WO2010087514A1 - MnZn系フェライトコアおよびその製造方法 - Google Patents
MnZn系フェライトコアおよびその製造方法 Download PDFInfo
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- WO2010087514A1 WO2010087514A1 PCT/JP2010/051649 JP2010051649W WO2010087514A1 WO 2010087514 A1 WO2010087514 A1 WO 2010087514A1 JP 2010051649 W JP2010051649 W JP 2010051649W WO 2010087514 A1 WO2010087514 A1 WO 2010087514A1
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Definitions
- the present invention relates to a MnZn-based ferrite core suitable for use in, for example, a magnetic core for a pulse transformer of an Ethernet (registered trademark) device and a method for manufacturing the same.
- Ethernet devices use pulse transformers to maintain impedance matching and electrical insulation at the input / output terminals.
- a soft magnetic material is generally used as a magnetic core.
- this pulse transformer has a high incremental transmission under a DC magnetic field applied in a temperature range of ⁇ 40 to 85 ° C., for example, as defined in the American standard ANSI X3.263-1995 [R2000]. It is required to have a magnetic permeability ⁇ .
- the incremental permeability ⁇ is a value indicating the ease of magnetization of the magnetic core (core) when a magnetic field is applied.
- Ethernet devices With recent advances in communication technology, there is a trend in Ethernet devices not only to increase the transmission speed but also to directly supply the drive power of the device in accordance with the transmission signal.
- the pulse transformer is used under conditions that may cause a larger current than before to be superimposed.
- the peripheral components in the device since the peripheral components in the device generate heat due to the large current, the usage environment of the magnetic core (core) of the pulse transformer may shift to the high temperature side. Therefore, MnZn ferrite used for this application is required to ensure high inductance under high temperature and high magnetic field superposition, that is, high incremental permeability ⁇ .
- Patent Document 1 discloses a technique for improving magnetic characteristics at high temperatures by incorporating cobalt oxide into MnZn ferrite.
- MnZn ferrite for magnetic cores of pulse transformers has been conventionally designed with a high initial permeability ⁇ i in mind, the saturation magnetic flux density is low. It was difficult to obtain a sufficient incremental permeability ⁇ .
- Patent Document 2 proposes that reduction of phosphorus and boron is effective in improving the incremental magnetic permeability ⁇ .
- the MnZn ferrite disclosed in Patent Document 2 has a composition selected for the purpose of reducing the iron loss at 100 ° C. and increasing the effective magnetic permeability, the initial magnetic permeability at a temperature of room temperature or lower is not described in the examples. Since ⁇ i is too low, an incremental permeability ⁇ that is sufficiently satisfactory in a low temperature environment is unlikely.
- Patent Document 3 proposes a technique for improving the iron loss and the amplitude relative permeability at 100 ° C. or higher by defining the chlorine content.
- the chlorine-only content regulation provides an incremental permeability at 23 ° C. It was impossible to set the magnetic permeability ⁇ to 200 or more.
- Patent Document 4 proposes a technique for improving power loss by defining the sulfur content.
- the incremental permeability ⁇ at 23 ° C. is set to 200 or more. It was impossible.
- Patent Document 5 proposes a technique for suppressing abnormal grain growth of ferrite and thereby preventing adverse effects on various properties of ferrite by defining the contents of phosphorus, boron, sulfur and chlorine. With this technique, a MnZn-based ferrite having a high specific resistance and a small squareness ratio can be obtained, but the incremental permeability ⁇ under a high magnetic field is not sufficient.
- Patent Document 6 proposes a technique for suppressing the abnormal grain growth of ferrite and thereby obtaining a high effective magnetic permeability when a DC magnetic field is applied by making the content of phosphorus extremely small in CoO-added ferrite. .
- this technique can obtain a high incremental permeability ⁇ under a low magnetic field of 33 A / m due to the large amount of ZnO.
- the incremental permeability ⁇ under a high magnetic field of 80 A / m is not sufficient. I could't.
- MnZn-based ferrite consisting of basic components, subcomponents and inevitable impurities, Iron oxide (Fe 2 O 3 conversion): 51.0-54.5 mol%, Zinc oxide (ZnO equivalent): 8.0 to 12.0 mol% and manganese oxide (MnO equivalent): In the basic component consisting of the balance, Silicon oxide (SiO 2 equivalent): 50 to 400 mass ppm and calcium oxide (CaO equivalent): 50 to 4000 mass ppm Further, among the inevitable impurities, phosphorus, boron, sulfur and chlorine are respectively phosphorous: less than 3 mass ppm, Boron: less than 3 mass ppm, A MnZn ferrite core consisting of sulfur: less than 5 mass ppm and chlorine: less than 10 mass ppm. "
- the present invention relates to the improvement of the MnZn-based ferrite core described above, and is intended to further improve the incremental magnetic permeability ⁇ .
- the gist configuration of the present invention is as follows. 1.
- phosphorus, boron, sulfur and chlorine are respectively phosphorous: less than 3 mass ppm, Boron: less than 3 mass ppm, Sulfur: less than 5 mass ppm and chlorine: less than 10 mass ppm, and the ratio of the measured specific surface area to the ideal specific surface area of the MnZn ferrite core satisfies the following formula (1).
- the measured specific surface area is assumed to be the specific surface area (m 2 / g) obtained by the BET method (multipoint method) of JIS Z 8830 (2001), and the ideal specific surface area is assumed to be an ideal state where there is no void in the core.
