Prof. Dr. Enikő Bitay
Sapientia Hungarian University of Transylvania, Faculty of Technical and Human Sciences, Department of Mechanical Engineering
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Academic Career Length
30Years (1997-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 January 2019 in Express Polymer Letters
Journal Article
EHEdit Hirsch
Edit HirschPVP. Vass
P. VassBDBalázs Démuth
Balázs DémuthZPZs. Petho
Zs. Petho
Enikő BitayGMGy. Marosi
Gy. Marosi
+5
13 December 2019 in Journal of Applied Polymer Science
Journal Article
ZKZoltán Kiss
Zoltán KissTTTamás Temesi
Tamás TemesiEnikő Bitay
Tamás BárányTCTibor Czigany
Tibor CziganyIn this study, the mechanical properties of ultrasonic welded lap joints of all‐polypropylene composite (APPC) were investigated and compared to the interlaminar properties of the composite sheet itself. The process control parameter was welding time: welded samples were prepared with an ultrasonic welding machine in the 0.1–1.0 second time range. In most cases, the shear strength of the welded samples exceeded that of the unwelded APPC. Although it was found that during the ultrasonic welding process, the reinforcing tapes partially melted in the welding zone (WZ), the seam remained strong enough because the heat released and the pressure applied during the welding process further improved the consolidation of the APPC layers. © 2019 The Authors. Journal of Applied Polymer Science published by Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48799.
1 October 2019 in IOP Conference Series: Materials Science and Engineering
Conference Paper
Tünde Anna KovácsUMUmesh Mhatre
Umesh Mhatre
Zoltán NyikesEnikő BitayThe surface modification is a suitable technology to increase the surface wear resistance of steels. In this way, the used substrate metal can be a low alloyed, cost-effective chemical composition steel. After the substrate metal heat treating, hardening and annealing, it needs surface modification. It well knew some surface heat treating technologies, like carburizing, nitridation, nitrocarburizing, and surface quenching. The surface coating is also very useful technologies when by the chemical or physical process it built a new layer on the surface. In this work, we compare different modification processes results made by the way of the traditional and new technologies advantages. The chemical composition and the structure determine the surface mechanically and wear resistance properties. The available chemical composition determines the surface modification technology [1-3]. It was prepared with different surface layers on the same substrate steel by a different process and inspected by different testing methods. On the base of the tests results needs to specification a new surface modification process for the high-level surface resistance layer.
Journal Article
Enikő Bitay
László TÓTH
Tünde Anna KovácsZoltán Nyikes
Attila Levente GergelyIt is desirable to improve tool steel wear resistance to produce pieces with precise dimensions and increase the lifetime of tools. The aim of this work was to modify the surface of 1.2344 (X40CrMoV5-1) hot work tool steel to improve the wear properties. Surface modification was achieved in three steps: first, hardening was applied, followed by plasma nitridation and, finally, physical vapor deposition (PVD) was employed to produce a TiN/AlTiN multilayer coating. The microhardness and the wear coefficient of the surfaces were measured. PVD coating showed the highest hardness value, 2938 HV0.01, whereas plasma nitridation followed by PVD resulted in 2679 HV0.01. The surface modification resulted in an increase in surface roughness in all cases compared to the hardened sample. However, the wear coefficient showed a significant decrease for the surface treated samples. The lowest wear coefficient of K = 1.47 × 10−10 mm3/Nm, which is a magnitude lower than the reference hardened sample (K = 6.32 × 10−9 mm3/Nm), was achieved employing both plasma nitridation and PVD. The results confirm that the use of a combined surface modification of plasma nitridation and PVD significantly improve the wear resistance of the treated samples.
1 January 2021 in Express Polymer Letters
Journal Article
Enikő BitayAttila Levente GergelyIBI. Balint
I. Balint
KMK. Molnar
K. Molnar
IFI. Fulop
I. Fulop
ZSZ. I. Szabo
Z. I. Szabo
+1
Journal Article
Enikő BitayIKIrina E. Kacsó
Irina E. KacsóCTClaudiu Tănăselia
Claudiu TănăseliaDTDana Toloman
Dana TolomanGBGheorghe Borodi
Gheorghe BorodiEVErzsébet Veress
Erzsébet Veress +2
Iron slag samples unearthed from archaeological sites lying on the Eastern limes sector of Roman Dacia (the Brâncoveneşti and Călugăreni auxiliary forts and the Vătava watchtower) were studied in order to assess the probability of local iron working (smelting and smithing) during the 2nd–3rd centuries CE. Structural-mineralogic aspects revealed by PXRD analysis and FTIR spectroscopy indicate different slag types corresponding to different iron production and processing stages allowing the supposition that refining of the bloom and processing of the refined iron took place on the sites. The FTIR absorption bands obtained in the spectral domain 2000–400 cm−1 show that mineralogically the samples are constituted mainly of silicates associated with minor quantities of aluminates and carbonates. The fayalite, haematite, and magnetite phases appearing on both the X-ray diffractograms and the FTIR spectra agree with the redox conditions of the slag formation process which result from the Fe3+/Fe2+ ratio determined using the EPR-method. The bulk macro-elemental PXRF and ICP-MS spectroscopy data support the slag typization proposed on the basis of the probable working conditions; trace-elemental bulk composition suggests that the provenance of the raw materials may be different.
About Me
Enikő BITAY
Engineer-informatician, academician, external member of the Hungarian Academy of Sciences, habilitated Professor of the Sapientia Hungarian University of Transylvania (http://www.ms.sapientia.ro/), Research Professor at the University of Óbuda (https://bgk.uni-obuda.hu/) founding member and President of the Transylvanian Museum Society (EME, http://www.eme.ro/), honorary member of the Hungarian Academy of Engineers (http://www.mernokakademia.hu/).
Professor at the Sapientia Hungarian University of Transylvania’s Faculty of Technical and Human Sciences, Department of Mechanical Engineering. She teaches Material Science and Engineering, Materials Technology and Engineering of Modern Materials.
His research includes the investigation of the geometry of cellular materials, laser surface treatment and simulation, laser processing of special biomaterials, development of electro-fibre formation technologies, production of nanofibre solid dispersions, production of aluminium matrix composites. Leader of interdisciplinary research.
President scientific: Committee of International Scientific Conference of Young Engineers (FMTÜ); member Committee for Materials Science and Technology of Hungarian Academy of Sciences.
Editor-in-Chief of the Journals: MTK, https://eme.ro/publication/mtk/mtk-main.htm and Acta Materialia Transylvanica, https://eme.ro/publication/acta-mat/mat-main.htm.
Founder and project manager of the Transylvanian Digital Database (EDA, http://eda.eme.ro/).