DEVELOPMENT OF NITI SHAPE MEMORY ALLOY MESHES
JACKSON DE BRITO SIMOES1; Francisco Fernando Roberto Pereira2; Hudson Medeiros de Almeida Cardins3; RÔMULO MARTINS DE HOLANDA3; Carlos José De Araujo3
1 UFERSA; 2 University of Cambridge; 3 UFCG
doi:10.20906/CPS/COB-2015-2403
Resumo
This work consists primarily in manufacturing and characterizing shape memory alloy (SMA) NiTi meshes. These meshes with functional properties of shape memory effect and superelasticity have the potential of various applications by presenting mechanical characteristics which are compatible with meshes of conventional materials such as titanium. However, these SMA meshes evince the advantage of providing new capabilities for different applications with large strains and force generation in different temperatures what can be very important for a specific traumatology or cardiovascular treatment. For the development of these new products, a NiTi SMA was chosen and manufactured by a plasma fusion process followed by injection in a ceramic coating mold. The raw meshes obtained were then heat treated and hot-rolled for thickness reduction. The obtained and processed components were then characterized by checking its dimensions, chemical composition by EDS, hardness, transformation temperatures by calorimetry differential scanning (DSC) and uniaxial tensile test strength by taking different maximum strains. At room temperature, the obtained meshes showed superelasticity characteristics by recovering from strains up to 4%.
Palavras-chave: Shape memory alloys; NiTi; SMA mesh