Abstract
Ag–Cu–Ti filler alloy incorporated with TiN particles was used to join the Si3N4 ceramic to 42CrMo steel, and the formation mechanism of the joint was revealed using SEM, EDS, XRD and TEM investigations. Microstructural examination showed that TiN + Ti5Si3 reaction layer is adjacent to the Si3N4 ceramic, whereas randomly oriented TiC with grain sizes ranging from 50 to 100 nm form in the 42CrMo/filler reaction layer. The Ag–Cu–Ti brazing alloy exhibits intimate bonding with TiNp, as Ti diffuses towards and enriches around TiNp. A nanometer thin layer of hypostoichiometric TiN1−x is formed at the surface of the particles. Only a small amount of Cu–Ti intermetallic compounds is found in the seam brazed with composite filler of lower TiNp content, whereas various and numerous Cu–Ti intermetallic phases precipitate at higher TiNp content.
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