Overview
Tungsten copper (WCu) electrode plates and rods are composite materials combining tungsten's high melting point (3422°C) with copper's superior conductivity. Typically containing 30-50% copper by weight, they are manufactured through powder metallurgy processes like infiltration or hot pressing. These materials are indispensable in industries requiring components that withstand extreme thermal and electrical stresses. Their unique properties stem from the pseudo-alloy structure where tungsten particles are embedded in a copper matrix, offering a balance rarely achieved by pure metals.
Physical and Chemical Properties
The physical properties vary significantly with composition. A W70Cu30 alloy typically shows thermal conductivity of 180-200 W/m·K and electrical conductivity of 42-45% IACS (International Annealed Copper Standard). Hardness ranges between 220-260 HB. Chemically, the material is stable under normal conditions but oxidizes at temperatures above 500°C. The copper component makes it susceptible to ammonia and sulfide corrosion. Thermal expansion is exceptionally low (6.5-8.5 ×10⁻⁶/K), matching ceramics and silicon wafers in critical applications.
Main Applications
In EDM (Electrical Discharge Machining), WCu electrodes provide excellent wear resistance when machining hardened steels and carbides. The automotive industry uses them for resistance welding tips due to their non-sticking properties with aluminum and galvanized steel. High-voltage applications include vacuum interrupters and circuit breaker contacts where the material's arc-quenching properties prevent welding during fault currents. Aerospace applications leverage their thermal management capabilities in rocket nozzles and guidance system components.
Safety and Storage
Primary hazards occur during machining, where tungsten-copper dust requires proper ventilation and respiratory protection. Finished products pose minimal risk but should be handled with gloves to prevent copper contamination in sensitive environments. Storage should be in sealed containers with desiccants to prevent oxidation. Avoid contact with acids or ammonia compounds. For long-term storage, applying anti-tarnish coatings is recommended, especially for high-copper-content alloys.
B2B Procurement Guide
Key specifications to confirm include: tungsten content (usually 50-90%), density (aim for >95% theoretical density), and impurity levels (oxygen content <0.1% for high-performance applications). For EDM electrodes, surface roughness (Ra <0.8μm) and dimensional tolerances (±0.01mm for precision applications) are critical. Bulk purchases (100kg+) typically secure 15-20% discounts. Verify suppliers provide material certification (e.g., RoHS compliance, ASTM B702 standard).
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