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Design and Tribological Properties of the Environment-friendly Three-layer Composites

Author: WenDanDan
Tutor: JiaoMingHua
School: Hefei University of Technology
Course: Mechanical Design and Theory
Keywords: PTFE PEEK Three-layer composite material Friction Wear and tear Environmental protection
CLC: TB33
Type: Master's thesis
Year: 2010
Downloads: 48
Quote: 1
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Abstract


The three-layer composite material as a special self-lubricating composite materials show excellent friction and wear performance in the non-oil lubrication or oil difficult conditions has been more widely used. But PTFE three composite surface composition contains a lot of lead to the environment pollution problem has become more and can not be ignored, three composite of unleaded or less of lead production is imminent. Selected PTFE and PEEK matrix as three composite surface, its lead-free the modified formulation design, and systematic study of the friction and wear behavior. Papers draw the following main conclusions: 1, taking into account the three composites plasticized sintering process has an important impact on friction and wear properties of the material, therefore, the paper first three plasticized composite sintering process in more detail. studies, including the sintering temperature, holding time and cooling method of the sheet, after the experimental optimization, the best plasticized sintering process. 2, the recipe on the lead-free three-layer composite material is mainly studied the surface polymers of various fillers, and found that the role played by the various fillers in different surface polymer different. Enhanced filler Ekonol (1) the purpose of unleaded PTFE three-layer composite material, the improvement of the friction and wear properties better than fiberglass and carbon fiber effect; solid lubricant molybdenum disulfide filled PTFE three-layer composite material the best effect when the filling material is better than that of graphite, wherein the molybdenum disulfide has a content of 5%; resin filler, PI than the PPS, PEEK reinforcing effect is better, wherein the PI content of 20% lead-free PTFE three-layered composite material friction and wear properties. (2) in terms of the three-layer composite of unleaded PEEK, graphite filling effect is better than molybdenum disulfide, and 5% graphite content friction and wear properties of the material best; PEEK three layers of graphite-filled composite material add fiberglass or PTFE friction and wear tests and found that the two materials are largely improve the friction and wear properties and load carrying capacity of the PEEK three-layer composite materials, which fill fiberglass material more than filled PTFE material effect tribological properties of prominent, glass fiber content of 15% under dry friction exhibited the best tribological properties of glass fiber content of 20% in oil lubrication conditions. Wear mechanism analysis showed that: the filled resin filler PPS, PEEK, PI environmentally friendly PTEF base three-layer composite material under conditions of dry friction mainly adhesive wear, micro-cutting wear; pure PEEK surface in three-layer composite material presents severe adhesive wear under dry friction; of filling PTFE and graphite, fiberglass and graphite environmentally friendly PEEK-based three-layer composite material in dry friction conditions wear manifestations wear Adhesive wear micro-cutting; under oil lubrication conditions, whether it is a surface of pure PEEK three three composites or filled PTFE or glass fiber composite, the wear mechanisms are fatigue wear. 4, this article unleaded PEEK three-layer composite material, regardless of the carrying capacity or friction and wear characteristics are superior quality leaded material on the market; performance of lead-free PTFE three-layer composite material is also much better than the ordinary leaded three composite materials.

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