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Journal of Materials Science

, Volume 29, Issue 16, pp 4404–4414 | Cite as

AEM investigation of ceramic/lncoloy 909 diffusional reactions after joining by HIP

  • R. Larker
  • L. -Y. Wei
  • B. Loberg
  • M. Olsson
  • S. Johansson
Papers

Abstract

Diffusion bonding by hot isostatic pressing (HIP) was performed between Incoloy 909 and five different ceramics. Two of the ceramics were composites made from powder mixtures of Si3N4 and either 60 vol% TiN or 50 vol% TiB2, while three were monolithic materials, namely Si3N4 with 2.5 wt% Y2O3 as a sintering additive, Si3N4 without additives, and Si2 N2O without additives. A diffusion couple geometry was developed to facilitate the preparation of thin-foil specimens for examination by analytical electron microscopy (AEM). Diffusion bonding was performed by HIP at 927°C (1200K) and 200 MPa for 4 h. The formation of reaction layers was very limited, being less than 1 μm in total layer thickness. Two reaction products were found by AEM; a continuous, very thin, (⩽100 nm) layer of fine TiN crystals at the initial ceramic/metal interface, and larger grains extending about 100–500 nm into the superalloy and forming a semi-continuous layer of a G-phase suicide containing mainly nickel, silicon and niobium.

Keywords

Nickel Niobium Y2O3 Powder Mixture Diffusion Couple 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • R. Larker
    • 1
  • L. -Y. Wei
    • 1
  • B. Loberg
    • 1
  • M. Olsson
    • 2
  • S. Johansson
    • 2
  1. 1.Division of Engineering MaterialsLuleå University of TechnologyLuleåSweden
  2. 2.Department of Materials ScienceUppsala UniversityUppsalaSweden

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