Stepwise Oxidation Mechanism of HVOF Sprayed NiCrAlY Coatings in Air

被引：6
作者：
Rana, Nidhi [1 ]
Jayaganthan, R. [1 ]
Prakash, Satya [1 ]
机构：
[1] Indian Inst Technol, Dept Met & Mat Engn, Roorkee 247667, Uttar Pradesh, India
来源：
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS | 2014年 / 67卷 / 03期
关键词：
Coating; Oxidation; Diffusion; YTTRIUM ADDITIONS; ALUMINA SCALES; ALLOYS; BEHAVIOR;
D O I：
10.1007/s12666-013-0362-7
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
High velocity oxide fuel sprayed NiCrAlY coatings on the Superni 76 superalloy have been oxidized cyclically at 900 A degrees C up to 200 cycles. Weight change measurements were taken after each cycle to obtain kinetics of the oxidation process. The surface and cross-section of oxidized samples have been examined by XRD, FESEM/EDS to characterize the corrosion products. The formation of Al2O3 at the surface as well as at the coating/scale interface as a sub-layer was observed. Other oxides such as Ni (Al, Cr)(2)O-4 and Cr2O3 were also present above this Al2O3 sub-layer. An oxidation mechanism has been proposed for the oxidation of the coating for 200 cycles by correlating the results after different cycles of oxidation.
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页码：393 / 400
页数：8
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