Abstract: A seal intended to be inserted between a first and a second member, the seal including: two contact portions spaced from each other along a spacing direction, respectively intended to contact in a tight manner the first and second members, the contact portions being made of a first alloy displaying superplasticity properties under predetermined stress conditions including predetermined temperature conditions, the contact portions being supported by a support arranged therebetween, produced so as to display, under the predetermined temperature conditions, a greater mechanical compression resistance in the spacing direction than that of the contact portions.

Abstract: An assembly between a metal piece and a ceramic material piece made of SiC and/or C based ceramic material. The assembly includes a stack structure including the following elements assembled together in pairs in this order, by brazing: the metal piece; a first intermediate piece; a second intermediate piece; and the ceramic material piece. The second intermediate piece is made of another ceramic material, that is chemically less reactive relative to metals than are SiC or C, and that presents a coefficient of expansion smaller than that of the material constituting the metal piece. The first intermediate piece is made of metal and can deform to compensate for expansion difference between the metal piece and the second intermediate piece. The assembly can be used in a turbomachine.

Abstract: An assembly including a stack structure made up of the following elements assembled together by brazing: the titanium-based metal piece; a first intermediate piece suitable for deforming to accommodate differential expansion between the metal piece and a piece made of ceramic material based on silicon carbide and/or carbon; a second intermediate piece that is rigid, having a coefficient of expansion close to that of said ceramic material piece and made of aluminum nitride (AlN) or of tungsten (W); and the ceramic material piece is disclosed.

Abstract: An assembly including a metal piece, a piece made of ceramic material, and at least one intermediate connection element assembled to each of the pieces by brazing. The intermediate connection element includes a deformable sheet presenting at least two flat zones brazed to respective ones of the pieces, the two flat zones being interconnected by a deformable zone presenting at least two free undulations oriented in alternation towards the metal piece and towards the piece made of ceramic material.

Abstract: A device for depositing a mixture of powders to form an object with composition gradients, including: a plurality of tanks respectively configured to contain different powders; a powder mixer placed under the tanks and including a rotatably mounted mixing member; a plurality of powder dispensing mechanisms respectively cooperating with the tanks, and each configured to regulate mass flow rate of the powder escaping from a respective of the tanks towards the mixer; a powder mixture collector placed under the mixer; and a powder mixture dispenser placed under the collector.

Abstract: A method of assembling together titanium parts and steel parts by diffusion welding, the method interposing two thin layers of niobium or vanadium and copper respectively between a titanium part and a steel part, evacuating the assembly of parts and interposed metal layers, and subjecting the assembly to hot isostatic compression at a temperature lying in a range 900° C. to 950° C. and at a pressure lying in a range 1000 bars to 1500 bars for about two hours. The method can be applied to fabricating turbine shafts for turbomachines.

Abstract: The invention relates to a seal (10) intended to be inserted between a first and a second member, said seal comprising two contact portions (16) spaced from each other along a spacing direction, respectively intended to contact in a tight manner said first and second members, said contact portions (16) being made of a first alloy displaying superplasticity properties under predetermined stress conditions including predetermined temperature conditions, said contact portions (16) being supported by a support (22) arranged therebetween, produced so as to display, under said predetermined temperature conditions, a greater mechanical compression resistance in said spacing direction than that of the contact portions.

Abstract: The assembly comprises a stack structure made up of the following elements assembled together in pairs by brazing: the titanium-based metal piece (10); a first intermediate piece (11) suitable for deforming to accommodate differential expansion between the metal piece (10) and a piece (20) made of ceramic material based on silicon carbide and/or carbon; a second intermediate piece (12) that is rigid, having a coefficient of expansion close to that of said ceramic material piece (20) and made of aluminum nitride (AlN) or of tungsten (W); and the ceramic material piece (20).

Abstract: An assembly including a metal piece, a piece made of ceramic material, and at least one intermediate connection element assembled to each of the pieces by brazing. The intermediate connection element includes a deformable sheet presenting at least two flat zones brazed to respective ones of the pieces, the two flat zones being interconnected by a deformable zone presenting at least two free undulations oriented in alternation towards the metal piece and towards the piece made of ceramic material.

Abstract: An assembly between a metal piece and a ceramic material piece made of SiC and/or C based ceramic material. The assembly includes a stack structure including the following elements assembled together in pairs in this order, by brazing: the metal piece; a first intermediate piece; a second intermediate piece; and the ceramic material piece. The second intermediate piece is made of another ceramic material, that is chemically less reactive relative to metals than are SiC or C, and that presents a coefficient of expansion smaller than that of the material constituting the metal piece. The first intermediate piece is made of metal and can deform to compensate for expansion difference between the metal piece and the second intermediate piece. The assembly can be used in a turbomachine.