Mechanical and dielectric properties of SiCf/SiC composites fabricated by PIP combined with CIP process

被引:32
作者
Hu, Yang [1 ]
Luo, Fa [1 ]
Duan, Shichang [1 ]
Zhou, Wancheng [1 ]
Zhu, Dongmei [1 ]
机构
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Dielectric properties; Mechanical properties; SiCf/SiC composites; Cold isostatic pressing; Infiltration and pyrolysis (PIP) process; PRECURSOR INFILTRATION; MATRIX COMPOSITES; SILICON-CARBIDE; FIBER; TEMPERATURE; INTERPHASE; CERAMICS;
D O I
10.1016/j.ceramint.2016.01.057
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
2D KD-1 SiC fiber fabrics were employed to fabricate SiCf/SiC composites by an improved polymer infiltration and pyrolysis (PIP) process, combined with cold isostatic pressing (CIP). The effect of CIP process on the microstructure, mechanical and dielectric properties of SiCf/SiC composites was investigated. The infiltration efficiency was remarkably improved with the introduction of CIP process. Compared to vacuum infiltration, the CIP process can effectively increase the infiltrated precursor content and decrease the porosity resulting in a dense matrix. Thus SiCf/SiC composites with high density of 2.11 g cm(-3) and low porosity of 11.3% were obtained at 100 MPa CIP pressure, together with an increase of the flexural strength of the composites from 89 MPa to 213 MPa. Real part (epsilon') and the imaginary part (epsilon '') of complex permittivity of SiCf/SiC composites increase and vary from 11.7-i9.7 to 15.0-i12.8 when the CIP pressure reaches 100 MPa. (c) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:6800 / 6806
页数:7
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