Computer-controlled Potentiostat / Galvanostat is capable of performing electrochemical tests such as potentiodynamic and potentiostatic polarisation, AC Impedance (EIS) and standard DC tests including LPR and
The cutting edges of milling tools reach very high tempertures, especially under dry high speed machining conditions. Tool failure may then be initiated by oxidation of the tool coating. This project seeks to gain fundamental understanding of the oxidation process of TiN, TiAlN and TiAlCrYN based hard coatings at elevated temperatures, in the range of 700-950 degrees celsius.
This award is intended to recognise outstanding research or technological innovation in the areas of interest to the Advanced Surface Engineering Division (ASED) of the American Vacuum Society (AVS) with emphasis on the fields of surface engineering, thin films and related topics.
Yashodhan Purandare, Margaret Stack and Papken Hovsepian with their plaques at the awards ceremony in San Diego, April 2005. The plaques were presented by the Conference Chairman, Dr Allan Stewart, Boeing, (pictured in the background).
The Nanotechnology Centre for Physical Vapour Deposition Research (NCPVD) is part of the Materials and Engineering Research Institute at Sheffield Hallam University. The Centre has a very successful history in the research and development of high performance functional coatings for applications in extreme environments, and of coatings for decorative applications.
MERI has facilities available for humidity testing and neutral salt spray testing to ASTM Standard B117.
The duration of testing is dependent on the samples and customer requirements and cyclic tests can also be specified, where samples are subjected to alternate wet and dry cycles. The tests are widely recognised in industry and can provide qualitative information regarding the performance of samples or can be used to rank the relative performance of a series of specimens.
High power impulse magnetron sputtering using a rotating cylindrical magnetron, W. P. Leroy, S. Mahieu, D. Depla and A. P. Ehiasarian, Journal of Vacuum Science and Technology A 28 (1), 108-111 (2010).
Wear and friction of TiAlN/VN coatings against Al2O3 in air at room and elevated temperatures, Z. Zhou, W.M. Rainforth, Q. Luo, P. Eh. Hovsepian, J.J.Ojeda, M. E. Romero-Gonsales, Acta Materialia 58 (2010) 2912-2925.
Influence of the bias voltage on the structure and mechanical performance of nanoscale multilayer CrAlYN/CrN physical vapour deposition coatings, G. Safran, C. Reinhard, A. P. Ehiasarian, P. B. Barna, L. Szekely, O. Geszti and P. E. Hovsepian, Journal of Vacuum Science and Technology A 27 (2), 174-182 (2009).
Novel TiAlCN/VCN Nanoscale Multilayer PVD Coatings Deposited by the Combined High Power Impulse Magnetron Sputtering / Unbalanced Magnetron Sputtering, (HIPIMS/UBM) Technology, P. Eh. Hovsepian, A.P. Ehiasarian, A. Deeming, C. Schimpf, Vacuum 82 (2008) 1312-1317
Deposition of Nanoscale Multilayer CrN/NbN Physical Vapour Deposition Coatings by High Power Impulse Magnetron Sputtering, Y. P. Purandare,_A. P. Ehiasarian, and P. Eh. Hovsepian, J. Vac. Sci. Technol. A 26, 2, Mar/Apr 2008, p 288-296.