The hardness of silver copper alloy is higher than that of silver, its conductivity and thermal conductivity are better than those of other alloys, and its price is low. This alloy, including contact materials, has been widely used in practice. There are many brands of silver copper alloy, 92.5% silver copper alloy is called silver alloy, 90% silver copper alloy is called seigniorage alloy, 71.9% silver copper is called eutectic alloy, and 10% silver copper alloy is called hard silver. In the field of the use of small current, the alloy can be used as a sliding contact of the commutator and the rotating switch of the micro motor. It can be used in the equipment with large contact pressure and oil protection in the field of large current use. The representative composition of Ag Cu alloy is 95% silver copper, 92.5% silver copper, 90% silver copper, 60% silver copper and 5% silver copper alloy.