High temperature oxidation of titanium

1.1 Oxidation of pure titanium

When the temperature is below 500℃, the performance of pure titanium is relatively stable. However, as the temperature continues to increase, oxygen continues to penetrate into the titanium lattice and react with the titanium matrix, forming a large amount of rutile structure on the surface of the titanium material. TiO2 oxide. The rutile TiO2 structure is loose and easy to crack and fall off, causing the titanium material to re-expose the fresh surface, that is, the high temperature oxidation behavior of the pure titanium material can be regarded as the repeated layered peeling of the surface oxide film.

1.2 The influence of alloying elements on the oxidation performance of titanium alloys

The addition of Al, Cr, Si and other alloying elements will not only change the mechanical properties of the titanium alloy, but also affect its resistance to high temperature oxidation. Among them, when the content of Al element in the titanium reaches a certain concentration, the oxyphilic Al element will preferentially react with oxygen, forming a continuous, dense and stable Al2O3 oxide film on the surface of the titanium base, which in turn has a better effect on the base material. Good resistance to high temperature oxidation. On the one hand, the existence of Cr element can promote the formation of Al2O3 oxide film. On the other hand, the miscible zone containing Cr phase can form a certain diffusion layer. When the titanium base is covered with Al protective coating, the diffusion layer can effectively inhibit Ti, Al The inter-diffusion of the elements prolongs the service life of the coating.
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