Scratch Resistance of High Velocity Oxy-Fuel Sprayed WC-20% Co Coatings Reinforced with Carbon Nanotubes

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Authors

  • School of Mechanical Engineering, Vellore Institute of Technology, Vellore - 632014, Tamil Nadu ,IN
  • School of Mechanical Engineering, Vellore Institute of Technology, Vellore - 632014, Tamil Nadu ,IN

DOI:

https://doi.org/10.18311/jsst/2020/24184

Keywords:

Carbon Nano-Tubes (CNTs), CNT Bridging, High Velocity Oxy-Fuel (HVOF) Process, Porosity Analysis, Scratch Track

Abstract

Tungsten Carbide-20 weight % Cobalt (WC-20 wt% Co) coatings were extensively used material to achieve a combination of extreme hardness and excellent strength. Hence, an effort has been made to improve the toughening properties of WC-Co coatings through reinforcement of Carbon Nano-Tubes (CNTs) using High-Velocity Oxy-Fuel (HVOF) spraying process. In this work, 2 wt%, 4 wt%, and 6 wt% of CNTs were blended by the ball milling process with WC-Co powders. These composed powders were deposited by HVOF process on to the plain mild steel substrates. The scratch test analysis on as-sprayed coatings showed that due to the addition of CNTs on WC-Co coatings, the resistance to penetrate the coating surface increased. Also, by varying the percentage of CNTs in the coating system, the pores were reduced. This phenomenon is attributed to the toughening mechanism by forming a CNT bridge which avoids the formation of internal cracks.

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Published

2020-08-20

How to Cite

Mohammed Thalib Basha, G., & Venkateshwarlu, B. (2020). Scratch Resistance of High Velocity Oxy-Fuel Sprayed WC-20% Co Coatings Reinforced with Carbon Nanotubes. Journal of Surface Science and Technology, 36(1-2), 67–73. https://doi.org/10.18311/jsst/2020/24184

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Articles
Received 2019-09-06
Accepted 2020-06-15
Published 2020-08-20

 

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