Polished Round Molybdenum Rod
- High purity Mo ≥ 99.95% (3N5 grade) for minimal contamination
- Polished surface with mirror-like finish (Ra ≤0.4μm) for reduced friction and clean contact
- High melting point 2610°C–2620°C for extreme high-temperature service
- Density 10.2 g/cm³ with excellent dimensional stability
- Low coefficient of thermal expansion (5.1×10⁻⁶/K) for high-precision parts
- Excellent thermal conductivity (~138 W/m·K) for efficient heat dissipation
- Good electrical conductivity for electrode and heating element applications
Description Of Polished Round Molybdenum Rod
Polished Round Molybdenum Rod is a high-purity refractory metal product manufactured from molybdenum powder through powder metallurgy, sintering, and subsequent thermo-mechanical processing such as forging, swaging, or rolling. The “Polished Round” designation indicates that the rod has been precision ground and then polished to achieve a smooth, mirror-like surface finish with low surface roughness (Ra ≤0.4μm). The “Round” indicates a circular cross-section with uniform diameter along the length. The high purity level (Mo ≥ 99.95%, 3N5 grade) ensures minimal contamination in critical high-temperature and semiconductor applications. The material is also designated as Grade Mo1 per ASTM B387 and GB/T 4188-2017 standards.
Molybdenum possesses a unique combination of properties that make it indispensable in high-temperature industrial applications. With a melting point of 2610°C–2620°C, a density of 10.2 g/cm³, excellent thermal conductivity (~138 W/m·K), and a low coefficient of thermal expansion (5.1×10⁻⁶/K), polished molybdenum rods deliver reliable performance in the most demanding thermal environments. The polished surface further enhances performance by reducing friction, improving corrosion resistance, and ensuring clean, consistent electrical and thermal contact.
The manufacturing process begins with high-purity molybdenum powder (Mo ≥ 99.95%), which is pressed into bar blanks and sintered at high temperatures. The sintered bars are then processed through forging, swaging, or rolling to achieve the desired density and mechanical properties. Finally, the bars undergo precision centerless grinding followed by mechanical polishing or electrolytic polishing to achieve the specified diameter, straightness, and mirror-like surface finish. The polished surface can achieve Ra ≤0.4μm, with even finer finishes available upon request.
Polished round molybdenum rods are primarily used in semiconductor ion implantation components, high-temperature furnace heating elements and support rods, glass melting electrodes, and medical equipment.
Features Of Polished Round Molybdenum Rod
High Purity (Mo ≥ 99.95%): Ensures minimal contamination in critical applications such as semiconductor manufacturing and medical equipment. Impurity limits are strictly controlled per ASTM B387.
Polished Mirror-Like Surface: The rod is precision ground and polished to achieve a smooth surface with Ra ≤0.4μm. This reduces friction, improves corrosion resistance, and ensures clean, consistent electrical and thermal contact.
High Melting Point: With a melting point of 2610°C–2620°C, polished molybdenum rods maintain stability in extreme high-temperature environments without melting or deformation.
Excellent Thermal Conductivity: Thermal conductivity of approximately 138 W/m·K at 20°C enables efficient heat transfer, making molybdenum ideal for heating elements and heat dissipation applications.
Low Coefficient of Thermal Expansion: With a coefficient of thermal expansion of 5.1×10⁻⁶/K, polished molybdenum rods exhibit excellent dimensional stability under thermal cycling.
Good Electrical Conductivity: Molybdenum offers good electrical conductivity (resistivity ~5.7 µΩ·cm at 20°C), suitable for electrode and heating element applications.
High Strength at Elevated Temperatures: Molybdenum maintains good mechanical strength and creep resistance at high temperatures, ensuring structural integrity under sustained thermal loads.
Corrosion Resistance: Molybdenum resists corrosion from most chemical media including acids, alkalis, and salts, and offers excellent resistance to molten glass and many molten metals.
Good Machinability: Molybdenum can be machined using carbide tooling, and is easier to machine than tungsten, enabling precise dimensions and surface finishes.
Specifications Of Polished Round Molybdenum Rod
| Parameter | Specification |
|---|---|
| Material | Pure molybdenum (Mo) |
| Grade | Mo1 (3N5) |
| Purity | Mo ≥ 99.95% |
| Density | 10.2 g/cm³ (typical 10.20–10.28 g/cm³) |
| Melting Point | 2610°C – 2620°C |
| Boiling Point | ~5560°C |
| Operating Temperature | 1100°C – 2000°C |
| Thermal Conductivity | ~138 W/(m·K) at 20°C |
| Coefficient of Thermal Expansion | 5.1×10⁻⁶/K |
| Electrical Resistivity | ~5.7 µΩ·cm at 20°C |
| Tensile Strength | 485 – 690 MPa (depending on condition) |
| Yield Strength | 415 – 550 MPa (depending on condition) |
| Hardness (Vickers) | 200 – 250 kgf/mm² |
| Elastic Modulus | ~325 GPa |
| Surface Finish | Polished, Ra ≤0.4μm; ground Ra ≤0.8μm available |
| Diameter Range | 0.8 – 150 mm (customizable) |
| Length | Up to 1500 mm (customizable) |
| Diameter Tolerance | ±0.05 mm (<10 mm), ±0.1 mm (>10 mm) |
| Straightness | ≤0.5 mm/m (standard); ≤0.2 mm/m (high-precision) |
| Standard Compliance | ASTM B387, GB/T 4188-2017 |