Musu Ren

Microstructure analysis of carbon-carbon preform

The microstructure of three kinds of porous carbon–carbon preforms prepared for carbon–carbon/aluminum composites was identified by x-ray diffraction, Raman spectroscopy, and field emission scan electronic microscope. Although manufactured at same processing conditions, including the temperature, type of organic gas, and pressure of pyrolysis, the structure of the pyrolytic carbon (C py ) in three kinds of preforms is different. The morphology of the C py is influence by the topology of the preforms greatly, and the crystal structure of the C py is influenced by the crystal structure of the carbon fiber greatly, on which surface the C py was deposited. The degree of graphitization of the C py had been enhanced and the structure of the C py changed to more anisotropic form when the preforms were annealed at 2773 K.