Activities of boron in the binary Ni-B and the ternary Co-Fe-B melts

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Metallurgical Transactions, B (Process Metallurgy); (United States)

DOI:https://doi.org/10.1007/BF02672526· OSTI ID:6073013

Ushio, R ^[1]; Ogawa, O ^[2]

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1. Sumitomo Metal Mining Nakakokuubun, Ichikawa 272 (JP)
2. Department of Metallurgy, Univ. of Tokyo, Bunkyo-ku, Tokyo 113 (JP)

This paper reports on activities of boron in the binary Ni-B and the ternary Co-Fe-B melts determined by the electromotive force (emf) measurement. A boron crystal was mainly used as the reference electrode, and a ternary 29 wt pct B{sub 2}O{sub 3}-42 wt pct CaO-29 wt pct Al{sub 2}O{sub 3} oxide melt was used as the electrolyte. Large negative deviations from Raoult's law have been found in both the binary and the ternary systems. The activity of nickel has been calculated from the measured boron activity by means of the Gibbs-Duhem equation. Standard Gibbs energies of formation of Ni{sub 3}B (s), Fe{sub 2}B (s), and Co{sub 3}B (s) were estimated and compared with available data.

• OSTI ID: 6073013
• Journal Information: Metallurgical Transactions, B (Process Metallurgy); (United States), Journal Name: Metallurgical Transactions, B (Process Metallurgy); (United States) Vol. 22:1; ISSN 0360-2141; ISSN MTTBC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALLOY SYSTEMS
BINARY ALLOY SYSTEMS
BORIDES
BORON
BORON COMPOUNDS
CALCULATION METHODS
CHEMICAL ANALYSIS
COBALT BORIDES
COBALT COMPOUNDS
ELECTROLYTES
ELECTROMOTIVE FORCE
ELEMENTS
ENERGY
FORMATION FREE ENTHALPY
FREE ENTHALPY
IRON BORIDES
IRON COMPOUNDS
NICKEL BORIDES
NICKEL COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
SEMIMETALS
TERNARY ALLOY SYSTEMS
THERMODYNAMIC ACTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS