Abstract
Mould tempering in injection moulding influences part quality as well as process efficiency. Currently established systems are either slow or require an additional process step. A thermally sprayed heating coating on the tool cavity surface enables temperature control in close proximity of the polymer melt.In this study, TiOx/Cr2O3 was used as heating coating covered with a protective coating of Al2O3. The coatings were applied by atmospheric plasma spraying using a three cathode spray gun. The heating behaviour on the surface as well as the phase stability and the thermal durability of the coating system have been investigated. Furthermore, resistance measurements of the TiOx/Cr2O3 coating at different temperatures have been conducted as a negative temperature coefficient in semiconductive materials may enable an additional utilization for precise online process monitoring.
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