Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Si Addition on the Microstructure and Properties of Cr-Al alloy for High Temperature Coating

고온 코팅용 Cr-Al합금의 미세조직 및 특성에 미치는 Si 첨가의 영향

  • Kim, Jeong-Min (Department of Materials Science and Engineering, Hanbat National University) ;
  • Kim, Il-Hyun (Light Water Reactor Fuel Technology Division, Korea Atomic Energy Research Institute) ;
  • Kim, Hyun-Gil (Light Water Reactor Fuel Technology Division, Korea Atomic Energy Research Institute)
  • Received : 2018.09.28
  • Accepted : 2018.10.23
  • Published : 2019.01.27
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Abstract

Cr-Al alloys are attracting attention as oxidation resistant coating materials for high temperature metallic materials due to their excellent high temperature stability. However, the mechanical properties and oxidation resistance of Cr-Al alloys can be further enhanced, and such attempts are made in this study. To improve the properties of Cr-Al alloys, Si is added up to 5 wt%. Casting specimens with different amounts of Si content are prepared by a vacuum arc remelting method and isothermally heated under steam conditions at $1,100^{\circ}C$ for 1 hour. The as-cast microstructure of low Si alloys is mainly composed of only a Cr phase, while $Al_8Cr_5$ and $Cr_3Si$ phases are also observed in the 5 % Si alloy. In the high Si alloy, only Cr and $Cr_3Si$ phases remain after the isothermal heating at $1,100^{\circ}C$. It is found that Si additions slightly decrease the oxidation resistance of the Cr-Al alloy. However, the microhardness of the Cr-Al alloy is observed to increase with an increasing Si content.

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