(1. 天津大學(xué) 天津市現(xiàn)代連接技術(shù)重點(diǎn)實(shí)驗(yàn)室，天津 300072；
2. 天津大學(xué) 材料科學(xué)與工程學(xué)院，天津 300072)
摘 要: 在不添加釬料的情況下，使用添加4%ZnCl2和4%SnCl2(質(zhì)量分?jǐn)?shù))的中溫CsF-AlF3自反應(yīng)釬劑，對(duì)成型法制備的鋁蜂窩芯及面板進(jìn)行自反應(yīng)釬焊連接。通過(guò)調(diào)整釬焊溫度、保溫時(shí)間等參數(shù)，確定鋁蜂窩板的自反應(yīng)釬焊工藝。使用光學(xué)顯微鏡和掃描電子顯微鏡及能譜儀對(duì)釬焊接頭進(jìn)行組織觀察和成分與缺陷分析，測(cè)試釬焊接頭在不同試驗(yàn)溫度下的拉剪強(qiáng)度以及蜂窩板的平壓強(qiáng)度。結(jié)果表明：釬焊溫度為570 ℃、保溫時(shí)間30 min時(shí)，可制備出整體的鋁蜂窩板，且釬焊接頭連接良好，未出現(xiàn)溶蝕缺陷；蜂窩芯接頭的拉剪強(qiáng)度為46~52 MPa，在25~150 ℃范圍內(nèi)，拉剪強(qiáng)度無(wú)明顯下降，自反應(yīng)釬焊制備的鋁蜂窩板平壓強(qiáng)度可達(dá)1.75 MPa。
關(guān)鍵字: 自反應(yīng)釬焊；鋁蜂窩；拉剪強(qiáng)度；平壓強(qiáng)度
（1. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China;
2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China）
Abstract:Aluminum honeycombs prepared by molding method were bonded by self-brazing using the self-brazing CsF-AlF3 flux added with 4% ZnCl2 and 4% SnCl2 (mass fraction) under condition without filler metal. The influences of the brazing temperature and brazing time on the interface microstructure and the aluminum honeycomb properties were investigated. The interface microstructure, chemical compositions and defects of the self-brazing joints were observed and analyzed by scanning electron microscopy and energy dispersive spectroscopy (EDS). The results show that, when the brazing temperature is 570 ℃ and the brazing time is 30 min, the self-brazing can realize the bonding of aluminum honeycomb panels using brazing composite sheet as face panels. The joints are soundly bonded and no corrosions appear, the tensile-shear strength of the brazing joints of honeycomb core is 46-52 MPa, which doesn’t significantly decrease when tested under high temperature conditions，and the average compression strength of the aluminum honeycomb panels is 1.75 MPa.
Key words: self-brazing; aluminum honeycomb; tensile-shear strength; compression strength
