Microstructural evolution of silicon-platinum modified aluminide coatings on superalloy GTD-111

被引：21

作者：

Azarmehr, Seyed Amir ^{[1
]}

Shirvani, Kourosh ^{[1
]}

Schuetze, Michael ^{[2
]}

Galetz, Mathias ^{[2
]}

机构：

[1] Iranian Res Org Sci & Technol IROST, Dept Mat & Renewal Energy, Tehran, Iran

[2] DECHEMA Forschungsinst, Theodor Heuss Allee 25, D-60486 Frankfurt, Germany

来源：

SURFACE & COATINGS TECHNOLOGY | 2017年 / 321卷

关键词：

Silicon; Platinum; Aluminide coating; Slurry; GTD-111; TEMPERATURE OXIDATION BEHAVIOR; HOT-CORROSION BEHAVIOR; NI-BASED SUPERALLOYS; COMBUSTION SYNTHESIS; BASE SUPERALLOYS; SITE PREFERENCE; PHASE-DIAGRAM; SLURRY; ALLOYS; NICKEL;

D O I：

10.1016/j.surfcoat.2017.05.019

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The microstructure evolution of (Si,Pt)-modified aluminide coatings has been investigated. Coatings were prepared by slurry silico-aluminizing of different thicknesses of platinum-electroplated GTD-111 Ni-based superalloy. Microstructure and phase characterizations were conducted by means of SEM, EDX, XRD and EPMA. The composition of the coating's outer layer altered from single beta-(Ni,Pt)Al phase to two phase beta-NiAl + PtAl2 by increasing the initial Pt thickness. Silicon diffusion into the coating is shown to be less in the presence of the PtAl2 phase. Furthermore, refractory metal -containing precipitates in the outer two phase layer of the platinum modified coating were replaced by silicides in the corresponding (Si,Pt)-modified aluminide coating. (C) 2017 Published by Elsevier B.V.

引用

页码：455 / 463

页数：9

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