Segmentation cracks in plasma sprayed thin thermal barrier coatings

Hongbo Guo, Hideyuki Murakami, Seiji Kuroda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Thick thermal barrier coatings (TBCs) containing segmentation cracks have seen a successful application in combustion chamber parts. In this work, rather thin TBCs were produced by spraying yttria stabilized zirconia (YSZ) coatings onto two kinds of bond coats: CoNiCrAlY and Pt-Ir. The effects of process parameters including substrate temperature on the density of segmentation cracks were studied. The thermal cycling performance and failure mechanisms of the segmented thin TBCs were also investigated. The coating sprayed at 1073 K contains a segmentation crack density of approximately 5 mm-1. The segmented coatings significantly improved the thermal cycling lifetime as compared with the non-segmented coatings. The segmented TBC with Pt-Ir bond coat attained a lifetime of more than 5000 cycles (each cycle includes 3 minute heating up to the maximum temperature and 7 minute holding at the temperature), revealing an excellent thermal cycling performance.

Original languageEnglish
Title of host publicationAdvanced Ceramic Coatings and Interfaces - A Collection of Papers Presented at the 30th International Conference on Advanced Ceramics and Composites
Pages17-27
Number of pages11
Edition3
Publication statusPublished - 2006 Dec 1
Externally publishedYes
EventAdvanced Ceramic Coatings and Interfaces - 30th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
Duration: 2006 Jan 222006 Jan 27

Publication series

NameCeramic Engineering and Science Proceedings
Number3
Volume27
ISSN (Print)0196-6219

Other

OtherAdvanced Ceramic Coatings and Interfaces - 30th International Conference on Advanced Ceramics and Composites
CountryUnited States
CityCocoa Beach, FL
Period06/1/2206/1/27

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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