Mechanical properties of electrically conductive silicon carbide ceramics

被引：50

作者：

Lim, Kwang-Young ^{[1
]}

Kim, Young-Wook ^{[1
]}

Kim, Kwang Joo ^{[2
]}

机构：

[1] Univ Seoul, Dept Mat Sci & Engn, Funct Ceram Lab, Seoul 130743, South Korea

[2] Konkuk Univ, Dept Phys, Seoul 143701, South Korea

来源：

CERAMICS INTERNATIONAL | 2014年 / 40卷 / 07期

基金：

新加坡国家研究基金会;

关键词：

Microstructure-final; Mechanical properties; Electrical properties; SiC; HIGH-TEMPERATURE STRENGTH; SLIDING-WEAR PROPERTIES; RARE-EARTH-OXIDE; ALUMINUM NITRIDE; SIC CERAMICS; FRACTURE-TOUGHNESS; MICROSTRUCTURE; RESISTIVITY; ADDITIVES; DENSIFICATION;

D O I：

10.1016/j.ceramint.2014.03.036

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：

The mechanical properties of electrically conductive SiC ceramics sintered with 2 vol% Y2O3 were characterized. A submicron SiC powder and a mixture of submicron SiC powder and polycarbosilane (PCS) were hot-pressed with 2 vol% Y2O3 at 2000 degrees C for 6 h under an applied pressure of 40 MPa in a nitrogen atmosphere. The SiC without PCS had a finer microstructure consisting of equiaxed grains, whereas the SiC with PCS had a coarser microstructure with equiaxed grains. The coarser microstructure was beneficial in lowering the electrical resistivity but resulted in deteriorated mechanical properties. The typical flexural strength, micro-hardeness, fracture toughness, and electrical resistivity values of the SiC ceramics without PCS were 678 MPa, 30 GPa, 5.2 MPa m(1/2), and 7.8 x 10(-2) Omega cm at room temperature, respectively. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：10577 / 10582

页数：6

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