Producing reflective screens for vacuum furnaces requires high-purity (≥99.95%) molybdenum foil with excellent surface quality to ensure efficient heat reflection and high-temperature stability. The process includes: 1) Material Selection: Cold-rolled molybdenum foil (0.2-1 mm thick) with tensile strength of 800-1000 MPa, hardness of 160-200 HV, and polished surface (roughness Ra<0.1 μm) is chosen. 2) Cutting: Laser or waterjet cutting shapes the foil into circular or curved screens per furnace design, with ±0.01 mm precision. 3) Forming: Stamping or bending creates reflective structures, followed by annealing (800-1200°C, vacuum) to relieve stress and maintain ductility (10-20%). 4) Surface Treatment: Chemical cleaning removes oxides, and polishing enhances reflectivity (>90% for infrared light). 5) Assembly: Screens are fixed using molybdenum bolts or welding, ensuring uniform spacing from heating elements. Molybdenum’s high melting point (2623°C) and thermal conductivity (138 W/m·K) enable stable reflection at 1500-2000°C, reducing energy consumption. Its low thermal expansion coefficient (4.8 × 10⁻⁶/K) minimizes deformation. Vacuum environments prevent oxidation above 600°C. Quality control includes surface flatness testing, spectral analysis, and high-temperature performance checks to ensure screen durability. Advantages include efficient reflection and stability; disadvantages are high processing costs.
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