Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Manufacturing and Properties of Al-Al2O3 Composite Coating Layer Using Warm Spray Process

Warm spray를 이용한 알루미늄-알루미나 복합 코팅층의 제조 및 특성

  • Kwon, Eui-Pyo (Carbon & Light Materials Application R&D Group, Korea Institute of Industrial Technology) ;
  • Lee, Jong-Kweon (Product Development Division, Sewon Hardfacing Co. Ltd.)
  • 권의표 (한국생산기술연구원 탄소경량소재응용그룹) ;
  • 이종권 ((주)세원하드페이싱 제품개발부)
  • Received : 2017.05.29
  • Accepted : 2017.06.19
  • Published : 2017.07.27
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Abstract

Properties of coatings produced by warm spray were investigated in order to utilize this technique as a repair method for Al tire molds. $Al-(0-10%)Al_2O_3$ composite powder was sprayed on Al substrate by warm spraying, and the microstructure and mechanical properties of the composite coating layer were investigated. For comparative study, the properties of the coating produced by plasma spray, which is a relatively high-temperature spraying process, were also investigated. The composite coating layers produced by the two spray techniques exhibited significantly different morphology, perhaps due to their different process temperatures and velocities of particles. Whereas the $Al_2O_3$ particles in the warm sprayed coating layer maintained their initial shape before the spray, flattened and irregular shape $Al_2O_3$ particles were distributed in the plasma sprayed coating layer. The coating layer produced by warm spray showed significantly higher adhesive strength compared to that produced by plasma spray. Hardness was also higher in the warm sprayed coating layer compared to the plasma sprayed one. Moreover, with increasing the fraction of $Al_2O_3$, hardness gradually increased in both spray coating processes. In conclusion, an $Al-Al_2O_3$ composite coating layer with good mechanical properties was successfully produced by warm spray.

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References

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