Abstract
A dual planar magnetron sputtering unit with a fast atom beam (FAB) source has been used to deposit crack-free metal and alloy coatings of chromium, niobium and tantalum on gun steel substrates. Coatings virtually free from nodular defects were obtained by alternately coating and bombarding the surface with excited atoms from the FAB source or by coating at high deposition rates. Scanning electron microscopy was used to characterize the coatings. Flat plates, rifled flat plates, the inside of rifled tubes and a rifled liner were coated. Generally, for the rifled tubes an open columnar type structure was obtained. By bombarding with the FAB source together with depositing a particular alloy combination, however, a dense coherent coating was produced. Firing trials of an alloy coated gun barrel liner have also been carried out.
Published Version
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