Influence of Al2O3 on the oxidation resistance of SiC ceramic: First-principle study and experiment

被引：25

作者：

Cheng, Chunyu ^{[1
]}

Li, Hejun ^{[1
]}

Fu, Qiangang ^{[1
]}

Li, Lu ^{[1
]}

Guo, Liping ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Shaanxi Key Lab Fiber Reinforced Light Composite, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

来源：

CORROSION SCIENCE | 2018年 / 134卷

基金：

中国国家自然科学基金;

关键词：

Al2O3; SiO2; Oxidation; First principle; COATED C/C COMPOSITES; NANOWIRES; SILICA; OXYGEN; CO;

D O I：

10.1016/j.corsci.2018.02.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of Al2O3 on the oxidation resistance of SiC was studied by first-principle calculation and oxidation test. The oxidation process of the Al2O3-doped SiC ceramic divides into three stages. At first, Al atom diffuses into the generated SiO2 and substitutes Si atom to form -Al-O-Si- ring. Then, the ring is damaged due to the reaction between the O atom in Al-O bond and CO molecule, causing a CO2 molecule and an O vacancy formation. Finally, once O-2 or another CO molecule approaches O vacancy, -Al-O-O-Si- or -Al-O-C-Si- ring will be formed to recover the network structure of SiO2.

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收藏

页码：57 / 63

页数：7

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