Abstract

The mechanical properties of PTFE 100%, PTFT 90% + carbon black 10%, PTFE 85% + glass fiber 15%, PTFE 80% + glass fiber 15% + molybdenum disulfide ($MoS_2$) 5%, PTFE 75% + glass fiber 25%, and PTFE 75% + carbon black 18% + graphite 7% composites were investigated in this study. The differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to examine the heat of fusion(${\Delta}H_f$) and thermal stability of the composites. Also, the wear surface and wear volume of PTFE lip seal were examined using the durability test. Wear surface was observed using scanning electron microscope (SEM). It was found that the hardness, wear resistance and durability were enhanced by adding glass fiber and molybdenum disulfide into pure PTFE, but tensile strength and elongation were decreased. According to the experimental results, the composite (PTFE + 15% glass fiber + 5% molybdenum disulfide) showed the best properties for applying to oil-seal among six types of PTFE composites.

Keywords

• polytetrafluoroethylene(PTFE);
• reinforcement filler;
• oil-seal;
• tribology;
• morphology

File

Download PDF

Acknowledgement

Grant : 자동차엔진의 경량화 및 내구성 향상을 위한 PTFE engine seal 개발

Supported by : 지식경제부

References

1. 나윤환, 류병진, 김청균, "오일시일의 마찰 특성에 관한 실험적 연구", 한국윤활학회지, 14, 21 (1998).
2. 김용직, 엄두현, 김윤배, "PTFE 복합재료의 마찰, 마모 특성에 미치는 첨가재의 영향", 한국복합재료학회 99추계 학술발표대회 논문집, 88 (1999).
3. 이한영, "철강재료 위 coating된 PTFE 막층의 미끄럼 마찰 마모 특성 연구", 윤활학회지, 24, 96 (2008).
4. 이길근, 김우열, "가압소결에 의한 PTFE/A1 복합재료 제조", 한국분말야금학회지, 9, 103 (2002)
5. 김명식, 홍진원, 배규식, "PTFE 및 W 첨가가 Ni-P 도금의 내 마모 특성에 미치는 영향", 반도체 및 디스플레이 장비 학회지, 6, 25 (2007).
6. D. B. Giuseppe, O. Michel, P. Geoge, and S. Aleksander, "Film thickness prediction of radial lip seal", FME Transactions, 37, 87 (2009).
7. Yuichi Kuroki, NOK technical report, 4, 237 (1991).
8. 신홍철, 김성철, 조을룡, "이축 연신 PTFE 막 제조 공정에 관한 연구(I)", 엘라스토머, 42, 86 (2007).
9. 신홍철, 김성철, 조을룡, "이축 연신 PTFE 막 제조 공정에 관한 연구(II)", 엘라스토머, 42, 137 (2007).
10. X.-H. Cheng, Y.-J. Xue, and C.-Y. Xie, "Friction filled PTFE composites in dry reciprocating sliding motion with impact loads", Wear: an international journal on the science and technology of friction, lubrication on wear, 253, 869 (2002).
11. Z-Z. Zhang, Q.-J. Xue, and W.-M. Liu, "Friction and wear properties of metal powder filled PTFE composites under oil lubricated conditions", Wear: An international journal on the science and technology of friction, lubrication on wear, 210, 151 (1997).
12. J.-Y. Lee, and D.-S. Lim, "Tribological behavior of PTFE film with nanodiamond", Surface & Coatings Technology, 188/189, 534 (2004). https://doi.org/10.1016/j.surfcoat.2004.07.102
13. Y. Shi, X. Feng, and H. Wang, "The effect of surface modification on the friction and wear behavior of carbon nanofiber- filled PTFE composites", Wear: An international journal on the science and technology of friction, lubrication on wear, 264, 934 (2008).
14. J. Y. Lee, P. P. Lim, and D. S. Lim, "Tribological behavior of PTFE nanocomposite fillms reiforced with carbon nanoparticles", Composites, Part B, Engineering, 38, 810 (2007). https://doi.org/10.1016/j.compositesb.2006.12.006
15. K. C. Rusch and R. W. Sanderson, "Frictional losses of dual- material lip-type shaft seals", 26th ASLE Annual Meeting, Bostone Massachusetts, 213 May (1971).
16. 김청균, 전인기, 심우전, 김종억, "립실의 접촉력 및 온도분포에 관한 연구", 대한기계학회 논문집, 18, 1559 (1994).
17. 김청균, "고무재 오일실의 응답특성에 관한 해석적 연구", 한국윤활학회지, 12, 42 (1996).
18. E. Parti, "Behavior of elastomeric lip seals subjected to shaft radil vibrations including tnertial effects", Inf. Eng. Chem. Prod. Res. Dev., 24, 263 (1985). https://doi.org/10.1021/i300018a018
19. Parti, E., "Dynamic behaviour of radial lip seals under effect of shaft eccentricity", Proc. 10th Int. Conf. on Fluid Sealing, BHRA, Innsbuck, Paper C3, 123 (1984).