Triplex Contact Rivets

Triplex contact rivets are designed to reduce silver consumption while keeping the electrical contact surface in the required silver or silver alloy material. Instead of manufacturing the entire rivet from precious metal, a three-layer structure is used so that silver is concentrated in the functional contact areas and a lower-cost conductive metal is used in the intermediate section.

This structure is suitable for relays, switches, contactors and other electrical devices where contact performance and material cost both need to be controlled. Rivet dimensions, layer thickness and material combinations can be produced according to customer drawings.

A triplex rivet normally consists of three functional sections:

Silver or silver alloy contact layer

Conductive intermediate metal layer

Silver or silver alloy section at the required contact or mounting area

The exact structure depends on the customer's electrical design and riveting method.

Compared with a solid silver or solid silver-alloy rivet, the triplex structure reduces the amount of precious metal used in the part. For suitable designs, silver consumption can be reduced significantly while the required contact surface is maintained.

The actual saving depends on head diameter, contact layer thickness, rivet length and material combination.

The main technical challenge is not the shape of the rivet itself, but the bonding strength between the silver alloy layer and the base metal.

Traditional cold-welding methods rely on substantial plastic deformation to create a reliable solid-state bond between metals. In a conventional composite rivet, enough deformation can usually be generated during forming.

Triplex structures are more difficult because the geometry limits the amount of deformation available in some sections of the rivet. If the bonding interface is not properly controlled, insufficient bonding strength may lead to separation of the clad layer during forming or later assembly.

For this reason, material preparation, surface condition, forming ratio and subsequent bonding processes need to be controlled together rather than treating the part as an ordinary contact rivet.

For certain triplex contact structures, diffusion bonding can be used to improve the bonding reliability between different metal layers.

During this process, temperature, heating time and vacuum conditions need to be controlled carefully so that the materials bond without damaging the contact structure.

Uniform heating is particularly important because uneven temperature across the bonding area can result in inconsistent interface strength.

The exact process parameters depend on the silver alloy, base material, rivet size and required bonding strength.

Triplex contact rivets can be produced with different silver and silver-alloy contact materials according to the electrical load and application.

Typical options include:

• Fine silver
• AgNi silver nickel
• AgSnO2 silver tin oxide

Other silver alloy contact materials according to drawing requirements

The intermediate or supporting layer can use copper or another suitable conductive metal depending on the product design.

Triplex contact rivets are normally manufactured to customer drawing because the economic benefit of the structure depends heavily on the dimensions of each material layer.

Key parameters include:

For an existing solid-silver rivet, the original drawing can also be reviewed to determine whether a triplex structure is technically suitable.

The main purpose of a triplex design is to place silver only where it is needed.

In many conventional rivets, part of the silver alloy is located in areas that do not participate directly in electrical switching. Replacing these sections with copper or another conductive material can reduce precious-metal consumption.

However, the design should not be based on silver saving alone. Bonding strength, riveting performance, current-carrying path and mechanical reliability must also be considered.

A triplex structure is most effective when the material distribution is optimized together with the final electrical component design.

Triplex contact rivets can be used in:

• Relays
• Electrical switches
• Contactors
• Control devices
• Appliance switching components
• Other low-voltage electrical products

They are particularly suitable for applications with stable production volume where reducing silver consumption can produce a meaningful long-term cost benefit.

For a new triplex rivet project, please provide the existing contact drawing or sample together with the required material and annual quantity.

If the current part is a solid silver or conventional bimetal contact rivet, we can review the structure and discuss whether a three-layer design is practical.

For quotation and technical evaluation, please provide:

• Contact drawing
• Current material
• Required dimensions and tolerances
• Electrical application
• Estimated annual quantity
• Existing silver layer requirement, if available

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