Electrical contact is one of the key parts of the electric apparatus, which function is making and breaking current. Ag-CdO contact materials have excellent resistance of electrical arc and welding and low electric contact resistance, which are widely used in many types of low-voltage apparatus from several to thousands of voltages and once considered as universal contacts. However, the steam of Cd metal is poisonous, which pollutes the environment and damages the human health. Consequently, many cou...