Friction and Wear Properties of Cold Gas Dynamic Sprayed 𝛼-Al₂O₃-Al Composite Coatings

Figure 5

SEM observation of the lightly etched cross-sectional samples of (a), (b), and (c) and surface samples of (d), (e), and (f) for pure Al coating, coating25, and coating50, respectively.

(a)

(b)

(c)

(d)

(e)

(f)