Rheological Behaviour of Nickel -Titanium Powder Mixture Feedstock Prepared by Dual Assymetric Centrifuge (DAC) Speed Mixer

 
 
 
  • Abstract
  • Keywords
  • References
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  • Abstract


    Preparation of porous NiTi alloy by Metal Injection Moulding (MIM) requires several important steps, starting from mixing of elemental powders with polymeric binder until the final process of sintering. In this present work, some initial findings on the powder-binder mixture, so called feedstock were investigated.  Theoretical density of Nickel, Titanium and NiTi powders which were determined using pycnometer are 8.97 g/cm3, 4.58 g/cm3 and 6.36 g/cm3 respectively. The composition for Nickel and Titanium powders mixture studied was 56wt% Ni - 44wt% Ti or nearly around 50.9at% Ni – 49.1at% Ti and mixing torque analysis performed using a Brabender Mixer suggested two powder-binder volume fractions of 61%vol and 64%vol. The elemental powders of Nickel and Titanium with particle size of 20 µm and 22 µm were mixed along with water soluble binder system comprised of Polyethelene Glycol/Polymethyl-metacrylate/Stearic Acid (PEG/PMMA/SA) by a Dual-Asymmetric Centrifuge (DAC) speed mixer. The feedstock prepared was evaluated by flow analysis using Capillary Rheometer at four different temperatures; 120ºC, 130ºC, 140ºC and 150ºC and morphological analysis by scanning electron microscopy (SEM). Results showed that DAC technique used in the present work promoted significantly fast processing of MIM feedstock in comparison with conventional method. Besides, the feedstock prepared exhibited good flow behavior, particularly at the temperature of 140ºC, which is supported by SEM morphology that showed uniform powder-binder bonding.

     

     

     

  • Keywords


    Nickel Titanium; Rheology; MIM

  • References


      [1] L. Petrini and F. Migliavacca, “Biomedical Applications of Shape Memory Alloys,” Journal of. Metallurgy, Volume 2011, (2011), pp. 1–15.

      [2] A. Biesiekierski, J. Wang, M. Abdel-Hady Gepreel, and C. Wen, “A new look at biomedical Ti-based shape memory alloys,” Acta Biomaterialia, Volume 8, No. 5, (2012), pp. 1661–1669.

      [3] A. S. Jabur, J. T. Al-Haidary, and E. S. Al-Hasani, “Characterization of Ni-Ti shape memory alloys prepared by powder metallurgy,” Journal of Alloys and Compounds, Volume 578, (2013), pp. 136–142.

      [4] G. Chen, P. Cao, G. Wen, N. Edmonds, and Y. Li, “Using an agar-based binder to produce porous NiTi alloys by metal injection moulding,” Intermetallics, Volume 37, (2013), pp. 92–99.

      [5] X. Liu, S. Wu, K.W.K. Yeung, Y.L. Chan, T. Hu, Z. Xu, X. Liu, J.C.Y. Chung, K.M.C. Cheung and P.K. Chu, “Relationship between osseointegration and superelastic biomechanics in porous NiTi scaffolds,” Biomaterials, Volume. 32, No. 2, (2011), pp. 330–338.

      [6] G. Chen, P. Cao, and N. Edmonds, “Porous NiTi alloys produced by press-and-sinter from Ni/Ti and Ni/TiH2mixtures,” Materials Science & Engineering A, Volume 582, (2013), pp. 117–125.

      [7] M. H. Ismail, R. Goodall, H. A. Davies, and I. Todd, “Formation of microporous NiTi by transient liquid phase sintering of elemental powders,” Materials Science and Engineering C, Volume 32, No. 6, (2012), pp. 1480–1485.

      [8] M. F. F. A. Hamidi, W.S.W. Harun, M, Samykano, S.A.C. Ghani, Z. Ghazalli, F. Ahmad and A.B. Sulong “A review of biocompatible metal injection moulding process parameters for biomedical applications,” Materials Science and Engineering C, Volume 78, (2017), pp. 1263–1276.

      [9] X. Huang, B., Liang, S., & X. Qu, “The rheology of metal injection moulding,” Journal of Materials Processing Technology, Volume 137(1-3), No. 132–137, (2003), pp. 132–137.

      [10] R.M. German, Powder Metallurgy & Particulate Materials Processing: The Processes, Materials, Products, Properties and Applications, Metal Powder Industries Federation, (2005), pp. 121-151.

      [11] R.M. German and A. Bose, Injection Molding of Metals and Ceramics, Metal Powder Industries federation, (1997), pp. 25-53.

      [12] M.H. Ismail, (2012), Porous NiTi Alloy By Metal Injection Moulding (MIM) Using partly Water Soluble Binder System, Doctor of Philosophy, University of Sheffield, UK.

      [13] M. R. Harun, N. Muhamad, A. B. Sulong, N. H. M. Nor, and M. H. I. Ibrahim, “Rheological Investigation of ZK60 Magnesium Alloy Feedstock for Metal Injection Moulding Using Palm Stearin Based Binder System,” Appl. Mech. Mater., vol. 44–47, pp. 4126–4130, 2010.

      [14] G. Thavanayagam, K. L. Pickering, J. E. Swan, and P. Cao, “Analysis of rheological behaviour of titanium feedstocks formulated with a water-soluble binder system for powder injection moulding,” Powder Technol., vol. 269, pp. 227–232, 2014.

      [15] M. D. Hayat, A. Goswami, S. Matthews, T. Li, X. Yuan, and P. Cao, “Modification of PEG/PMMA binder by PVP for titanium metal injection moulding,” Powder Technol., vol. 315, pp. 243–249, 2017.

      [16] A. Dehghan-Manshadi, M. J. Bermingham, M. S. Dargusch, D. H. StJohn, and M. Qian, “Metal injection moulding of titanium and titanium alloys: Challenges and recent development,” Powder Technol., vol. 319, pp. 289–301, 2017.

      [17] N. H. Mohamad Nor, N. Muhamad, K. R. Jamaludin, S. Ahmad, and M. H. I. Ibrahim, “Characterisation of Titanium Alloy Feedstock for Metal Injection Moulding Using Palm Stearin Binder System,” Adv. Mater. Res., vol. 264–265, pp. 586–591, 2011.

      [18] M. H. Ismail, N. H. M. Nor, H. A. Davies, and I. Todd, “Feedstock flow characterization and processing of porous niti by metal injection moulding (MIM),” J. Teknol., vol. 76, no. 11, pp. 97–105, 2015.

      [19] Z. Abdullah, R. Razali, I. Subuki, M. A. Omar, and M. H. Ismail, “An Overview of Powder Metallurgy (PM) Method for Porous Nickel Titanium Shape Memory Alloy (SMA),” Adv. Mater. Res., vol. 1133, no. February, pp. 269–274, 2016.


 

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Article ID: 22152
 
DOI: 10.14419/ijet.v7i4.26.22152




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