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M. Roy, A. Pauschitz, J. Wernisch, F. Franek:
"The influence of temperature on the wear of Cr₃C₂-25(Ni20Cr) coating - comparison between nanocrystalline grains and conventional grain";
Wear, 257 (2004), 799 - 811.

The influence of temperature on the wear of Cr₃C₂-25(Ni20Cr) coating-comparison between nanocrystalline grains and conventional grains

Manish Roy a, A. Pauschitz b, J. Wernisch c and F. Franek a

a Tribology and Engineering Design Section, Institute of Micro Technique and Precision Engineering, Austria
b Austrian Center of Competence for Tribology, AC2T Research GmbH, TFZ Wiener Neustadt, Viktor Kaplan-Str. 2, A 2700, Wiener Neustadt, Austria
c Institute of Solid State Physics, Vienna University of Technology, A 1040, Vienna, Austria

Received 3 January 2003; Revised 28 April 2004; accepted 21 May 2004. Available online 28 July 2004.

Abstract
Cr_xC_y-NiCr coating is commonly used in the industry for protection against wear at elevated temperature. With an aim to investigate the friction behaviour of this layer at elevated temperature, Cr₃C₂-25(Ni20Cr) coating with nanocrystalline grains and with conventional grains are deposited on 253 MA alloy using JP-5000 high velocity oxy fuel (HVOF) system. The coating microstructure was characterised using X-ray diffraction (XRD), scanning electron microscopy and micro hardness measurements. The wear and friction behaviour of this coating against 100Cr6 steel are studied and compared for a range of temperature up to 1073 K with the help of an high temperature friction and wear rig. The mechanisms of wear are characterised using SEM. Both coatings exhibited excellent wear resistance under the test conditions. The coating with nanocrystalline grains exhibited minimum friction coefficient at 873 K whereas coating with conventional grains had minimum friction coefficient at 1073 K. This behaviour is attributed to the formation of a thick soft transfer layer on the wearing surface of the coating with nanocrystalline grains.

Author Keywords: Cr_xC_y-NiCr coating; Nanocrystalline grains; Conventional grains

http://dx.doi.org/10.1016/j.wear.2004.05.001