Overview
Molybdenum square sheets are precision-engineered materials prized for their exceptional thermal and mechanical properties. Composed of pure molybdenum or its alloys, these sheets are manufactured through powder metallurgy or rolling processes to achieve uniform thickness and flatness. Their high melting point and stability under extreme conditions make them indispensable in industries like semiconductor manufacturing and nuclear energy. As a refractory metal, molybdenum retains strength at elevated temperatures, outperforming many alternatives. Square sheets are typically available in thicknesses ranging from 0.1mm to 25mm, with custom dimensions for specialized applications. The material's low thermal expansion coefficient further enhances its reliability in precision environments.
Physical and Chemical Properties
Molybdenum sheets exhibit a unique combination of density (10.28 g/cm³) and ductility, allowing for machining into complex components. Their thermal conductivity (138 W/m·K at 20°C) surpasses most steels, enabling efficient heat dissipation in electronic substrates and furnace parts. The metal's corrosion resistance to molten metals and acids (except oxidizing agents) extends service life in harsh chemical environments. Notably, molybdenum maintains tensile strength up to 1,400°C, with a Vickers hardness of 150-250 HV depending on processing. Its electrical resistivity (5.34 × 10⁻⁸ Ω·m) supports applications in electrical contacts. However, oxidation occurs above 400°C in air, necessitating protective coatings or inert atmospheres for high-temperature use.
Main Applications
In electronics, molybdenum sheets serve as substrates for LED and power semiconductor devices due to their matched thermal expansion with silicon. The aerospace industry utilizes them in rocket nozzles and turbine blades, where temperatures exceed 1,500°C. Glass manufacturing employs these sheets as electrodes in melting furnaces for their resistance to molten glass corrosion. Medical imaging systems incorporate molybdenum in X-ray tube anodes, capitalizing on its high atomic number for efficient radiation generation. Nuclear applications include control rod cladding and radiation shields. Emerging uses include additive manufacturing powders and thin-film solar cell back contacts, leveraging molybdenum's reflectivity and stability.
Safety and Storage
While solid molybdenum sheets pose minimal risk, machining generates dust that may cause respiratory irritation. OSHA recommends P2 respirators and local exhaust ventilation during grinding or cutting. Store sheets in sealed containers with desiccants to prevent surface oxidation; argon gas purging is advised for long-term storage of high-purity grades. Firefighting requires Class D extinguishers for molybdenum powder, though solid sheets are non-flammable. Disposal should follow local metal recycling regulations, as molybdenum is not classified as hazardous waste. For high-temperature applications, ensure proper workplace controls to prevent burns from heated components.
B2B Procurement Guide
Industrial buyers should prioritize ASTM B386 standards for wrought molybdenum products, specifying requirements like: Grade 361 (99.95% purity) for critical applications, or Grade 364 (99.9%) for cost-sensitive uses. Key procurement parameters include: thickness tolerance (±5% typical), surface finish (Ra <0.8µm for electronic grades), and flatness (<0.5mm/meter). Leading suppliers include Plansee Group, H.C. Starck, and Molymet. Request mill test reports verifying composition and mechanical properties. For large orders (500kg+), negotiate bulk discounts; spot market prices fluctuate with tungsten supply chains. Consider Mo-La or TZM alloy sheets for enhanced creep resistance in furnace applications. Lead times range from 2-8 weeks for custom sizes.
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