Temperature dependence of friction and wear performance and thermomechanical response of flyash-filled brake composites

Abstract

Flyash-filled glass fibre reinforced composites have been fabricated and evaluated for drag braking performance on a chase friction testing machine following SAE J 661a standard. The friction build-up and decay phenomena in the drag braking mode as a function of drum temperature have consistently been found to be in the composites with ∼5−7.5 wt% of glass fibres, whereas the absolute friction effectiveness remained higher in the composites with maximum flyash/maximum glass fibre contents. Temperature-dependent friction performance remained broadly composition specific and qualitative correlations of performance to compositional attributes have been found to be complex. Topographical variations and their possible roles in controlling the tribological performance have been characterized by worn surface morphology. Scanning electron microscopy–energy dispersive X-ray combined analysis have revealed that at higher amount of glass fibre content in combination with flyash, the composite exhibited enhanced noise and judder propensity apart from higher Fe-content deposition on friction film. The energy dissipation ability modes as revealed from dynamic mechanical analysis showed not only a correspondence between the damping ability of the composites and compositional variations but also qualitatively established a correlation between wear and storage moduli.

Keywords

Friction material flyash fade wear

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References

Ramme BW, Noegel JJ and Rohatgi PK. Separation of cenospheres from flyash. Patent 20080190327, USA, 14 August 2008.

Pan J, Naerheim Y and Liao TTL. Brake pad lining filler material. Patent 20030055126, USA, 20 March 2003.

Malhotra

Valimbe

Wright

. Effect of flyash and bottom ash on the frictional behaviour of composites. Fuel 2002; 81: 235–244.

Mohanty

Chugh

. Development of flyash based automotive brake lining. Tribol Int 2007; 40: 1217–1224.

Hee

Filip

. Performance of ceramic enhanced phenolic matrix brake lining materials for automotive brake linings. Wear 2005; 259(7–12): 1088–1096.

Jacko

Tsang

PHS

Rhee

. Wear debris compaction and friction film formation of polymer composites. Wear 1989; 133: 23–38.

Rhee

. Wear equations for polymers sliding against metal surfaces. Wear 1970; 16: 431–445.

Eriksson

Jacobson

. Tribological surfaces of organic brake pads. Tribol Int 2000; 33: 817–827.

Osterle

Urban

. Third body formation on brake pads and rotors. Tribol Int 2006; 39: 401–408.

10.

Osterle

Urban

. Friction layers and friction films on PMC brake pads. Wear 2004; 257: 215–226.

11.

Dadkar

Tomar

Satapathy

. Evaluation of flyash-filled and aramid fibre reinforced hybrid polymer matrix composites (PMC) for friction braking applications. Mater Des 2009; 30: 4369–4376.

12.

Dadkar

Tomar

Satapathy

. Performance assessment of hybrid composite friction materials based on flyash-rock fibre combination. Mater Des 2010; 31: 723–731.

13.

Gopal

Dharani

Blum

. Hybrid phenolic friction composites containing Kevlar pulp. Part I. Enhancement of friction and wear performance. Wear 1996; 193: 199–206.

14.

Idicula

Malhotra

Joseph

. Dynamic mechanical analysis of randomly oriented intimately mixed short banana/sisal hybrid fibre reinforced polyester composites. Compos Sci Technol 2005; 65: 1077–1087.