Description
Molybdenum rod is a rod-shaped material made of molybdenum metal, which is widely used in extreme environments such as high temperature and corrosion resistance due to its excellent physical and chemical properties. The following is key information about molybdenum rods:
1. Characteristics of Molybdenum Rod
🔹High melting point: Molybdenum has a melting point of 2623 ° C, which is one of the highest melting points among known metals and is suitable for ultra-high temperature environments.
🔹Excellent thermal and electrical conductivity: second only to silver and copper, commonly used in high-temperature electrodes or heat exchange components.
🔹Low thermal expansion coefficient: It can maintain structural stability at high temperatures and has good thermal shock resistance.
🔹Good corrosion resistance: resistant to acid and alkali corrosion (except aqua regia), strong oxidation resistance at high temperatures.
🔹High strength and hardness: but low ductility, requiring special processing techniques.
2. Main application areas
✔High temperature industry
Electric furnace heating element: used for high-temperature equipment such as vacuum furnaces and atmosphere furnaces, replacing graphite or tungsten.
Glass/ceramic sintering: As a supporting or fixing component, it can withstand high temperatures and does not contaminate materials.
✔electronics industry
Electrode material: used for electrodes in electrical discharge machining and semiconductor manufacturing.
Integrated circuit heat sink: utilizing its high thermal conductivity.
✔Steel and Metallurgy
Inner lining of continuous casting crystallizer: resistant to high temperature erosion of molten steel.
Steelmaking additives: improve the toughness and wear resistance of steel.
✔Aerospace:
High temperature structural components, nozzles, heat shields, etc.
✔Lighting and Research:
Bracket for halogen lamps or high-pressure gas lamps, or high-temperature crucible for experiments.
3. Manufacturing process
Powder metallurgy method: Molybdenum powder is pressed into shape, sintered at high temperature, and then processed into bars through forging or rolling.
Work hardening: Molybdenum rods can be formed through mechanical processing (such as turning, grinding), but their brittleness should be noted.
Purity level: Usually purity ≥ 99.95%, with strict impurity control to avoid performance degradation.
4. Advantages and disadvantages
🔹 advantage:
High temperature resistance, corrosion resistance, and good thermal and electrical conductivity.
Low coefficient of linear expansion and strong high-temperature stability.
🔹Disadvantages:
It is prone to brittle fracture at low temperatures and has high processing difficulty.
Expensive in price, with costs higher than ordinary metals.
5. Precautions
Molybdenum rods are brittle at room temperature and should be avoided from severe impact or bending.
When used at high temperatures, it is necessary to prevent oxidation (which can be protected by coating with rhenium or zirconium).
Welding is difficult, usually using riveting or mechanical connections.
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