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Characterisation of SiCN Coatings on Substrates of Hf and Nb
C. Delpero, W. Krenkel, G. Motz
University of Bayreuth, Ceramic Materials Engineering (CME), D-95440 Bayreuth, Germany
received October 1, 2012, received in revised form November 23, 2012, accepted January 21, 2013
Vol. 4, No. 2, Pages 105-112 DOI: 10.4416/JCST2012-00041
Abstract
Refractory metals like Hf and Nb have high hardness and melting points above 2000 °C which make them attractive candidates for high-temperature applications. In this work it was investigated whether these metals can be used as a basis for the development of metal-ceramic composite materials. Because of the tendency of the metals to form carbide and nitride phases, a preceramic SiCN-precursor was chosen for the synthesis of the ceramic coating. During pyrolysis a functionally graded intermediate layer consisting of metal carbide and nitride is formed by reaction with the precursor elements, which also depends on the pyrolysis atmosphere used. Previous work indicates that the adhesion between the precursor-derived ceramic coating and the metal is improved if such a layer is formed 1, 2. In this work functionally graded layers were synthesised on substrates of hafnium and niobium using the polymer ABSE for the reactive precursor coating and nitrogen respectively argon as the pyrolysis atmosphere. The resulting layer systems were characterised by means of glow discharge optical emission spectroscopy, X-ray diffraction, electron microprobe analysis, scanning electron microscopy and transmission electron microscopy.
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Keywords
Precursor-derived ceramics, FGM, transition metals, composites, SiCN
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