Milling of thermally sprayed hardmetal coatings
Authors: Dr.-Ing. Lutz-Michael Berger, Dipl.-Ing. Jörg Spatzier, Dipl.-Ing. Carsten Hochmuth, Dipl.-Ing. (FH) René Georgi
This work describes the development of finishing solutions by milling for
HVOF-sprayed WC-17Co and WC-(W,Cr)2C-7Ni coatings. The properties of
oxidation resistance, microstructure, hardness, Youngs modulus and fracture
toughness differ considerably between the two coating compositions.
Polycrystalline diamond (PCD) cutting tools proved to be the most favourable
for milling. The parameters could be optimised to achieve cost-efficient milling
of the WC-17Co coatings with an appropriate PCD cutting tool grade. In the
case of the WC-(W,Cr)2C-Ni composition a significantly lower machining tool
lifetime was reached due to the differences in the properties of the two
hardmetal coating compositions.
Pages: 33 - 37
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