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Thermochemical Nitriding and Oxynitriding of Ti Alloys

Title
Thermochemical Nitriding and Oxynitriding of Ti Alloys
Author
이근상
Keywords
Titanium; Nitriding; Oxynitriding; TiN; TiON
Issue Date
2019-07
Publisher
AMER SCIENTIFIC PUBLISHERS
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v. 19, no. 7, Page. 4090-4096
Abstract
Nitrided and oxynitrided coatings that formed on alpha alloy (c.p.-Ti), near-alpha alloy (Ti-2.1Al-2.5Zr), (alpha + beta) alloy (Ti-6Al-4V), and beta alloy (Ti-6Al-2Zr-1Mo-1V) were microstructurally characterized. The nitriding at 950 degrees C and P-N2 = 10(5) Pa for 5 h formed TiN, Ti2N, and alpha-Ti(N) layers from the surface. The nitriding tendency increased in the order of beta alloy, (alpha + beta) alloy, near-alpha alloy, and alpha alloy. The Ti-N coatings transformed to Ti-N-O coatings when the nitrided alloys were exposed to P-O2 = 10(-2) Pa during cooling at the final stage of the nitriding. This oxynitriding process led to the formation of TiNxO1-x, Ti2N, and alpha-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.
URI
https://www.ingentaconnect.com/content/asp/jnn/2019/00000019/00000007/art00051;jsessionid=amq8j8771rci9.x-ic-live-03https://repository.hanyang.ac.kr/handle/20.500.11754/152365
ISSN
1533-4880; 1533-4899
DOI
10.1166/jnn.2019.16267
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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