New Cermet Powders for HVOF Spraying withImproved Corrosion and Oxidation Resistance forOffshore, Mining and Power Generation Applications
Authors: Dr. Benno Gries, Dipl.-Ing. Bernhard Brüning, Dr. Stefan Zimmermann
The present study describes the development of agglomerated and sintered WC
and Cr3C2 based cermet powders with complex and highly corrosion resistant Fe
and Ni matrix alloys. In addition a Fe-Cr-C with a Ni matrix was tested as a
potential low cost alternative to standard Cr3C2-NiCr powders. The powders
were sprayed by HVOF using liquid and
gaseous fuel. Microstructure and phase
composition of the coatings were analyzed
by microscopy and X-ray diffraction.
The technical properties of the coatings
were examined by hardness measurements,
abrasive wear and cavitation
tests as well as corrosion tests. The
results were compared with state-ofthe-
art coatings of WC-Co-Cr 86/10/4
and Cr3C2-NiCr 75/25.
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