Pulsed electron beam treatment of MCrAlY bondcoats for EB PVD TBC systems part 2 of 2: Cyclic oxidation of the coatings

被引：15
作者：
Wellman, R. G. [1 ]
Scrivani, A.
Rizzi, G.
Weisenburger, A. [2 ]
Tenailleau, F. H. [1 ]
Nicholls, J. R. [1 ]
机构：
[1] Cranfield Univ, Cranfield MK43 0AL, Beds, England
[2] Forschungszentrum Karlsruhe GmbH, IHM, D-76021 Karlsruhe, Germany
来源：
SURFACE & COATINGS TECHNOLOGY | 2007年 / 202卷 / 4-7期
关键词：
oxidation; pulsed electron beam (PEB); TBC;
D O I：
10.1016/j.surfcoat.2007.06.037
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This paper discusses the effect of pulsed electron beam (PEB) treatment of thermal sprayed MCrAlY bondcoats on the cyclic life of thermal barrier coatings (TBCs). Standard MCrAlY bondcoats were produced via HVOF, VPS and LPPS thermal spray methods. Some of the HVOF and VPS coatings were then given a PEB treatment before all the samples were coated with an EB PVD 7-8 wt.% yttria partially stabilized zirconia topcoat. The samples were all tested under cyclic oxidation conditions at 1150 degrees C with 1 h at temperature and 15 min cooling, samples were removed after 20% coating spallation and prepared for cross sectional analyses. Cyclic testing revealed that although the PEB treatment had no measurable effect on the VPS sprayed samples, the HVOF coatings showed a significant increase in the cyclic life after the PEB treatment, The effect of the PEB treatment on the various samples is discussed as well as its effect on TGO growth morphology. PEB treatment of the HVOF bondcoat was found to reduce the rate of alumina growth and to suppress the formation of oxide pegs resulting in a smoother bondcoat interface. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：709 / 713
页数：5
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