Friction and wear properties of PE⁃UHMW modified with nano⁃SiO2 and PA6

doi:10.19491/j.issn.1001-9278.2022.04.009

Abstract

Abstract:

The effects of nano?SiO₂ and its composites with polyamide 6 on the tribological properties of ultra?high molecular weight polyethylene （PE?UHMW） were investigated using electronic universal testing machine， M?2000 friction testing machine， electron and optical microscope. The results indicate that the friction coefficient and wear rate of PE?UHMW composites decreased at first and then tended to increase with an increase in the nano?SiO₂ content. The composites exhibited the lowest friction coefficient and wear rate at a nano?SiO₂ content of 2 wt%. When 8 wt% polyamide 6 was added into the PE?UHMW composite containing 2 wt% nano?SiO₂， the composites obtained a low friction coefficient of 0.29 and a low wear rate of 0.33×10^-9 g/（N?m）. The wear mechanism analysis indicated that the addition of nano?SiO₂ could effectively inhibit the adhesive wear and plastic deformation of PE?UHMW， and PE?UHMW composite with appropriate nano?SiO₂ and polyamide 6 can form a more uniform and compact self?lubricating transfer film， and the wear surface becomes more smooth and present a very slight abrasive wear characteristics.

Key words: ultra?high molecular weight polyethylene, nano?silicon dioxide, polyamide 6, friction, wear

CLC Number:

TQ325.1⁺2

XU Rongxia, WEI Gang, WEI Lilan, WU Jiecui, JIANG Yujiang. Friction and wear properties of PE⁃UHMW modified with nano⁃SiO₂ and PA6[J]. China Plastics, 2022, 36(4): 47-52.

Figures/Tables 8

样品编号	组分含量（质量分数）/%
样品编号	PE⁃UHMW	Nano⁃SiO₂	PE⁃HD⁃g⁃MAH	PA6
A	100	0	0	0
B	99	1	0	0
C	98	2	0	0
D	97	3	0	0
E	93	2	5	0
F	89	2	5	4
G	85	2	5	8
H	81	2	5	12

Tab.1. Formula of the samples

样品	拉伸强度/MPa	断裂伸长率/%
A	32.41	384.08
B	33.14	378.87
C	33.42	366.72
D	32.12	349.01
E	33.78	344.17
F	30.59	281.65
G	28.45	200.65
H	23.06	152.13

Tab.2. Mechanical properties of PE?UHMW composites

Fig.1. Shore hardness of modified PE?UHMW composites

Fig.2. Variation curve of friction coefficient with time

Fig.3. Friction coefficient of PE?UHMW composite while being stabilized

Fig.4. Wear rate of PE?UHMW composite

Fig. 5. SEM of worn sections

Fig.6. Optical image of transfer film

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Friction and wear properties of PE⁃UHMW modified with nano⁃SiO₂ and PA6

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References 18

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