AgSnO2 Based Contacts
Products Description
AgSnO2 Based Contacts are a class of electrical contact materials primarily composed of silver and tin oxide. They are predominantly utilized in switching equipment and control systems that require frequent current switching, the ability to withstand the impact of electric arcs, and a long electrical service life.
As a leading example of modern environmentally friendly electrical contact materials, they are widely employed in relays, contactors, circuit breakers, automotive electrical components, and industrial control equipment-particularly in applications where high demands are placed on contact reliability and resistance to contact welding.
Key Features
| Exceptional Resistance to Contact Welding | A specialized tin oxide dispersion structure of Silver Electric Contact Brazed effectively inhibits the flow of the molten metal pool, ensuring crisp and decisive switching operations. |
| Extremely Low and Stable Contact Resistance | Electricity Buttons through precision surface treatment, the contacts maintain a low and stable contact voltage drop, even after millions of switching cycles. |
| Superior Resistance to Arc Erosion | High-melting-point SnO2 particles act as a structural "skeleton" for the Welded Contacts, significantly reducing material burn-off rates. |
| Outstanding Resistance to Material Transfer | Under DC operating conditions, the material effectively suppresses unidirectional material migration between the anode and the cathode. |
Application Fields
AC Contactors
For the moving and stationary contacts of high-current contactors (50–100A), requirements include high resistance to contact welding and a long electrical service life. AgSnO2 materials with a SnO2 content of ≥12 wt% are the preferred choice for Silver Contact Welding.
Automotive Relays
For the switching contacts found in engine control systems, power windows, windshield wipers, and lighting relays, the Contact Tip Welding material must exhibit resistance to DC material transfer and withstand vibration. AgSnO2In2O3 (containing 3–5% In2O3) is the specialized grade designated for these applications.
General-Purpose and Latching Relays
For control relays used in smart meters and home appliances, key requirements include environmental friendliness, a long service life, and cost-effectiveness. Welded Contacts with a SnO2 content of 8–12 wt% offer an optimal balance between performance and economic efficiency.
Manufacturing Advantages
Controlled Internal Oxidation Process and Full-Process Atmosphere Protection
We employ advanced internal oxidation technology utilizing a precisely controlled atmosphere for Silver Contact Welding. Silver-tin alloy billets undergo prolonged treatment under specific oxygen partial pressures and temperatures, allowing oxygen to diffuse inward from the surface and selectively oxidize the tin component into SnO₂. By precisely regulating the oxygen pressure-temperature-time profile, we can control the propagation rate of the oxidation front as well as the nucleation and growth of oxide particles, thereby achieving the desired particle size and distribution depth.
Powder Metallurgy and Reactive Synthesis Technologies
For specific compositions and geometries, we utilize high-energy ball milling to prepare ultrafine silver-tin alloy powders. These powders are subsequently processed via powder metallurgy sintering-followed by internal oxidation-or directly through a reactive synthesis process. This approach yields a finer and more uniform distribution of oxide particles, making it particularly well-suited for the manufacture of high-performance Silver Contact Welding with complex or specialized shapes. We possess robust capabilities for the rigorous control of powder particle size and the precise management of sintering atmospheres.
contact us
For inquiries regarding product specifications, electrical contact application solutions, sample validation, or bulk quotations for AgSnO2 Based Contacts-or if you wish to discuss your relay and contactor designs-please feel free to contact our professional team. We will provide technical support and tailored solutions based on your specific application requirements.
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