Overview
Tungsten-Nickel-Iron (W-Ni-Fe) sheets are high-performance alloy materials engineered for applications requiring extreme density and durability. These sheets typically consist of 90-97% tungsten, balanced with nickel and iron for improved machinability and ductility. Originally developed for military and aerospace uses, they are now critical in medical radiation shielding and industrial tooling. The alloy's unique properties stem from tungsten's high atomic number, combined with nickel and iron's binding effects. This composition allows the sheets to outperform lead-based materials in terms of strength and environmental safety. Unlike pure tungsten, W-Ni-Fe sheets are easier to machine while retaining 95% of tungsten's density.
Physical and Chemical Properties
W-Ni-Fe sheets exhibit a density range of 16.5-18.5 g/cm³, making them among the densest commercially available alloys. Their thermal conductivity is relatively low (≈50 W/m·K), but they maintain structural integrity at temperatures up to 1,200°C. The alloy is paramagnetic due to nickel content, with a Vickers hardness of 280-350 HV. Chemically, these sheets resist corrosion from weak acids and alkalis but may oxidize in strong acidic environments. Their radiation attenuation capability is exceptional, absorbing 50% more gamma rays than lead at equivalent thickness. The typical tensile strength ranges from 700-1,000 MPa, with elongation properties of 5-15% depending on the nickel-iron ratio.
Main Applications
In aerospace, W-Ni-Fe sheets serve as counterweights in aircraft control surfaces and satellite components, where their high mass-to-volume ratio is critical. The medical industry utilizes them for collimators in CT scanners and shielding walls in radiation therapy rooms, replacing toxic lead alternatives. Industrial applications include boring bars for deep-hole drilling and wear plates for mining equipment. Military uses encompass armor-piercing projectile cores and vibration damping in naval systems. Emerging applications include neutrino detection in physics research and ballast in Formula 1 vehicles for weight distribution adjustments.
Safety and Storage
While W-Ni-Fe alloys are generally non-toxic compared to lead-based materials, dust generated during machining requires NIOSH-approved respirators. The sheets should be stored in low-humidity environments to prevent surface oxidation, preferably with desiccant packs in sealed containers. When cutting or welding, use local exhaust ventilation to capture fine particles. Although the alloy is stable under normal conditions, thermal decomposition above 1,500°C may release nickel fumes. Always handle sheets with edge protection due to their high density—a small 10x10 cm sheet can weigh over 1.5 kg, posing crushing hazards.
B2B Procurement Guide
When sourcing W-Ni-Fe sheets, specify the exact alloy composition (e.g., W93Ni5Fe2 vs. W90Ni7Fe3), as even slight variations affect machinability and density. Standard thickness ranges from 0.5mm to 50mm, with ±0.05mm tolerance for precision applications. Request mill certification showing traceability to ASTM B777 or AMS-T-21014 standards. For radiation shielding projects, verify the alloy's linear attenuation coefficient for your target energy range (e.g., 0.662 MeV for Cs-137). Leading manufacturers include Plansee, Midé Technology, and Tungsten Heavy Powder. MOQs typically start at 10 kg for standard sizes, with lead times of 4-6 weeks for custom dimensions. Consider third-party density testing for critical applications.
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