Effect of Graphite Orientation on Tribological Properties of Polyimide

doi:10.19491/j.issn.1001-9278.2020.05.004

Abstract

Abstract:

Polyimide (PI)/natural flake graphite (NG) composites were prepared by a hot?pressing technology, and their tribological properties as well as the morphologies of fracture and worn surfaces were investigated. The results indicated that NG was oriented in the direction perpendicular to the molding pressure in the PI matrix. When the load was constant and the sliding speed was low, the friction coefficient of the composites was reduced more significantly by the NG perpendicular to the friction surface than by that parallel to the friction surface. There was a reverse in this trend with an increase of sliding speed. Moreover, the transition point shifted to a low speed when the load increased. There was a tight relationship between the tribological properties and the morphologies of worn surfaces, and the smoother the worn surface, the lower were the friction coefficient and wear rate.

Key words: graphite, orientation, polyimide, tribological property

CLC Number:

TQ323.7

Rui YANG, Zhengtao SU, Hongbo LI, Wenbo ZHAO. Effect of Graphite Orientation on Tribological Properties of Polyimide[J]. China Plastics, 2020, 34(5): 21-25.

Figures/Tables 7

References 14

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石墨的取向	滑动速度/m·s^?1	载荷/N	摩擦因数	磨损率/10^?6 mm³·N^?1·m^?1	表面粗糙度/μm
平行	0.2	100	0.45	2.11	0.47
平行	0.4	100	0.31	1.56	0.36
平行	0.6	100	0.23	1.32	0.25
平行	0.8	100	0.16	1.19	0.19
平行	1.0	100	0.14	0.93	0.11
垂直	0.2	100	0.36	1.86	0.40
垂直	0.4	100	0.25	1.37	0.34
垂直	0.6	100	0.21	1.29	0.30
垂直	0.8	100	0.18	1.21	0.25
垂直	1.0	100	0.16	1.09	0.23

石墨的取向	滑动速度/m·s^?1	载荷/N	摩擦因数	磨损率/10^?6 mm³·N^?1·m^?1	表面粗糙度/μm
平行	0.2	100	0.45	2.11	0.47
平行	0.4	100	0.31	1.56	0.36
平行	0.6	100	0.23	1.32	0.25
平行	0.8	100	0.16	1.19	0.19
平行	1.0	100	0.14	0.93	0.11
垂直	0.2	100	0.36	1.86	0.40
垂直	0.4	100	0.25	1.37	0.34
垂直	0.6	100	0.21	1.29	0.30
垂直	0.8	100	0.18	1.21	0.25
垂直	1.0	100	0.16	1.09	0.23

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