Evaluation of High Temperature Oxidation Behaviour of Nanostructured Cr/Co-Al Coatings

被引：9

作者：

Rahman, Atikur ^{[1
]}

Chawla, Vipin ^{[2
]}

Jayaganthan, R. ^{[1
]}

Chandra, Ramesh ^{[2
]}

Ambardar, R. ^{[3
]}

机构：

[1] Indian Inst Technol Roorkee, Dept Met & Mat Engn, Roorkee 247667, Uttar Pradesh, India

[2] Indian Inst Technol Roorkee, Inst Instrumentat Ctr, Roorkee 247667, Uttar Pradesh, India

[3] Natl Inst Technol Hazratbal, Dept Met Engn, Srinagar 190006, Jammu & Kashmir, India

来源：

OXIDATION OF METALS | 2010年 / 74卷 / 5-6期

关键词：

Sputtering; Cr/Co-Al coatings; Microstructures; High temperature oxidation; HOT-CORROSION BEHAVIOR; NI-CR ALLOYS; SELECTIVE OXIDATION; CYCLIC OXIDATION; GRAIN-SIZE; RESISTANCE; SCALE; NANOCRYSTALLIZATION; 900-DEGREES-C; SUPERALLOY;

D O I：

10.1007/s11085-010-9217-3

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The high temperature oxidation behavior of sputtered Cr/Co-Al coatings fabricated by DC/RF magnetron sputtering on a superalloy substrate has been studied in the present work. The microstructural features and phase formation of the as-deposited coatings were characterized by FE-SEM, AFM, and XRD, respectively. Weight-change measurements were made to calculate the cyclic oxidation kinetics of the coated superalloy exposed to air at 900 degrees C. It was observed that the corrosion rate of sputtered Cr/Co-Al coated superalloy is lower than that of the uncoated superalloy owing to the formation of continuous, dense, adherent and protective oxide scales over the surface of the coatings. The protective oxide scales in the corroded coatings were basically the thin layer of Cr2O3, CoO, Al2O3 and CoCr2O4, which provide protection to the base superalloy at high temperature.

引用

页码：341 / 358

页数：18

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