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Study on the Tribological Properties of PTFE-Based Composits Meterials under Vacuum and Cryogenic Conditions

Author: ShangQuan
Tutor: SongBaoYu
School: Harbin Institute of Technology
Course: Mechanical Design and Theory
Keywords: PTFE Vacuum Low temperature Friction and Wear
CLC: TB332
Type: Master's thesis
Year: 2009
Downloads: 130
Quote: 1
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Abstract


Polytetrafluoroethylene (PTFE) has the characteristics of excellent chemical stability, high and low temperature-resistant and self-lubricating properties, but has less wear-resistant performance. Filled in PTFE with solid lubricants, metal powder, metal sulfides and so on, the PTFE-based composite materials wear resistance has improved greatly, which has become a indispensable material in the aviation field. However, It is lack of the tribological data friction under harsh conditions such as low temperature and vacuum. in view of this situation this document following work:The PTFE-based composite materials which were made by the author were studied. The vacuum and low-temperature friction laboratory table was also studied by improving its loading system and algorithm. The effect of different proportions of additive such as plumbaginous|, MoS2, SiC, Cu and tombar thite Nd2O3 and so on to the tribological performance of the composite materials was examined followed with the analyzing of the friction and wear mechanism.The paper first analyzed the influence of friction and attrition performance of the PTFE compound materials which was modified by the graphite and MoS2,then analyzed the coefficient and quality of the friction and wear of different components of plumbaginous and MoS2 individual and collective cffect in normal temperature and pressure conditions to the PTFE. As well as has carried on tribology experiment that SiC, Cu and Nd2O3 fills separately modified 8% graphite +3%MoS2+PTFE four PTFE base compound materials in the different vacuum degree and under the vacuum low temperature condition. The results show that: in low temperatures and vacuum conditions, the friction coefficient of ternary and quaternary PTFE-based composite materials increases with temperature reduces; the friction coefficient of PTFE-based composite materials increases with vacuum increases, except for the one filled with rare-earth SiC; the friction coefficient of PTFE-based composite materials decreases with the speed and decreases with the inecreased load, in low-temperature vacuum conditions, adhesive wear is the main cause of the PTFE PTFE-based composite materials wear; the exist of PTFE-based composite material transfer film effectively prevent the composite material and dual parts direct contact; the joining of plumbaginous|, MoS2, SiC, Cu and tombar thite Nd2O3 and so on enhances the dimensional stability, hardness and the formation of transfer film, reduces the mechanical deformation, promotes the formation of transfer film and reduces the PTFE-based composite material’s wear.

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