以Ni71CrSi为中间层在1180℃×30 min 的钎焊条件下，对 C/C 复合材料和镍基高温合金进行钎焊试验。研究了Ni71 CrSi对C/C复合材料和表面 SiC改性的 C/C复合材料的润湿性。利用扫描电子显微镜、能谱分析仪、万能试验机和微米压痕仪分别对接头的界面组织、显微硬度和剪切断裂过程进行了研究。结果表明，表面未改性的 C/C 复合材料在连接过程中直接失效，而表面SiC改性的 C/C复合材料与镍基合金的接头连接良好，且接头剪切强度达到35.08 MPa，断裂方式呈假塑性断裂。机理分析表明，镍基钎料较好地润湿表面SiC改性的C/C复合材料，接头的显微硬度分布呈中间高两边低的变化趋势，且形成了表面改性C/C/Ni（s.s）＋Cr7C3＋Ni3Si/Ni（s.s）＋Cr3C2＋Ni3Si/Ni（s.s）＋Cr3C2＋MC ＋Ni3Si/Ni3Si ＋MC ＋Ni （ s.s）/GH3044界面结构。
C/C composites and Nickle-based superalloy GH3044 were brazed at 1 180 ℃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 stud-ied.The microstructure, microhardness and shear fracture of the joint between C/C composites and GH3044 were investi-gated by scanning electron microscopy, energy-dispersive spectrometry, material universal testing machine and Micro-in-dentation 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 analy-sis 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 interfacial structure of joints was:C/C com-posites with SiC coating/Ni( s.s) +Cr7 C3 +Ni3 Si/Ni( s.s) +Cr3 C2 +Ni3 Si/Ni( s.s) +Cr3 C2 +MC+Ni3 Si/Ni3 Si+MC+Ni( s.s)/GH3044.
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