The process of contact melting in iron-carbon systems was investigated using a dilatometric method. Specimens of iron, and diamond or graphite of various structures were studied at different temperatures and pressures. The thickness of the layer of eutectic melt formed and removed from the interface of contact was measured. The experimental data were analyzed and the process mechanism discussed.The processes of contact melting in the iron-diamond and iron-graphite systems have not been sufficiently investigated. It has been determined by study of the systems of graphite and diamond with metals of the iron triad (iron, cobalt, nickel) [1] that the temperatures of contact eutectic melting in the metal-graphite and metal-diamond systems coincide with those appearing in the metal-carbon phase diagrams; differences between systems with graphite and with diamond do not appear. In studies of contact melting in the systems diamond-iron(/) and graphite-iron(/) [2, 3], an obvious dependence of solid-phase wetting on the time and temperature of the experiment, and concentration of.carbon in the liquid phase, has been observed. This is connected with rapid solution of carbon in the metal, which decreases the difference in chemical potentials of carbon in the liquid and solid phases, and leads to impairment of wettability.The objective of the present investigation was to study the kinetics of contact melting in the iron-diamond and iron-graphite systems near the eutectic temperature. It was proposed to determine the rate of contact melting as a function of temperature, structure of the carbonaceous material -diamond, graphite (grade ARV-2M, pyrographite, glassy carbon SU-2000) --and to clarify the mechanism of the process.The dimensions of the specimens of contacting pairs Fes-C s in the apparatus (Fig. 1) were measured in the course of the experiment with the aid of the dilatometer shown in [4]. The initial materials were carbonyl iron powder, native monocrystalline diamond (natural (111) facets), glassy carbon SU-2000, pyrographite (along and perpendicular to the plane of deposition), and graphite ARV-2M.Iron specimens 4 mm in diameter and 2 mm in height were prepared from carbonyl iron remelted in an arc furnace, and poured into a chill mold. In order to obtain specimens 2 rnm in diameter and 2 mm high, preliminarily compa(ted powders ofcarbonyl ironwere remelted in a vacuum furnace at 1600°C, and filled into aluminum oxide capillaries 2 ram in diameter and 100 mm long. Theglassy carbonand graphite components of the contacting pairs were 6.5 mm in diameter and 2 mm high. The dimensions of the pyrographite specimens with surfaces perpendicular to the plane of deposition were 5 × 5 × 5.5 mm.The structure of the experimental cell is shown in Fig. 2. The contacting pair, consisting of iron specimens 1 and carbonaceous material 2, is placed in an aluminum oxide crucible 3; the movable aluminum oxide rod 4 of the dilatometer is installed from above under a constant load for removal of liquid phase (if it should form) from the ...
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