Microstructure and corrosion behaviour of brazed joints of SiCf/SiC composites and Hastelloy N alloy using Cu-Ni alloy
SiC fibers reinforced SiC ceramic matrix composites were brazed to Hastelloy N alloy using Cu-2.67Ni(wt.%)alloy.Microstructure evolution and corrosion behaviour of joints were characterized by scanning electron microscopy(SEM)with energy-dispersive X-ray spectroscopy(EDS)and inductive coupled plasma atomic emission spectrometry(ICP-AES).Sound joint was obtained at 1130 ℃ for 10 min.Alloy elements,e.g.Ni,Cr and Mo,diffused from Hastelloy N Alloy into Cu-Ni joint seam.Cr element enriched near the interface between SiC composites and joint alloy to form discontinuity interlayer.Higher temperature contributed to both the diffusion process and the erosion of SiC by Ni,and lower temperature would lead to the incomplete fusion of brazing fillers.The diffusion of elements during brazing changed the composition of joint seam and Hastelloy N alloy,which caused the deterioration of corrosion resistance of alloy.The selective corrosion of Cr and Si might be resulted in the corrosion of both joint seam and alloy.
SiCf/SiC composites Hastelloy N alloy Cu-Ni alloy Brazing joint FLiNaK salt Corrosion behaviour
Hongda Wang Qian Feng Haijun Zhou Jianbao Hu Yanmei Kan Shaoming Dong
State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Donghua University,Shanghai 201600,China State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of
国际会议
沈阳
英文
369-380
2017-09-26（万方平台首次上网日期，不代表论文的发表时间）