Abstract
The high temperature oxidation resistance of high specific strength intermetallic compound TiAl was improved by boronizing using chrolide and boride molten salt. The molten salt process has some remarkable characteristics as follows; 1) very simple process, 2) the atomosphere doesn't effect on the chemical reaction in the liquid, 3) specimen is fully dipped into the treatment liquid. TiB2 and Al3Ti layers were produced on the surface of TiAl by this process. The dense and protective Al2O3 phase was observed on the Al3Ti layer. The boronized TiAl was investigated in continuous and cyclic oxidation test at 1173K and 1123K. The mass gain due to oxidation of TiAl decreased by boronizing, where no pealing was observed during oxidation test.
