Fe-Si-B非晶带材高温氧化行为及回收工艺

Oxidation behavior and recycling process of Fe-Si-B amorphous ribbon

为了减少回收过程Fe78Si9B13非晶带材的氧化烧损,研究了Fe78Si9B13非晶带材的高温氧化行为。结果表明,Fe78Si9B13非晶带材高温氧化与升温速率有关,以5及10K/min从室温升至1 223K氧化增重分别为44%和31%;截面形貌显示试样与大气接触面存在质地疏松有少量微裂纹的氧化层;XRD分析出氧化层含大量Fe2O3和少量SiO2。氧化动力学曲线显示,试样在1 073和1 173K下5h内氧化增重遵循直线规律,之后遵循抛物线规律,而在1 273K下只遵循直线规律,且氧化速度非常快,12min氧化增重40%。通过降低炉气温度、压缩打包过程废带及不合格品以及吹氩减少炉内氧气分压可减少非晶带材回收过程的氧化增重,最终使回收1kg废带所产生的炉渣减少至9~10g,合金液Si的原子分数提高至8.9%。

In order to reduce the oxidative burning loss of Fe78 Si9 B13 amorphous ribbon in the recovery process,the oxidation behavior of Fe78 Si9 B13 amorphous ribbon was studied.The results show that the oxidation of Fe78 Si9 B13 amorphous ribbon at high temperature is related to the heating rate.The oxidation weight gain of Fe78 Si9 B13 amorphous ribbon at 5 and 10 K/min from room temperature to 1 223 Kare 44%and 31%respectively.There is an oxide layer with loose texture and a small amount of microcrack at the interface between the sample and atmosphere by SEM.The oxide layer contains a large amount of Fe2 O3 and a little SiO2 by XRD.Oxidation kinetics curve shows that the oxidation weight gain of the samples follows a linear rule within 5 hours at 1073 and 1 173 K,then a parabolic rule.At 1 273 K,however,it only follows a linear rule,meanwhile the oxidation speed is very fast,with the oxidation weight gain reaches 40%in 12 min.The oxidation weight gain in the amorphous ribbon recycling process can be reduced through cutting down the furnace gas temperature,compressing the waste ribbon and unqualified products in the packaging process and blowing argon to reduce the partial pressure of oxygen in the furnace.Thus the slag decreases to 9-10 g when 1 kg waste ribbon is recovered,and the Si content of liquid alloy increases to 8.9%.