- the specific surface area (m 2 / g) calculated from the dimensions and mass of the core.
- Cobalt oxide (CoO equivalent): 50 to 3000 mass ppm 2.
- MnZn-based ferrite core as described in 1 above, wherein
- ZrO 2 conversion Zirconium oxide
- Tantalum oxide Tantalum oxide
- Hafnium oxide HfO 2 conversion
- the MnZn-based ferrite core according to 1 or 2 above, wherein one or more selected from the above are added.
- a method for producing a MnZn-based ferrite core comprising: granulating into a granulated powder having a crushing strength of 1.10 MPa or less, and then compressing and molding the granulated powder.
- the excellent permeability ⁇ at the time of application of a direct current magnetic field of 80 A / m is always 400 or more in a wide temperature range of 0 to 85 ° C. and the excellent permeability ⁇ at 65 ° C. is 700 or more.
- An MnZn-based ferrite core having the above can be obtained.
- FIG. 1 is a diagram showing an observation cross section of voids in a MnZn-based ferrite core.
- FIG. 2A is a view showing a state in which no gap remains in the core of the present invention.
- FIG.2 (b) is the figure which showed the state in which the space
- FIG. 3 is a diagram showing a calculation procedure of the ideal specific surface area.
- the MnZn-based ferrite core used in this application is mainly used in the small shape of a closed magnetic circuit typified by a toroidal core having an outer diameter of about 2 to 6 mm.
- a toroidal core having an outer diameter of about 2 to 6 mm.
- SEM scanning electron microscope
- the voids due to insufficient crushing of the granulated powder as shown in FIG. May remain.
- the core includes such a gap, the occupied volume of the magnetic material is reduced, so that the magnetic flux is concentrated on the magnetic material portion, and the magnetic flux density is locally increased. For this reason, the same phenomenon that the superimposed magnetic field is increased appears in the magnetic material portion, and the incremental magnetic permeability is decreased.
- the inventors have made extensive studies to solve the above problems, and as a result, have obtained the following knowledge. That is, the voids contained in the core appear as a numerical change that increases the specific surface area of the surface, and it is assumed that the core surface is in a perfectly flat ideal state, and the ideal is calculated from the core dimensions and shape. When the value of the specific surface area was calculated, it was found that if the ratio of the measured specific surface area / ideal specific surface area was suppressed below a certain value, the core gap was small and a desirable incremental magnetic permeability could be obtained.
- the crushing strength of the granulated powder in the manufacturing process of MnZn ferrite is a standard for measuring the crushing strength of granules. It was also found that it was necessary to set the pressure to 1.10 MPa or less when measured by the method defined in JIS Z 8841. The present invention is based on the above findings.
- Iron oxide (Fe 2 O 3 conversion): 51.0-54.5 mol%
- the content of iron oxide is set in the range of 51.0 to 54.5 mol% in terms of Fe 2 O 3 .
- it is 52.0 to 54.0 mol% in terms of Fe 2 O 3 .
- Manganese oxide (MnO conversion) balance
- the present invention is MnZn-based ferrite, and the balance in the basic component composition needs to be manganese oxide.
- the reason is that by including manganese oxide, a high incremental permeability ⁇ of 400 or more cannot be realized under application of a direct current magnetic field of 80 A / m.
- the preferred range of manganese oxide is 34.5 to 40.0 mol% in terms of MnO.
- the basic components, iron oxide, zinc oxide, and manganese oxide are adjusted so that the total amount of values converted to Fe 2 O 3 , ZnO, and MnO is 100 mol%, respectively.
- Calcium oxide (CaO equivalent): 50-4000 mass ppm Calcium oxide segregates at the grain boundaries of MnZn-based ferrite, and moderately reduces the value of initial permeability ⁇ i through the effect of suppressing the growth of crystal grains, and the incremental permeability ⁇ under application of a DC magnetic field Contributes effectively to improvement.
- the content of calcium oxide is less than 50 mass ppm, a sufficient grain growth inhibitory effect cannot be obtained.
- the content of calcium oxide exceeds 4000 mass ppm, abnormal grains appear, and a DC magnetic field is applied.
- the value of the incremental permeability ⁇ at is significantly reduced. Therefore, the content of calcium oxide is set in the range of 50 to 4000 mass ppm in terms of CaO.
- the range is preferably 250 to 2500 mass ppm in terms of CaO.
- the initial permeability ⁇ i at 23 ° C. is preferably about 2500 to 4500.
- Phosphorus less than 3 mass ppm
- boron less than 3 mass ppm
- Phosphorus and boron are inevitable impurities mixed from the raw iron oxide.
- the content of either phosphorus or boron is 3 mass ppm or more, abnormal grain growth is induced, and the incremental magnetic permeability ⁇ is significantly reduced when a large magnetic field is superimposed at 80 A / m. Accordingly, the phosphorus and boron contents were both limited to less than 3 mass ppm.
- a method for restricting both phosphorus and boron to less than 3 mass ppm for example, use of high-purity iron oxide, zinc oxide and manganese oxide having as little phosphorus and boron content as the raw material powder is mentioned.
- a medium having a low content of phosphorus or boron as a medium such as a ball mill or an attritor used for mixing and pulverization in order to avoid the possibility of mixing due to wear of the medium.
- All the values specified here are JIS G 1214 (1998) “Molybdophosphate extraction-separated molybdophosphate blue spectrophotometric method” for the P component, and JIS G 1227 (1999) for the B component. ) Value quantified using the method defined in "curcumin spectrophotometry”.
