Effect of controllable decomposition of MAX phase (Ti3SiC2) on mechanical properties of rapidly sintered polycrystalline diamond by HPHT. Issue 13 (September 2019)

• Record Type: Journal Article
• Authors: Lv, Xiaoxin; Jian, Qi; Li, Zhihong; Sun, Kun; Ji, Huanli; Zhu, Yumei
• Is Part Of: Ceramics international. Volume 45:Issue 13(2019)
• Page Start: 16564
• Page End: 16568
• Publication Date: 2019-09
• Subjects: HTHP -- MAX phase -- Mechanical properties -- Binder -- PCD; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.05.193
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Sintered polycrystalline diamond (PCD) was prepared via high temperature and high pressure (HTHP) process using Ti3 SiC2 and Si as the binder. The effect of decomposition of Ti3 SiC2 on comprehensive properties of PCD was investigated at different temperatures. Results show that Si formed liquid phase infiltrated diamond surface at high temperatures to inhibit diamond graphitization and to reduce defects significantly. In addition, strong covalent bond of Si-diamond was generated, which increased the strength of PCD. At suitable temperature, Ti3 SiC2 would partially decompose to TiC and SiC with high activity. Strong covalent bond of TiC and SiC also increased relative density and hardness of PCD, and residual Ti3 SiC2 enhanced the toughness of PCD. At 1500 °C, the hardness and toughness of PCD reached 54.35 GPa and 8.6 MPa m 1/ 2, respectively, which are 19% and 82%, respectively, higher than PCD sintered at 1350 °C.