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research-article

Anti-galling Effects of a- Zirconium Phosphate Nanoparticles as Grease Additives

[+] Author and Article Information
Yan Chen

Department of Materials Science & Engineering, Texas A&M University, College Station, TX 77843
yanchen876@tamu.edu

Xuezhen Wan

Department of Chemistry, Texas A&M University, College Station, TX 77843
xuezhenwang@tamu.edu

Abraham Clearfield

Department of Chemistry, Department of Materials Science & Engineering, Texas A&M University, College Station, TX 77843
clearfield@chem.tamu.edu

Hong Liang

Department of Mechanical Engineering, Department of Materials Science & Engineering, Texas A&M University, College Station, TX 77840
hliang@tamu.edu

1Corresponding author.

ASME doi:10.1115/1.4041538 History: Received July 22, 2018; Revised September 17, 2018

Abstract

Grease plays important roles in reducing frictional loss and providing protection of rubbing surfaces. In this research, we investigated the effects of a- zirconium phosphate nanoparticles as additives in grease on the galling behavior of a pair of steels (4130 against P530). Results showed that the addition of 0.5wt% of nanoparticles could reduce the friction for 10% and galling 80%. In terms of particle sizes, the 1µm-sized particles have profound influence in galling reduction. This is due to the increased contribution of van der Waals forces in the stacked layers of those particles. Under shear, those particles are exfoliated, resulting in low friction and more surface coverage to protect surfaces from galling.

Copyright (c) 2018 by ASME
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