Ultra-high elevated temperature strength of TiB₂-based ceramics consolidated by spark plasma sintering

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• 作者：Dmytro Demirskyi^a ; ^{dmytro.demirskyi@ntu.edu.sg" class="auth_mail" title="E-mail the corresponding author} ; ^{dmytro.demirskyi@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Hanna Borodianska^b ; Yoshio Sakka^b ; Oleg Vasylkiv^a ; ^b ; ^{oleg.vasylkiv@nims.go.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Spark plasma sintering ; Titanium diboride ; Amorphous boron ; High-temperature strength
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：37
• 期：1
• 页码：393-397
• 全文大小：2455 K

文摘

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.