High-purity molybdenum foil (≥99.95% purity) is produced through advanced purification processes, such as electron beam or zone melting, with minimal impurities (e.g., carbon, oxygen, nitrogen, iron) below 50 ppm. This high purity imparts excellent chemical stability, conductivity, and oxidation resistance, ideal for demanding applications. Physically, it has a density of 10.28 g/cm³, tensile strength of 500-700 MPa, hardness of 150-200 HV, and moderate ductility (elongation 10-20%). Its creep resistance excels at 1000°C-2000°C, suitable for high-temperature furnace components. Chemically, it resists dilute acids and alkalis at room temperature but requires vacuum or inert gas protection above 600°C due to MoO₃ formation in oxidizing environments. High purity reduces grain boundary defects, enhancing toughness and fatigue performance (fatigue strength ~250-350 MPa), with superior surface quality for precision machining. Applications include semiconductor manufacturing (e.g., sputtering targets, substrates), vacuum furnace heating elements, and aerospace high-temperature components, where low impurities ensure consistent performance. Production costs are high, but its reliability is unmatched in high-end fields. High-temperature oxidation requires protection, with coatings or inert atmospheres extending lifespan. Purity is verified via spectral analysis to meet standards.
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