Influence of Fabricated Process on Mechanical Properties of Porous SiC-Particle/Si3N4 Composites
In this paper, the mechanical properties of porous Si3N4/SiC composite prepared by different forming method (uniaxial pressing and gel-casting) were compared. Using gelcasting and two steps sintering technology, the porous SiC-particle/Si3N4 composites with a high strength, uniform structure and a relative high porosity were obtained by adding a little amount of nano carbon in slurry. The flexural strength of optimized material reaches to 100MPa and its porosity is more than 60%. But using uniaxial pressing and sintering at N2 atmosphere, because the green bodies have the high density, and the density distribution of a powder compact was not uniform, the flexural strength is not high, and at the same time, the microstructure is not uniform also.
Wei Pan and Jianghong Gong
H. J. Wang et al., "Influence of Fabricated Process on Mechanical Properties of Porous SiC-Particle/Si3N4 Composites", Key Engineering Materials, Vols. 336-338, pp. 1320-1323, 2007