J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (8): 1700-1705.DOI: 10.1016/j.jmst.2019.04.006
• Orginal Article • Previous Articles Next Articles
Heng Chenab, Huimin Xianga, Fu-Zhi Daia, Jiachen Liub, Yiming Leic, Jie Zhangc, Yanchun Zhouab*()
Received:
2019-03-27
Revised:
2019-03-30
Accepted:
2019-03-31
Online:
2019-08-05
Published:
2019-06-19
Contact:
Zhou Yanchun
About author:
1The authors contributed equally to this work.
Heng Chen, Huimin Xiang, Fu-Zhi Dai, Jiachen Liu, Yiming Lei, Jie Zhang, Yanchun Zhou. High porosity and low thermal conductivity high entropy (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C[J]. J. Mater. Sci. Technol., 2019, 35(8): 1700-1705.
Fig. 1. The linear shrinkage, linear shrinkage rate, TG and DTG curves recorded during the heating of green body of porous HE (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C.
Porous UHTCs | Porosity (%) | Sintered density (g·cm-3) | Theoretical density (g·cm-3) | Radial shrinkage (%) | Compressive strength (MPa) |
---|---|---|---|---|---|
(Zr0.2Hf0.2Ti0.2 Nb0.2Ta0.2)C | 80.99 | 1.79 | 9.42 | 14.21 | 3.45 |
NbC | 80.13 | 1.55 | 7.79 [ | 15.93 | 5.01 |
TiC | 80.24 | 0.97 | 4.91 [ | 24.13 | 4.39 |
TaC | 82.62 | 2.52 | 14.50 [ | 18.56 | 3.02 |
ZrC | 68.74 | 2.06 | 6.59 [ | 21.97 | 8.28 |
HfC | 77.82 | 2.82 | 12.67 [ | 20.30 | 5.51 |
Table 1 Porosity, sintered density, theoretical density, radical shrinkage and compressive strength of porous HE (Zr0.2Hf0.2Ti0.2Nb0.2 Ta0.2)C together with those of TiC, NbC, TaC, ZrC [25], HfC [25] for comparison.
Porous UHTCs | Porosity (%) | Sintered density (g·cm-3) | Theoretical density (g·cm-3) | Radial shrinkage (%) | Compressive strength (MPa) |
---|---|---|---|---|---|
(Zr0.2Hf0.2Ti0.2 Nb0.2Ta0.2)C | 80.99 | 1.79 | 9.42 | 14.21 | 3.45 |
NbC | 80.13 | 1.55 | 7.79 [ | 15.93 | 5.01 |
TiC | 80.24 | 0.97 | 4.91 [ | 24.13 | 4.39 |
TaC | 82.62 | 2.52 | 14.50 [ | 18.56 | 3.02 |
ZrC | 68.74 | 2.06 | 6.59 [ | 21.97 | 8.28 |
HfC | 77.82 | 2.82 | 12.67 [ | 20.30 | 5.51 |
Fig. 2. (a) XRD patterns of as-prepared porous HE (Zr0.2Hf0.2Ti0.2Nb0.2 Ta0.2)C and TiC, NbC, TaC, ZrC [25] and HfC [25], (b) SEM micrograph of as-prepared porous HE (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C with porosity of 80.99%.
Fig. 3. TEM-EDS analysis of porous HE (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C, (a) TEM micrograph, (b)-(f) the corresponding EDS mapping of Zr, Hf, Ti, Nb and Ta elements.
Temp (oC) | Dense (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C | Porous (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C | ||||
---|---|---|---|---|---|---|
α (mm2 ·s-1) | Cp (J·mol-1 ·K-1) | κ (W·m-1 ·K-1) | α (mm2 ·s-1) | Cp (J·mol-1 ·K-1) | κ (W·m-1 ·K-1) | |
25 | - | - | - | 0.74 | 38.56 | 0.39 |
29.5 | 3.6 | 24.89 | 6.45 | 0.74 | 38.88 | 0.40 |
50.7 | 3.68 | 20.98 | 5.56 | 0.76 | 40.28 | 0.42 |
70.8 | 3.73 | 20.19 | 5.42 | 0.76 | 41.42 | 0.43 |
100 | - | - | - | 0.75 | 42.60 | 0.44 |
200 | - | - | - | 0.80 | 44.73 | 0.49 |
Table 2 Thermal diffusivity (α), specific heat capacity (Cp) and thermal conductivity (κ) of dense (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C [21] and porous HE (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C prepared in this work.
Temp (oC) | Dense (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C | Porous (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C | ||||
---|---|---|---|---|---|---|
α (mm2 ·s-1) | Cp (J·mol-1 ·K-1) | κ (W·m-1 ·K-1) | α (mm2 ·s-1) | Cp (J·mol-1 ·K-1) | κ (W·m-1 ·K-1) | |
25 | - | - | - | 0.74 | 38.56 | 0.39 |
29.5 | 3.6 | 24.89 | 6.45 | 0.74 | 38.88 | 0.40 |
50.7 | 3.68 | 20.98 | 5.56 | 0.76 | 40.28 | 0.42 |
70.8 | 3.73 | 20.19 | 5.42 | 0.76 | 41.42 | 0.43 |
100 | - | - | - | 0.75 | 42.60 | 0.44 |
200 | - | - | - | 0.80 | 44.73 | 0.49 |
Fig. 4. (a) Linear shrinkage curve of porous HE (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C during its synthesis process and during the second round heat treatment, (b) SEM micrograph of porous HE (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C after second round heat treatment, (c) XRD pattern of as-prepared porous HE (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C and that after second round heat treatment.
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