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Research Papers: Friction and Wear

Studies on Dynamic Tribology Properties of Friction Materials by Using an Approximate In Situ Observation for Worn Surfaces

[+] Author and Article Information
Weitao Sun, Wenlong Zhou, Jianfa Liu, Guoqing Chen, Shan Yao

Key Laboratory of Solidification Control
and Digital Preparation Technology,
School of Materials Science and Engineering,
Dalian University of Technology,
Dalian 116085, China

Xuesong Fu

Key Laboratory of Solidification Control
and Digital Preparation Technology,
School of Materials Science and Engineering,
Dalian University of Technology,
Dalian 116085, China
e-mail: xsfu@dlut.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 6, 2017; final manuscript received April 16, 2018; published online May 14, 2018. Assoc. Editor: Min Zou.

J. Tribol 140(5), 051607 (May 14, 2018) (9 pages) Paper No: TRIB-17-1419; doi: 10.1115/1.4040053 History: Received November 06, 2017; Revised April 16, 2018

This paper primarily focused on the dynamic tribology properties of one certain nonasbestos organic (NAO) friction material by using an approximate in situ method. This study was performed through a pad-on-disk type friction tester under different temperature conditions. Results showed that temperature has a significant effect on the dynamic tribology performance. At 100 °C, friction coefficient and wear rate after the running-in stage varied little with time. At 250 °C, friction coefficient after the running-in stage increased gradually and then tended to be stable, while wear rate decreased gradually. From 100 to 350 °C, friction coefficient increased first as a function of temperature, but decreased sharply when the temperature was over 250 °C. Simultaneously, wear rate also increased sharply over 250 °C. Additionally, three dynamic evolution models of worn surfaces corresponding to different cases were established.

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Figures

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Fig. 1

Schematic diagram of JF151 friction tester

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Fig. 2

Microstructure of the polished material identified by SEM equipped with EDS

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Fig. 3

Friction coefficient and wear as a function of time under different temperature conditions: (a) at 100 °C, (b) at 250 °C, and (c) from 100 to 350 °C

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Fig. 4

SEM microtopography of worn surfaces as a function of time at 100 °C: (a) 600 s, (b) 2400 s, and (c) 3600 s (primary plateaus are marked by circles; spalled pits are marked by boxes; grooves are marked by arrows)

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Fig. 5

Dynamic evolution models of worn surfaces at 100 °C: (a) worn surfaces before friction, (b) primary plateaus are formed first by ingredients with good wear resistance, (c) disintegration or damage of plateaus, and (d) new plateaus are formed again

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Fig. 6

Micromorphology and composition of some plateaus on the worn surfaces corresponding to the running-in stage: (a) SEM image of chromite powder, (b) SEM image of steel fiber, and (c) EDS pattern of the white box in (a)

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Fig. 7

SEM microtopography of worn surfaces with time at 250 °C: (a1) 900 s, 100×; (a2) 900 s, 500×, the worn surfaces are characterized by some primary plateaus; (b1) 2400 s, 100×; (b2) 2400 s, 500×, the formation of second plateaus; and (c1) 3600 s, 100×; (c2) 3600 s, 500×, the plateaus area increases and tends to be stable

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Fig. 8

EDS result of plateaus corresponding to 2400 s at 250 °C

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Fig. 9

Dynamic evolution models of worn surfaces at 250 °C: (a) worn surfaces before friction, (b) primary plateaus are formed through an adhesive mode, (c) the formation of second plateaus, and (d) second plateaus with a stable size

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Fig. 10

SEM image of debris collected during 600–900 s at 250 °C

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Fig. 11

The illustration of the standard test procedures (The whole fiction process including two stages, running-in stage and test stage. The running-in stage was performed at 80 °C with a duration of 600 s. The test stage from 100 to 350 °C with a duration of 3600 s. The rise of temperature is not continuous and each temperature was carried out for 600 s.)

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Fig. 12

Worn surfaces corresponding to different temperatures observed by SEM: (a) 100 °C, the worn surfaces are characterized by isolated plateaus, (b) 200 °C, isolated plateaus pile up, (c) 250 °C, the formation and growth of second plateaus, and (d) 350 °C, the large second plateaus are dragged toward the tail of the specimen

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Fig. 13

Dynamic evolution models of worn surfaces from 100 to 350 °C: (a) worn surfaces before friction, (b) primary plateaus formed by ingredients with well wear resistance, (c) primary plateaus and chips pile up and develop into second plateaus, (d) second plateaus with a critical size, and (e) large second plateaus are dragged toward the tail of specimens

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