Comparison between Ni-Cr-40vol%TiC wear-resistant plasma sprayed coatings produced from self-propagating high-temperature synthesis and plasma densified powders |
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| Authors: | C Bartuli R W Smith |
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| Affiliation: | (1) Department of ICMMPM, University “La Sapienza”, Rome, Italy;(2) Center for Plasma Processing of Mate-rials, Department of Materials Engineering, Drexel University, Phila-delphia, PA, USA |
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| Abstract: | Plasma sprayed Ni-Cr-40vol%TiC coatings produced from powders obtained by self-propagating hightemperature synthesis (SHS)
and plasma densification (PD) processes are characterized. Chemical composition, microstructure, and mechanical properties,
such as microhardness and wear resistance, are evaluated and compared. SHS coatings exhibit good sliding wear performance.
The exact stoichiometry of titanium carbide inclusions in the metallic matrix affects the dimension of the crystal lattice
parameter and was investigated by examining the shift of x-ray diffraction (XRD) peaks of the TiC. A value of the combined
carbon/titanium ratio of about 0.6 was calculated for both powders, thus excluding the influence of the stoichiometry of the
carbide inclusions on the wear properties of the coatings. |
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| Keywords: | Ni-Cr coatings self-propagating high-temperature synthesis (SHS) sliding wear substoichiometry titanium carbide |
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