Bimetal Contact consist of soft, high-conductivity, oxidation-resistant materials used as the makeup of electrical components. They are the materials in a system through which an electrical current flows; such as:
- Circuit breakers
- Relays,
- Switches,
- EDM applications
- earth leakage breakers
Bimetal contact rivets comes in a variety of sizes. You can find options both small to extremely large, depending on your voltage requirements and usage.
Bimetal contact are typically made from any metal with high electrical conductivity. However, in applications such as high-power equipment where mechanical wear is expected, a conductive metal may be used. Common electrical contact materials include:
- Silver
- Copper
- Gold
- Platinum
- Palladium
- Brass
Bimetal Contact Material Properties
When choosing the best Bimetal contact for your application, it is important to keep in mind the six most important properties:
- Conductivity
- Corrosion Resistance
- Hardness
- Current Load
- Cycle Life
- Size
Bimetal Contact Conductivity
Conductivity refers to the measure of a materials ability to conduct or carry an electric current. You will see this as a percent of a copper standard (ex: 100% International Annealed Copper Standard or IACS) Silver, which has the highest conductivity, has an IACS of 105.
Corrosion Resistance
Corrosion resistance of electrical contacts refers to a material’s ability to resist chemical decay. Any material with little corrosion resistance will decay faster than ones with high resistance. Hardness
This measures how resistant materials are to various kinds of permanent deformations from an applied force. It is dependant on five factors:
- Ductility
- Elasticity
- Plasticity
- Tensile Strength
- Toughness
Alloys composition
- Silver Cadmium Oxide
- Silver Graphite
- Silver Tin Oxide
- Silver Nickel
Scope
This information refers to silver cadmium oxide wires, profiles and contact tips manufactured by blending of silver and cadmium oxide powder,cornpacting, sintering, extruding and then drawing or rolling to final dimension. Profiles and tips are available with a brazeable silver backing layer.
DESIGNATION OF STANDARD COMPOSITIONS
The silver content is designated by the first number: e.gAg/CdO 88/12 with 88 wt.-% silver, balance CdO. The standard oxide contents are 10,12 and 15.
Applications
- switches for domestic applications, main switches
- earth leakage breakers, miniature circuit breakers
- contactors
- circuit breakers up to a switching current of 3000 A
- power Line relays
CHARACTERISTICS
- excellent anti-welding properties on make, higher CdO content is improving anti-welding properties
- low contact resistance compared to other metal oxides
- contact resistance stable throughout the time life
- low arc erosion,excellent arc extinguishing properties
- tendency for material transfer in DC applications
MICROSTRUCTURE
The nature of our Production process leads to a certain orientation of the CdO particles along the direction of extrusion.
Longitudinal Sectional
Ag/CdO 90/ 10 SP
Cross Section
Ag/CdO 90/ 10 SP
Longitudinal Sectional
Ag/CdO 85/ 15 SP
Physical Properties
| Material | Ag/CdO 90/ 10 SP | Ag/CdO 90/ 10 SP | Ag/CdO 85/ 15 SP |
| Density [g/cm3] | 10.2 | 10.1 | 10.0 |
| Electrical Conductivity [m/(Ω.mm2)] | 48 | 47 | 45 |
| Hardness Soft [Mpa] | 50 | 60 | 65 |
| Tensile Strenght Soft[Mpa] | 240 | 250 | 260 |
| Elongation [%] | 30 | 29 | 25 |
Scope
This information refers to silver graphite profiles and contact tips manufactured by blending of silver and graphite powder, compacting, sintering, extruding and rolling. The deformation results in the alignment of graphite particles along the direction of the extrusion and rolling. A brazeable silver side is produced by decarburization. Profiles clad with a brazing alloy and presoldered contact tips are available.
DESIGNATION OF STANDARD COMPOSITIONS
Profiles show a parallel orientation of the graphite to the contact surface and can be produced with 2 and 3 weight percent graphite. contact tips with 2,3,4 and 5% are available either with the parallel orientation (AgC II) or with a perpendicular orientation of the graphite to the contact surface (AgC!)
Applications
- circuit breakers
- earth leakage breakers
- miniature circuit breakers
CHARACTERISTICS
- best anti-welding properties of all contact materials on make with C-contents of 3% and higher (better with graphite particle alignment parallel to contact side)
- best protection against contact welding of closed contacts under short ciruit currents
- low erosion on make
- low contact resistance
- reduced erosion on break with perpendicular graphite particle alignment to contact surface
- inferior are migration properties; compensated by asymmetrical material combinations:
- Cu counter-contact with low currents
- AgNi counter-contact with high currents
MICROSTRUCTURE
The directional deformation of the material during the manufacturing process causes a strong displacement of the graphite particles into graphite layers.
