Silicon carbide-based foams derived from foamed SiC-filled phenolic resin by reactive infiltration of silicon. Issue 13 (October 2016)

• Record Type: Journal Article
• Authors: Xu, Shao-Chun; Zhang, Nan-Long; Yang, Jian-Feng; Wang, Bo; Kim, Chang-Yeoul
• Is Part Of: Ceramics international. Volume 42:Issue 13(2016)
• Page Start: 14760
• Page End: 14764
• Publication Date: 2016-10
• Subjects: SiC -- Phenolic resin -- Foaming -- Reactive infiltration -- Porosity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.06.104
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Macro-cellular porous silicon carbide-based foams were fabricated by reactive infiltration of melt silicon into porous carbonaceous preforms pyrolyzed from foamed SiC-filled phenolic resins (PF). The SiC-filled PF foams were prepared at 80 °C with different heating rate. The effect of heating rate on the foaming behavior of the liquid SiC-filled PF mixture and the microstructure of the foams were investigated. The foamed SiC-filled PF was then pyrolyzed at 1000 °C and infiltrated by melt Si at 1600 °C, leading to the formation of open macro-cellular structure. At a heating rate of 6 °C min −1, Si-infiltrated foams with a porosity of ~72% and a mean pore size of ~0.5 mm were obtained. The Si-infiltrated foams with dense struts mainly inherited the pore structure of pyrolyzed preforms. The main phases of SiC-based foams were α-SiC, β-SiC and the remnant Si, which contributed to high compressive strength of the SiC-based foams.