Porous NiTi alloy prepared from elemental powder sintering

Bing-Yun Li, Li-Jian Rong, Yi-Yi Li
1998 Journal of Materials Research  
An elemental powder sintering (EPS) technique has been developed for the synthesis of porous NiTi alloy, in which Ni and Ti powders are used as the reactants and TiH 2 powder is added as a pore-forming agent and active agent. Effects of various experimental parameters (sintering temperature, sintering time, and TiH 2 content) on the porosity, pore size and pore distribution as well as phase composition in experimental alloys are investigated. It is found that in order to avoid the formation of
more » ... arcinogenic pure Ni phase, the porous NiTi alloy should be synthesized over a temperature of 1223 K. This gives NiTi as the main phase without any elemental phase. Substitution of Ti by TiH 2 is more economic and more favorable to obtain homogeneous porous NiTi alloy. A proper selection of initial powders, ball-milling, pressing and sintering process makes it possible to achieve the porous NiTi alloy with desired properties.
doi:10.1557/jmr.1998.0389 fatcat:etphtgknlrhfxemrtifv2vxkeq