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The Effect of Rotor Metallurgy on Brake Performance and Wear Resistance
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English
Abstract
Improvements in disc brake friction and wear characteristics are usually sought by alternating the disc pad composition or processing conditions. This study investigated the effects of varying the cast iron rotor chemistry and microstructure on the performance and wear resistance of a disc brake composed of such rotors and standard commercial semi-metallic disc pads. A statistical design of an engineering experiment was used to determine such effects of five chemical variables of the cast iron rotor -- C, Si, Mn, P and Ti -- and two processing variables -- solidification and cooling rates. An increase in manganese or phosphorus content improved brake performance and decreased pad wear, compared to a standard chemistry cast iron. Cast irons with high titanium or carbon levels showed low friction and high pad wear. Improved performance but high pad wear were found for cast irons with high silicon contents. A fast liquid solidification rate or a fast solid cooling rate significantly reduced pad wear without influencing performance. The changes in rotor chemistry in the present study did not seem to affect the rotor wear, however.
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Authors
Citation
Coyle, J., Tsang, P., and Johnson, T., "The Effect of Rotor Metallurgy on Brake Performance and Wear Resistance," SAE Technical Paper 830533, 1983, https://doi.org/10.4271/830533.Also In
References
- Rhee, S. K. “Influence of Rotor Metallurgy on the Wear of Friction Materials in Automotive Brakes,” SAE Paper 710247 , SAE Automotive Engineering Congress, Detroit, Michigan, January 1971. Also in SAE Transactions , Vol. 80, Society of Automotive Engineers, Warrendale, Pennsylvaia 1971
- Rhee, S. K. DuCharme R. T. Spurgeon, W. M. “Characterization of Cast Iron Friction Surfaces,” SAE Paper 720056 , SAE Automotive Engineering Congress, Detroit, Michigan January 1972
- Libsch T. A. Rhee, S. K. “The Effects of Compositional Variations in Heavy Truck Rotors Upon Rotor and Pad Wear,” Wear of Materials 1981 American Society of Mechanical Engineers New York, New York 1981 343 350
- Hatch, D. “Cast Iron Brake Discs,” The Journal of Automotive Engineering 3 39 October 1972
- “Road to Efficient Research,” Industrial Chemical News July 1981 21 22
- Hendrix, C. D. “What Every Technologist Should Know About Experimental Design,” Chemtech March 1979 167 174