Processing of Cf/SiC composites by hot pressing using polymer binders followed by polymer impregnation and pyrolysis.

Stalin, M and Rajaguru, K and Rangaraj, L (2020) Processing of Cf/SiC composites by hot pressing using polymer binders followed by polymer impregnation and pyrolysis. Journal of the European Ceramic Society, 40 (2). pp. 290-297. ISSN 09552219

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Abstract

Continuous carbon fiber (Cf) reinforced silicon carbide (SiC) matrix composite (Cf/SiC) was processed through hot pressing (HP) using polycarbosilane (PCS) in matrix and polysilazane in interphase regions as polymer binders. HP experiments were conducted at 4 MPa, 1200 °C and 1 h; followed by PCS polymer impregnation and pyrolysis (PIP) at 1200 °C under vacuum. The BN/SiC-Si3N4 interphase formed on the Cf cloth during BN dispersed polysilazane polymer coating and pyrolysis. The influence of PCS quantity during HP experiments on Cf/SiC composites was studied. Results suggest that sintering of SiC matrix in Cf/SiC composite improves by increasing PCS content during HP; however, high PCS content increases the liquidity of SiC-PCS mixture to flow out of the composite structure. The Cf/SiC composites with relative density ranging from 79 to 83% and flexural strength from 67 to 138 MPa was achieved.

Item Type: Article
Uncontrolled Keywords: Hot pressing, Polymer impregnation pyrolysis,Flexural strength
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
ENGINEERING > Mechanical Engineering
Depositing User: Mrs. Usha Kumari
Date Deposited: 23 Nov 2021 11:36
Last Modified: 23 Nov 2021 11:36
URI: http://nal-ir.nal.res.in/id/eprint/13417

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