CrAlYN/CrN superlattice coatings deposited by the combined high power impulse magnetron sputtering/unbalanced magnetron sputtering technique

HOVSEPIAN, P. E., REINHARD, C. and EHIASARIAN, A. P. (2006). CrAlYN/CrN superlattice coatings deposited by the combined high power impulse magnetron sputtering/unbalanced magnetron sputtering technique. Surface and Coatings Technology, 201 (7), 4105-4110.

Full text not available from this repository.
Link to published version:: https://doi.org/10.1016/j.surfcoat.2006.08.027

Abstract

CrAlYN/CrN coatings represent a new generation Ti-free PVD coatings tailored to serve high temperature applications such as dry high speed machining and protection of special grades aerospace and automotive alloys against environmental attack. The novel High Power Impulse Magnetron Sputtering (HIPIMS) technique was used for substrate pre-treatment (etching) followed by coating deposition utilising Unbalanced Magnetron Sputtering (UBM). The employment of HIPIMS resulted in smooth (R-a = 0.036 mu m) and well adherent films with typical scratch adhesion critical load values on M2 high speed steel of L-C = 65 N. Low-angle XRD analysis showed that the coating has a nanoscale multilayer (superlattice) structure with a typical bi-layer thickness of 4 nm. XTEM observations confirmed this result and further revealed the dense, growth defect free structure of the coating due to the HIPIMS etching. CrAlYN/CrN combines high hardness of HK0.025 = 3320 with a low coefficient of friction of 0.5 and an exceptionally low sliding wear coefficient of 3.7 x 10(-17) m(3) N-1 m(-2), which is comparable to that of TiAlN/VN and Me-Carbon films. In dry high speed milling (V-cutting = 385 m min(-1)) of hardened A2 tool steel (HRC = 58), 8 min cemented carbide ball nosed end mills coated with CrAlYN/CrN outperformed TiAlCrYN, which is one of the market leading coatings dedicated to this application. When the test is carried out at the higher end of the cutting speed range of 500 m min(-1) this difference in performance becomes even more pronounced (factor of 8 longer life time), which demonstrates the excellent quality of CrAlYN/CrN. ((c))2006 Elsevier B.V All rights reserved.

Item Type: Article
Additional Information: 33rd International Conference on Metallurgical Coatings and Thin Films MAY 01-05, 2006 San Diego, CA
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Nanotechnology Centre for PVD Research
Identification Number: https://doi.org/10.1016/j.surfcoat.2006.08.027
Page Range: 4105-4110
Depositing User: Ann Betterton
Date Deposited: 16 Feb 2010 14:00
Last Modified: 18 Mar 2021 21:30
URI: https://shura.shu.ac.uk/id/eprint/1122

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics