Changes

Silver zinc oxide (DODURIT ZnO) contact materials with mostly 6 - 10 wt% oxide content including other small metal oxides are produced exclusively by powder metallurgy [[#figures1|(Figs. 2.120 76 – 7581)]], (Table 2.28). Adding Ag₂WO₄ in the process b) as described in the preceding chapter on Ag/SnO₂ has proven most effective for applications in AC relays, wiring devices, and appliance controls. Just like with the other Ag metal oxide materials, semi-finished materials in strip and wire form are used to manufacture contact tips and rivets. Because of their high resistance against welding and arc erosion Ag/ZnO materials present an economic alternative to Cd free Ag-tin oxide contact materials <xr id="tab:tab2.30"/> (Tab. 2.30) and <xr id="tab:tab2.31"/> (Tab. 2.31).