Pack-Boriding of Pure Iron with Powder Mixtures Containing ZrB 2

• Published in: High temperature materials and processes Vol. 38; no. 2019; pp. 342 - 346
• Main Authors: Calik, A., Ucar, N., Karakas, M.S., Tanis, H.
• Format: Journal Article
• Language: English
• Published: Berlin Walter de Gruyter GmbH 25.02.2019
• Subjects: Boriding; Electric resistance furnaces; Iron; Microhardness; Morphology; Optical microscopy; Thickness; Weight
• ISSN: 0334-6455; 2191-0324
• DOI: 10.1515/htmp-2017-0081

Abstract Boriding of pure iron was investigated using the powder pack method with boriding powder mixtures containing different weight fractions of ZrB 2 (5 %, 10 %, 15 % and 20 %). The samples were borided in an electric resistance furnace for an exposure time of 4 h at 1,173 K temperature under atmospheric pressure. Borided samples were characterized by optical microscopy, X-ray diffraction analyses and microhardness tests. Results showed that the boride layers consisted mainly of FeB and Fe 2 B phases. No significant difference in boride layer thicknesses (average 140 μm) could be observed as a function of ZrB 2 content. The needle-like morphology of the boride layer became more prominent with increasing weight fraction of ZrB 2 in the boriding powders. The average microhardness of the boride layer decreased with increasing ZrB 2 content due to changes in the morphology of the boride layer.