Machinability of Ti_3SiC_2 with layered structure synthesized by hot pressing mixture of TiC_x and Si powder

摘要

Nanolaminate Ti_3SiC_2 was synthesized from a mixture of TiC_x (x = 0.61)/Si powder by hot pressing to increase machinability. Ti_3SiC_2 was synthesized at temperatures of 1360°C and 1420°C for 90min under a pressure of 25MPa. The X-ray diffraction results showed that while mainly Ti_3SiC_2 with some unreacted TiC_x were detected in the synthesized samples at 1360 °C, no phases except Ti_3SiC_2 phases remained in the synthesized samples at 1420 °C. The cutting resistance of Ti_3SiC_2 was measured in terms of the principle, feed, and thrust forces and was compared with that of middle-carbon steel, SM45C. The values of the principal force of the synthesized Ti_3SiC_2 were lower than those of SM45C. After machining, the roughness of the Ti_3SiC_2 was lower than those of SM45C;;however, the damage to the tool bit used for the machining of SM45C was less than the damage to those used for the machining of the Ti_3SiC_2.