Similarly, the composite coating S2 was also experimented in the friction study. Fig.1(a) exhibits the curves of worn volume loss vs. load of three materials. It is found that the worn volumeloss increases with applied load ranging from 10 to 75 kg in all specimens. Moreover, the worn volume loss of the composite coat-ing keeps slightly increasing with a continuous increase of loads, whereas those of the M2 and Al2O3 under the same experimental conditions present a considerable moving-up trend. In particular, the composite coating shows better wear resistance under higher load conditions(≥50 kg), and the worn volume loss of M2 and Al203 coatings at 75kg is approximately 2.2 and 1.7 times higher than that of the composite coating, respectively. From the curves of friction coefficient vs. load(Fig.1(b)), the friction coefficient of M2 steel retains a constant of approximately 0.37. In contrast, those of Al2O3 and composite coatings represent a slow drop-down movement. But the friction coefficient of the composite coating is slightly higher than that of M2 steel when load<50kg, while the friction coefficient of the composite coating at a higher load of 75 kg falls down to 0.33 lower than that of M2 steel. Therefore, the composite coating exhibits better anti-friction property under severe conditions.
Fig.8. Frictional curves of (a) worn volume loss vs. load and(b) friction coefficient vs. load on M2 steel, Al2O3 coating and composite coating S2.
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