In this feasibility study, the possibility to develop silicon carbide foams with a low temperature process such as chemically bonding was investigated. A coarse and re-crystallized ?-SiC was used as the main powder component. The important characteristics of R-SiC are ability to withstand high working temperatures, excellent corrosion resistance, good thermal shock resistance and high thermal conductivity. The binder for the chemical bonding was prepared using metakaolin as aluminosilicatic raw powder, while the alkali aqueous solution was KOH/K2SiO3. The surface reaction of the SiC particles in the alkaline solution leads to gas evolution that induces the foaming of the slurries. The foams were tested in inert and oxidative atmospheres up to 1300°C and characterized
Alkali bonded SiC based foams: material development and high temperature behaviour
Medri Valentina;Ruffini Andrea;
2011
Abstract
In this feasibility study, the possibility to develop silicon carbide foams with a low temperature process such as chemically bonding was investigated. A coarse and re-crystallized ?-SiC was used as the main powder component. The important characteristics of R-SiC are ability to withstand high working temperatures, excellent corrosion resistance, good thermal shock resistance and high thermal conductivity. The binder for the chemical bonding was prepared using metakaolin as aluminosilicatic raw powder, while the alkali aqueous solution was KOH/K2SiO3. The surface reaction of the SiC particles in the alkaline solution leads to gas evolution that induces the foaming of the slurries. The foams were tested in inert and oxidative atmospheres up to 1300°C and characterizedI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