- Sulfur is an unavoidable impurity mixed from raw iron oxide obtained through iron sulfide.
- the sulfur content is 5 mass ppm or more, abnormal grain growth is induced, and the incremental permeability ⁇ is significantly reduced when a large magnetic field is superimposed at 80 A / m. Therefore, the sulfur content was limited to less than 5 mass ppm. Furthermore, it is more preferable to limit the sulfur content to less than 4 mass ppm.
- sulfur and oxygen are increased by increasing the time of the calcination step performed in an air atmosphere of 800 ° C. or higher.
- the S value specified here is a value quantified using the method specified in JIS G 1215 (1994) “Hydrogen sulfide vaporization separation methylene blue absorptiometry” which is an analysis method of the S component.
- Chlorine is an unavoidable impurity mixed from raw iron oxide obtained through iron chloride.
- the chlorine content is 10 mass ppm or more, abnormal grain growth is induced, and the incremental permeability ⁇ under a direct magnetic field application of 80 A / m is significantly reduced. Therefore, the chlorine content was limited to less than 10 mass ppm. Furthermore, it is more preferable to limit the chlorine content to less than 8 mass ppm.
- a method for limiting chlorine to less than 10 mass ppm for example, when manufacturing MnZn-based ferrite, the raw iron oxide is sufficiently washed with pure water to dissolve easily ionized chlorine in pure water. And a method of reducing the chlorine content.
- the Cl value defined here is a value quantified using “nitric acid decomposition-iron chloride turbidimetric method” which is an analysis method of Cl component.
- unavoidable impurities other than the above-described phosphorus, boron, sulfur and chlorine are all preferably suppressed to 50 mass ppm or less, but are not particularly limited.
- the basic components, subcomponents, and suppression components of the MnZn ferrite core of the present invention have been described above. However, in the present invention, it is not sufficient to limit the component composition of the core to the above range. It is necessary to satisfy. That is, for the surface area of the core, the following formula (1) Measured specific surface area / ideal specific surface area ⁇ 1500 --- (1) It is important to satisfy this relationship.
- the measured specific surface area is a value determined by the BET method (multipoint method) of JIS Z 8830 (2001), and the unit is m 2 / g.
- the ideal specific surface area is a value obtained by dividing the value of the surface area calculated by assuming that the core is free of voids based on the size and mass of the ferrite core by the core mass, and the unit is also m 2 / g. It is.
- the ratio of the measured specific surface area / ideal specific surface area increases.
- the incremental magnetic permeability does not decrease, that is, a dense core with little void remaining on the core surface is obtained. It was revealed that it was obtained.
- a more preferable (measured specific surface area / ideal specific surface area) ratio is 1150 or less.
- the manufacturing process of MnZn ferrite is a well-known technique, and the spray drying method is mainly employed as the granulation method. 52 pages.
- the hardness of the granulated powder can be quantified by measuring the granulated powder crushing strength defined in JIS Z 8841 (1993). If this crushing strength is 1.10 MPa or less, the measured specific surface area is obtained. It has been found that the ratio of the ideal specific surface area can be suppressed to less than 1500. A more preferable crushing strength is 1.00 MPa or less.
- the specific resistance of MnZn-based ferrite is as low as less than 10 2 ⁇ m, it is often used after an insulating coating treatment is applied to the surface.
- the measured value of the core is because when the coating treatment is performed, the surface is smoothed, so that it is impossible to accurately measure the specific surface area of the MnZn-based ferrite.
- the MnZn-based ferrite of the present invention can appropriately contain the following components as further subcomponents.
- Cobalt oxide (CoO equivalent): 50 to 3000 mass ppm
- CoO equivalent 50 to 3000 mass ppm
- the content of cobalt oxide is set in the range of 50 to 3000 mass ppm in terms of CoO.
- Zirconium oxide (converted to ZrO 2 ): 0.005 to 0.075 mass%, tantalum oxide (converted to Ta 2 O 5 ): 0.005 to 0.075 mass%, hafnium oxide (converted to HfO 2 ): 0.005 to 0. 075 mass% and niobium oxide (in terms of Nb 2 O 5 ): one or more selected from 0.005 to 0.075 mass%
- These components are compounds having a high melting point, and MnZn ferrite When it is contained, it has the function of reducing the crystal grains, thereby suppressing the generation of coarse crystal grains and contributing to the improvement of the incremental permeability ⁇ under application of a DC magnetic field. This effect cannot be sufficiently obtained when the content of each component is too small. On the other hand, when the content is too large, abnormal grain growth occurs, resulting in a decrease in incremental permeability ⁇ under application of a DC magnetic field. Therefore, each of these components is included in the above range.
- mu) ⁇ under a 80 A / m magnetic field application can be raised significantly by adding simultaneously with cobalt oxide.
- the reason for this has not yet been clearly clarified, but some compounds are produced that increase the incremental permeability ⁇ when cobalt oxide and zirconium oxide, tantalum oxide, hafnium oxide or niobium oxide are added simultaneously. it is conceivable that.
- the suitable manufacturing method of the MnZn type ferrite of this invention is demonstrated.
- powders of iron oxide, zinc oxide, and manganese oxide, which are basic components are weighed so as to have a predetermined ratio, and after sufficient mixing, calcining is performed.
- the obtained calcined powder is pulverized.
