摘要
采用等原子比Ti-Ni复合箔对C/SiC复合材料与Nb进行了真空反应钎焊,研究了焊前C/SiC表面状态对接头界面组织和力学性能的影响.结果表明,线切割态的C/SiC与Nb的接头界面(Ti,Nb)C反应层呈现锯齿状,而抛光和砂纸打磨状态的C/SiC接头界面处的反应层平直.锯齿状的界面反应层降低了界面处的应力集中程度,有助于提高接头的力学性能,使得线切割态的C/SiC与Nb的接头强度明显高于抛光和打磨状态的接头,达到188MPa.线切割态的C/SiC与Nb的接头断裂同时发生在C/SiC母材、界面和钎缝中,而抛光和打磨状态的C/SiC与Nb的接头断裂主要发生在界面处.
C/SiC composites and Nb were brazed with equiatomic ratio Ti-Ni composite foils in vacuum,and the effects of surface state of C/SiC composites on the microstructure and property of the brazing joints were investigated.The results showed that the (Ti,Nb)C reaction layer between C/SiC and filler metal in the brazing joint was serrate when the C/SiC surface state was cut by the electric spark linear cutting machine,but the (Ti,Nb)C layers were both flat when the surface of C/SiC were polished and sanded before brazing.The serrate reaction layer decreased the stress concentration at the C/SiC-filler metal interface and was benefit for the joint.The shear strength of brazing joints of Nb and C/SiC at spark cutting state reached 188 MPa,which is much higher than that at polishing and sanding states.The fracture of brazing joints of Nb and C/SiC at spark cutting state took place at C/SiC base material,C/SiC-filler metal interface and filler metal,but that of the other two kinds of joints mainly occurred at the C/SiC-filler metal interface.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2010年第10期31-34,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50705022)
