| 1. |
- Ekbom, Lars B., et al.
(författare)
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Computer simulation of solution and growth processes during the initial stage of liquid phase sintering of tungsten heavy metal
- 2005
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Ingår i: Scandinavian journal of metallurgy. - : Wiley. - 0371-0459 .- 1600-0692. ; 34:5, s. 312-316
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Tidskriftsartikel (refereegranskat)abstract
- In the initial stage of liquid phase sintering, particle dissolution and growth processes occur. The melting matrix penetrates the solid particle agglomerates. A fraction of the particles dissolves in the liquid matrix phase and the original powder size will initially be reduced. At the same time the agglomerates of particles are effectively separated. In a second stage larger particles grow in equilibrium with the matrix, whilst smaller, pure particles dissolve into the matrix and the mean particle size increases. When an equilibrium is reached, the solid particles start to grow in the liquid matrix phase in accordance with the ripening process. The initial stages of liquid phase sintering have been investigated by short time sintering under microgravity and are presented in a series of micrographs. Mathematical models for the 3 stages have been developed. Computer simulations of these different stages in the solution and growth processes have been used to visualise the change in particle size distribution.
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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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