Molybdenum AlloyMolybdenum 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
|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-Cu powder composite||Isotropic engineered thermal properties|
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