Foaming inhibition of SiC-containing porcelain ceramics by using Si powders during sintering

Porcelain green bodies were prepared using porcelain stoneware tile powder as the major raw material, with silicon carbide (SiC) and Si powders as additives. These were fired at 1000-1200 °C. The effects of Si powder addition on the microstructure, crystalline phases, and relative density of SiC-containing porcelain bodies were systematically investigated, and the related mechanism was also discussed in detail. The results show that even with the addition of a small amount of Si powder, the foaming degree of the porcelain bodies containing SiC with particle size and content in a wide range can be effectively inhibited. In particular, this effect becomes more pronounced as the Si powder particle size is reduced. It is believed that this work will have important scientific value for the oxidation protection of SiC and the foaming inhibition during the direct recycling of large amounts of polishing porcelain tile residues in the world.