SiOC modulates the anisotropy of and reinforcing SiC-based ceramics in mechanical properties (IMAGE)
Caption
Incorporating a high content of methyl-phenyl-polysiloxane (PSO) solution (75% by weight) enabled low-temperature pyrolysis of SiC/SiO2/PSO ceramics. The SiC/SiO2/PSO ceramic lattices after pyrolysis achieved a specific strength as high as (1.03 × 105) N·m·kg−1 and density of 1.75 g·cm−3, outperforming similar SiC-based lattices structures of similar porosities. The bending strength of (95.49 ± 8.79) MPa was comparable to that of ceramics sintered at 1 400 ℃ or higher. Notably, the addition of the silicon carbide oxide (SiOC) phase reduced anisotropy, lowering the transverse and longitudinal compression strength ratios from 1.87 to 1.08, and improving mechanical properties by 79%. This improvement is attributed to SiOC shrinkage, promoting a uniform distribution of sintered components, resulting in a more robust and balanced material structure.
Credit
By Piao Qu, Guozhen Liang, M Irfan Hussain, Muhammad Hanif, Muhammad Hamza, Kaibin Huang, Yan Lou* and Zhangwei Chen*
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License
CC BY-NC