Journal ArticleDOI
Microstructural development during the liquid-phase sintering of cemented carbides
R. Warren,M. B. Waldron +1 more
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In this paper, the authors show that the carbide contiguity in a given alloy develops towards an equilibrium value, which is directly related to the dihedral angle between carbide grains and therefore to the relative values of the interfacial energy and the contiguous boundary energy.Abstract:
Measurements have been made of the contiguity, the dihedral angle, and the continuity of the carbide phase in alloys of a number of transition-metal carbides with cobalt, which were prepared by liquid-phase sintering. During sintering, the carbide contiguity in a given alloy develops towards an equilibrium value, which is directly related to the dihedral angle between carbide grains and therefore to the relative values of the interfacial energy and the contiguous boundary energy. A direct relationship between the contiguity and the angle of contact of the liquid on the carbide, however, does not exist. The contiguity at the start of sintering depends to some extent on the history of the specimen before liquid-phase sintering and in most cases is higher than the equilibrium value. Observations were made which indicate that the carbide grains in the majority of cemented carbides exist as a continuous skeleton. Arguments are presented to show that neither the presence of such a skeleton nor the prese...read more
Citations
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Journal ArticleDOI
Review: liquid phase sintering
TL;DR: A review of the literature on liquid phase sintering can be found in this paper, with a focus on the densification and microstructure evolution events of a mixture of powders.
Journal ArticleDOI
Physical and chemical nature of cemented carbides
TL;DR: In this article, the physical and chemical aspects of transition metal carbides and iron-group metals are reviewed with emphasis on the materials science point of view focusing on those compositions which have gained technical interest.
Journal ArticleDOI
Abnormal growth of faceted (WC) grains in a (Co) liquid matrix
TL;DR: In this paper, it was shown that the abnormal grain growth (AGG) behavior is not linearly dependent on the driving force arising from the grain size difference, but the growth rate is expected to increase abruptly at a critical supersaturation.
Journal ArticleDOI
Coarsening in Sintering: Grain Shape Distribution, Grain Size Distribution, and Grain Growth Kinetics in Solid-Pore Systems
TL;DR: Sintering occurs when packed particles are heated to a temperature where there is sufficient atomic motion to grow bonds between the particles as mentioned in this paper, and the conditions that induce sintering depend on the material, its melting temperature, particle size, and a host of processing variables.
Journal ArticleDOI
Perspectives on the source, segregation and transport of granitoid magmas
TL;DR: In this paper, a collection of three largely independent and necessarily incomplete perspectives on the origin and evolution of granitoids is presented, and the authors suggest that the most compelling evidence for diapirism appears to be the lack of tectonic transport, whereas results of physical modelling yield contradictory results.
References
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Journal ArticleDOI
The effect of volume fraction on particle coarsening: theoretical considerations
TL;DR: In this paper, the authors modified the theory of diffusion-controlled particle coarsening developed by Lifshitz and Slyozov and Wagner (LSW) to take into account the volume fraction, φ, of precipitate.
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Cermets: I, Fundamental Concepts Related to Micro‐structure and Physical Properties of Cermet Systems
TL;DR: In this paper, the microstructure of tungsten carbide and titanium carbide base cermets has been evaluated on the basis of wettability of the carbide phase.
Journal ArticleDOI
Kinetics of Coarsening of Spherical Particles in a Liquid Matrix
S. Sarian,H. W. Weart +1 more
TL;DR: The theory of particle coarsening kinetics under control by diffusion through the matrix and by phase-boundary reaction is reviewed, and extended to the case of diffusion control when the particles are closely spaced and for impurity control at the interface as mentioned in this paper.