Ultra-high elevated temperature strength of TiB2-based ceramics consolidated by spark plasma sintering |
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| Affiliation: | 1. Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;2. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;1. Department of Materials Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran;2. Department of Materials Science and Engineering, University of Tabriz, Tabriz, Iran;3. Chemistry and Chemical Engineering Research Center of Iran, Iran |
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| Abstract: | Spark plasma sintering of TiB2–boron ceramics using commercially available raw powders is reported. The B4C phase developed during reaction-driven consolidation at 1900 °C. The newly formed grains were located at the grain junctions and the triple point of TiB2 grains, forming a covalent and stiff skeleton of B4C. The flexural strength of the TiB2–10 wt.% boron ceramic composites reached 910 MPa at room temperature and 1105 MPa at 1600 °С. Which is the highest strength reported for non-oxide ceramics at 1600 °C. This was followed by a rapid decrease at 1800 °C to 480–620 MPa, which was confirmed by increased number of cavitated titanium diboride grains observed after flexural strength tests. |
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| Keywords: | Spark plasma sintering Titanium diboride Amorphous boron High-temperature strength |
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