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

By formation beta-SiMON/Y-Si-Al-O-N glass-ceramic as interlayer, AlON ceramics (51.70 at.% O) were successfully joined at 1475 degrees 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 degrees C, and the minimum contact angle of 8 degrees was measured at 1475 degrees 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 degrees C, which is similar to 41.7% of AlON strength. The high bonding strength should be mainly attributed to the formation of high strength beta-SiAlON crystalline in Y-Si-Al-O-N glasses and strong interface between AlON substrate and interlayer led by the excellent wettability of beta-SiAlON/Y-Si-Al-O-N glass-ceramic on AlON ceramics.