Tribological Behaviour of Plasma-Sprayed Graphene Nanoplatelets Reinforced Hydroxyapatite Nanocomposite Coating

2021 ◽  
Author(s):  
Swarnima Singh ◽  
Swati Sharma ◽  
Anup Kumar Keshri
Keyword(s):  
Nanocomposite Coating ◽  
Graphene Nanoplatelets ◽  
Tribological Behaviour ◽  
Plasma Sprayed

Role of the Hybrid Addition of Carbon Nanotubes and Graphene Nanoplatelets on the Corrosion Behavior of Plasma‐Sprayed Aluminum Oxide Nanocomposite Coating

2020 ◽  
Vol 22 (3) ◽  
pp. 1900763 ◽  
Author(s):  
Krishna Kant Pandey ◽  
Aminul Islam ◽  
Rakesh Kumar ◽  
Rahul Ghosh ◽  
Venugopal Arjunan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aluminum Oxide ◽  
Corrosion Behavior ◽  
Nanocomposite Coating ◽  
Graphene Nanoplatelets ◽  
Plasma Sprayed

scholarly journals Enhancing Graphene Retention and Electrical Conductivity of Plasma-Sprayed Alumina/Graphene Nanoplatelets Coating by Powder Heat Treatment

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 643
Author(s):  
Xiaoyu Wu ◽  
Shufeng Xie ◽  
Kangwei Xu ◽  
Lei Huang ◽  
Daling Wei ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Structural Integrity ◽  
Ceramic Coatings ◽  
Treatment Temperature ◽  
Graphene Nanoplatelets ◽  
Structural Defects ◽  
Temperature Plasma ◽  
Heat Treated ◽  
Plasma Sprayed

Burning loss of graphene in the high-temperature plasma-spraying process is a critical issue, significantly limiting the remarkable performance improvement in graphene reinforced ceramic coatings. Here, we reported an effective approach to enhance the graphene retention, and thus improve the performance of plasma-sprayed alumina/graphene nanoplatelets (Al2O3/GNPs) coatings by heat treatment of agglomerated Al2O3/GNPs powders. The effect of powder heat treatment on the microstructure, GNPs retention, and electrical conductivity of Al2O3/GNPs coatings were systematically investigated. The results indicated that, with the increase in the powder heat treatment temperature, the plasma-sprayed Al2O3/GNPs coatings exhibited decreased porosity and improved adhesive strength. Thermogravimetric analysis and Raman spectra results indicated that increased GNPs retention from 12.9% to 28.4%, and further to 37.4%, as well as decreased structural defects, were obtained for the AG, AG850, and AG1280 coatings, respectively, which were fabricated by using AG powders without heat treatment, powders heat-treated at 850 °C, and powders heat-treated at 1280 °C. Moreover, the electrical conductivities of AG, AG850, and AG1280 coatings exhibited 3 orders, 4 orders, and 7 orders of magnitude higher than that of Al2O3 coating, respectively. Powder heat treatment is considered to increase the melting degree of agglomerated alumina particles, eventually leaving less thermal energy for GNPs to burn; thus, a high retention amount and structural integrity of GNPs and significantly enhanced electrical conductivity were achieved for the plasma-sprayed Al2O3/GNPs coatings.

scholarly journals Tribological Behaviour of Graphene Nanoplatelets as Additive in Pongamia Oil

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 732
Author(s):  
Yeoh Jun Jie Jason ◽  
Heoy Geok How ◽  
Yew Heng Teoh ◽  
Farooq Sher ◽  
Hun Guan Chuah ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Graphene Nanoplatelets ◽  
Friction Reduction ◽  
Engine Oil ◽  
Protective Film ◽  
Tribological Behaviour ◽  
Wear Reduction ◽  
Pongamia Oil ◽  
Interacting Surfaces ◽  
Worn Surface

This study investigated the tribological behaviour of Pongamia oil (PO) and 15W–40 mineral engine oil (MO) with and without the addition of graphene nanoplatelets (GNPs). The friction and wear characteristics were evaluated in four-ball anti-wear tests according to the ASTM D4172 standard. The morphology of worn surfaces and the lubrication mechanism of GNPs were investigated via SEM and EDS. This study also focuses on the tribological effect of GNP concentration at various concentrations. The addition of 0.05 wt % GNPs in PO and MO exhibits the lowest friction and wear with 17.5% and 12.24% friction reduction, respectively, and 11.96% and 5.14% wear reduction, respectively. Through SEM and EDS surface analysis, the surface enhancement on the worn surface by the polishing effect of GNPs was confirmed. The deposition of GNPs on the friction surface and the formation of a protective film prevent the interacting surfaces from rubbing, resulting in friction and wear reduction.

Tribological behaviour of plasma sprayed diamond reinforced molybdenum coatings

2019 ◽  
Vol 78 ◽  
pp. 350-359 ◽  
Author(s):  
Purnendu Das ◽  
Soumitra Paul ◽  
P.P. Bandyopadhyay
Keyword(s):  
Tribological Behaviour ◽  
Plasma Sprayed

Role of hybrid reinforcement of carbon nanotubes and graphene nanoplatelets on the electrical conductivity of plasma sprayed alumina coating

2018 ◽  
Vol 44 (4) ◽  
pp. 4508-4511 ◽  
Author(s):  
Aminul Islam ◽  
Biswajyoti Mukherjee ◽  
M. Sribalaji ◽  
O.S. Asiq Rahman ◽  
P. Arunkumar ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Graphene Nanoplatelets ◽  
Alumina Coating ◽  
Hybrid Reinforcement ◽  
Plasma Sprayed

Tribological behaviour of plasma-sprayed WC coatings with and without laser remelting

Wear ◽  
2000 ◽  
Vol 239 (2) ◽  
pp. 274-281 ◽  
Author(s):  
J Mateos ◽  
J.M Cuetos ◽  
E Fernández ◽  
R Vijande
Keyword(s):  
Laser Remelting ◽  
Tribological Behaviour ◽  
Plasma Sprayed

Multiscale wear of plasma-sprayed carbon-nanotube-reinforced aluminum oxide nanocomposite coating

2008 ◽  
Vol 56 (20) ◽  
pp. 5984-5994 ◽  
Author(s):  
Kantesh Balani ◽  
Sandip P. Harimkar ◽  
Anup Keshri ◽  
Yao Chen ◽  
Narendra B. Dahotre ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Aluminum Oxide ◽  
Nanocomposite Coating ◽  
Plasma Sprayed
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