Removal of Transition Metal Impurities in Aluminium Melts by Boron Additives

Effects of Boron-strontium Interactions on Eutectic Modification in Al-10 mass%Si Alloys

“…It is reported that AlB 2 particles, which have been suggested to be nucleation sites for eutectic silicon, 6) are present in higher concentrations in the AlB3 master alloy than in the AlB8 master alloy. 7) On the other hand, the AlB8 master alloy contains more AlB 12 particles that moderately react with, or scavenge, impurities in the melt (possibly strontium). However, in this study the rate of Sr loss with B addition was similar for both master alloys.…”

“…Due to the reaction of impurities (e.g. Sr) with aluminium borides, 7) for example, it is possible that B-Sr particles settle in the crucible, resulting in the reduced level of dissolved strontium in the melt available for modification. The exact mechanism responsible for the strontium loss is poorly understood and is a topic of our ongoing research.…”

Production of low impurity aluminium rotor for motor efficiency enhancement

“…Most particles are borides and the majority of them contained V and Ti, which were identified as (V, Ti)B2. Evidence and discussion of transition metal borides precipitating after boron additions in aluminium melts have been reported [6,[8][9][10]. This suggests that transition metal borides are stable in molten aluminium which paves the way for simple and practical removal of transition metal impurities and hence enhancement of electrical conductivity in aluminium.…”

Affinement des grains des alliages Al-(0-17%)Si /

“…Les alliages mères de type Al-B sont largement répandus dans la production de l'aluminium conducteur électrique (Al ultra pur) pour enlever des impuretés en métal de transition, tel que le titane, le vanadium, le chrome et le zirconium [136] et [137]. Comme hétérogène en l'avant de la croissance colonnaire comme l'a mentionné Sturz et al [147].…”