Molybdenum foil exhibits excellent high-temperature creep resistance, performing well at 1000-2000°C, ideal for furnaces, aerospace, and sapphire crystal growth. Creep, the slow deformation under constant high-temperature stress, is minimized by molybdenum’s high melting point (2623°C) and body-centered cubic structure. 1) High-Temperature Strength: Tensile strength is ~200-300 MPa at 1000°C, maintaining 100-200 MPa at 2000°C, far surpassing aluminum (melting point 660°C) or copper (1085°C). 2) Creep Rate: Low rates (10⁻⁶-10⁻⁵/s) at 1000-1500°C, slightly increasing but manageable at 1500-2000°C. 3) Purity Impact: High-purity foil (≥99.95%) resists creep better due to fewer impurities and reduced grain boundary sliding; low-purity foil (<99%) may see accelerated creep from impurities. 4) Processing: Cold-rolled foil’s finer grains slightly enhance creep resistance compared to hot-rolled; doping (e.g., molybdenum-lanthanum alloys) further improves performance. 5) Environmental Requirements: Oxidation above 600°C, forming MoO₃, requires vacuum or inert gas protection to prevent creep acceleration. Testing uses high-temperature creep experiments, with ±0.1% precision. Molybdenum foil’s creep resistance ensures reliability under high-temperature loads (e.g., rocket nozzles, furnace components), with quality control via microscopic analysis and mechanical testing optimizing performance.
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