Method for assembling parts made of SiC materials by means of non-reactive brazing in an oxidizing atmosphere, brazing compositions, and gasket and assembly obtained by said method

Method for assembling at least two parts made of silicon carbide based materials by non-reactive brazing in an oxidizing atmosphere, each of the parts comprising a surface to be assembled, said method comprising

• providing the at least two parts made of silicon carbide based materials,
• placing the at least two parts in contact with a non-reactive brazing composition to form an assembly,
• heating the assembly formed by the parts and the brazing composition to a brazing temperature sufficient for completely or at least partially melting the brazing composition, or rendering the brazing composition viscous, and
• cooling the assembly formed by the parts and the brazing composition to form, after the cooling of the brazing composition to ambient temperature, a moderately refractory joint;
• wherein the non-reactive brazing composition is a composition A consisting of silica (SiO2), alumina (Al2O3), and calcium oxide (CaO), and, optionally, titanium oxide, boron oxide and/or CaF2, or a composition B, consisting of alumina (Al2O3), calcium oxide (CaO), and magnesium oxide (MgO), and, optionally, titanium oxide, boron oxide and/or CaF2, and
• wherein before heating the assembly formed by the parts and the brazing composition to the brazing temperature,
• a supply of silicon in a non-oxidized form is carried out on the surfaces to be assembled of the parts to be assembled and/or a supply of silicon in a non-oxidized form is carried out in surface layers comprising the surfaces to be assembled of the parts to be assembled, and/or a supply of silicon in non-oxidized form is added to the non-reactive brazing composition.