Diffusion bonding of (Hf0.2Zr0.2Ti0.2Ta0.2Nb0.2)C high-entropy ceramic with metallic Ni foil. Issue 15 (December 2021)

• Record Type: Journal Article
• Authors: Mu, R.J.; Yang, Z.W.; Niu, S.Y.; Sun, K.B.; Wang, Y.; Wang, D.P.
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 15(2021)
• Page Start: 7478
• Page End: 7487
• Publication Date: 2021-12
• Subjects: High-entropy ceramic -- Diffusion bonding -- Interfacial microstructure -- Mechanical properties; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.08.048
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: To prepare large-sized and complex-shaped components, the feasibility of direct diffusion bonding of (Hf0.2 Zr0.2 Ti0.2 Ta0.2 Nb0.2 )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 Ti2 Ni 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.