Microstructure and Properties of TiB2-TiC-SiC Ternary Phase Ceramics Produced by High-Gravity Field Activated SHS of Ti-Si-B4C Powders

4th Annual International Workshop on Materials Science and Engineering

Pan, Chuanzeng^1 ; Zhang, Jing^1 ; Han, Kai^1 ; Yin, Yujun^1

Army Engineering University, 97 Heping west road, Shijiazhuang

050003, China^1

关键词: Activated combustion;    Ceramic matrix;    Crack deflections;    High-gravity field;    Microstructure and properties;    Mixing powder;    Relative density;    Strength and toughness;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012056/pdf
DOI  :  10.1088/1757-899X/381/1/012056

来源: IOP

【 摘 要 】

TiB2-TiC-SiC ternary phase ceramics have been prepared by high-gravity activated combustion synthesis using (Ti-Si-B4C) mixing powders. XRD, FESEM and FETEM results show that the ceramic matrix was mainly composed of TiB2, TiC and β-SiC. Uniformly-distributed TiB2 platelets formed the skeleton of ceramics, and irregular TiC and β-SiC solids were embedded between TiB2 platelets. The relative density, Vickers hardness and fracture toughness of the ternary phase ceramics were measured with values of 97.9 %, 22.2 GPa and 10.1 MPa•m0.5. The high-fraction randomly-orientated TiB2 platelets were found to induce continuous crack deflection, and consumed more energy from the crack tip, thereby enhanced the strength and toughness of TiB2-TiC-SiC ceramics.