期刊
CERAMICS INTERNATIONAL
卷 47, 期 18, 页码 26134-26143出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.06.021
关键词
Boron carbide; Reactive spark plasma sintering; Titanium diboride; Ball milling; Densification; Activation energy
资金
- Institute Research and Development Award from Indian Institute of Technology Madras [MET1617839RFIRSRRB]
Sintering of pure B4C requires extremely high temperatures, but in this study, sintering at low temperature was achieved using a reactive Ti-B mixture as a sintering additive. The resulting B4C composite compacts had a pore free microstructure with improved hardness.
Sintering of pure B4C requires extremely high temperatures of more than 1800 degrees C, even with techniques such as spark plasma sintering (SPS). In this study, sintering of B4C was achieved at low temperature using reactive Ti-B mixture as a sintering additive. Ti and B powders (1:2 atom ratio) were milled for 8 h and added to B4C powder in proportions of 5, 10, and 20 wt% and milled for 4 h to achieve good dispersion. Dense B4C composite compacts were obtained using SPS at 1400 degrees C. A pore free microstructure consisting of B4C grains surrounded with fine grains of (Ti0.9W0.1)B-2 and W2B5 was obtained due to WC contamination. The activation energy for sintering reduced from 234 to 155 kJ/mol with the increase in the amount of Ti-B mixture from 5 to 20 wt%. The B4C composite with 5 wt% Ti-B mixture had the maximum hardness of 3225 +/- 218 H V.
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