Influence of conductive secondary phase on thermal gradients development during Spark Plasma Sintering (SPS) of ceramic composites
(2016) Ceramics International — Vol. 42, n° 16, p. 17990-17996 (2016)
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- Authors
Delannay, Francis 
- Abstract
- Spark Plasma Sintering (SPS) has attracted a lot of interest in recent years owing to its ability to enable the densification of a broad range of materials in a very short processing time. It is well documented in the literature that the very high heating rates that can be applied with this technology can lead to the apparition of large thermal gradients in the tool and thus affect the homogeneity of the compact. In the present study, the influence of the compact thermal and electrical properties on the thermal gradients was studied. Al2O3, AIN and TiC powders were used to produce series of Al2O3-TiC and AIN-TiC composites (0, 25, 50, 75,100 vol%TiC) showing different electrical and thermal conductivities. Twopyrometers were used in order to observe and measure the thermal gradients and the percolation of the current during sintering at a high heating rate and without insulation. Electrical conductivity measurements were carried out on samples presenting different relative densities. This samples were obtained through interrupted sintering cycles at temperatures below and above the identified percolation threshold temperature. It was shown that high thermal gradients can appear during SPS depending on the processingparameters (dimensions of the die and heating rate) but also on the composition of the compact (proportion of conductive phase) and on its density.
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Citations
Demuynck, M., Erauw, J.-P., Van Der Biest, O., Delannay, F., & Cambier, F. (2016). Influence of conductive secondary phase on thermal gradients development during Spark Plasma Sintering (SPS) of ceramic composites. Ceramics International, 42(16), 17990-17996. https://doi.org/10.1016/j.ceramint.2016.07.093 (Original work published 2016)