Highly dense β-SiC ceramics with submicron grains prepared by sintering of nanocrystalline powders

被引：13

作者：

Liu, Guanghua ^{[1
]}

Li, Jiangtao ^{[1
]}

Shan, Yingchun ^{[2
]}

Xu, Jiujun ^{[2
]}

机构：

[1] Chinese Acad Sci, Key Lab Funct Crystals & Laser Technol, Tech Inst Phys & Chem, Beijing 100190, Peoples R China

[2] Dalian Maritime Univ, Dept Mat Sci & Engn, Dalian 116026, Peoples R China

来源：

SCRIPTA MATERIALIA | 2012年 / 67卷 / 04期

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

Ceramics; SiC; Submicron grains; Sintering; Nanocrystalline powder; PHASE; ADDITIVES; BEHAVIOR;

D O I：

10.1016/j.scriptamat.2012.05.037

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Highly dense beta-SiC ceramics (99.1% TD) with an average grain size of <1 mu m were prepared by hot pressing of nanocrystalline beta-SiC powders. Large samples with a diameter of 150 mm were produced, showing a hardness of 24.9 +/- 0.7 GPa and a fracture toughness of 4.4 +/- 0.2 MPa m(1/2). During the hot pressing, the densification was expected to be facilitated by the assistance of liquid and the high sinterability of the nanosized crystallites, and was little hindered by the high degree of agglomeration in the starting powder. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：416 / 419

页数：4

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