Effect of Al2O3 and SiO2 Inert-Fillers on the Microstructural Evolution and High Temperature Oxidation Resistance of B Modified Silicides Coatings Prepared by Pack Cementation Technology

In this study, B modified silicide coatings were prepared on Nb-Si based alloy with Al2O3 or SiO2 inert-filler by pack cementation technology. Both primarily consisted of a (Nb,X)Si2 (Nb,X)B2 + outer layer. After oxidation at 1250 °C for 100 h, the showed good resistance due to formation dense silica. The products coating SiO2, TiO2 and Cr2O3, while that TiO2, HfO2. different may be process these two sample initial stage.