Structure, thermal behavior, and chemical durability of Y 2 O 3 /Sb 2 O 3 ‐modified phosphate glass for Cu/Al substrates

Abstract Due to the inherent material limitations of Cu/Al substrates—particularly their low melting point (approximately 660°C for Al) and high coefficient of thermal expansion (CTE)—these materials pose significant challenges in sealing processes. To address these challenges, this study focuses on developing a tailored low‐temperature, high‐CTE phosphate sealing glass. The structural influence of Y 2 O 3 substitution for Sb 2 O 3 in phosphate glasses was comprehensively investigated using Fourier‐transform infrared spectroscopy (FTIR), Raman spectroscopy, and nuclear magnetic resonance (NMR). The corresponding thermal properties and chemical durability of the glasses were also evaluated. The aim is to develop glasses with a high CTE (>14 × 10 −6 °C −1 ), low sealing temperature (<600°C), and enhance chemical durability, thereby enabling highly reliable sealing of Cu/Al substrates.