Bending strength and crack-healing behavior of Al2O3/SiC composites ceramics

✍ Scribed by Hae Sook Kim; Mi Kyung Kim; Sun Bae Kang; Seok Hwan Ahn; Ki Woo Nam

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 665 KB
• Volume: 483-484
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.09.169

✦ Synopsis

Five kinds of ceramics were used to evaluate the bending strength under three-point bending. The bending test was carried out at room temperature. The crack-healing behavior and the bending strength of the crack-healed specimens were investigated from room temperature to 1723 K. The bending strength of Al 2 O 3 /SiC composite ceramics is higher than that of Al 2 O 3 monolithic. Al 2 O 3 /SiC composite ceramics could completely heal semicircular cracks with diameters 100 m. The bending strength of Al 2 O 3 /SiC composite ceramics significantly increased after heat treatment at 1573 K for 1 h in air. The crack-healing ability of Al 2 O 3 /SiC composite ceramics was the best in additive powder 3 wt.% Y 2 O 3 .