Ablative Property of C/C-SiC-HfC Composites Prepared via Precursor Infiltration and Pyrolysis under 3,000°C Oxyacetylene Torch

doi:10.1007/s40195-014-0110-y

Abstract

Abstract:

C/C-SiC-HfC composites were fabricated via precursor infiltration and pyrolysis using a mixture solution of organic hafnium-containing polymer and polycarbosilane as precursor. The microstructures and the phases of the composites were analyzed by scanning electron microscopy and X-ray diffraction. The ablation resistance of the composites was evaluated under 3,000^°C oxyacetylene torch. After ablation for 120s, the composites exhibit good ablation properties with the linear and mass ablation rates of 9.1×10^-4mm/s and 1.30×10^-3g/s, which are far lower than those of the C/C-SiC composites. The excellent ablative property of the C/C-SiC-HfC composites is resulted from the formation of HfO₂ molten layer on the surface of the composites, which could play a positive role in reducing heat transfer and preventing oxygen transport to the underlying carbon substrate.

Key words: C/C-SiC-HfC composite, Ablation performance, Thermal behavior

Yan Min, Li Hejun, Fu Qiangang, Xie Jing, Liu Lei, Feng Bo. Ablative Property of C/C-SiC-HfC Composites Prepared via Precursor Infiltration and Pyrolysis under 3,000^°C Oxyacetylene Torch[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(6): 981-987.

Figures/Tables 8

Fig. 1 Schematic procedure for the preparation of C/C-SiC-HfC composites

Table 1 Ablation test parameters of the oxyacetylene torch

Flux (L/s)		Pressure (MPa)		Heat flux (MW/m²)	Ablation angle (°)
O₂	C₂H₂	O₂	C₂H₂	Heat flux (MW/m²)	Ablation angle (°)
0.42	0.31	0.4	0.095	4.2	90

Fig.2 Backscattered electron images and XRD pattern of the cross sections of C/C-SiC composites: a low magnification; b, c high magnification; d XRD pattern

Table2 Ablation properties of the prepared composites

Material	Mass ablation rate	Linear ablation rate
Material	(10^-3 g/s)	(10^-3 mm/s)
C/C-SiC	22.00	5.70
C/C-SiC-HfC	1.30	0.91

Fig. 3 Surface morphologies of C/C-SiC a and C/C-SiC-HfC b composites ablated by oxyacetylene torch for 120 s

Fig. 4 SEM micrographs of center ablation region of C/C-SiC a and C/C-SiC-HfC b composites ablated by oxyacetylene torch for 120 s; c high magnification of area A in b; d XRD pattern of C/C-SiC-HfC

Fig. 5 SEM micrographs of fringe ablation region of C/C-SiC a; C/C-SiC-HfC c composites ablated by oxyacetylene torch for 120 s; b high magnification of a; d, e high magnification of area A and B in c, respectively; f, g, h EDS analysis of Spectrum 1,2and 3

Fig. 6 Thermal conductivity of the C/C-SiC and C/C-SiC-HfC composites from 100 to 2,300 °C

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