Poongsan Corporation

Poonsgan Corporation

Bo Min Jeon

Dae Hyun Kim

Sang Young Choi

Dong Woo Lee

In Dal Kim

Ji Hoon Lee

Won Shin Kwak

Won Seok Jeong

Disclosed is a high-strength free-cutting leadless copper alloy with excellent machinability and corrosion-resistance. The free-cutting leadless copper alloy contains 58 to 70 wt % of copper (Cu), 0.5 to 2.0 wt % of tin (Sn), 0.1 to 2.0 wt % of silicon (Si), a balance amount of zinc (Zn), and inevitable impurities but does not contain lead.

Free-cutting leadless copper alloy with no lead and bismuth

The present invention relates to a method of manufacturing a high purity copper (Cu) powder material useable in fabricating a sputtering target material for electronic industrial applications, for example a penetrator liner. The foregoing method has a configuration of using an apparatus composed of a raw material feeder, a plasma torch and a reactor to prepare a metal powder, and includes steps of passing a Cu powder having an average particle diameter of 30 to 450 &#x3bc;m through the thermal plasma torch at an introduction rate of 2 to 30 kg/hr, to thereby fabricate a Cu powder having an average particle diameter of 5 to 300 &#x3bc;m.

Production method for high purity copper powder using a thermal plasma

A copper alloy includes Si to facilitate deoxidation, and can be easily manufactured even when including elements such as Cr or Sn. The copper alloy has high conductivity and high workability without negatively affecting the tensile strength. The copper alloy contains 0.2 to 0.4 wt % of Cr, 0.05 to 0.15 wt % of Sn, 0.05 to 0.15 wt % of Zn, 0.01 to 0.30 wt % of Mg, 0.03 to 0.07 wt % of Si, with the remainder being Cu and inevitable impurities. A method for manufacturing the copper alloy includes obtaining a molten metal having the described composition; obtaining an ingot; heating the ingot at a temperature of 900-1000&#xb0; C. to perform a hot rolling process; cold rolling; performing a first aging process at a temperature of 400-500&#xb0; C. for 2 to 8 hours; cold rolling; and performing a second aging process at a temperature of 370-450&#xb0; C. for 2 to 8 hours.

Copper alloy with high strength and high conductibility, and method for manufacturing same

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Ulsan-si, South Korea

Bo Min Jeon