材料科学
摩擦学
MXenes公司
润滑
纳米晶材料
无定形固体
复合材料
纳米材料
纳米核糖学
剪切(地质)
耐磨性
纳米技术
冶金
有机化学
化学
作者
Philipp G. Grützmacher,Sebastián Súarez,Aura Tolosa,Carsten Gachot,Gongsheng Song,Bo Wang,Volker Presser,Frank Mücklich,Babak Anasori,Andreas Rosenkranz
出处
期刊:ACS Nano
[American Chemical Society]
日期:2021-04-06
卷期号:15 (5): 8216-8224
被引量:108
标识
DOI:10.1021/acsnano.1c01555
摘要
Owing to MXenes' tunable mechanical properties induced by their structural and chemical diversity, MXenes are believed to compete with state-of-the-art 2D nanomaterials such as graphene regarding their tribological performance. Their nanolaminate structure offers weak interlayer interactions and an easy-to-shear ability to render them excellent candidates for solid lubrication. However, the acting friction and wear mechanisms are yet to be explored. To elucidate these mechanisms, 100-nm-thick homogeneous multilayer Ti3C2Tx coatings are deposited on technologically relevant stainless steel by electrospraying. Using ball-on-disk tribometry (Si3N4 counterbody) with acting contact pressures of about 300 MPa, their long-term friction and wear performance under dry conditions are studied. MXene-coated specimens demonstrate a 6-fold friction reduction and an ultralow wear rate (4 × 10-9 mm3 N-1 m-1) over 100 000 sliding cycles, outperforming state-of-the-art 2D nanomaterials by at least 200% regarding their wear life. High-resolution characterization verified the formation of a beneficial tribolayer consisting of thermally/mechanically degraded MXenes and amorphous/nanocrystalline iron oxides. The transfer of this tribolayer to the counterbody transforms the initial steel/Si3N4 contact to tribolayer/tribolayer contact with low shear resistance. MXene pileups at the wear track's reversal points continuously supply the tribological contact with fresh, lubricious nanosheets, thus enabling an ultra-wear-resistant and low-friction performance.
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