高频MnZn功率铁氧体烧结工艺研究  

A Study of Sintering of High Frequency MnZn Power Ferrite

作　　者：余忠[1] 兰中文[1] 王京梅[1] 张益栋[1] 王豪才[1] 

机构地区：[1]电子科技大学微电子与固体电子学院,成都610054

出　　处：《材料导报》2003年第12期80-82,共3页Materials Reports

基　　金：国防科技预研项目资助

摘　　要：按照氧化物陶瓷工艺对高频MnZn功率铁氧体烧结工艺条件进行了研究。烧结温度越高,晶粒越大,晶界越薄,电阻率越低,磁芯损耗越大,起始磁导率和烧结密度分别在1240℃和1230℃达到最大值。延长保温时间,可以使晶粒充分生长,晶界变薄,电阻率减小,损耗增大。保温3h后,起始磁导率和烧结密度均可达到最大值。氧分压越低,材料起始磁导率越高,电阻率越小,损耗越大,但氧分压低于5％后烧结密度不再继续增加。In this work , the effect of sintering conditions such as sintering temperature, sintering time and oxygen pressure on the magnetic properties of MnZn power ferrite was studied by the conventional ceramic process. With increasing sintering temperature, the crystalline grain grew .the grain boundary became thinner, and the grain, boundary resistivity decreased, leading to an increased power loss. The initial permeability and density reached their peak value at 1240℃ and 1230℃,respectively. By prolonging sintering time,the grain boundary tended to become thinner and the grain boundary resistivity decreased,resulting in an increase in power loss,and the initial permeability and density attained their maximum after 3-hour sintering. With a declining oxygen pressure,the initial permeability increased, and decreasing grain boundary resistivity led to an increase in power loss. When the oxygen pressure dropped below 5% ,the density of power ferrite stopped increasing.

关 键 词：高频MnZn功率铁氧体材料 烧结工艺 磁导率 烧结密度 电阻率 

分 类 号：TM277[一般工业技术—材料科学与工程]