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利用初始导磁率ui=40的镁锌铁氧体材料试制彩电用φ4×6电感线圈磁芯,应用标准陶瓷工艺,在配方中加入少量的Co~(+2)离子及微量的Ca~(+2)离子,可使试制样品的品质因素Q提高20％左右。高温预烧可使材料的具有高饱和磁感应强度(Bs);将配方中Fe_2O_3,含过量的SiO_2、杂质Si~(+2)赶在晶界,减少晶格畸变;同时提高晶界电阻率p,进一步加强Co~(+2)离子对畴壁的钉扎作用,从而获得样品的高Q值。与此同时,由于高温预烧,材料收缩率减少,烧结温区变宽,可获得较高的合格率,便于大规模生产。样品出炉放置120小时后,其Q值可增加20％,究其原因,认为是Co~(+2)离子扩散充分,材料内部磁矩稳定的结果,使试制样品性能赶上了日本同类产品的水平。
Magnesium-zinc ferrite materials with initial magnetic permeability ui = 40 were used to manufacture the φ4 × 6 inductor core of color TV. By using standard ceramic technology, a small amount of Co ~ (+2) ions and trace amount of Ca ~ (+ 2) ions, the quality factor Q of the prototype can be increased by about 20%. High temperature pre-calcination can make the material have a high saturation magnetic induction (Bs); the recipe Fe_2O_3, containing excess SiO_2, impurities Si ~ (+2) catch up in the grain boundary, reducing lattice distortion; while increasing the grain boundary resistivity p , To further strengthen the Co ~ (+2) ions on the wall of the pinning effect, so as to obtain high Q value of the sample. At the same time, due to high temperature calcination, material shrinkage decreased, the broadening of the sintering temperature range, access to a higher pass rate, ease of mass production. After 120 hours, the Q value of the sample can be increased by 20%. The reason is that the diffusion of Co ~ (+2) ions is sufficient and the magnetic moment inside the material is stable, so that the performance of the prototype can catch up with that of similar products in Japan Level.