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J Nanosci Nanotechnol. 2019 Jul 1;19(7):4090-4096. doi: 10.1166/jnn.2019.16267.

Thermochemical Nitriding and Oxynitriding of Ti Alloys.

Author information

1
Physico-Mechanical Institute of National Academy of Sciences, Lviv 79601, Ukraine.
2
Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul 04763, Republic of Korea.
3
Department of Mechanical Engineering, Mehran University of Engineering and Technology, SZAB Campus, Khairpur Mir's 66020, Pakistan.
4
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.

Abstract

Nitrided and oxynitrided coatings that formed on α alloy (c.p.-Ti), near-α alloy (Ti-2.1Al-2.5Zr), (α + β) alloy (Ti-6Al-4V), and β alloy (Ti-6Al-2Zr-1Mo-1V) were microstructurally characterized. The nitriding at 950 °C and PN₂ ═ 105 Pa for 5 h formed TiN, Ti₂N, and α-Ti(N) layers from the surface. The nitriding tendency increased in the order of β alloy, (α + β) alloy, near-α alloy, and α alloy. The Ti-N coatings transformed to Ti-N-O coatings when the nitrided alloys were exposed to PO₂ ═ 10-2 Pa during cooling at the final stage of the nitriding. This oxynitriding process led to the formation of TiNxO1-x, Ti₂N, and α-Ti(N,O) layers from the surface where a small amount of rutile-TiO₂ coexisted. Oxynitriding was more effective than nitriding in increasing the surface microhardness, with the former accumulating more compressive residual stress than the latter.

PMID:
30764975
DOI:
10.1166/jnn.2019.16267

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