Results 171 to 180 of about 4,115 (221)

Boriding iron and steel in vacuum

Metal Science and Heat Treatment, 1964
1. It was shown possible to boride iron and steel in vacuum in a mixture of boron carbide and borax. The thickest diffusion layer forms by impregnating in a mixture containing 16–18% borax. 2. The influence of temperature and process time on the thickness and structure of the diffusion layer was studied.
G. M. Zemskov, N. G. Kaidash, L. L. Praven'kaya   +2 more
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Eutectic-containing iron-boride materials (EIBM)

Soviet Powder Metallurgy and Metal Ceramics, 1974
1. A study was made of the mechanical properties of eutectic-containing iron-boride materials (EIBM) produced by the infiltration technique. 2. It was established that EIBM can be strengthened by quenching them from a temperature at which their eutectics are in a liquid state. 3.
A. K. Mashkov, V. V. Chernienko
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High boron phases on borided iron and iron alloys

Journal of Materials Science Letters, 1985
Examen par spectroscopie Mossbauer pour approfondir les resultats de diffraction X sur du fer Armco borure pendant 15 h a 850 C par un melange de B 4 C contenant 20% de poudre de SiC et active par KBF 4 (2,5%). Mise en evidence d'une phase FeB x et d'une phase (B,Fe) ss amorphe ou tres finement dispersee.
G. Palombarini, M. Carbucicchio
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Mechanism of thermochemical growth of iron borides on iron

Journal of Materials Science, 2004
The mechanism of thermochemical growth of iron borides on iron was studied by analysing the products which form on samples placed in contact with B4C-base powder mixtures with different boronising potential. The analyses were carried out by means of metallographic and X-ray diffraction techniques.
MARTINI, CARLA, PALOMBARINI, GIUSEPPE, CARBUCICCHIO M.   +2 more
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Diffusion Method of Steel Boriding Without Formation of Iron Borides

2018
A new method of strengthening of steel surfaces based on the diffusion saturation of surface layers by boron atoms is proposed. In contrast to the known method of chemical heat treatment (CHT), where boriding of the steel surface is carried out at high temperatures, in this case the surface is treated at temperatures below 800 °C. The advantage of this
Yuri F. Migal, Vladimir I. Kolesnikov
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Kinetic Analysis of Pack-Borided Gray Cast Iron

Materials Performance and Characterization, 2021
ABSTRACT In this work, a gray cast iron containing copper of grade EN-GJL-250 was pack-borided within the temperature range of 800°C–1,000°C with treatment times of 2–6 h. According to the X-ray diffraction analysis, the Fe2B phase has been identified over the surface of this material and the boride layer has an average thickness between
O. Azouani, M. Keddam, O. Allaoui, A. Sehisseh   +3 more
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Role of copper in iron–iron boride cermets

Journal of Materials Processing Technology, 2001
Abstract Multiphase sintering of an iron, copper and boron powder mixture of a concentration of 5–15 wt.% of copper and 9 wt.% of boron has been analysed. It was found that an addition of copper to a powder mixture allows full control of the quantity of liquid phase during the sintering by the mass concentration of Cu. Structure and properties of the
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The mechanism of reaction sintering of iron-iron boride cermets

Journal of Materials Science, 1993
The process of reaction sintering of iron and boron in a vacuum has been analysed, as a result of which iron-iron boride cermets have been produced. They constitute a composite material in which iron boride, Fe2B, with a hardness of about 1800 HV plays the role of the reinforcement, while iron-iron boride, Fe-Fe2B, with a hardness of about 500 HV plays
J. Nowacki, L. Klimek
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Hard boride coating on iron aluminide (FeAl)

Surface and Coatings Technology, 2008
Abstract The mechanical properties of borided iron aluminide (FeAl) were investigated. Boronizing was carried out in a solid medium consisting of Ekabor powders at 940 °C for 2, 4 and 8 h. The formation of FeB on the surface of FeAl was confirmed by XRD analysis. Metallographic studies revealed an almost saw-tooth-like and compact boride layer on the
Erdinç Ekmekçiler, Aytekin Polat, Metin Usta   +2 more
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Electrochemical boriding of iron in molten salts

Electrochimica Acta, 1991
Boride coatings on iron subtrates are obtained by electrodepositions in Na2B4O7 melts at various temperatures (from 900 to 1050°C). The effects on thickness and morphology of the electrolysis parameters (current density and time) are presented. In particular results at high current density(up to 112 A dm−2 are shown.
Segers, Luc, Fontana, André, Winand, René   +2 more
openaire   +1 more source