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| 2. |
- Antonsson, Tomas, et al.
(författare)
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Liquid Ni-Fe penetration and recrystallisation in tungsten
- 2003
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Ingår i: International journal of refractory metals & hard materials. - 0263-4368. ; 21:3-4, s. 159-170
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Tidskriftsartikel (refereegranskat)abstract
- Melt penetration in grain boundaries of solid tungsten has been investigated. Solid tungsten rods have been exposed to a nickel-iron melt saturated with tungsten and the penetration depth and the shape of the liquid channels have been examined. The solid tungsten samples have been treated in different ways like cold working, annealing and recrystallisation, before melt exposure. Important parameters for the penetration process are stresses, surface tensions, solution and kinetic effects. A new theoretical model for the penetration mechanism in cold worked samples is proposed. Rapid recovery of the grains in the penetrated areas of the cold worked samples was observed. This is discussed, as well.
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| 3. |
- Ekbom, Lars B, et al.
(författare)
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Liquid Phase Sintering of Tungsten Composites
- 1994
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Ingår i: Conference proceedings of the Sefström Symposium. - Stockholm : KTH. - 9171707891 ; , s. 293-304
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 10. |
- Eliasson, Anders, et al.
(författare)
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Tungsten grain separation during initial stage of liquid phase sintering
- 2008
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Ingår i: Powder Metallurgy. - : Informa UK Limited. - 0032-5899 .- 1743-2901. ; 51:4, s. 343-349
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Tidskriftsartikel (refereegranskat)abstract
- The initial stage, the first few seconds of liquid phase sintering has been investigated in experiments using a tungsten heavy alloy with low tungsten content. The heavy alloy has been melted in a temperature gradient for short periods, similar to 9 s in an ellipsoid mirror furnace. During the liquid phase sintering at about 1470 degrees C, a penetration followed by a remarkably rapid separation and dispersion of the tungsten grains by the molten matrix occur. The suggested explanation for this grain separation and dispersion is based on the effect of composition gradients in the liquid matrix and a theory based on interagglomerate melt swelling due to a Kirkendall effect.
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