Desirable characteristics of refractory coatings for future projectile launchers include high wear resistance, high melting point, hardness, electrical conductivity, good adhesion, thermal stability, and high plasma resistance properties. Sputtered tantalum and tantalum compounds, such as tantalum nitride and tantalum carbide are being considered as future coatings to endure the high pressure, high temperature, and aggressive chemical environment of the bore. In this work, tantalum and tantalum carbide were reactively sputtered ...
The shortcomings encountered with conventional high contraction chromium coatings in gun bores during past investigations are reviewed. Changes in the application of chromium for improving its performance during firing are proposed. Recent developments on the application of low contraction chromium with a new plating process, effects of partially plated bores on accuracy, and the effects of rifling profile on the wear of chromium coatings are discussed. (Author)
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