Influence of BIAS voltage and pulse time on the active-filler conversion of Polymer derived Ceramic coatings processed by Plasma Assisted Pyrolysis.

Reference	Presenter	Authors (Institution)	Abstract
18-011	Daniel Auri Schaefer	Schaefer, D.A.(Federal University of Santa Catarina); Leite, M.L.(Universität Bayreuth); Seifert, M.(Universität Bayreuth); Martins, N.(Federal University of Santa Catarina); Klein, A.N.(Federal University of Santa Catarina); Motz, G.(Universität Bayreuth);	The Plasma Assisted Pyrolysis (PAP) process is a new technology for the development of ceramic composites based on Polymer Derived Ceramics (PDC) with an increased active-filler conversion. In this study, the influence of the applied BIAS voltage and pulse time of the DC plasma on active-filler conversion was investigated. Hence, ceramic coatings containing HTTS polyorganosilazane and TiB2 powder as active-filler were deposited onto sintered steel substrates. Pyrolysis was carried out by PAP in cathode configuration, at 1000 °C and 2 h holding time. The BIAS voltage was varied in the range from 400 to 600 V and the pulse time between 70 and 130 µs. The resulting coatings were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) combined with Rietveld refinement. The best active-filler conversion was obtained by the setting the BIAS voltage to 500 V and the pulse time to 130 µs, although the influence of the BIAS voltage is almost negligible in the process.
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