Effect of Cation Extraction on the Oxidation Resistance of Si_3N_4

Jianqing Wu; Fangli Yuan; Xinjun ZengPinggen Rao

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Effect of Cation Extraction on the Oxidation Resistance of Si_3N_4

机译：Effect of Cation Extraction on the Oxidation Resistance of Si_3N_4

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A new method called cation extraction process has been applied to improve the oxidation resistance of silicon nitride ceramics with sintering additives. It is found that the high temperature oxidation rate of the Si_3N_4 ceramic treated by the process decreased remarkably in contrast to the oxidation rate of the Si_3N_4 without the process. The oxidation rate of Si_3N_4 ceramics with the cation extraction process is reduced more than 50 comparing with that of the Si_3N_4 ceramics without the process. The morphological characteristic and phase composition of the oxides were analyzed by means of SEM and XRD. The oxidation rate of silicon nitride after cation extraction treatment is determined by the quality of the "purified layer" formed below the pre-oxide scale. Thicker oxide layer formed in pre-oxidation, higher extraction temperature and longer extraction time are helpful to form a good "purified layer".

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来源
《Key engineering materials》 |2005年第2期|1263-1266|共4页
作者
Jianqing Wu; Fangli Yuan; Xinjun ZengPinggen Rao;
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作者单位

Key Lab of Functional Materials and Advanced Processing Technology of Ministry of Education, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;

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原文格式 PDF
正文语种英语
中图分类工程基础科学;
关键词
oxidation; silicon nitride; cation extraction;

Effect of Cation Extraction on the Oxidation Resistance of Si_3N_4

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