Abstract No.:
5348

 Scheduled at:
Friday, June 09, 2017, Hall 14 11:40 AM
Electronics & Sensoric


 Title:
Demonstrating usability of thermally sprayed coatings for mechatronics and power electronics applications

 Authors:
Jan Luth* / obz innovation gmbh, Germany
Richard Trache / Technische Universität Dresden, Germany
Filofteia-Laura Toma/ Fraunhofer IWS, Germany
Sven Hartmann/ obz innovation GmbH, Germany
Fabian Trenkle/ obz innovation gmbh, Germany

 Abstract:
Nowadays, electronic components are substantial for modern technology. This field of technology is one of the key sections of engineering advancement. Even in conventionally powered vehicles extensive power electronic and mechatronic system devices are currently in development or already state of the art. For these applications insulating coatings with applied highly conducting paths become more and more important
In this study two- and tree-dimensional demonstrators were developed, showing the flexible use of thermal spraying in mechatronics and power electronics. For these demonstrators, a combination of HVOF and cold gas spraying was used to create multilayer-coating systems consisting of conducting and insulating coatings. SMD components, such as resistance elements and LEDs, were soldered on top to show a proof of concept of such devices. In contrast to past studies on this construction concept, the main focus of this study was on the optimization of the ceramic insulting coatings and bond strength of the metallization. Ceramic coatings from alumina with different levels of impurities and addition of titania and magnesia were studied regarding there electrical resistance and dielectric strength.
The ceramic coatings showed a dielectric strength and electrical resistance, which was suitable for most environments. Additional sealing improved the electrical resistance in humid conditions. This sealing was compatible with the SMD components and could hence be also applied on the demonstrator. For best thermal conductivity, the electric insulation layer has to be as thin as possible. Already 150 µm thick electrical insulation layers showed a breakdown voltage of more than 5 kV AC and a specific electrical resistance of 5.1011 &.m at a relative humidity of 43%. After 50 cycles between 20 ° C and 200 ° C no change in the coating structure could be detected. Also no influence on the dielectric strength was evident.


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