Joint between a metal part and a ceramic part based sic...

C - Chemistry – Metallurgy – 04 – B

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C04B 37/02 (2006.01)

Patent

CA 2632731

The invention relates to a joint between a metal part (1) and a ceramic part (7) which is made from a ceramic material that is based on SiC and/or C. The inventive joint is characterised in that it comprises a stacked structure consisting of the following elements which are assembled in pairs, in the following order, by means of brazing, namely: the metal part (1), a first spacer (3), a second spacer (5), and the ceramic part (7). According to the invention, the second spacer (5) is made from another ceramic material which is less chemically reactive with metals than SiC or C and which has a lower expansion coefficient than that of the material forming the metal part (1). Moreover, the first spacer (3) is metal and can deform in order to compensate for the expansion differential between the metal part (1) and the second spacer (5). The invention also relates to the use of said joint in a turbomachine.

Assemblage entre une pièce métallique (1) et une pièce en matériau céramique (7) réalisée en un matériau céramique à base de SiC et/ou de C, caractérisé en ce qu'il comporte une structure empilée comprenant les éléments suivants assemblés deux à deux, dans cet ordre, par brasage : - ladite pièce métallique (1) ; - une première pièce intercalaire (3) ; - une deuxième pièce intercalaire (5) ; et - ladite pièce en matériau céramique (7), dans lequel : - la deuxième pièce intercalaire (5) est réalisée en un autre matériau céramique, chimiquement moins réactif vis-à-vis des métaux que SiC ou C, qui présente un coefficient de dilatation inférieur à celui du matériau constitutif de ladite pièce métallique (1) ; et - la première pièce intercalaire (3) est métallique et apte à se déformer pour compenser l'écart de dilatation entre ladite pièce métallique (1) et la deuxième pièce intercalaire (5). Utilisation de cet assemblage dans une turbomachine.

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