Composite Contacts

Composite contacts are a type of electrical contact product manufactured using a composite process using two or more functional materials. They are designed to combine high conductivity, wear resistance, weld resistance, and long life. Compared to traditional single-material electrical contacts, Moving Silver Contacts achieve optimized performance by organically combining different materials, such as silver, copper, nickel, tungsten, and carbide. They play a core role in relays, contactors, circuit breakers, switchgear, and renewable energy power systems, and are critical components for the safe and stable operation of modern electrical systems.

Static Silver Contacts not only address the durability challenges of electrical equipment in high-current, high-frequency, and high-impact environments but also effectively reduce contact wear and maintenance costs, helping customers achieve higher economic benefits over the long term.

Traditional contacts often utilize single metal materials such as copper and silver alloys. While these materials offer basic conductivity, they are susceptible to increased wear and arc damage in scenarios involving high currents, high-frequency switching, and high-temperature corrosion due to material limitations (such as insufficient hardness and mismatched thermal expansion coefficients). Cold former Contacts innovatively utilize a three-dimensional composite structure of "substrate + functional layer + protective layer." By leveraging the complementary strengths of different materials, they break through the performance ceiling of single materials:

Substrate layer: Highly thermally conductive, easily formable copper alloys (such as beryllium copper and chromium copper) are selected to ensure stable current transmission and mechanical strength.

Functional layer: Nano-scale composite coatings (such as tungsten carbide-graphite and silver-graphene) are employed to achieve a balance of high hardness (reducing wear), low contact resistance (improving conductivity), and resistance to arc erosion.

Protective layer: A dense, anti-oxidation film (such as nickel-phosphorus alloy or diamond-like carbon) is formed on the surface through physical vapor deposition (PVD) or electroless plating processes to protect against corrosive media such as moisture and salt spray.

This synergistic design of "substrate load-bearing, functional layer damage resistance, and protective layer life extension" exponentially improves the core performance of Bimetal Silver Contacts in conductivity, wear resistance, and corrosion resistance, making them a truly durable hub in electrical connections.

Materials are the cornerstone of composite electrical contact performance. We adhere to the principle of "application-defined materials" and avoid blindly pursuing high-cost materials. Instead, we select the most suitable composite system through systematic evaluation.

Silver-based composite materials: Materials such as AgSnO₂, AgZnO, and AgWC combine high conductivity with excellent arc resistance, making them suitable for medium- to high-current switching applications. AgSnO₂ excels at interrupting inductive loads, with low arc energy and minimal Electrical Copper Rivets loss.

Copper-Based Reinforcement Structure: Serving as a supporting layer or conductive matrix, high-purity copper provides excellent thermal and electrical conductivity, effectively reducing temperature rise and preventing localized overheating.

Refractory Metal Incorporation: The incorporation of high-melting-point materials, such as tungsten and molybdenum, significantly improves the Silver Rivet Contact's resistance to welding, preventing "sticking" failures when high currents are closed.

Environmentally friendly material options: We offer cadmium- and lead-free green composite material solutions that comply with international environmental directives such as RoHS and REACH, meeting global market access requirements. All raw materials are sourced from long-term international suppliers with batch traceability, ensuring a stable supply chain and controlled quality.

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