Abstract: 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.