Paper Title:
Implications of Diffusion on the Composition and Microstructures of Platinum Modified Aluminide Coatings on CMSX-4 Single Crystal Superalloy
  Abstract

State-of-the-art aluminide coatings for high pressure aeroturbines rely on their chemical stability through the addition of platinum. In this work, the influence of diffusion on the composition and microstructure of Pt/Al coatings is investigated upon the different processing steps. Upon heat treatment of the electrodeposited Pt layers, the ready solubility of Pt in the ’-Ni3Al and its concentration gradient allow fast ingress of this element in the coating in spite of the higher diffusion coefficients of the substrate elements. The relatively high Pt contents at the surface thereafter promote Al ingress upon aluminisation by creating a greater concentration gradient between the coating atmosphere and the coating. This results in a -NiAl based coating grown by both Ni outward and Al inward diffusion. The diffusivity of Pt, Ni and Al being dependant on the stoichiometry of the -NiAl coating, different metal particles may precipitate mainly at the NiAl grain boundaries. In addition, the diffusion of the refractory elements towards the interdiffusion layer seems to be hurdled by increasing the Pt content. As a result of the countercurrent diffusion of species, different microstructures and compositions will appear across the coatings.

  Info
Periodical
Defect and Diffusion Forum (Volumes 289-292)
Edited by
A. Agüero, J.M. Albella, M.P. Hierro, J. Phillibert and F.J. Pérez Trujillo
Pages
277-284
DOI
10.4028/www.scientific.net/DDF.289-292.277
Citation
F. Pedraza, "Implications of Diffusion on the Composition and Microstructures of Platinum Modified Aluminide Coatings on CMSX-4 Single Crystal Superalloy", Defect and Diffusion Forum, Vols. 289-292, pp. 277-284, 2009
Online since
April 2009
Authors
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Zhen Bing Cai, Min Hao Zhu, Xiu Zhou Lin, Ji Liang Mo, Zhong Rong Zhou
Abstract:Nickel base Ni60 and cobalt base Co-Cr-W coatings were prepared on substrate of refractory alloy steel 4Cr14NiW2Mo by laser-cladding...
878
Authors: Guo Dong Hao, Yong Liang Guo, Gang Liu, Xin Mei Zhang
Abstract:Nanostructured surface layer was produced on Ti-6Al-4V alloy by surface mechanical attrition treatment (SMAT) technique, and the composite...
67
Authors: Ming Zhu, Mei Shuan Li
Abstract:Cr-Al-N coatings were deposited on the surface of the (111) single silicon for the aim to study the thermal stability of this kind of...
249
Authors: Xian Hui Li, Yu Jun Xue, De Ying Zhang, Ji Shun Li
Chapter 3: Advanced Manufacturing Technology
Abstract:The Ni-Nd2O3 nanocomposite coatings were prepared by electrodeposition with different modes of ultrasound action. The...
280
Authors: Shun Qi Zheng, Xiao Jing Li, Li Ping Zhu, Yun Chen, Jian Min Luo
Chapter 1: Alloy and Nanometer Materials
Abstract:Micro-arc oxidation (MAO) coatings were synthesized on MB3 magnesium alloy substrate. Two different electrolyte (Ⅰ) and electrolyte (Ⅱ) were...
54