Alkali-bonded SiC based foams |
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| Authors: | Valentina Medri Andrea Ruffini |
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| Affiliation: | 1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Republic of Korea;2. Engineering Ceramics Group, Korea Institute of Materials Science, Changwon 641-010, Republic of Korea;1. Materials and Ceramic Engineering Department, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal;2. Institute of Materials and Structures, Riga Technical University, Latvia;1. Graduate Program on Materials Science and Engineering, Federal University of São Carlos, Via Washington Luiz, km 235, São Carlos, SP, Brazil;2. Dipartimento di Ingegneria Industriale, Università degli Studi di Padova, via Marzolo, 9, Padova, Italy;3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA |
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| Abstract: | Silicon carbide (SiC) foams were developed by using a low temperature process such as chemical consolidation that is suitable to replace the sintering step. An alkali aluminosilicates binder, also known as geopolymer, was used. It was prepared from metakaolin, as aluminosilicatic raw powder, and KOH/K2SiO3 aqueous solution. The foaming agent was the metallic silicon present as impurity in SiC powders. Different grades of SiC were used as the main component (90 wt%) of the foams and the micro and macrostructures varied with the morphologies of the SiC raw powders. The surface of SiC grains participates to the geopolymeric process because of the dissolution of the silica layer into the alkaline solution. SiC foams were tested and characterized under oxidative atmospheres up to 1200 °C. |
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