TiAlN/TiAlZrN multilayered hard coatings for enhanced performance of HSS drilling tools

Alternate TiAlN/TiAlZrN multilayered hard coatings with bilayer periods ranging from 6.7 to 600 nm were prepared by cathodic arc method on steel substrates and 8 mm HSS drills. The elemental composition of the composing layers was determined. A thoroughly investigation of the characteristics of mult...

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Bibliographic Details
Published in:Surface & coatings technology 2010-03, Vol.204 (12), p.1925-1928
Main Authors: Braic, V., Zoita, C.N., Balaceanu, M., Kiss, A., Vladescu, A., Popescu, A., Braic, M.
Format: Article
Language:English
Subjects:
Applied sciences
Coatings
Cross-disciplinary physics: materials science
rheology
Drilling
Dry drilling performance
Drying
Exact sciences and technology
Hard surfacing
High speed tool steels
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructural and mechanical characteristics
Multilayers
Physics
Production techniques
Superlattice coatings
Surface treatment
Surface treatments
Texture
TiAlN/TiAlZrN
Titanium aluminum nitride
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Summary:Alternate TiAlN/TiAlZrN multilayered hard coatings with bilayer periods ranging from 6.7 to 600 nm were prepared by cathodic arc method on steel substrates and 8 mm HSS drills. The elemental composition of the composing layers was determined. A thoroughly investigation of the characteristics of multilayers and of the TiN, TiAlN and TiAlZrN single layer coatings was done, concerning the phase composition, texture, microhardness, adhesion and dry drilling performance. The highest microhardness values, of about 49 GPa, were measured for the multilayers with Λ ≈ 13 nm, while the coatings with large Λ values (~ 600 nm) were found to have the best adhesion (critical load L c = 63 N). The dry drilling tests revealed that the nanometer scale multilayered TiAlN/TiAlZrN coatings exhibited superior drilling performance as compared with commonly used single layer coatings (TiN, TiAlN).
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2009.08.011