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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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2014-08, Vol.21 (8), p.796-805
Main Authors: Sampath Kumar, T., Balasivanandha Prabu, S., Manivasagam, Geetha, Padmanabhan, K. A.
Format: Article
Language:English
Subjects:
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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Summary: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