Synthesis of Ti3SiC2 Phases and Consolidation of MAX/SiC Composites-Microstructure and Mechanical Properties

The article describes the Ti3SiC2 powder synthesis process. The influence of the molar ratio and two forms of carbon on the phase composition of the obtained powders was investigated. The synthesis was carried out using a spark plasma sintering (SPS) furnace. In addition, using the obtained powders, composites reinforced with SiC particles were produced. The obtained results showed no effect of the carbon form and a significant impact of annealing on the purity of the powders after synthesis. The composites were also consolidated using an SPS furnace at two temperatures of 1300 and 1400 degrees C. The tests showed low density and hardness for sinters from 1300 degrees C (maximum 3.97 g/cm(3) and 447 HV5, respectively, for composite reinforced with 10% SiC). These parameters significantly increase for composites sintered at 1400 degrees C (maximum density 4.43 g/cm(3) and hardness 1153 HV5, for Ti3AlC2-10% SiC). In addition, the crack propagation analysis showed mechanisms typical for granular materials and laminates.