Densification of hard β‐boron based ceramics by spark plasma sintering at larger heating rate.
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| Title: | Densification of hard β‐boron based ceramics by spark plasma sintering at larger heating rate. |
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| Authors: | Xiong, Zhengang1,2 (AUTHOR), Zou, Ji1,2 (AUTHOR) ji.zou@whut.edu.cn, Ma, Haibin3 (AUTHOR), Ji, Wei1,2 (AUTHOR), Wang, Weimin1,2 (AUTHOR), Fu, Zhengyi1,2 (AUTHOR) |
| Source: | Journal of the American Ceramic Society. Sep2025, Vol. 108 Issue 9, p1-9. 9p. |
| Subjects: | Vickers hardness, Thermal plasmas, Thermal properties, Boron, Porosity |
| Abstract: | The densification process of β‐boron via spark plasma sintering (SPS) with controlled heating rates (50–300°C/min) was investigated at different temperatures from 1000°C to 1800°C. Systematic characterization reveals that enhanced heating rates (300°C/min) effectively suppress the volatilization of B2O3 impurities, promoting in situ formation of boron‐rich oxide (B6O) through reactions between boron and B2O3. The amount of the retained B6O phase in the boron matrix increased with heating rates, which effectively accelerate the densification behavior of boron , achieving near‐full density (2.33 g/cm3) with residual porosity < 0.3% in consolidated boron ceramics. Resultant ceramics demonstrate good combination of properties, including high Vickers hardness (31.0 ± 1.8 GPa at 9.8 N) and low thermal conductivity (13.8 W·m−1·K−1 at room temperature and 5.8 W·m−1·K−1 at 873 K), the latter was governed by intensified phonon–phonon scattering with less contributions from electrons (< 1‰). [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The densification process of β‐boron via spark plasma sintering (SPS) with controlled heating rates (50–300°C/min) was investigated at different temperatures from 1000°C to 1800°C. Systematic characterization reveals that enhanced heating rates (300°C/min) effectively suppress the volatilization of B2O3 impurities, promoting in situ formation of boron‐rich oxide (B6O) through reactions between boron and B2O3. The amount of the retained B6O phase in the boron matrix increased with heating rates, which effectively accelerate the densification behavior of boron , achieving near‐full density (2.33 g/cm3) with residual porosity < 0.3% in consolidated boron ceramics. Resultant ceramics demonstrate good combination of properties, including high Vickers hardness (31.0 ± 1.8 GPa at 9.8 N) and low thermal conductivity (13.8 W·m−1·K−1 at room temperature and 5.8 W·m−1·K−1 at 873 K), the latter was governed by intensified phonon–phonon scattering with less contributions from electrons (< 1‰). [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00027820 |
| DOI: | 10.1111/jace.20679 |
