This paper presents experimental results obtained in developing ceramic composites based on SiC and Si₃N₄, sintered by plasma sintering method (Spark Plasma Sintering (SPS). Sintering process took place in a controlled atmosphere of nitrogen (N₂), at a temperature of 1850⁰C. The experiments aimed to obtain ceramic plates based on SiC and Si₃N₄ doped with different sintering additives (Al₂O₃, Y₂O₃) and their characterization.

Physical-mechanical parameters were determined (bulk density, apparent porosity, water absorption, tensile strength and hardness). Mineralogical composition analysis was also carried out by X-ray diffraction for both composites. The results reflect the benefits of obtaining by plasma sintering method, because of the superior characteristics results comparing with those materials obtained by the classical method.