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:'''e) Powder blending based on chemically precipitated compound powders''' <br> A silver salt solution is added to a suspension of for example SnO2 together with a precipitation agent. In a chemical reaction silver and silver oxide respectively are precipitated around the additive metal oxide particles who act as crystallization sites. Further chemical treatment then reduces the silver oxide with the resulting precipitated powder being a mix of Ag and SnO2.
Further processing of these differently produced powders follows the
conventional processes of pressing, sintering and hot extrusion to wires and
strips. From these contact parts such as contact rivets and tips are
manufactured. To obtain a brazable backing the same processes as used for
Ag/CdO are applied. As for Ag/CdO, larger contact tips can also be
manufactured more economically using the press-sinter-repress (PSR) process
''(Table 2.27).''
Fig. 2.87:
Strain hardening of
Ag/SnO 92/8 PE by cold working
Fig. 2.88:
Softening of
Ag/SnO 92/8 PE after annealing
for 1 hr after 40% cold working
Table 2.26: Physical and Mechanical Properties as well as Manufacturing Processes and
Forms of Supply of Extruded Silver-Tin Oxide (SISTADOX) Contact Materials
Fig. 2.89:
Strain hardening of
Ag/SnO 88/12 PE by cold working
Fig. 2.90:
Softening of Ag/SnO 88/12 PE
after annealing for
1 hr after 40% cold working
Fig. 2.91:
Strain hardening of oxidized
Ag/SnO 88/12 PW4 by cold working
Fig. 2.92:
Softening of Ag/SnO 88/12 PW4 after
annealing for 1 hr
after 30% cold working
Fig. 2.93:
Strain hardening of
Ag/SnO 98/2 PX
by cold working
Fig. 2.94:
Softening of
Ag/SnO 98/2 PX
after annealing
for 1 hr after 80%
cold working
Fig 2.95:
Strain hardening
of Ag/SnO 92/8 PX
by cold working
Fig. 2.96:
Softening of
Ag/SnO 92/8 PX
after annealing for 1 hr
after 40% cold working
Fig. 2.97:
Strain hardening of internally
oxidized
Ag/SnO 88/12 TOS F
by cold working
Fig. 2.98:
Softening of
Ag/SnO 88/12 TOS F after
annealing for 1 hr after 30%
cold working
Fig. 2.99:
Strain hardening of
internally oxidized
Ag/SnO 88/12P
by cold working
Fig. 2.100:
Softening of
Ag/SnO 88/12P
after annealing for 1 hr after
40% cold working
Fig. 2.101:
Strain hardening of
Ag/SnO 88/12 WPC
by cold working
Fig. 2.102:
Softening of Ag/SnO 88/12 WPC after annealing
for 1 hr after different degrees of cold working
Fig. 2.103:
Strain hardening of
Ag/SnO 86/14 WPC
by cold working
Fig. 2.104:
Softening of Ag/SnO 86/14 WPC after annealing
for 1 hr after different degrees of cold working
Fig. 2.105:
Strain hardening of
Ag/SnO 88/12 WPD
by cold working
Fig. 2.106:
Softening of Ag/SnO 88/12 WPD after
annealing for 1 hr after different degrees
of cold working
