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采用含苯并恶嗪单元的双邻苯二甲腈树脂(BZ-BPH)粘接经过处理表面为新鲜铝合金层及氧化物的铝合金基片,对粘接样的室温及高温热处理后(400℃,30 min)的拉伸性能进行了测试并采用SEM观察了断面的形貌。以上述表面不同的2种铝合金粉体为模型,采用差热扫描(DSC)研究了不同界面对BZ-BPH固化反应的影响。研究结果表明,表面为氧化物的试片室温力学性能远大于表面为铝合金的试片;经过高温热处理后,后者的拉伸剪切强度有较大提高,而前者稍有降低,这表明BZ-BPH具有较好的高温粘接性能。
BZ-BPH with benzoxazine units was used to bond aluminum alloy substrate with fresh aluminum alloy layer and oxide on the treated surface. After heat treatment at room temperature and high temperature ( 400 ℃, 30 min) tensile properties were tested and the morphology of the section was observed by SEM. The effects of different interfaces on the curing reaction of BZ-BPH were investigated by differential scanning calorimetry (DSC) using the above two different aluminum alloy powders as the models. The results show that the mechanical properties at room temperature of the specimen with the oxide surface are much larger than that of the specimen with the surface of the aluminum alloy. After high temperature heat treatment, the tensile shear strength of the latter increases a little while the former decreases slightly BZ-BPH has good high temperature adhesive properties.