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 dis-persive spectroscopy (WDS) techniques were used to analyze the structure and oxidation behavior of these coatings. The results re-vealed 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.
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