升温速度和气氛对MnZn铁氧体材料烧结性能的影响

采用传统氧化物陶瓷工艺制备MnZn铁氧体材料,研究900～1200℃升温段升温速度和气氛对材料性能的影响。结果表明,适当提高升温速度可以增大晶粒尺寸和烧结密度,降低功耗。但升温过快会导致晶粒间气孔增大,尺寸过大,同时晶粒均匀性变差,性能恶化。此升温段氧分压升高会导致固相反应和致密化过程变慢,最终烧结材料的磁导率、密度降低。但高氧气氛也导致Fe2+减少,电阻率升高,80～120℃功耗有所降低。

The influence of heating rate and sintering atmosphere on the magnetic property of MnZn ferrite

MnZn ferrite materials were prepared via oxide ceramic process,and the influence of heating rate and sintering atmosphere (mainly during 900 to 1200 ℃) on their magnetic property was investigated.It shows that proper elevation of heating rate could enlarge the grain size and increase sintering density,and the power loss was reduced.However,over high heating rate would increase the size of intra-granular pores and deteriorate the uniformity of grain size.Thus magnetic property of sintering product was also deteriorated.Increase in oxygen pressure of sintering atmosphere would hinder solid reaction and densification process,and decrease initial permeability and sintering density.Meanwhile,high oxygen pressure also reduces the amount of Fe^2+ of sintered product,which increases the resistivity and reduces the power loss at 80-120 ℃.