摘要
通过加热TiB_2及ZrB_2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TiB_2-C或ZrB_2-ZrC-C合金组成。TIB、ZRB-1与ZRB-2涂层中石墨的d_(002)值分别为0.335 9、0.336 0与0.335 4 nm,接近或等于单晶石墨的d_(002)值(0.335 4 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,ZrB_2粒径小有利于涂层表层应力的释放。
74 μm TiB_2,and 74 μm and 1 μm ZrB_2 pow ders were heated with isostatically pressed carbon blocks at 2 550℃,which is above the eutectic temperature of TiB_2-C and ZrB_2-C,to form eutectic coatings,which are named TIB,ZRB-1 and ZRB-2,respectively. Results show ed 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 TiB_2-C or ZrB_2-C alloy. The d_（002） values of graphite in samples TIB,ZRB-1 and ZRB-2 w ere 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 ZrB_2 pow der favored the relaxation of the stress formed inside the surface of the coatings.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2016年第2期188-198,共11页
New Carbon Materials
