Effect of Si and Zr additions on oxidation resistance of hot-pressed ZrB2-SiC composites with polycarbosilane as a precursor at 1500 °C

被引：30

作者：

Guo, Wei-Ming ^{[1
]}

Zhou, Xiao-Jun ^{[1
,2
]}

Zhang, Guo-Jun ^{[1
]}

Kan, Yan-Mei ^{[1
]}

Li, Yao-Gang ^{[2
]}

Wang, Pei-Ling ^{[1
]}

机构：

[1] Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Donghua Univ, Sch Mat, Shanghai 200051, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 471卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

Composite materials; Microstructure; Oxidation; HIGH TEMPERATURE CERAMICS; DIBORIDE-SILICON CARBIDE; 1500-DEGREES-C; AIR;

D O I：

10.1016/j.jallcom.2008.02.108

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Three ZrB2-SiC composites were prepared from polycarbosilane (PCS)-coated ZrB2 powders. Powders with or without additions of Si or Zr were densified by hot pressing at 1800 degrees C. Finally, the oxidation resistance of the composites was studied at 1500 degrees C in air. The phase composition and microstructure were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) along with energy-dispersive spectroscopy (EDS). Results showed that Si addition, which reacted with free carbon coming from the pyrolyzed PCS to produce the SiC, improved the oxidation resistance of ZrB2-SiC composites with PCS as a precursor, whereas Zr addition, which reacted with the carbon to produce the ZrC, decreased it. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：153 / 156

页数：4

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