Why phosphor Bronze is used in Flat Washer and how it help?
Phosphor bronze is an alloy of copper with 3.5 to 10% of tin and a significant phosphorus content of up to 1%. The phosphorus is added as deoxidizing agent during melting. These alloys are notable for their toughness, strength, low coefficient of friction, and fine grain. The phosphorus also improves the fluidity of the molten metal and thereby improves the castability, and improves mechanical properties by cleaning up the grain boundaries. Further increasing the phosphorus content leads to formation of a very hard compound Cu3P (copper phosphide), resulting in a brittle form of phosphor bronze, which has a narrow range of applications. Sources: http://en.wikipedia.
