| http://www.w3.org/ns/prov#value | - Other inert gases, for example nitrogen, may also be used In another embodiment of the invention, in the step of final melting of the layer, a molten salt, such as KCl, LiCl, MgCl2 or a mixture of these salts is used, to which it is optionally possible to add AlF3, cryolite (AlF6Na3), chiolite (Na5Al3F14) or any other appropriate salt, so as to protect the surface of the liquid metal from oxidatio
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