Evaluation of the Microstructure of 3D-Cf/SiC Composites Fabricated by Precursor Infiltration and Pyrolysis
The microstructure and its evolution of 3D-Cf/SiC composites derived from organic precursor are studied by using scanning electronic microscopy, mercury intrusion porosimetry, isothermal N2 sorption and bubble point method, etc. As the results shown, MIP is preferable to N2 sorption for the characterization of pore size distribution (PSD) because of its wider effective probing ranges. The typical porosity of fabricated 3D-Cf/SiC composites is 10-15vol.%, and all the pores distribute in a quite wide size ranging from some dozens of nanometers to hundreds of microns and can be divided into three groups, according to their sizes, contents and locations: the inter-bundle macro-pores/paths, the intra-bundle pores and the micro-pores/cracks around the interfaces or in the matrixes. The macro-pores/paths constitute a porous network, which is partially open throughout the composites.
Wei Pan and Jianghong Gong
W. Li and Z. H. Chen, "Evaluation of the Microstructure of 3D-Cf/SiC Composites Fabricated by Precursor Infiltration and Pyrolysis", Key Engineering Materials, Vols. 368-372, pp. 1034-1037, 2008