Thermal Shock Resistance of Double-glow Plasma Ta/TaC Coating on Graphite Surface
WANG Yan1, YANG Kai1, LYU Xuming2,3, DANG Bo1, WEI Dongbo1, ZHANG Pingze1,*
1 School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2 Research Institute of Physical and Chemical Engineering of Nuclear Industry, Tianjin 300180, China 3 Science and Technology on Particle Transport and Separation Key National Defense Laboratory, Tianjin 300180, China
Abstract: In order to alleviate the thermal mismatch between the graphite electrode surface coating and the substrate due to the disparity in mechanical properties and coefficient of thermal expansion, Ta, TaC and Ta/TaC coatings were prepared on the graphite surface by double-glow technology. XRD results show that the surface phase of Ta coating is mainly composed of Ta, Ta4C3 and Ta2C, while the surface of TaC and Ta/TaC coating is pure TaC phase. SEM results show that all coatings are composed of interdiffusion layer and surface deposition layer, and the interior is uniform and dense. Compared with TaC, Ta is easier to diffuse into the graphite, and TaC is easier to grow on Ta under the same conditions. The mechanical properties test results show that Ta coating can effectively improve the binding quality and microhardness of TaC coating and substrate because of its excellent physical buffering effect. The thermal shock results show that the single-layer TaC coating is spalling se-riously due to great stress mismatch after 40 times of cycles between room temperature and 650 ℃. Ta/TaC composite coating can effectively alleviate the stress mismatch in the process of cold and hot cycling due to the existence of Ta transition layer. No cracks are found on the surface and the film-base interface is still good. The thermal shock resistance of the composite coating is significantly improved.
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2024, Vol. 38 
