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Fabrication of NiTi Nano-Powder by Simple SPEX Mechanical Method and Fabrication of NiTi Foam by KCl Space-Holders

Naderi Khorshidi, Zeinab | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41317 (07)
  4. University: Sharif University of technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhad, Khatiboleslam
  7. Abstract:
  8. NiTi Memory alloys have a great range of applications. Porous metallic biomaterials (e.g., stainless steel, chromium- cobalt, titanium and nickel–titanium (NiTi)) represent superior alternatives to traditional non-porous metallic implants for two main reasons. First, open porosity can enhance bone ingrowth and thus improve fixation at the interface between bone and implant. Second, porosity decreases the mismatch in stiffness between bone and implant, thus reducing stress-shielding effects which shorten the lifetime of the implant through bone resorption and loosening. NiTi foams may thus find multi-functional applications such as bone implants, impedance-matching connectors between structural parts, energy-absorbing structures, separators, and actuators. Nano powder of NiTi is produced by simple SPEX mechanical method. Initial application of nano powder seems be for fabrication of NiTi foam. It provides continuous structure. As well as, NiTi memory alloy foam is produced in this research by warm pressing and subsequently vacuum sintering in 5.510-5 torr and several temperature. For this, A mixture of NiTi and NaCl powders was warm pressed at 300 oC and the NaCl phase was then dissolved in water in 2 stages. Results show that structure of obtained foam is continues when nano powder of NiTi use as precursor material. But, when powder by micron size use for fabrication of NiTi foam, the porous will be greater. Hardness of foam produced by nano powders is more than produced foam by micron powders
  9. Keywords:
  10. Nanopowder ; Foam ; Hot Press ; Shape Memory Alloy ; Nitinol Alloy ; Nickel-Titanium Foam ; Space Holder ; Vaccum Sintering

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