Reactions of various ceramic materials with cobalt sulfate solution

초록

In this study, a cobalt sulfate ceramic coating was sintered on various clays at 1250 °C. The specimen characteristics were investigated by X-ray diffraction(XRD), scanning electron microscopy(SEM), TG-DTA, UV-vis spectrophotometer, and HRDPM. The ceramic coating had a constant thickness of thousands μm, and the surface was confirmed to be densely fused. Other new compounds were produced by the cobalt sulfate sintering process and reactions. These compounds were a CoAl<inf>2</inf>O<inf>4</inf> phase, Co<inf>2</inf>SiO<inf>4</inf> phase,anorthite(CaAl2Si2O8) phase, and FeAl<inf>2</inf>O<inf>4</inf> phase, respectively. UV properties of the coated specimen were investigated, celadon clay specimen in 530-550 nm band is showing a dark gray color. The white clay and white mix clay specimen in 460-500 nm band is showing a blue color. The cobalt-aluminate(CoAl<inf>2</inf>O<inf>4</inf>) spinel and the cobalt-silicate olivine(Co<inf>2</inf>SiO<inf>4</inf>) were the strongest of the ceramic pigments, producing a very pure, navy blue color. © Materials Research Society of Korea.

키워드