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Effect of Electrolyte Compositions on the Physical Property and Surface Morphology of Copper Foil
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| 우태규 Tae Gyu Woo , 박일송 Il Song Park , 전우용 Woo Yong Jeon , 박은광 Eun Kwang Park , 정광희 Kwang Hee Jung , 이현우 Hyun Woo Lee , 이만형 Man Hyung Lee , 설경원 Kyeong Won Seo |
| KJMM 48(10) 951-956, 2010 |
ABSTRACT
This study examined the effect of copper and sulfuric acid concentrations on the surface morphology and physical properties of copper plated on a polyimide (PI) film. Electrochemical experiments with SEM and a four-point probe were performed to characterize the morphology and mechanical characteristics of copper electrodeposited in the composition of an electrolyte. The resistivity and peel strength were controlled using a range of electrolyte compositions. A lower resistivity and high flexibility were obtained when an electrolyte with 20 g/l of copper was used. However, a uniform surface was obtained when a high current density that exceeded 20 mA/cm² was applied, which was maintained at copper concentrations exceeding 40 g/l. Increasing sulfuric acid to >150 g/l decreased the peel strength and flexibility. The lowest resistivity and fine adhesion were detected at a Cu2+: H2SO4 ratio of 50:100 g/l.
keyword : Thin films, plating, mechanical properties, resistivity, Flexibility
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Effect of an Aging Treatment on the Interfacial Reaction and Mechanical Properties of an AS52+Sr/Al18B4O33 Magnesium Matrix Composite
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| 박용하 Yong Ha Park , 박용호 Yong Ho Park , 박익민 Ik Min Park , 조경목 Kyung Mox Cho |
| KJMM 48(10) 957-963, 2010 |
ABSTRACT
The aging behavior of aluminum borate whisker (Al18B4O33) reinforced AS52+Sr magnesium matrix composites was investigated with Vickers hardness measurements, bending tests, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Experimental results showed that aging is accelerated in the AS52+Sr/Al18B4O33 composite compared with an unreinforced AS52+Sr alloy. The hardness of the alloy and composite increases monotonically as a function of the aging time before reaching its peak hardness and then gradually decreases. The composite reaches its peak hardness in 10 h, whereas the matrix alloy requires 30h, indicating accelerated age-hardening in the AS52+Sr/Al18B4O33 composite compared with the unreinforced AS52+Sr alloy at 170℃. The interfacial reaction of AS52+Sr/Al18B4O33 magnesium matrix composite is considered to play a dominant role in the strengthening mechanism, ultimately affecting the mechanical properties of the composite.
keyword : Composites, casting, infiltration, aging, hardness test, transmission electron microscope, TEM, interfaces
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