Ultra-high elevated temperature strength of TiB2-based ceramics consolidated by spark plasma sintering
Journal of the European Ceramic Society(2017)
摘要
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 TiB2–10wt.% boron ceramic composites reached 910MPa at room temperature and 1105MPa 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 480–620MPa, which was confirmed by increased number of cavitated titanium diboride grains observed after flexural strength tests.
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关键词
Spark plasma sintering,Titanium diboride,Amorphous boron,High-temperature strength
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