Melting diagram of cobalt-rich alloys in the system C–Co–Nb | Zendy

G. D. Dmitrieva | Zendy; Tetyana Cherepova | Zendy

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Melting diagram of cobalt-rich alloys in the system C–Co–Nb

Author(s) -

G. D. Dmitrieva,

Tetyana Cherepova

Publication year - 2015

Publication title -

chemistry of metals and alloys

Language(s) - English

Resource type - Journals

eISSN - 1998-8087

pISSN - 1998-8079

DOI - 10.30970/cma8.0309

Subject(s) - liquidus , eutectic system , cobalt , solidus , phase diagram , niobium , isothermal process , materials science , carbide , carbon fibers , metallurgy , thermodynamics , phase (matter) , analytical chemistry (journal) , chemistry , microstructure , alloy , composite material , organic chemistry , physics , chromatography , composite number

The melting diagram of cobalt containing up to 3 wt .% C and 40 wt.% Nb was investigated and the liquid us and solidus projections were determined. Alloys wer e prepared by arc melting and cast from the liquid state. No ternary phases were found. The investigated part of the C–Co–Nb phase diagram contains three isothermal three-phase planes, corresponding to the following four-phase invariant reactions with participation of liquid: L ↔ + NbC + C (1310° С), L ↔ NbC + + Co3Nb (1230°С), L + NbC + Co2Nb ↔ Co3Nb (1430°С). The eutectic temperature for the quasibinary sys tem Co–NbC was determined to be 1420±10°C for an optimal niobium to carbon ratio of 9.5 (wt.%) in the carbide (NbC0.814).

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