Crystallization behavior and thermal properties of B₂O₃–containing MgO-Al₂O₃-SiO₂-Li₂O glass-ceramic and its wettability on Si₃N₄ ceramic

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 γ-spodumene solid solution is detected in the glass-ceramics after heat treatment at 735 °C and 840 °C, respectively, whereas the heat treatment at 1000 °C results in the precipitation of β/γ-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.