通过加热TiB2及 ZrB2粉末与等静压炭块至共熔点以上的方法制备出新型炭/陶复合材料涂层 TIB、ZRB-1与ZRB-2。结果表明,所制自生复合材料涂层的表层与内部结构明显不同,表层由B掺杂的高度有序石墨构成,内部由TiB2-C或ZrB2-ZrC-C合金组成。 TIB、ZRB-1与ZRB-2涂层中石墨的d002值分别为0.3359、0.3360与0.3354 nm,接近或等于单晶石墨的d002值(0.3354 nm),表明高度有序石墨结构的形成。3种涂层内部石墨的拉曼光谱中D峰、D'峰明显,2D峰强度低及G峰向高波数偏移,这些特征是由石墨碳网格结构中B掺杂所致。此外,ZrB2粒径小有利于涂层表层应力的释放。
74 μm TiB2 , and 74 μm and 1 μm ZrB2 powders were heated with isostatically pressed carbon blocks at 2 550 ℃, which is above the eutectic temperature of TiB2-C and ZrB2-C, to form eutectic coatings, which are named TIB, ZRB-1 and ZRB-2, respectively. Results showed that the surface and the inner part of the coatings were different. The surface of the coatings was composed of B-doped highly ordered graphite, and the inner part was composed of TiB2-C or ZrB2-C alloy. The d002 values of graphite in samples TIB, ZRB-1 and ZRB-2 were 0. 335 9, 0. 336 0 and 0. 335 4 nm, respectively, which are almost the same as that of single crystal graphite (0. 335 4 nm), indicating the formation of highly ordered graphite. The features of the Raman spectra of these three coatings such as the appearance of D and D' bands, low intensity 2D bands and the shift of G bands to higher wave numbers are ascribed to B-doping in the graphene layers of the graphite. The small particle size of the ZrB2 powder favored the re-laxation of the stress formed inside the surface of the coatings.
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