NDLI: Microstructure and mechanical properties of HVOF sprayed nanocrystalline Cr$_{3}$C$

Content Provider	Springer Nature Link
Author	Roy, M. Pauschitz, A. Bernardi, J. Koch, T. Franek, F.
Copyright Year	2006
Abstract	The objectives of this work are to deposit nanocrystalline Cr$_{3}$C$_{2}$-25(Ni20Cr) powder by thermal spraying and to compare the performance of this coating with that obtained using conventional powder. Towards that purpose, Cr$_{3}$C$_{2}$-25(Ni20Cr) powders with nanocrystalline grain size and with conventional grain size were deposited using OSU-SJS high-velocity oxyfuel (HVOF) system. The microstructural features, such as morphology of the coated surface, thickness of the coating, the interface of the coating with the substrate, distribution of various phases, and grain sizes etc, were characterized with the help of optical microscope, scanning electron microscope (SEM), and transmission electron microscope (TEM). The amount of oxide phases and pores were determined by means of image analyzer. The presence of various phases was identified by x-ray diffraction (XRD) technique. Hardness, elastic modulus, and indentation toughness were evaluated employing micro indentation technique. The results indicate the presence of three different zones containing only orthorhombic Cr$_{3}$C$_{2}$ phase, FCC NiCr phase, and mixture of Cr$_{3}$C$_{2}$ and NiCr phases in, both coatings. The grain sizes in the nanocrystalline coating were in the range of 80 to 100 nm. Nanocrystalline coating exhibits 20% increase in hardness, 40% decrease in surface roughness, and comparable fracture toughness and elastic modulus with respect to conventional coating.
Starting Page	372
Ending Page	381
Page Count	10
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	15
Issue Number	3
e-ISSN	15441016
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	coatings for engine components high-velocity oxyfuel (HVOF) coatings HVOF spray parameters nanocrystalline coatings nanocrystalline materials properties of coatings Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Materials Science Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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