Invensil

The Japan Research and Development Center for Metals

Centre National De La Recherche Scientifique

Institut Polytechnique De Grenoble

Centre National De La Recherche Scientifique-cnrs

Ferropem

Ferropem S.a.s.

Yves Delannoy

Marcel Garnier

Gerard Baluais

Yves Caratini

Christian Trassy

Pascal Gardin

Anthony Bardaine

Jean-Yves Lamant

Jean-Marie Galpin

Jacqueline Etay

Guy Chichignoud

Cyrille Ndzogha

Jochen Altenberend

Gérard Baluais

The invention concerns a silicon designed in particular for making solar cells containing a total of impurities ranging between 100 and 400 ppm, a boron content ranging between 0.5 and 3 ppm, a phosphorus/boron content ratio ranging between 1 and 3, and a content of metal elements ranging between 30 and 300 ppm. The invention also concerns a method for making such a silicon from an oxygen- or chorine-refined metallurgical silicon containing at least 500 ppm of metal elements, and comprising: refusion under neutral atmosphere of the refined silicon, in an electric furnace equipped with a hot crucible; transferring the molten silicon, to provide a plasma refining, in an electric furnace equipped with a hot crucible; plasma refining with as plasma-forming gas a mixture of argon and of at least a gas belonging the group consisting of chlorine, fluorine, HCI and HF; casting under controlled atmosphere in an ingot mold wherein is produced segregated solidification.

High purity metallurgical silicon and method for preparing same

The invention concerns a method which consists in: simultaneously subjecting the meniscus of the molten metal present in the ingot mould to the action of an axial alternating electromagnetic field tending to provide it with a general dome-like shape and to the action of a transverse direct electromagnetic field designed to attenuate the surface agitation of the meniscus. The implementing installation comprises an ingot mould ( ) with cooled assembled plates ( and ) for casting metal slabs, an alternating current coil ( ) enclosing the ingot mould at the meniscus ( ) of the molten metal to produce an axial magnetic field, collinear with the casting axis ( ), and a direct magnetic field winding passing through the large plates of the ingot mould at the meniscus ( ) perpendicular to the casting axis.

Method for vertical continuous casting of metals using electromagnetic fields and casting installation therefor

Growing community of inventors

Crolles, France

Yves Delannoy