Paper Title:
Cross-Sectional TEM Characterization of Re-Based Diffusion Barrier on Nb Substrate
  Abstract

Cross-sectional structures of a Re-based diffusion barrier coating on Nb as ultra high temperature material were investigated in order to verify the crystalline structure and composition of the coated layer. Three types coating specimens were prepared by electroplating Re from an aqueous solution on an Nb substrate, followed by Cr-pack cementation in vacuum. The coating process produced three distinct layers; an outer Cr(Re) layer, an intermediate Re-Cr-Nb layer, and an inner Nb(Re) layer. A crystal structure of Cr(Re) and Nb(Re) layers possess similar single crystal bcc structure. The Re-Cr-Nb layer expected to act as a diffusion barrier between the substrate and the outer reservoir layer was comprised of cubic c phase and hexagonal Laves C14 phase. Moreover, several crystal defects such as dislocations and stacking faults as well as voids and cracks are observed in the coating specimen.

  Info
Periodical
Edited by
Toshio Maruyama, Masayuki Yoshiba, Kazuya Kurokawa, Yuuzou Kawahara and Nobuo Otsuka
Pages
318-323
DOI
10.4028/www.scientific.net/MSF.696.318
Citation
S. Eni, Y. Wang, N. Hashimoto, S. Ohnuki, T. Narita, "Cross-Sectional TEM Characterization of Re-Based Diffusion Barrier on Nb Substrate", Materials Science Forum, Vol. 696, pp. 318-323, 2011
Online since
September 2011
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: Dong Young Sung, In Soo Kim, Min Gu Lee, No Jin Park, Bee Lyong Yang, Jun Mo Yang, Jung Kyu Ko
Abstract:TiN thin films are widely used as a coating material due to their good mechanical and conductivity properties, high thermal properties,...
1371
Authors: Hiroyuki Matsumaru, Shigenari Hayashi, Toshio Narita
Abstract:A diffusion couple study was carried out with Ni-based superalloy / γ’-Ni3Al with or without a Re-based alloy layer. The Re-based alloy...
285
Authors: Su Gui Tian, Ming Gang Wang, Xing Fu Yu, Xu Dong Lu, Ben Jiang Qian
Abstract:By means of the calculation of the elements diffusion mobility, an investigation has been made into the influence of the elements interaction...
2339
Authors: Yuan Gao, Cheng Lei Wang, Bing Li, Xuan Nan Chen
Abstract:Using plasma alloying technique, Q235 steel was firstly treated by W-Mo-Y Multi-elements co-diffusion followed by plasma nitriding process....
1146
Authors: Tomohiro Sasaki, Takahiro Yagi, Takehiko Watanabe, Atsushi Yanagisawa
Chapter 20: Surface Engineering & Coatings
Abstract:Diffusion treatments of TiAl-based alloys (49.1 at% Al) aluminum coated by thermal spray were carried out at the temperature range of...
2571