Browsing by Author "Karakas, M. S."

Now showing 1 - 2 of 2

Citation - WoS: 26
Citation - Scopus: 28
Boride Layer Growth Kinetics of Aisi H13 Steel Borided With Nano-Sized Powders
(Polska Akad Nauk, Polish Acad Sciences, inst Metall & Mater Sci Pas, 2018) Kanca, E.; Yilmaz, E.; Karakas, M. S.; Gunen, A.; 01. Çankaya Üniversitesi; 06. Mühendislik Fakültesi; 06.07. Malzeme Bilimi ve Mühendisliği
Growth kinetics of boride layers in AISI H13 steel was investigated using the pack bonding method at temperatures of 1073, 1173 and 1273 K (800 degrees C, 900 degrees C and 1000 degrees C) for periods of 2, 4 and 6 h with nano-sized boron (NB) and micron-sized Ekabor II powders as bonding agents. The total thickness of the boride layer (including both FeB and Fe2B) after boriding at 1273 K (1000 degrees C) for 6 h was 103.8 gm and 96.5 mu m for the NB and Ekabor II specimens, respectively. X-ray diffraction analysis of the boride layers on the surfaces borided with NB and Ekabor II revealed the presence of FeB and Fe2B phases with sawtooth morphology. The FeB/Fe2B volume ratio was higher in the specimens borided with NB. The thickness of the boride layer (FeB + Fe2B) increased with the increasing boriding temperature and time. The FeB layer in the NB specimen displayed a (002) preferred orientation.
Citation - WoS: 1
Effect of Nickel Content on the Boronising Behaviour of Permalloys
(Scibulcom Ltd, 2015) Ucar, N.; Karakaş, Mustafa Serdar; Iyi, O.; Uçar, Nuri; Calik, A.; Karakas, M. S.; 48915; Malzeme Bilimi ve Mühendisliği; Bankacılık ve Finans; 06.07. Malzeme Bilimi ve Mühendisliği; 03.01. Bankacılık ve Finans; 03. İktisadi ve İdari Birimler Fakültesi; 06. Mühendislik Fakültesi; 01. Çankaya Üniversitesi
Permalloys with nickel contents ranging from 60 to 90% were boronised in a solid medium using the powder pack method. In this method, commercial Ekabor-II powders were thoroughly mixed with ferro-silicon powders to form the boronising medium. The samples were boronised in an electrical resistance furnace for 5 h at 1173 K under atmospheric pressure. The results showed that borosilicide and boride layers were formed on the surface of boronised permalloys, with average hardness of 900-1000 HV0.1. The average thickness of the multilayer coating was 90 mu m, and did not show significant change with Ni content within the range studied. The saw-tooth morphology of the boride layers were smoothened with increasing nickel content.