Overview
Tungsten alloy is a composite material comprising 85-98% tungsten with binders like nickel, iron, or copper. Developed in the mid-20th century, it combines tungsten’s density (19.25 g/cm³ pure) with improved machinability. The material is indispensable in applications requiring compact mass or radiation attenuation, outperforming lead in environmental safety. Common grades include W-Ni-Fe (90-95% W) for general engineering and W-Ni-Cu for non-magnetic applications. Its unique properties stem from liquid-phase sintering, creating a dense microstructure with tungsten particles embedded in a ductile matrix.
Physical and Chemical Properties
Tungsten alloy’s density ranges from 16.5 to 18.75 g/cm³—twice that of steel—enabling compact counterweights in aerospace and vibration damping. It maintains strength up to 1,200°C, with thermal conductivity (~70 W/m·K) surpassing stainless steel. Chemically, it resists corrosion from acids (except hydrofluoric/nitric mixtures) and oxidation below 400°C. The nickel/iron matrix enhances ductility (10-15% elongation) versus brittle pure tungsten. Electrical resistivity is low (~15 μΩ·cm), suitable for electrodes.
Main Applications
In aerospace, tungsten alloy balances helicopter rotors and aircraft control surfaces due to its space-efficient mass. Medical linear accelerators use it for collimators and shields, leveraging its superior radiation stopping power (60% better than lead at 100 keV). The military employs it in kinetic energy penetrators and fragmentation shells. Industrial uses include boring bars for deep-hole drilling and dies for extrusion. Emerging applications include isotope containers and gamma-ray therapy devices.
Safety and Storage
While solid alloy is stable, machining generates dust requiring NIOSH-approved respirators (P100 filters). Work areas need HEPA vacuum systems to prevent airborne tungsten particles (TLV 5 mg/m³). Store away from strong oxidizers (e.g., nitrates) to prevent exothermic reactions. Bulk material should be palletized with moisture barriers; small parts benefit from anti-tarnish paper. Spills require collection with non-sparking tools to avoid dust ignition.
B2B Procurement Guide
Specify density tolerance (±0.1 g/cm³ critical for balancing applications) and alloy type (e.g., AMS-T-21014 for aviation). Radiation shielding requires ASTM E521 compliance. For machining, request stress-relieved blanks to minimize distortion. Top suppliers include Plansee (Austria) and Mid-West Tungsten (USA). MOQs typically start at 50 kg for standard shapes. Lead times range from 4-8 weeks for custom sintered components. Certifications like ITAR or ISO 9001 are essential for defense contracts.
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