C/C-SiC composite brake disks

Aaretti KalevaSam Ziadeh

Contents :•Introduction•Efficient braking•Brake disk materials•C-C/SiC Brake disks•Developement of ceramic brake disks•Manufacture•Quality control•Cost•Conclusion

Introduction

Important factors that are required:High speed ,powerful engine and Safety measures.Brake system should be able to stop the vehicle within the smallest possible distance.(safety) .

converting kinetic energy into heat energy.

Efficient braking

• High Coefficient of Friction – Brake pad material and disc material

• Stable Coefficient of Friction– Sufficient heat conductivity

Brake disk materials

Cast iron brake diskHeavy weight , poor wear resistance

Carbon brake diskHigh heat resistanceLow wear resistance ,poor oxidation resistence

C-C/SiC Brake Disks

Light weight High wear and

corrosion resistance High thermal shock

resistance High strength at

higher temperatures

Development

1. Generation discs were toughned with woven carbon fiber fabrics•Inadequate transverse heat conductivity2. Generation discs have short high-modulus carbon fibers•Good transverse heat conductivity•Good strenght

Manufacutre of C/C-SiC insport cars

Materials Preparation

carbon fibers (reinforcement)

silicon carbide and metallic

silicon (matrix)

main component,

assures great hardness

high mechanical strength

resistance,  fracture

toughness 

Quality ControlNDE Methods:penetration technique ultrasonic testingX-ray analysis

Cost

• High price of carbon ceramic brake disks is probably the most restricting reason why they are not more widely used, calculations by DLR Company, manufacturing cost 350 Euro.

ConclusionBenefits of CMC brake disks

– High and consistent frictional coefficients– Weight advantage over conventional cast iron components

(65%)– Not affected by corrosion– Long life span

due to its advantages over the conventional brake disc CMC are going to be the brake disc for cars in the future. With the success of e.g. Porsche turbo car, many other racing cars and commercial vehicles are going to implement CMC in cars.

References:• http://

www.automobilemag.com/features/news/1007_carbon_ceramic_brembo_brake_rotors/creation.html

• http://www.sglgroup.com/cms/international/products/product-groups/bd/carbon-ceramic-brake-disks/index.html?__locale=en

• http://www.autoguide.com/auto-news/2012/10/why-you-should-or-shouldnt-upgrade-to-carbon-ceramic-brakes.html

• Walter Krenkel, Bernhard Heidenreich , Ralph Renz . 2002. C/C-SiC Composites for advanced Friction Systems. Advanced engineering materials, 4, No.7. Germany.

• Manish Patel, Kumar Saurabh, VV Bhanu Prasad and J Subrahmanyam. 2012. High temperature C/C–SiC composite by liquid silicon infiltration. Defence Metallurgical Research Laboratory, Hyderabad. India.