Molybdenum Alloy
Molybdenum alloy has excellent strength and mechanical stability at high temperatures (up to 1900°C). Their highductility and toughness provide a greater tolerance for imperfections and brittle fracture than ceramics.
The unique properties of molybdenum alloy are utilised in many applications:
High temperature heating elements, radiation shields, extrusions, forging dies, etc;
Rotating X-ray anodes used in clinical diagnostics;
Glass melting furnace electrodes and components that are resistant to molten glass;
Heat sinks with thermal expansivity matching silicon for semiconductor chip mounts;
Sputtered layers, only Ångstroms (10-7 mm) thick, for gates and interconnects on integrated circuit chips;
Sprayed coatings on automotive piston rings and machine components to reduce friction and improve wear.
For specialised applications, Mo is alloyed with many other metals:
Tungsten molybdenum alloy are noted for exceptional resistance to molten zinc;
Mo is clad with copper to provide low expansion and high conductivity electronic circuit boards;
Mo-25% rhenium alloys are used for rocket engine components and liquid metal heat exchangers which must be ductile at room temperature.
Molybdenum Alloy and Materials Systems |
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| System | Example | Properties of Interest |
| Pure Mo | 99.95 wt % Mo | Elevated temperature strength, thermal conductivity, thermal expansion |
| Substitutional alloys | Mo-W | Improved hot strength;Zn corrosion resistance |
| Mo-Re | Improved low temperature ductility | |
| Carbide-stabilized alloys | TZM | Improved hot strength and creep resistance |
| MHC | Higher hot strength and creep resistance than TZM | |
| Oxide-dispersed systems | La2O3 (ML,ODS-Mo) | Outstanding hot strength and creep resistance |
| Y2O3(MY) | Outstanding hot strength, creep resistance | |
| Other systems | Cu-Mo-Cu laminate | Engineered thermal properties |
| Mo-Ni laminate | Solderability | |
| Mo-Cu powder composite | Isotropic engineered thermal properties | |
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