Comparison of TiAlN, AlCrN, and AlCrN/TiAlN coatings for cutting-tool applications

Monolayer and bilayer coatings of TiAlN, AlCrN, and AlCrN/TiAlN were deposited onto tungsten carbide inserts using the plasma enhanced physical vapor deposition process. The microstructures of the coatings were characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM)....

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Veröffentlicht in:	International journal of minerals, metallurgy and materials metallurgy and materials, 2014-08, Vol.21 (8), p.796-805
Hauptverfasser:	Sampath Kumar, T., Balasivanandha Prabu, S., Manivasagam, Geetha, Padmanabhan, K. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Atomic force microscopy Bilayers Ceramics Characterization and Evaluation of Materials Chemistry and Materials Science Coatings Composites Corrosion and Coatings Droplets Glass Hardness Inserts Materials Science Metallic Materials Metallurgy Modulus of elasticity Nanoindentation Natural Materials Photomicrographs Physical vapor deposition Scanning electron microscopy Scratch resistance Surfaces and Interfaces Thin Films Titanium aluminum nitride Tribology Tungsten Tungsten carbide X-ray diffraction
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Beschreibung
Zusammenfassung:	Monolayer and bilayer coatings of TiAlN, AlCrN, and AlCrN/TiAlN were deposited onto tungsten carbide inserts using the plasma enhanced physical vapor deposition process. The microstructures of the coatings were characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The SEM micrographs revealed that the AlCrN and AlCrN/TiAlN coatings were uniform and highly dense and contained only a limited number of microvoids. The TiAlN coating was non-uniform and highly porous and contained more micro droplets. The hardness and scratch resistance of the specimens were measured using a nanoindentation tester and scratch tester, respectively. Different phases formed in the coatings were analyzed by X-ray diffraction (XRD). The AlCrN/TiAlN coating exhibited a higher hardness (32.75 GPa), a higher Young’s modulus (561.97 GPa), and superior scratch resistance ( L CN = 46 N) compared to conventional coatings such as TiAlN, AlCrN, and TiN.
ISSN:	1674-4799 1869-103X
DOI:	10.1007/s12613-014-0973-y