results showed that 2.8% additive exist in the CBSB glass network structure in the form of [TiO₄] and [ZrO₄] tetrahedron which promote the crystallization temperature of glass to move to high temperature, and CBSB3 possess the highest crystallization temperature among four glasses, whose value is 868 °C. The XRD result indicated that the additive inhibited the formation of BaAl₂Si₂O₈ and Ba₂Ca (B₃O₆)₂ to a certain extent. Moreover, the addition of TiO₂ had the most obvious inhibitory effect. It also can be seen from the combination of SEM and flexural strength that the flaky crystals are precipitated in the glass which increase the bending strength comparing with that of the corresponding base glass, and CBSB2 has the highest bending strength at heat-treatment of 850 °C, whose value is 125.26 MPa.

Key words: glass-ceramics; additive; crystallization temperature; rupture strength