A route to increase fracture toughness of layered Si3N4/SiC composite using interlocked interfaces

被引：17

作者：

Ye, Feng ^{[1
]}

Liu, Shichao ^{[1
]}

Hu, Shengqing ^{[2
]}

Yang, Haixia ^{[1
]}

Liu, Qiang ^{[1
]}

Zhang, Biao ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[2] Cent S Univ, Powder Met Res Inst, Changsha 410083, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2015年 / 41卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Mechanical property; Multi layer composite; Interlocked interface; Aqueous tape casting; MECHANICAL-PROPERTIES; MULTILAYER COMPOSITES; SILICON; CERAMICS; FABRICATION; BEHAVIOR;

D O I：

10.1016/j.ceramint.2015.04.102

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：

Multilayer Si3N4/SiC composite with interwoven interfaces was designed and prepared via the aqueous tape casting and gas pressure sintering process. This composite had relatively uniform layer thickness, high strength (similar to 564 MPa), toughness (similar to 16.8 MPa m(1/2)) and work-of-fracture (similar to 4411 J/m(2)). The first-level toughening mechanism started from the fracture surface of the multilayer composite. Obvious crack deflection was found in the Si3N4 and SiC layers. At the same time, the pullout and fractured rodlike beta-Si3N4 grains were detected along the interfaces of the composite. The growth of the rodlike beta-Si3N4 grains (the grain size > 50 mu m) along the interfaces was determined by the vapor phase transport mechanism. Both rich SiO2 on the surfaces of the SiC/Si3N4 particles and high porosity of the SiC layers were contributed to the growth of beta-Si3N4 grains. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：10331 / 10335

页数：5

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