セラミックタイルの炭素被覆(3)

Abstract

Carbon coating of ceramic tiles was performed by placing the sample tile on the powder of carbon precursor poly(vinyl alcohol) (PVA) with the addition of either iron compounds, Fe_2O_3 and FeC_2O_4, or anatase-type titanium oxide. The powder of additives were placed the upper surface of the tile. During the heating to 900℃, carbon was climbed up from the lower surface of the tile and covered the particles of the additives. By adding iron compounds, brightness of the coated carbon was improved, similar to that of commercially available smoked roofing tiles. By the addition of photocatalytic TiO_2, the resultant tiles showed photoactivity to decompose methylene blue in water under UV irradiation. Carbon-coating was successfully carried out by protecting the oxidation of carbon in rice hulls, which showed the possibility to apply this process to practical production.