遮熱コーティングの界面破壊じん性と皮膜破壊じん性の関係

Translated title of the contribution: Relationship between Interfacial and Coating Fracture Toughnesses of Thermal Barrier Coating

Tomoya Tsuge, Hiroyuki Waki, Kanta Adachi, Tomohiko Hojo

Research output: Contribution to journalArticlepeer-review

Abstract

A thermal barrier coating (TBC) system consists of a substrate, a bond-coat (BC), and a top-coat (TC: TBC). The coatings are deposited by thermal spraying. The interfacial fracture toughness between TBC and BC is important mechanical property because it is necessary for damage assessment. The TBC system suffers from thermal exposure, and the interfacial fracture toughness is changed by the thermal exposure as well as the TBC toughness. However, there are few studies on the relationship between the interfacial and TBC toughnesses due to the difficulty of accurate comparison. The purpose of this study is to investigate the relationship between interfacial and TBC toughnesses. For this purpose, we evaluated the two toughnesses of thermally exposed TBC specimens using an indentation technique with an identical specimen and identical evaluation theory. Our results revealed that the interfacial fracture toughness was higher than the TBC fracture toughness for both the coatings as-sprayed and exposed at a moderate temperature. On the other hand, the TBC toughness became to be close to the interfacial toughness for the coatings exposed at high temperatures. Additionally, the convergence rate became to be high by higher treatment temperature. The interfacial cracks occurred not at the strict interface but at the TBC near the interface. These results suggested that interfacial toughness was essentially identical to coating toughness and the changes in the two toughnesses were caused by sintering of the TBC.

Translated title of the contributionRelationship between Interfacial and Coating Fracture Toughnesses of Thermal Barrier Coating
Original languageJapanese
Pages (from-to)863-868
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume69
Issue number12
DOIs
Publication statusPublished - 2020 Dec 15

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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