The Effects of SiC Grain Size on SiC-Based Refractory Paints

Abstract

Refractory paints based on silicon carbide were investigated with the alkali inorganic binders. In order to optimize the β-SiC granulometric distribution, different mixture of β-SiC along with metakaolin based geopolymers were used. The alkali activator was an aqueous solution NAOH/Na2SiO3. Metakaoline dissolved and reprecipitated in alkaline condition to form geopolymer which acts like a glue to stick un-reacted Al-Si and SiC. Paints were then cured and were exposed to 900°C for 8h. In the present study various proportions of two particle size of SiC were employed and, for providing geopolymers, NaOH/Na2SiO3 as an activator and metakaolin as a raw source material were used. They were applied on the low-carbon steel substrate then characterized and compared with a monomodal of SiC up to 900°C. Due to the analysis by increasing the proportion of Nano-SiC, macrocracks has been emerged.