Research Regarding the Possibility of Obtaining Nitinol by Powder Metallurgy
Fecha
2012Autor
Potecaşu, Octavian
Potecaşu, Florentina
Alexandru, Petrică
Braz Fernandes, Francesco Manuel
Cordeiro Silva, Rui Jorge
Figueiredo Pereira Das Neves, Filipe Carlos
Metadatos
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In the paper the obtaining of nitinol by pressing and sintering of a mixture of
nickel and titanium powders is presented. The fabrication of NiTi alloys by powder
metallurgy allows avoiding the usual problems related to classical casting
obtaining methods (problems related to defects caused by segregation or excessive
growth of the grains), it also assures an exact control of the chemical composition
and offers the possibility of manufacturing a variety of components very close to
their final shape.
Although the advantages of manufacturing products by powder metallurgy are
certain, the first research presented in this paper in the case of nickel and titanium
powders have showed some unwanted aspects related to powder metallurgy
processing which are yet to be resolved, that is, the high oxide content, the high
content of secondary phases, also the difficulty of obtaining dense materials. The
main conclusion is that it is imperative to do the sintering in a protecting system (if
possible in vacuum), because of the high content of oxygen observed in the
measured sintered products.
Colecciones
- 2012 fascicula9 nr3 [13]