Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Fabrication and Characterization of Cu-based Amorphous Coatings by Cold Spray Process

저온 분사를 이용한 Cu계 비정질 코팅층의 제조 및 특성 연구

  • 정동진 (안동대학교 공과대학 신소재공학부) ;
  • 박동용 ((주) 태광테크 기술연구소) ;
  • 이진규 (한국생산기술연구원 신기능소재팀) ;
  • 김형준 (포항산업과학연구원 용접연구실) ;
  • 이기안 (안동대학교 공과대학 신소재공학부)
  • Received : 2008.02.23
  • Published : 2008.05.22
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Abstract

Cu based amorphous ($Cu_{54}Zr_{22}Ti_{18}Ni_6$) coating was produced by cold spraying as a new fabrication process. The microstructure and macroscopic properties of amorphous coating layer was investigated and compared with those of cold sprayed pure Cu coating. Amorphous powders were prepared by gas atomization and Al 6061 was used as the substrate plate. X-ray diffraction results showed that Cu based amorphous powder could be successfully deposited by cold spraying without any crystallization. The Cu based amorphous coating layer ($300{\sim}400{\mu}m$ thickness) contained 4.87% porosity. The hardness of Cu based amorphous coating represented $412.8H_v$, which was correspond to 68% of the hardness of injection casted bulk amorphous material. The wear resistance of Cu based amorphous coating was found to be three times higher than that of pure Cu coating. The 3-point bending test results showed that the adhesion strength of Cu based amorphous coating layer was higher than that pure Cu coating. It was also observed that hard Cu base amorphous particle could easily deform soft substrate by particle collisions and thus generated strong adhesion between coating and substrate. However, the amorphous coating layer unexpectedly represented lower corrosion resistance than pure Cu coating, which might be resulted from the higher content of porosity in the cold sprayed amorphous coating.

Keywords

Acknowledgement

Supported by : 산업자원부

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