Development of Iron Based Brake Friction MMC Used for Military Aircraft Application by A New P/M Route

Mohammad Asif, K. Chandra, P.S. Misra

Metallurgical and Materials Engineering Department, Indian Institute of Technology, Roorkee.Roorkee- 247667, India.

DOI: 10.4236/jmmce.2011.108054                

Abstract

A new P/M route based hot powder pre-form forging process has been evolved to develop high density brake materials for heavy duty applications. Number of iron based MMC’s so developed offer better characteristics for braking applications in comparison to the materials developed through conventional P/M route based on high pressure compaction and pressure sintering. The process so developed in the present investigations is much simpler and easy to adopt by existing P/M industries. Hot powder pre-form forging technique for making heavy duty brake pads offers better opportunity for pore free material with better bonding between various metallic and non-metallic constituents. After conducting an initial characterization such as hardness, density and Pin-on Disc tests, the samples were tested for high energy (32,933kgfm) on Sub-scale dynamometer under Rejected Take Off conditions. The results have also been compared with respect to brake pads employed in heavy duty Military aircraft tested under identical laboratory conditions. The present work indicates that the newly developed materials compare better than the one being currently employed in heavy duty aircraft. The reasons for better performance are improved processing technique and resulting higher levels of density and improved binding of the product.

Keywords

brake pad; heavy duty Aircraft brakes; Powder Metallurgy.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Anderson, A. E., 1992, ASM Handbook, Vol.18, pp569-577, Materials park, OH.
[2]	Hausner, H., 1970, Vol.4, pp61-72 & pp123-137, Perspectives in Powder Metallurgy, Friction and Anti-friction materials, Plenum press, New York.
[3]	Nadezda, M. et. al., 2000, Materials Letters Vol.46, pp255–260.
[4]	So H., 1996, Tribology International Vol.29, pp415-423.
[5]	S. D. Lenin., Chandra K., Misra P. S., 2009, “New Processing Technology for the Manufacture of Heavy duty Metallo-Ceramic Brake pads” Powder Metallurgy, p6.
[6]	Misra P. S., Chandra K. “Development of High Temperature Oxidations Resistant Glassy Coating” Indian Patent, application No. 153/DEL/2010 dated Jan. 27, 2010.
[7]	S. D. Lenin., Development of friction materials through powder metallurgy, 2008. Ph.D. Thesis, Indian Institute of Technology Roorkee (INDIA).
[8]	Asif M., Chandra K., Misra P. S., 2010 “Characterization of hot powder preform forged Iron Based brake pads for heavy duty applications” paper under review ASME Journal of Tribology, No TRIB-10-1178.
[9]	Asif M., Chandra K., Misra P. S., 2010, “Microstructure and Mechanical Properties of P/M Processed steel used in brake pads for heavy duty applications by hot powder preform Technique.” Paper accepted and will be published in Material science and Engineering- A, Elsevier journal, for Third International Conference on Recent Advances in Composite Materials, ICRACM-2010 France (December 13-15, 2010).