A feasibility study of W-Cu composites production by high pressure compression of tungsten powder

Synthesis, structure and mechanical properties of ice-templated tungsten foams

“…Such applications include tungsten scaffolds for biomedical implant 49 or lightweight, lead-free radiation shielding, 50 as well as foams which are subsequently melt-infiltrated with copper to create W-Cu composites for electrical contact materials. [4][5][6] In all the above cases, directional pores are beneficial due to the enhanced strength in the direction of the aligned walls. Such composites may also be used for heat spreaders in power electronics 6 due to their unusual combination of low thermal expansion and high thermal conductivity, which is expected to be anisotropic due to highly aligned W wall microstructure providing another level of customization.…”

“…1 In particular, porous tungsten oxide is used for a variety of energy and photo-therapeutic usages. 2 Foams are additionally widely used as scaffolds for metal-metal-and ceramic-metalcomposites produced by melt-infiltration, [3][4][5] important examples of which include W-Cu and W-Ag composites for arcing contacts in switchgears, 4-6 W-Cu for resistance welding electrodes, 6 low coefficient of thermal expansion substrates for heat spreader in power electronics 6 and electrodes for electrical discharge machining. 6,7 Common foam synthesis methods 8,9 including traditional powder metallurgy (PM) approaches 3,10,11 lead to equiaxed pores with an isotropic distribution over the whole foam.…”

Characterization of fine-grained W–10wt.% Cu composite fabricated by hot-shock consolidation

“…Novel sintering techniques have been explored to improve W-Cu composite densifications, which includes plasma spraying [9], laser sintering [10], microwave sintering [8,11,12] and powder injection molding [13]; but the deterioration due to high sintering temperature and long processing time is still not overcome. Then methods utilizing ultra-high pressure are developed to fabricate W-Cu composites, such as Hot-pressing method [14] and resistance sintering [15,16], which apparently lower sintering temperature and shorten sintering time. Resistance sintering is considered as a promising method for the fabrication of metals with a fine-grain microstructure.…”

Structural, Microstructral, Mechanical and Magnetic Characterization of Ball Milled Tungsten Heavy Alloys

“…At sintering temperature 1200˚C, the tungsten heavy alloys are formed for powders milled at 100 hrs and above as a result of fine, smaller and homogenous powders, moreover the benefit of the high pressure [26]; Figure 12. In the case of unmilled and 50 hrs milled powders, the individual elemental peaks (Ni, Fe) for 90W-7Ni-3Fe were still vivid indicating that no solid solution was formed, Figure 13.…”