Contact Behavior of Composite CrTiSiN Coated Dies in Compressing of Mg Alloy Sheets under High Pressure

Abstract

Hard coatings have been adopted in cutting and forming applications for nearly two decades. The major purpose of using hard coatings is to reduce the friction coefficient between contact surfaces, to increase strength, toughness and anti-wear performance of working tools and molds, and then to obtain a smooth work surface and an increase in service life of tools and molds. In this report, we deposited a composite CrTiSiN hard coating, and a traditional single-layered TiAlN coating as a reference. Then, the coatings were comparatively studied by a series of tests. A field emission SEM was used to characterize the microstructure. Hardness was measured using a nano-indentation tester. Adhesion of coatings was evaluated using a Rockwell C hardness indentation tester. A pin-on-disk wear tester with WC balls as sliding counterparts was used to determine the wear properties. A self-designed compression and friction tester, by combining a Universal Testing Machine and a wear tester, was used to evaluate the contact behavior of composite CrTiSiN coated dies in compressing of Mg alloy sheets under high pressure. The results indicated that the hardness of composite CrTiSiN coating was lower than that of the TiAlN coating. However, the CrTiSiN coating showed better anti-wear performance. The CrTiSiN coated dies achieved smooth surfaces on the Mg alloy sheet in the compressing test and lower friction coefficient in the friction test, as compared with the TiAlN coating.

Coating Material Development by Pulsed Laser Deposition for JIS SKD61 Steel Insert Pins Used in Aluminum Casting Industry

“…Scholars have been intrigued by current research and uses of superconductive materials, prompting them to investigate their potential usage for protective coatings (Yang et al, 2018;Willmann et al, 2008). Furthermore, the aluminum casting industry has seen an increase in the demand for protective layers to deal with die soldering.…”

Effect of Laser Heating on the Life of Cutting Tools Coated with Single- and Multilayer Coatings Containing a TiN Layer

“…The selection of a coating material in terms of its chemical composition, hardness, high melting point, brittle fracture resistance, proper coating structure, and friction coefficient is not enough for the coating deposited on a cutting blade to effectively perform its anti-wear function. In addition to the above, it is also necessary to ensure that the coating has a sufficiently high adhesion to the substrate [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. The coating with required mechanical properties becomes useless if its adhesion to the substrate is insufficient.…”