Joining of SiC ceramic to Ni-based superalloy with functionally gradient material fillers and a tungsten intermediate layer

• Published in: Journal of materials science Vol. 38; no. 19; pp. 4065 - 4070
• Main Authors: Li, Shujie, Zhou, Ying, Duan, Huiping, Qiu, Jianhui, Zhang, Yan
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.10.2003; Springer Nature B.V
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Ceramics; Chemical industry and chemicals; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fillers; Functionally gradient materials; Joining; Joining; welding; Materials science; Materials synthesis; materials processing; Metals. Metallurgy; Nickel base alloys; Physics; Silicon carbide; Stress concentration; Structural ceramics; Superalloys; Technical ceramics; Thermal stress; Thickness; Titanium carbide; Tungsten; Welding; Interlayers; Solid solid interface; Filler material; Fabrication property relation; Ceramic metal contact; Composite material; Non oxide ceramics; Superalloy; Silicon Carbides; Welded joint; Functionnally graded material; Tungsten; Diffusion; Bonding; Nickel base alloys; Mechanical properties; Joining; Self propagating high temperature synthesis; Experimental study; Titanium carbide; Structural ceramic; Transition metal alloy; Nickel; Microstructure; Strength
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1026135220737

Joining of ceramics to metals is of great interest from both technical and economical points of view. SHS welding of SiC ceramic to Ni-based superalloy has been achieved with TiC-Ni functionally gradient materials as filler and a tungsten sheet as an intermediate layer. The obtained welded strength of the welded sample is 60% of the strength of the SiC ceramic measured under the identical conditions. This value is 25% greater than that without the tungsten intermediate layer. Within the range tested in this study, the strength of welded samples increases with increasing thickness of the tungsten layer. The presence of the tungsten intermediate layer can effectively improve the distribution of process-induced thermal stresses in the joints and reduce the concentration of residual thermal stresses in the ceramic near the welding seam. Microstructural study reveals that diffusion takes place at the interfaces, which promotes bonding at the interfaces.