Z. Liu , T. Chen , Y. Yang , T. Song , W.S. Cai , H.B. Ke , W.H. Wang , C. Yang
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A new method for determining activation energy in spark plasma sintering
In general, the power-law creep is used to calculate the activation energy in hot press powder sintering. However, associated difficulty is caused by its large amount of exploratory experiments and multiple creep mechanisms of metal powder with holding time at specific temperatures and macroscopic pressures. In the present study, we propose a new method combining the stress-temperature map of metals and the power-law creep equations, that allows for a faster determination of the creep temperature interval of metals, and finally an accurate determination of the creep mechanism in powder sintering. We verified the viability of this method by varying the pulse current frequency during spark plasma sintering of pure titanium powder. It is also concluded that the higher pulse current frequency is able to reduce the activation energy of pure titanium powder. Accordingly, the results obtained provides a labor-saving method to determine the activation energy of metals in powder sintering.
期刊介绍：
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.
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