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选用高频磁特性好,机械强度及精密性能均佳的热压镍锌铁氧体作磁头铁心材料,并对其制造工艺上的主要因子进行了深入研究。 主要因子有:原料的化学组成和添加物,原料粉末的粒度、热压的温度、压力、气氛和时间。通过实验,弄清了它们对材料的致密化和结晶组织各自的影响。 实验表明氧化铜作为促进材料致密化的添加物是有效的用添加约10％Cuo的Ni-Zn铁氧体材料,以1200～1250℃及100～200Kg/Cm~2,在空气中热压烧结2～4小时,可以获得近于单晶的致密陶瓷。将晶粒直径为20～30μ的材料做小形精密磁头铁心,采用玻璃接缝技术。实验给出了极为满意的结果。
Selection of high frequency magnetic properties, mechanical strength and precision performance are good for hot-rolled nickel-zinc ferrite core material for the head, and its manufacturing process of the main factors in-depth study. The main factors are: the chemical composition of raw materials and additives, particle size of raw materials, hot pressing temperature, pressure, atmosphere and time. Through experiments, we have clarified their influence on the densification and the crystalline structure of the material. Experiments have shown that copper oxide is effective as an additive to promote densification of the material by hot press sintering in air at 1200-1250C and 100-200 kg / cm2 using a Ni-Zn ferrite material added with about 10% Cuo 2 to 4 hours, you can get close to single-crystal dense ceramics. The grain diameter of 20 ~ 30μ material made of small precision magnetic core, the use of glass seams. The experiment gave very satisfactory results.