The SiCnf/SiC composites were fabricated by combination of direct ink writing and reactive melt infiltration.By designing the component of the raw materials,the SiC particles,carbon black,SiCnf,sodium alginate and polyethylene glyclo were used as raw materials to prepare the ceramic slurry with appropriate rheological properties that could meet the requirements of direct ink writing technology.After direct ink writing,drying,debinding,phenolic resin impregnation and pyrolysis,and finally densification and sintering by reactive melt infiltration,SiCnf/SiC composite ceramics were obtained.Effects of additive content of the carbon black and the SiCnf on microstructure evolution,phase composition and mechanical properties of SiC ceramic materials were analyzed in detail.The results showed that the flexural strength of SiC ceramics reached a maximum of 236.3 MPa when the content of carbon black was 2 vol.％.And,the flexural strength and fracture toughness of SiCnf/SiC composites reached the maximum values of 279.8 MPa and 4.26 MPa·ml/2 respectively,when the content of SiCnf was 4 vol.％.Compared to the samples without the SiCnf,the flexural strength and fracture toughness were increased by 18.5％and 22.4％respectively.This method exhibited great application prospects in manufacturing ceramic components with complex structures.
direct ink writingsic ceramic matrix compositessic nanofiberscarbon contentreactive melt infiltration
万方数据
维普
