KD-S和KD-Ⅱ SiC<sub>f</sub>/SiC复合材料的制备、微观结构及性能

王洪磊; 周新贵; 彭述明; 张海斌; 周晓松

doi:10.1016/S1872-5805(19)60010-7

KD-S和KD-Ⅱ SiC_f/SiC复合材料的制备、微观结构及性能

doi: 10.1016/S1872-5805(19)60010-7

1.
中国工程物理研究院核物理与化学研究所先进陶瓷创新团队, 四川绵阳 621900;
2.
国防科技大学陶瓷纤维及其复合材料重点实验室, 湖南长沙 410073

基金项目: 国家自然科学基金（51502343，91426304）.

详细信息

通讯作者:
王洪磊,博士,副教授.E-mail:honglei.wang@163.com

中图分类号: TQ33
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出版历程
- 收稿日期: 2018-03-01
- 录用日期: 2019-04-30
- 修回日期: 2019-03-20
- 刊出日期: 2019-04-28

Fabrication, microstructures and properties of SiC_f/SiC composites prepared with two kinds of SiC fibers as reinforcements

1.
Innovation Research Team for Advanced Ceramics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;
2.
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China

Funds: National Natural Foundation of China(51502343,91426304).

摘要

摘要: 以KD-S和KD-Ⅱ型碳化硅（SiC）纤维编织件为增强体，通过先驱体浸渍裂解工艺制备了以热解炭（PyC）为界面涂层的三维（3D）结构SiC_f/SiC复合材料，系统研究了SiC_f/SiC复合材料的微观结构及性能间的关系。结果表明：KD-S和KD-Ⅱ型SiC纤维均具有晶粒尺寸为8~15 nm的多晶结构；两种SiC_f/SiC复合材料的断口表面均出现了纤维拔出现象，说明两种SiC纤维增强的SiC_f/SiC复合材料均具有典型的伪塑性断裂行为。KD-S SiC_f/SiC复合材料的弯曲强度、弹性模量和断裂韧性分别达到（955.0±42.8） MPa，（110.3±1.7） GPa和（28.5±2.8） MPa·m^1/2，明显高于KD-ⅡSiC_f/SiC复合材料，这归因于近化学计量比的KD-S型SiC纤维具有较高的模量和耐温性能。由于KD-S和KD-Ⅱ型SiC纤维的结构及成分差异，导致KD-S型SiC纤维表面的PyC界面涂层呈现光滑的多层有序结构，而KD-Ⅱ型SiC纤维表面的PyC为疏松颗粒状结构。
- 碳化硅 /
- 复合材料 /
- 制备工艺 /
- 微观结构 /
- 先驱体浸渍裂解
Abstract: Three-dimensional (3D) SiC/SiCf composites were fabricated by a polymer impregnation and pyrolysis (PIP) method using 3D four directional braided preforms from two kinds of SiC fibers as the reinforcements and liquid polycarbosilane as the SiC precursor. Both kinds of SiC fibers were prepared from the same precursor and process but with different heat treatment temperatures. The one prepared at a higher temperature (No.1) had a higher crystallinity than the another one (No.2). A thin pyrolytic carbon (PyC) interlayer was coated on the preforms by a methane CVD method before impregnation. Their microstructures and mechanical properties were investigated by TEM, SEM, Raman spectroscopy and mechanical tests. Results showed that both had a polycrystalline structure with grain sizes of 8-15 nm. Fiber pullout was seen from the fracture cross-section of the composites after a bending test, indicating pseudo-ductile fracture behavior. The composite using No.1 SiC fibers had an average flexural strength, elastic modulus and fracture toughness of 955.0±42.8 MPa, 110.3±1.7 GPa and 28.5±2.8 MPa·m^1/2, respectively, which are superior to those of the material formed using No.2 SiC fibers. This was ascribed to the high modulus and excellent thermal resistance of the stoichiometric No.1 SiC fibers. The PyC layer adhering to No.1 SiC fibers was ordered and smooth while that deposited on No.2 SiC fibers had a loose and granular microstructure, which was attributed to the different surface chemistries of the two types of SiC fibers.
- Silicon carbide /
- Composites /
- Fabrication /
- Microstructure /
- Polymer impregnation and pyrolysis

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