"Microstructure and properties of HVOF-sprayed
WC-(W,Cr)2c-Ni coatings".
by Berger, Lutz-Michael^Saaro, Sabine^Naumann, Tobias^Kasparova,
Michaela^Zahalka, Frantisek
The composition WC-[(W,Cr).sub.2]C-Ni is one of the standard
compositions used for the preparation of thermal spray coatings using
high velocity oxygen fuel (HVOF) spraying. Surprisingly, this
composition has been poorly investigated in the past. Frequent use of
commercial designations WC-'CrC'-Ni,
WC-[Cr.sub.3][C.sub.2]-Ni, and WC-NiCr indicate the insufficient
knowledge about the phase compositions of the powders and coatings. The
properties of these coatings differ significantly from those of WC-Co
and WC-CoCr coatings. In this paper, the results of different series of
experiments conducted on HVOF-sprayed WC-[(W,Cr).sub.2] C-Ni coatings
are compiled and their specific benefits pointed out. One focus is on
analysis of the microstructures and phase com-positions of the feedstock
powders and coatings. The oxidation resistance and dry sliding wear
properties are compared with those of WC-10%Co-4%Cr coatings.
[ILLUSTRATION OMITTED]
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