Influence of crystallinity of matrix on mechanical properties of fiber-reinforced composites prepared by polysilazanes as matrix precursor

被引:4
作者
Sato, K [1 ]
Morozumi, H [1 ]
Funayama, O [1 ]
Isoda, T [1 ]
机构
[1] Tonen Corp, Tonen Gen Corp, Corp Res & Dev Lab, Oi, Saitama 3568500, Japan
关键词
polysilazane; polymer impregnation and pyrolysis; silicon nitride based composite; heat resistance;
D O I
10.2109/jcersj.110.775
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
Fiber-reinforced ceramics were fabricated by using pehrydropolysilzane (PHS), polyborosilazane added PHS (PHS-B) or methylhydropolysilazane (MHS) as matrix precursors, and their mechanical properties were investigated with respect to the crystallinity of the matrix. By firing at 1523 K, MHS and PHS-B formed amorphous matrix and gave composites with the flexural strength of 820 and 920 MPa. PHS formed a crystalline matrix and gave a composite with a flexural strength of 450 MPa. The high strength composites may be brought by the lower elastic modulus of amorphous matrix as compared to the crystalline one. Because the low-elastic matrix decreases the stress concentration on fiber due to matrix-cracks. The heat resistance of the composite was tested upon heat exposure at 1523 K for 720 ks. The amorphous composite, fabricated by MHS at 1623 K, endured the heat exposure and retained 77% of its initial strength.
引用
收藏
页码:775 / 779
页数:5
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