Structure and properties features of CA-PVD Ti-Al-Ni-N coatings deposited on carbide alloys and tool steel substrates

• Published in: Surface & coatings technology Vol. 494; p. 131348
• Main Authors: Belov, D.S., Demirov, A.P., Blinkov, I.V., Sergevnin, V.S., Chernogor, A.V., Kiryukhantsev-Korneev, P.V., Anikin, V.N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.10.2024
• Subjects: CA-PVD coating; Carbide alloys; Structure; Tensile macrostresses; Tool steel; Carbide alloys; Tensile macrostresses; CA-PVD coating; Structure; Tool steel
• ISSN: 0257-8972
• DOI: 10.1016/j.surfcoat.2024.131348

The results of studies of the properties of CA-PVD Ti-Al-Ni-N coatings deposited on widely used carbide alloys of the WC-Co, WC-TiC-Co, WC-TiC-TaC-Co groups and carbon steel are presented. It has been shown that the hardness and Young's modulus of the coatings on different substrates differ by up to 1.5 times, even though there is no significant difference in composition. The formation of globular aggregations on cell ridges, which is a characteristic feature of the morphology of coatings on steel substrates, and the presence of multilevel (stepped) structure were observed. The difference in CSR, microstrain and lattice period values for the nitride phase in the coatings on the substrates has been established. From the point of view of differences in thermal diffusivity of substrates, features of morphology and substructure of coatings are explained. The differences in the properties of coatings are also associated with the implementation of tensile macrostresses on steel in comparison with compressive stresses on carbide substrates. Tensile macrostresses and macrolayering are the reasons for the relatively low level of strength (2–3 times) of adhesion of the coating to tool steel compared to coatings on carbide substrates. At the same time, a decrease in the shear strength of the coating material on a steel substrate due to macro-layering may be the reason for the relatively low friction coefficient of this coating (~0.5) compared to coatings on a carbide base (0.69–0.53). The work provides recommendations for the most effective use of Ti-Ni-Al-N coating on carbide alloys and carbon steel. [Display omitted] •The temperatures of Ti-Al-Ni-N coatings on different substrates were calculated•Low thermal diffusivity of steel determines higher temperature in the growing coating•The coatings structure is determined by the thermal diffusivity of the substrates•The influence of structure and macrostresses on the coatings properties is shown•“Coating-substrate” interface for carbide and tool steel were studied