Polymer-Derived SiC/B4C/C Nanocomposites: Structural Evolution and Crystallization Behavior

被引:15
作者
Jiang, Yun [1 ]
Li, Junfei [1 ]
Huang, Farong [1 ]
Zhou, Yan [1 ]
Du, Lei [1 ]
机构
[1] E China Univ Sci & Technol, Inst Mat Sci & Engn, Minist Educ, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China
关键词
B-C-N; CARBIDE COMPOSITE CERAMICS; PRECURSORS; POLYCARBOSILANES; GRAPHITE; KINETICS; GLASSES; UNITS;
D O I
10.1111/jace.12670
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
Structural evolution and crystallization behavior between 600 degrees C and 1450 degrees C during the preparation of bulk SiC/B4C/C nanocomposites by the pyrolysis of CB-PSA preceramic were investigated. The CB-PSA preceramic converts into carbon-rich Si-B-C ceramics up to 800 degrees C. Structural evolution and crystallization of Si-B-C materials could be controlled by adjusting the pyrolytic temperature. The Si-B-C ceramics are amorphous between 800 degrees C and 1000 degrees C. Phase separation and crystallization begin at 1100 degrees C. The crystallization of beta-SiC takes place at 1100 degrees C and B4C nanocrystallites generate at 1300 degrees C. The sizes of beta-SiC and B4C nanocrystals increase with the pyrolytic temperature rising. In addition, the boron-doping effect on structural evolution was studied by comparing the crystallization and graphitization behavior of Si-B-C ceramics and the corresponding Si-C materials. Boron is helpful for the growth of beta-SiC nanocrystals and the graphitization, but harmful for the nucleation of beta-SiC crystallites.
引用
收藏
页码:310 / 315
页数:6
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