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| Abstract No.: |
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Scheduled at:
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Tuesday, September 27, 2011, Saal C2.1 11:00 AM
Wear Protection 1
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| Title: |
Abrasive wear of flame sprayed and fused NiCrBSi alloys
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| Authors: |
Senad Dizdar* / Höganäs AB, Sweden
Lars-Åke Nilsson / Höganäs AB, GLobal Development, Sweden
Barbara Maroli/ Höganäs AB, Global Development, Sweden
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| Abstract: |
NiCrBSi alloys are often used in thermal spraying because of their good wear and corrosion resistance even at temperatures over 500°C. Experience proved these alloys as a good choice for components function of which includes own or surrounding media movements in presence of hard particles. The main wear mechanism here is abrasive wear by hard particles. Some examples are wear plates exposed to impact sliding; extruders, screw conveyors or mixer parts exposed to grooving; fans, rotor wheel blades or impellors transporting sand/granular material at temperature over 500°C; or pump parts exposed to fluid containing sand. Besides such wide usage of NiCrBSi alloys in thermal spraying, their abrasive wear resistance is still not understood.
To get some more understanding, a handful of sprayed and fused NiCrBSi coatings with hardness from 40 to 60 HRC were tested for abrasive wear according to ASTM G6504 norm. Fractographic and metallographic analysis of worn tracks were done in order to put more light on how microstructure and hardness of the NiCrBSi coatings influence abrasive wear mechanisms. These results are compared to results published previously.
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