coating carbide inserts

•The combination of different coating materials, each especially suitable for different applications as pointed out earlier, enlarges the universal applicability of these coatings on one hand, and improves the resistance against complex wear loads for suitable design of the coating on the other hand. •Therefore, in many cases, TiC is used as a bond layer to improve adhesion, which is supposed to take abrasive loads that softer layers could not withstand . •In contrast to that, coating materials showing diffusion inhibiting and oxidation resistant properties resulting in better resistance against cratering wear, such as TiN, ZrN, or Al2O3, are applied in outer layers of the coatings . •The transition between TiC and TiN is often realized by one or more Ti(C,N)-layers arranged in steps or with graded composition , providing a high cohesive strength of the multilayered coating structure