阅读说明：本技术 一种软磁铁氧体粉末制备方法及叠层片式电感器制备方法 (Preparation method of soft magnetic ferrite powder and preparation method of laminated inductor ) 是由 郭皓 黄刚 彭长宏 于 2018-08-17 设计创作，主要内容包括：本发明提供了一种在较低温度下制备具有优良烧结性的Ni-CuZn铁氧体粉末的方法以及由上述铁氧体粉末制备叠层片式电感器的方法。铁氧体粉末的制备方法是以铁、镍、铜、锌为主要组分的软磁铁氧体粉末的制备方法,包括将有机添加剂存在于含有起始粉末和WAT的煅烧产物的浆料中的步骤。ER,其中有机添加剂是具有羟基和羧基的有机化合物或其中和盐或内酯,或者有机添加剂是具有羟甲基羰基的有机化合物,具有烯醇型羟基可分解的有机化合物。S是酸或其盐。(The present invention provides a method for preparing a Ni-CuZn ferrite powder having excellent sinterability at a relatively low temperature and a method for preparing a laminated chip inductor from the ferrite powder. The ferrite powder is prepared by a process for preparing a soft magnetic ferrite powder having iron, nickel, copper and zinc as main components, comprising the step of presenting an organic additive in a slurry containing a starting powder and a calcined product of WAT. ER, wherein the organic additive is an organic compound having a hydroxyl group and a carboxyl group or a neutralized salt thereof or a lactone, or the organic additive is an organic compound having a hydroxymethylcarbonyl group, having an enol-type hydroxyl-decomposable organic compound. S is an acid or a salt thereof.)

1. A method for preparing soft magnetic ferrite powder and a method for preparing a laminated chip inductor are characterized in that: comprises mixing an organic additive with water, calcining the resultant including Ni-Cu, Zn ferrite to form a slurry, drying the slurry, and preparing a soft magnetic ferrite powder including iron, nickel, copper and zinc as a main component. The organic additive is an organic compound having a hydroxyl group and a carboxyl group or a neutralized salt thereof or a lactone, or the organic additive is an organic compound having a hydroxymethylcarbonyl group, an organic compound having an enol-type hydroxy DIS. The slurry contains Fe ions and Cu ions derived from the calcined product and has a total content of Fe ions and Cu ions of 0.005 to 2% by weight based on the calcined product; the slurry contains 0.05 to 3% by weight of an organic additive based on the calcined product; the organic compound having a hydroxyl group and a carboxyl group is gluconic acid or citric acid.

2. The method for preparing soft magnetic ferrite powder and the laminated chip inductor as claimed in claim, wherein: the slurry contains ammonia.

3. A method of making a laminated chip inductor, comprising: comprising mixing an organic additive with water, the calcination product comprising Ni-CuZn ferrite to form a slurry; drying the slurry to produce a soft magnetic ferrite powder including iron, nickel, copper, and zinc as main components; the magnetic layer is formed from a soft magnetic ferrite powder, wherein the organic additive is an organic compound having a hydroxyl group and a carboxyl group or a neutralized salt thereof or a lactone, or the organic additive is an organic compound having a hydroxymethylcarbonyl group. An organic compound having an enol-type hydroxyl group, which can be dissociated into an acid or a neutralized salt thereof; the slurry contains iron ions and Cu ions derived from the calcined product and has a total content of Fe ions and Cu ions of 0.005 to 2% by weight based on the calcined product.

Technical Field

The invention relates to a preparation method of soft magnetic ferrite powder capable of being sintered at low temperature, in particular to a preparation method of soft magnetic ferrite powder and a preparation method of a laminated chip inductor.

Background

In recent years, the technology of electronic machines and devices in terms of size and weight is being remarkably developed, and various devices are also rapidly adapted to surface mounting accordingly. As an inductance device, a so-called chip inductor formed by integrating a magnetic material and a coil is used in many cases, and it is desired to improve its performance. For the chip inductor, Ni — CuZn ferrite as a magnetic material is generally used as the magnetic material, and Ag or Ag palladium alloy is used as a conductive material of the coil. In the production of the chip inductor, first, starting compounds containing Fe, Ni, Cu and Zn are mixed separately, for example, with a ball mill, and then the mixture is calcined, and the product is calcined to obtain a soft magnetic ferrite powder. And kneading the soft magnetic ferrite powder, a binder and a solvent together to obtain the magnetic material slurry. Further, the conductive material powder is kneaded together with a binder and a solvent to obtain a conductive material slurry. Then, these pastes are repeatedly printed to laminate a magnetic material layer and a conductive material layer, and then the prepared laminate is sintered to form external electrodes, thereby obtaining a chip inductor. When the Ni — CuZn ferrite powder is sintered at 920 ℃ or less, the densification of ferrite does not proceed well, and thus it is difficult to obtain a ferromagnetic sintered body excellent in electrical properties such as magnetic permeability.

