Partial phase diagram of the ternary reciprocal system KF-AlF3-Al2O3-K2O

Sylvie Schamm-Chardon (1, 2) , L Rabardel (1) , J Grannec (1) , R Naslain (1) , C Bernard (3) , O Relave (3)

1 Laboratoire de Chimie du Solide
2 CEMES - Centre d'élaboration de matériaux et d'études structurales
3 LTPCM - Laboratoire de thermodynamique et physico-chimie métallurgiques

A K2ZrF6 treatment improves the wettability of SiC (or C) fibers by aluminum alloys. A possible mechanism involves the formation of K3AlF6 followed by the dissolution of the alumina film. DTA analyses of K3AlF6-α-Al2O3 mixtures show that a temperature invariant transition occurs at 1132K, the solid containing trace amounts of KAlF4 and β-alumina at room temperature. Part of the ternary reciprocal system KF-AlF3-Al2O3-K2O is calculated, the Gibbs free energy of the liquid being described according to the CIS theory. The K3AlF6-Al2O3 isopteth section is given. It is characterized by a liquidus with a deep minimum at 1132K and 11.6 wt % alumina.

Domaines: Physique [physics]

Sylvie Schamm-Chardon, L Rabardel, J Grannec, R Naslain, C Bernard, et al.. Partial phase diagram of the ternary reciprocal system KF-AlF3-Al2O3-K2O. Calphad, 1990, 14 (4), pp.385-402. ⟨10.1016/0364-5916(90)90006-L⟩. ⟨hal-01745073⟩