Oxidation Behavior of Al2O3 Coating on Ti-25Al-12.5Nb Alloy

被引：4

作者：

Maecka, J. ^{[1
]}

机构：

[1] Opole Univ Technol, S Mikolajczyka 5 St, PL-45271 Opole, Poland

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2016年 / 25卷 / 07期

关键词：

coatings; high temperature corrosion; orthorhombic alloys; oxidation; TI-AL-O; SYSTEM; TITANIUM;

D O I：

10.1007/s11665-016-2098-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The oxidation behavior of Al2O3 coating deposited on Ti-25Al-12.5Nb alloy by sol-gel method was investigated at 700 and 800 A degrees C under isothermal oxidation conditions in air. At both temperatures, the coated samples exhibited reduced mass gain compared to uncoated alloy; at 700 A degrees C rather insignificant differences were observed; however, at the temperature of 800 A degrees C, the deposited coating strongly limits the mass gain of the test material. As a consequence of the isothermal oxidation a scale forms containing mainly TiO2 on the alloy surface of the uncoated alloy, while during the oxidation of the coated alloy the surface coating of Al2O3 dissociated and the initially compact Al2O3 coating dissolved and its place was taken by a porous scale. These coated samples displayed good resistance to oxidation in set conditions and no zones of dissolved oxygen and nitrogen were recorded. No spallation of the coated samples was observed.

引用

页码：2951 / 2958

页数：8

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