(State Key Laboratory of Solidification Processing, C/C Composites Technology Research Center, Northwestern Polytechnical University, Xian 710072, China)
Keywords:
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CLC:
PACS:
TB332
DOI:
10.7502/j.issn.1674-3962.2013.11.5
DocumentCode:
Abstract:
C/C composites and Nickle-based superalloy GH3044 were brazed at 1180 ℃ for 30 min using the Ni71CrSi filler as interlayer. The wettability of filler on the surface of C/C composites and SiC modified C/C composites was studied. The chemical element distribution, microstructure, shear strength and hardness distribution of the joint between C/C composites and GH3044 were investigated by scanning electron microscopy, energy-dispersive spectrometry, material universal testing machine and Micro-indentation instrument, respectively. Results showed that the joint without SiC coating got failed during the brazing process. Ni71CrSi can well braze Nickle-based superalloy and C/C composites with SiC coating. The shear strength of joint with SiC coating at room temperature was up to 35.08 MPa. The joint exhibited pseudo-plastic fracture behavior. Mechanism analysis indicated that this filler could wet modified C/C composites well. The hardness distribution of the joint presented a trend with high value at the middle and low value at the both sides, and the interface structure of joints was: C/C composites with SiC coating/Ni(s.s)+Cr7C3+Ni3Si/Ni(s.s)+Cr3C2+Ni3Si/Ni(s.s)+Cr3C2+MC+Ni3Si/Ni3Si+ MC +Ni(s.s)/GH3044。