Tribological Behaviors of DLC Films and their Application in Micro-Deep Drawability

M.D. Jeana, b, c, G.F. Liana, b, B.S. Chena aSchool of Mechanical and Automotive Engineering, FuJian University of Technology, Fujian Province, 350118, China bDigital Fujian Industrial Manufacturing IoT Lab cLaboratory of New Materials Preparation and Forming Technology, Training Facilities of Mechanical Engineering

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In this study, the surface of micro-punches is coated with a ceramic matrix composite, a graded diamond-like-carbon (DLC) film, in order to improve the micro-deep drawing formability. DLC coatings with Zr/ZrC/NZrC were prepared by magnetron sputtering. The effect of graded DLC films, such as surface textures and wear properties on the ability for the deep drawing of micro-cups based on laser diode copper alloy sheet was explored. In addition, the application of the DLC coated SKD11 substrate to the drawability was demonstrated and its applicability was explored in comparison with that of the other films such as SKD11, CrN and ZrN, and the size effect of friction on the formability of drawn circular cups is discussed according to the DLC films coated punch diameters. Experimental results showed that the graded DLC films significantly improved the surface textures and wear behaviors of the micro-punches. The DLC coated punches which dramatically decreased the stamping force and increased the drawing ratio was better than for other films, whose the drawing ratio yielded an increase of about 24% in the coated micro-punch diameter of 2.5 mm types. The applicability of the DLC films for the drawability of micro-cups was successfully demonstrated through the micro-deep drawing process. Accordingly, the DLC films prepared by magnetron sputtering are promising candidates for enhancing the drawability of micro-cups based on laser diode copper.

DOI:10.12693/APhysPolA.134.429 topics: diamond-like-carbon, micro-deep drawing, magnetron sputtering, drawability, surface texture