FRICTION, TEMPERATURE, AND WEAR ANALYSIS FOR CERAMIC COATED BRAKE DISKS

Coating adherence, friction coefficient, surface temperature, and wear mass loss are determined for a set of scale reduced steel brake disks on which NiCr cement based coatings and low conductivity subcoatings are plasma sprayed. The related pads are made of either sintered iron copper or sintered aluminum titanate. It is mainly shown that NiCr-Cr3 C2 cermet coating on the disk, coupled with sintered aluminum titanate pad, leads to good damage resistance and stable friction coefficient in the simulation of high speed train braking. Low conductivity sublay ers are also involved and it is found that temperatures in disc or pad may be also controlled.