Enhanced High Temperature Corrosion Resistance of Al2O3/Al Composite Coating on γ-TiAl Alloy

被引：6

作者：

Xu Yi ^{[1
]}

Liang Wenping ^{[1
]}

Miao Qiang ^{[1
]}

Wang Ling ^{[1
]}

Ren Beilei ^{[1
]}

Cui Shi-yu ^{[1
]}

Xia Jinjiao ^{[1
]}

Yao Zhengjun ^{[1
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Nanjing 211106, Jiangsu, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2018年 / 47卷 / 04期

基金：

中国国家自然科学基金;

关键词：

gamma-TiAl; Al2O3/Al coating; corrosion resistance; gradient structure; OXIDATION BEHAVIOR; HOT CORROSION; 8NB-TIAL ALLOY; INTERMETALLICS; PERFORMANCE; AIR; CR;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

gamma-TiAl specimens were coated with an Al2O3/Al composite coating using magnetron sputtering. The corrosion resistance of the coated specimens was investigated in molten salt environment of 100 wt% Na2SO4 at 850 degrees C. Results show that the Al2O3/Al composite coating improves the high temperature corrosion resistance of gamma-TiAl alloy effectively. The good resistance is attributed to the gradient structure of Al2O3/Al composite coating which consists of an Al2O3 top-layer, an Al-rich interlayer and a diffusion layer. The results of corrosion test reveal that the Al2O3 , TiO2 and TiAl3 are identified as the main phase structure of the corroded coating surface. Moreover, the sealed coating structure could effectively suppress the erosion of O2-, S2- and Na+, while Al2O3/Al coating with gradient structure exhibits superior crack and spallation resistance.

引用

页码：1075 / 1081

页数：7

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