TY - JOUR
T1 - Ultrahigh radiation resistance of nanocrystalline diamond films for solid lubrication in harsh radiative environments
AU - Xu, Jiao
AU - Dai, Jun
AU - Ren, Fuzeng
AU - Wang, Yongfu
AU - Wang, Peng
AU - Xu, Shusheng
AU - Wu, Sudong
AU - Lin, Jianjun
AU - Yang, Yun
AU - Guo, Dengji
AU - Wang, Xujin
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/9
Y1 - 2021/9
N2 - In this study, different types of carbon films, including diamond-like carbon (DLC), fullerene-like carbon (FLC), and nanocrystalline diamond (NCD) films, were studied in detail. The film structural and property changes before and after heavy-ion irradiation with increased displacement damage were investigated. The results reveal that radiation-induced structural changes result in heavily degraded lubricant properties of DLC and FLC films but can help improve the lubricant properties of NCD films. The displacement damage of 2.0 dpa was a threshold parameter above which the nanocomposite NCD films stepped into a quasi-saturation state to create an amorphous structure with an ultralong lifetime (more than 6.0 × 105 cycles) and excellent antiwear properties (magnitude of 10−7 mm3/N‧m), which is of great importance for the application of NCD films in nuclear reactors. The radiated NCD films could produce tribofilms configured in an amorphous structure, which provided superior lubricant properties to the graphitic tribofilms of DLC and FLC films. The results also contribute to a novel principle for prolonging the lifetime of solid lubricant films in ion-radiation environments, based on the significant tribological properties of the radiation-produced amorphous layer in a quasi-saturation state.
AB - In this study, different types of carbon films, including diamond-like carbon (DLC), fullerene-like carbon (FLC), and nanocrystalline diamond (NCD) films, were studied in detail. The film structural and property changes before and after heavy-ion irradiation with increased displacement damage were investigated. The results reveal that radiation-induced structural changes result in heavily degraded lubricant properties of DLC and FLC films but can help improve the lubricant properties of NCD films. The displacement damage of 2.0 dpa was a threshold parameter above which the nanocomposite NCD films stepped into a quasi-saturation state to create an amorphous structure with an ultralong lifetime (more than 6.0 × 105 cycles) and excellent antiwear properties (magnitude of 10−7 mm3/N‧m), which is of great importance for the application of NCD films in nuclear reactors. The radiated NCD films could produce tribofilms configured in an amorphous structure, which provided superior lubricant properties to the graphitic tribofilms of DLC and FLC films. The results also contribute to a novel principle for prolonging the lifetime of solid lubricant films in ion-radiation environments, based on the significant tribological properties of the radiation-produced amorphous layer in a quasi-saturation state.
KW - Heavy-ion irradiation
KW - Nanocrystalline diamond film
KW - Quasi-saturation state
KW - Structural conversion
KW - Ultra-high radiation resistance
UR - https://www.scopus.com/pages/publications/85108432459
U2 - 10.1016/j.carbon.2021.06.056
DO - 10.1016/j.carbon.2021.06.056
M3 - Article
AN - SCOPUS:85108432459
SN - 0008-6223
VL - 182
SP - 525
EP - 536
JO - Carbon
JF - Carbon
ER -