Tungsten Copper Alloy Contact
1. What's Tungsten Copper Alloy Contact?
Tungsten copper alloy contact is a composite electrical contact made from tungsten and copper through powder metallurgy and copper infiltration. As a pseudo-alloy, it retains the distinct properties of both metals: tungsten provides high melting point, hardness, and resistance to arc erosion, while copper offers electrical conductivity and heat dissipation. This combination makes tungsten copper alloy contacts suitable for arcing and current-carrying components in switching equipment, where resistance to arc erosion and contact welding, along with stable electrical and thermal performance, is essential for reliable operation and extended service life.
2. Characteristics of CTIA's Tungsten Copper Alloy Contact
(1) Excellent Arc Erosion Resistance: Tungsten has high melting point and effectively withstands arc erosion, significantly reducing contact wear during repeated current interruption.
(2) Good Resistance to Contact Welding: The tungsten phase helps restrict the adhesion of molten metal, reducing the risk of contact welding under high-current and high-temperature conditions.
(3) Effective Sweating Cooling: At high temperatures, the copper phase melts and vaporizes, carrying away some heat and helping relieve overheating on the contact surface.
(4) Balanced Electrical and Thermal Conductivity: Copper conducts current and dissipates heat, reducing localized heat buildup, while different tungsten-to-copper ratios help balance electrical conductivity and arc erosion resistance.
(5) Stable Contact Resistance: The copper phase provides good conductive pathways, while appropriate material ratios and structural designs help maintain stable electrical contact performance.
(6) Good Wear Resistance: Tungsten increases hardness and wear resistance, allowing contacts to withstand mechanical stress during repeated switching operations; higher tungsten content generally improves arc erosion resistance but reduces electrical conductivity.
3. Applications of CTIA's Tungsten Copper Alloy Contact
(1) High-Voltage Circuit Breaker Arcing Contacts: Used as moving and fixed arcing contacts in high- and extra-high-voltage circuit breakers, offering strong arc erosion resistance to reduce material loss during current interruption.
(2) Vacuum Interrupter Contacts: Used as specialized contacts in vacuum circuit breakers and vacuum contactors, offering excellent resistance to contact welding and reliable current interruption.
(3) Gas-Insulated Switchgear Contacts: Used as arcing contacts in SF₆ circuit breakers and gas-insulated switchgear, withstanding intense arc impact under high-voltage conditions.
(4) On-Load Tap-Changer Contacts: Used as switching contacts in transformer On-Load Tap-Changers (OLTC), accommodating current switching and arcing effects during on-load voltage regulation.
4. Specifications of CTIA's Tungsten Copper Alloy Contact
(1) Common Materials: W70Cu30, W75Cu25, W80Cu20, W85Cu15, W90Cu10, etc.
(2) Product Shapes: Discs, rods, rings, and custom-shaped contacts.
(3) Product Structures: Integral contacts and insert-type contacts.
(4) Dimensions and Tolerances: Customizable.
With nearly 30 years of experience in tungsten copper alloy manufacturing, CTIA GROUP combines extensive powder metallurgy knowledge with precision machining expertise. CTIA provides customized contact solutions for different switching equipment, covering material selection, contact structure design, dimensional customization, and precision machining to meet specific electrical, thermal, and mechanical requirements.
For any inquiry, please contact tungsten copper manufacturer: CTIA GROUP
Email: sales@chinatungsten.com
Tel: 0086 592 5129696 / 0086 592 5129595
Website: tungsten-copper.com
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