Molybdenum foil used in aerospace is characterized by high-temperature strength, creep resistance, and low thermal expansion, ideal for rocket nozzles, turbine blade supports, and high-temperature structural components. Typically high-purity (≥99.95%), produced via powder metallurgy or cold rolling, it has a density of 10.28 g/cm³, tensile strength of 500-700 MPa (up to 800-1000 MPa for cold-rolled), and hardness of 150-200 HV. Its high-temperature performance is exceptional, maintaining 100-200 MPa strength at 1000-2000°C with excellent creep resistance, surpassing aluminum (melting point 660°C) or copper (melting point 1085°C), suitable for extreme thermal environments. A low thermal expansion coefficient (4.8 × 10⁻⁶/K) matches ceramics or composites, reducing thermal stress and ensuring structural stability. Thermal conductivity (138 W/m·K) aids heat management, with moderate ductility (elongation 10-20%). Chemically, it resists dilute acids and alkalis at room temperature but forms MoO₃ above 600°C in oxidizing environments, requiring vacuum or inert gas protection; surface coatings (e.g., silicides) can enhance oxidation resistance. Fatigue strength (250-350 MPa) supports dynamic loads. Applications demand high-precision machining, with polished surfaces to minimize defects. Advantages include high-temperature stability and strength; disadvantages are poor low-temperature toughness and oxidation sensitivity. Quality control involves mechanical testing and microscopic analysis to ensure aerospace reliability.
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