Electrolytic deposition of silicon and of silicon alloys. Part IV: Preparation of alloys with a high content of silicon, and silicon refining

Abstract Cu-Si, Al-Si and Ni-Si alloys with a high content of silicon were prepared by the electrolysis of cryolite-silica melts using Cu, Al or Ni as cathode. Cu-Al alloys were prepared by electrolysis of cryolite-alumina mixtures, using a copper cathode.An attempt was made to prepare pure Si or an Si alloy by the anodic dissolution of Cu-Si, Cu-Si-Fe and Al-Si-Fe alloys using graphite, Ni and Cu cathodes. Pure Si could be deposited when graphite anodes were used. In other cases, Si and Al were deposited simultaneously. Resume Des alliages de Cu-Si, Al-Si et Ni-Si ayant des teneurs elevees de silicium ont ete prepares par electrolyse de melanges cryolite-silice sur cathodes de Cu, Al et Ni. Les alliages Cu-Al ont ete prepares par electrolyse de melanges cryolite-alumine sur cathode cuivre.Les auteurs ont aussi essaye d'obtenir du Si pur ou un alliage de Si par dissolution anodique d'alliages Cu-Si, Cu-Si-Fe et Al-Si-Fe sur cathodes de graphite, Ni et Cu. Le Si pur s'est depose sur cathode de graphite. Da...