Method for making parts with an insert made of a metal-matrix composite material
View Patent ↗The invention relates to a method for making a metal part that comprises a reinforcement ( 15 ) made of ceramic fibers. The method comprises the following steps: forming at least one annular-shaped insert ( 15 ) by assembling a bundle of metal-coated fibers; placing the insert into a hollow metal mold ( 10 ) such that the insert is spaced between the walls ( 10 a, 10 b ) of the mold; filling the mold with a metal powder; generating vacuum in the mold and closing the same; hot isostatic compressing the assembly at a temperature and under a pressure sufficient for binding the powder particles between them and for binding the insert fibers between them; removing the mold and optionally machining to the desired shape.
1. A process for manufacturing a metal part that includes at least one ceramic-fiber reinforcement, comprising:
forming at least one insert, by assembling metal-coated ceramic fibers into a bundle;
incorporating the insert into a hollow metal mold in such a way that the insert is spaced away from the walls of the mold;
filling the mold with a metal powder;
creating a vacuum in the mold and closing the mold;
hot isostatic pressing of the assembly, at a temperature and a pressure that are sufficient to bond the metal powder particles and the metal-coated fibers of the insert; and
removing the mold and, where appropriate, machining to the desired shape.
2. The process as claimed in claim 1 , the insert wherein is of annular shape.
3. The process as claimed in claim 1 , wherein the insert has at least one straight portion.
4. The process as claimed in claim 1 , wherein the insert is straight and has been formed from coated filaments subjected together to an insert hot isostatic pressing treatment.
5. The process as claimed in claim 1 , wherein the insert is placed in the mold by means of a support.
6. The process as claimed in claim 5 , wherein the support is the mandrel for winding the insert.
7. The process as claimed in claim 1 , wherein at least two inserts are placed in the mold.
8. The process as claimed in claim 7 , wherein the two inserts are superposed.
9. The process as claimed in claim 1 , wherein projections are provided in the mold, the projections defining cavities in said metal part between zones reinforced by the metal-coated ceramic fibers.
10. The process as claimed in claim 1 , wherein the insert is of an axisymmetric shape.