2,315
edits
Changes
→Silver-Metal Oxide Materials Ag/CdO, Ag/SnO2, Ag/ZnO
''Powder metallurgy'' plays a significant role in the manufacturing of Ag/SnO<sub>2</sub> contact materials. Besides SnO<sub>2</sub> a smaller amount (<1 wt%) of one or more other metal oxides such as WO<sub>3</sub>, MoO<sub>3</sub>, CuO and/or Bi<sub>2</sub>O<sub>3</sub> are added. These
additives improve the wettability of the oxide particles and increase the viscosity of the Ag melt. They also provide additional benefits to the mechanical and arcing contact properties of materials in this group.
<figtable id="tab:tab2.26">
<caption>'''<!--Table 2.26:--> Physical and Mechanical Properties as well as Manufacturing Processes and Forms of Supply of Extruded Silver-Tin Oxide Contact Materials'''</caption>
{| class="twocolortable" style="text-align: left; font-size: 12px"
|-
!Material
!Silver Content<br />[wt%]
!Additives
!Density<br />[g/cm<sup>3</sup>]
!Electrical<br />Resistivity<br />[μΩ·cm]
!colspan="2" style="text-align:center"|Electrical<br />Conductivity<br />[% IACS] [MS/m]
!Vickers<br />Hardness<br />Hv1
!Tensile<br />Strength<br />[MPa]
!Elongation<br />(soft annealed)<br />A[%]min.
!Manufacturing<br />Process
!Form of<br />Supply
|-
|Ag/SnO<sub>2</sub> 92/8PW10<br />
|91 - 93
|WO<sub>3</sub>
|9.9
|2
|86
|50
|50 - 95
|200 - 320
|30
|Powder Metallurgy<br />
|1
|-
|Ag/SnO<sub>2</sub> 90/10PW10<br />
|89 - 91
|WO<sub>3</sub>
|9.8
|2.08
|83
|48
|55 - 100
|220 - 330
|28
|Powder Metallurgy
|1
|-
|Ag/SnO<sub>2</sub> 88/12PW10<br />
|87 - 89
|WO<sub>3</sub>
|9.7
|2.17
|79
|46
|60 - 106
|230 - 330
|25
|Powder Metallurgy
|1
|-
|Ag/SnO<sub>2</sub> 90/10PE<br />
|89 - 91
|Bi<sub>2</sub>O<sub>3</sub> and CuO
|9.8
|2.04
|84
|49
|55 - 100
|230 - 330
|28
|Powder Metallurgy
|1
|-
|Ag/SnO<sub>2</sub> 88/12PE<br />
|87 - 89
|Bi<sub>2</sub>O<sub>3</sub> and CuO
|9.7
|2.17
|79
|46
|60 - 106
|235 - 330
|25
|Powder Metallurgy
|1
|-
|Ag/SnO<sub>2</sub> 88/12 TOS F<br />
|87 - 89
|In<sub>2</sub>O<sub>3</sub>
|9.8
|2.22
|78
|45
|100 - 120
|330 -430
|25
|Inernal Oxidation
|1,2
|-
|Ag/SnO<sub>2</sub> 90/10WPD<br />
|89 - 91
|Ag<sub>2</sub>MoO<sub>4</sub>
|9.9
|2.13
|81
|47
|70 - 120
|
|
|Powder Metallurgy
|2
|-
|Ag/SnO<sub>2</sub> 88/12WPD<br />
|87 - 89
|Ag<sub>2</sub>MoO<sub>4</sub>
|9.8
|2.27
|76
|44
|75 - 120
|
|
|Powder Metallurgy
|2
|}
</figtable>
1 = Wires, Rods, Contact rivets, 2 = Strips, Profiles, Contact tips
