ＺｒＯ２／ＮｉＣｒＡｌＹ溶射皮膜の繰返し熱衝撃破壊挙動

• 福本 昌宏

  豊橋技科大

• 山崎 隆典

  日本車輌製造(株)

• 岡根 功

  豊橋技科大

書誌事項

タイトル別名

• Fracture Behavior of ZrO2/NiCrAlY Plasma Sprayed Coatings under the Cyclic Thermal Shock Testing.

抄録

In order to make the test standard for thermal shock resistance of ceramic coatings, both fracture mechanisms of the coating and main factors for the fracture have to be clarified. In this study, cyclic thermal shock testings were carried out on the ZrO₂/NiCrAlY plasma sprayed coatings, and unsteady thermal stress analyses by FEM were also conducted on these testings. The results obtained are summarized as follows.<BR>(1) ZrO₂ coatings were suddenly spalled off completely during or just after the cooling process, after some cycles of thermal shock.<BR>(2) Fracture took place at the interface of ZrO₂ sprayed particles about 10μm away from the ZrO₂/NiCrAlY interface.<BR>(3) From the results of unsteady FEM analyses, large compressive stress was recognized in the ZrO₂ coating during the cooling process.<BR>(4) From the results of both SEM observations and FEM analyses, it was revealed that the fracture of the coating was caused by unstable propagation of internal crack which was generated at the inside of the coating layer near the ZrO₂/NiCrAIY interface.

収録刊行物

• 溶接学会論文集

  溶接学会論文集 12 (1), 137-141, 1994

  一般社団法人 溶接学会

キーワード

• Plasma sprayed coating
• Thermal shock
• Thermal stress
• Fracture behavior
• FEM analysis
• Internal crack

詳細情報

• CRID: 1390282679700692736
• NII論文ID: 130003764408
• DOI: 10.2207/qjjws.12.137
• ISSN: 24348252
• ISSN: 02884771
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可