IGF research project "OptiGrain“ successfully completed
The aim of the completed research project IGF – 20.588 BR was the „optimisation of the carbide grain size in WC-Co(Cr) coatings to increase the wear resistance with simultaneous corrosive stress“. The result of the project with the short title „OptiGrain“ is the adaptation of the established WC-10Co4Cr coatings to changed requirement profiles compared to the time of their development.
In particular, there is a need for optimisation with regard to increasing wear resistance to erosion and cavitation through an adapted WC grain size with simultaneously improved toughness and high corrosion resistance, as important areas of application lie in the field of hydraulic machine parts through which liquids flow or flow against them. The Cr3C2 content plays the decisive role here; a reduction compared to the standard composition was evaluated by means of preliminary development with sintered bodies and experimental coating powders. The processing of these and other commercially available coating powders with representative structures was carried out using a liquid-fuelled HVOF system. This publication describes partial results of the material development and selected coating properties. A new test method (ErKaV) is presented, which makes it possible to make a statement about the tribological properties of the coatings under the influence of a highly erosive and cavitative wear regime in a very short time (see figure).
The IGF project no.: 20.588 BR / DVS no.: 02.3179 of the Forschungsvereinigung Schweißen und verwandte Verfahren e.V. of the DVS, Aachener Str. 172, 40223 Düsseldorf, was funded via the AiF within the framework of the programme for the promotion of joint industrial research (IGF) by the Federal Ministry of Economics and Climate Protection on the basis of a resolution of the German Bundestag.
The final report on the project can be found at the following link:
https://www.tu-chemnitz.de/mb/WOT/forschung/forschungsprojekte/aif_bmbf_sab/IGF_20588.pdf
Questions about the research project will be answered by gerd.paczkowski@tu-chemnitz.de or to lutz-michael.berger@ikts.fraunhofer.de .
Picture:
(a) TUC water jet cutting system; (b) triangular matrix for statistical testing of the layers; (c) wear trough with material elevation at the stagnation point of the flow; (d) laser scanning microscope for quantification of the erosion cavitation troughs; (e) digital image of the wear trough of the WCCo22 layer and f); the WCCo21 layer
9.3.2022 – Projects of the professorship ( thomas.grund@mb… )
