Structure and wear properties of laser gas nitrided NiTi surface

Zhao, Na; Man, Hau Chung; Cui, Zhenduo; Yang, Xu

doi:10.1016/j.surfcoat.2005.04.043

Cited by 30 publications

(18 citation statements)

References 13 publications

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“…In addition, under the higher nitrogen flow rate, there will be more TiN phase formed in the liquid Ti(Al) solid solution according to Eq. (1), so the volume fraction of TiN phase in the TiN/Ti 3 Al IMC coating increased with increasing nitrogen flow rate which was similar to the results presented in reference [17] (Figs. 1 and 2).…”

Section: Microstructure Of the Tin/ti 3 Al Imc Coatingssupporting

confidence: 87%

“…In accordance with the variation of wear volumes, microfracture was observed on their worn surfaces due to the low ductility of the TiN/Ti 3 Al IMC coatings. Even the above, the wear resistance of the TiN/Ti 3 Al IMC coatings was better than that of the Ti 3 Al coating which was attributed to the presence of hard TiN phase [15][16][17]. Furthermore, the more TiN phase, the harder of the TiN/Ti 3 Al IMC coatings, and the more wear resistance of the TiN/Ti 3 Al IMC coating.…”

Section: Sliding Wear Behaviormentioning

confidence: 90%

“…Under the dry sliding wear tests, the hard TiN phase in the TiN/Ti 3 Al IMC coatings may withstand the external normal load [17,26], and it is reasonable to postulate that the more TiN phase, the higher external normal load the TiN/Ti 3 Al IMC coating will withstand. As a result, the hard TiN phase can very effectively withstand the lower normal loads (≤2 N for Sample 2 and ≤3 N for Sample 3), and the lighter TiN particles were left on the worn surfaces (Fig.…”

Section: Sliding Wear Behaviormentioning

confidence: 99%

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Microstructure and tribological properties of in situ synthesized TiN/Ti3Al intermetallic matrix composite coatings on titanium by laser cladding and laser nitriding

Guo

Zhou

Zhang

et al. 2008

Materials Science and Engineering: A

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Section: Microstructure Of the Tin/ti 3 Al Imc Coatingssupporting

confidence: 87%

Section: Sliding Wear Behaviormentioning

confidence: 90%

Section: Sliding Wear Behaviormentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and tribological properties of in situ synthesized TiN/Ti3Al intermetallic matrix composite coatings on titanium by laser cladding and laser nitriding

Guo

Zhou

Zhang

et al. 2008

Materials Science and Engineering: A

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“…After the PGN process the nickel release for the first day was reduced from 3.6 µg day -1 cm -2 for the mechanically polished specimen to 1 µg day -1 cm -2 . The effects of nitrogen gas flow were investigated by Zhao et al[41]. The laser parameters were similar to the research by Cui et al[40].…”

mentioning

confidence: 80%

Surface Nitriding and Oxidation of Nitinol

Bazochaharbakhsh

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SURFACE NITRIDING AND OXIDATION OF NITINOL By Edin Bazochaharbakhsh Nitinol has been widely employed in biomedical devices due to its unique mechanical properties such as superelasticity, shape memory, and good biocompatibility. However, nickel ion release from the surface of the Nitinol is an issue. Surface nitriding and oxidation was performed on the Nitinol specimens to develop a nickel-free oxide layer on the surface. Nitinol specimens were nitrided in nitrogen + 4% hydrogen at 800-1000 o C for 10-30 min and further nitrided in nitrogen + 5% ammonia at 500-675 o C for 0-30 min. The thickness and chemical composition, specifically the nickel content of the surface layer, were determined by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), respectively. The effect of the nitriding time and temperature on the thickness and chemical composition of the nitride layer was evaluated. Nitriding temperature was found to be more effective than nitriding time on the thickness of TiN layer. Titanium nitride, the dominant phase on the surface of the nitrided specimens, was nickel free. The nitrided Nitinol specimens were then oxidized at 675 o C and 700 o C for 30 and 60 min, respectively. The chemical composition and elemental depth profile showed that oxidizing Nitinol specimens with a 0.4 µm thick nitride layer on the surface did not provide a nickel-free oxide layer on the surface of the Nitinol. However, oxidizing the Nitinol specimens with a surface nitride layer that was thicker than 6 µm resulted in a nickel-free oxide layer. v ACKNOWLEDGMENTS The author would like to thank his advisor, Dr. Guna Selvaduray, for invaluable mentoring, guidance, and support throughout this work with his knowledge and skills in the technical field, as well as in teaching. Special credit must also be given to Vince Christ at Nanolab Technologies and Robert Cormia at Foothill College for providing XPS and AFM analysis. The critical review and stewardship of Dr. Melanie McNeil and Dr.

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“…However, the microstructure of the coating was strongly dependent of the Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/optlastec composition of premixed powder and the laser processing parameters. The laser nitriding has received wide attention in recent years since it can be used to fabricate different types of TiN reinforced composite coatings, such as TiN/Ti [11][12][13] and TiN/NiTi [14] metal matrix composite (MMC) coating and TiN/Ti 3 Al [15,16] intermetallic matrix composite (IMC) coating on titanium alloys. These coatings have been proven to have high erosion and corrosion resistance by comparing with titanium alloys.…”

Section: Introductionmentioning

confidence: 99%