[T5] Field Assisted Sintering Technologies

[16B-T5-06] Fabrication and Mechanical Properties of Textured Ti₃SiC₂ by Slip Casting in a Strong Magnetic Field Followed by Spark Plasma Sintering

Y. Sakka¹, K. Sato¹, H. Hirano^1,2, T. Ishigaki², T. S. Suzuki¹, *K. Morita¹ (1.National Institute for Materials Science, Japan, 2.Hosei University, Japan)

Keywords:MAX phase ceramics, colloidal processing, textured ceramics, mechanical property, SPS

Ti3SiC2 with a nacre-like microstructure was fabricated by slip casting in a strong magnetic field followed by spark plasma sintering (SPS). To determine the effect of the grain size and texture on the mechanical properties, two textured and non-textured Ti3SiC2 ceramics with different grain sizes were prepared by the different initial particle size and SPS sintering temperature. A powder with relatively large plate-like Ti3SiC2 particles was fabricated by the templated-grain growth method. Increasing the grain size increased the fracture toughness of the textured Ti3SiC2 ceramics but decreased the three-point bending strength. The three-point bending strength and fracture toughness of the textured Ti3SiC2 with the large grain size were 812 MPa and 7.3 MPa・m1/2, and those with the small grain size were 1045 MPa and 5.6 MPa・m1/2, respectively. Furthermore, catastrophic failure of the textured Ti3SiC2 ceramics after the fracture toughness test was prevented, similarly to in fiber-reinforced ceramics.