- they are added at a predetermined ratio and pulverized simultaneously with the calcined powder. In this operation, it is necessary to sufficiently homogenize the powder so that the concentration of the added component is not biased, and at the same time to refine the calcined powder to the target average particle size.
- an organic binder such as polyvinyl alcohol is added to the obtained powder, and after forming into a soft granulated powder having a crushing strength of less than 1.10 MPa by granulation by a spray drying method or the like, it is compression molded into a desired shape, Thereafter, firing is performed under suitable firing conditions.
- the pressing force in compression molding is preferably about 115 to 120 MPa, and the firing conditions are preferably 1200 to 1400 ° C. and about 18 to 30 hours.
- the temperature during granulation is lowered, specifically, about 50 to 100 ° C. lower than the conventional 250 to 300 ° C. It is advantageous that the temperature is about 150 to 200 ° C.
- the crushing strength of the granulated powder is about 1.2 to 1.4 MPa. With such a crushing strength, the actual measured specific surface area / ideal ratio targeted by the present invention is as follows. Surface area ⁇ 1500-(1) As described above, cannot be obtained.
- the MnZn-based ferrite thus obtained has an incremental permeability ⁇ of 400 or more in the temperature range of 0 to 85 ° C. under a large DC magnetic field application of 80 A / m, which is impossible with the conventional MnZn-based ferrite, and 65 A high value such that the incremental permeability ⁇ at 700 ° C. can be realized.
- the compact was placed in a firing furnace and fired at a maximum temperature of 1350 ° C. to obtain a sintered body core having an outer diameter of 6.0 mm, an inner diameter of 3.0 mm, and a height of 4.0 mm. It was.
- Each sample thus obtained was wound with 10 turns, and an LCR meter (4284A: 4284A: with a direct current magnetic field of 80 A / m applied to the core using a direct current application device (42841A: manufactured by Agilent Technologies).
- Agilent Technologies, Inc. was used to measure the incremental magnetic permeability ⁇ at 0 ° C., 23 ° C., 65 ° C. and 85 ° C. at a measurement voltage of 100 mV and a measurement frequency of 100 kHz.
- the initial permeability ⁇ i was measured at 23 ° C. using an LCR meter (4284A).
- Sample Nos. 1-3, 1-4, 1-7 and 1-10 which are invention examples, all applied a DC magnetic field of 80 A / m in a wide temperature range of 0 to 85 ° C.
- excellent characteristics are obtained in which the incremental permeability ⁇ is always 400 or more and the incremental permeability ⁇ at 65 ° C. is 700 or more.
- Comparative Example Fe 2 O 3 Comparative Example is more than 54.5mol% (Sample No. 1-1) and Fe 2 O 3 is less than 51.0mol% (Sample No. 1-2), 80A / Under application of a direct current magnetic field of m, the value of incremental permeability ⁇ at 0 ° C. and 85 ° C. was less than 400, and the value of incremental permeability ⁇ at 65 ° C. was less than 700.
- the value of the incremental permeability ⁇ at 85 ° C. is less than 400 under application of a direct current magnetic field of 80 A / m, and 65 The value of the incremental permeability ⁇ at 0 ° C. also decreased to less than 700.
- the incremental permeability ⁇ decreases in all temperature ranges under application of a DC magnetic field of 80 A / m, and the incremental permeability at 0 ° C. and 85 ° C.
- the value of magnetic permeability ⁇ was less than 400, and the value of incremental permeability ⁇ at 65 ° C. was less than 700.
- the initial permeability ⁇ i is excessively increased.
- the value of the incremental permeability ⁇ in the entire temperature range is lower than that of the inventive example, and the value of the incremental permeability ⁇ at 0 ° C. and 85 ° C. is less than 400 under application of a DC magnetic field of 80 A / m. And the value of the incremental permeability ⁇ at 65 ° C. was less than 700.
- iron oxide raw materials having different contents of P, B, S and Cl
- calculation was performed so that the contents of P, B, S and Cl were in the ratios shown in Tables 2-1 and 2-2.
- the composition of iron oxide, zinc oxide and manganese oxide as basic components is Fe 2 O 3 : 52.0 mol%, ZnO: 10.0 mol% and MnO: in terms of Fe 2 O 3 , ZnO and MnO, respectively:
- the raw materials were weighed so as to be the remainder, mixed for 16 hours using a ball mill, and then calcined in air at 925 ° C. for 3 hours.
- silicon oxide and calcium oxide are added as subcomponents in terms of SiO 2 and CaO, respectively, SiO 2 : 100 mass ppm, CaO: 500 mass ppm.
- the mixture was pulverized with a ball mill for 12 hours, and the resulting mixed powder was granulated by adding polyvinyl alcohol, and a toroidal core was formed by applying a pressure of 118 MPa.
- the crushing strength of the obtained granulated powder was changed by changing the granulation temperature in various ways. Thereafter, this compact was put into a firing furnace and fired at a maximum temperature of 1350 ° C. to obtain a sintered body core having an outer diameter of 6.0 mm, an inner diameter of 3.0 mm, and a height of 4.0 mm.
- Each sample thus obtained was wound with 10 turns, and using the same DC application device and LCR meter as in the example, with a DC magnetic field of 80 A / m applied, measurement voltage: 100 mV, measurement frequency : Incremental permeability ⁇ at 0 ° C., 23 ° C., 65 ° C. and 85 ° C. at 100 kHz was measured.
