OS1735 C/C複合材とNI基合金の応力緩和層を用いたろう付

抄録

C/C composites plate was brazed to Ni-based alloy, Inconel-600 plate using Fe-Cr-Ni-(Si,P) brazing filler metal with various thickness of Nb foil inserted. Niobium foil was solved into the brazing filler layer and precipitated along the C/C composites' surface. Although, Nb layer remained in the brazed interface was thinner than the original Nb foil thickness, it acted as the stress relief layer. The shear strength of brazed joint varied with the remained Nb layer's thickness. The shear strength increased for the brazed joint with 100μm of Nb layer, but once dropped for the joint with 200μm. The FEM analysis revealed that the shear strength of brazed joint monotonously increase with Nb layer's thickness. The microstructure in the brazing filler layer was considered to contribute to the tendency of the shear strength with Nb layer thickness.