142 活性金属ろうを用いたC/C複合材料とチタン合金との異材間ろう付(溶接・接合のプロセスと評価)

概要

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Carbon-carbon composites were brazed to a pure titanium using a Ag-Cu-Ti filler metal (Cusil-ABA^<[○!R]>) at 830℃ for 60s or 300s in vacuum of 1.0×10^<-4> Torr. The microstructure of the brazed joint interface was observed through the optical microscope and the scanning electron microscope (SEM). By analyzing with the energy dispersive spectroscopy (EDS), the constituents' distribution at the brazed interface was measured. Those observations and analyses revealed that the yarns of C/C composites were disbanded into the carbon fibers, and that the carbon fibers were corroded. The titanium included not only in the brazing filler metal but also in the bulk metal which diffused into the molten brazing filler metal formed the carbide to corrode the C/C composites. The corrosion was more severe for the brazed joint made by a longer brazing time. These results suggest that the brazing time must be shorter to obtain the stronger brazed joint for C/C composites and titanium.
一般社団法人日本機械学会の論文
2009-11-06