Classifying molybdenum foil by application field is based on its functionality and performance requirements across industries, primarily including electronics, metallurgy, aerospace, chemical, and high-temperature furnace applications. 1) Electronics industry foil is used in semiconductor manufacturing (e.g., sputtering targets, substrates), requiring high purity (≥99.95%), smooth surfaces, and low thermal expansion (4.8 × 10⁻⁶/K) to match silicon. 2) Metallurgy industry foil is employed in molds, piercing tools, and high-temperature alloy additives, needing high hardness (150-200 HV), wear resistance, and creep resistance. 3) Aerospace foil is used in rocket nozzles and turbine blade supports, emphasizing high-temperature strength (100-200 MPa at 1000-2000°C) and oxidation resistance, requiring vacuum or inert gas protection. 4) Chemical industry foil is used in acid-resistant equipment (e.g., reaction vessels), demanding corrosion resistance, resisting dilute acids and alkalis at room temperature but avoiding oxidizing acids. 5) High-temperature furnace foil serves as heating elements and shielding, requiring a high melting point (2623°C) and creep resistance, typically operating in vacuum or inert atmospheres. Classification considers purity, mechanical properties, surface quality, and environmental adaptability, with electronics prioritizing purity, metallurgy and aerospace focusing on strength, and furnaces emphasizing heat resistance. Selection balances cost and performance, with high-purity foil being costly but reliable, and standard foil (99-99.9%) offering cost-effectiveness for general applications.
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