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annealing for 1 hr after different degrees
of cold working
Fig. 2.108:
Softening of Ag/SnO<sub>2</sub> 88/12 WPX after
annealing for 1 hr after different degrees
of cold working
Fig. 2.107:
Strain hardening of
Ag/SnO<sub>2</sub> 88/12 WPX
by cold working
Fig. 2.109: Micro structure of Ag/SnO<sub>2</sub> 92/8 PE: a) perpendicular to extrusion direction
b) parallel to extrusion direction
Fig. 2.110: Micro structure of Ag/SnO<sub>2</sub> 88/12 PE: a) perpendicular to extrusion direction
b) parallel to extrusion direction
Fig. 2.111: Micro structure of Ag/SnO<sub>2</sub> 88/12 PW: a) perpendicular to extrusion direction
b) parallel to extrusion direction
Fig. 2.112: Micro structure of Ag/SnO<sub>2</sub> 98/2 PX: a) perpendicular to extrusion direction
b) parallel to extrusion direction
Fig. 2.113: Micro structure of Ag/SnO<sub>2</sub> 92/8 PX: a) perpendicular to extrusion direction
b) parallel to extrusion direction
Fig. 2.114: Micro structure of Ag/SnO<sub>2</sub> 88/12 TOS F: a) perpendicular to extrusion direction
b) parallel to extrusion direction
Fig. 2.115: Micro structure of Ag/SnO<sub>2</sub> 86/14 WPC: a) perpendicular to extrusion direction
b) parallel to extrusion direction, 1) AgSnO<sub>2</sub> contact layer, 2) Ag backing layer
Fig. 2.116: Micro structure of Ag/SnO<sub>2</sub> 92/8 WTOS F: a) perpendicular to extrusion direction
b) parallel to extrusion direction,1) AgSnO<sub>2</sub> contact layer, 2) Ag backing layer
Fig. 2.117: Micro structure of
Ag/SnO<sub>2</sub> 88/12 WPD: parallel to extrusion direction
1) AgSnO<sub>2</sub> contact layer, 2) Ag backing layer
Fig. 2.118: Micro structure of
Ag/SnO<sub>2</sub> 88/12 WPX:parallel to extrusion direction
1) AgSnO<sub>2</sub> contact layer, 2) Ag backing layer
Fig. 2.119: Micro structure of Ag/SnO<sub>2</sub> 86/14 WPX: a) perpendicular to extrusion direction
b) parallel to extrusion direction, 1) AgSnO<sub>2</sub> contact layer, 2) Ag backing layer
Table 2.27: Physical Properties of Powder Metallurgical Silver-Metal Oxide Materials
with Fine Silver Backing Produced by the Press-Sinter-Repress Process
*'''Silver–zinc oxide (DODURIT ZnO) materials'''
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 ''(Figs. 2.120 – 2.125)'' ''(Table 2.28)''. Adding Ag<sub>2</sub>WO<sub>4</sub> in the process b)
as described in the preceding chapter on Ag/SnO<sub>2</sub> 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 ''(Tables 2.30 and 2.31)''.
