Method for manufacturing a part having a complex shape by flash sintering, and device for implementing such a method
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A technology for rapid sintering, component applications in blade support elements, engine elements, turbines, etc.
Active Publication Date: 2014-01-08
CENT NAT DE LA RECHERCHE SCI
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As far as the inventors are aware, rapid sintering has never been applied to fabricate components as complex as
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[0055] figure 1 A turbine blade preform PF made of TiAl by the rapid sintering method according to the invention is shown. This preform, with a height of 36 mm, was essentially the same as the finished blade, requiring only one finishing step to remove about 0.5 mm of material thickness. Accordingly, the preform may qualify as being "near finished size". The material thickness to be removed can be reduced to a value of about 0.1 mm, which corresponds to a layer in which the material is contaminated with graphite. Just like the ready-to-use blade, the preform PF consists of a solid base B with a complex shape that cannot be defined by a small number of simple geometric shapes, and a sheet shape in the form of a slanted shell with a pronounced slenderness along the axis "x" Part V. It can be immediately noticed that the shape of this part is more complex than that of all the objects manufactured by rapid sintering described in the above-mentioned prior art documents.
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Abstract
The invention relates to a method for manufacturing a metal, ceramic, or composite part (PF) by flash sintering, which comprises simultaneously applying, inside a die (M), a uniaxial pressure and an electric current to a device containing a powder constituent material, said uniaxial pressure being applied by means of at least two pistons (P1, P2) which slide toward one another inside said die and each of which has a bearing surface (F1, F2) contacting said material, said bearing surfaces engaging so as to define the shape of the part to be manufactured, characterised in that: said part has a complex shape, including at least one first slender portion (V), such as a rod, plate, bevel, or shell, and a second portion (B), such as a base, plinth, or solid part, which is not slender in the slender direction of said first portion, and in that said uniaxial pressure is applied in a direction (z) substantially parallel to the smallest dimension of said first portion of the part, or to one of the two smallest dimensions thereof if said part is a rod. The invention also relates to a device for implementing such a method, and to a turbine blade made of a TiAl intermetallic alloy or a metal / silicide composite sintered by flash sintering.
Description
technical field [0001] The present invention relates to a method of using rapid sintering to manufacture components having complex shapes, such as turbine blade preforms near finished dimensions. The invention also relates to a device for carrying out such a method, as well as a turbine blade made of sintered TiAl metal-metal alloy or silicide alloy, which can be obtained with this method. Background technique [0002] Rapid sintering (also known by the acronym "SPS" which stands for "spark plasma sintering") is a sintering technique in which powdered material is subjected to uniaxial pressure inside a mold while applying an electric current to Rapid heating to compact powdery materials. Rapid heating limits the diffusion process and, thus, obtains materials that retain their original microstructure. In the case of metal-metal alloys, the beneficial effect is mainly that the increase in the coarseness of the particle size is limited, thus promoting the refinement of the mi...
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