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Silver and Silver Alloys Silver possesses the highest electrical and thermal conductivity, low contact resistance, very good deformability and is characterized by good brazability and weldability. Silver as contact material satisfies the requirements only in a narrow range of electrical applications. Alloying of silver with palladium improves the resistance against both the electric wear and corrosion. Alloying of silver with copper and nickel in low concentrations increases the mechanical hardness and the resistance against electrical wear, but without reducing the electrical conductiviy and increasing contact resistance essentially. Finally, silver with alloying additives like manganese and nickel are the basis for dispersion hardened alloys. - Ag
- AgPd30...50
- AgCu3...10
- ARGODUR® SPECIAL: AgNi 0,15
- ARGODUR® 27: Ag (Cu+Ni) 2
- ARGODUR® 32: Ag (Mg+Ni) 0,3...0,5
• Produced by a melting process, extruded, rolled resp. drawn.
• Processing in the shape of rods, wires, strips, profiles, tips and rivets.
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Silver/Nickel SINIDUR® Powder metallurgically produced silver/nickel contact materials are more resistant against electric wear and contact welding than silver alloys. They possess good arc mobility and arc extinguishing properties as well as high electrical and thermal conductivity. Contact resistance increases with the amount of nickel. SINIDUR® contact materials can be deformed without problems and they are brazable and weldable. - SINIDUR®
Ag/Ni 10...40
• Produced powder metallurgically, sintered, rolled resp. drawn.
• Processing in the shape of rods, wires, strips, profiles, tips and rivets.
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Silver/Tin Oxide SISTADOX® SISTADOX® contact materials are characterized by the following properties: long life time of the contact pieces, low contact resistance, high security against contact welding, good arc mobility and arc extinguishing properties, ecological. SISTADOX® contact materials are optimized for different applications and utility categories by adding small amounts of additional metal oxides and applying different production technologies. - SISTADOX® P and WP
Ag/SnO2 8...12 P and Ag/SnO2 8...12 WP
• Produced powder metallurgically, sintered, extruded, rolled resp. drawn.
• Without additional metal oxides.
SISTADOX®8...12 P:
• Processing in the shape of rods, wires (wire riveting) and rivets.
SISTADOX®8...12 WP:
• An additional Ag layer on the underside (10-20% of the total thickness)
makes the material brazable and weldable.
• The Ag underside can be provided with a layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips. - SISTADOX® PW
Ag/SnO28...12 PW
• Produced powder metallurgically, sintered, extruded, rolled resp. drawn.
• With low concentrations of WO3 additives.
• Processing in the shape of rods, wires (wire riveting) and rivets. - SISTADOX® PE
Ag/SnO28...12 PE
• Produced powder metallurgically, sintered, extruded, rolled resp. drawn.
• With Bi2O3 - and CuO additives
• Processing in the shape of rods, wires (wire riveting) and rivets. - SISTADOX® PX and WPX
Ag/SnO2 2...8 PX and Ag/SnO2 6...14 WPX
• Produced powder metallurgically, based on the reaction spray process,
sintered, extruded, rolled resp. drawn.
• With Bi2O3 - and CuO additives.
SISTADOX® PX:
• Ag/SnO2 2 PX wire sections can be welded on directly to the carrier material.
• Processing in the shape of rods, wires (wire riveting) and rivets.
SISTADOX® WPX:
• An additional Ag layer on the underside (10-20% of the total thickness)
makes the material brazable and weldable.
• The underside can be provided with a layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips. - SISTADOX® PC and WPC
Ag/SnO2 2...8 PC and Ag/SnO2 6...14 WPC
• Produced powder metallurgically, based on the reaction spray process,
sintered, extruded, rolled resp. drawn.
• Comparing to SISTADOX®PX and WPX with a higher concentration
of Bi2O3 - and CuO additives.
SISTADOX® PC:
• Ag/SnO2 2 PC wire sections can be welded on directly to the carrier material.
• Processing in the shape of rods, wires (wire riveting) and rivets.
SISTADOX® WPC:
• An additional Ag layer on the underside (10-20% of the total thickness)
makes the material brazable and weldable.
• The underside can be provided with a layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips. - SISTADOX® WPD
Ag/SnO2 6...14 WPD
• Produced powder metallurgically, sintered, extruded, rolled resp. drawn.
• With Ag2MoO4 additives.
