The surface of a conventional sanitary ware was covered with the glaze that was a glassy phase containing silica and zircon crystals. Therefore, the surface of the glassy region was eroded selectively by using it for long time, which made a rough surface of a sanitary ware that causes adhesion of dirt on the surface. In this study, we investigated a double layer structure constituted of a conventional graze layer and a coating glass layer on the sanitary ware surface for improvement of durability and anti-contamination of the sanitary ware.
We selected seven glasses constituted of SiO
2-Al
2O
3-CaO-MgO-K
2O-Na
2O system for the coating glasses on the conventional glaze layer, and fabricated a double layer structure on a sanitary ware by firing. We also investigated the physical properties (glass transition temperature T
g, crystallization temperature T
c, liquidus temperature T
1, and viscosity of the glass melts (η)) of the coating glass were measured.
The microscopic observations of the cross-section at the interface between the graze layer and the coating glass layer showed three different mixing patterns as follows.
(1) The graze layer and the coating glass layer were completely separated.
(2) The graze layer and the coating glass layer were partially mixed.
(3) The graze layer was partially exposed to the surface of the coating glass layer.
From the results of the physical properties measurements of the coating glasses, it was found that the formation of double layer structure was controlled by the viscosity of glass melts and the thickness of the coating glass layer. Finally, we concluded that the accomplished double layer on the sanitary ware surface was suitable for improvement of durability and anti-contamination.
抄録全体を表示