Microstructures and Wear Behavior of Nickel - Coated Graphite/NiCrW Alloy Composite

DUAN Zhao - yu, LI Chang - sheng, KAI Shao - sen, LI Jian

doi:10.16577/j.cnki.42-1215/tb.2021.04.001

Materials Protection >

2021 , Vol. 54 >Issue 4: 1 - 6

DOI: https://doi.org/10.16577/j.cnki.42-1215/tb.2021.04.001

Microstructures and Wear Behavior of Nickel - Coated Graphite/NiCrW Alloy Composite

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(School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China)

Received date: 2020-10-21

Online published: 2025-07-10

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Abstract

In order to improve the friction and wear properties of NiCrW - based alloys, the nickel - plated graphite with uniform thickness and compactness was prepared by electroless plating. With using pure graphite and nickel - plated graphite as lubricants and the NiCrW alloy powder as the matrix, NiCrW/graphite self - lubrication composites with high mechanical properties and good self - lubricating properties were prepared via powder metallurgy. In addition, the influences of different nickel - plated graphite content on the microstructure and tribological properties of composites were studied systematically. Results showed that because the nickel - plated graphite in composites possessed better dispersibility and better combination to the matrix, which endowed the composites with better microstructure, mechanical performance and tribological properties than those added with pure graphite. With the increase of graphite content, friction coefficient and wear rate of NiCrW/graphite composites decreased first and then increased. When the content of nickel - plated graphite was 3%(mass fraction), the as - obtained NiCrW/graphite composites possessed the optimal tribological properties, which had 0.27 of friction coefficient and 3.2×10-5 mm3/(N·m) of wear rate.

Key words： powder metallurgy; nickel - based alloy; self - lubrication; microstructure; tribological properties

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DUAN Zhao - yu, LI Chang - sheng, KAI Shao - sen, LI Jian . Microstructures and Wear Behavior of Nickel - Coated Graphite/NiCrW Alloy Composite[J]. Materials Protection, 2021 , 54(4) : 1 -6 . DOI: 10.16577/j.cnki.42-1215/tb.2021.04.001

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