Relationship between Surface Abrasion Wear and Brightness in Glazed Porcelainized Stoneware Tiles

Figure 5

OM micrographs (top views) of bright glazed surfaces coated with the protective layer, P20C composition deposited in half-sphere geometry, after 𝑁 cycles of abrasion: (a) 150 cycles, (b) 300 cycles, (c) 800 cycles, (d) 2,000 cycles, (e) 4,000 cycles, and (f) 6,000 cycles. Magnification: 20x. Not etched.

(a)

(b)

(c)

(d)

(e)

(f)