Abstract
Adhesive strength of the coating significantly affects the lifetime of the coating. However, it is still inevitable for the coating, even with strong adhesive strength, to peel off from the substrate after working for a while. In this work, fatigue and wear behaviors were employed to analyze the effect on the mechanics of coating and contribute to a fundamental understanding of peeling of the coating. A small-size Co-cemented tungsten carbide drill bit was selected as the examined substrate to fabricate the diamond coating. Roughening pretreatment with a diamond slurry combined with ultrasonic vibration was performed for the substrate surface to enhance adhesive strength. Meanwhile, a diamond coating without roughening pretreatment was also fabricated for comparison. The lifetime and quality of the coating were evaluated by the drilling test. Although the diamond coating could grow on the substrates with and without roughening pretreatment, the diamond coating with roughening pretreatment possessed a higher lifetime and stronger wear resistance than that without roughening pretreatment. We found that both substrates with and without roughening pretreatment exhibited a coarse surface, whereas the roughening pretreatment could remove the original machined surface of the substrate and thus make the near surface with numerous integrated crystalline grains become the new topmost surface. This increased the contact area and surface energy of the interface, leading to the improvement of adhesive strength. Finally, fatigue strength and contact mechanics were studied to trace the changes in the stress of the diamond coating in the whole process of drilling from a theoretical point of view. We suggest that fatigue strength and contact mechanics may play vital roles on the durability and peeling of the coating.
Highlights
To date, diamond is regarded as the hardest material in the world, which has attracted the intensive attention of scholars and engineers to adopt it as a protective coating in industrial fields [1,2,3,4].Due to the difference in lattice parameters and coefficients of linear expansion between the substrate and coating, the structure of the coating/substrate interface is very complex and the interface shows a relatively weaker strength than the bulk materials, which leads to the most frequent occurrence of the peeling of the coating
Microcrystalline diamond (MCD) coating with roughening pretreatment is called the roughening pretreatment pretreatment microcrystalline microcrystallinediamond diamond (RMCD) coating
For micro-sized and complex shape substrates, different pretreatments are performed to prolong the lifetime of the as-deposited coating, which is the emphasis in industrial fields
Summary
Due to the difference in lattice parameters and coefficients of linear expansion between the substrate and coating, the structure of the coating/substrate interface is very complex and the interface shows a relatively weaker strength than the bulk materials, which leads to the most frequent occurrence of the peeling of the coating. It is still a considerable challenge for the diamond coating to avoid peeling because the diamond/substrate adhesive strength is not strong enough to undergo the external load [5,6]. Not all materials can be used as substrates on which to deposit a diamond coating Several materials such as Co-cemented tungsten carbide (WC–Co), silicon nitride, silicon carbide, silicon, etc. Several materials such as Co-cemented tungsten carbide (WC–Co), silicon nitride, silicon carbide, silicon, etc. could grow the diamond grains by the chemical vapor deposition (CVD) method [8,9]
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