Molybdenum News Center

The refractory metal of tungsten has the highest melting point(3410℃)among all metals,high specific mass(19.3 g/cm3),good erosion resistance,and low release of gases.It is a candidate material for many defense and high temperature structuralapplications.Also,it can be used as protective coatings for nuclear fusion reactors.

 

The properties of tungsten and molybdenum coatings deposited by thermal spray are related to their microstructures and oxidation behaviors.Coating microstructures and oxidation behaviors are determined by spray conditions including spray distance,substrate temperature,chamber pressure,etc.

 

Spray distance influences coating porosity and thus wear resistance.Molybdenum oxides formed in thecoating is generally attributed to the oxidation of molybdenum during both flight and deposition.For a high temperature substrate,the oxidation on the surface of Mo splats/laminae during deposition has a comparable contribution to the oxide content in the coating。

 

But for deposition on a low temperature substrate most of oxides in the coating come from the oxidation of in-flight particles.Low pressure plasma spray(LPPS)under argon atmosphere has been used to deposit molybdenum and tungsten coatings on different substrates.The porosity of tungsten coating produced by low pressure plasma spray process is affected by the melting,flattening and stacking behaviors of tungsten particles.To increase coating density,the particles of fed-in powder should be complete melting,sufficient flattening,and regular overlapping on substrate.

 

 

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