Effects of B2O3 content on crystallization behavior and properties of low temperature co-fired CaO-B2O3-SiO2 glass-ceramics

B2O3-containing MgO-Al2O3-SiO2-Li2O glass-ceramics were fabricated via crystallization treatment of primal glasses for the purpose of joining Si3N4 ceramics. The effects of B2O3 content on the crystallization behavior, coefficient of thermal expansion and softening temperature of MgO-Al2O3-SiO2-Li2O-B2O3 glasses were investigated. The results reveal that the glass transition temperature and the crystallization temperature of the glasses decrease with the increasing B2O3 content. It also demonstrates that gamma-spodumene solid solution is detected in the glass-ceramics after heat treatment at 735 degrees C and 840 degrees C, respectively, whereas the heat treatment at 1000 degrees C results in the precipitation of beta/gamma-spodumene coexisting phases solid solution and forsterite. Additionally, by controlling the composition and crystallization treatment, the CTEs of glass-ceramics can be matched with the Si3N4. Furthermore, contact angle measurement confirms that the glass-ceramics possess a good wettability on the Si3N4 substrate, which can be considered as the candidate materials for joining Si3N4 ceramics.