Identification of hot corrosion resistant MCrAlY based bond coatings for gas turbine engine applications

被引：118
作者：
Gurrappa, I [1 ]
机构：
[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
SURFACE & COATINGS TECHNOLOGY | 2001年 / 139卷 / 2-3期
关键词：
MCrAlY coatings; hot corrosion; gas turbines; electrochemical mechanism;
D O I：
10.1016/S0257-8972(00)01156-7
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In the current paper, an attempt has been made to identify hot corrosion resistant coatings which can produce a thermodynamically stable and inert oxide scale during exposure to a hot corrosion environment and thereby enhance the coating life significantly. The results obtained from hot corrosion tests of a variety of MCrAlY-type coatings with different alloying elements and traces of silicon and hafnium in the presence of sodium chloride and vanadium containing environments revealed that a NiCoCrAlY coating exhibits maximum life time among the coatings studied. The results also revealed that presence of trace elements in the coating reduces coating life significantly. Based on the results, a novel electrochemical mechanism has been proposed. It has been shown that the hot corrosion of protective coatings is an electrochemical phenomena and hence the electrochemical techniques appear to be quite useful in evaluating coatings for hot corrosion resistance. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：272 / 283
页数：12
相关论文
共 17 条
  • [11] Huntz AM, 1989, The Role of Active Elements in the Oxidation Behaviour of High Temperature Metals and Alloys, P81
  • [12] ADDITION OF YTTRIUM, CERIUM AND HAFNIUM TO COMBAT THE DELETERIOUS EFFECT OF SULFUR IMPURITY DURING OXIDATION OF AN NI-CR-AL ALLOY
    KHANNA, AS
    WASSERFUHR, C
    QUADAKKERS, WJ
    NICKEL, H
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1989, 120 : 185 - 191
  • [13] Knight R, 1998, THERMAL SPRAY, VOLS 1 AND 2, P1549
  • [14] Transformation and oxidation of a sputtered low-expansion Ni-Cr-Al-Ti-Si bond coating for thermal barrier systems
    Leyens, C
    Fritscher, K
    Peters, M
    Kaysser, WA
    [J]. SURFACE & COATINGS TECHNOLOGY, 1997, 94-5 (1-3) : 155 - 160
  • [15] Experimental observations in support of the dynamic-segregation theory to explain the reactive-element effect
    Pint, BA
    [J]. OXIDATION OF METALS, 1996, 45 (1-2): : 1 - 37
  • [16] DIFFERENCES IN GROWTH MECHANISMS OF OXIDE SCALES FORMED ON ODS AND CONVENTIONAL WROUGHT ALLOYS
    QUADAKKERS, WJ
    HOLZBRECHER, H
    BRIEFS, KG
    BESKE, H
    [J]. OXIDATION OF METALS, 1989, 32 (1-2): : 67 - 88
  • [17] Spallation of oxide scales from NiCrAlY overlay coatings
    Strawbridge, A
    Evans, HE
    Ponton, CB
    [J]. HIGH TEMPERATURE CORROSION AND PROTECTION OF MATERIALS 4, PTS 1 AND 2, 1997, 251-2 : 365 - 372
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