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Milling of thermally sprayed hardmetal coatings


Specialist Article

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, Young’s 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
Ausgabe 1 (2012) Jahrgang 5 Page 33
Ausgabe 1 (2012) Jahrgang 5 Page 34
Ausgabe 1 (2012) Jahrgang 5 Page 35
Ausgabe 1 (2012) Jahrgang 5 Page 36
Ausgabe 1 (2012) Jahrgang 5 Page 37

This article appeared in issue 1 (2012).

Issue 1 (2012) Volume 5
Thermal Spray Bulletin
Issue 1 (2012) Volume 5
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