Thermodynamic and phase analysis of SiC-nano/microB 4 C-C composites produced by pressureless sintering method

In this research, thermodynamic and phase analysis of SiC-Nano/microB 4 C composites with different weight percentages of secondary phase including 0, 0.5, 1, and 2 wt% -nano /microB 4 C made by pressureless sintering method have been investigated. To this end, 0 and 1 wt% phenolic resin were added to the samples separately as a carbon source (both as a binder and as a carbon additive), respectively. The resulting compounds were milled by a planetary ball mill for 3 h at a speed of 200 rpm. The initial pressing of the samples was performed at 50 MPa and the samples were subjected to pyrolysis at 600 °C. They were then sintered at 2150 °C for 2 h under an argon atmosphere. The results showed that the composite contained SiC-0.5 wt% -nanoB 4 C with the main peak intensity (2θ = 35.58) in phasic analysis using XRD pattern of more than 15,000 units and FWHM equal to 0.0036 which shows that the structure is smaller than the additive mode (FWHM = 0.2210) SiC-0.5 wt% -microB4C. Also, the results of phase analysis using the XRD model show that the use of NanoB 4 C increases the peak intensity in the phase analysis graph compared to the MicroB 4 C additive mode. In addition, increasing the wt% -nanoB 4 C increases the amount of graphitization.