Istituto di Scienze Marine     
Esposito L., Sciti D., Silvestroni L., Melandri C., Guicciardi S., Saito N., Nakashima K., Glaeser A. Transient liquid phase bonding of HfC-based ceramics. In: Journal of Materials Science, vol. 49 pp. 654 - 664. Springer, 2014.
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 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 lm 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.
DOI: 10.1007/s10853-013-7746-2
Subject joininig
advanced ceramics

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