Thermal ablation performance of Cf-HfB2 composites with and without a C matrix deposited by CVI

V. Rubio; P. Ramanujam; D. K. Ramachandran; A. D’angio’; J. G.P. Binner

doi:10.1002/9781119407270.ch21

Thermal ablation performance of C_f-HfB₂ composites with and without a C matrix deposited by CVI

V. Rubio, P. Ramanujam, D. K. Ramachandran, A. D’angio’, J. G.P. Binner

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

C_f-HfB₂-based composites have been produced using a vacuum impregnation route with half of the samples being further densified by the inclusion of a carbon matrix using CVI. Both composites, C_f-HfB₂ and C_f-HfB₂/C, were characterised by oxyacetylene torch testing to determine the effect of the carbon matrix on the thermo-ablative performance. The mass loss of the samples revealed what whilst the C_f-HfB₂ samples performed slightly better when tested for 60 s due to the presence of a surface layer of HfB₂ powder, the C_f-HfB₂/C composites were significantly superior when tested at nearly 3000^oC for 300 s. The reason is believed to be related to the fact that the molten hafnia formed during testing was more absorbed by the C_f-HfB₂ samples, which remained very porous. It is the presence of the viscous molten hafnia that is believed to offer the protection in this system.

Original language	English
Pages (from-to)	211-221
Number of pages	11
Journal	Ceramic Transactions
Volume	263
DOIs	https://doi.org/10.1002/9781119407270.ch21
Publication status	Published - 1 Jan 2018

Keywords

Carbon matrix
Chemical vapor infiltration
Gaseous phase
Thermal ablation

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1002/9781119407270.ch21

Cite this

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title = "Thermal ablation performance of Cf-HfB2 composites with and without a C matrix deposited by CVI",

abstract = "Cf-HfB2-based composites have been produced using a vacuum impregnation route with half of the samples being further densified by the inclusion of a carbon matrix using CVI. Both composites, Cf-HfB2 and Cf-HfB2/C, were characterised by oxyacetylene torch testing to determine the effect of the carbon matrix on the thermo-ablative performance. The mass loss of the samples revealed what whilst the Cf-HfB2 samples performed slightly better when tested for 60 s due to the presence of a surface layer of HfB2 powder, the Cf-HfB2/C composites were significantly superior when tested at nearly 3000oC for 300 s. The reason is believed to be related to the fact that the molten hafnia formed during testing was more absorbed by the Cf-HfB2 samples, which remained very porous. It is the presence of the viscous molten hafnia that is believed to offer the protection in this system.",

keywords = "Carbon matrix, Chemical vapor infiltration, Gaseous phase, Thermal ablation",

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AU - Rubio, V.

AU - Ramanujam, P.

AU - Ramachandran, D. K.

AU - D’angio’, A.

AU - Binner, J. G.P.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Cf-HfB2-based composites have been produced using a vacuum impregnation route with half of the samples being further densified by the inclusion of a carbon matrix using CVI. Both composites, Cf-HfB2 and Cf-HfB2/C, were characterised by oxyacetylene torch testing to determine the effect of the carbon matrix on the thermo-ablative performance. The mass loss of the samples revealed what whilst the Cf-HfB2 samples performed slightly better when tested for 60 s due to the presence of a surface layer of HfB2 powder, the Cf-HfB2/C composites were significantly superior when tested at nearly 3000oC for 300 s. The reason is believed to be related to the fact that the molten hafnia formed during testing was more absorbed by the Cf-HfB2 samples, which remained very porous. It is the presence of the viscous molten hafnia that is believed to offer the protection in this system.

AB - Cf-HfB2-based composites have been produced using a vacuum impregnation route with half of the samples being further densified by the inclusion of a carbon matrix using CVI. Both composites, Cf-HfB2 and Cf-HfB2/C, were characterised by oxyacetylene torch testing to determine the effect of the carbon matrix on the thermo-ablative performance. The mass loss of the samples revealed what whilst the Cf-HfB2 samples performed slightly better when tested for 60 s due to the presence of a surface layer of HfB2 powder, the Cf-HfB2/C composites were significantly superior when tested at nearly 3000oC for 300 s. The reason is believed to be related to the fact that the molten hafnia formed during testing was more absorbed by the Cf-HfB2 samples, which remained very porous. It is the presence of the viscous molten hafnia that is believed to offer the protection in this system.

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