Wear Resistance of TiB2-TiC Solidified Ceramics Using for Cutting Tools Fabricated through Combustion Synthesis in the High-Gravity Field

4th Annual International Workshop on Materials Science and Engineering

Yin, Yujun^1 ; Zhang, Jing^1 ; Pan, Chuanzeng^1 ; Zhu, Bing^1

Army Engineering University, 97 Heping west road, Shijiazhuang

050003, China^1

关键词: Fine grained;    Fine-grained microstructure;    High hardness;    High toughness;    High-gravity field;    Inclusion particles;    Key factors;    Wear properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012054/pdf
DOI  :  10.1088/1757-899X/381/1/012054

来源: IOP

【 摘 要 】

TiB2-TiC solidified ceramics were fabricated by taking combustion synthesis with the blends of (B4C+Ti) powders and (CrO3+Al) thermite in the high-gravity field of 300 g. XRD, FESEM and EDAX results showed that the composites mainly were consisted of fine plate-like TiB2, irregular TiC and (Cr, Ti)3B2 solids and Al2O3 inclusion particles. The introduction of high-gravity field was thought to bring about pure Ti-Cr-B-C liquid. Rapid solidification was a key factor for the achievement of fine-grained microstructure, which in turn was responsible for the improved wear properties of the composites.Vickers hardness, fracture toughnessandmaximum wear rate of the composites were measured 20.8GPa, 13.4MPa•m05 and 2.5×10-7g•(N•m)-1, respectively.The excellent wear resistance of the composites was considered resulting from the contribution of the high-toughness, high-hardness, fine-grained TiB2 plate-like primary phases.