Relationship between Surface Abrasion Wear and Brightness in Glazed Porcelainized Stoneware Tiles
Figure 3
OM micrographs (top views) of samples scratched by topaz: (a) bright glazed surface without the protective layer; (b), (c) and (d) bright glazed surfaces coated with the protective layer (half-spherical dots), P20C composition deposited in half-sphere geometry. Not etched. Magnification: 5x.