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Wear and thermal properties of Zr-based amorphous surface alloyed materials fabricated by high-energy electron beam irradiation

Title
Wear and thermal properties of Zr-based amorphous surface alloyed materials fabricated by high-energy electron beam irradiation
Authors
Lee, KEuh, KLee, SKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2005
Publisher
ELSEVIER SCIENCE SA
Abstract
Zr-based amorphous surface alloyed materials were fabricated by high-energy electron beam irradiation in this study. A mixture of Zr-based amorphous powders and LiF + MgF2 flux was deposited on a pure copper substrate, and then an electron beam was directed on this powder mixture to fabricate a one-layered surface alloyed material. A two-layered surface alloyed material was also fabricated by irradiating electron beam again onto the powder mixture deposited on the one-layered surface alloyed material. The microstructural analysis results indicated that a number of coarse crystalline phase particles were formed in the one-layered surface alloyed layer, whereas a small amount of fine and hard crystalline particles were homogeneously distributed in the amorphous matrix of the two-layered surface alloyed layer. Owing to these fine and hard crystalline particles, the hardness and wear resistance of the two-layered surface alloyed layer improved over the one-layered surface alloyed layer or other kinds of surface alloyed layers. The thermal conductivity of the two-layered surface alloyed layer was much lower than that of titanium-alloy-based or stainless-steel-based surface alloyed layers. These findings suggested the possibility of applying Zr-based amorphous surface alloyed materials to high wear-resistant thermal barrier coatings or parts. (c) 2005 Elsevier B.V. All rights reserved.
Keywords
amorphous alloy; surface alloyed material; crystalline phase particle; high-energy electron beam irradiation; thermal barrier coating; BARRIER COATINGS; IMPROVEMENT; HARDNESS; GLASS
URI
http://oasis.postech.ac.kr/handle/2014.oak/29654
DOI
10.1016/J.JALLCOM.20
ISSN
0925-8388
Article Type
Article
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, vol. 400, no. 1-2, page. 171 - 177, 2005-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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