TiB₂ / B₄ C 复相陶瓷自蔓延热爆炸烧结与性能表征

In order to explore the efficient and low-cost preparation method of high hardness composite ceramics, the titanium diboride / boron carbide (TiB₂ / B₄ C) composite ceramics with a thickness of about 1 cm and a diameter of about 5 cm was fabricated by SHS-assisted shock sintering method. The results of phase and microstructure analysis show that TiB₂ phase and B₄ C phase are evenly distributed in the sintered samples, and dense micron particles are observed in the cross section. The density and hardness of the samples prepared by this method are relatively high. The density ranges from 90% to 93% with the change of shock pressure, and the corresponding average Vickers hardness ranges from 16. 64 GPa to 17. 35 GPa. The analysis of the microstructures and densities of the recovered samples under different conditions show that the shock pressure and the pre-detonation temperature have an important effect on the consolidated quality of TiB₂ / B₄ C composite ceramics. When the shock pressure is 40 GPa and the temperature is 1 500 益, the density of sintered sample is 93% . The shock pressure or shock time should be increased to improve the sintering quality. The results show that SHS-assisted shock sintering method is an efficient and low-cost preparation method for high hardness composite ceramics.