INFLUENCES OF KF-AlF 3 SOLVENT COMPOSITIONS ON THE INTERFACIAL REACTIONS BETWEEN ALUMINUM AND KBF 4

Al-B alloys are widely used in industries.Their manufacturing has attracted great attentions.Generally, the Al-B master alloys are manufactured by reacting KBF 4 with molten aluminum.A lot of work has been done to investigate the effects of reaction technologies on the manufacturing of Al-B alloys.But little attentions were paid to the reaction mechanisms at the interface between the aluminum melt and the fluoride salt.The interfacial reactions between Al and KBF 4 play a critical role in the production of Al-B master alloys.Investigations on the interfacial reactions in four different KF-AlF 3 solvents were carried out.It was demonstrated that a boride layer formed at the interface for all the four solvents.There existed AlF 3 between the boride layer and the aluminum melt when the eutectic KF-AlF 3 solvent or the hypereutectic solvents were used.AlF 3 formed by the reaction between BF 3 and Al.KEY WORDS Al, KBF 4 , AlF 3 , interfacial reaction, solvent composition Al-B ª × [1][2][3][4][5][6][7][8][9] , Ð«È ² ÕÄ. × Ó ° •℄ Ð « Al-B ª , ¥ Al ¾ ʦ B • (KBF 4 ) ℄ , ¾