Physically Capable
Powder molybdenum appears as dark powder with a metallic luster and is derived through chemical processes from molybdic trioxide or ammonium molybdate. Solid molybdenum, which is shaped from the raw powder, has a silvery-white appearance and is extremely hard to the touch, yet is more ductile than other refractory metals such as tungsten. The material has an incredibly high elastic modulus, making it a popular choice for many manufacturing applications. Molybdenum and its alloy family have a number of unique physical properties, such as high strength and resistance to expansion during conditions of elevated temperatures.
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Molybdenum Property & Value:
| Atomic Number | 42 |
| Atomic Weight | 95.94 |
| Group Volume | 9.41 |
| Lattice Type | Body Centered Cube |
| Natural Isotopes | 92, 94, 95, 96, 97, 98, 100 |
| Density at 20 °C | 10.22 gr/cc |
| Melting Point | 2610 °C |
| Boiling Point | 5560 °C |
| Linear Coefficient of Thermal Expansion | 4.9 x 10-6/°C |
| Thermal Conductivity | .35 cal/cm2/cm |
| Specific Heat | .061 cal/g/ °C |
| Electrical Conductivity | 30% IACS |
| Electrical Resistivity at 20 °C | 5.7 microhms-cm |
| Temperature Coefficient of Electrical Resistivity | .0046 per °C (0 – 100°C) |
| Tensile Strength (20 º) | 120,000 – 200,000 psi |
| Tensile Strength (500 °C) | 35,000 – 65,000 psi |
| Tensile Strength (1000 °C) | 20,000 – 30,000 psi |
| Modulus of Elasticity (20 °C) | 46 x 106 psi |
| Modulus of Elasticity (500 °C) | 41 x 106 psi |
| Modulus of Elasticity (1000 °C) | 39 x 106 psi |
| Poisson’s Ratio | 0.321 |
| Spectral Emissivity (0.65μ wavelength) | 0.37 (1000 °C) |
| Total Emissivity (at 1500 °C) | 0.19 |
| Total Emissivity (at 2000 °C) | 0.24 |
| Working Temperature | 1600 °C and less |
| Recrystallization Temperature | 900 °C – 1200 °C |
| Stress Relieving Temperature | 800 °C |