Abstract: A method for coating a turbomachine part includes depositing a paint by electrophoresis on the part, a voltage between the part and a counter electrode being controlled during the deposition by imposing a sequence of pulsed voltage cycles, each cycle having: (i) a first voltage stabilization phase during which a first potential difference is imposed between the part and the counter electrode, and a second voltage stabilization phase during which a second potential difference is imposed, an absolute value of the first potential difference being between 0.1 V and 30 V, and an absolute value of the second potential difference being less than the absolute value of the first potential difference, the second potential difference being not equal to zero or being equal to zero, and (ii) a ratio R [duration of the first phase]/[duration of the first phase+duration of the second phase] between 1:10 and 1:3.

Abstract: A method for forming a layer of alumina on the surface of a metal alloy substrate including aluminium, includes depositing a first aluminium layer on a surface of the metallic substrate, depositing a second layer by vapour-phase deposition on the first layer, the second layer comprising aluminium, a halogen and oxygen, and heat treatment of the substrate coated with the first and second layers under oxidising atmosphere in order to form the layer of alumina at the surface of the metallic substrate.

Abstract: The invention relates to a movable blade made of aluminum and titanium alloy, for a turbojet engine turbine comprising a vane and at least one root at a distal end of the vane. The root has at least one azimuthal contact surface with another directly adjacent blade. A hard abrasion-resistant material, called wear-resistant material, is deposited onto the at least one azimuthal contact surface. A cavity is produced in said at least one azimuthal contact surface, the wear-resistant material being deposited in the cavity.

Abstract: A composition for sintering to fabricate a part comprising an alloy based on titanium aluminide, the composition including a powder of an alloy based on titanium aluminide, and an addition powder including a mixture of a metallic aluminum powder and of a metallic titanium powder. The composition includes 0.5% to 5% by weight of addition powder.

Abstract: A part include a refractory alloy including a niobium matrix having metal silicide inclusions present therein, the surface of the part being coated by a protective coating, the protective coating including a phase having the following stoichiometry: (NbxTi1-x)3M?Cr?Si?X? where M designates Fe, Co, or Ni, X designates one or more other elements that might be present, x lies in the range 0 to 1, x lies in the range 5 to 8.5, and the sum ?+? lies in the range 3 to 7; or Nb4M??Si?X??? where M? designates Fe, Co, or Ni, X? designates one or more other elements that might be present, ? lies in the range 3.2 to 4.8, and ? lies in the range 6 to 8.

Abstract: A method of fabricating a part coated with a protective coating, the method including using micro-arc oxidation treatment to form a protective coating on the outside surface of a part, the part including a niobium matrix having metallic silicide inclusions present therein, the current passing through the part being controlled during the micro-arc oxidation treatment in order to subject the part to a succession of current cycles, the ratio of (quantity of positive charge applied to the part)/(quantity of negative charge applied to the part) lying in the range 0.80 to 1.6 for each current cycle.

Abstract: A part include a refractory alloy including a niobium matrix having metal silicide inclusions present therein, the surface of the part being coated by a protective coating, the protective coating including a phase having the following stoichiometry: (NbxTi1-x)3M?Cr?Si?X? where M designates Fe, Co, or Ni, X designates one or more other elements that might be present, x lies in the range 0 to 1, x lies in the range 5 to 8.5, and the sum ?+? lies in the range 3 to 7; or Nb4M?ƒSi?X??? where M? designates Fe, Co, or Ni, X? designates one or more other elements that might be present, ? lies in the range 3.2 to 4.8, and ? lies in the range 6 to 8.

Abstract: Method for manufacturing a turbine engine part, said method comprising a step (101) of producing said part by powder metallurgy using a material forming the substrate of said part, then a finishing operation comprising at least one first step (103), in which a determined material is deposited onto at least one surface (S1) of the substrate of said part after the powder metallurgy production step (101), and a second step (104) corresponding to a heat treatment operation, so as to form a smooth coating for said surface (S1), characterised in that said determined material is a metal material, so as to form a metal coating.

Abstract: A method for manufacturing a part coated with a protective coating includes: forming a protective coating across all or part of the surface of a part, wherein the part includes a refractory alloy including a niobium matrix containing metal silicide inclusions, wherein the protective coating is formed by a pack carburization method from a cement including: i. a mixture A of (NbxTi1-x)3M3CrSi6 and M0.6Cr0.4Si where M denotes Fe, Co or Ni and x is between 0 and 1, or ii. a mixture B of M?Si, NbSi2 and Nb4M?4Si7 where M? denotes Fe, Co or Ni.

Abstract: A composition for sintering to fabricate a part comprising an alloy based on titanium aluminide, the composition including a powder of an alloy based on titanium aluminide, and an addition powder including a mixture of a metallic aluminum powder and of a metallic titanium powder. The composition includes 0.5% to 5% by weight of addition powder.

Abstract: A method for manufacturing a part coated with a protective coating includes: forming a protective coating across all or part of the surface of a part, wherein the part includes a refractory alloy including a niobium matrix containing metal silicide inclusions, wherein the protective coating is formed by a pack carburization method from a cement including: i. a mixture A of (NbxTi1-x)3M3CrSi6 and M0.6Cr0.4Si where M denotes Fe, Co or Ni and x is between 0 and 1, or ii. a mixture B of M?Si, NbSi2 and Nb4M?4Si7 where M? denotes Fe, Co or Ni.

Abstract: A method of fabricating a part coated with a protective coating, the method including using micro-arc oxidation treatment to form a protective coating on the outside surface of a part, the part including a niobium matrix having metallic silicide inclusions present therein, the current passing through the part being controlled during the micro-arc oxidation treatment in order to subject the part to a succession of current cycles, the ratio of (quantity of positive charge applied to the part)/(quantity of negative charge applied to the part) lying in the range 0.80 to 1.6 for each current cycle.

Abstract: A method of fabricating a part by selectively melting powder, the method comprising the following steps: depositing a first layer (12) of a first powder (2) having a first element as its main element; depositing, on the first layer, a second layer (15) of a second powder (22) having a second element as its main element, which second element is different from the first element; and moving a first energy beam (11), e.g. a laser beam or an electron beam, over the second layer (15), the energy delivered by the first beam serving to initiate an exothermic reaction between the first element and the second element, the energy given off by the exothermic reaction acting to locally melt together the first and second layers (12, 15).