Preparation of High-Porosity NiTi Alloys by Powder Sintering with NaCl Pre-Forming
High-porosity NiTi shape memory alloy has pseudo-elasticity and shape memory effect for energy absorption and convenient on-line repair without replace. In this paper, high-porosity NiTi alloys with interconnected and well distributed pores were fabricated successfully by sintering, using NaCl as temporary space-holders. Optical microscope, SEM and XRD have been used to investigate the porosity and pore structures. The results show that porosity can be up to 88%.The size and porosity of the pores depend mainly on the addition of salts in the compacts, and are also related to temperature and forming pressure.
Zhengyi Jiang, Jingtao Han and Xianghua Liu
H. B. Sun et al., "Preparation of High-Porosity NiTi Alloys by Powder Sintering with NaCl Pre-Forming", Advanced Materials Research, Vols. 152-153, pp. 1342-1345, 2011