Effects of Y2O3/Y on Si-B co-deposition coating prepared through HAPC method on pure molybdenum

Abstract

In order to clarify the effects of reactive element Y on the properties of Si-B co-deposition coating on Mo substrate, the Si-B-Y2O3 and Si-B-Y co-deposition coatings were prepared at 1300 °C for 5 h by using the pack mixtures 16Si-4B-xY2O3/Y-4NaF-(76-x)Al2O3 (wt.%, x=0, 0.5, 1, 2, 4, 8). X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and wavelength dispersive spectroscopy (WDS) techniques were used to analyze the structure and oxidation behavior of these coatings. The results revealed that the Si-B-Y2O3 and Si-B-Y co-deposition coatings had the same structure with that of the Si-B co-deposition coating. However, Y was incorporated into these coatings and the thicknesses of these coatings were thicker than that of the Si-B co-deposition coating. In addition, the Si-B-Y co-deposition coating demonstrated better cyclic oxidation resistance than the Si-B co-deposition coating at 1100 °C. The modifying mechanism of Y on the Si-B co-deposition coating was discussed.