Carbon-Ceramic Brakes

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Carbon-Ceramic Brakes

• Josué De Lara Bashulto
• MEEN 3344

Photo Credit http// news.caradisiac.com
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Carbon Fiber Reinforced Silicon Carbide (C/SiC)

• C/C Brakes were introduced in aircraft
• Suffered serious dissadvantages ?
• Low coefficient of friction below 450 C
• High rate of wear for the pads
• C/C-SiC
• Woven carbon reinforced carbon core material
• Thin surface layer of SiC

ImageZ. Stadler/Journal of the European Ceramic
Society(2006)
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Manufacture

• Preparation of a C/C composite core
• Liquid silicon infiltration
• Vacuum
• High temperature
• SiC layer is formed on the surface of C/C core
• Grinding of the sliding surface of disk

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Benefits

• High and consistent frictional coefficients (even
  with high thermal stress)
• High efficiency on a functional temperature range
• Weight advantage over conventional cast iron
  components (65)
• Reduction of unsprung mass (5 Kg/wheel)?
  exceptional driving behavior
• Not affected by corrosion
• Superior response in all driving conditions
• Long life span ( in excess of 300,000 Km)
• No disk distortion or judder
• Early and consistent brake response
• Reduction of the stopping distance

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Applications

• Super-sport vehicles
• Luxury SUVs
• Aircraft
• Elevators
• Trains

Image credit R. L. Hecht, Materials Science
Department, Ford Research Laboratory
Image credit Continental Teves
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References

• Choi, Ji-Hoon, Jae-Hung Han, and In Lee.
  Transient Analysis of Thermoelastic Contact
  Behaviors in Composite Multidisk Brakes. Journal
  of Thermal Stresses, 27 1149-1167,2004.
• High Performance Automotive Brakes. 28 Sep.
  2006. SGL Technologies Website. 2005
• http//www.sglcarbon.com/sgl_t/brakedisc/index.ht
  ml
• Stadler, Zmago, Kristoffer Krnel, and Tomaz
  Kosmac. Friction behavior of sintered metallic
  brake pads on a C/C-SiC composite brake disk.
  Journal of European Ceramic Society (2006)
  doi10.1016/j.jeurceramsoc.2006.04.032