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Ceramic Brake Discs

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by

Harry Ovey

on 12 December 2012

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Transcript of Ceramic Brake Discs

Ceramic brake pads offer great braking performance, wear well over time and are very lightweight -- all of which are important for high-performance driving. Structure Of Ceramic Brake Pads Property Unit Carbon Ceramic Brake Disk Grey Cast Iron
Density g cm-3 1.8-2.9 7.25
Tensile Strength MPa 10-240 200-250
Modulus of Elasticity GPa 20-240 90-110
Thermal Stability C 1350 approx 700
Thermal Conductivity W m-1K-1 20-150 54
Heat Capability kJkg-1K-1 0.6-1.7 0.5 Comparison between Carbon Ceramic material and Gray Cast Iron Ceramic brake pads are made from ceramic fibers, filler material, bonding agents and they may even have small amounts of copper fibers within them as well. Because they're mostly ceramic, these brake parts dissipate heat well, which keeps performance strong, even after repeated hard stops. They also don't break down very much with repeated use; that means they produce less dust than other types of brake pads -- and the dust that they do produce is lighter in color and doesn't stick to the wheels Ceramic Brakes in Porsche Porsche's Composite Ceramic Brakes (PCCB) are siliconized carbon fiber, with very high temperature capability, a 50% weight reduction over iron discs (therefore reducing the unsprung weight of the vehicle), a significant reduction in dust generation, substantially increased maintenance intervals, and enhanced durability in corrosive environments over conventional iron discs. Found on some of their more expensive models, it is also an optional brake for all street Porsches at added expense. It is generally recognized by the bright yellow paintwork on the aluminum six-piston calipers that are matched with the discs. The discs are internally vented much like cast-iron ones, and cross-drilled. Ceramic pads meet or exceed all original equipment standards for durability, stopping distance and noise. According to durability tests, ceramic compounds extend brake life compared to most other semi-metallic and organic materials and outlast other premium pad materials by a significant margin - with no sacrifice in noise control, pad life or braking performance. Production The secret of the advantages of the carbon-ceramic brake disk is the unique production process over approximately 20 days. To produce carbon-ceramic brake disks, we use carbon fibers which are given a special protective coating and then cut into short fiber sections of defined thickness and length. The production process includes preparation of the fiber mixture, the production process for the disk body and the bell mounting as well as the final machining of the assembled brake disk. The entire production process is monitored with various tests and ends with one final testing. The production process of the ceramic brake body continues with a preform pressed with binding resin to a so called green body which will be converted in the ceramic component by carbonizing at 900 °C and siliconizing at 1700 °C in high vacuum. The complex feature of the manufacturing process is the use of the “lost core” technology – a plastics matrix which defines the design of the cooling vane geometry and which burns out without residues at carbonizing – as well as the different fiber components of the brake disk body, the friction layers on the ring exterior side and the point-shaped abrasion indicators which are integrated into the friction layer. Fiber Reinforced Composites Common fiber reinforced composites are composed of fibers and a matrix. Fibers are the reinforcement and the main source of strength while the matrix 'glues' all the fibers together in shape and transfers stresses between the reinforcing fibers. Sometimes, fillers or modifiers might be added to smooth manufacturing process, impart special properties, and/or reduce product cost. Bibliography + Howstuffworks.com
+ tirerack.com
+ sglgroup.com
+http://www.efunda.com/formulae/solid_mechanics/composites/comp_FRC_intro.cfm
+http://www.sciencedirect.com/science/article/pii/S1359836811001235 Thanks For Watching!! This is a stress strain graph for cast iron.
To find the Young's Modulus of Cast Iron I divided the change in stress be the change in strain.
YM=50/8*10^-4
=62500 Pa
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