발간논문

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Vol.30, No.9, 1078 ~ 1087, 1992
Title
The Manufacturing of Dispersion Strengthened Cu - W Sintered alloy By mechanical Alloying
이재성Jai Sung Lee, 한정준Jung Jun Han
Abstract
An investigation has been performed on the manufacturing of dispersion strengthened Cu5vol.% W materials for resistance welding electrodes and contact tips in gas-metal arc welding guns by mechanical alloying. Composite Cu-5 vol. % W powders were produced by high energy ball milling of Cu and W powders in an attritor in argon atmosphere for various milling times, 2, 8, 16, and 24 hrs. The green compacts were sintered at 1000℃ in a flowing hydrogen atmosphere for 2 hrs. The experimental results of powder characteristics revealed that during mechanical alloying of Cu-W powders the particle size was decreased and the shape changed from dendritic- to irregular- and finally to flaky type and also the W particles were uniformly distributed within the Cu matrix. The densification and the properties of the Cu-5 % W composites were closely related to the powder characteristics and discussed in terms of microstructural development.
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