http://www.cnr.it/ontology/cnr/individuo/prodotto/ID293003
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)
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- 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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