Si-modified aluminide coatings deposited on Ti46Al7Nb alloy by slurry method

Formation kinetics of multi-layered interfacial zone between γ-TiAl and glass–ceramic coatings via interfacial reactions at 1000°C

“…Table 1 shows the all possible chemical reactions (numbered as reactions (1)- (15)) and the corresponding standard Gibbs free energy change DG h of those reactions at 1000°C. The value of DG h was calculated according to a thermodynamic handbook [43].…”

“…However, cracks are always generated in the coating [7,8,11], due to the thermal expansion mismatch between TiAl 2 or TiAl 3 and c-TiAl. Much work has been devoted to incorporating ternary element into the aluminide coatings in order to improve the overall performance and is still under investigation [15][16][17][18][19][20][21][22]. The other types of coatings which possess the Al 2 O 3 -forming abilities are the MCrAlY (M = Fe, Co, Ni or their combination) overlay coatings [23].…”

Microstructure evolution and oxidation resistance of silicon-aluminizing coating on γ-TiAl alloy

“…As mentioned previously, Si has good affinity with Ti. They can form titanium silicides of the types TiSi 2 , Ti 5 Si 3 , Ti 5 Si 4 and TiSi, that exhibit high oxidation resistance [40]. In this paper, Si mainly existed in the form of Si-rich precipitates and Ti 5 Si 3 phase.…”

Improvement of oxidation resistance of Ti–47Al–2W–0.5Si alloy modified by aluminizing method

“…Resistance to oxidation is also improved by CaTiO 3 , SrTiO 3 , BaTiO 3 , SrTiO 3 and AlTiO 5 coatings [4,[8][9][10][11][12][13][14][15]. The most often methods used for production of coatings include: pack cementation method, out-of-pack method, slurry method as well as CVD (Chemical Vapor Deposition) and arc-PVD method [4,[11][12][13][14][15][16][17][18][19][20][21][22].…”