碳纤维增强碳复合材料表面多层复合涂层中SiC和TiC内层的比较(英文)

COMPARISONS OF SiC AND TiC INNER COATINGS OF THREE LAYERS COMPOSITE COATINGS ON THE SURFACE OF CARBON FIBER REINFORCED CARBON COMPOSITES

采用包埋法制备了碳纤维增强碳(carbon fiber reinforced carb on composites,C/C)复合材料表面多层涂层,包括SiC,TiC内层,SiC,TiC中间层以及SiC+TiC复合外层。利用场发射扫描电镜和X射线衍射对其表面和断面的结构进行研究。结果显示:和TiC内层相比较,SiC内层较厚而且致密,具多孔结构且和C/C复合材料结合紧密;TiC内层较薄且和C/C复合材料结合松散。制备的SiC+TiC复合外层由SiC,TiC和Ti3SiC2组成。

SiC or TiC first layer（inner） coatings as a bond layer and SiC＋TiC composite external（top） coating with a interlayer of SiC or TiC on the surface of carbon fiber reinforced carbon（C/C） composites were prepared by pack cementation technique in an argon atmosphere.The surface topography and the cross-section structure of the coatings were evaluated using a field emission scanning electron microscopy and X-ray diffraction.The elements existed in the coatings were analyzed by energy-dispersive spectroscopy.The results indicate that the TiC inner coating is thin and it adhered with C/C base weakly.Compared with TiC inner coating the SiC inner coating is thicker and compacted,and it is with a porous structure and adhered with C/C base tightly.The thick composite top SiC＋TiC coating is composed of SiC,TiC and Ti3SiC2.