Microstructure and mechanical properties of TiB2-40 wt% TiC composites: Effects of adding a low-temperature hold prior to sintering at high temperatures

作者：Wang, Yujin^*; Yao, Mianyi; Hu, Zhiyi; Li, Haixia; Ouyang, Jia-Hu; Chen, Lei; Huo, Sijia; Zhou, Yu

来源：Ceramics International, 2018, 44(18): 23297-23300.

DOI：10.1016/j.ceramint.2018.09.048

• TiB2-TiC composite
• Two-step pressureless sintering
• TiB2 plates

TiB2-40 wt% TiC composites were prepared by pressureless sintering. Prior to the conventional heating at 2000 degrees C for 1 h for final densification, addition of a low temperature hold at 1500 degrees C for 4 h was found effective in densification of the composite, refining the microstructure and promoting the anisotropic growth of TiB2 grains. The TiB2-TiC composite prepared by two-step sintering had better mechanical properties with flexural strength of 776 MPa and fracture toughness of 7.43 MPa m(1/2), in comparison with the values of 419 MPa and 4.81 MPa m(1/2) for composite by conventional one-step sintering.

• 出版日期2018-12-15
• 单位哈尔滨工业大学