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Ramanujam, P.
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article
Thermal ablation performance of Cf-HfB2 composites with and without a C matrix deposited by CVI
Abstract
<p>C<sub>f</sub>-HfB<sub>2</sub>-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<sub>f</sub>-HfB<sub>2</sub> and C<sub>f</sub>-HfB<sub>2</sub>/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<sub>f</sub>-HfB<sub>2</sub> samples performed slightly better when tested for 60 s due to the presence of a surface layer of HfB<sub>2</sub> powder, the C<sub>f</sub>-HfB<sub>2</sub>/C composites were significantly superior when tested at nearly 3000<sup>o</sup>C 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<sub>f</sub>-HfB<sub>2</sub> samples, which remained very porous. It is the presence of the viscous molten hafnia that is believed to offer the protection in this system.</p>