Molybdenum foil’s high strength is primarily demonstrated in its tensile strength, hardness, and creep resistance, making it ideal for high-load and high-temperature environments. 1) Tensile Strength: 500-1000 MPa at room temperature, with cold-rolled foil reaching 800-1000 MPa and hot-rolled 500-700 MPa, surpassing aluminum (100-200 MPa) and nearing steel, supporting semiconductor substrates and aerospace parts. 2) Hardness: 150-200 HV, offering strong wear resistance for molds, piercing tools, and furnace components, enduring mechanical stress. 3) Creep Resistance: Maintains 100-200 MPa strength at 1000-2000°C, far outperforming copper (melting point 1085°C), ideal for sapphire growth furnaces and rocket nozzles. 4) Processing Enhancement: Cold rolling refines grains via work hardening, boosting strength; post-annealing strength remains high (500-700 MPa). High-purity foil (≥99.95%) offers stabler strength due to fewer impurities and grain boundary defects, while low-purity foil (<99%) may have reduced strength from impurities. Oxidation above 600°C requires vacuum protection to prevent MoO₃ formation, which impacts strength. Quality control involves tensile testing (±1 MPa precision), hardness testing, and microscopic analysis to ensure uniform grains. Molybdenum foil’s high strength, combined with low thermal expansion (4.8 × 10⁻⁶/K) and thermal conductivity (138 W/m·K), excels in electronics, aerospace, and high-temperature applications, requiring optimized processing to avoid low-temperature brittleness.
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