Microstructural Development of Calcium alpha-SiAlON Ceramics with Elongated Grains |
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| Authors: | Chris A Wood Hong Zhao Yi-Bing Cheng |
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| Affiliation: | Department of Materials Engineering, Monash University, Melbourne, Victoria 3168, Australia |
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| Abstract: | Silicon nitride (Si3N4) and SiAlONs can be self-toughened through the growth of elongated β-Si3N4/β-SiAlON grains in sintering. α-SiAlONs usually retain an equiaxed grain morphology and have a higher hardness but lower toughness than β-SiAlONs. The present work has demonstrated that elongated alpha-SiAlON grains can also be developed through pressureless sintering. alpha-SiAlONs with high-aspect-ratio grains in the calcium SiAlON system have exhibited significant grain debonding and pull-out effects during fracture, which offers promise for in-situ -toughened α-SiAlON ceramics. |
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