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Rapid fabrication of Si3N4 ceramics with gradient appearance and microstructure |
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| Authors: | Songmo Du Jie Zhang Fei Li Zhanglin Chen Shijia Zhang Shuo Zhao Wei Cui Kexin Chen Guanghua Liu |
| Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
Foshan (Southern China) Institute for New Materials, Foshan, China |
| Abstract: | Si3N4 ceramics with tailored gradient in color and microstructure were prepared by a rapid cost-effective one-step approach. The gradient microstructure was obtained by the manipulation of the dissolution-reprecipitation process, by controlling the sintering temperature and sintering additive content. In the Si3N4 ceramics, the β-phase content gradually changed from 84% to 11%. The Si3N4 ceramics exhibited white color on one side and showed a hardness of 19 GPa and fracture toughness of 7 MPa·m1/2 and may be suitable for bio-implantation applications. |
| Keywords: | bioceramic gradient silicon nitride sintering SPS |
