Effect of Infiltration Slurry Containing Silicon on the Microstructure and Properties of SiC Reticulated Porous Ceramics
Silicon carbide reticulated porous ceramics (SiC RPCs) were fabricated by polymer replica method,followed by vacuum infiltration with different alumina slurries.The effects of infiltration slurry containing silicon and sinter temperature on the strut microstructure and mechanical properties of SiC RPCs were investigated.The results showed that the multilayered struts of SiC-RPCs with aluminosilicate as the outer layer and corundum-mullite as the exterior layer were prepared via reaction bonding after infiltrating slurry containing alumina and silicon.Furthermore,the addition of silicon in infiltrated slurry could promote the formation of mullite and reduce the oxidation rate of silicon carbide during sintering.The compressive strength and thermal shock resistance of specimens with alumina slurry containing silicon were greatly improved in comparison with those of alumina slurry infiltration ones.The enhancement was attributed to the reaction-boned triangular area and outer layer as well as residual compressive stress generated in SiC skeleton led to crack deflection.
SiC reticulated porous ceramics three-layer strut residual compressive stress mechanical properties
LIANG Xiong LI Yawei LIU Jun
The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China
国际会议
西安
英文
1-6
2016-09-20（万方平台首次上网日期，不代表论文的发表时间）