Picosecond laser-textured WC-10Co4Cr metal-ceramic composite coatings with high wear resistance property

The wear resistance properties of anilox roller have been a compelling challenge. A periodic array patterned WC-10Co4Cr metal-ceramic composite coatings is prepared by picosecond laser texturing. Coupled with the generation of cobalt oxide (CoO), tungsten oxide (WO3), di‑tungsten carbide (W2C), the laser processing mechanism is verified to involve the thermal vaporization of the metallic binder phase cobalt (Co), follow by the coulomb explosion removal of ceramic phase tungsten carbide (WC). The nano-hardness of the hexagonal (60°) mesh wall is maintained and even slightly increased by the synergy and competition among the formation of W2C, the removal of the metallic binder phase Co and the annealing softening of thermal effect. The prepared micro-structures on the surface which can capture debris and form stable lubricant film leads to a substantial reduction in both friction coefficient and wear rate, thereby resulting in remarkable improvements in wear resistance. In addition, the primary wear mechanism of the textured coating is found to be abrasive wear, accompanied by adhesive wear and oxidation wear. The integration of the metal-ceramic coatings and technology with laser processing enables the preparation of anilox roller with high hardness and exceptional wear resistance.