Improved counter-form for the manufacture of a metal aeronautical part

Abstract

A counter-form for producing metal aeronautical parts, in particular a turbine part by solid-phase densification, including a composite material containing, on the one hand, a first phase having formula Mn+1AlCn, where n=1 to 3 and M is a transition metal selected from the group consisting of titanium and/or molybdenum and/or niobium and/or chromium, and, on the other hand, a second phase having formula Al4C3.

1 . A counter-form for producing metal aeronautical parts, in particular a turbine part by solid-phase densification, comprising a composite material comprising, on the one hand, a first phase having formula M n+1 AlC n , where n=1 to 3 and M is a transition metal selected from the group consisting of titanium and/or molybdenum and/or niobium and/or chromium and, on the other hand, the composite material comprising a second phase having formula Al 4 C 3 . 
     
     
         2 . The counter-form according to  claim 1 , wherein the first phase is of one of the formulas among Cr 2 AlC, TisAlC 2 , Ti 2 AlC, Nb 4 AlC 3 , Nb 2 AlC or Mo 2 TiAlC 2 . 
     
     
         3 . The counter-form according to  claim 1 , wherein the composite material comprises between 1 and 50% of second phase by volume of the composite material, preferably between 1 and 20%. 
     
     
         4 . The counter-form according to  claim 1 , wherein an internal surface of the counter-form is covered by a layer of alumina. 
     
     
         5 . The counter-form according to  claim 4 , wherein the alumina layer has a thickness comprised between 1 and 50 μm. 
     
     
         6 . A process for manufacturing a counter-form for producing a hollow metal aeronautical part, in particular a turbine part by solid-phase densification, the counter-form comprising a composite material comprising, on the one hand, a first phase having formula M n+1 AlC n , where n=1 to 3 and M is a transition metal selected from the group consisting of titanium and/or molybdenum and/or niobium and/or chromium, on the other hand, the composite material comprising a second phase having formula Al 4 C 3 , the counter-form being obtained by a powder metallurgy process comprising a mixing step in which powders allowing to obtain the composite material are mixed, and a shaping step. 
     
     
         7 . The process according to  claim 6 , wherein the mixing step comprises mixing the pure powders constituting the first phase so as to obtain the first phase in powder form, then mixing said first phase in powder form with a powder of Al 4 C 3  so as to obtain the second phase. 
     
     
         8 . The process according to  claim 6 , wherein the mixing step comprises mixing the pure powders constituting the first phase with an excess of Al 4 C 3  powder so as to form the composite material in one operation. 
     
     
         9 . The process according to  claim 6 , wherein, during the step of shaping the counter-form, a supply channel configured to allow the supply of powder constituting the part to be manufactured, is provided in the counter-form. 
     
     
         10 . The process according to  claim 6 , wherein the first phase is of formula Cr 2 AlC, TisAlC 2  or Ti 2 AlC, the process comprising, after the step of shaping the counter-form, an oxidation step allowing the formation of a layer of alumina on an internal surface of the counter-form. 
     
     
         11 . A process for manufacturing a metal aeronautical part, in particular a turbine part by solid-phase densification, using a counter-form obtained by a process according to  claim 6 , the process comprising, after steps of filling the counter-form with a powder constituting the part to be manufactured and densifying said powder in the counter-form, a step of shaking the counter-form out by steaming. 
     
     
         12 . The process according to  claim 11 , comprising, after the shakeout step, a recovery step, in which the material shaken out by steaming is recovered so as to be reused for the manufacture of another counter-form starting from the mixing step.