Abstract: A substrate characterised in that it is at least partially surface-coated with a coating containing at least one so-called “barrier” layer having silica and one or more material(s) X selected from among SiC, Si, Si3N4, in which layer the amount of X varies between 25-wt. % and 50.-wt. % in relation to the total weight of the barrier layer, the barrier layer being formed by grains of one or more materials X covered at least partially in a silica shell, and the barrier layer being in direct contact with the substrate.

Abstract: A substrate, in particular intended for contact with liquid silicon, wherein it is at least partially surface-coated with a multilayer coating formed by: at least one layer, known as the adhesion layer, contiguous with the substrate, having an open porosity of at least 30%, and formed of a material comprising silica and silicon nitride, said material having a silica content of between 10 wt.-% and 55 wt.-% in relation to the total weight thereof; and a layer different from the adhesion layer, known as the release layer, located on the surface of the adhesion layer and formed of a material including silica and silicon nitride, said material having a silica content of between 2 wt.-% and 10 wt.-% in relation to the total weight thereof.

Abstract: The present invention concerns a crucible for solidifying a silicon ingot from molten silicon, characterized in that it is coated at least partially on the inner surface thereof with an outer layer provided in the form of a stack of laminations, each lamination having a thickness varying from 5 to 150 ?m, and being formed from a material obtained by thermal decomposition of polysilazane(s) and/or polysiloxane(s) and wherein inorganic particles are embedded having a size varying from 50 ?m to 200 ?m. The present invention further concerns a method for preparing such crucibles.

Abstract: A substrate, in particular intended for contact with liquid silicon, wherein it is at least partially surface-coated with a multilayer coating formed by: at least one layer, known as the adhesion layer, contiguous with the substrate, having an open porosity of at least 30%, and formed of a material comprising silica and silicon nitride, said material having a silica content of between 10 wt.-% and 55 wt.-% in relation to the total weight thereof; and a layer different from the adhesion layer, known as the release layer, located on the surface of the adhesion layer and formed of a material including silica and silicon nitride, said material having a silica content of between 2 wt.-% and 10 wt.-% in relation to the total weight thereof.

Abstract: A substrate characterised in that it is at least partially surface-coated with a coating containing at least one so-called “barrier” layer having silica and one or more material(s) X selected from among SiC, Si, Si3N4, in which layer the amount of X varies between 25-wt. % and 50.-wt. % in relation to the total weight of the barrier layer, the barrier layer being formed by grains of one or more materials X covered at least partially in a silica shell, and the barrier layer being in direct contact with the substrate.

Abstract: The present invention concerns a crucible for solidifying a silicon ingot from molten silicon, characterised in that it is coated at least partially on the inner surface thereof with an outer layer provided in the form of a stack of laminations, each lamination having a thickness varying from 5 to 150 ?m, and being formed from a material obtained by thermal decomposition of polysilazane(s) and/or polysiloxane(s) and wherein inorganic particles are embedded having a size varying from 50 ?m to 200 ?m. The present invention further concerns a method for preparing such crucibles.

Abstract: The present invention relates to a crucible that can be used for solidifying a silicon ingot from molten silicon, characterized in that same is at least partially coated on the inner surface thereof with at least one layer consisting of a material produced by thermal decomposition of polysilizane(s), said layer having a shear strength greater than 1 Pa and no higher than 500 MPa, and being in the form of a stack of adjoining layers of non-contiguous tiles. The invention also relates to a method for preparing such crucibles.