Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10155512 | Journal of the European Ceramic Society | 2018 | 5 Pages |
Abstract
Ta0.8Hf0.2C-27âvol%SiC (99.0% in relative density) composite was toughened and strengthened via pressurelessly in-situ reactive sintering process. HfC and β-SiC particles were formed after reaction of HfSi2 and carbon black at 1650â°C. Ta0.8Hf0.2C was obtained from solid solutioning of HfC and commercial TaC. The β-α phase transformation of SiC proceeded below 2200â°C. High aspect ratio, platelet-like α-SiC grains formed and interconnected as interlocking structures. Toughness and flexural strength values of 5.4â±â1.2âMPaâm1/2 and 443â±â22âMPa were measured respectively. The toughening mechanisms by highly directional growth of discontinuous α-SiC grains were crack branching, bridging and deflection behaviors.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Buhao Zhang, Jie Yin, Yihua Huang, Jian Chen, Xuejian Liu, Zhengren Huang,