Ablation Mechanism of HfC-HfO2 Protective Coating for SiC-Coated C/C Composites in an Oxyacetylene Torch Environment

doi:10.1016/j.jmst.2016.11.010

Abstract

Yang Yang, Li Kezhi, Liu Guanxi, Zhao Zhigang. Ablation Mechanism of HfC-HfO2 Protective Coating for SiC-Coated C/C Composites in an Oxyacetylene Torch Environment[J]. J. Mater. Sci. Technol., 2017, 33(10): 1195-1202.

Figures/Tables 11

Table 1 Details of the spraying parameters for HfC-HfO2 coating

Content	Parameters
Spraying current (A)	400
Spraying voltage (V)	120
Primary gas Ar (L/min)	75
Carrier gas Ar (L/min)	10
Second gas H₂ (L/min)	5
Powder feed rate (g/min)	30
Spraying distance (mm)	100
Nozzle diameter (mm)	5.5

Fig. 1. SEM image of HfC-HfO2 precursor.

Fig. 2. XRD patterns of HfC-HfO2 before and after spraying.

Fig. 3. Surface SEM images of HfC-HfO2 coating: (a) low magnification; (b) high magnification.

Fig. 4. Cross-sectional micrograph and element map analyses of HfC-HfO2 coating: (a) cross-sectional micrograph; (b) Hf element; (c) C element; (d) O element.

Fig. 5. Surface temperature variation and mass ablation rates of HfC-HfO2 coatings.

Fig. 6. XRD patterns of the HfC-HfO2 coatings after ablation for different time.

Fig. 7. Surface morphology of HfC-HfO2 coatings in the ablation center region after ablation for different time: (a) 30 s; (b) 60 s; (c) 90 s; (d) 120 s.

Fig. 8. Surface morphologies of HfC-HfO2 coating: (a) before ablation; (b) after ablation.

Fig. 9. Cross-sectional morphologies and EDS analyses of the HfC-HfO2 coating after ablation for different time: (a) 30 s; (b) 60 s; (c) 90 s; (d) 120 s; (e) EDS of spot A; (f) EDS of spot B.

Fig. 10. Ablation schematic of the HfC-HfO2 coating: (a) before ablation; (b) initial stage of ablation; (c) middle stage of ablation; (d) final stage of ablation.

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