- the crushing strength of the granulated powder is measured according to the provisions of JIS Z 8841, the measured specific surface area is measured according to the BET method (multi-point method) of JIS Z 8830 (2001), and JIS C 2560 From the value of the ideal specific surface area calculated based on the dimensions and weight measured based on the above: ideal specific surface area: 4.44 ⁇ 10 ⁇ 4 m 2 / g), the ratio of (actually measured specific surface area / ideal specific surface area) was determined. Note that the method of measuring the initial magnetic permeability ⁇ i and the average crystal grain size is the same as in Example 1. The obtained results are shown in Tables 2-1 and 2-2.
- the numerical value of the measured specific surface area / ideal specific surface area is 1500 or more, that is, a large amount due to defective granulated powder crush Therefore, the characteristics that the incremental permeability ⁇ in the temperature range of 0 to 85 ° C. is 400 or more and the incremental permeability ⁇ at 65 ° C. is 700 or more cannot be satisfied.
- the measured specific surface area measured according to the BET method (multi-point method) of JIS Z 8830 (2001) is 0.453 to 0.493 m 2 / g, and therefore the ratio of (measured specific surface area / ideal specific surface area) is 1020. ⁇ 1110, both below 1500. Table 4 shows the obtained results.
- Calcined powder having the same composition as Sample No. 1-4 (however, P: 2 mass ppm, B: 2 mass ppm, S: 3 mass ppm and Cl: adjusted to 6 mass ppm), zirconium oxide, tantalum oxide, hafnium oxide as subcomponents And niobium oxide were added so that the final composition had the ratio shown in Table 5 in terms of ZrO 2 , Ta 2 O 5 , HfO 2 , and Nb 2 O 5 , and pulverized for 12 hours with a ball mill.
- the measured specific surface area measured according to the BET method (multi-point method) of JIS Z 8830 (2001) is 0.453 to 0.493 m 2 / g, and therefore the ratio of (measured specific surface area / ideal specific surface area) is 1020. ⁇ 1110, both below 1500.
- the results obtained are shown in Table 5.
- the measured specific surface area measured according to the BET method (multi-point method) of JIS Z 8830 (2001) is 0.453 to 0.493 m 2 / g, and therefore the ratio of (measured specific surface area / ideal specific surface area) is 1020. ⁇ 1110, both below 1500.
- the obtained results are shown in Table 6.
- the excellent permeability ⁇ when applying a direct current magnetic field of 80 A / m is always 400 or more in a wide temperature range of 0 to 85 ° C., and the excellent permeability ⁇ at 65 ° C. is 700 or more.
- MnZn-based ferrite cores can be obtained. For example, it is effective for use in a magnetic core of a pulse transformer of an Ethernet device.
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Abstract
