Oxidation resistance mechanism of ZrB2-Al2O3-Y2O3 composite particles

被引：2
|
作者：
Song, J. G. [1 ]
Li, J. G. [1 ]
Song, J. R. [1 ]
Zhang, L. M. [1 ]
机构：
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
来源：
SURFACE REVIEW AND LETTERS | 2007年 / 14卷 / 05期
基金：
中国国家自然科学基金;
关键词：
ZrB2; oxidation resistance; oxidation ratio; composite particles; multiphase ceramics;
D O I：
10.1142/S0218625X07010470
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：
Although ZrB2 has some excellent performances, it is easily oxidized in the high-temperature air, which is deadly shortcoming as high-temperature materials. To increase the high-temperature performances of ZrB2, Al2O3 and Y2O3 particles are coated on the ZrB2 surface to prepare ZrB2-Al2O3-Y2O3 composite particles. The oxidation resistance mechanism of ZrB2-Al2O3-Y2O3 composite particles is investigated by DTA-TG, TEM, and XRD. The surface of ZrB2 particle is coated with compact Al2O3 and Y2O3 particles, which establishes the foundation to attain good oxidation resistance. ZrB2 particle is mainly oxidized to increase the weight, from 600 degrees C to 800 degrees C. B2O3, obtained through the oxidization reaction, might coat on the surface of ZrB2 particle to retard the oxidization reaction, which further increases the oxidation resistance. The oxidation resistance of coated ZrB2 particle is far better than that of original ZrB2 particle.
引用
收藏
页码：945 / 950
页数：6
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