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| Abstract No.: |
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| Title: |
Effect of heat treatment on the coating characteristics of cold sprayed Al-Sn binary alloy
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| Authors: |
Hyung-Jun Kim / RIST, Republic of Korea
Dong-Jin Jung/ RIST, Korea
Xian-Jin Ning/ RIST, Korea
Changhee Lee/ Hanyang Univ., Korea
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| Abstract: |
In this study, Al-Sn binary alloy coatings were prepared with Al-10wt.%Sn (Al-10Sn) and Al-5wt.%Sn (Al-5Sn) gas atomized alloy powders by low pressure cold spray process. The microstructure and microhardness of the as-sprayed and post-heat treated coatings were characterized. To investigate the particle bonding features of Al-10Sn powder, the wipe test was carried out on polished substrate surfaces. The average critical velocity of Al-Sn alloy powders was estimated combining with the deposition efficiency. The results proved that Al-Sn coatings with dense and uniform structure can be deposited successfully by low pressure cold spray with helium as the propellant gas. With the increase of tin content in feedstock powder, the as sprayed coatings present similar microhardness for Al-10Sn and Al-5Sn while, on the other hand, the deposition efficiency decreased. Bonding features of Al-10Sn particles indicated that the melting of tin phase occurred on the contact interface during particle impacting. This melting of tin phase may affect the particle bonding process and hence increase the critical velocity for Al-Sn binary alloy powders.
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