Hot corrosion and oxidation behavior of a novel Pt plus Hf-modified γ'-Ni3Al + γ-Ni-based coating

被引：66

作者：

Deodeshmukh, V. ^{[1
]}

Mu, N. ^{[1
]}

Li, B. ^{[1
]}

Gleeson, B. ^{[1
]}

机构：

[1] Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

SURFACE & COATINGS TECHNOLOGY | 2006年 / 201卷 / 07期

关键词：

gamma' plus gamma coating; hot corrosion; Na2SO4; oxidation;

D O I：

10.1016/j.surfcoat.2006.07.250

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A new type of Pt+Hf-modified gamma ''-Ni3Al+-y-Ni-based coating has been developed in which deposition involves Pt electroplating followed by combined aluminizing and hafnizing using a pack cementation process. Cyclic oxidation testing of both Pt+Hf-modified gamma ' + gamma and Pt-modified beta-NiAl coatings at 1150 degrees C (2102 degrees F), in air, resulted in the formation of a continuous and adherent alpha-Al2O3 scale; however, the latter developed unwanted surface undulations after thermal cycling. Type I (i.e. 900 degrees C/1652 degrees F) and Type II (i.e. 705 degrees C/1300 degrees F) hot corrosion behavior of the Pt+Hf-modified gamma ' + gamma coating were studied and compared to Pt-modified beta and gamma + beta-CoCrAIY coatings. Both types of hot corrosion conditions were simulated by depositing Na2SO4 salt on the coated samples and then exposing the samples to a laboratory-based furnace rig. It was found that the Pt+Hf-modified gamma ' + gamma and Pt-modified beta coatings exhibited superior Type II hot corrosion resistance compared to the gamma + beta-CoCrAlY coating; while the Pt+Hf-modified gamma ' + gamma and gamma + beta-CoCrAIY coatings showed improved Type I hot corrosion performance than the Pt-modified P. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：3836 / 3840

页数：5

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