Abstract
Stainless-steel coatings were deposited on titanium alloy (Ti-5Al-2.5Sn) plates by electron-beam vacuum evaporation of stainless-steel source materials. The effect of source material feeding on the composition of the coating is reported. The effects of the substrate surface condition and temperature, the deposition rate, and heat treatment on the adherence and quality of the coating are presented and discussed. The function of the stainless-steel coating is to protect the titanium alloy from reaction in a liquid oxygen environment. Both cryogenic and room-temperature properties of the stainless-steel-coated titanium are reported. Results of investigations of the effectiveness of the coating in protecting the alloy from liquid oxygen showed excellent protection in mechanical impact tests of purposely defected specimens. The effects of the coating on the mechanical properties of the substrate material, including tensile strength and fatigue, are presented.
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