Transient liquid phase bonding of HfC-based ceramics (Articolo in rivista)

Type
Label
  • Transient liquid phase bonding of HfC-based ceramics (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s10853-013-7746-2 (literal)
Alternative label
  • Esposito, Laura; Sciti, Diletta; Silvestroni, Laura; Melandri, Cesare; Guicciardi, Stefano; Saito, Noritaka; Nakashima, Kunihiko; Glaeser, Andreas M. (2014)
    Transient liquid phase bonding of HfC-based ceramics
    in Journal of materials science
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Esposito, Laura; Sciti, Diletta; Silvestroni, Laura; Melandri, Cesare; Guicciardi, Stefano; Saito, Noritaka; Nakashima, Kunihiko; Glaeser, Andreas M. (literal)
Pagina inizio
  • 654 (literal)
Pagina fine
  • 664 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 49 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 11 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 2 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR ISTEC; CNR ISMAR; Kyushu University; University of California Berkeley (literal)
Titolo
  • Transient liquid phase bonding of HfC-based ceramics (literal)
Abstract
  • Transient liquid phase (TLP) bonding enables joining at lower temperatures than traditional bonding techniques and preserves the potential for high-temperature applications, making it particularly attractive for joining ultra-high-temperature ceramics (UHTCs) such as carbides and borides. The feasibility of a TLP joint between \"pure\" carbides has been recently demonstrated. The present study examines the interactions that occur between undoped HfC or MoSi2-doped HfC and a Ni/Nb/Ni multilayer interlayer during TLP bonding. Bonding is performed at 1400 degrees C for 30 min in a high-vacuum furnace. SEM-EDS characterization shows that the reaction layer formed at the interlayer/ceramic interface contains mixed carbides and depending upon the ceramic, Ni-Nb-Hf, or Ni-Nb-Hf-Si, or Ni-Nb-Si alloys. Nanoindentation tests traversing the reaction layer between the bulk ceramic and Nb foil midplane also show a clear transition zone across which the indentation modulus and hardness vary. Crack-free joints have been obtained with undoped HfC. The addition of 5 vol% MoSi2 introduces small (<5 mu m long) isolated cracks within the reaction layer, whereas with 15 vol% MoSi2 added, cracking was pervasive within the reaction layer. When the reaction layer exceeds a critical thickness, as in the case of the bond obtained with HfC doped with 15 vol% MoSi2, residual stresses become sufficiently large to cause extensive cracking and bond failure. The results suggest a need to characterize and balance the positive role of additives on sintering with the potentially deleterious role they may have on joining. (literal)
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