期刊
CORROSION SCIENCE
卷 206, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110538
关键词
Ablation resistance; Long -term and cyclic ablation; Ultra-high temperature ceramic matrix; composites; Rare earth
资金
- Key Research Program of Frontier Sciences, CAS, China [QYZDY-SSW-JSC031]
- State Key Laboratory of Advanced Technology
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China [2021- KF-5]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, China [KF2116]
The research shows that the La2O3 modification affects the long-term and cyclic ablation behavior of Cf/ZrB2-SiC composites. The formation of a ZrO2-La2O3-SiO2 liquid phase layer at 2500 degrees C reduces mass recession rates, but with poor structural stability and weakening of ZrO2 pinning effect by La2O3. This leads to increased linear recession rates with higher La2O3 content during cyclic ablation.
In this work, long-term and cyclic ablation behavior of the La2O3 modified Cf/ZrB2-SiC composites were studied by air plasma torch at 2500 degrees C. It is indicated that a micron-sized ZrO2-La2O3-SiO2 liquid phase layer forms on the ablation surface at 2500 degrees C, which reduces the evaporation of SiO2 and decreases the mass recession rates of the composites. However, the ZrO2-La2O3-SiO2 liquid phase layer exhibits poor structure stability. In addition, the La2O3 weakens the pinning effect of bulk ZrO2. Consequently, the oxide layer with low viscosity tends to sputter out due to the mechanical scouring by plasma flame. Therefore, the linear recession rates of the com-posites are increased during cyclic ablation with the increase of the La2O3 content.
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