Investigation of the tribological performance of a­­­-C:H coating systems by modifying adhesive layer for application in dry deep drawing

Rothammer B, Zhao R, Krachenfels K, Merklein M, Tremmel S (2019)

Publication Language: English

Publication Type: Conference contribution, Conference Contribution

Publication year: 2019

Event location: Sendai

URI: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5db14676ba9fc

Abstract

Lubricants are essential in conventional deep drawing processes to improve the tribological behavior and product quality. Requirements for increasing sustainability and resource efficiency motivate the realization of lubricant-free deep drawing processes. However, the direct contact between tool and workpiece during dry deep drawing leads to increased adhesive wear and surface damage on the sheet metal. A promising approach to face these challenges due to dry deep drawing is the application of amorphous carbon coating systems on tool surfaces. The roughness peaks on the coating surface caused by deposition have to be kept as low as possible, in order to reduce the risk of abrasive wear caused by interlocking into the ductile metal sheet and thus the initial adhesive wear can be avoided. In this study, the influence of adhesive layer on the topography of a‑C:H functional layer is investigated and its tribological performance verified. The modified deposited a‑C:H coating system exhibits similar adhesion to the substrate as the standard a‑C:H coating system. In addition, it shows a more homogeneous surface topography without formation of droplets. Due to the modified adhesion layer, the R_pk value in as-deposited state is 10 times lower by changing the deposition technique of the chromium adhesive layer. As a result, the extremely low roughness peaks of the coating penetrate only slightly into the rough sheet surface with EDT texturing. The standard and modified a‑C:H coated tool surfaces against two common used aluminum alloys (AA6014, AA5182) are applied for the tribological evaluation by the flat strip drawing test. The analysis of the resulting coefficients of friction shows that the tribological behavior is directly influenced by the roughness. The roughness of the functional layer and thus the tribological behavior can be changed by the application of different adhesive layers. Furthermore, the tool and workpiece surfaces are characterized before and after the test in order to investigate wear mechanisms on tools.

Authors with CRIS profile

Related research project(s)

How to cite

APA:

Rothammer, B., Zhao, R., Krachenfels, K., Merklein, M., & Tremmel, S. (2019). Investigation of the tribological performance of a­­­-C:H coating systems by modifying adhesive layer for application in dry deep drawing. In Proceedings of the International Tribology Conference Sendai 2019. Sendai, JP.

MLA:

Rothammer, Benedict, et al. "Investigation of the tribological performance of a­­­-C:H coating systems by modifying adhesive layer for application in dry deep drawing." Proceedings of the International Tribology Conference Sendai 2019, Sendai 2019.

BibTeX: Download