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首页> 外文期刊>Applied Surface Science >Oxidation Behavior And Kinetics Of Sic/alumina-borosilicate Coating For Carbon-carbon Composites
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Oxidation Behavior And Kinetics Of Sic/alumina-borosilicate Coating For Carbon-carbon Composites

机译：碳-碳复合材料的Sic /氧化铝-硼硅酸盐涂层的氧化行为和动力学

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摘要

A SiC/alumina-borosilicate double-layer coating was prepared by a two-step slurry technique for the protection of carbon-carbon composites from oxidation. SEM, XRD and EDX analysis showed that the inner layer coating obtained from the first step consisted of β-SiC, Si and SiO_2. The outer layer consisted of B_4C, Al, amorphous SiO_2 and quartz. The oxidation behavior and kinetics of the SiC/alumina-borosilicate coating were investigated. It was found that the as-prepared coating could effectively protect carbon-carbon composites from oxidation at 1300 ℃ for 100h. The isothermally oxidation kinetics could be described by Microflaws Model and Diffusion Model. During short-time oxidation, the overall oxidation kinetics was determined by the transport processes through microflaws, which resulted in a linear growth law. While during oxidation of longer time, the weight loss rate was controlled by the diffusion processes in the coating with growing oxide layer, which led to a parabolic growth law.
机译：通过两步浆料技术制备了SiC /氧化铝-硼硅酸盐双层涂层，以保护碳-碳复合材料免受氧化。 SEM，XRD和EDX分析表明，第一步得到的内层涂层由β-SiC，Si和SiO_2组成。外层由B_4C，Al，无定形SiO_2和石英组成。研究了SiC /氧化铝-硼硅酸盐涂层的氧化行为和动力学。结果表明，所制备的涂层可以有效地保护碳-碳复合材料在1300℃下100h的氧化。等温氧化动力学可以用Microflaws模型和扩散模型来描述。在短时氧化过程中，总体氧化动力学由微裂纹的传输过程决定，这导致了线性增长定律。在较长时间的氧化过程中，失重率是由具有增长的氧化层的涂层中的扩散过程控制的，这导致了抛物线的生长规律。

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