Influence of conductive secondary phase on thermal gradients development during Spark Plasma Sintering (SPS) of ceramic composites |
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| Affiliation: | 1. Belgian Ceramic Research Centre (Member of EMRA), Avenue Gouverneur Cornez 4, Mons, B-7000 Belgium;2. MTM KULeuven, Kasteelpark Arenberg 44, Leuven, B-3001 Belgium;3. EMPA UCLouvain, Place Sainte Barbe 2, Louvain-la-Neuve, B-1348 Belgium;1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;2. Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China;1. Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran;2. Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran;1. Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001 Kirrawee DC, NSW 2232, Australia;2. Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA 6009, Australia |
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| 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, AlN and TiC powders were used to produce series of Al2O3-TiC and AlN-TiC composites (0, 25, 50, 75, 100 vol%TiC) showing different electrical and thermal conductivities. Two pyrometers 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 processing parameters (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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| Keywords: | Spark Plasma Sintering (SPS) Sintering (A) Electrical conductivity (C) Thermal conductivity (C) AlN-TiC |
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