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Deposition of nanoscopically smooth DLC tool coatings for dry forming of aluminum sheets

: Abraham, Tim; Bialuch, Ingmar; Bräuer, Günter; Flegler, Felix; Groche, Peter

Volltext ()

JOM. The journal of the Minerals, Metals & Materials Society 72 (2020), Nr.7, S.2504-2510
ISSN: 0148-6608
ISSN: 1047-4838
ISSN: 1543-1851
Deutsche Forschungsgemeinschaft DFG
SPP 1676-Dry metal forming - sustainable production through dry processing in metal forming; 390892986
Functionalizing of a-C:H tool coatings and homogenization ofthe aluminium passive layer for the dry forming of aluminum
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IST ()

Recent investigations demonstrated the applicability of diamond-like carbon (DLC)-coated tools for dry forming of aluminum, which is a challenging application field due to the high adhesion tendency of aluminum. An exceptionally low roughness of the coated forming tool is required to prevent adhesion-induced tool failure. To establish dry forming of aluminum in industrial production processes, efficient methods must be developed to manufacture DLC-coated forming tools with reproducible high surface quality. This paper illustrates two DLC coating processes that are especially optimized for deposition of nanoscopically smooth DLC tool coatings. Two optimized coating systems were deposited, characterized, and subsequently evaluated using application-oriented strip drawing tests to validate their performance in comparison with a state-of-the-art coating system. One coating process showed high potential for production of DLC-coated forming tools with the required surface quality.