In your opinion, which are the metals that are mostly used on friction materials nowadays?
Imagine we had the opportunity to do a massive survey asking this question to friction industry formulators.
They’d surely answer iron in first place, probably followed by copper, zinc, tin, maybe aluminium…But presumably not bismuth! It sounds quite an exotic metal, isn’t it? If you think this metal is more present in investigation laboratories rather than in industrial massive plants, you’d better leave the twentieth century behind and go deep in the environmental trends of 2020’s.
It is true nevertheless, bismuth had few commercial applications at the beginning of the century, and those applications that use it generally require small quantities relatively to other raw materials.