Three-layer Contact Rivet

Product Essence Deconstruction: The Functional Division Philosophy of a Sandwich Structure

Surface Silver (Ag): Typically 0.1–0.3 mm thick (dynamically adjusted according to current rating), it plays a dominant role in electrical contact. Silver's excellent conductivity ensures extremely low contact resistance, while its chemical inertness prevents the formation of a high-resistance oxide film at the contact interface in humid or slightly contaminated environments. Crucially, the silver layer undergoes plastic flow during riveting deformation, filling the microscopic unevenness of the mating surfaces and forming a "cold weld"-like physical interlock, which is the physical basis for low contact resistance.

Core Copper (Cu): As the structural skeleton, the copper layer occupies approximately 70–80% of the volume. Copper's high ductility (elongation ≥35%) gives the rivet sufficient deformation capacity during riveting, preventing brittle fracture. Meanwhile, copper has a thermal conductivity of approximately 400 W/(m·K), 1.05 times that of silver. This means that under current-carrying conditions, heat generated inside the contact can be rapidly conducted axially along the copper core, preventing softening failure caused by localised heat accumulation in the silver layer. The copper core also acts as an "elastic reservoir," absorbing energy through micro-elastic deformation under mechanical impact, protecting the brittle silver layer from excessive stretching.

The bottom layer of silver (Ag): symmetrically distributed with the surface layer, ensuring that the contact interface remains silver regardless of the riveting direction. This symmetrical design eliminates assembly directionality requirements, simplifying your production line operations while providing consistent electrical performance in double-ended contact scenarios (such as jumpers).

The ingenuity of this sandwich structure lies in its distinct functions and synergistic coupling. The silver layer focuses on electrical contact, while the copper core focuses on mechanical load-bearing and heat conduction. The two are integrated through a metallurgical interface, avoiding contact resistance drift caused by fretting wear in mechanically assembled OEM Tri-metal Contact Rivets.