Effect of laser-cracking method of Zro2/Ni thermal barrier coating composed of functionally graded materials evaluated by combustion gas of Nto/mmh propellant

Yukio Kuroda, Shin Ichi Moriya, Makoto Tadano, Masahiro Sato, Akio Moro, Masayuki Niino, Qing Jie Zhang, Takayuki Sudo, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

Abstract

Evaluation test of the laser cracking specimens applied to the ZrO 2/Ni functionally graded materials (FGM) and also applied to the non-FGM has been described. In this test, 30 mm disk specimens of these materials were exposed to the combustion gas of nitrogen tetroxide (NTO)/ monomethyl hidrazine (MMH) propellant. The delamination and the vertical crack formation of the ZrO2 thermal barrier coating were observed during the heating test. It has been found that the laser cracking method seemed to be effective at preventing delamination in the coating layer of the test specimens. The crack and the delamination formation mechanism for ZrO2/Ni FGM test specimens were also discussed with a thermal stress analysis by using a finite element method.

Original languageEnglish
Pages (from-to)1168-1175
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume64
Issue number621
DOIs
Publication statusPublished - 1998

Keywords

  • Ceramics
  • Crack propagation
  • Finite element method
  • Functionally graded materials
  • Laser cracking
  • Rocket engine

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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