Influence of Steel Fiber on Thermal Stability and Thermal Conductivity in a Semi Metallic Disc Brake Pad Formulation
Thermal conductivity and thermal stability plays a vital role on the performance of NAO brake pads . The Steel fiber a semi metallic composition is carried out in this paper to prepare the Non Asbestos Brake Pad. Steel fiber has good thermal stability and bulk density. So the optimization of steel fiber percentage for thermal behaviour is considered using TGA. The temperature rise during brake application will be between 150-4000 C and this zone of temperature is very critical to determine the fade characteristics during friction testing. Less weight loss between 150 – 400°C during TGA testing means that it is a better thermally stable product. Hence, three different friction composites were developed with same formulation varying the steel fiber content with the inert filler namely barites and designated as NA01, NA02 and NA03 respectively. After the fabrication of the friction composites, the TGA test revealed that the composite NA01 had minimum weight loss during 160 - 4500 C. The composites were then tested for Tribo performance using Constant speed testing machine following SAE J 661a standards. Thus we can correlate the thermal stability with the stability of friction based on minimum weight loss using TGA testing. Hence composite NA01 proved to be the best performer.On another aspect the NA01 has more rotor wear when compared to the other composition in that aspect of rotor wear NA03 is best.
V. Thiyagarajan and K. Kalaichelvan, "Influence of Steel Fiber on Thermal Stability and Thermal Conductivity in a Semi Metallic Disc Brake Pad Formulation", Advanced Materials Research, Vols. 622-623, pp. 1545-1549, 2013