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Open AccessArticle

Effects of Rare Earth Elements on Properties of Ni-Base Superalloy Powders and Coatings

by 1 and 2,*
Alloy Powder Co., Ltd., Lanzhou University of Technology, Lanzhou 730050, China
School of Science, Lanzhou University of Technology, Lanzhou 730050, China
Author to whom correspondence should be addressed.
Academic Editors: Niteen Jadhav and Andrew J. Vreugdenhil
Coatings 2017, 7(2), 30;
Received: 25 October 2016 / Revised: 6 January 2017 / Accepted: 23 January 2017 / Published: 16 February 2017
(This article belongs to the Special Issue Coatings for Corrosion Mitigation)
NiCrMoY alloy powders were prepared using inert gas atomization by incorporation of rare earth elements, such as Mo, Nb, and Y into Ni60A powders, the coatings were sprayed by oxy-acetylene flame spray and then remelted with high-frequency induction. The morphologies, hollow particle ratio, particle-size distribution, apparent density, flowability, and the oxygen content of the NiCrMoY alloy powders were investigated, and the microstructure and hardness of the coatings were evaluated by optical microscopy (OM). Due to incorporation of the rare earth elements of Mo, Nb, or Y, the majority of the NiCrMoY alloy particles are near-spherical, the minority of which have small satellites, the surface of the particles is smoother and hollow particles are fewer, the particles exhibit larger apparent density and lower flowability than those of particles without incorporation, i.e., Ni60A powders, and particle-size distribution exhibits a single peak and fits normal distribution. The microstructure of the NiCrMoY alloy coatings exhibits finer structure and Rockwell hardness HRC of 60–63 in which the bulk- and needle-like hard phases are formed. View Full-Text
Keywords: rare earth; microstructure; alloy powder; coating rare earth; microstructure; alloy powder; coating
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Hu, C.; Hou, S. Effects of Rare Earth Elements on Properties of Ni-Base Superalloy Powders and Coatings. Coatings 2017, 7, 30.

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