|
Vol.46, No.5, 321 ~ 328, 2008
|
| Title |
| Fabrication and Characterization of Cu-based Amorphous Coatings by Cold Spray Process |
| 정동진 Dong Jin Jung , 박동용 Dong Yong Park , 이진규 Jin Kyu Lee , 김형준 Hyung Jun Kim , 이기안 Kee Ahn Lee |
|
|
|
| Abstract |
| Cu based amorphous (Cu54Zr22Ti18Ni6) 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 (300~400 μm thickness) contained 4.87% porosity. The hardness of Cu based amorphous coating represented 412.8 Hv, 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. |
|
|
| Key Words |
| Cu based bulk amorphous, cold spraying, amorphous coating, porosity, micro-hardness, were resistance, adhesion, corrosion resistance |
|
|
 |
|
