Silver Tungsten Contacts

1. Overview
Silver tungsten contacts are composite electrical materials made by combining silver's excellent conductivity with tungsten's high hardness and arc resistance. These materials are widely used in medium- and high-voltage electrical equipment such as circuit breakers, contactors, relays, and switching devices.

2. Key Features
Excellent electrical conductivity
Superior resistance to arc erosion
High mechanical strength and wear resistance
Low welding and sticking tendency
High thermal stability for demanding environments

3. Typical Applications
Medium- and high-voltage AC/DC contactors
High-voltage circuit breakers
Vacuum switches and load break switches
Power system relays
Rail transit and industrial automation control systems

4. Manufacturing Process
Silver tungsten contacts are produced using a powder metallurgy and vacuum infiltration process. The general steps are:
Powder Compaction: High-purity tungsten powder is compacted into a green body.
High-Temperature Sintering: The compacted part is sintered in a controlled atmosphere to form a porous tungsten skeleton.
Vacuum Infiltration: Molten silver is infiltrated into the tungsten skeleton under vacuum, resulting in a dense, bonded composite material.

This process ensures tight integration between silver and tungsten, providing optimal electrical and mechanical performance.