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Molybdenum Straight Wire
Available Configurations
Properties common to all products in this list
| Diameter | Length | Other Variant |
|---|---|---|
| 0.25 mm to 1 mm | 0.1 m to 1 m | Spooled wire |
Need custom configurations? Please contact us.
Key Features
Molybdenum Straight Wire provides cut, dimensionally stable lengths of this refractory transition metal, combining a melting point of 2,617 °C, high stiffness, and low thermal expansion in a form suited to applications requiring a precisely defined, rigid wire element:
Melting Point 2,617 °C and Dimensional Stability Under Thermal Load
A melting point of 2,617 °C and high resistance to creep allow molybdenum straight wire to bridge defined spans in furnace and vacuum equipment without deflecting under sustained thermal and mechanical load.
Low Coefficient of Thermal Expansion Matched to Ceramics and Glasses
Molybdenum’s low coefficient of thermal expansion is closely matched to several ceramic and glass materials, making it well suited as a feedthrough and support element in glass-to-metal seals and vacuum envelopes where differential thermal expansion would otherwise cause seal failure.
Straight, Cut-Length Format for Direct Assembly
The straight, cut-length format provides a precisely defined wire element for direct integration into electrode assemblies, vacuum tube structures, furnace supports, and deposition system components without further straightening or preparation.
High Stiffness for Structural Wire Applications
Molybdenum’s high elastic modulus gives the straight wire the rigidity needed for support pins, mandrels, and structural elements in vacuum tube and semiconductor processing equipment where the wire must hold a defined geometry under mechanical and thermal load.
Low Vapor Pressure for Vacuum Compatibility
Low vapor pressure at high temperatures ensures that molybdenum straight wire does not contribute to vacuum contamination or deposit on sensitive surfaces in deposition systems and vacuum apparatus where outgassing control is critical.
Industrial Applications
Molybdenum Straight Wire is used wherever a precisely dimensioned, rigid refractory metal wire element must hold its geometry under sustained thermal and mechanical load:
- ✦ TIG Welding Electrodes for Refractory Metal Joining
- Applied as TIG welding electrodes for refractory metal joining, where the combination of high melting point, good electrical conductivity, and the mechanical rigidity of the straight wire format supports reliable arc welding of molybdenum, tungsten, and related materials.
- ✦ Support Pins and Mandrels in Vacuum Tube and Semiconductor Processing Equipment
- Used as support pins and mandrels in vacuum tube manufacture and semiconductor processing equipment, where high stiffness and dimensional stability under thermal load maintain the defined geometry required for consistent device fabrication.
- ✦ Glass-to-Metal Seal Feedthroughs and Vacuum Envelope Elements
- Applied as feedthrough and structural elements in glass-to-metal seals and vacuum envelopes, where the coefficient of thermal expansion closely matched to certain glasses and ceramics minimizes thermally induced stress and supports reliable hermetic seal integrity.
- ✦ Localised Resistance Heating Elements
- Used as resistance heating elements for localised high-temperature applications in research apparatus, where the straight wire format allows precise placement of the heating zone and dimensional stability under thermal cycling maintains reproducible heating geometry.
- ✦ Substrate for Surface Science and Deposition Systems
- Applied as a substrate for surface science investigations and as a support structure in deposition systems, where dimensional stability of the wire element at process temperature directly affects experimental reproducibility and the low vapor pressure prevents vacuum contamination.
Material Properties
| Element | Value |
|---|---|
| Atomic number | 42 |
| Crystal structure | Body centred cubic |
| Electronic structure | Kr 4d⁵ 5s¹ |
| Valences shown | 2, 3, 4, 5, 6 |
| Atomic weight( amu ) | 95.94 |
| Thermal neutron absorption cross-section( Barns ) | 2.65 |
| Photo-electric work function( eV ) | 4.2 |
| Natural isotope distribution( Mass No./% ) | 95/ 15.9 |
| Natural isotope distribution( Mass No./% ) | 96/ 16.7 |
| Natural isotope distribution( Mass No./% ) | 98/ 24.1 |
| Natural isotope distribution( Mass No./% ) | 97/ 9.6 |
| Natural isotope distribution( Mass No./% ) | 92/ 14.8 |
| Natural isotope distribution( Mass No./% ) | 94/ 9.3 |
| Natural isotope distribution( Mass No./% ) | 100/ 9.6 |
| Atomic radius - Goldschmidt( nm ) | 0.14 |
| Ionisation potential( No./eV ) | 2/ 16.15 |
| Ionisation potential( No./eV ) | 5/ 61.2 |
| Ionisation potential( No./eV ) | 68 |
| Ionisation potential( No./eV ) | 1/ 7.10 |
| Ionisation potential( No./eV ) | 3/ 27.2 |
| Ionisation potential( No./eV ) | 4/ 46.4 |
| Element | Value |
|---|---|
| Material condition | Hard |
| Material condition | Soft |
| Poisson's ratio | 0.293 |
| Poisson's ratio | 0.293 |
| Bulk modulus( GPa ) | 261.2 |
| Bulk modulus( GPa ) | 261.2 |
| Tensile modulus( GPa ) | 324.8 |
| Tensile modulus( GPa ) | 324.8 |
| Hardness - Vickers( kgf mm⁻² ) | 250 |
| Hardness - Vickers( kgf mm⁻² ) | 200 |
| Tensile strength( MPa ) | 485-550 |
| Tensile strength( MPa ) | 620-690 |
| Yield strength( MPa ) | 550 |
| Yield strength( MPa ) | 415-450 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 5.7@20°C |
| Superconductivity critical temperature( K ) | 0.915 |
| Temperature coefficient( K⁻¹ ) | 0.00435@0-100°C |
| Thermal emf against Pt (cold 0C - hot 100C)( mV ) | 1.45 |
| Element | Value |
|---|---|
| Boiling point( C ) | 4612 |
| Density( gcm⁻³ ) | 10.22@20°C |
| Element | Value |
|---|---|
| Melting point( C ) | 2617 |
| Latent heat of evaporation( J g⁻¹ ) | 6153 |
| Latent heat of fusion( J g⁻¹ ) | 290 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 251@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 138@0-100°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 5.1@0-100°C |
Tolerances
| Diameter | ±10% | |
|---|---|---|
| Length | +5% / -1% |