Processing of preceramic polymer to low density silicon carbide foam. (15th February 2017)

• Record Type: Journal Article
• Authors: Jana, Prasanta; Zera, Emanuele; Sorarù, Gian Domenico
• Is Part Of: Materials & design. Volume 116(2017)
• Page Start: 278
• Page End: 286
• Publication Date: 2017-02-15
• Subjects: Replica method -- Polyurethane foam -- Polymer-derived ceramics -- Silicon carbide foam; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.12.010
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: A method is described here for preparing lightweight and low cost polymer-derived silicon carbide foam by impregnation of preceramic polymer in polyurethane foam. A series of silicon carbide foams with various density (0.035–0.35 g/cm 3 ), porosity (87–98%) and thermal conductivity (0.05–0.12 W/m·K) were prepared using allylhydropolycarbosilane as a base material. Surface analysis shows that the resultant foams have an open and interconnected porous structure. Phase analysis shows that it has cubic crystal structure. There was no evidence of cracks or damage even after treating the silicon carbide foam with concentrated hydrofluoric acid for 12 days. From the oxidation resistance experiment, it can be concluded that the silicon carbide foam is stable up to 1500 °C in air and 2000 °C in argon. Graphical abstract: Highlights: Lightweight and low cost silicon carbide foam is prepared by polymer derived ceramic route. Silicon carbide foam shows interconnected open cell structure made of solid strut. It has good structural stability at very high temperature. It is stable in reactive environments.