Abstract
Current-activated tip-based sintering (CATS) is a novel process where spark plasma sintering conditions are applied through an electrically conducting tip on a locally controlled area on a green powder compact/bed. The localization of electric current in CATS allows for unique temporal and spatial current and temperature distributions within the tip and powder compact. In this paper, special experimental setups were used to monitor the temperature profiles in the tip and at multiple locations on the surface of nickel powder compacts. A variation in the initial green density was found to have a significant effect on the maximum temperature in the tip as well as the temperature distribution across the powder compact. In general, the lowest green density specimens displayed the best conditions for localized densification. The concept of effective current density is introduced and results are discussed in relation to the densification parameter.
Highlights
Despite the intense research and interest in spark plasma sintering (SPS) as a fast powder consolidation process, other methods have emerged combining the effect of electric current withMetals 2013, 3 plastic deformation such as electric rolling of powders [1,2] and spark plasma extrusion [3,4]
Current-activated tip-based sintering (CATS) [5] developed by the authors, has provided the means to localize SPS conditions, and open the door to multi-scale processing of 1D, 2D and current-activated tip-based sintering (CATS) is a new process in which an electric current is allowed to pass through a small conducting tip to a powder compact/bed enforcing SPS conditions on a locally controlled area depending on the size and shape of the tip
The following conclusions can be drawn from the present study: 1. Green compact temperature profiles were successfully generated for the first time in current-activated tip-based sintering under continuous DC current exposure
Summary
Despite the intense research and interest in spark plasma sintering (SPS) as a fast powder consolidation process, other methods have emerged combining the effect of electric current with. Current-activated tip-based sintering (CATS) [5] developed by the authors, has provided the means to localize SPS conditions, and open the door to multi-scale processing of 1D, 2D and. CATS is a new process in which an electric current is allowed to pass through a small conducting tip (that could be stationary or moving) to a powder compact/bed enforcing SPS conditions on a locally controlled area depending on the size and shape of the tip. Due to the potentially small tip sizes used in CATS, it can be extremely difficult to obtain temperature measurements through conventional routes such as those used in SPS. The concept of effective current density is introduced and the densification parameter was used to explain results for specimens of varying green densities (with different starting resistivity values) that undergo CATS
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