해양환경 하에서 Ni-Cr계 자용성 합금 코팅된 ALBC3 합금의 캐비테이션 특성 평가 = Evaluation of Cavitation Characteristics for ALBC3 Alloy Coated with Ni-Cr Series Self Fluxing Alloy in Marine Environment

국문 초록 (Abstract)

본 연구에서는 ALBC3 합금에 Ni기 자용성 합금으로 내마모성 및 내캐비테이션 특성을 향상시키기 위하여 용사코팅 후 열처리를 실시하여 캐비테이션 특성을 평가하였다. 본 연구 결과, 자용성 합금 코팅층이 높은 경도를 나타내어 내마모성이 우수할 것으로 판단되나, 다공질의 조직으로 인해 열악한 내캐비테이션 특성을 나타냈다. 따라서 열처리 조건의 최적화가 중요하며, 본 조건에서는 열처리 온도를 높여 자용성 합금 내 B와 Si의 유동성을 증가시킴으로써 기공이나 결함을 제거하여 특성개선 효과를 기대할 수 있을 것으로 판단된다.

다국어 초록 (Multilingual Abstract)

In this study, cavitation characteristics of a thermal spray coating were evaluated in order to improve durability and cavitation resistance. For a coating material, a Ni-based self-fluxing alloy was thermal-sprayed over a ALBC3 alloy substrate and subsequently modified by heat treatment.The resulted self-fluxing coating layer had relatively high hardness compared to the base material, and thus would be expected to exhibit good durability. However, the cavitation characteristics were deteriorated due to the intrinsic porous structure of the coating. Therefore, it is essential to optimize heat treatment condition during thermal spraying coating process for self-fluxing alloy, and in this research the increase in heat treatment temperature is thought to increase the fluidity of B and Si in the self-fluxing alloy and to remove pores or defects, leading to the characteristics enhancement.

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