Fabrication of TiN Layer on Nanostructured NiTi Alloy Surface by Plasma Nitriding

T. Hu; S.L. Wu; Y. Zhao; J. Jiang; C.L. Chu; Ricky K.Y. Fu; Paul K. Chu; Kelvin W.K. Yeung

Fabrication of TiN Layer on Nanostructured NiTi Alloy Surface by Plasma Nitriding

T. Hu, S.L. Wu, Y. Zhao, J. Jiang, C.L. Chu, Ricky K.Y. Fu, Paul K. Chu^*, Kelvin W.K. Yeung

^*Corresponding author for this work

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

Abstract

NiTi alloy is a widely used metal as surgical implants due to its unique shape memory effect and super-elasticity. To improve surface biocompatibility, TiN coating is usually fabricated on the surface of NiTi alloy. However, the coating is usually to thin to resist fretting resulted from cyclic motion between NiTi device and human tissue. In the present work, we introduced a nanostructured surface layer on NiTi alloy by surface mechanical attrition treatment (SMAT). Due to the large volume grain boundaries in the nanostructured layer, diffusivity of nitrogen can be significantly enhanced and thus thick TiN layer formed with post plasma nitriding treatment. Our results show the corrosion resistance, surface hardness and wear resistance were improved.

Original language	English
Title of host publication	The 11th International Workshop on Plasma-Based Ion Implantation & Deposition
Pages	122-123
Publication status	Published - Sept 2011
Event	11th International Workshop on Plasma-Based Ion Implantation and Deposition (PBII&D) - Harbin, China Duration: 8 Sept 2011 → 12 Sept 2011

Conference

Conference	11th International Workshop on Plasma-Based Ion Implantation and Deposition (PBII&D)
Country/Territory	China
City	Harbin
Period	8/09/11 → 12/09/11

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@inproceedings{868bdb59b77944b79df9450b3e27a89d,

title = "Fabrication of TiN Layer on Nanostructured NiTi Alloy Surface by Plasma Nitriding",

abstract = "NiTi alloy is a widely used metal as surgical implants due to its unique shape memory effect and super-elasticity. To improve surface biocompatibility, TiN coating is usually fabricated on the surface of NiTi alloy. However, the coating is usually to thin to resist fretting resulted from cyclic motion between NiTi device and human tissue. In the present work, we introduced a nanostructured surface layer on NiTi alloy by surface mechanical attrition treatment (SMAT). Due to the large volume grain boundaries in the nanostructured layer, diffusivity of nitrogen can be significantly enhanced and thus thick TiN layer formed with post plasma nitriding treatment. Our results show the corrosion resistance, surface hardness and wear resistance were improved.",

author = "T. Hu and S.L. Wu and Y. Zhao and J. Jiang and C.L. Chu and Fu, {Ricky K.Y.} and Chu, {Paul K.} and Yeung, {Kelvin W.K.}",

year = "2011",

month = sep,

language = "English",

pages = "122--123",

booktitle = "The 11th International Workshop on Plasma-Based Ion Implantation & Deposition",

note = "11th International Workshop on Plasma-Based Ion Implantation and Deposition (PBII&D) ; Conference date: 08-09-2011 Through 12-09-2011",

}

TY - GEN

T1 - Fabrication of TiN Layer on Nanostructured NiTi Alloy Surface by Plasma Nitriding

AU - Hu, T.

AU - Wu, S.L.

AU - Zhao, Y.

AU - Jiang, J.

AU - Chu, C.L.

AU - Fu, Ricky K.Y.

AU - Chu, Paul K.

AU - Yeung, Kelvin W.K.

PY - 2011/9

Y1 - 2011/9

N2 - NiTi alloy is a widely used metal as surgical implants due to its unique shape memory effect and super-elasticity. To improve surface biocompatibility, TiN coating is usually fabricated on the surface of NiTi alloy. However, the coating is usually to thin to resist fretting resulted from cyclic motion between NiTi device and human tissue. In the present work, we introduced a nanostructured surface layer on NiTi alloy by surface mechanical attrition treatment (SMAT). Due to the large volume grain boundaries in the nanostructured layer, diffusivity of nitrogen can be significantly enhanced and thus thick TiN layer formed with post plasma nitriding treatment. Our results show the corrosion resistance, surface hardness and wear resistance were improved.

AB - NiTi alloy is a widely used metal as surgical implants due to its unique shape memory effect and super-elasticity. To improve surface biocompatibility, TiN coating is usually fabricated on the surface of NiTi alloy. However, the coating is usually to thin to resist fretting resulted from cyclic motion between NiTi device and human tissue. In the present work, we introduced a nanostructured surface layer on NiTi alloy by surface mechanical attrition treatment (SMAT). Due to the large volume grain boundaries in the nanostructured layer, diffusivity of nitrogen can be significantly enhanced and thus thick TiN layer formed with post plasma nitriding treatment. Our results show the corrosion resistance, surface hardness and wear resistance were improved.

UR - http://www.cityu.edu.hk/phy/appkchu/Publications/2011/11.C27.pdf

M3 - RGC 32 - Refereed conference paper (with host publication)

SP - 122

EP - 123

BT - The 11th International Workshop on Plasma-Based Ion Implantation & Deposition

T2 - 11th International Workshop on Plasma-Based Ion Implantation and Deposition (PBII&D)

Y2 - 8 September 2011 through 12 September 2011

ER -

Fabrication of TiN Layer on Nanostructured NiTi Alloy Surface by Plasma Nitriding

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