Use of Duplex PVD Coatings to Increase the Life of Moulds and Cores for die Casting of Aluminium Alloys in the Automotive Industry

The paper presents the results of research aimed at increasing life moulds and cores for high-pressure aluminium casting. castings produced are intended automotive industry. Local impulse heating was applied to surface base material Uddeholm Dievar moulds. Three rates were used. After treatment, structural analysis performed. PVD coating nACRo3 treated in this way. Coating deposition performed by Larc technology. quality evaluated on basis Scratch test Mercedes test. laser treatment application coating, microgeometry according ISO 25 178. coated then immersed an Al - Si-based alloy melt a temperature 680 ± 20°C remaining 120 300 min. Experimental work has confirmed that resistance mould significantly increased.