Producing heating strips for vacuum furnaces requires molybdenum foil with high conductivity and temperature stability. The process includes: 1) Material Selection: High-purity (≥99.95%) cold-rolled or hot-rolled molybdenum foil (0.1-0.5 mm thick) with conductivity of 1.87 × 10⁷ S/m and tensile strength of 500-1000 MPa is chosen. 2) Cutting: Laser cutting or stamping shapes the foil into strips (5-50 mm wide), with ±0.01 mm precision to ensure consistent resistance. 3) Forming: Bending or stamping creates corrugated or spiral structures to increase heating area, followed by annealing (800-1200°C, vacuum) to relieve stress and enhance ductility (10-20%). 4) Surface Treatment: Acid washing removes oxides, and polishing (roughness Ra<0.1 μm) reduces resistance. 5) Assembly: Strips are fixed in the furnace via molybdenum bolts or welding, connected to power. Molybdenum’s high melting point (2623°C) and high-temperature strength (100-200 MPa at 1000°C) support stable heating at 1500-2000°C. Thermal conductivity (138 W/m·K) ensures uniform heat. Vacuum environments prevent oxidation above 600°C. Quality control includes resistance testing, microscopic analysis, and high-temperature performance checks to ensure heating efficiency. Advantages include efficient heating and long lifespan; disadvantages are complex processing and high cost. Heating strips are widely used in vacuum heat treatment furnaces.
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