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Study on Tribological Properties of UHMWPE Composites Filled with CSW

Author: GanLiHui
Tutor: NiuYongPing
School: Henan University of Science and Technology
Course: Polymer Chemistry and Physics
Keywords: UHMWPE Filled Calcium sulfate whisker Nano- Al2O3 Synergy Friction and wear
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 74
Quote: 2
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Abstract


Ultra-high molecular weight polyethylene (UHMWPE) has excellent self-lubricating properties, chemical resistance and good wear resistance, is an integrated performance engineering plastics. But as a friction material, UHMWPE exist low surface hardness Abrasive poor performance and other shortcomings. This thesis work has elected to calcium sulfate whisker (CSW) as the main filler for UHMWPE were filled with modified in order to improve the hardness of UHMWPE composite materials on the basis of improving their friction and wear properties. The experiments were prepared by hot pressing molding method of CSW, nano-alumina (nano-Al 2 O 3 ) and nano-Al 2 O 3 / CSW binary complex filler UHMWPE composites; using the QG-700-type atmosphere temperature friction and wear tester investigated UHMWPE composites under dry sliding friction and wear properties, focusing on the filler filler content of the composite material hardness, friction and wear properties, as well as speed, surface modifiers on UHMWPE composite friction and wear properties. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), three-dimensional contour measuring instrument (3D) surface friction of the composites were characterized by morphology, composition analysis and wear scar width measurement, measured with a Shore hardness of composites surface hardness. The results showed that: (1) CSW can improve the UHMWPE / CSW composite material hardness, wear resistance, and reduce the coefficient of friction, in the present experimental conditions, CSW optimum filler content of 20%; as the speed increases, The wear rate of the composite material decreases, the friction coefficient increases; as filling increases, the composite material is abraded machine ground adhesion wear, plastic deformation gradually transformed into mild abrasive wear; CSW in UHMWPE matrix phase has a certain nucleation. (2) filled with nano-Al 2 O 3 UHMWPE composites can serve to increase the hardness and reduce the friction coefficient and improve the role of friction and wear properties, nano-Al 2 O 3 preferred filler content of 20%, microscopic analysis showed that, UHMWPE / nano-Al 2 O 3 composite the wear mechanism of adhesive wear, there is a small amount of wear surface scratches. (3) nano-Al 2 O 3 and CSW synergistic blend filled UHMWPE, UHMWPE composites can collaborate to improve the hardness and wear resistance. Plays a major role in carrying CSW, nano-Al 2 O 3 is played microscopic dispersion strengthened composites reinforced role. UHMWPE / 3% nano-Al 2 O 3 20% CSW friction and wear properties of composites best surface in the dual existence of a good transfer film. These results show that the appropriate choice of filler is an improvement collaborative Filled UHMWPE good tribological properties of composite materials, it is worth further study.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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