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Abstract: Kaolin filled ultra high molecular weight polyethylene (UHMWPE)
based composites (coded as UHMWPE/Kao-lin) are prepared by
polymerization filling and melt mixing, respectively. The friction and
wear properties of the composites under sliding against AISI 1045 steel
lubricated with water are evaluated with an MM-200 friction and wear
tester. The morphologies of the worn composite surfaces and the transfer
films on the counterface steel are observed by means of scanning
electron microscopy (SEM) and stereo optical microscopy, and the wear
mechanisms of the composites are discussed. The results show that,
kaolin at a certain content is very effective to reduce the friction and
wear of UHMWPE. UHMWPE/Kaolin composites prepared by polymerization
filling are superior to the ones prepared by melt mixing with the same
filler content in terms of reducing wear. Lubricated with water can
obviously reduce the friction and wear of the composites and the
effectiveness of the water lubrication is closely related to the
characteristics of the composites. The differences in the effectiveness
of water lubrication and the structure of UHMWPE/Kaolin account for the
different friction and wear properties of the two kinds of composites.
Key words: UHMWPE Composite Kaolin Tribological behavior Wear
mechanism Water lubrication
CLC No: TQ325.4
国家自然科学基金(50005019)和国家“863”计划(2002AA424052)资助项目.
Received 20020830, received in revised form 20021002
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