Mo-doped Cr-Ti-Mo ternary o-MAX with ultra-low wear at elevated temperatures br

被引：26

作者：

Du, Cheng-Feng ^{[1
]}

Xue, Yaqing ^{[1
]}

Zeng, Qingyan ^{[1
]}

Wang, Jinjin ^{[1
]}

Zhao, Xiangyuan ^{[1
]}

Wang, Zjiao ^{[1
]}

Wang, Chuanchao ^{[1
]}

Yu, Hong ^{[1
]}

Liu, Weimin ^{[1
,2
]}

机构：

[1] Northwestern Polytech Univ, Ctr Adv Lubricat & Seal Mat, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

[2] Chinese Acad Sci, Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2022年 / 42卷 / 16期

基金：

中国国家自然科学基金;

关键词：

MAX; Solid solution; High; -temperature; Trib-oxidation; Antiwear; X-RAY PHOTOELECTRON; PHASE; OXIDATION; TI3ALC2; BEHAVIOR; CR2ALC; CORROSION; TI3SIC2; AL2O3;

D O I：

10.1016/j.jeurceramsoc.2022.09.020

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work, the Cr-Ti-Mo ternary o-MAX ceramics based on the Cr2TiAlC2 phase are synthesized, and their tribological performance at elevated temperatures up to 800 degrees C in the air is evaluated. With Si3N4 as a tribocouple, an unexpected ultra-low wear rate reaching 6.1 x 10-8 mm3 N-1 m-1 is observed in Cr1.9Ti0.9Mo0.2AlC2 at 800 degrees C, accompanied by a stable coefficient of friction (COF) around 0.33 in a wide temperature range. X-ray photoelectron spectroscopy (XPS) depth profiling confirms a tribofilm with gradient composition, which simultaneously offers fluid lubricating at elevated temperatures and self-healing after cooling. Particularly, confirmed by the theoretical simulations, the doping of Mo improves the interlayer binding as well as alters the oxidation behaviors of Cr2TiAlC2. With an optimal interlayer binding strength and oxidation rate, the Cr1.9Ti0.9Mo0.2AlC2 can generate a tribofilm possessing ideal composition, which simultaneously promotes lubrication and anti-wear performance at elevated temperatures.

引用

页码：7403 / 7413

页数：11

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