Abstract SiC ceramic matrix composites were prepared by 3D direct ink and phrolysis writing using nano Ti and NiO particles as active fillers, polycarbosilane (PCS) as SiC ceramic precursor, n-hexane as solvent to prepare slurries. The rheological properties of the slurries were investigated. The phase and morphology of the ceramic matrix composites were characterized. The effects of active fillers (nano Ti particles and nano NiO particles) on the phase and morphology of 3D-SiC ceramic matrix composites were studied. The results show that the viscosity of the slurry is proportional to the mass fraction of PCS, and it has shear thinning phenomenon. The slurry with 75% PCS has stable printing performance. The nano Ti powder can effectively reduce the mass loss rate and linear shrinkage rate during pyrolysis at 1 450 ℃, and the mass loss and linear shrinkage decrease from 18.29% and 24.38% to 14.05% and 12.13% respectively, the ceramics contains TiC and SiC phases. Compared with Ti powder, NiO can be used as a surface modification catalyst for SiC, and SiC whisker clusters can be grown in situ on the surface of SiC ceramics through the gas liquid solid (V-L-S) growth mechanism.
ZHAO Lianzhong,LI Zhouyao,XIONG Huiwen, et al. Effect of active fillers on direct ink writing 3D SiC on polycarbosilane suspension[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(2): 166-173.
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2021, Vol. 26 
