纳米SiO2添加量对Mn-Zn铁氧体显微结构及功耗的影响
Effect of the Amount of Doped Nano-SiO2 on the Microstructure and Power Loss of Mn-Zn Ferrites
作者：毛健(四川大学 材料科学与工程学院,四川 成都610064)；华程(四川大学 材料科学与工程学院,四川 成都610064)；莫红军(四川大学 材料科学与工程学院,四川 成都610064)
Author：(School of Materials Sci. and Eng.,Sichuan Univ.,Chengdu 610064,China)；(School of Materials Sci. and Eng.,Sichuan Univ.,Chengdu 610064,China)；(School of Materials Sci. and Eng.,Sichuan Univ.,Chengdu 610064,China)
收稿日期：2005-08-31 年卷（期）页码：2006,38(1):141-144
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：Mn-Zn铁氧体；纳米SiO2；功耗；显微结构
Key words：Mn-Zn ferrites；nano-SiO2；power loss；microstructure
基金项目：四川宜宾五粮液集团资助项目(04H045)
中文摘要
对添加纳米级SiO2和普通级CaCO3组合对Mn-Zn铁氧体功率损耗的影响进行研究，采用扫描电子显微镜对Mn-Zn铁氧体材料的显微结构、晶界以及元素分布进行观察分析。结果表明，适量的纳米SiO2（与CaCO3组合）掺杂能够改善烧结铁氧体的微观结构并显著降低功率损耗，纳米SiO2添加量应不大于0.005％(wt)，并发现在不同的测试温度下，SiO2添加量有不同的最佳值。在较低温度（≤60 ℃）下，纳米SiO2的最佳添加量为0.0025％(wt)。当材料在较高温度（≥80 ℃）测试时，适宜的纳米SiO2添加量为0.005％(wt)。
英文摘要
The effect of doped nano-SiO2 and CaCO3 on the power loss of Mn-Zn ferrites was investigated，and scanning electron microscopy was used to analyze the microstructure,grain boundary and elements distribution of Mn-Zn ferrites. The results showed that the suitable doped nano-SiO2 with CaCO3 together was able to improve the microstructure of sintered ferrites and reduce the power loss obviously. The amount of doped nano-SiO2 should not be greater than 0.005%(wt), most of the doped Ca and Si were distributed along the grain boundary. Under different test temperature, the optimum content of nano SiO2 had a different value, the suitable content of nano-SiO2 dopants is about 0.0025%(wt) with the test temperature below 60 ℃, while that will be raised up to 0.005%(wt) when the test temperature is above 80 ℃.
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