Molybdenum foil is a thin sheet made from molybdenum (Mo, atomic number 42), typically produced via powder metallurgy or rolling, known for its high melting point, excellent mechanical properties, and chemical stability. With a density of 10.28 g/cm³ and a melting point of 2623°C, molybdenum foil maintains performance in extreme high-temperature environments. Thickness ranges from 0.1-2 mm, with polished or acid-washed surfaces, and purity typically from 99% to over 99.95%, with high-purity foil (≥99.95%) used in precision applications.
Physical and Mechanical Properties: Molybdenum foil has a tensile strength of 500-1000 MPa at room temperature (higher for cold-rolled), hardness of 150-200 HV, and moderate ductility (elongation 10-20%). It has low toughness at low temperatures, prone to brittle fracture. Its low thermal expansion coefficient (4.8 × 10⁻⁶/K) matches materials like silicon and sapphire, ideal for high-temperature precision components. Thermal conductivity (138 W/m·K) and electrical conductivity (1.87 × 10⁷ S/m) support heat management and current transmission.
Chemical Properties: At room temperature, it resists dilute acids (e.g., hydrochloric acid), alkalis, and water, outperforming iron, but is sensitive to oxidizing acids (e.g., concentrated nitric acid). Above 600°C, it oxidizes to form volatile MoO₃, requiring vacuum or inert gas protection. It offers strong creep resistance, maintaining strength (100-200 MPa) at 1000-2000°C.
Classification and Manufacturing: Molybdenum foil is classified by purity into high-purity (≥99.95%), standard (99-99.9%), and low-purity (<99%), and by process into cold-rolled, hot-rolled, annealed, or powder metallurgy products. Cold-rolled foil is stronger, hot-rolled is tougher, and powder metallurgy suits complex shapes. Applications: Molybdenum foil is used in electronics (semiconductor substrates, sputtering targets), aerospace (rocket nozzles), high-temperature furnaces (reflective screens, heating strips), chemicals (acid-resistant equipment), and sapphire crystal growth (cover plates). Its high-temperature stability, wear resistance, and thermal matching are key advantages, though oxidation sensitivity and high cost are considerations. Quality Control: Production involves spectral analysis, mechanical testing, microscopic inspection, and surface morphology analysis to ensure purity, performance, and dimensional accuracy. The WeChat public account "China Tungsten Online" updates the prices of various tungstates such as tungstates such as tungstate powder, ammonium tungstate, tungsten products, high-density tungsten alloys, cemented carbides, tungsten concentrates, etc. on a daily basis. At the same time, it provides the most professional WeChat group in the industry for everyone to exchange supply and demand information, and you can exchange information about tungsten powder at any time. Follow "China Tungsten Online" and join the China Tungsten Online WeChat exchange group. Daily tungsten product prices and supply and demand information will be delivered in a timely manner, and real-time communication will be carried out. For more tungsten product market trends, products and information, please follow the "China Tungsten Online" WeChat public account, or visit news.molybdenum.com.cn to obtain daily updated information.
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