Tungsten-silver alloys are pseudo-alloys composed of silver and tungsten, a binary alloy of silver and tungsten. Because tungsten has an extremely high melting point and is immiscible with silver, traditional methods are not feasible; powder metallurgy is the only viable method.
Silver and tungsten are immiscible in both liquid and solid states. Tungsten-silver alloys can only be prepared using powder metallurgy to create sintered materials, although extrusion methods are also possible. Materials closely related to tungsten and silver are characterized by high hardness, strong resistance to arc erosion, adhesion, and welding. Alloys with more than 60% tungsten are often produced using the infiltration method. Tungsten-silver alloys are commonly used as pre-contacts in low-voltage power switches, crane switches, locomotive switches, high-current switches, and heavy-duty relays and air circuit breakers. Adding cobalt improves the wettability of silver to tungsten and reduces contact resistance.
The preparation process of silver-tungsten alloy mainly includes the following key steps:
**Balance Mixing:** Silver powder and tungsten powder are mixed in a specific ratio to ensure uniform mixing. This step is fundamental to the preparation process and directly affects the effectiveness of subsequent steps and the performance of the final product.
**Pressure Molding:** The mixed powder is placed in a mold and pressed to create a blank of the desired shape. This step requires careful control of pressure and time to ensure the shape and dimensions of the blank meet requirements.
**Sintering and Melting:** The pressed blank is sintered and melted under specific temperature and conditions. This step helps to bond the silver and tungsten powder particles more tightly, improving the alloy’s density and properties.
**Cold Working:** The sintered and melted alloy undergoes cold working processes, such as cutting and grinding, to obtain the final silver-tungsten alloy product.
Furthermore, it is important to note that because tungsten and silver have vastly different melting points, they are immiscible in both liquid and solid states. Therefore, traditional methods cannot be used in the preparation of silver-tungsten alloys; instead, specialized techniques, such as powder metallurgy, are required to produce high-quality silver-tungsten alloys.
Tungsten-silver alloys are widely used in high-temperature materials, electrical alloys for high-voltage switches, EDM electrodes, and microelectronic materials. They are also widely used as components and parts in aerospace, aviation, electronics, power, metallurgy, machinery, and sporting goods industries.
Tungsten-silver grades: AgW30, AgW40, AgW50, AgW55, AgW60, AgW65, AgW70, AgW75, AgW80, AgW85
Technical parameters:
Post time: Dec-30-2025