ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Chemical and phase compositions of boride layers grown on steel bases in molten-salts

M. Chrenková-Paučírová, P. Fellner, K. Matiašovský, and J. Krištín

Institute of Inorganic Chemistry, Centre for Chemical Research, Slovak Academy of Sciences, CS-842 36 Bratislava

Abstract: The influence of utilized bonding method, of the operating conditions and composition of the base (substrate) on the chemical and phase compositions of boride layers formed by the electrolytic and thermochemical bonding of steels in molten salts has been investigated. As substrates, the low-alloy low carbon steel, the manganese steel, and the high-alloy chromium steel have been tested. The boride layer formed by the electrolytic bonding consists of two phases, FeB and Fe₂B. In the thermochemical bonding, the phase composition of the boride layer depends on the composition of the bonding mixture and opera­tional conditions, and the formation of the FeB phase can be partially or entirely suppressed. It was also found that' under certain conditions an additional phase with chemical composition corresponding to the compound Fe₃B is formed. When the boride layer was grown on a high-alloyed chromium steel it was found that Cr forms a diffusion barrier which slows down the rate of the boride layer formation and increases the content of the FeB phase.

Full paper in Portable Document Format: 402a153.pdf

Chemical Papers 40 (2) 153–166 (1986)