• An additional Ag layer on the underside (10-20% of the total thickness)
makes the material brazable and weldable.
• The underside can be provided with a layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips.
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Silver/Zinc Oxide DODURIT® DODURIT® contact materials consists of silver/zinc oxide or silver/cadmium oxide. The ecological DODURIT®ZNO contact materials, and particularly with specific metal oxide additives, are characterized by a high switching life time in AC relay applications. - DODURIT® ZNO P
AgZnO 8 P
• Produced powder metallurgically, sintered, extruded, rolled resp. drawn.
• Without additional metal oxides.
• Processing in the shape of rods, wires (wire riveting) and rivets. - DODURIT® ZNO WP
AgZnO 8 WP
• Produced powder metallurgically, sintered, extruded, rolled resp. drawn.
• Without additional metal oxides.
• An additional Ag layer on the underside (10-20% of the total thickness)
makes the material brazable and weldable.
• The underside can be provided with a layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips.
- DODURIT® ZNO PW100
AgZnO 8 PW100
• Produced powder metallurgically with manufacturing procedure "coating",
sintered,
extruded, rolled resp. drawn.
• With slightly more AgWO4 additives, when compared to DODURIT® ZNO PW25
• Processing in the shape of rods, wires (wire riveting) and rivets.
- DODURIT® ZNO PW25
AgZnO 6...10 PW25
• Produced powder metallurgically with manufacturing procedure "coating",
sintered,
extruded, rolled resp. drawn.
• With Ag2WO4 additives.
• Processing in the shape of rods, wires (wire riveting) and rivets.
- DODURIT® ZNO WPW25
Ag/ZnO 6...10 WPW25
• Produced powder metallurgically with manufacturing procedure "coating",
sintered,
extruded,
rolled resp. drawn.
• With Ag2WO4 additives.
• An additional Ag layer on the underside (10-20% of the total thickness)
makes the material brazable and weldable.
• The underside can be provided with a layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips.
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Silver/Cadmium Oxide DODURIT®
DODURIT®contact materials consists of silver/cadmium oxide or silver/zinc oxide. Cd containing materials are increasingly substitited by ecological SISTADOX® or by DODURIT® ZnO - contact materials.DODURIT®CDO is apllied in switchgears when a long life time of the contact pieces, resistance against welding and low contact resistance is demand.
- DODURIT® CDO
AgCdO 10...15
• AgCd alloy, casted, extruded, rolled resp. drawn, internal oxidized, drawn.
• Processing in the shape of rods, wires (wire riveting) and rivets. - DODURIT® CDO ZH
AgCdO 10...15 ZH
• AgCd alloy, casted, rolled, internal oxidized, rolled resp. drawn.
• The AgCd 10...15 layer on the underside (10-30% of the total thickness)
makes the material brazable and weldable.
• The AgCd 10...15 underlayer can be additionally provided with a layer of\
a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips. - DODURIT® CDO ZH AG
AgCdO 10...15 ZH AG
• AgCd alloy, casted, rolled, internal oxidized, rolled resp. drawn.
• An additional Ag layer on the underside (10-20% of the total thickness)
makes the material brazable and weldable.
• The Ag underlayer can be additionally provided with a layer of a brazing alloy
(e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips. - DODURIT® CDO P
AgCdO 10...15 P
• Produced powder metallurgically, sintered, extruded, rolled resp. drawn.
• Processing in the shape of rods, wires (wire riveting) and rivets. - DODURIT® CDO WP
AgCdO 10...15 WP
• Produced powder metallurgically, sintered, extruded, rolled resp. drawn.
• An additional Ag layer on the underside (10-20% of the total thickness)
makes the material brazable and weldable.
• The underside can be provided with a layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips, profiles and tips.
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Silver/Graphite GRAPHOR® GRAPHOR® contact materials possesses very high resistance against welding at closing and when contacts are closed in case of short circuits. The welding resistance increases with the concentration of graphite but also the amount of electric wear. GRAPHOR® contact materials with graphite fibres embedded into the Ag matrix are improved both regarding to the overtemperature properties and to the switching life time, comparing to conventional silver/graphite materials. - GRAPHOR®
Ag/C 2...5
• Produced powder metallurgically, sintered and extruded.
• The graphite particles are aligned vertically to the switching surface.
• Tips on one side or on all sides with a thin Ag layer.
