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The System Caf2-cao-al2o3 Under One-third Atmosphere of Helium.

Authors
Nafziger-RH
Source
High Temperature Sci 1973 Dec; 5(6):414-422
Link
NIOSHTIC No.
10010854
Abstract
A least three eutectics, one peritectic, and one ternary compound (11 cao.7 Al2o3.Caf2) characterize the metallurgically important system caf2-cao-al2o3 under one-third atmosphere helium. Primary phases of common fluxes used in the electroslag remelting process include caf2, 11 cao.7 Al2o3.Caf2 (probably in solid solution with 12 cao.7 Al2o3) cao, and cao.Al2o3. Nearly all of these fluxes crystallize to the three eutectics whose compositions (weight- percent) and temperatures were determined as (1) 43 caf2-40 cao-17 al2o3, 1,193 deg +/-5 deg. C; (2) 51 caf2-19 cao-30 al2o3, 1,352 deg +/-7 deg c; and (3) 69 caf2-6 cao-25 also3, 1,377 deg. +/-4 Deg. C. Small postulated phase fields of 3 cao.Al2o3 and cao.Al2o3 are due to reactions with caf2. A two-liquid region and a stable compound (3 cao.3 Al2o3.Caf2) were not detected, in contrast to sealed capsule experiments described in the literature. The system in air would probably show slight modifications from the present results owing to phase hydrolysis.
Publication Date
19731201
Document Type
OP;
Fiscal Year
1974
Identifying No.
OP 63-74
Issue of Publication
6
Source Name
High Temperature Sci., V. 5, No. 6, December 1973, PP. 414-422
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division