Abstract
A thick copper coating on the triangular plates of vacuum vessels has been proposed for plasma passivation and vertical stability in tokamak. Laser cladding technique is utilized to develop such coatings. However, the process leads to a drastic decrease in the thermal conductivity of the copper coating. Regaining the thermal conductivity of laser cladded copper is a challenging task. In this work, we have verified that graphene deposition can improve the thermal conductivity of laser cladded copper. Graphene layers have been grown on a 3-mm-thick laser cladded copper at 900 °C under methane, argon, and hydrogen atmosphere inside a thermal chemical vapor deposition system. The thermal conductivity of the laser cladded copper was found to be improved from 140 W/mK for as-deposited cladding to 309 W/mK after graphene growth. Further, structural morphology and thermal conductivity of graphene-coated laser cladded copper remained intact after irradiation tests with high-energy prompt gamma-rays and heavy nuclei exposure, which depicted its sustainability in actual environmental conditions.
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Acknowledgements
The authors thank Dr. Pushpendra P. Singh for allowing and executing the irradiation of samples with 7Li-ion beams and radiations.
Funding
The authors would like to thank the Department of Science and Technology-Funds for Improvement in Science and Technology (DST-FIST), India (Grant number: SR/FST/ETI-379/2014), for the financial support which helped in creating the facilities to carry out this work.
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V.G. and G.S.: graphene synthesis and characterizations; V.G.: data analysis; V.G., S.S., and S.S.: data interpretation; P.K.A.: CVD system for graphene growth; H.S.: coordination of the project and funding. All authors have discussed the data and contributed to the writing of the manuscript.
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Singh, G., Ghai, V., Chaudhary, S. et al. Effect of graphene on thermal conductivity of laser cladded copper. emergent mater. 4, 1491–1498 (2021). https://doi.org/10.1007/s42247-021-00233-2
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DOI: https://doi.org/10.1007/s42247-021-00233-2