High‐strength TiB <sub>2</sub> ‐B <sub>4</sub> C composite ceramics sintered by spark plasma sintering
Daimeng Chen, Kuibao Zhang, Jianjun Zeng, Haiyan Guo, Bo Li
Abstract
Abstract Spark plasma sintering (SPS) is an advanced sintering technique because of its fast sintering speed and short dwelling time. In this study, TiB 2 , Y 2 O 3 , Al 2 O 3 , and different contents of B 4 C were used as the raw materials to synthesize TiB 2 ‐B 4 C composites ceramics at 1850°C under a uniaxial loading of 48 MPa for 10 min via SPS in vacuum. The influence of different B 4 C content on the microstructure and mechanical properties of TiB 2 ‐B 4 C composites ceramics are explored. The experimental results show that TiB 2 ‐B 4 C composite ceramic achieves relatively good comprehensive properties and exceptionally excellent flexural strength when the addition amount of B 4 C reaches 10 wt.%. Its relative density, Vickers hardness, fracture toughness, and flexural strength reach to 99.20%, 24.65 ± .66 GPa, 3.16 MPa·m 1/2 , 730.65 ± 74.11 MPa, respectively.