Tailoring the sealing properties of TiO2–CaO–SrO–B2O3–SiO2 glass-ceramic seals: Thermal properties, chemical compatibility and electrical property

Abstract In this paper, TiO 2 is added to CaO–SrO–B 2 O 3 –SiO 2 sealing system to tailor the sealing properties of glass-ceramic seals. The coefficient of thermal expansion (CTE) of quenched glasses and glass-ceramics (held at 750 °C for 100 h) does not change significantly with the addition of TiO 2 ; whereas, the glass stability (Δ T xg  =  T x  −  T g ) decreases systematically with increasing TiO 2 . The addition of TiO 2 accelerates the crystallization of sealing glasses. The formation of Sr-containing phase, e.g., Sr(TiO 3 ), contributes to the improved chemical compatibility as well as the increase in conductivity of sealing glasses ( e.g., from 7.9 × 10 − 8  S cm − 1 to 6.9 × 10 − 5  S cm − 1 at 800 °C). In addition, the good bonding is observed at the interface between Cr-containing interconnect (430SS) and glasses containing 4–8 mole % TiO 2 , held at 750 °C for 100 h.