An effective and low-cost method to prepare Re-doped aluminide coating on a Ni-based single crystal superalloy

被引：6
作者：
Li, W. [1 ,2 ]
Fu, L. B. [1 ,2 ]
Li, S. M. [1 ,2 ]
Peng, X. [1 ,2 ]
Jiang, S. M. [2 ]
Gong, J. [2 ]
Sun, C. [2 ]
机构：
[1] Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
[2] Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
来源：
MATERIALS LETTERS | 2021年 / 285卷
关键词：
Rhenium; Aluminide coating; Diffusion; Microstructure; CYCLIC-OXIDATION RESISTANCE; IMPROVEMENT;
D O I：
10.1016/j.matlet.2020.129112
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In order to prepare Re doped aluminide coating, an effective and low-cost method of electroplating Ni-Re layer and subsequent low temperature high activity pack cementation method was used. Re-doped Ni2Al3 coating was consisted of an outer Ni2Al3 layer with dispersed Re-rich precipitates, a middle Ni2Al3 layer with dispersed W-rich precipitates and a bottom layer of interdiffusion zone (IDZ). Interestingly, Re existed in the outer coating in form of fine Re-rich precipitates because of low solid solubility of Re in Ni2Al3. [Al] was produced and absorbed on the surface of Ni-Re layer, and the activity of Al was far higher than that of Ni during pack cementation at 800 degrees C. Thus, Re-doped Ni2Al3 coating was mainly formed by virtually singular inward diffusion of [Al] through the Ni2Al3 layer. (c) 2020 Elsevier B.V. All rights reserved.
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页数：4
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