High Temperature Tribological Properties and High-Temperature Lubrication Mechanism of NiAl-Based Composites with the Addition of Ag2Nb4O11

被引：0
|
作者：
Feng X. [1 ,3 ]
Jia J. [1 ,2 ]
Gao Q. [1 ,3 ]
Yang J. [1 ,3 ]
Wang W. [1 ,3 ]
Yi G. [1 ,3 ]
Wang Q. [1 ,3 ]
机构：
[1] Sate Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou
[2] College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi'an
[3] Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing
来源：
Mocaxue Xuebao/Tribology | 2021年 / 41卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Ag[!sub]2[!/sub]Nb[!sub]4[!/sub]O[!sub]11[!/sub; High-temperature lubricating mechanism; Lubrication film; Powder metallurgy; Wear-resistance;
D O I：
10.16078/j.tribology.2020100
中图分类号：
学科分类号：
摘要：
The Ag2Nb4O11 powders with micro grade particle were synthesized by high-temperature solid state reaction method, then NiAl-based composites with the addition of Ag2Nb4O11 (NABO20, NiAl-20%Ag2Nb4O11) were prepared by powder metallurgy technology. The influence of silver niobates (Ag2Nb4O11) on the microstructure, mechanical properties and tribological behaviors of NiAl-based composites at elevated temperatures was investigated. The results showed that the Ag2Nb4O11 phase was decomposed and reacted with C element to form NbC and Ag phase in hot-pressing sintering process. The addition of Ag2Nb4O11 slightly increased the density of composite and significantly increased the microhardness of composites. At 800 ℃, because the complete and smooth lubrication films (Nb2O5, Al2O3, Ag2Nb4O11, AgNbO3 and AgNb3O8) on worn surfaces of NABO20 composite and Al2O3 counterpart ball prevented the direct contact of the composite and its counterpart, the wear-resistance of the composite was improved effectively. Copyright ©2021 Tribology. All rights reserved.
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页码：187 / 196
页数：9
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