聚合物转化(5RE0.2)2SixO2x+3/SiOC纳米复相陶瓷在1 300~1 500 ℃的耐CMAS腐蚀性能

doi:10.19976/j.cnki.43-1448/TF.2025048

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Abstract Dense monolithic (5RE_0.2)₂Si_xO₂_x₊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 (5RE_0.2)₂Si_xO₂_x₊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 (5RE_0.2)₂Si_xO₂_x₊₃phase and the molten CMAS, which effectively inhibit further infiltration. Furthermore, the specific rare-earth element in the (5RE_0.2)₂Si_xO₂_x₊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.

Key words： polymer-derived ceramic ceramic nanocomposite high entropy ceramic rare earth silicate CMAS corrosion

Received: 20 May 2025 Published: 10 March 2026

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	HUANG Xu
	WEN Qingbo
	JIANG Yangyang
	JIANG Tao
	ZOU Hongfei
	XIONG Xiang

Cite this article:

HUANG Xu,WEN Qingbo,JIANG Yangyang, et al. CMAS corrosion resistance of polymer-derived (5RE_0.2)₂Si_xO₂_x₊₃/SiOC ceramic nanocomposites at 1 300-1 500 ℃[J]. Materials Science and Engineering of Powder Metallurgy, 2026, 31(1): 71-85.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2025048 OR http://pmbjb.csu.edu.cn/EN/Y2026/V31/I1/71

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