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采用电磁场辅助CVD法,在650～750°C的温度下制备出具有中空结构的倒锥状热解炭。此类倒锥状热解炭生长在C/C复合材料中热解炭的表面。采用高分辨率透射电镜对倒锥状热解炭的内部结构进行精细表征。结果表明,倒锥状热解炭的内部织构呈现出从根部杂乱的缠绕织构直接到其紧邻茎部有序的高织构的变化趋势,而从其茎部至锥尾部区域,炭微晶结构有序化程度逐渐降低。倒锥状热解炭的形成机理可推测为是一种在强电磁场作用下的极化诱导效应和击穿放电作用下的颗粒填充效应的综合作用。
The use of electromagnetic field-assisted CVD method, at a temperature of 650 ~ 750 ° C with a hollow structure inverted pyramid pyrolysis charcoal. Such inverted pyramidal pyrocarbons grow on the surface of pyrocarbons in C / C composites. High-resolution transmission electron microscopy was used to characterize the internal structure of the pyrolytic carbon. The results show that the inverted pyramidal pyrolysis charcoal internal structure presents from the root of the messy winding texture directly to the adjacent orderly high-textured trend, and from its stem to cone tail region, carbon micro The degree of ordering of the crystal structure is gradually reduced. The formation mechanism of inverted conical pyrolytic carbon can be presumed to be a combination of the polarization-induced effect under the action of a strong electromagnetic field and the particle-filling effect by the breakdown discharge.