等静压石墨表面SiC涂层的制备与性能表征

Preparation and Characterization of SiC Coating on Isostatic Pressing Formed Graphite Surface

为提高炭素材料的抗氧化性能,采用喷涂法在等静压石墨基体上制备了SiC涂层,研究了涂层浆料中硅、碳比例对SiC涂层物相组成、微观形貌以及抗氧化性能的影响。通过XRD、SEM和氧化实验分析表明:喷涂法制备的SiC涂层主要由3C-SiC、C和少量Si组成,且随着反应浆料中碳粉比例的升高,涂层与基体之间的渗入比例逐渐降低。当硅、碳比为1∶0.3时,基体表面可生成较为充足的SiC产物,且结合性较好,在1500℃下氧化120min的氧化失重率为7.5%。

In order to improve the oxidation resistance of carbon materials,SiC coating was prepared on isostatic pressing formed graphite matrix by spraying method.The effects of the ratio of silicon to carbon in coating slurry on the phase composition,microstructure and oxidation resistance of SiC coating were studied.The results of XRD,SEM and oxidation experiments show that the SiC coating prepared by spraying method is mainly composed of 3 C-SiC,C and a small amount of Si,and with the increase of the proportion of carbon powder in the reaction slurry,the infiltration ratio between the coating and matrix decreases gradually.When the ratio of silicon to carbon is 1∶0.3,sufficient SiC products can be formed on the substrate surface and the binding property is better.The oxidation weight loss rate of oxidation at 1500℃for 120 min is 7.5%.