C/C复合材料与镍基高温合金GH3128钎焊

Brazing of C/C composite and Ni-based high temperature alloy GH3128

摘要: 在连接温度为1 170 ℃、保温时间为60 min的条件下,采用BNi2钎料对C/C复合材料和GH3128进行真空钎焊. 利用扫描电镜、能谱仪和X射线衍射仪对接头的界面组织及断口形貌进行分析. 结果表明,在钎焊过程中,Cr原子向C/C 复合材料侧聚集,并与C原子发生反应生成Cr₃C₂,改善了BNi₂钎料对C/C 复合材料的润湿性,从而实现了C/C复合材料与镍基高温合金GH3128的良好结合;C/C复合材料/BNi2/GH3128钎焊接头区域生成Cr₃C₂,MC,M₃Ni₂Si,Cr₇C₃,MB等反应产物. 接头的断裂位置发生在靠近C/C复合材料的焊缝区域,接头的抗剪强度为24 MPa.

Abstract: C/C composite and GH3128 have been vacuum brazed with BNi2 at 1 170 ℃ for 60min. The microstructure of the joint and the fracture surface were analyzed by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results show that Cr atom aggregated and reacted with C forming Cr₃C₂ at the side of C/C composite, which improved the wettability of BNi2 on C/C composite. Thus the metallurgical bonding of C/C and GH3128 were achieved at the bonding zone. Cr₃C₂, MC, M3Ni2Si, Cr₇C₃ and MB formed in the brazed joint. The joint failed at the brazing zone near C/C composite, and the shear strength of the joint was 24 MPa.