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Alkaline‐Earth‐Fluoride—LaF 3 Systems with Implications for Electroslag Melting
Author(s) -
NAFZIGER R. H.,
RIAZANCE N.
Publication year - 1972
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1972.tb11235.x
Subject(s) - liquidus , eutectic system , solidus , alkali metal , melting point , alkaline earth metal , halide , melting temperature , solid solution , analytical chemistry (journal) , materials science , fluoride , mineralogy , metal , chemistry , metallurgy , inorganic chemistry , alloy , composite material , organic chemistry , chromatography
Liquidus and solidus curves in the systems CaF 2 ‐LaF 3 , SrF 2 ‐LaF 3 , BaF 2 ‐LaF 3 , and MgF 2 ‐LaF 3 under ½ atm helium pressure were determined by thermal analysis as an aid in the selection of suitable fluxes for electroslag melting of reactive metals. The systems CaF 2 ‐LaF 3 , SrF 2 ‐LaF 3 , and BaF 2 ‐LaF 3 each contain (1) one eutectic, (2) no intermediate phases, and (3) two solid solutions whose lattice parameters vary linearly with composition. The liquidus curves in the systems SrF 2 ‐LaF 3 and BaF 2 ‐LaF 3 exhibit maxima. The system MgF 2 ‐LaF 3 is of the simple eutectic type with no detectable terminal solid solutions. The smallest temperature interval observed between a fluoride‐flux liquidus and the melting point of Ti occurs at the dystectic composition in the system SrF 2 ‐LaF 3 . Differences in density between metal and flux are more favorable in the system BaF 2 ‐LaF 3 than in pure LaF 3 . These observations suggest potential advantages of using fluxes from the systems studied for electroslag melting of reactive metals.