Journal of Inorganic Materials, Volume. 35, Issue 8, 931(2020)
Figures & Tables(10)
2. Microstructure and EDS element mapping of the amorphous SiBCN powders
4. EFTEM images (a) and EELS spectra (b) of the amorphous SiBCN powders
5. XRD patterns of the SiBCN/HfC ceramic composites before and after heat-treatement for 1 h at different temperatures
6. Microstructure (a) and EDS element overlap mapping (b) of the as-sintered SiBCN/HfC ceramic composites, and its corresponding element distribution displayed in lower two rows
7. TEM images of the SiBCN/HfC ceramic composites (a) before and (b) after heat treatment at 1800 ℃with insets showing the corresponding SAED patterns of dark area in (a) and (b)
8. Change of standard Gibbs free energies of reactions (1)-(9) as a function of temperature
9. Surface morphologies and corresponding EDS results of the SiBCN/HfC ceramic composites before and after heat treatment at different temperatures
Table 1. Change of standard Gibbs free energies of reactions (6-9) at different heat treatment temperature
View tableView in ArticleTable 1. Change of standard Gibbs free energies of reactions (6-9) at different heat treatment temperature
Reaction Δ G 1300 ℃/(kJ·mol-1)Δ G 1400 ℃/(kJ·mol-1)Δ G 1500 ℃/(kJ·mol-1)Δ G 1600 ℃/(kJ·mol-1)Δ G 1650 ℃/(kJ·mol-1)Δ G 1800 ℃/(kJ·mol-1)HfO2 + B2O3 + 5C = HfB2 + 5CO(g) 169.8 91.0 12.6 -65.3 -104.1 -210.0 HfO2 + 2BN + 2C = HfB2 + 2CO(g) + N2(g) 246.5 196.6 146.9 97.4 72.8 -0.7 HfO2 + 3C = HfC + 2CO(g) 115.6 82.1 48.8 15.7 -0.8 -50.1 HfC + 2C + B2O3 = HfB2 + 3CO(g) 54.1 8.8 -36.2 -81.0 -103.3 -169.9
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Yuquan WEI, Yong YANG, Meng LIU, Qile LI, Zhengren HUANG.
Paper Information
Category: RESEARCH PAPER
Received: Nov. 25, 2019
Accepted: --
Published Online: Mar. 15, 2021
The Author Email: YANG Yong (yangyong@mail.sic.ac.cn), HUANG Zhengren (zhrhuang@mail.sic.ac.cn)
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