Joining of AlON ceramics by using β-SiAlON/Y-Si-Al-O-N glass-ceramic as interlayer

By formation β-SiAlON/Y-Si-Al-O-N glass-ceramic as interlayer, AlON ceramics (51.70 at.% O) were successfully joined at 1475 °C for 15 min. The effects of joining temperature on wettability of interlayer material on AlON ceramics, phase assemblages and microstructures of joints, and bending strength of the as-joined AlON ceramics were investigated. The wettability of the interlayer material on the AlON ceramics is positively correlated with joining temperature at 1300–1475 °C, and the minimum contact angle of 8° was measured at 1475 °C. Increasing joining temperature is helpful to improve the bonding strength, and the maximum bending strength of 125 MPa was achieved for the samples joined at 1475 °C, which is ~41.7% of AlON strength. The high bonding strength should be mainly attributed to the formation of high strength β-SiAlON crystalline in Y-Si-Al-O-N glasses and strong interface between AlON substrate and interlayer led by the excellent wettability of β-SiAlON/Y-Si-Al-O-N glass-ceramic on AlON ceramics.