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Open AccessArticle

Tribological Characterization of Micron-/Nano-Sized WC-9%Co Cemented Carbides Prepared by Spark Plasma Sintering at Elevated Temperatures

1
Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
2
Department of Mechanical and Nuclear Engineering, University of Sharjah, Sharjah 27272, UAE
3
Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
4
Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
*
Author to whom correspondence should be addressed.
Materials 2019, 12(6), 920; https://doi.org/10.3390/ma12060920
Received: 12 January 2019 / Revised: 3 March 2019 / Accepted: 4 March 2019 / Published: 20 March 2019
The present study investigates the high temperature tribological performance of spark plasma sintered, nano- and micron-sized tungsten carbide (WC) bonded by 9 wt.% cobalt (Co). The composites were fabricated using a two-step procedure of mixing followed by spark plasma sintering (SPS). Ball-on-disc wear tests were conducted at a normal load of 30 N, linear speed of 0.1 m/s under dry conditions and at three different temperatures (room temperature, 300 °C and 600 °C). Field emission scanning electron microscopy (FESEM), optical profilometry and energy dispersive X-ray (EDS) spectroscopy were used to analyze the surface morphology and the wear track area. At room temperature, it was observed that the nano-sized WC composites exhibited better wear resistance than the micron-sized WC composites. The wear resistance of the nano-sized samples declined significantly relative to that of the micron-sized samples with an increase in temperature. This decline in performance was attributed to the higher surface area of nano-sized WC particles, which underwent rapid oxidation at elevated temperatures, resulting in poor wear resistance. The wear rate observed at 600 °C for the micron-sized WC composites was 75% lower than that of the nano-sized cemented carbide. Oxidative wear was observed to be the predominant wear mechanism for both cemented carbide samples at elevated temperatures. View Full-Text
Keywords: tungsten carbide-cobalt; cemented carbide; powder processing; spark plasma sintering; nanomaterials; wear; elevated temperature tungsten carbide-cobalt; cemented carbide; powder processing; spark plasma sintering; nanomaterials; wear; elevated temperature
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MDPI and ACS Style

Wohaibi, S.A.; Mohammed, A.S.; Laoui, T.; Hakeem, A.S.; Adesina, A.Y.; Patel, F. Tribological Characterization of Micron-/Nano-Sized WC-9%Co Cemented Carbides Prepared by Spark Plasma Sintering at Elevated Temperatures. Materials 2019, 12, 920. https://doi.org/10.3390/ma12060920

AMA Style

Wohaibi SA, Mohammed AS, Laoui T, Hakeem AS, Adesina AY, Patel F. Tribological Characterization of Micron-/Nano-Sized WC-9%Co Cemented Carbides Prepared by Spark Plasma Sintering at Elevated Temperatures. Materials. 2019; 12(6):920. https://doi.org/10.3390/ma12060920

Chicago/Turabian Style

Wohaibi, Saleh A.; Mohammed, Abdul S.; Laoui, Tahar; Hakeem, Abbas S.; Adesina, Akeem Y.; Patel, Faheemuddin. 2019. "Tribological Characterization of Micron-/Nano-Sized WC-9%Co Cemented Carbides Prepared by Spark Plasma Sintering at Elevated Temperatures" Materials 12, no. 6: 920. https://doi.org/10.3390/ma12060920

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