Effects of Silicon Addition on Nickel-Aluminide Surface Coatings through Combustion Synthesis

DOI Web Site 17 References
  • Okamoto Akira
    Technology Research Institute of Osaka Prefecture
  • Ikenaga Akira
    Faculty of Engineering, Osaka Prefecture University
  • Yoshimoto Tsutomu
    Faculty of Engineering, Osaka Prefecture University
  • Hirose Yukio
    Department of Material Science and Engineering, Kanazawa University
  • Ri Kannei
    Professor Department of Advanced Materials Engineering, Keimyung University in Korea

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Other Title
  • 燃焼合成を利用したNi-Al系表面被覆層に及ぼすけい素添加の影響
  • ネンショウ ゴウセイ オ リヨウ シタ Ni Alケイ ヒョウメン ヒフクソウ ニ オヨボス ケイソ テンカ ノ エイキョウ

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  Ni-Al intermetallic compounds containing silicon were coated onto a spheroidal graphite cast iron substrate through combustion synthesis. In this paper, effects of silicon addition on coating characteristics, such as constituents, hardness, wear resistance and adhesive strength, were investigated. A differential thermal analysis exhibited that silicon addition to Ni-Al green powder compacts lowered both a combustion and an ignition temperature with an increasing exothermic value. All of the coating layers consisted of multi-constituents with layers along the bonding interface. Al-Si liquid phase generated in the silicon added coating decreased void fraction in coating layers. Synthesized nickel aluminide coating layers had hardness of over 600 HV in the silicon addition up to 9 atomic percent. All of the coating layers showed drastically improved wear resistance compared with that of an FCD substrate. Adhesive strength of coatings was improved by silicon addition to Ni-Al green powder compacts due to thinning of the brittle layer along the bonding interface.

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