Effect of Nickel and Cobalt additions on infiltration behavior, microstructure and hardness of W-Ag composites
Publish place: 1st International and 6th Joint Conference of Iranian Society of Metallurgical Engineers and the scientific community of Casting
Publish Year: 1391
Type: Conference paper
Language: English
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Document National Code:
IMES06_062
Index date: 27 January 2013
Effect of Nickel and Cobalt additions on infiltration behavior, microstructure and hardness of W-Ag composites abstract
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
Effect of Nickel and Cobalt additions on infiltration behavior, microstructure and hardness of W-Ag composites Keywords:
infiltration , W-Ag composites , powder metallurgy , mixing elementally , reduction of salt solution
Effect of Nickel and Cobalt additions on infiltration behavior, microstructure and hardness of W-Ag composites authors
Nader Parvin
Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Hafez Ave, Tehran, Iran
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