Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (11): 1141-1146.DOI: 10.15541/jim20170012
• RESEARCH PAPER • Previous Articles Next Articles
ZUO Ya-Zhuo, LI Hong, WANG Shao-Lei, YANG Min, REN Mu-Su, SUN Jin-Liang
Received:2017-01-06
Revised:2017-03-21
Published:2017-11-20
Online:2017-10-20
CLC Number:
ZUO Ya-Zhuo, LI Hong, WANG Shao-Lei, YANG Min, REN Mu-Su, SUN Jin-Liang. Ablation Behavior of (C-SiC)f/C Composites[J]. Journal of Inorganic Materials, 2017, 32(11): 1141-1146.
Fig. 1 Processing scheme of manufacturing (C-SiC)f/C composites
| Sample | Structure | Density/ (g•cm-3) | Open porosity | Mass fraction of SiC/% |
|---|---|---|---|---|
| (C-SiC)f/C | CF felt/ SiCF felt | 1.80 | 8.0% | 5%-6% |
| C/C | CF felt | 1.80 | 5.1% | 0 |
Table 1 Basic parameters of (C-SiC)f/C and C/C composites
| Sample | Structure | Density/ (g•cm-3) | Open porosity | Mass fraction of SiC/% |
|---|---|---|---|---|
| (C-SiC)f/C | CF felt/ SiCF felt | 1.80 | 8.0% | 5%-6% |
| C/C | CF felt | 1.80 | 5.1% | 0 |
Fig. 2 Illustrations of the (C-SiC)f/C composites ablation test
Fig. 3 XRD pattern of (C-SiC)f/C composites
Fig. 4 Cross-sectional morphologies and EDS spectrum (insert) of (C-SiC)f/C composites (a) Low magnification; (b) High magnification
| Samples | Ablation time/s | Linear ablation rate/(μm·s-1) | Mass ablation rate/(mg·s-1) |
|---|---|---|---|
| (C-SiC)f/C | 750 | 1.88 | 2.16 |
| C/C | 750 | 5.29 | 8.14 |
Table 2 Linear and mass ablation rates of (C-SiC)f/C and C/C
| Samples | Ablation time/s | Linear ablation rate/(μm·s-1) | Mass ablation rate/(mg·s-1) |
|---|---|---|---|
| (C-SiC)f/C | 750 | 1.88 | 2.16 |
| C/C | 750 | 5.29 | 8.14 |
Fig. 5 Surface macrographs of (C-SiC)f/C composites after ablation (a) (C-SiC)f/C; (b) C/C
Fig. 6 SEM images and EDS spectrum (insert) of the ablation center zone in (C-SiC)f/C composites (a) Low magnification; (b,d) High magnification
Fig. 7 SEM image and EDS spectrum (insert) in ablation transitional zone in (C-SiC)f/C composites
Fig. 8 SEM images and EDS spectrum (insert) of ablation marginal zone at different places in (C-SiC)f/C composites (a) Near the transitional zone; (b) Edge of the marginal zone
Fig. 9 Element analysis of (C-SiC)f/C composite ablation sample
| No. | Reaction |
|---|---|
| 1 | SiC(s) → SiC(l) |
| 2 | 2/3SiC(s) + O2(g) → 2/3SiO2(s) + 2/3CO(g) 2/3SiC(s) + O2(g) → 2/3SiO2(l) + 2/3CO(g) 2/3SiC(l) + O2(g) → 2/3SiO2(g) + 2/3CO(g) |
| 3 | 1/2SiC(s) + O2(g) → 1/2SiO2(s) + 1/2CO2(g) 1/2SiC(s) + O2(g) → 1/2SiO2(l) + 1/2CO2(g) 1/2SiC(l) + O2(g) → 1/2SiO2(g) + 1/2CO2(g) |
| 4 | SiC(s) + O2(g) → SiO(g) + CO(g) |
| 5 | 2/3SiC(s) + O2(g) → 2/3SiO(g) + 2/3CO2(g) |
| 6 | SiO2(l) → SiO2(g) |
| 7 | SiO2(l) + CO(g) → SiO(g) + CO2(g) |
| 8 | SiO2(l) + C(s) → SiO(g) + CO(g) |
| 9 | 1/3SiO2(l) + C → 1/3SiC(s) + 2/3CO(g) 1/3SiO2(g) + C → 1/3SiC(s) + 2/3CO(g) 1/3SiO2(g) + C → 1/3SiC(l) + 2/3CO(g) |
| 10 | 1/2SiO2(l) + C → 1/2SiC(s) + 1/2CO2(g) 1/2SiO2(g) + C → 1/2SiC(s) + 1/2CO2(g) 1/2SiO2(g) + C → 1/2SiC(l) + 1/2CO2(g) |
| 11 | SiC(s) + 2SiO2(l) → 3SiO(g) + CO SiC(l) + 2SiO2(g) → 3SiO(g) + CO |
| 12 | C(s) + O2(g) → CO2(g) |
| 13 | 2C(s) + O2(g) → 2CO(g) |
| 14 | C(s) + H2O(g) → CO(g) + H2(g) |
Table 3 Main reactions occured in thermo-chemical ablation process
| No. | Reaction |
|---|---|
| 1 | SiC(s) → SiC(l) |
| 2 | 2/3SiC(s) + O2(g) → 2/3SiO2(s) + 2/3CO(g) 2/3SiC(s) + O2(g) → 2/3SiO2(l) + 2/3CO(g) 2/3SiC(l) + O2(g) → 2/3SiO2(g) + 2/3CO(g) |
| 3 | 1/2SiC(s) + O2(g) → 1/2SiO2(s) + 1/2CO2(g) 1/2SiC(s) + O2(g) → 1/2SiO2(l) + 1/2CO2(g) 1/2SiC(l) + O2(g) → 1/2SiO2(g) + 1/2CO2(g) |
| 4 | SiC(s) + O2(g) → SiO(g) + CO(g) |
| 5 | 2/3SiC(s) + O2(g) → 2/3SiO(g) + 2/3CO2(g) |
| 6 | SiO2(l) → SiO2(g) |
| 7 | SiO2(l) + CO(g) → SiO(g) + CO2(g) |
| 8 | SiO2(l) + C(s) → SiO(g) + CO(g) |
| 9 | 1/3SiO2(l) + C → 1/3SiC(s) + 2/3CO(g) 1/3SiO2(g) + C → 1/3SiC(s) + 2/3CO(g) 1/3SiO2(g) + C → 1/3SiC(l) + 2/3CO(g) |
| 10 | 1/2SiO2(l) + C → 1/2SiC(s) + 1/2CO2(g) 1/2SiO2(g) + C → 1/2SiC(s) + 1/2CO2(g) 1/2SiO2(g) + C → 1/2SiC(l) + 1/2CO2(g) |
| 11 | SiC(s) + 2SiO2(l) → 3SiO(g) + CO SiC(l) + 2SiO2(g) → 3SiO(g) + CO |
| 12 | C(s) + O2(g) → CO2(g) |
| 13 | 2C(s) + O2(g) → 2CO(g) |
| 14 | C(s) + H2O(g) → CO(g) + H2(g) |
Fig. 10 Changes of Gibbs-free-energy for the oxidation of SiC and C
Fig. 11 Ablation model of (C-SiC)f/C composites
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