Development of novel microwave-safe platinum decoration: Functionalization of decorative layer based on the composition design of resinate

Metal decorations with gold- and platinum-like colors are widely used in ceramic products, particularly in the Western tableware industry. Tableware is typically decorated with thin metal films formed by the thermal decomposition of organometallic compounds called resinate. To be microwave-safe, decorative metal films should be insulated by forming an island-like structure of the metals; however, this often causes the loss of desired properties, such as elegant coloration and chemical durability. In this study, a platinum-colored decorative material was developed with a platinum-like color, sufficient alkali resistance, and microwavable insulation properties. The Pt-rich component is the key factor in achieving the insulated layer of which color is compatible with the non-insulated layer formed from Au-based resinate mixture for a standard platinum color. It was found that the addition of Rh resinate improved the coloration by suppressing the sintering of Pt particles. Zr was effective in improving the alkali resistance of the decorative thin films by depositing its oxide crystals in its glass matrix. It was found that a suitable design for the thermal decomposition procedure of the resinate has the potential to control the composition and structure of the metal films, which is useful for decorating tableware and as a method for creating functional films.