Description
そのため、この用途に用いられるMnZnフェライトには、より高温、高磁場重畳の下で高いインダクタンス、すなわち高い増分透磁率μΔの確保が求められている。
例えば、特許文献1には、MnZnフェライトにコバルト酸化物を含有させることによって、高温下における磁気特性の改善を図る技術が開示されている。しかしながら、パルストランスの磁心用MnZnフェライトは、従来、高い初透磁率μiを得ることを念頭に入れて組成設計されてきたことから、飽和磁束密度が低く、そのため、高温・高磁場の下で十分な増分透磁率μΔを得ることは難しかった。
特許文献3には、塩素の含有量を規定することで、100℃以上における鉄損と振幅比透磁率を改善する技術が提案されているが、塩素のみの含有規定では、23℃における増分透磁率μΔを200以上とすることは不可能であった。
「基本成分と副成分と不可避的不純物とからなるMnZn系フェライトであって、
酸化鉄(Fe2O3換算):51.0~54.5mol%、
酸化亜鉛(ZnO換算):8.0~12.0mol%および
酸化マンガン(MnO換算):残部
からなる基本成分中に、副成分として、
酸化珪素(SiO2換算):50~400mass ppmおよび
酸化カルシウム(CaO換算):50~4000mass ppm
を添加し、さらに不可避的不純物のうち、リン、ホウ素、硫黄および塩素をそれぞれ
リン:3mass ppm未満、
ホウ素:3mass ppm未満、
硫黄:5mass ppm未満および
塩素:10mass ppm未満
に抑制したことからなるMnZn系フェライトコア。」
本発明は、上記したMnZn系フェライトコアの改良に係るもので、増分透磁率μΔの一層の向上を図ったものである。
1.基本成分と副成分と不可避的不純物とからなるMnZn系フェライトコアであって、
酸化鉄(Fe2O3換算):51.0~54.5mol%、
酸化亜鉛(ZnO換算):8.0~12.0mol%および
酸化マンガン(MnO換算):残部
からなる基本成分中に、副成分として、
酸化珪素(SiO2換算):50~400mass ppmおよび
酸化カルシウム(CaO換算):50~4000mass ppm
を添加し、かつ不可避的不純物のうち、リン、ホウ素、硫黄および塩素をそれぞれ
リン:3mass ppm未満、
ホウ素:3mass ppm未満、
硫黄:5mass ppm未満および
塩素:10mass ppm未満
に抑制し、さらに該MnZn系フェライトコアの理想比表面積に対する実測比表面積の比が次式(1)を満足することを特徴とするMnZn系フェライトコア。
実測比表面積/理想比表面積 < 1500 −−−(1)
ここで、実測比表面積は、JIS Z 8830(2001年)のBET法(多点法)で求めた比表面積(m2/g)、理想比表面積は、コアに空隙がない理想状態と仮定し、コアの寸法と質量から計算した比表面積(m2/g)である。
酸化コバルト(CoO換算):50~3000mass ppm
を添加したことを特徴とする上記1に記載のMnZn系フェライトコア。
酸化ジルコニウム(ZrO2換算):0.005~0.075mass%、
酸化タンタル(Ta2O5換算):0.005~0.075mass%、
酸化ハフニウム(HfO2換算):0.005~0.075mass%および
酸化ニオブ(Nb2O5換算):0.005~0.075mass%
のうちから選んだ1種または2種以上を添加したことを特徴とする上記1または2に記載のMnZn系フェライトコア。
このような空隙をコアが含んでいると、磁性体の占有体積が減少するため、磁束は磁性体部分に集中し、磁束密度が局所的に上昇する。そのため、見かけ上、磁性体部分には重畳磁場が上昇したのと同じ現象が出現し、そのため増分透磁率は低下してしまう。
すなわち、コアに含まれる空隙は、表面の比表面積の増加という数値変化となって出現すること、そして、コア表面が完全に平らな理想状態であると仮定し、コア寸法形状から算出される理想比表面積の値を算出した時、実測比表面積/理想比表面積の比がある一定の値未満に抑制されれば、コア空隙が少なく、望ましい増分透磁率が得られることを突き止めた。
本発明は、上記の知見に立脚するものである。
まず、本発明のMnZn系フェライトコアの基本成分組成を前記の範囲に限定した理由について述べる。
基本成分のうち、酸化鉄が51.0mol%未満の場合および54.5mol%を超える場合ともに、低温度域および高温度域における直流磁場印加の下での増分透磁率μΔが低下する。従って、酸化鉄の含有量は、Fe2O3換算で51.0~54.5mol%の範囲とした。好ましくはFe2O3換算で52.0~54.0mol%である。
酸化亜鉛の含有量が8.0mol%に満たないと、直流磁場印加の下で十分な増分透磁率μΔが得られない。一方、酸化亜鉛の含有量が12.0mol%を超える場合、低温度領域においては、直流磁場印加の下での増分透磁率μΔが低下し、また高温度領域においては、強磁性体が磁性を失うキュリー温度が低下することから、やはり直流磁場印加下での増分透磁率μΔの低下をきたす。従って、酸化亜鉛の含有量は、ZnO換算で8.0~12.0mol%の範囲とした。好ましくはZnO換算で9.0~11.0mol%の範囲である。
本発明はMnZn系フェライトであり、基本成分組成における残部は酸化マンガンとする必要がある。その理由は、酸化マンガンを含有させることにより、80A/mの直流磁場印加の下で400以上という高い増分透磁率μΔを実現できないからである。酸化マンガンの好適範囲はMnO換算で34.5~40.0mol%である。
なお、基本成分である酸化鉄、酸化亜鉛および酸化マンガンは、それぞれFe2O3、ZnOおよびMnOに換算した値の合計量が100mol%となるように調整する。
酸化珪素は、結晶粒内に残留する空孔を減少させるにより、直流磁場印加の下での増分透磁率μΔを高める効果がある。しかしながら、酸化珪素の含有量が50mass ppmに満たないとその添加効果に乏しく、一方酸化珪素の含有量が400mass ppmを超えると、異常粒が出現し、直流磁場印加の下での増分透磁率μΔの値を著しい低下を招く。従って、酸化珪素の含有量はSiO2換算で50~400mass ppmの範囲とした。好ましくはSiO2換算で100~250mass ppmの範囲である。
