Influence of 2 (wt%) titanium addition on the oxidation resistance of tungsten

The oxidation behaviour of W-2Ti (wt%) alloy has been evaluated in dry air at 600, 700 and 800 degrees C for 100 h and the kinetics compared with those for pure tungsten. Titanium addition exerts a beneficial effect on the oxidation resistance of pure tungsten. The mass gain is almost five times smaller than in the case of commercial tungsten and three times smaller than that of tungsten prepared by powder metallurgy at 600 degrees C. This effect is even higher at 700 and 800 degrees C, where the titanium addition suppresses catastrophic oxidation of pure tungsten. Major influence of titanium regards the suppression of massive microcracking in the scale, avoiding the development of the typical non-protective multilayered scale pattern formed on pure tungsten.

Automated summary

The oxidation resistance of pure tungsten can be improved by adding titanium, which reduces mass gain and suppresses catastrophic oxidation at high temperatures, as well as prevents microcracking in the oxide layer and the formation of non-protective multilayered structures.