连续制动条件下泡沫陶瓷/金属双连续相复合材料的摩擦磨损性能

doi:10.11868/j.issn.1001-4381.2021.000520

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Abstract

In order to solve the overheating failure problem of mechanical brakes of special tracked vehicles, SiC/Cu and SiC/Fe bi-continuous composites were prepared by squeeze casting method. The friction and wear properties of the two composites under continuous emergency braking and continuous high temperature braking conditions were studied. The variation of friction coefficient, temperature and wear rate was analysed by means of scanning electron microscopy (SEM), X-ray energy dispersive spectrometry (EDS) and 3D profiler, and the wear mechanism was described. The results show that in the continuous emergency braking test, the contact surface experiences the process of tribo-film formation and interlayer fracture.Friction coefficient decreases slightly with the increase of joining times and tends to be stable. In the first 40 joining, the wear rates of SiC/Cu and SiC/Fe friction pairs decrease overall. During 40-60 joining, the adhesion wear, oxidation wear and fatigue wear of the SiC/Cu friction pair are aggravated, and the wear rate increases, while the wear rate of the SiC/Fe friction pair is mainly abrasive wear, and the wear rate is low. In the continuous high temperature braking test, the friction coefficient increases gradually and the braking time decreases gradually in the first six joining. After the sixth joining, the adhesion wear and fatigue wear in the edge area of the friction pair result in the decrease of the torque, and the friction coefficient and braking time both show a trend of decrease at first and then increase. In the process of continuous high temperature braking, severe adhesive wear is the main factor. The wear rates of SiC/Cu and SiC/Fe friction pairs increase with the increase of joining times.

Key words： bi-continuous phase composites braking friction and wear wear mechanism

Received: 02 June 2021 Published: 18 April 2022

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Corresponding Authors: Guimin LIU E-mail: liuguimin1971@sina.com

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	Yang HUI
	Guimin LIU
	Hai LAN
	Jianhua DU

Cite this article:

Yang HUI,Guimin LIU,Hai LAN, et al. Friction and wear properties of foam ceramic/metal bi-continuous phase composites under continuous braking conditions[J]. Journal of Materials Engineering, 2022, 50(4): 112-122.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2021.000520 OR http://jme.biam.ac.cn/EN/Y2022/V50/I4/112

Technical requirements for friction components

Schematic diagram of test condition

Micromorphologies of ceramic/metal bi-continuous phase composites
(a)SEM morphology of SiC/Cu;(b) SEM morphology of SiC/Fe;(c)CBS morphology of the SiC/Cu mesh area;(d)CBS morphology of SiC/Fe mesh area

EDS component analysis of ceramic/metal bi-continuous phase composites

Average friction coefficient and maximum temperature curves during continuous emergency braking

Three-dimensional morphologies of wear scar of SiC/Cu friction pair (1) and SiC/Fe friction pair (2) during continuous emergency braking
(a)the 10th joining;(b)the 30th joining;(c)the 50th joining

Average torque and braking time curves during continuous emergency braking

Wear rate of friction pair during continuous emergency braking

Instantaneous friction coefficient (a) and temperature (b) curves during continuous high temperature braking

Three-dimensional morphologies of wear scar of SiC/Cu friction pair (1) and SiC/Fe friction pair (2) during continuous high temperature braking
(a)before the first joining;(b)after the first joining;(c)the 6th joining

Wear rate of friction pair during continuous high temperature braking

Micromorphologies of wear scar of SiC/Cu friction pair after continuous emergency braking
(a)internal area;(b)external area;(c)central area

Micromorphologies of wear scar of SiC/Fe friction pair after continuous emergency braking
(a)internal area;(b)external area;(c)central area

EDS component analysis of selected areas in fig. 10 and fig. 11

Micromorphologies of wear scar of SiC/Cu friction pair after continuous high temperature braking
(a)internal area;(b)external area;(c)central area

Micromorphologies of wear scar of SiC/Fe friction pair after continuous high temperature braking
(a)internal area;(b)external area;(c)central area

EDS component analysis of selected areas in fig. 12 and fig. 13

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