酸化カルシウムは、MnZn系フェライトの結晶粒界に偏析し、結晶粒の成長を抑制する効果を通じて、初透磁率μiの値を適度に低下させ、直流磁場印加の下での増分透磁率μΔの向上に有効に寄与する。しかしながら、酸化カルシウムの含有量が50mass ppmに満たないと十分な粒成長抑制効果が得られず、一方、酸化カルシウムの含有量が4000mass ppmを超えると、異常粒が出現し、直流磁場印加の下での増分透磁率μΔの値を著しく低下させる。従って、酸化カルシウムの含有量は、CaO換算で50~4000mass ppmの範囲とした。好ましくはCaO換算で250~2500mass ppmの範囲である。
なお、23℃における初透磁率μiの値は、2500~4500程度とするのが好ましい。
リンおよびホウ素は、原料酸化鉄から混入する不可避的不純物である。リンおよびホウ素のいずれかの含有量が3mass ppm以上になると、異常粒成長を誘発し、80A/mという大磁場重畳時における増分透磁率μΔを著しく低下させる。従って、リンおよびホウ素の含有量はいずれも3mass ppm未満に制限した。
なお、リンおよびホウ素をともに3mass ppm未満に制限するための方法としては、例えば、リンおよびホウ素の含有量が極力少ない高純度の酸化鉄、酸化亜鉛および酸化マンガンを原料粉として使用することが挙げられる。また、混合・粉砕時に用いるボールミルやアトライター等の媒体についても、媒体の摩耗による混入のおそれを回避するため、リンやホウ素の含有量が少ないものを使用することが好ましい。
なお、ここに規定した値は全て、P成分の分析手法はJIS G 1214(1998年)「モリブドりん酸塩抽出分離モリブドりん酸青吸光光度法」、またB成分についてはJIS G 1227(1999年)「クルクミン吸光光度法」に規定された手法を用い定量化した値である。
硫黄は、硫化鉄を経て得られる原料酸化鉄から混入する不可避的不純物である。硫黄の含有量が5mass ppm以上の場合には、異常粒成長が誘発され、80A/mという大磁場重畳時における増分透磁率μΔを著しく低下させる。従って、硫黄の含有量は5mass ppm未満に制限した。さらに、硫黄の含有量を4mass ppm未満に制限することは、より好ましい。
なお、硫黄を5mass ppm未満に制限するための方法としては、例えば、MnZn系フェライトを製造する際、800℃以上の大気雰囲気下で行われる仮焼工程の時間を長くすることにより、硫黄と酸素を充分に反応させて硫黄の含有量を低減させる方法が挙げられる。
なお、ここに規定したS値は、S成分の分析手法であるJIS G 1215(1994年)「硫化水素気化分離メチレンブルー吸光光度法」に規定された手法を用い定量化した値である。
塩素は、塩化鉄を経て得られる原料酸化鉄から混入する不可避的不純物である。塩素の含有量が10mass ppm以上の場合には、異常粒成長を誘発し、直流磁場印加:80A/mの下での増分透磁率μΔを著しく低下させる。従って、塩素の含有量は10mass ppm未満に制限した。さらに、塩素の含有量を8mass ppm未満に制限することは、より好ましい。
なお、塩素を10mass ppm未満に制限するための方法としては、例えば、MnZn系フェライトを製造する際、原料酸化鉄を純水で十分に洗浄することにより、イオン化しやすい塩素を純水中に溶かし込み、塩素の含有量を低下させる方法が挙げられる。
なお、ここに規定したCl値は、Cl成分の分析手法である「硝酸分解−塩化鉄比濁法」を用いて定量化した値である。
すなわち、コアの表面積について、次式(1)
実測比表面積/理想比表面積 < 1500 −−−(1)
の関係を満足させることが重要である。
ここに、実測比表面積は、JIS Z 8830(2001年)のBET法(多点法)で求めた値であり、単位はm2/gである。また、理想比表面積は、フェライトコアの寸法及び質量を基に、コアに空隙がなく理想状態と仮定して算出した表面積の値をコア質量で除した値であり、単位は同じくm2/gである。
参考のため、図3に、理想比表面積の算出要領を示す。
すなわち、コア表面が完全に平らな、理想状態と仮定すれば、比表面積は、次の式で算出が可能。
理想比表面積={2×(外径2—内径2)/4×π+(外径+内径)×π×高さ}/コア質量
また、造粒粉の硬度については、JIS Z 8841(1993年)に定められた造粒粉圧壊強度測定により数値化が可能であり、この圧壊強度が1.10MPa以下であれば、実測比表面積/理想比表面積の比を1500未満に抑制可能であることが究明された。より好ましい圧壊強度は1.00MPa以下である。
正の磁気異方性を有する酸化コバルトを適量含有させることで、0℃から85℃にわたる広い温度域にわたって直流磁場印加の下での増分透磁率μΔの向上が実現可能である。しかしながら、酸化コバルトの含有量が50mass ppm未満ではその添加効果に乏しく、一方、酸化コバルトの含有量が3000mass ppmを超えると、全温度域で直流磁場印加の下での増分透磁率μΔが低下する。従って、酸化コバルトの含有量は、CoO換算で50~3000mass ppmの範囲とした。
これらの成分はいずれも、高い融点をもつ化合物であり、MnZn系フェライトに含有させた場合には結晶粒を小さくする働きをもつことから、粗大な結晶粒の生成を抑制し、直流磁場印加の下での増分透磁率μΔの向上に寄与する。この効果は、各成分の含有量があまりに少ないと十分には得られず、一方、あまりに多すぎると、異常粒成長が発生し、直流磁場印加の下での増分透磁率μΔの低下を招く。従って、これらの成分はそれぞれ、上記の範囲で含有させるものとした。
まず、所定の比率になるように、基本成分である酸化鉄、酸化亜鉛および酸化マンガンの粉末を秤量し、これらを充分に混合した後に仮焼を行う。次に、得られた仮焼粉を粉砕する。また、上記した副成分を加える際は、それらを所定の比率で加え、仮焼粉と同時に粉砕を行う。この作業で、加えた成分の濃度に偏りがないように粉末の十分な均質化を行い、同時に仮焼粉を目標とする平均粒径まで微細化する必要がある。ついで、得られた粉末に、ポリビニルアルコール等の有機物バインダーを加え、スプレードライ法等による造粒により圧壊強度が1.10MPa未満の軟い造粒粉とした後に,所望の形状に圧縮成形し、その後適切な焼成条件の下で焼成を行う。圧縮成形における加圧力は115~120MPa程度、また焼成条件は1200~1400℃、18~30時間程度とするのが好ましい。
なお、従来の250~300℃で造粒した場合、造粒粉の圧壊強度は1.2~1.4MPa程度となり、かような圧壊強度では、本発明で目標とする
実測比表面積/理想比表面積 < 1500 −−−(1)
が得られないことは、前述したとおりである。
