Influence of nanocrystalline Ni–Ti reaction agent on self-propagating high-temperature synthesized porous NiTi

Goh, C. W.; Gu, Yang; Lim, Chu Sing; Tay, B.Y.

doi:10.1016/j.intermet.2006.06.002

Cited by 16 publications

(12 citation statements)

References 21 publications

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“…It was found that the most of the pores exist threedimensionally as interconnected pore structures by examining in the cross-sectional direction. 17 The pore shape is near circular or elliptic, as shown in Figure 2(a). The pore size between 100 and 600 m with a general porosity of 55 vol % is favorable for osseointegration for biomedical application.…”

Section: Resultsmentioning

confidence: 95%

“…The pellets with the composition of 100 wt % elemental Ni-Ti was also prepared for comparison. The green porosity of the two different types of samples was about 46 vol %, 17 which was calculated directly from the geometry and weight of the compacted samples. The ignition technique was employed for the synthesis of porous NiTi by using a plasma transferred arc (Thermal Arc Ultima 150).…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, the addition of nanocrystalline powder resulted in an improvement in the hardness and crack growth resistance in the SHS end-product. 15 In this study, chemical treatment was carried out at the temperature of 80°C to produce a TiO 2 layer. The chemically treated porous NiTi alloys were subsequently immersed in SBF for various periods of time to investigate their biomimetic apatite forming ability.…”

Section: Introductionmentioning

confidence: 99%

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In vitro bioactivity and osteoblast response of porous NiTi synthesized by SHS using nanocrystalline Ni‐Ti reaction agent

Tay

et al. 2006

J Biomedical Materials Res

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Porous NiTi with an average porosity of 55 vol % and a general pore size of 100-600 microm was synthesized by self-propagating high temperature synthesis (SHS) with the addition of mechanically alloyed nanocrystalline Ni-Ti as the reaction agent. The SHS of porous NiTi using elemental powders was also performed for comparison. To enhance the bioactivity of the metal surface, porous NiTi synthesized by nanocrystalline Ni-Ti was subjected to chemical treatment to form a layer of TiO(2) coating. The porous NiTi with TiO(2) coating was subsequently immersed in a simulated body fluid (SBF) to investigate its apatite forming ability. The effects of the addition of nanocrystalline Ni-Ti as reaction agent and the application of apatite coating on osteoblastic behavior were studied in primary cultures of human osteoblast cells. Results showed that the main phases in porous NiTi synthesized by elemental powders were NiTi, Ti(2)Ni, and unreacted free Ni. By using nanocrystalline Ni-Ti as reaction agent, the secondary intermetallic phase of Ti(2)Ni was significantly reduced and the free Ni was eliminated. TiO(2) coating with anatase phase was formed on the surface of porous NiTi after the chemical treatment. A layer consisting of nanocrystalline carbonate-containing apatite was formed on the surface of TiO(2) coating after soaking in SBF. The preliminary cell culture studies showed that the porous NiTi synthesized with the addition of nanocrystalline Ni-Ti attracted marked attachment and proliferation of the osteoblast cells. This gives the evidence of the potential biomedical applications of the porous NiTi.

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Section: Resultsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In vitro bioactivity and osteoblast response of porous NiTi synthesized by SHS using nanocrystalline Ni‐Ti reaction agent

Tay

et al. 2006

J Biomedical Materials Res

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“…The Gibbs free energies of these phases indicate that the driving force for the formation of Ti 2 Ni and Ni 3 Ti is stronger than that of NiTi. Therefore, even though the formation of NiTi occurs, it is unlikely that these secondary phases of Ti 2 Ni and Ni 3 Ti will entirely disappear [9]. Chu et al [10] have fabricated porous NiTi shape memory alloy with less undesired phases, using the improved self-propagating high-temperature synthesis (SHS) technique by means of providing the higher heat flux density for SHS reactions using the improved ignition technique and adopting the powder compacts with a larger volume-surface area ratio to reduce heat losses.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Single-Phase NiTi by Combustion Synthesis of Mechanically Activated Powders

Nasab

Aboutalebi

Seyedein

et al. 2012

Journal of Metallurgy

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Single-phase NiTi was fabricated through the thermal explosion mode of combustion synthesis of mechanically activated powders. Combustion and ignition temperatures of combustion synthesis were investigated in different milling times. In this process, equiatomic powder mixtures of nickel and titanium were activated by planetary ball mill and pressed into disk-shaped pellets then heated in a tube furnace, while temperature-time profile was recorded. X-ray diffraction analysis (XRD) was performed on milled powders as well as synthesized samples. Scanning electron microscopy (SEM) was also used to study the microstructural evolution during milling. The results showed that there was a threshold milling time to obtain single-phase NiTi. It was also seen that the ignition temperature and combustion temperature were reduced significantly by increasing milling time.

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“…Particularly, its porosity has an induction in the bone tissue growing, which makes the fixation of implant more safe and reliable. The typical methods of fabricating porous NiTi include hot isostatic press (HIP) [10] , conventional sintering (CS) [11] , self-propagating high-temperature synthesis (SHS) [12] and laser spray [13,14] . The methods of HIP, CS and SHS can obtain the bulk porous NiTi.…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous microstructures on NiTi alloy surface with femtosecond laser pulses

et al. 2008

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Porous microstructures on Nickel-Titanium (NiTi) alloy surfaces were prepared by linearly polarized femtosecond lasers with moving focal point at a certain speed. It was found that various novel microstructures from feather-like ripples to cluster-like porous textures could be formed with increasing laser energy. Particularly, when the laser energy was 400 μJ, a periodic porous metal surface was generated. Measurement of X-ray diffraction showed that the grains on the sample surface were refined through femtosecond laser ablation processes, but the crystal structures still kept their original states. Analysis by X-ray photoelectron spectroscopy revealed that Ni/Ti on the sample surface was changed with an evident oxidization of titanium element under different laser energies. This investigation provides a new approach to improve the biocompatibility of NiTi-based implant devices.femtosecond laser, NiTi alloy, porous microstructures, grain refinement

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Influence of nanocrystalline Ni–Ti reaction agent on self-propagating high-temperature synthesized porous NiTi

Cited by 16 publications

References 21 publications

In vitro bioactivity and osteoblast response of porous NiTi synthesized by SHS using nanocrystalline Ni‐Ti reaction agent

In vitro bioactivity and osteoblast response of porous NiTi synthesized by SHS using nanocrystalline Ni‐Ti reaction agent

Fabrication of Single-Phase NiTi by Combustion Synthesis of Mechanically Activated Powders

Preparation of porous microstructures on NiTi alloy surface with femtosecond laser pulses

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