Overview
Tungsten blocks are solid forms of pure tungsten or tungsten alloys, valued for their exceptional density and thermal stability. As one of the hardest and most refractory metals, tungsten maintains structural integrity at temperatures exceeding 3,000ยฐC, making it indispensable in extreme environments. Industrial-grade tungsten blocks typically exceed 99.95% purity, with specialized grades (e.g., doped tungsten for improved ductility) available for niche applications. The materialโs cubic crystalline structure contributes to its remarkable mechanical strength and radiation absorption capabilities.
Physical and Chemical Properties
Tungstenโs density (19.25 g/cmยณ) rivals that of gold, while its melting point (3,422ยฐC) is the highest among pure metals. This combination enables effective gamma-ray shielding, outperforming lead by volume efficiency. The metal exhibits low thermal expansion and superior creep resistance under stress. Chemically, tungsten resists corrosion from acids, alkalis, and molten metals, though it oxidizes slowly in air above 400ยฐC. Its electrical conductivity (30% of copperโs) and electron emission properties make it ideal for electrodes and vacuum tube components.
Main Applications
In aerospace, tungsten blocks serve as counterweights and rocket nozzle linings. The medical field utilizes them for collimators in radiation therapy machines due to precise attenuation properties. Industrial applications include EDM electrodes, furnace components, and welding dies. Emerging uses include nuclear fusion reactor shielding and additive manufacturing feedstock. High-energy physics facilities employ tungsten blocks as beam stops and target backings, leveraging their high-Z atomic structure for particle interaction studies.
Safety and Storage
Solid tungsten blocks pose minimal risk, but machining generates inhalable dust classified as a Group 2A carcinogen. Facilities must implement local exhaust ventilation and mandate respirators (NIOSH P100 filters) during processing. Store blocks away from peroxides and strong oxidizers to prevent exothermic reactions. For long-term storage, coat blocks with anti-tarnish solutions or store in argon-filled containers to prevent surface oxidation. Moisture control is unnecessary given tungstenโs water resistance.
B2B Procurement Guide
Specify dimensional tolerances (typically ยฑ1mm for standard blocks) and surface finish requirements (e.g., ground or polished). For radiation applications, request neutron activation analysis reports to confirm low impurity levels (<50ppm for critical elements like cobalt). Leading suppliers include Plansee Group, Buffalo Tungsten, and Mid-West Tungsten. MOQs often start at 5kg, with lead times of 2โ8 weeks for custom dimensions. Consider CIP or DAP incoterms to manage logistics costs for this high-density material.
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