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Volume 13
Issue 5
10.3390/coatings13050952
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Article

Morphology and Composition of the Third Body on the Friction Surface of an Organic Composite Railway Brake Shoe

by
Chunjiang He
1,*,
Yuan Ji
1,
Dingfeng Pei
1,
Ming Gao
1,
Chuanzhi Chen
2,
Jingcun Zhao
1 and
Wei Wang
1
1
Metals and Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China
2
Standards and Metrology Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Coatings 2023, 13(5), 952; https://doi.org/10.3390/coatings13050952
Submission received: 30 April 2023 / Revised: 14 May 2023 / Accepted: 17 May 2023 / Published: 19 May 2023
(This article belongs to the Special Issue Friction, Wear, Lubrication and Mechanics of Surfaces and Interfaces)
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Abstract

Friction properties are significantly affected by third bodies (films formed on friction surfaces). However, the study of their composition and structure remains incomplete. For this reason, an organic composite railway brake shoe was tested at an initial braking speed of 125 km/h using a full-scale dynamometer. A third body with a thickness of ~120 μm was obtained, and its morphology and composition were analyzed using a multiple techniques. The results indicated that the third body had a layered structure. The upper surface was smoother than the lower surface. The carbon content on the upper surface decreased by 68.01%, and the iron content increased by 11.85 times in relation to that on the lower surface. Compared to the brake shoe, the iron content of the third body increased by 272.81%, and most of the iron was oxidized. Furthermore, the content of barium, calcium, and silicon decreased by more than 33%, and the crystalline structures of the inorganic filler materials, such as graphite and barium sulfate, were destroyed, with new crystalline structures appearing. Finally, the residual weight at 650 °C increased from 90.35% to 96.59%. This research could provide a reference for exploring the friction and wear mechanisms of organic composite railway brake shoes.
Keywords: brake shoe; third body; surface; friction brake shoe; third body; surface; friction

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MDPI and ACS Style

He, C.; Ji, Y.; Pei, D.; Gao, M.; Chen, C.; Zhao, J.; Wang, W. Morphology and Composition of the Third Body on the Friction Surface of an Organic Composite Railway Brake Shoe. Coatings 2023, 13, 952. https://doi.org/10.3390/coatings13050952

AMA Style

He C, Ji Y, Pei D, Gao M, Chen C, Zhao J, Wang W. Morphology and Composition of the Third Body on the Friction Surface of an Organic Composite Railway Brake Shoe. Coatings. 2023; 13(5):952. https://doi.org/10.3390/coatings13050952

Chicago/Turabian Style

He, Chunjiang, Yuan Ji, Dingfeng Pei, Ming Gao, Chuanzhi Chen, Jingcun Zhao, and Wei Wang. 2023. "Morphology and Composition of the Third Body on the Friction Surface of an Organic Composite Railway Brake Shoe" Coatings 13, no. 5: 952. https://doi.org/10.3390/coatings13050952

APA Style

He, C., Ji, Y., Pei, D., Gao, M., Chen, C., Zhao, J., & Wang, W. (2023). Morphology and Composition of the Third Body on the Friction Surface of an Organic Composite Railway Brake Shoe. Coatings, 13(5), 952. https://doi.org/10.3390/coatings13050952

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