Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Herakles

Snecma

Safran Ceramics

Institut National Polytechnique De Grenoble

Valérie Chaumat

Jean-François Henne

Nadia Miloud-Ali

Fiqiri Hodaj

Eric Philippe

Eric Conete

Olivier Gillia

Thomas Revel

Philippe Bucci

Carole Pagano

Jean-François Fromentin

Olivier Mailliart

Nikolas Eustathopoulos

Alexey Koltsov

Joël Michel Benoit

Process for the moderately refractory assembly of at least two articles made of silicon carbide-based materials by non-reactive brazing in an oxidizing atmosphere, in which the articles are placed in contact with a non-reactive brazing composition and the assembly formed by the articles and the brazing composition is heated in an oxidizing atmosphere at a brazing temperature sufficient to melt the brazing composition so as to form a moderately refractory joint, wherein the non-reactive brazing composition is a composition A composed of silica (SiO), alumina (AlO) and calcium oxide (CaO), or alternatively a composition B composed of alumina (AlO), calcium oxide (Cao) and magnesium oxide (MgO). Brazing suspension, paste comprising a powder of said brazing composition and an organic binder. Refractory joint and assembly.

Process for the moderately refractory assembling of articles made of SiC-based materials by non-reactive brazing in an oxidizing atmosphere, brazing compositions, and joint and assembly obtained by this process

A method is described 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, wherein the parts are placed in contact with a non-reactive brazing composition, the assembly formed by the parts and the brazing composition is heated to a brazing temperature sufficient for completely or at least partially melting the brazing composition, or rendering the brazing composition viscous, and the parts and the brazing composition are cooled so as to form, after cooling the latter to ambient temperature, a moderately refractory joint. The non-reactive brazing composition is a composition A consisting of silica (SiO), alumina (AlO), and calcium oxide (CaO), or a composition B consisting of alumina (AlO), calcium oxide (CaO), and magnesium oxide (MgO), and, 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 on the surface layers comprising the surfaces to be assembled of the parts to be assembled, and/or in the brazing composition.

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

A method for joining, assembling, at least two parts made of silicon carbide-based materials by non-reactive brazing is provided. According to the method, the parts are contacted with a non-reactive brazing composition, the assembly formed by the parts and the brazing composition is heated to a brazing temperature sufficient to melt the brazing composition totally or at least partly, and the parts and brazing composition are cooled to that, after solidification of the brazing composition, a moderately refractory joint is formed; wherein the non-reactive brazing composition is an alloy comprising, in atomic percentages, 45% to 65% silicon, 28% to 45% nickel and 5% to 15% aluminum. A brazing composition as defined above is provided. A brazing paste, suspension comprising a powder of said brazing composition and an organic binder as well as a joint and assembly obtained the foregoing method are also provided.

Compositions for joining and assembling parts made of SiC-based materials

A method of assembling together by brazing two parts made of composite material, each part having an assembly face for brazing with the assembly face of the other part, the method including: making a plurality of cavities in the assembly face of at least one of the two composite material parts, at least some of the cavities opening out into one or more portions of the part that are situated outside the assembly face; interposing capillary elements between the assembly faces of the composite material parts; placing a brazing composition in contact with a portion of the capillary elements; and applying heat treatment to liquefy the brazing composition so as to cause the molten brazing composition to spread by capillarity between the assembly faces of the composite material parts.

Method for brazing parts made from a composite material, with anchoring of the brazed joint

A method for joining, assembling, at least two parts comprising silicon carbide-based materials is provided. The parts are contacted with a non-reactive brazing composition, the assembly having the parts and the brazing composition is heated to a brazing temperature sufficient to melt the brazing composition, and the parts and the brazing composition are cooled so that, after solidification of the brazing composition, a moderately refractory joint is formed. The brazing composition is a binary alloy consisting, in atomic percentages, of 60% to 66% silicon and 34% to 40% nickel. Prior to contacting the parts with the brazing composition, a reinforcement is added. A composition comprising the brazing composition and a reinforcement is provided. A brazing paste, suspension comprising a powder of the brazing composition, a reinforcement, and an organic liquid cement, binder, or an organic viscous gel is provided. A joint and assembly obtained by the foregoing method is provided.

Method for assembling, joining parts made of SiC-based materials by non-reactive brazing with addition of a reinforcement, brazing compositions and joint and assembly obtained by said method

A method for assembling at least two parts made of silicon carbide-based materials by non-reactive brazing is disclosed. The two parts are contacted with a non-reactive brazing composition. The assembly formed by the parts and the brazing composition is heated to a brazing temperature sufficient to melt the brazing composition. The parts and the brazing composition are cooled so that, after solidification of the brazing composition, a moderately refractory joint is formed. The non-reactive brazing composition is a binary alloy composed, in mass percentages, of about 46% to 99% silicon and 54% to 1% neodymium.

Method for assembling parts made of SiC materials by non-reactive brazing, brazing compositions, and joint and assembly obtained by said method

The invention relates to a method for assembling at least one part made of a porous carbon material with at least one part made of a copper-rich metal material, and to an alloy paste used to implement same. The method according to the invention includes a step comprising the use of an alloy based on copper and silicon, having formula I CuSi, wherein x and y are atomic percentages with 25&#x2266;x&#x2266;60, 40&#x2266;y&#x2266;75 and x+y&#x2267;95%, in order to assemble at least one part made of a porous carbon material with at least one part made of a copper-rich metal material. The invention is particularly suitable for use in the field of thermal engineering.

Method for the refractory assembly of a carbon material and a copper alloy

Method for joining, assembling parts made of SiC-based materials by non-reactive brazing, brazing compositions, and joint and assembly obtained by said method

A method for joining, assembling, at least two parts made of silicon carbide-based materials by non-reactive brazing is provided. According to the method, the parts are contacted with a non-reactive brazing composition, the assembly formed by the parts and the brazing composition is heated to a brazing temperature sufficient to melt the brazing composition totally or at least partly, and the parts and the brazing composition are cooled so that, after solidification of the brazing composition, a moderately refractory joint is formed; wherein the non-reactive brazing composition is a binary alloy consisting in atomic percentages, of 60% to 66% silicon and 34 to 40% nickel. A brazing composition as defined above is also provided. A paste, suspension of braze alloy comprising a powder of the brazing composition and an organic binder is provided. In addition, a joint and assembly obtained with the foregoing method is provided.

Method for assembling, joining parts made of SiC-based materials by non-reactive brazing, brazing compositions, and joint and assembly obtained by said method

The invention relates to a process for the metallization with a silicon alloy melting at a temperature T1 of certain zones of the surface of a part made of an oxide ceramic unable to be wetted by the said alloy, the said process comprising, in succession, a step of depositing carbon on the said zones of the said part that are to be metallized, a step of depositing the silicon alloy in solid form on at least one portion of the said part, so that the said alloy has at least one point of contact with the said zones to be metallized, followed by a heating step at a temperature greater than or equal to T1, the said alloy gathering in the molten state on the said zones to be metallized. This process applies also to the brazing of parts, at least one of which is a part made of an oxide ceramic unable to be wetted by the said alloy. Application of the said processes to the fields of electronics, electrical engineering, thermal engineering and chemical engineering.

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Saint-Paul-de-Varces, France

Valérie Chaumat