| Title |
Synthesis of Ultrafine W / Cu Composite Alloy by Mechanochemical Process |
| Authors |
이길근(Gil Geun Lee) ; 하국현(Gook Hyun Ha) ; 김병기(Byoung Kee Kim) ; 이동환(Dong Won Lee) |
| Abstract |
The possibility to obtain high density ultrafine W/Cu composite alloy with ultrafine microstructure without addition of sintering activator by chemical processing method using metallic salts as starting material is investigated in this study. Nanostructure W/Cu composite powder which is loosely agglomerated homogeneous clusters of nanoscale size W and Cu particles can be obtained by thermochemical process. Thermochemically synthesized W-/Cu-metal composite powder passed through milling process shows higher sinterability than un-milled powder. It knows that combination of thermochemical process and mechanical process was useful method to obtain high density W/Cu composite alloy with ultrafine microstructure. W-/Cu-metal composite powder reduced by the multi-step reduction process of mechanochemically synthesized W-/Cu-oxide composite powder shows higher sinterability than reduced powder by the one-step reduction process. W-20wt.%Cu composite alloy has average W particle size 1㎛ and relative density 98% can be obtained without addition of sintering activator by combination of mechanochemical process and liquid phase sintering method. |