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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.1 pp.7-10

Effects of Si Addition on the Microstructure and Properties of Cr-Al alloy for High Temperature Coating

Jeong-Min Kim1†, Il-Hyun Kim2, Hyun-Gil Kim2
1Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
2Light Water Reactor Fuel Technology Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
Corresponding author
E-Mail : (J.-M. Kim, Hanbat Nat’l Univ.)


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 1,100oC for 1 hour. The as-cast microstructure of low Si alloys is mainly composed of only a Cr phase, while Al8Cr5 and Cr3Si phases are also observed in the 5% Si alloy. In the high Si alloy, only Cr and Cr3Si phases remain after the isothermal heating at 1,100oC. 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.

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