また、JIS Z 8841に基づき測定した造粒粉の圧壊強度は0.90±0.05MPaであったためにフェライトコア表面の空隙残存が少なく、そのため実測比表面積は0.453~0.493m2/g、また理想比表面積は4.44×10−4m2/gであり、(実測比表面積/理想比表面積)比は1020~1110と、いずれも1500を下回っていた。
さらに、各試料の結晶粒径については、コアを切断し、破断面を研磨したものを光学顕微鏡を用いて500倍で異なる3視野を撮影し、画像内に含まれる粒子について測定した粒径から平均結晶粒径を算出した。
得られた結果を表1に併記する。
得られた結果を表2−1、表2−2に併記する。
これに対し、P、B、SおよびClのうち一つでもその含有量が適正範囲を超えた比較例(試料番号2−2~2−39)はいずれも、80A/mの直流磁場印加の下で、0~85℃における増分透磁率μΔの値が400未満であり、また65℃における増分透磁率μΔの値も700未満であた。
また、JIS Z 8841の規定に準拠して造粒粉の圧壊強度を測定すると共に、JIS Z 8830(2001年)のBET法(多点法)に従って実測比表面積を測定し、(実測比表面積/理想比表面積)比を求めた。なお、初透磁率μiおよび平均結晶粒径の測定方法は実施例1の場合と同じである。
得られた結果を表3に示す。
しかしながら、造粒粉圧壊強度が1.10MPa以上である比較例(試料番号3−5~3−7)では、実測比表面積/理想比表面積の数値が1500以上、すなわち造粒粉潰れ不良による多くの空隙を含んでいるため、0~85℃の温度域における増分透磁率μΔが400以上で、かつ65℃における増分透磁率μΔが700以上という特性を満足できていない。
得られた結果を表4に示す。
しかしながら、CoOを上限値を超えて多量に含有させた比較例(試料番号4−5~4−7)はいずれも、80A/mの直流磁場印加の下での増分透磁率μΔが全温度域において大幅に劣化した。
得られた結果を表5に示す。
しかしながら、これら4成分のうちの1成分でも上限値を超えて多量に含有させた比較例(試料番号5−16~5−18)では、異常粒成長が発生し、80A/mの直流磁場印加の下での増分透磁率μΔは全温度域において大幅に劣化した。
得られた結果を表6に示す。
しかしながら、これら4成分のうちの1成分でも上限値を超えて多量に含有させた比較例(試料番号6−16~6−18)では、異常粒成長が発生し、80A/mの直流磁場印加の下での増分透磁率μΔは全温度域において大幅に劣化した。
Claims (4)
- 基本成分と副成分と不可避的不純物とからなるMnZn系フェライトコアであって、
酸化鉄(Fe2O3換算):51.0~54.5mol%、
酸化亜鉛(ZnO換算):8.0~12.0mol%および
酸化マンガン(MnO換算):残部
からなる基本成分中に、副成分として、
酸化珪素(SiO2換算):50~400mass ppmおよび
酸化カルシウム(CaO換算):50~4000mass ppm
を添加し、かつ不可避的不純物のうち、リン、ホウ素、硫黄および塩素をそれぞれ
リン:3mass ppm未満、
ホウ素:3mass ppm未満、
硫黄:5mass ppm未満および
塩素:10mass ppm未満
に抑制し、さらに該MnZn系フェライトコアの理想比表面積に対する実測比表面積の比が次式(1)を満足することを特徴とするMnZn系フェライトコア。
実測比表面積/理想比表面積 < 1500 −−−(1)
ここで、実測比表面積は、JIS Z 8830(2001年)のBET法(多点法)で求めた比表面積(m2/g)、理想比表面積は、コアに空隙がない理想状態と仮定し、コアの寸法と質量から計算した比表面積(m2/g)である。 - 上記副成分として、さらに、
酸化コバルト(CoO換算):50~3000mass ppm
を添加したことを特徴とする請求項1に記載のMnZn系フェライトコア。 - 上記副成分として、さらに、
酸化ジルコニウム(ZrO2換算):0.005~0.075mass%、
酸化タンタル(Ta2O5換算):0.005~0.075mass%、
酸化ハフニウム(HfO2換算):0.005~0.075mass%および
酸化ニオブ(Nb2O5換算):0.005~0.075mass%
のうちから選んだ1種または2種以上を添加したことを特徴とする請求項1または2に記載のMnZn系フェライトコア。 - 請求項1乃至3のいずれかに記載のMnZn系フェライトコアを製造する方法であって、請求項1に記載の基本成分を仮焼した仮焼粉に、請求項1乃至3のいずれかに記載の副成分を添加したのち、圧壊強度が1.10MPa以下の造粒粉に造粒し、ついで該造粒粉を圧縮成形後、焼成することを特徴とするMnZn系フェライトコアの製造方法。
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WO2022014217A1 (ja) * | 2020-07-14 | 2022-01-20 | Jfeケミカル株式会社 | MnZn系フェライト |
JPWO2022014218A1 (ja) * | 2020-07-14 | 2022-01-20 | ||
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JP7185791B2 (ja) | 2020-07-14 | 2022-12-07 | Jfeケミカル株式会社 | MnZn系フェライト |
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CN102300830B (zh) | 2014-05-28 |
JP2010173899A (ja) | 2010-08-12 |
JP5546135B2 (ja) | 2014-07-09 |
TW201040112A (en) | 2010-11-16 |
TWI452013B (zh) | 2014-09-11 |
EP2383242B1 (en) | 2017-10-25 |
CN102300830A (zh) | 2011-12-28 |
US8512589B2 (en) | 2013-08-20 |
EP2383242A1 (en) | 2011-11-02 |
EP2383242A4 (en) | 2016-06-22 |
US20110279217A1 (en) | 2011-11-17 |
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