Titanium, titanium alloy and niti foams with high ductility

Details Titanium, titanium alloy and niti foams with high ductility Titanium, titanium alloy and niti foams with high ductility

B - Operations, Transporting

22

F

B22F 3/11 (2006.01) B22F 3/10 (2006.01)

Patent

CA 2611373

The present invention is related to a method for manufacturing a high ductility Ti-, Ti-alloy or NiTi-foam, meaning a compression strain higher than 10%, comprising the steps of: Preparing a powder suspension of a Ti-, NiTi- or Ti-alloy powder, Bring said powder suspension into a desired form by gelcasting to form a green artefact, A calcination step wherein said green artefact is calcined, and Sintering said artefact, characterised in that said calcination step comprises a slow heating step wherein said green artefact is heated at a rate lower or equal to 20~C/hour to a temperature between 400~C and 600~C and that the Ti-, NiTi- or Ti-alloy powder has a particle size less than 100 ~m. A high ductility Ti-, Ti-alloy or NiTi-foam, with a compression higher than 10%, with a theoretical density less than 30%, pore size (cell size) between 50 to 1000~m can be obtained with such a method.

L'invention concerne un procédé de fabrication de Ti-, d'alliage Ti-, ou de mousse NiTi- à ténacité élevée, soit une contrainte de compression excédant 10 %, qui consiste à préparer une suspension pulvérulente de Ti-, NiTi- ou de poudre d'alliage Ti-, à amener ladite suspension pulvérulente dans la forme recherchée par coulage de gel pour former un artefact cru, à calciner ledit artefact cru, et à fritter ledit artefact. L'étape de calcination comprend un stade de chauffage lent au cours duquel l'artefact cru est chauffé à une vitesse inférieure ou égale à 20 °C/heure à une température comprise entre 400 °C et 600 °C et la poudre Ti-, NiTi-, ou alliage Ti- présente une granulométrie inférieure à 100 µm. Ce procédé permet d'obtenir Ti-, alliage Ti- ou mousse NiTi- à ténacité élevée, présentant une compression supérieure à 10 %, une densité théorique inférieure à 30 %, et une dimension des pores (grandeur des cellules) se situant entre 50 et 1000 µm.

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