Abstract：Dense monolithic (5RE0.2)2SixO2x+3/SiOC (RE=Yb, Ho, Er, Lu, Tb, Tm, Gd, x=1 or 2) ceramic nanocomposites were fabricated from rare-earth acetates and polysiloxane via the polymer-derived ceramics route coupled with spark plasma sintering. The resistance of the ceramic nanocomposites to CaO-MgO-Al2O3-SiO2 (CMAS) corrosion at 1 300-1 500 ℃, along with the underlying corrosion mechanisms, was investigated using X-ray diffractometer, scanning electron microscope, and transmission electron microscope. The results indicate that the ceramic nanocomposites comprise a SiOC matrix with a uniformly distributed high-entropy rare-earth silicate phase (5RE0.2)2SixO2x+3. The ceramic nanocomposites exhibit low mass loss and a thin corrosion layer at 1 300- 1 500 ℃, demonstrating excellent CMAS corrosion resistance. This superior performance is primarily attributed to the formation of a Ca3(5RE)2(Si3O9)2 cyclosilicate layer, resulting from the reaction between the (5RE0.2)2SixO2x+3phase and the molten CMAS, which effectively inhibit further infiltration. Furthermore, the specific rare-earth element in the (5RE0.2)2SixO2x+3 phase plays a crucial role in the CMAS corrosion resistance of the ceramic nanocomposites. Gd-containing ceramic nanocomposites exhibit optimal long-term resistance at 1 300 ℃, with a mass loss of only 3.6% after 20 h of corrosion. In contrast, Tb-containing ceramic nanocomposites demonstrate superior performance at a higher temperature, resulting in a remarkably thin corrosion layer of merely 20 μm after corrosion at 1 500 ℃ for 5 h.
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2026, Vol. 31 
