Tribological behavior of MC Nylon6 composites filled with glass fiber and fly ash

Abstract

To improve tribological property of MC Nylon6, the glass fiber and fly ash reinforced monomer casting nylon composites (GFFAPA) were prepared by anionic polymerization of ɛ-caprolactam. The friction and wear behaviors of composites under dry condition, water lubrication and oil lubrication were investigated through a ring-black wear tester. Worn surfaces were analyzed using a scanning electron microscope. The experimental results show that the tensile strength and hardness of nylon composites are obviously improved with reinforcement increasing. Compared to MC nylon, the lowest friction coefficient and wear rate of glass fiber reinforced nylon composites (GFPA) with GF30% respectively decrease by 33.1% and 65.3%, of fly ash reinforced nylon composites (FAPA) with FA20% decrease by 5.2% and 68.9% and of GFFAPA composites with GF30% and FA10% decrease by 57.8% and 89.9%. The main wear mechanisms of FAPA composites are adhesive and abrasive wear and of GFPA composites with high proportion are abrasive and fatigue wear. The worn surfaces of GFFAPA composites are much multiplex and the optional distributing glass fiber and fly ash have a synergetic effect on the wear resistance for GFFAPA composites. Compared with dry friction, the friction coefficient and wear rate under oil lubricated conditions decrease sharply while the latter reversely increase under water lubricated conditions. The wear mechanisms under water lubricated condition are principally chemical corrosion wear and abrasive wear and they become boundary friction under oil lubricated condition.

Keywords

nylon6 / composite / tribology / friction / wear

References

[1] Bahadur S., PoIineni V.K. Tribological Studies of Glass Fabric-reinforced Polyamide Composites Filled with CuO and PTFE [J]. Wear, 1996, 200: 95-104.

[2] Goshawk J.A., Jones R.S. Structure Reorganization During the Rheological Characterization of Continuous Fibre-reinforced Composites in Plane Shears [J]. Composites: Part A, 1996, 27A: 279-286.

[3] Hammel A.E., Tang A.X., Trampert A.M. Carbon Nanofibers for Composite Applications [J]. Carbon, 2004, 42: 1153-1158.

[4] Ge S.R., Wang W.H., Wang J.X. Investigation of the Tribological Properties of Glass Fiber Reinforced Polyamide-1010 Composits [J]. Tribology, 2000, 20: 427-430.

[5] Li G.L., Liu J.H., Hu Y., . Tribology and Thermal Properties of Glass Bead Modified Oil Filled MC Nylon [J]. Materials for Mechanical Engineering, 2005, 29: 41-45.

[6] Wan J.X., Gu M.Y. Investigation of CaF₂ Filler and Carbon Fiber on the Tribological Properties and Wear Mechanisms of Nylon1010 Composites [J]. Polymer Materials Science and Engineering, 2005, 21: 184-188.

[7] Suk H.Y., Donghwan C.H.O. Effect of Silane Coupling Agents with Different Organo-functional Groups on the Interfacial Shear Strength of Glass Fiber/Nylon 6 [J]. Composites, 2003, 22: 1 591-1 594.

[8] Sudarshan Surappa M.K. Dry Sliding Wear of Fly Ash Particle Reinforced A356 Al Composites [J]. Wear, 2008, 265: 349-360.

[9] Hua J., Li A.D.Y., Llewellyn R. Computational Investigation of Microstructural Effects on Abrasive Wear of Composite Materials [J]. Wear, 2005, 259: 6-17.

[10] Kanga S.C., Chung D.W. Improvement of Frictional Properties and Abrasive Wear Resistance of Nylon/Graphite Composite by Oil Impregnation [J]. Wear, 2003, 254: 103-110.

[11] Jiaa X., Lingb X.M. Influence of Al2O3 Reinforcement on the Abrasive Wear Characteristic of Al₂O₃/PA1010 Composite Coatings [J]. Wear, 2005, 258: 1342-1347.

[12] Dasari A., Yu Z.Z., Mai Y.W. Clay Exfoliation and Organic Modification on Wear of Nylon 6 Nanocomposites Processed by Different Routes [J]. Composites Science and Technology, 2005, 65: 2 314-2 327.

[13] Hooke C.J., Kukureka S.N., Liao P., . Wear and Friction of Nylonglass Fibre Composites in Non-conformal Contact under Combined Rolling and Sliding [J]. Wear, 1996, 197: 115-122.

[14] San J., Wang Z., Li S.H. Nano-hardness and Wear Properties of C-implanted Nylon 6 [J]. Surface & Coatings Technology, 2006, 200: 5 245-5 252.

[15] Zheng L.Y., Zhao L.X., Zang J.J. Friction and Wear Properties of Threedimensionally Braided Carbon Fabric-reinforced Nylon Composites [J]. Letters to the Editor/Carbon, 2006, 44: 161-164.

[16] Mo Y.M., Pan Y.P., Wang X.M. The Tribological Properties of the Hotextrusion Nylon Coating in the Oil Well Environment [J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2003, 18: 58-60.