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| Abstract No.: |
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Scheduled at:
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Thursday, May 12, 2016, Room 3C + 3D 12:20 PM
Iron-based Coatings
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| Title: |
Fe-based powder alloys deposited by HVOF and HVAF for sliding wear applications
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| Authors: |
Senad Dizdar* / Höganäs AB, Sweden
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| Abstract: |
How Fe-based powder alloys deposited by HVOF and HVAF resist abrasive and erosive wear exposed applications was presented at ITSC 2014 and 2015. This presentation focus is on sliding wear exposed applications.
HVOF and HVAF spray technologies offer a sustainable replacement for hard chrome plating. They are commonly associated with spraying of tungsten- and chrome carbide coatings which achieve high hardness, wear and corrosion resistance. However, these carbide powders are not a universal solution for all potential applications and are expensive. For some applications, the use of highly alloyed Fe-based materials can be a solution. Alloying of the powders in combination with optimisation and advanced control of the HVOF and HVAF spraying showed good results in earlier presentations.
Three Fe-based powder alloys were HVOF and HVAF sprayed on EN 355 MC steel plates. Test samples were machined from the plates with attention to remove the top sprayed layers by grinding. The samples were tested for dry sliding wear in a block-on-ring tribometric set-up according to a slightly modified and expanded ASTM G77 procedure. Test results map the sliding adhesive wear from very low to moderate sliding velocities at two load levels. Sliding velocity shows a strong influence on friction and wear.
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