Ni-W diffusion barrier: Its influence on the oxidation behaviour of a β-(Ni,Pt)Al coated fourth generation nickel-base superalloy

被引：37

作者：

Cavaletti, E. ^{[1
]}

Naveos, S. ^{[1
]}

Mercier, S. ^{[1
]}

Josso, P. ^{[1
]}

Bacos, M. P. ^{[1
]}

Monceau, D. ^{[2
]}

机构：

[1] Off Natl Etud & Rech Aerosp, Metall Mat & Struct Dept, F-92320 Chatillon, France

[2] Univ Toulouse, Inst Carnot CIRIMAT, ENSIACET, F-31077 Toulouse 04, France

来源：

SURFACE & COATINGS TECHNOLOGY | 2009年 / 204卷 / 6-7期

关键词：

Superalloy; Bondcoat; Diffusion barrier; Interdiffusion; Oxidation; Secondary reaction zone; SINGLE-CRYSTAL SUPERALLOYS; MARTENSITIC-TRANSFORMATION; PLATINUM; INTERDIFFUSION; SCALE;

D O I：

10.1016/j.surfcoat.2009.09.072

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A Ni-W base diffusion barrier (DB) has been developed to limit interdiffusion between a fourth generation Ni-base superalloy (MCNG) and a Pt-modified nickel aluminide bondcoat. After long term oxidation, the DB layer permits to reduce the Al depletion in the coating and to delay the phase transformations in the coating. But despite this result, the oxidation behaviour of the system with DB is slightly worse than without the DB. This difference may be caused by the addition of S and/or W in the coating of the system with the DB. The DB layer also delays the Secondary Reaction Zone (SRZ) formation. Nevertheless, the propagation of the SRZ is similar in systems with and without a DB, with growth kinetics which are driven by interdiffusion. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：761 / 765

页数：5

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