Effect of controllable decomposition of MAX phase (Ti3SiC2) on mechanical properties of rapidly sintered polycrystalline diamond by HPHT |
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| Affiliation: | 1. The Institute of Advanced Manufacturing Technology, 37a Wroclawska St., 30-011 Krakow, Poland;2. Silesian University of Technology, Faculty of Materials Engineering, 8 Krasińskiego, 40-019 Katowice, Poland;1. Institute of Advanced Manufacturing Technology, Centre for Materials Research and Sintering Technology, Krakow, Poland;2. AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Krakow, Poland;3. Jagiellonian University, Faculty of Chemistry, Krakow, Poland |
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| Abstract: | Sintered polycrystalline diamond (PCD) was prepared via high temperature and high pressure (HTHP) process using Ti3SiC2 and Si as the binder. The effect of decomposition of Ti3SiC2 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, Ti3SiC2 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 Ti3SiC2 enhanced the toughness of PCD. At 1500 °C, the hardness and toughness of PCD reached 54.35 GPa and 8.6 MPa m1/2, respectively, which are 19% and 82%, respectively, higher than PCD sintered at 1350 °C. |
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| Keywords: | HTHP MAX phase Mechanical properties Binder PCD |
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