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  • 1.
    Larker, Richard
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Anevik, K.
    Luleå University of Technology.
    Kristiansson, S.
    Loberg, Bengt
    Luleå University of Technology.
    Heat treatments of the low-expansion superalloy Incoloy 909 for application in ceramic/metal joints and in metal matrix composites1992In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 13, no 1, p. 11-15Article in journal (Refereed)
    Abstract [en]

    Increasing efficiency demands on gas turbines have promoted the development of superalloys with low thermal expansion up to intermediate temperatures, to reduce the need of cooling for preservation of efficient clearances between rotating and stationary parts. These materials are also of prime interest for joins to engineering ceramics such as silicon nitride and silicon carbide, and as a matrix with W or SiC fibres in metal matrix composites (MMC). The paper deals with the thermomechanical and microstructural stability of Incology 909 during possible joining and densification treatments. Thermal expansion behaviour and joining/densification temperatures suitable for retaining the desired structure of the superalloy are presented.

  • 2.
    Larker, Richard
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Luleå tekniska universitet.
    Loberg, Bengt
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Diffusion reactions between silicon oxynitride and silicon nitride during HIP-synthesis1988In: Journal de Physique. Colloque, ISSN 0449-1947, Vol. 49, no C-5, p. 219-225Article in journal (Refereed)
    Abstract [en]

    Solid state bonding by diffusion reactions is an attractive route to achieve joints that retain strength at high temperature. Intimate physical contact across the joint during bonding is important for the diffusion process. Hot isostatic pressing (HIP) can enhance the contact and thus produce a stronger joint at a lower bonding temperature than other methods. Silicon oxynitride synthesized from a stoichiometric mixture of silicon nitride and silicon oxide by HIP has some interesting properties that might be useful as an intermediate layer in bonding silicon nitride to metals. This work is a part of an assessment to develop solid state bonding methods for the joining of silicon nitride to superalloys by HIP. It presents the first steps in the development, namely the optimization of the synthesis of pure silicon oxynitride during densification by HIP and joining of the oxynitride to silicon nitride during synthesis and densification by HIP. The achievements in these areas and the direction of future work are discussed

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