Journal
MATERIALS TODAY COMMUNICATIONS
Volume 23, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2020.100924
Keywords
Boron carbide; Silicon carbide; Tribochemistry; Boric acid; Silica gel
Categories
Funding
- National Key R&D Program of China [2018YFB0703801]
- National Natural Science Foundation of China [51775535]
- Key Projects of Guangxi province science and technology plan
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In present investigation, we evaluated the corrosion resistance of the B4C coating by the potentiodynamic polarization tests. Compared with the 304 L steel substrate, the B4C coatings deposited by unbalanced magnetron sputtering technology exhibited excellent corrosion resistance. Furthermore, we systematically tested the B4C coatings rubbing against SiC ball under 85 % RH condition by a ball-on-disk tribometer with various normal loads and sliding speeds. The results showed that disc wear rates were maintained in the order of 10(-7)mm(3) .N(-1)m(-1) and a much low friction coefficient (similar to 0.047) was achieved under 5 N and 0.07 m/s. In addition, the tribological performances of B4C coating rubbing against SiC ball under 85 % RH were better than those of DLC/SiC friction pairs. This is mainly due to the formation of a thin tribo-chemical film containing boric acid with passivated edges sites and silica gel on the sliding interface. According to SEM results, the wear mechanism for the B4C coating was also analyzed.
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