• Welding side is planed or shaped and should the occasion arise, provided
with an additional layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of tips. - GRAPHOR® D
Ag/C 3D...4D
• Produced powder metallurgically, sintered, extruded and rolled.
• The graphite particles are aligned parallel to the switching surface.
• Welding side with a thin Ag layer, shaped, and should the occasion arise,
provided with an additional layer or a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips and tips. - GRAPHOR® DF
Ag/C DF
• Produced powder metallurgically, sintered, extruded and rolled.
• The graphite is embedded into the Ag matrix as powder (approx. 1,5 wt.%)
and in the shape of fibres (approx. 2,3 wt.%).
• Welding side with a thin Ag or AgNi10 layer, shaped, and should the
occasion arise, provided with an additional layer or a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of strips and tips.
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Silver/Tungsten, Silver/Tungsten Carbide SIWODUR® These contact materials possess a very high resistance against electric wear and contact welding. Due to the formation of tungsten oxides and tungstates on the surface of silver/tungsten contact materials, contact resistance will increase during the switching life time. Silver/Tungsten Carbide is more favourable in this respect. With a small amount of graphite overtemperature behaviour can be additionally improved. - SIWODUR®
Ag/W 50...80 - SIWODUR® C
Ag/WC 38...65 • Produced powder metallurgically in single pressed technics, subsequently
infiltrated with Ag in liquid phase.
• The lower side of the contact tips is shaped and infiltrated with a certain excess of Ag.
• The lower side can be additionally provided with a layer of a brazing alloy
(e.g. L-Ag15P).
• Processing in the shape of tips. - SIWODUR® C PLUS
Ag/WC/C 82/16/2...70/27/3
• Produced powder metallurgically in single pressed technics, and subsequently
sintered.
• Lower side of the contact tips is shaped and additionally provided with
a layer of a brazing alloy (e.g. L-Ag15P).
• Processing in the shape of tips.
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Silver/Molybdenum SILMODUR® Silver/molybdenum has a slightly lower electric wear resistance than silver/tungsten. Since molybdenum oxides are less stable than tungsten oxides, the surface of SILMODUR® contact pieces can be more easily cleaned by the electric arc and for that reason contact resistance is lower. - SILMODUR®
Ag/Mo 50...70
• Produced powder metallurgically in single pressed technics, subsequently
infiltrated with Ag in liquid phase.
• Lower side of the contact tips is shaped and infiltrated with a certain excess of Ag.
• The lower side can be additionally provided with a layer of a brazing alloy
(e.g. L-Ag15P).
• Processing in the shape of tips.
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Copper/Chromium, Copper/Tungsten, Silver/Tungsten Carbide VACURIT® VACURIT® contact materials, based on copper/chromium, copper/tungsten, copper/tungsten/antimony and silver/tungsten carbide, are optimized for vacuum switches. They have a sufficiently low gas content or only a slight tendency to release gases. The electric wear of VACURIT® contact materials during life time is generally flat and uniform. The materials are largely resistant to welding. This applies both to closing and to the conduction of high currents. Both, contact resistance and copping current, of VACURIT® contact materials remain largely unchanged throughout the service life of the switching device. - VACURIT®
Cu/Cr 25...50 - VACURIT®
W/Cu 20, W/Cu30/Sb1 - VACURIT®
WC/Ag 40• Produced powder metallurgically in single pressed technics,
sintered and if necessary additionally pressed.
• WC/Ag is infiltrated by Ag in liquid phase, after pressing the powder and sintering.
• Processing iin the shape of discs, rings, mouldings spirally and radially slitted.
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Copper/Tungsten CUWODUR® CUWODUR® contact materials consist of copper/tungsten and copper/tungsten carbide. This group of materials is especially arc and electric wear resistant and is used in high and medium voltage switchgears. In these applications CUWODUR® shows its high resistance to thermal and mechanical shocks. An additional field of application of CUWODUR® materials are electrodes for lighting protection devices. - CUWODUR®
Cu/W 50...80 - CUWODUR® H
Cu/W 75H...80H - CUWODUR® C
Cu/WC 50• Produced powder metallurgically in single pressed technics,
sintered and infiltrated with Cu in liquid phase.
• Joining of CUWODUR® materials with electrically and thermally high conductive
carrier materials by electron beam welding, percussion welding and brazing.
• Processing in the shape of tips, formed parts, tuplis, spring hard tulips, tubes and rods.
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