Effect of temperature on the structure and mechanical properties of SiC-TiB2 composite ceramics by solid-phase spark plasma sintering

作者：Liu, Jiangao; Li, Yang^*; Cheng, Changgui; Li, Wei; Qin, Xufeng

来源：Ceramics International, 2022, 48(16): 23151-23158.

DOI：10.1016/j.ceramint.2022.04.296

• SPS
• SiC-TiB2
• Solid phase sintering
• Sintering temperature
• Mechanical properties

SiC composite ceramics have good mechanical properties. In this study, the effect of temperature on the microstructure and mechanical properties of SiC-TiB2 composite ceramics by solid-phase spark plasma sintering (SPS) was investigated. SiC-TiB2 composite ceramics were prepared by SPS method with graphite powder as sintering additive and kept at 1700 degrees C, 1750 degrees C, 1800 degrees C and 50 MPa for 10min.The experimental results show that the proper TiB2 addition can obviously increase the mechanical properties of SiC-TiB2 composite ceramics. Higher sintering temperature results in the aggregation and growth of second-phase TiB2 grains, which decreases the mechanical properties of SiC-TiB2 composite ceramics. Good mechanical properties were obtained at 1750 degrees C, with a density of 97.3%, Vickers hardness of 26.68 GPa, bending strength of 380 MPa and fracture toughness of 5.16 MPa m(1/2).

• 单位
  y