Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4986642 | Wear | 2017 | 14 Pages |
Abstract
Although the microhardness (â600 HV0.3) seemed rather insensitive to the composition of the coatings, their sliding wear resistance (tested under ball-on-disk configuration against corundum spheres at various temperatures) improved with increasing contents of Al2O3 and h-BN. The improvement was more significant at room temperature, but some beneficial effect also emerged when testing at 400 °C and 700 °C. Al2O3 and h-BN indeed promote the formation and enhance the mechanical stability of an oxide-based tribofilm, protecting the coating surface from direct contact with the counterbody. Specific tribofilm formation mechanisms however vary with temperature. Overall, coatings containing â¥5 wt% of Al2O3 and h-BN keep a reasonably stable wear rate (<5*10â4 mm3/(Nm)) over a wide temperature range.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
Giovanni Bolelli, Alessia Candeli, Luca Lusvarghi, Tiziano Manfredini, Alain Denoirjean, Stéphane Valette, Alice Ravaux, Erick Meillot,