Microstructure and properties of nano-laminated Y3Si2C2 ceramics fabricated via in situ reaction by spark plasma sintering

• 作者: Lin-Kun SHI Xiaobing ZHOU Jian-Qing DAI Ke CHEN Zhengren HUANG Qing HUANG
• 来源期刊: 先进陶瓷（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Research Article
• 页码范围: 578-586
• 页数: 9页
• 语种: 英文

摘要

A nano-laminated Y3Si2C2 ceramic material was successfully synthesized via an in situ reaction between YH2 and SiC using spark plasma sintering technology.A MAX phase-like ternary layered structure of Y3Si2C2 was observed at the atomic-scale by high resolution transmission electron microscopy.The lattice parameters calculated from both X-ray diffraction and selected area electron diffraction patterns are in good agreement with the reported theoretical results.The nano-laminated fracture of kink boundaries,delamination,and slipping were observed at the tip of the Vickers indents.The elastic modulus and Vickers hardness of Y3Si2C2 ceramics (with 5.5 wt％ Y2O3) sintered at 1500 ℃ were 156 and 6.4 GPa,respectively.The corresponding values of thermal and electrical conductivity were 13.7 W·m-1 ·K-1 and 6.3× 105 S·m-1,respectively.