Microstructure, mechanical and tribological property of multi-components synergistic self-lubricating NiCoCrAl matrix composite

A multi-component synergistic self-lubricating NiCoCrAl matrix composite was fabricated by high-energy ball milling and spark plasma sintering. The composite exhibited excellent work hardening capability and mechanical properties which mainly attributed to the optimized microstructure and high conte...

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Bibliographic Details
Published in:Tribology international 2019-03, Vol.131, p.508-519
Main Authors: Cao, Silong, Zhou, Jiansong, Wang, Lingqian, Yu, Youjun, Xin, Benbin
Format: Article
Language:English
Subjects:
Ball milling
Coefficient of friction
Lanthanum fluorides
Lubricants
Lubricants & lubrication
Lubrication
Mechanical properties
Microstructure
Molybdates
Molybdenum disulfide
Oxidation
Plasma sintering
Self lubrication
Silver
Spark plasma sintering
Synergistic self-lubricating composite
Tribological properties
Tribology
Wear rate
Work hardening
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Summary:A multi-component synergistic self-lubricating NiCoCrAl matrix composite was fabricated by high-energy ball milling and spark plasma sintering. The composite exhibited excellent work hardening capability and mechanical properties which mainly attributed to the optimized microstructure and high content of hard reinforced phases. The outstanding self-lubricating property was deriving from the multiple-components synergistic lubricant including Ag, MoS2, LaF3 and CeF3 at room temperature. A continuous smooth tribofilm consisting of various silver molybdates and metallic oxide prevented the direct contact between the Si3N4 ball and the composite resulting in significantly decrease the friction coefficient and wear rate at 800 °C. However, the solid lubrication generated oxidation deterioration without the lubricating effect causing the relative serious worn damage at 400 °C. •NiCr-coated MoS2 played a great protective role during the process of sintering.•Hard reinforced γ′-Ni3Al and Cr7C3 phases significantly improve the hardness while reducing the fracture toughness.•Multiple-components synergistic lubricant at room temperature decrease the friction coefficient and wear rate.•Various silver molybdates and metallic oxide formed continuous smooth tribofilm to prevent the severe worn.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2018.10.050