Densification, β → αtransformation and nanoindentation studies of SiCW/SiC composites fabricated by spark plasma sintering

被引：0
作者：
Lodhe, Mangesh [1 ]
Bhargav, Amit [1 ]
Wasan, Awin [2 ]
Logesh, G. [2 ]
Parmar, Rajeev [3 ]
Balasubramanian, M. [2 ]
机构：
[1] Maulana Azad Natl Inst Technol, Dept Mat & Met Engn, Bhopal 462003, India
[2] Indian Inst Technol Madras, Dept Met & Mat Engn, Chennai 600036, India
[3] Maulana Azad Natl Inst Technol, Dept Chem Engn, Bhopal 462003, India
来源：
JOURNAL OF THE KOREAN CERAMIC SOCIETY | 2024年 / 61卷 / 04期
关键词：
SiCW/SiC; Densification; Spark plasma sintering; Twin boundaries (TBs); MECHANICAL-PROPERTIES; CARBON; CERAMICS; MICROSTRUCTURE;
D O I：
10.1007/s43207-024-00384-y
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Polycarbosilane-derived SiCW/SiC composites were processed by spark plasma sintering (SPS). Whisker-reinforced composites were densified with faster rates to a maximum density of similar to 98%, indicative of positive influence of SiC whiskers on densification behavior. Electron backscattered diffraction study confirmed the presence of twins in the sintered composites. A misorientation angle of 60 degrees resembled to {111} twin boundaries. Twin density was found to increase with SPS temperature and whisker contest. Twin boundaries were found to be responsible for beta -> alpha SiC transformation. Hardness increased sharply with the increase in whisker content and a decrease in grain size. The maximum hardness of 23.4 GPa was observed in 20% SiCW/SiC composite. Nanoindentation study reflects the positive effect of whiskers on hardness and elastic modulus.
引用
收藏
页码：644 / 653
页数：10
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