Abstract: In recent years, high-precision and high-strength connections of complex parts have received widespread attention. This study employed amorphous phosphate adhesive as the base, incorporating fillers and curing agents including Si, B₄C, and ZrW₂O₈, to prepare a series of phosphate inorganic adhesives with varied coefficients of thermal expansion by adjusting the proportion. These adhesives were utilized for bonding β-lithium nesosilicate microcrystalline glass, effectively controlling its coefficient of thermal expansion. The bonded joints were thoroughly tested and characterized using techniques such as X-ray diffraction, Fourier transform infrared spectroscopy, simultaneous thermal analyzer, scanning electron microscopy, bonding strength testing, and coefficient of thermal expansion testing. The findings indicat that the phosphate adhesive modified with ZrW₂O₈ demonstrates outstanding performance in bonding β-lithium nesosilicate microcrystalline glass, with heat-treated bonded joints exhibiting a coefficient of thermal expansion of 0.12×10^-6 K^-1 over the temperature range of 20~100 ℃, and a maximum bonding strength of 6.5 MPa.

Key words: inorganic adhesive, coefficient of thermal expansion, bonding strength, β-lithium nesosilicate microcrystalline glass