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Tribological investigation of silicon-modified DLC coatings for the dry forming of aluminum alloys

Abraham, Tim and Bräuer, Günter and Kretz, Felix and Groche, Peter (2016):
Tribological investigation of silicon-modified DLC coatings for the dry forming of aluminum alloys.
In: 12th International Conference THe "A" Coatings 2016, Hannover, [Conference or Workshop Item]

Abstract

Diamond-like carbon (DLC) coatings are known to reduce friction and wear. In a dry contact with steel, the tribological behavior can be further optimized by adding a certain concentration of silicon to the amorphous hydrogenated carbon coatings structure (a-C:H:Si). However, in a dry contact with aluminum, the tribological performance of a-C:H:Si coatings and the optimal silicon concentration is still unknown. In order to define an optimum regarding the silicon concentration, a-C:H:Si-coatings with different silicon contents were deposited on 1.2379 tool material by plasma-assisted chemical vapor deposition (PACVD) technology. Tribometer tests were used to analyze the friction and adhesive wear behavior against EN AW 5083 aluminum. Additionally, strip drawing tests were conducted to investigate the efficiency of the different silicon contents with a higher proximity to industrial processes. The tests showed a deteriorating friction behaviour of the a-C:H:Si coatings with an increase of the silicon concentration. Superposing wear mechanisms between the silicon and the aluminum were determined by a subsequent investigation of the wear tracks as an explanation for the tribological behaviour.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Abraham, Tim and Bräuer, Günter and Kretz, Felix and Groche, Peter
Title: Tribological investigation of silicon-modified DLC coatings for the dry forming of aluminum alloys
Language: English
Abstract:

Diamond-like carbon (DLC) coatings are known to reduce friction and wear. In a dry contact with steel, the tribological behavior can be further optimized by adding a certain concentration of silicon to the amorphous hydrogenated carbon coatings structure (a-C:H:Si). However, in a dry contact with aluminum, the tribological performance of a-C:H:Si coatings and the optimal silicon concentration is still unknown. In order to define an optimum regarding the silicon concentration, a-C:H:Si-coatings with different silicon contents were deposited on 1.2379 tool material by plasma-assisted chemical vapor deposition (PACVD) technology. Tribometer tests were used to analyze the friction and adhesive wear behavior against EN AW 5083 aluminum. Additionally, strip drawing tests were conducted to investigate the efficiency of the different silicon contents with a higher proximity to industrial processes. The tests showed a deteriorating friction behaviour of the a-C:H:Si coatings with an increase of the silicon concentration. Superposing wear mechanisms between the silicon and the aluminum were determined by a subsequent investigation of the wear tracks as an explanation for the tribological behaviour.

Volume: 3
Uncontrolled Keywords: Coatings, DLC, aluminum, wear, friction, dry forming
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institut für Produktionstechnik und Umformmaschinen (PtU)
Event Title: 12th International Conference THe "A" Coatings 2016
Event Location: Hannover
Date Deposited: 14 Apr 2016 08:21
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