| Authors: |
Kee-Ahn Lee / School of Advanced Materials Engineering Andong National University, South Korea
Jin-Hyeon Cho / School of Advanced Materials Engineering, Andong National University, Korea
Dong-Yong Park/ Tae-Kwang Tech, Korea
Jin-Kyu Lee/ Division of Advanced Materials Engineering, Kongju National University, , Korea
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| Abstract: |
Cu54Zr22Ti18Ni6 amorphous powders were deposited onto aluminum substrates by cold spray deposition process with different powder preheating temperature (below glass transition temperature : 350¡É, near glass transition : 430¡É, and crystallization temperature : 500¡É). The microstructure and macroscopic properties of coating layers were investigated using OM, XRD, DSC and hardness, suga test, potentio-dynamic corrosion test. X-ray diffraction results showed that cold sprayed Cu based amorphous coating layers of 300~350§ thickness could be well manufactured regardless of powder preheating temperature. Porosity measurements revealed that the coating layers of 430¡É and 500¡É preheating temperature conditions had lower porosity contents (0.88%, 0.93%) than that of 350¡É preheating conditions (4.87%). Hardness was measured as 374.8 HV (350¡É), 436.3 HV (430¡É) and 455.4 HV (500¡É) for the amorphous coating layers, respectively. The results of the suga test for the wear resistance property also corresponded well to the hardness results. The critical anodic current density (ic) according to powder preheating temperature conditions of 430¡É, 500¡É were lower than that of preheated at 350¡É. The higher hardness, wear and corrosion resistance of the preheating conditions of near Tg and Tx, compared to the properties of below Tg, could be explained by the lower porosity of coating layer.
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