Properties of C f /SiC-ZrB 2 -Ta x C y composite produced by reactive hot pressing and polymer impregnation pyrolysis (RHP/PIP)

Kannan, R and Rangaraj, L (2019) Properties of C f /SiC-ZrB 2 -Ta x C y composite produced by reactive hot pressing and polymer impregnation pyrolysis (RHP/PIP). Journal of the European Ceramic Society, 39 (7). pp. 2257-2265. ISSN 09552219

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Abstract

C f /SiC-ZrB 2 -Ta x C y composite was synthesized by reactive hot pressing (RHP) of C f cloth, polycarbosilane (PCS), ZrB 2 , and Ta powders at 4 MPa and 1200 °C. PIP cycle influenced sintering process by increasing density of the composite from 2.34 to 2.82 g/cc. Residual carbon produced during the PIP cycles at 1200 °C was utilized to yield Ta x C y by the addition of Ta. SEM images illustrate that by increasing the number of PIP cycles, SiC derived from the PCS cover the C f fibre, micropores, and cracks. PIP cycles and Ta x C y phase improved flexural strength of the composite from 20 to 114 MPa. Mass and linear ablation resistance studies at 1600–2000 °C exhibited that oxide formation at the outer surface caused a barrier; further, no oxidation underneath the composite was observed. SEM images display that at 2000 °C, SiO 2 and Ta x O y were molten and sealed the pores. Hence, ablation resistance was enhanced by blocking the penetration in high-temperature flame.

Item Type: Article
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User: Mrs SK Pratibha
Date Deposited: 30 Mar 2021 09:07
Last Modified: 30 Mar 2021 09:07
URI: http://nal-ir.nal.res.in/id/eprint/13386

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