炭/炭复合材料石墨化度的XRD表征方法

MEASUREMENT OF GRAPHITIZATION DEGREE OF CARBON-CARBON COMPOSITES BY X-RAY DIFFRACTION

研究了X射线衍射(XRD)法测定炭/炭复合材料石墨化度的原理和方法.实验结果表明:由于试样中含有不同石墨化度的组分,致使碳石墨的衍射线呈现明显的不对称,用不同方法所确定的峰位得到的石墨化度值差异很大,比较而言,通过拟合定位更接近材料真实情况,考虑了各组元的信息;另外,对C(002)峰进行多重峰分离处理,以各子峰的相对含量作权重,可以很明显地看出试样中不同石墨化度成分所占的比例,最终得到一个较为合理的石墨化度值.

The principle and measurement method for graphitization degree of carbon-car- bon（C/C）composites by X-ray diffraction were investigated. The results show that there exist different graphitized components in C/C composite, and so the profiles of diffraction pattern are asymmetrical. Graphitization degree has more obvious differences among different methods of search peaks,and the common characterizes of the graphitization degree are only evaluated by the best graphitized component of all C/C components. Considering hard graphitized component, it is more suitable to fit profile of peaks. In addition, through multiple-peak separating, the separated peaks could be used to calculate graphitization degree directly. The integral intensity obtained from every single-peak could be calculated according to the relate content of every component, and it is very reasonable to investigate the true graphitization degree of C/C composite.