Laser surface modification of titanium aluminides to improve oxidation resistance at elevated temperatures.

摘要

Ti{dollar}sb3{dollar}Al has low density and good mechanical strength at high temperature. But it also has major drawbacks such as low temperature brittleness and poor oxidation resistance at elevated temperatures.; The maximum use temperature of this material depends on the improvement of oxidation resistance rather than that of mechanical properties such as creep or strength.; Al{dollar}sb3{dollar}Ti has very good high temperature resistance because of its high contents of aluminum present. High aluminum contents makes protective Al{dollar}sb2{dollar}O{dollar}sb3{dollar} layer on the surface of the material.; In this study, Al{dollar}sb3{dollar}Ti coating on to the surface of Ti{dollar}sb3{dollar}Al was formed by using laser surface modification technique. The effectiveness of coating was investigated before and after 10 hours cyclic oxidation process.