论文部分内容阅读
基于两步氧化插层先驱体法制备了不同膨胀体积的膨胀石墨,分析了先驱体、膨胀石墨的微观结构和微观形貌;利用静态测试系统测试了膨胀石墨对1.064μm激光的消光行为,据此计算了其对1.064μm激光的质量消光系数,得到了该系数与膨胀体积的依赖关系,并从消光机理进行了原因分析。结果表明:通过控制和优化先驱体合成条件,可以制得膨胀体积高达600mL·g-1的膨胀石墨;两步插层导致先驱体的层间距(d002)明显大于天然石墨,当其d002从0.359 0nm增至0.371 1nm时,所得膨胀石墨的膨胀体积从267mL·g-1增至600mL·g-1;膨胀石墨平均质量消光系数与膨胀体积呈近似线性关系,当膨胀体积由233mL·g-1增至600mL·g-1时,该系数从0.20m2·g-1升至0.48m2·g-1;膨胀石墨对1.064μm激光呈非选择性散射,膨胀体积大,导致几何面积大,对1.064μm激光的散射能力增强;同时,膨胀石墨中出现了更深的孔隙或孔腔,可作为等效黑体增强对入射激光的吸收.
Based on the two-step oxidative intercalation method, expanded graphite with different volume of expansion was prepared, and the microstructure and morphology of precursor and expanded graphite were analyzed. The extinction behavior of 1.064μm laser with expanded graphite was tested by static test system. The mass extinction coefficient of the 1.064μm laser was calculated. The dependence of the coefficient on the expansion volume was obtained. The reason was analyzed from the extinction mechanism. The results show that the expanded graphite with an expansion volume of 600mL · g-1 can be obtained by controlling and optimizing the synthesis conditions of the precursors. The interlayer spacing (d002) of the precursors is significantly larger than that of natural graphite with two steps of intercalation. The swelling volume of expanded graphite increased from 267mL · g-1 to 600mL · g-1 when 0nm was increased to 0.371 1nm. The average mass extinction coefficient of expanded graphite showed an approximate linear relationship with the swelling volume. When the swelling volume was increased from 233mL · g-1 The coefficient increased from 0.20m2 · g-1 to 0.48m2 · g-1 when the volume was increased to 600mL · g-1. Expanded graphite showed non-selective scattering to 1.064μm laser with large bulging volume, μm laser light scattering ability; the same time, the expansion of graphite appeared deeper pores or cavity, can be used as an equivalent blackbody to enhance the absorption of the incident laser.