大尺寸各向同性热解炭材料的制备与表征

采用一种新的旋转基体稳态流化床沉积装置制备大尺寸的各向同性热解炭材料。利用金相显微镜、扫描电镜、透射电镜和XRD对各向同性热解炭材料的微观结构进行了表征，并对其力学性能进行了测试。结果表明，改进后的旋转基体稳态流化床沉积工艺能够制备出大尺寸的各向同性热解炭材料。材料的结构均匀，气孔较少，主要由球形颗粒状碳结构组成，构成这种球形颗粒状碳结构的是乱层结构的石墨片层堆积体。各向同性热解炭与传统炭材料相比具有较高的杨氏模量、硬度和强度。

Fabrication and characterization of large isotropic pyrolytic carbons

Large isotropic pyrolytic carbon rings were fabricated by a steady fluidized bed deposition apparatus with a rotating substrate.The microstructure of the isotropic pyrolytic carbons obtained was investigated by polarized light microscopy,SEM,TEM and XRD.Their mechanical properties were also studied.Observations using polarized light microscopy and SEM show that the microstructure is homogeneous and there is a small amount of closed porosity inside.TEM observations show that this material is mainly made up of fine turbostratic carbon structures.Mechanical tests show that the(Young's) modulus,microhardness,flexural strength and compressive strength of the carbons are higher than those of traditional carbon materials.