Wear Resistance and Brake Performance of Brake Discs Coated with Cr3C2-25%NiCr and WC-12%Co using the HVOF method

Year 2017, Volume: 1 Issue: 3, 1 - 7, 30.12.2017

Mehmet Çakmakkaya , Mehmet Çakmakkaya

Abstract

High Velocity Oxygen Fuel
(HVOF) is one of the excellent approaches used to coat lamellar graphite cast
irons with wear-resistant Cr₃C₂-25%NiCr Chromium
Carbide-Nickel Chrome and WC-12%Co tungsten carbide with good qualities. In
this research, -45 +5 μm Cr₃C₂-25%NiCr and WC-12%Co
sintered powder is used to coat the surfaces of the brake discs, which are made
of lamellar graphite cast iron, that contact with the pads.  Performance of the discs, which are covered
with these powders, in terms of wear and braking characteristics are studied.
The microstructure of the Cr₃C₂-25%NiCr and WC-12%Co
coating, which is applied by using the HVOF spraying method, is characterized
at each step by scanning with electron microscopy. Braking performance and
coated surface wear testing is performed with SAE J2430, TS 555 and TS 9076
brake-on-disk tester. Wear mass loss values are examined by applying different
loads at the sliding distance. Test results show that the amount of wear of the
coated sample is reduced in comparison to the uncoated sample. As a result of
this study, the effects on the microstructure, mechanical properties and abrasive
wear behaviour of coatings deposited by using the Cr₃C₂-25%NiCr
and WC-12%Co powder and an ethane-fuelled, high-velocity oxygen-fuel spray
process are revealed.

Keywords

Wear, HVOF, braking

References

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