Chemically Vapor Deposited Tungsten Coatings for Erosion Protection,
WATERVLIET ARSENAL N Y BENET WEAPONS LAB
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Erosion resistant, chemically vapor deposited tungsten coatings can be applied to steel at temperatures below the tempering temperature. A nickel inner layer is used to promote adherence. These coatings increase the erosion life of steel by at least a factor of ten however, because of the high thermal conductivity of tungsten they increase the heat absorption. Their resistance to thermal fatigue can be improved by refining the columnar grain structure. The tungsten coatings may be significantly improved by an addition of silicon introduced as silane in the reactant gas mixture. The resultant silicon-alloyed tungsten coating is fine grained, has a lower thermal conductivity and hence lower heat absorption, and may be applied at much lower temperatures.
- Coatings, Colorants and Finishes
- Metallurgy and Metallography