Mechanical behavior of diamond matrix composites with ceramic Ti3(Si,Ge)C2 bonding phase |
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| Affiliation: | 1. Institute of Advanced Manufacturing Technology, 37a Wroclawska St., 30-011 Krakow, Poland;2. Institute of Electronic Materials Technology, 133 Wolczynska St., 01-919 Warsaw, Poland;3. Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Krakow 30-059, Poland;1. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625 Renmin Street, Changchun 130022, Jilin, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Polycrystalline diamond, PCD, compacts are usually produced by high pressure–high temperature (HP–HT) sintering. This technique always introduces strong internal stresses into the compacts, which may result in self-fragmentation or graphitization of diamond. This may be prevented by a bonding phase and Ti3(Si,Ge)C2 was so investigated. This layered ceramic was produced by Self Propagating High Temperature Synthesis and the product milled. The Ti3(Si,Ge)C2 milled powder was mechanically mixed, in the range 10 to 30 wt.%, with 3–6 μm diamond powder (MDA, De Beers) and compacted into disks 15 mm in diameter and 5 mm high. These were sintered at a pressure of 8.0 GPa and temperature of 2235 K in a Bridgman-type high pressure apparatus. The amount of the bonding phase affected the mechanical properties: Vickers hardness from 20.0 to 60.0 GPa and Young's modulus from 200 to 500 GPa, with their highest values recorded for 10 wt.% Ti3(Si,Ge)C2. For this composite fracture toughness was 7.0 MPa m1/2, tensile strength 402 MPa and friction coefficient 0.08. Scanning and transmission electron microscopy, X-ray and electron diffraction phase analysis were used to examine the composites. |
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