Molybdenum foil is widely used in vacuum furnaces due to its high melting point (2623°C), creep resistance, and chemical stability, with applications including reflective screens, heating strips, connectors, and shielding materials. 1) Reflective Screens: Molybdenum foil reflects heat, reducing energy consumption, requiring high purity (≥99.95%), 0.2-1 mm thickness, and polished surfaces (roughness Ra<0.1 μm). 2) Heating Strips: As heating elements, its conductivity (1.87 × 10⁷ S/m) and high-temperature strength (100-200 MPa at 1000°C) enable efficient heating. 3) Connectors: Molybdenum foil forms bolts and gaskets, with hardness (150-200 HV) resisting mechanical stress. 4) Shielding Materials: It isolates thermal radiation, with tensile strength (500-700 MPa) and ductility (10-20%) supporting forming. Vacuum furnaces operate at 1500-2000°C, where molybdenum remains stable in vacuum or inert gases, but oxidation above 600°C requires protection to prevent MoO₃ formation. Cold-rolled foil offers high strength (800-1000 MPa), while hot-rolled foil provides better toughness. Applications ensure uniform high temperatures and long service life. Advantages include high-temperature stability and reliable performance; disadvantages are high cost and oxidation sensitivity. Quality control involves spectral analysis, mechanical testing, and surface inspection to meet vacuum furnace standards.
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