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, TiO_x/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 TiO_x/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.

注塑成型中的模具回火会影响零件质量以及工艺效率。当前建立的系统很慢，或者需要额外的处理步骤。在工具腔体表面上的热喷涂加热涂层可实现对聚合物熔体附近温度的控制。

在该研究中，将TiO _x / Cr ₂ O ₃用作覆盖有Al ₂ O ₃保护涂层的加热涂层。使用三阴极喷枪通过大气等离子体喷涂来施加涂层。研究了表面的加热行为以及涂层体系的相稳定性和热耐久性。此外，由于在半导体材料中的负温度系数可以实现在不同温度下TiO _x / Cr ₂ O ₃涂层的电阻测量，因此可以进一步利用它来进行精确的在线过程监控。