Comparative examination of the microstructure and high temperature oxidation performance of NiCrBSi flame sprayed and pack cementation coatings

Coatings formed from NiCrBSi powder were deposited by thermal spray and pack cementation processes on low carbon steel. The microstructure and morphology of the coatings were studied by scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD). Flame sprayed coatings exhibited high por...

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Bibliographic Details
Published in:Applied surface science 2009-01, Vol.255 (6), p.3605-3612
Main Authors: Chaliampalias, D., Vourlias, G., Pavlidou, E., Skolianos, S., Chrissafis, K., Stergioudis, G.
Format: Article
Language:English
Subjects:
CVD
High temperature oxidation
NiCrBSi
Pack cementation
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Summary:Coatings formed from NiCrBSi powder were deposited by thermal spray and pack cementation processes on low carbon steel. The microstructure and morphology of the coatings were studied by scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD). Flame sprayed coatings exhibited high porosity and were mechanically bonded to the substrate while pack cementation coatings were more compact and chemically bonded to the substrate. The microhardness and the high temperature oxidation resistance of the coated samples were evaluated by a Vickers microhardness tester and by thermogravimetric measurements (TG), respectively. Pack cementation coatings showed higher hardness and were more protective to high temperature environments than the flame sprayed coatings.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2008.10.006