Coatings on Refractory Metals
The term “refractory metals” is used generally to include those metals which melt above the melting point of chromium – 3405°F or 1875°C, the most refractory being tungsten (see Ref.1 and Table 1). The rare and noble refractory metals are normally not used in structural applications because of limited availability leaving, unfortunately, the least oxidation resistant metals of the family for high temperature structural applications (see Fig. 1). As we become increasingly aware of the aerothermodynamic impositions on a vehicle attempting to leave or reenter the air atmosphere, we can vividly see why the designer is seeking new structural materials.
KeywordsRefractory Metal Oxidation Protection Pack Cementation Battelle Memorial Institute Reentry Vehicle
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