Heat insulation performance of functionally graded metal/ceramic coatings and fracture behavior under high heat flux

Hua Ping Xiong, Akira Kawasaki, Yan Sheng Kang, Ryuzo Watanabe

Research output: Contribution to journalArticlepeer-review

Abstract

Functionally graded metal/ceramic coatings with thicknesses varying from 0.75mm to 2.1 mm were designed and deposited onto a steel substrate by plasma spraying. The heat insulation performance of these coatings were studied. It was found that, at a given heat flux, the thicker specimens exhibited higher surface temperature (Ts), greater temperature difference (δT) and higher effective thermal conductivity (λeff). The thermal cycling test with a surface temperature of 1400°C (during heating) was also conducted for the study of fracture mode of the specimens. Furthermore, the fracture behavior of the coatings at high surface temperatures between 1500°C and 1700°C was investigated. The coating thickness and surface temperature were found to influence the number and the length of cracks. The results showed that thinner coatings were susceptible to local spallation at the top coat, and while, the thicker FGM coatings were susceptible to cracking at the interface close to the bond coat.

Original languageEnglish
Pages (from-to)260-265
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume51
Issue number4
DOIs
Publication statusPublished - 2004 Apr

Keywords

  • Crack
  • Fracture
  • Functionally graded material (FGM)
  • Thermal barrier coatings

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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