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本文通过电镜观察和电子计算机运算,标定了高纯电容铝箔经不同温度淬火后残留杂质化合物的成分和结构,同时研究了电阻率、显微硬度随热处理条件而变化的规律。TEM观察表明:500℃/5min淬火后,残留化合物有FeAl_6、FeAl_3,α-AlFeSi和其它杂质粒子。500℃/min淬火后,残留化合物有(AlFeSi)T相粒子和其它杂质粒子。600℃/5min淬火,没有杂质粒子存在。由电阻率和显微硬度的变化规律说明,杂质粒子在淬火过程中发生溶解。完成溶解过程所需要的时间随淬火温度上升而缩短,在500℃时约15min,550℃时约10min,600℃时约5min。杂质的存在状态对铝箔比电容影响很大。SEM观察表明:杂质以第二相粒子形式存在将造成腐蚀不均,比电容下降。杂质固溶于铝基体中,腐蚀不均现象可以避免或减弱,比电容上升。
In this paper, the composition and structure of residual impurities compounds of high-purity aluminum foil after being tempered at different temperatures were calibrated by electron microscopy and computer calculation. The laws of resistivity and microhardness with the heat treatment conditions were also studied. TEM observation shows that the residual compounds are FeAl_6, FeAl_3, α-AlFeSi and other impurity particles after quenching at 500 ℃ for 5min. After quenching at 500 ° C / min, residual compounds are (AlFeSi) T phase particles and other impurity particles. 600 ℃ / 5min quenching, there is no impurity particles. The variation of resistivity and microhardness shows that the impurity particles dissolve in the quenching process. The time required to complete the dissolution process is shortened as the quenching temperature increases, about 15 min at 500 ° C, about 10 min at 550 ° C, and about 5 min at 600 ° C. The presence of impurities on the foil than the capacitance of a great influence. The SEM observation shows that the impurities present in the form of second phase particles will cause uneven corrosion and lower specific capacitance. Impurity solid solution in the aluminum matrix, uneven corrosion can be avoided or reduced, the specific capacitance increased.