Longitudinal Sectional
(parallel to the diretion of extrusion)
AgC
3 Cross Section
AgC
5 Cross Section
Physical Properties
| Material | AgC2 | AgC3 | AgC4 | AgC5 |
| Density [g/cm3] | 9.4 | 9.1 | 8.8 | 8.6 |
| Electrical Conductivity [m/(Ω.mm2)] | 47 | 47 | 44 | 43.5 |
| Hardness Soft [HV1] | 35 | 35 | 35 | 35 |
Scope
This information refers to silver tin oxide wires, profiles and contact tips manufactured by blending of silver and metal oxide powder (SP) or with additives (SPW), compacting, sintering, extruding and drawing or rolling to final dimensionaProfiles and tips are available with a backing layer of silver and optionalLy with an additional layer of a brazing ahoy.
DESIGNATION OF STANDARD COMPOSITIONS
The silver content is designated by the first number e.g. Ag/Sn02 88/12 with 88 wt.-% silver, balance metal oxides. The typical graduation of the latter are 8, 10 and 12. Additives improve the switching behaviour of the different materials.
Applications
- contactors
- automotive relays
- powerline relays
- miniature circuit breakers
- switches for domestic applications
CHARACTERISTICS
- best anti-welding properties on make of all silver metal oxide variants up to currents of 5000A ( increasing with higher oxide content)
- lowest erosion rate of all silver metal oxide materials of currents exceeding 100 A
- significantly less material migration compared to Ag/CdO and Ag/ZnO
- low contact resistance comparable to other silver-metal oxides
- special additives keep the contact resistance stable throughout the service life
- excellent arc extinguising properties, better than Ag/CdO for currents upto 70 A
- free of toxic and carcinogenic components
MICROSTRUCTURE
The micron sized Sn0
2 particles are oriented slightly along the direction of extrusion direction of extrusion.
Longitudinal Sectional
Ag/SnO
2 92/8 SPW
Longitudinal Section
Ag/SnO
2 88/12 SPW
Cross Sectional
Ag/SnO
2 88/12 SPW
Physical Properties
| Material | Ag/SnO2 92/8 SPW | Ag/SnO2 90/10 SPW | Ag/SnO2 88/8 SPW |
| Density [g/cm3] | 10.1 | 10.0 | 9.9 |
| Electrical Conductivity [m/(Ω.mm2)] | 48 | 47 | 45 |
| Hardness Soft [HV1] | 57 | 62 | 67 |
| Tensile Strenght Soft[Mpa] | 225 | 230 | 235 |
| Elongation [%] | 32 | 30 | 28 |
Scope
This information refers to silver nickel wires, profiles and contact tips manufactured by blending of silver and nickel powder, compacting,sintering, extruding and drawing or rolling to final dimension.
DESIGNATION OF STANDARD COMPOSITIONS
the Ni content of the material is designated in weight percentage.
Standard gradations are 10, 15, 20%.
Applications
- switches for domestic applications, main switches
- switches for domestic application, auxiliary switches
- contactors of switching currents upto 100A
- miniature circuit breakers, circuit breakers (asymmetrical combination with AgC)
- power line relays, automotive relays
CHARACTERISTICS
- reliable anti-welding properties for switching currents upto 100A
- low contact resistance (nearly constant throughout the life time)
- low arc erosion for switching current upto 100A
- good arc migration and arc extinguishing properties
- good formability, can be welded directly
MICROSTRUCTURE
The Ni particles are deformed along the direction of extrusioii into fibres
AgNi10
Longitudinal Sectional (parallel to the diretion of extrusion)
AgNi10
Cross Section
AgNi20
Cross Section
Physical Properties
| Material | AgNi10 | AgNi15 | AgNi20 |
| Density [g/cm3] | 10.3 | 10.2 | 10.1 |
| Electrical Conductivity [m/(Ω.mm2)] | 54 | 48 | 46 |
| Hardness Soft [HV1] | 50 | 55 | 60 |
| Tensile Strenght Soft[Mpa] | 240 | 260 | 270 |
| Elongation [%] | 38 | 34 | 32 |
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