Wear and Friction Behavior of NiCrBSi Coatings at Elevated Temperatures
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In many hot forming operations, the dies are subjected to high temperatures and high contact pressures. To combat wear problem, it is essential to select the accurate die material, hardness and surface coating for increasing the die life. This paper is an investigation into the use of NiCrBSi coating as a wear-resistant material on the H11 tool steel. The coating was developed by high-velocity oxy-fuel spray and atmospheric plasma spray process. In-depth characterization of the as-sprayed specimens was done by field emission-scanning electron microscopy/energy-dispersive spectroscopy and x-ray diffraction techniques. The mechanical and physical properties of the as-sprayed coatings were measured. Thereafter, the tribological performances of the uncoated and coated specimens were studied on high-temperature pin-on-disk tribometer under two different loads and temperatures ranging from room temperature to 800 °C. Wear mechanisms were mainly oxidative and adhesive at 400 °C and a combination of oxidative wear, abrasive wear and adhesive wear at 800 °C for the HVOF-sprayed and the APS-coated specimens.
Keywordsatmospheric plasma spray friction hot forming steels HVOF spray NiCrBSi wear
Manpreet Kaur et al. thankfully acknowledge the research grant from Department of Science and Technology, New Delhi (India) under SERB, Science and Engineering-Engineering Scheme (File No. SR/S3/MERC/0072/2012, Dated February 28, 2013) titled “Development of Thermal Spray Coatings to Control Wear during High-Temperature Applications” and (EMR/2015/000234, Dated March 11, 2016) titled “Development of Thermal Spray Coatings to Control Wear during High-Temperature Applications-Phase II”, to carry out this research and development work. Moreover, the authors would like to thank the Metallizing Equipment Company Pvt. Ltd. Jodhpur (India), for providing The HVOF and atmospheric plasma spray coatings services for the die materials. The authors owe special thanks to Dr. Harpreet Singh for extending the necessary facilities and support in conducting the detailed analysis at Indian Institute of Technology Ropar, Roopnagar, Punjab, and Dr. S. Parkash at Indian Institute of Technology Roorkee, Roorkee. The authors would also like to thank IKGPTU, Jalandhar, India, for supporting this work.
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