采用快速甩带技术制备了(Al-10Si-20Cu-0.05Ce)-1Ti(质量分数/％)急冷箔状钎料,并对60％体积分数的SiCp/6063Al复合材料进行真空钎焊实验,然后对钎料及接头的显微组织与性能进行测定和分析.结果表明,急冷钎料的微观组织细小、成分均匀,厚80～90μm,主要包含Al、CuAl2、Si和Al2Ti等相.当升高钎焊温度(T/℃)或延长保温时间(t/min),SiCp/钎料界面的润湿性改善,6063Al基体/钎料间互扩散和溶解作用增强,接头连接质量逐渐提高.当T=590℃、t=30 min时,接头抗剪强度达到112.6MPa;当T=590℃、t=50 min时,少量小尺寸SiCp因液态钎料排挤而分散于钎缝,因加工硬化而使接头强度递增7.3％.然而,当T≥595℃、t≥60 min时,SiCp偏聚于钎缝,导致接头组织恶化,且剪切断裂以脆性断裂为主.综合考虑钎焊成本与接头强度使用要求,确定最佳钎焊工艺为590℃、30 min.
Using (Al-10Si-20Cu-0.05Ce)-1Ti (wt％) filler metal foil prepared by rapidly melt-spun technique,compacted joints of SiCp/6063Al composites with 60％ SiC content were obtained,and then their microstructure and properties were analyzed.Results indicated that the rapidly-cooled foils with thickness of 80-90 μm presented fine and uniform microstructure,and the foils mainly composed of Al,Cu2Al,Si and Al2Ti.With increasing brazing temperature or prolonging soaking time,the bonding quality of joints were gradually improved because of better wettability on the SiCp/filler interface and sufficient interdiffusion and dissolution between 6063Al/filler metal.The shear strength reached 112.6 MPa at 590 ℃ with soaking time of 30 min.When soaking time was prolonged to 50 min,the shear strength increased 7.3％ due to work hardening of a composite seam,which was formed by small-size SiC particles migration and dispersion.However,when brazing temperature was higher than 595 ℃ and soaking time was longer than 60 min,the seam would be deteriorated seriously by segregation of SiC particles and which would lead to brittle fracture Taking both the brazing cost and shearing strength of joint into consideration,the optimum brazing process is determined with temperature of 590 ℃ and soaking time of 30 min.
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