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- W4292056448 abstract "A TiO 2 -Nb 2 O 5 -SiO 2 -Al 2 O 3 /NbSi 2 /NbAl 3 multilayer coating was prepared on Nb alloys through halide activated pack cementation (HAPC) and micro-arc oxidation (MAO). The multilayer coatings were composed of a TiO 2 -Nb 2 O 5 -SiO 2 -Al 2 O 3 outer layer, a NbSi 2 middle layer and an Al-rich inner layer. The isothermal oxidation resistance of TiO 2 -Nb 2 O 5 -SiO 2 -Al 2 O 3 /NbSi 2 /NbAl 3 multilayer coated Nb alloy was investigated at 1100 and 1200 °C. Besides, the microstructure evolution and element diffusion of the coatings were studied at 1200 °C. The results showed that after 1200 °C oxidation for 50 h, the weight gain of TiO 2 -Nb 2 O 5 -SiO 2 -Al 2 O 3 /NbSi 2 /NbAl 3 coating sample was 8.54 mg/cm 2 , which was significantly lower than the coating without TiO 2 . An improvement in the high-temperature oxidation resistance of coating with TiO 2 should be ascribed to the formation of continuous and compact oxide scale on the surface. • A TiO 2 modified multilayer coating was formed on the Nb alloy by HAPC/MAO. • The addition of K 2 TiF 6 in the electrolyte increased the compactness of MAO layer. • The TiO 2 -Nb 2 O 5 -SiO 2 -Al 2 O 3 /NbSi 2 /NbAl 3 multilayer coating well protected the Nb alloy. • The good high temperature oxidation resistance is due to the formation of continuous and compact oxide scale." @default.
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- W4292056448 date "2022-12-01" @default.
- W4292056448 modified "2023-10-16" @default.
- W4292056448 title "Microstructure and oxidation resistance of TiO2 modified multilayer coating prepared by HAPC/MAO" @default.
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- W4292056448 doi "https://doi.org/10.1016/j.ijrmhm.2022.105964" @default.
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