Abstract
In this work, Ti3SiC2/Al2O3 composites with various volume contents of Ti3SiC2 were fabricated under different orthogonal processes by vacuum hot pressing sintering. optimized comprehensive mechanical properties and relative density (＞97%) were obtained (the microhardness, flexural strength and fracture toughness reached the values of 16.25 GPa, 536.31 MPa and 9.3 MPa m1/2, respectively.) when the Al2O3 (60.0 vol %) and Ti3SiC2 (40.0 vol %) were sintered at 1500 °C for 0.5 h at 30 MPa, which basically correspond to the best level of after orthogonal calculation. The orientational growth behavior of Ti3SiC2 was further confirmed by EBSD, and temperature was found to play a prominent role in the growth of Ti3SiC2 to some extents, fewer columnar Ti3SiC2 grains were observed at lower temperature and weak decomposition of Ti3SiC2 was observed at 1500 °C. Meanwhile, high volume Ti3SiC2 was beneficial to the improvement of mechanical properties for the intrinsical layered structure.
Published Version
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