Scanning electron microscopy images of the wear tracks at room temperature for (a) NiCoCrAl-30 wt% tungsten carbide-1 wt% lanthanum oxide (b) NiCoCrAl-30 wt% tungsten carbide-2 wt% lanthanum oxide (c) NiCoCrAl-30 wt% tungsten carbide-3 wt% lanthanum oxide (d) NiCoCrAl-30 wt% tungsten carbide-4 wt% lanthanum oxide (e) NiCoCrAl-30 wt% tungsten carbide and (f) NiCoCrAl coatings.

Contexts in source publication

Context 1

... with 1 wt% lanthanum oxide, the coefficient of friction increases in the last 50 m of the sliding distance, which could be due to the detachment of the reinforced particles, which further affects the wear process (Fig. 8). The detachment of the reinforced particles can be observed. The grooves on the worn surface are indicative of abrasive wear, Fig. 9. When coated with 2 wt% lanthanum oxide, the increase in hardness reduces the width of the wear marks, Fig. 9b 37) . Lamellar removal of debris from the worn surface can also be seen, Fig. 9f. Some explanations have been proposed, e.g. that the compressive stress at the surface causes the cracking by plastic shear deformation under the ...

Context 2

... the wear process (Fig. 8). The detachment of the reinforced particles can be observed. The grooves on the worn surface are indicative of abrasive wear, Fig. 9. When coated with 2 wt% lanthanum oxide, the increase in hardness reduces the width of the wear marks, Fig. 9b 37) . Lamellar removal of debris from the worn surface can also be seen, Fig. 9f. Some explanations have been proposed, e.g. that the compressive stress at the surface causes the cracking by plastic shear deformation under the worn surface 38) . However, it appears that the dislocation aggregations in the wear substrate are more acceptable to the alloy coating without reinforced particles. Accordingly, the ...