Microstructural characterization of plasma-sprayed oxide ceramics.

• Kuroda Kotaro

  Department of Metallurgy, Faculty of Engineering, Nagoya University

• Hanagiri Seiji

  Fine Ceramics Development Department, Process Development Division, Plant Engineering and Technology Bureau, Nippon Steel Corporation

• Suginoshita Makoto

  Department of Metallurgy, Faculty of Engineering, Nagoya University

• Taira Hatsuo

  Fine Ceramics Development Department, Process Development Division, Plant Engineering and Technology Bureau, Nippon Steel Corporation

• Tamura Shin-ichi

  Fine Ceramics Development Department, Process Development Division, Plant Engineering and Technology Bureau, Nippon Steel Corporation

• Saka Hiroyasu

  Department of Metallurgy, Faculty of Engineering, Nagoya University

• Imura Toru

  Department of Metallurgy, Faculty of Engineering, Nagoya University

抄録

Microstructural and microchemical characterization has been carried out on plasma-sprayed zircon (ZrSiO₄) and alumina-chromia (Al₂O₃–5wt%Cr₂O₃) by transmission electron microscopy and energy dispersive X–ray analysis. The as–sprayed zircon coatings consist of zirconia and silica glass as a result of phase separation during rapid cooling in the plasma–spraying process. Zirconia shows a tetragonal structure for small particles and a monoclinic for large particles. The zircon coatings annealed at 1 300°C for 96 h in air show a mixture of zircon and monoclinic zirconia phases. Alumina–chromia coatings plasma–sprayed with N₂ gas consist mainly of a polycrystalline alumina–chromia solid solution with a typical grain size of 0.4 μm. Fine precipitates are observed frequently along the grain boundaries in the coatings sprayed with Ar–H₂ gas mixture or N₂–H₂ gas mixture. The fine precipitates are a metallic Cr–rich Cr–Al alloy formed by reduction of Cr₂O₃ and Al₂O₃ during the plasma-spraying process. These precipitates disappear during annealing at temperatures higher than 1 300°C for 96 h in air. The precipitates affect the wear resistance of the coatings.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 29 (3), 234-239, 1989

  一般社団法人 日本鉄鋼協会

キーワード

• plasma spraying
• ceramic coating, zircon
• alumina-chromia
• microstructure
• transmission electron microscopy
• wear resistance

詳細情報

• CRID: 1390282681429077760
• NII論文ID: 130000762381
• DOI: 10.2355/isijinternational.29.234
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/29/3/29_3_234/_pdf
• 本文言語コード: en
• 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