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Research Article | Open Access

Investigation of calcium phosphate (CaP) tribofilms from commercial automatic transmission fluids (ATFs) and their correlation with antishudder performance

Zechao DI1( ), Jingjing XU1, Yang LIU1, Yu JIANG1, Dongsheng HUANG1, Haitao CUI1, Zhongguo LIU1, Zhiyu ZHAO1, Shaohui LI1
Dalian Lubricating Oil Research & Development Institute, PetroChina, Dalian 116032, China
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Abstract

The friction properties of wet clutches are highly dependent on the surface tribofilms formed by automatic transmission fluids (ATFs). Here, four commercial ATFs were evaluated with a disc-on-disc tribometer to study tribofilm formation on steel surfaces and the effects of tribofilms on the friction properties. The chemical composition, stoichiometry, structure, and thickness of the tribofilms were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), secondary ion mass spectrometry (SIMS), and X-ray photoelectron spectroscopy (XPS). Calcium phosphate (CaP) tribofilms form on the friction surface with all ATFs, which contributes to their antishudder characteristics. The thickness and surface coverage of CaP tribofilms are positively correlated with their antishudder properties.

Keywords

tribofilmcommercial ATFantishudderhydroxyapatite

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Friction
Volume 8 Issue 5,
October 2020
Pages 882-892
DOI: 10.1007/s40544-019-0305-3
Cite this article:
DI Z, XU J, LIU Y, et al. Investigation of calcium phosphate (CaP) tribofilms from commercial automatic transmission fluids (ATFs) and their correlation with antishudder performance. Friction, 2020, 8(5): 882-892. https://doi.org/10.1007/s40544-019-0305-3

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Received: 10 October 2018
Revised: 26 December 2018
Accepted: 30 May 2019
Published: 09 September 2019
© The author(s) 2019

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