سال انتشار: ۱۳۹۱

محل انتشار: اولین همایش بین المللی و ششمین همایش مشترک انجمن مهندسی متالورژی ایران

تعداد صفحات: ۵

نویسنده(ها):

Nader Parvin – Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Hafez Ave, Tehran, Iran
Reza Derakhshandeh Haghighi –
Mohammad Naeimi –
Reza Parastar Namin –

چکیده:

In this research, infiltration behavior of W-Ag composite compacts with Nickel and Cobalt as additives has been investigated. Nickel and Cobalt were added to Tungsten powder by two distinctmethods: mixing elementally and reduction of salt solution. The coated Tungsten powders werecompacted under controlled pressures to make porous skeleton with 32-37 vol. % porosity. Infiltration process was carried out at 1100 ̊C under a reducing atmosphere for 1h. The effect of additives on infiltration of Ag and density were evaluated by SEM and Archimedes methods. Properties of the specimens were compared following two distinct processes namely: I) sintering simultaneously with infiltration process and II) sintering prior to infiltration (pre-sintering process). It was found that specimens which were pre-sintered and then infiltrated with molten silver represent higher hardness and finer microstructure than the specimens infiltrated simultaneously with sintering