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首页> 外文期刊>Journal of Materials Engineering and Performance >Strengthening of C/SiC Composites by Electrophoretic Deposition of CNTs on a SiC Coating
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Strengthening of C/SiC Composites by Electrophoretic Deposition of CNTs on a SiC Coating

机译：CNTs在SiC涂层上的电泳沉积加强C / SiC复合材料

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The current study reports the enhancement of mechanical properties of carbon fiber-reinforced silicon carbide ceramic matrix composites (C/SiC CMCs) by the application of a carbon nanotube/silicon carbide (CNT/SiC) coating. CNTs were deposited on the surfaces of C/SiC composites using electrophoretic deposition (EPD), after which infiltration by SiC was achieved through a chemical vapor infiltration process. An EPD duration of 5min was associated with a 40% increase in the ultimate flexural strength relative to that of composites with a pure SiC coating. The observed enhancement was rationalized by the microstructural observations of SiC infiltration into the porous CNT morphology and the subsequent formation of CNT/SiC layers on the surfaces of the composites and by the inherent toughness of the SiC whiskers. The flexural strength decreased with EPD durations greater than 5min due to the formation of thick CNT meshes, which decreased the open porosity and thereby obstructed further SiC infiltration. This is a viable methodology for the improvement of mechanical properties of CMCs by the introduction of a ceramic coating containing CNT.
机译：目前的研究通过施加碳纳米管/碳化硅（CNT / SiC）涂层来提高碳纤维增强碳化硅陶瓷基质复合材料（C / SiC CMC）的力学性能。使用电泳沉积（EPD）沉积CNT在C / SiC复合材料的表面上，之后通过化学蒸汽渗透过程通过SiC渗透。对于具有纯SiC涂层的复合材料的极限弯曲强度的40％增加，持续5分钟的EPD持续时间与具有纯SiC涂层的复合材料的增加有关。观察到的增强通过SiC渗透到多孔CNT形态的微观结构观察和随后在复合材料表面上形成的CNT / SiC层以及SiC晶须的固有韧性来合理化。由于形成厚的CNT网格，抗弯曲强度随着厚的CNT网眼的形成而大于5分钟，这降低了开孔率，从而阻碍了进一步的SiC渗透。这是通过引入含有CNT的陶瓷涂层来改善CMC的机械性能的可行方法。

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