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众所周知,石墨的晶体结构为六方,在基面(0001)上的原子以强键共价键结合,而两个基面间的原子结合力则为脆弱的Van der Waals力,因此,单晶石墨的力学性能是强各向异性的。在Fe-C自生复合材料中,几何形态上定向且平行排列的石墨片的强度与其晶体取向有关。本文采用单向凝固法,使石墨片的宏观形态沿纵向平行排列,即制成自生复合材料,然后,用扫描电镜和X射线衍射仪具体测定石墨片的晶体取向,为改善力学性能提供依据.
It is well known that the crystal structure of graphite is hexagonal. The atoms on the base (0001) are strongly covalently bonded, and the atomic binding force between the two base surfaces is a weak Van der Waals force. Therefore, single crystal graphite The mechanical properties are strongly anisotropic. In Fe-C autogenous composites, the strength of the graphene sheets geometrically oriented and arranged in parallel is related to their crystal orientation. In this paper, the unidirectional solidification method was used to make the macroscopic morphology of graphite sheets arranged in parallel along the longitudinal direction, which was made into a self-forming composite material. Then the crystal orientation of the graphite sheet was determined by scanning electron microscopy and X-ray diffractometer to provide the basis for improving the mechanical properties.