Diffusion bonding of Ti3AlC2 ceramic via a Si interlayer

• Published in: Journal of materials science Vol. 42; no. 17; pp. 7081 - 7085
• Main Authors: Yin, X. H, Li, M. S, Li, T. P, Zhou, Y. C
• Format: Journal Article
• Language: English
• Published: Heidelberg Kluwer Academic Publishers-Plenum Publishers 01-09-2007; Springer; Springer Nature B.V
• Subjects: Applied sciences; Bond strength; Bonded joints; Bonding strength; Building materials. Ceramics. Glasses; Ceramic bonding; Ceramic industries; Ceramics; Chemical industry and chemicals; Cross-disciplinary physics: materials science; rheology; Diffusion layers; Diffusion welding; Exact sciences and technology; Interlayers; Joining; welding; Materials science; Materials synthesis; materials processing; Mechanical properties; microstructure; Miscellaneous; Modulus of rupture in bending; Phase composition; Physics; scanning electron microscopy; Silicon; Solid solutions; Technical ceramics; Titanium aluminides; X-ray diffraction; Interlayers; Scanning electron microscopy; Electron microprobe; Joining; Aluminium carbide; Experimental study; X ray diffraction; Titanium carbide; Non oxide ceramics; Interface structure; Interface properties; Lamellar structure; Aluminium Titanium Carbides Mixed; Technical ceramics; Chemical diffusion; Bonding
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-006-1491-8

Based on the structure characteristic of Ti₃AlC₂ and the easy formation of Ti₃Al₁ ₋ ₓ SiₓC₂ solid solution, a Si interlayer was selected to join Ti₃AlC₂ layered ceramic by diffusion bonding method. Joining was performed at 1,300–1,400 °C for 120 min under 5 MPa load in an Ar atmosphere. The phase composition and interface microstructure of the joints were investigated by XRD, SEM and EPMA. The results revealed that Ti₃Al(Si)C₂ solid solution formed at the interface. The mechanism of bonding is attributed to silicon diffusing inward the Ti₃AlC₂. The strength of joints was evaluated by a 3-point bending test. The jointed specimens exhibit a high flexural strength of 285 ± 11 MPa, which is about 80% of that of the Ti₃AlC₂; and retain this strength up to 1,000 °C. The high mechanical performance of the joints indicates that diffusion bonding via a Si interlayer is effective to bond Ti₃AlC₂ ceramic.