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In this study, the microstructural and mechanical properties of three different mullite matrix composites were investigated. Accordingly, Mullite-TiN-CNT, Mullite-TiN-TiB₂-CNT and Mullite-TiN-TiB₂-ZrB₂-CNT composites with 10 wt % of each TiN, TiB₂ and ZrB₂ reinforcement particles as well as 1 wt % CNT were prepared by the spark plasma sintering (SPS) technique. The sintering processes were conducted at 1350 °C for 5 min with a mean heating rate of 60 °C/min. The relative densities of the composites achieved were higher than 97% of theoretical density. The results of mechanical properties of the fabricated composites showed that Mul-TiN-TiB₂-ZrB₂-CNT composites obtained the highest hardness and fracture toughness values. XRD results confirmed the presence of mullite, TiN, TiB₂ and ZrB₂ phases without any additional reactions between reinforcement and matrix phases. Microstructural studies …