Producing connectors (e.g., bolts, gaskets) for vacuum furnaces using molybdenum foil requires attention to high-temperature strength, processing precision, and chemical stability. Key considerations include: 1) Material Selection: High-purity (≥99.95%) cold-rolled molybdenum foil (0.5-2 mm thick) with tensile strength of 800-1000 MPa and hardness of 160-200 HV ensures mechanical strength. 2) Processing Precision: Laser cutting or CNC machining with ±0.01 mm precision prevents stress concentration; threading requires high accuracy to avoid loosening. 3) Surface Treatment: Acid washing removes oxides, and polishing (roughness Ra<0.1 μm) reduces contact resistance and corrosion. 4) High-Temperature Performance: Connectors must withstand 1500-2000°C, with creep resistance critical; annealing (800-1200°C) optimizes ductility (10-20%). 5) Chemical Stability: Oxidation above 600°C forms MoO₃, requiring vacuum or inert gas protection; surface coatings (e.g., silicides) enhance oxidation resistance. 6) Assembly: Connectors must tightly integrate with heating elements and screens, with mechanical testing verifying endurance. 7) Quality Control: Spectral analysis checks purity, microscopic inspection examines grain structure, and fatigue testing (strength 250-350 MPa) ensures lifespan. Molybdenum connectors ensure furnace structural stability, with thermal conductivity (138 W/m·K) aiding heat management. Advantages include high strength and temperature resistance; disadvantages are processing complexity and high cost.
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