Diffusion bonding of (Hf0.2Zr0.2Ti0.2Ta0.2Nb0.2)C high-entropy ceramic with metallic Ni foil |
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| Affiliation: | 1. Queen Mary University of London, School of Engineering and Materials Science, Mile End Rd., London E1 4NS, UK;2. Institute of Plasma Physics of the Czech Academy of Sciences, Za Slovankou 3, 182 00 Prague, Czechia;3. Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38122 Trento, Italy;4. Faculty of Materials Science and Technology, VŠB – Technical University of Ostrava, 7.listopadu 15, 708 33 Ostrava – Poruba, Czech Republic |
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| Abstract: | To prepare large-sized and complex-shaped components, the feasibility of direct diffusion bonding of (Hf0.2Zr0.2Ti0.2Ta0.2Nb0.2)C high-entropy ceramic (HEC) and its diffusion bonding with a metallic Ni foil was investigated, and the interfacial microstructure and mechanical properties of HEC/HEC and HEC/Ni/HEC joints were analyzed. For the direct diffusion bonding, reliable joints with a shear strength of 146 MPa could be achieved when the bonding temperature reached 1500 °C under a pressure of 30 MPa. By introducing a metallic Ni foil as the interlayer, the HEC was successfully bonded at the diffusion temperatures from 1150 °C to 1250 °C under 10 MPa through the formation of Ti2Ni compound phase. Meanwhile, the HEC(Ni) phase formed by the diffusion of Ni into HEC and Ni(s, s) bulks precipitated in the bonding transition zone. The maximum joint shear strength of 151 MPa was obtained by optimizing the Ni-foil thickness, bonding temperature, and holding time. |
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| Keywords: | High-entropy ceramic Diffusion bonding Interfacial microstructure Mechanical properties |
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