Microstructure and high temperature strength of SiCW/SiC composites by chemical vapor infiltration

被引：19

作者：

Hua, Yunfeng ^{[1
,2
]}

Zhang, Litong ^{[1
]}

Cheng, Laifei ^{[1
]}

Li, Zhengxian ^{[2
]}

Du, Jihong ^{[2
]}

机构：

[1] NW Polytech Univ, Natl Key Lab Thermostruct Composite Mat, Xian 710072, Peoples R China

[2] NW Inst Nonferrous Met Res, Xian 710072, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 21-22期

关键词：

Electron microscopy; Ceramics; Composites; Fracture; Interfaces; Chemical vapor infiltration (CVI); SINTERED SILICON-CARBIDE; SIC-BASED CERAMICS; MECHANICAL-PROPERTIES; ALUMINUM NITRIDE; PHASE; ALN; RESISTANCE; TOUGHNESS; CREEP; OXIDE;

D O I：

10.1016/j.msea.2010.05.042

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

SiCW/SiC composites without an intergranular glassy phase are prepared by the CVI process. The microstructure and high temperature strength of SiCW/SiC composites are investigated. The high temperature strength of SiCW/SiC composites depends on the interfacial bonding strength between matrix and whiskers. The matrix is effectively strengthened and toughened by the whiskers, and SiCW/SiC composites show a constant strength of 475 +/- 32 MPa below 1000 degrees C. The flexural strength gradually declines from 475 +/- 32 MPa to 208 +/- 15 MPa at the temperature from 1000 degrees C to 1500 degrees C due to the decreased whisker-matrix interfacial bonding strength. The interfacial bonding strength is too low to transfer stress from the matrix to the whiskers, and SiCW/SiC composites show a constant strength of 208 +/- 15 MPa at temperatures from 1500 degrees C to 1800 degrees C. The fracture mode of SiCW/SiC composites changes from the toughened fracture below 1000 degrees C to the brittle fracture above 1000 degrees C. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：5592 / 5595

页数：4

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