Microstructure and fracture behavior of β-Si3N4 based nanoceramics

被引：16

作者：

Lee, Ching-Huan ^{[1
]}

Lu, Horng-Hwa ^{[2
]}

Wang, Chang-An ^{[3
]}

Lo, Wen-Tse ^{[1
]}

Nayak, Pramoda K. ^{[1
]}

Huang, Jow-Lay ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 701, Taiwan

[2] Natl Chin Yi Univ Technol, Dept Mech Engn, Taichung 411, Taiwan

[3] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2011年 / 37卷 / 02期

关键词：

Microstructure; Fracture; Silicon nitride; Nanoceramic; Spark plasma sintering; SILICON-NITRIDE CERAMICS; TRIBOLOGICAL PROPERTIES; NANO-CERAMICS; FABRICATION; TOUGHNESS; DEFORMATION; DESIGN;

D O I：

10.1016/j.ceramint.2010.10.009

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：

Fully dense beta-Si3N4 based nanoceramics were consolidated by spark plasma sintering (SPS). A commercially available beta-Si3N4 nano-powder was used as starting material. The sintering bulks were fabricated with a heating rate of 90 degrees C/min by varying SPS temperature from 1550 degrees C to 1700 C, and the linear shrinkage was used to evaluate the sintering behavior of the nano-powder. The microstructures of the developed Si3N4 based ceramics were achieved, and the grain length, grain width, and aspect ratio for these sintering bulks were found to increase gradually with elevating sintering temperature. The hardness and fracture toughness are associated with the microstructural characteristics. The crack propagation and fracture behavior for these beta-Si3N4 based nanoceramics have been observed for the specimens sintered at different sintering temperatures. Crack deflection is found to be one of the toughening mechanisms for these beta-Si3N4 based nanoceramics. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：641 / 645

页数：5

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