Disclosure of Invention

The present invention has been made to overcome the above-mentioned disadvantages of the prior art and provides a method for preparing a soft magnetic ferrite powder and a method for preparing a laminated chip inductor, which achieve high performance without causing any reaction between a conductive material and ferrite and any wire breakage.

The technical scheme of the invention is as follows: comprising mixing an organic additive with water, calcining the product comprising Ni-CuZn ferrite to form a slurry, drying the slurry, and preparing a soft magnetic ferrite powder comprising iron, nickel, copper and zinc as a main component. The organic additive is an organic compound having a hydroxyl group and a carboxyl group or a neutralized salt thereof or a lactone, or the organic additive is an organic compound having a hydroxymethylcarbonyl group, an organic compound having an enol-type hydroxy DIS. The slurry contains Fe ions and Cu ions derived from the calcined product and has a total content of Fe ions and Cu ions of 0.005 to 2% by weight based on the calcined product; the slurry contains 0.05 to 3% by weight of an organic additive based on the calcined product; the organic compound having a hydroxyl group and a carboxyl group is gluconic acid or citric acid.

The slurry contains ammonia.

A method of manufacturing a laminated chip inductor includes mixing an organic additive with water, and calcining a product including Ni-CuZn ferrite to form a slurry; drying the slurry to produce a soft magnetic ferrite powder including iron, nickel, copper, and zinc as main components; the magnetic layer is formed from a soft magnetic ferrite powder, wherein the organic additive is an organic compound having a hydroxyl group and a carboxyl group or a neutralized salt thereof or a lactone, or the organic additive is an organic compound having a hydroxymethylcarbonyl group. An organic compound having an enol-type hydroxyl group, which can be dissociated into an acid or a neutralized salt thereof; the slurry contains iron ions and Cu ions derived from the calcined product and has a total content of Fe ions and Cu ions of 0.005 to 2% by weight based on the calcined product.

The invention has the beneficial effects that: capable of preparing Ni-CuZn ferrite powder having excellent sinterability at low temperatures, and a method of preparing a laminated chip inductor. In which the ferrite powder is used, so that it can be fired at a low temperature to produce a multilayer chip inductor.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

In fig. 1, in the present invention, ammonia may be added to the slurry in addition to the organic additive. Organic additives used in the present invention, such as tartaric acid, 1-ascorbic acid and citric acid, are called dispersants, and are used to improve the slurry casting molding method. In the present invention, sintering can be performed without depending on the ferrite component to form a dense sintered body at a low temperature. Therefore, the amount ratio of the components of the Ni-CuZn ferrite to which the present invention is applied is not particularly limited. The above amount ratio may be appropriately determined within a general composition range depending on the desired properties. Fe2O3, NiO, CuO and ZnO which take oxides as main components, the general weight ratio of the components is as follows: 35-50 mol% of Fe2O3, 4-50 mol% of NiO, CuO: 4-16 mol% and ZnO: 5-40 mol%. The present invention can be applied not only to a high permeability material having a large content of Fe2O3 but also to a low permeability material having a small content of Fe2O 3. The reason for limiting the oxide content as a main component is as follows. When the amount of Fe2O3 is too small, the formation of a nonmagnetic phase increases, resulting in an increase in loss. When the amount of Fe2O3 is too large, the sinterability is extremely poor. When the amount of NiO is too small, loss increases, and when the amount of NiO is too large, ferrite is expensive. When the amount of CuO is too small, sinterability is poor, and when the amount of CuO is too large, the amount of NiO is relatively small, and thus loss increases. When the amount of ZnO is too small, the permeability is low, and when the amount of ZnO is too large, the curie temperature is too low. First, a calcined product of the starting powder is prepared. As the starting powder, various raw materials generally used for producing Ni — CuZn ferrite, such as oxides or various compounds, which form oxides upon combustion, can be used. Preferably, the calcination is carried out in an oxidizing atmosphere, and in general, the calcination temperature (temperature to be maintained) is generally 700 to 900 ℃ and the calcination time (time period for maintaining the temperature) is generally 0.5 to 10 hours in air. The prepared calcined product was mixed with water to obtain a slurry for pulverization. The pulverized slurry is wet-pulverized until the calcined product has a predetermined particle size or specific surface area, and then the slurry is dried to obtain a soft magnetic ferrite powder.