Theory of liquid-phase sintering: Model experiments on the tungsten-nickel-copper heavy-alloy system
In most industrially important liquid-phase-sintering systems, like cemented carbides and tungsten heavy alloys, there is considerable deviation from theory. This deviation from classic behavior is related to heating rate, intersolubility of the base in the additive, and initial additive homogeneity. Thus, inclusion of these features into an updated liquid-phase-sintering theory provides better prediction of densification and microstructural coarsening. A computer model of liquid-phase sintering was developed; the factors included in this model are heating rate, particle size, solubility, and additive homogeneity. Coupled with this computer simulation were experimental observations using the tungsten-nickel-copper system. This system provides a spectrum of solubilities representative of common liquid-phase sintering systems. The experiments were designed to illustrate the shortcomings of previous theories of liquid-phase sintering, and to verify the predictions of the theoretical model developed. Results show that the departure from classic theory increases with slow heating rate, high solubility of the base in the additive, and high initial additive homogeneity.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (USA)
- OSTI ID:
- 5182606
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Phase equilibria effects on the enhanced liquid phase sintering of tungsten-copper
Theory of liquid-phase sintering: model experiments on W-Ni-Fe heavy alloy system