Particle Size Effects of Tin Sulfides in Disc Brake Pads
1 Modern organic bonded friction linings contain both tin-(II)-sulfide and tin-(IV)-sulfide as solid lubricants. Due to their chemical and physical properties tin sulfides act as friction stabilizers and improve wear of disc and pad or lining not only in low steel and non-steel formulations but also in semimetallics. The influence of the particle size distribution in disc brake pads was investigated systematically. In the first run different particle size grades of tin sulfides were prepared: large particle, technical, fine and super fine grade. The medium diameter (D 50), surface and sieve residues were determined by using international standard testing methods. The thermal properties of the pure grades were investigated by DSC/TGA showing that the particle size distribution influences oxidation kinetics. The decomposition behavior was determined in inert atmosphere applying the same measurement system.