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Reaction-bonded silicon carbide ( RBSC) was prepared by ceramic injection molding ( CIM) technique with feedstocks containing silicon carbide (SiC), a wax-based organic system and different amounts of carbon black. As a critical effect of the reaction sintering process, carbon was introduced from the carbon black and the decomposition product of the organic polymers, respectively. This study described the influence of carbon content on the mixing and injection process firstly and then emphasized the debinding process since it played a large role in the process of the pyrolysis of organic. Results indicated that the preferable thermal debinding was performed in N2 and the optimal performance was obtained for RBSC with 7 wt.% of carbon black, with the density of 2.98 g/cm3, apparent porosity of 0.24%, bending strength of 301.59 MPa and fracture toughness of 4.18 MPa·m1/2. [ABSTRACT FROM AUTHOR]

SiC ceramics with graphene additives have been fabricated by a pressureless-sintered method. The effects of graphene contents on the densification, thermal conductivity, electrical conductivity, phase compositions, and microstructure evolutions of the SiC ceramics were investigated in detail. As the graphene content increased from 0 to 5.0 wt%, the relative density of the SiC samples monotonically decreased, the electrical conductivity monotonically increased, whereas the thermal conductivity initially increased and then decreased. The highest thermal conductivity of 145.14 W/(m K) was obtained for SiC sample with 2.0 wt% graphene sintered at 2130 °C for 1 h in Ar. [ABSTRACT FROM AUTHOR]