Porous NiTi produced by NiTiTa transient-liquid-assisted method

Authors

  • Orawan Worasub Faculty of Engineering, Center of Advanced Studies in Industrial Technology, Faculty of Engineering, Kasetsart University
  • Ampika Bansiddhi Faculty of Engineering, Center of Advanced Studies in Industrial Technology, Faculty of Engineering, Kasetsart University

Keywords:

Metal foam, Nickel-titanium alloy, Tantalum, NiTi-Ta, Sodium chloride

Abstract

This work presents a novel method for preparing porous NiTi by powder metallurgy using a vacuum sintering technique. Tantalum was used as a transient liquid phase creator, which enhanced the sinterability of NiTi powders. The effect of Ta content and powder packing on the degree of densification were investigated. The porous NiTi exhibited shape memory behavior and a large recovery strain, analyzed by differential scanning calorimetry and compressive testing, respectively, making the material promising for bone implant applications. In addition, macroporosity was created by using NaCl spaceholders. Adding 3 atomic percent of Ta and 60 volume percent NaCl space-holder resulted in a foam containing 60 percent porosity with an average pore size larger than 100 micrometers. A new type of metallic spaceholder, coarse Ta powder, was also demonstrated here, and functioned simultaneously as a densification enhancer and space-holder.

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References

Bansiddhi, A., Sargeant, T.D., Stupp, S. I. and Dunand, D.C. (2008). Porous NiTi for bone implants : A review. Acta Biomaterialia 4(4) : 773-782.

Haider, W., Munroe, N., Pulletikurthi, C., Gill, P.K.S, Amruthaluri, S. (2009). A Comparative Biocompatibility Analysis of Ternary Nitinol Alloys. J. Mater. Eng. Perform. 18(5-6) : 760- 764.

Wu, K.H. and Ma, J.L.(2001). Effects of Ta addition on microstructure and transformation behavior of Ni-Ti alloys. J. Mater. Sci.17(1) : 5-6.

Schetky, L. McD. and Wu, M.H. (2003). Issues in the further development of Nitinol properties and processing for medical device applications. In : Proceeding of ASM Materials & Processes for Medical Devices Conference. Anaheim, California : 271-276.

Köhl, M., Bram,M., Buchkremer, H-P., Stöver, D., Habijan, T. and Köller, M. (2007). Production of Highly Porous Near-Net-Shape NiTi Components for Biomedical Applications. In : Proceedings of the Fifth International Conference on Porous Metals and Metallic Foams. Montréal, QC. Canada : 295-298.

Bansiddhi, A. and Dunand, D.C. (2009). Shape-memory NiTi-Nb foams. J. Mater. Res. 24(6): 2107-2117.

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Published

2012-06-30

How to Cite

[1]
O. Worasub and A. . Bansiddhi, “Porous NiTi produced by NiTiTa transient-liquid-assisted method”, J Met Mater Miner, vol. 22, no. 1, Jun. 2012.

Issue

Vol. 22 No. 1 (2012)

Section

Original Research Articles

License

Copyright (c) 2012 Journal of Metals, Materials and Minerals

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