Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

MnCoZn ferrite and production method for same

A manufacturing method, ferrite technology, applied in chemical instruments and methods, inorganic chemistry, inorganic material magnetism, etc., can solve the problems of insufficient grain boundary formation, lower resistivity, etc., and achieve the suppression of abnormal particle growth, squareness ratio, etc. Low, excellent damage resistance effect

Active Publication Date: 2019-11-05
JFE CHEMICAL CORP
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the resistivity decreases due to insufficient grain boundary formation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • MnCoZn ferrite and production method for same
  • MnCoZn ferrite and production method for same
  • MnCoZn ferrite and production method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] After converting all the iron, zinc, cobalt and manganese contained into Fe 2 o 3 , ZnO, CoO and MnO, weigh Fe according to the ratio shown in Table 1 2 o 3 , the amounts of ZnO, CoO and MnO, each raw material powder was mixed for 16 hours using a ball mill, and then calcined at 925° C. in air for 3 hours. Then, weigh SiO equivalent to 150 and 700 mass ppm equivalents, respectively 2 and CaO, it was added to the calcined powder and pulverized using a ball mill for 12 hours. Next, polyvinyl alcohol was added to the obtained pulverized slurry, spray-dried and granulated at an exhaust air temperature of 250 °C, coarse powder was removed through a sieve with a mesh size of 350 μm, and then a pressure of 118 MPa was applied to form a ring core and rectangular core. In addition, due to the use of high-purity raw materials, and before use, media such as ball mills are thoroughly cleaned to reduce the mixing of components derived from other materials, so the impurities P, ...

Embodiment 2

[0133] After converting all the iron, zinc, cobalt and manganese contained into Fe 2 o 3 , ZnO, CoO and MnO, according to Fe 2 o 3 A composition of 49.0 mol% ZnO, 10.0 mol% ZnO, 2.0 mol% CoO and the balance MnO weighed raw materials, mixed them using a ball mill for 16 hours, and then calcined in air at 925°C for 3 hours. Then, the amount of SiO shown in Table 2 was added to the calcined powder 2and CaO, and pulverized using a ball mill for 12 hours. Next, polyvinyl alcohol was added to the obtained pulverized slurry, spray-dried and granulated at an exhaust air temperature of 250°C, the coarse powder was removed through a sieve with a mesh size of 350 μm, and a pressure of 118 MPa was applied to form an annular core and cylindrical core. In addition, the contents of P, B, S, Cl, Bi, and Zr in both the annular core and the cylindrical core were 5 mass ppm, the particle size distribution d90 of the granulated powder used for molding was 230 μm, and the crushing strength wa...

Embodiment 3

[0143] According to the method shown in Examples 1 and 2, the outer diameter is produced by using the basic ingredients and auxiliary ingredients in the same proportion as in Example 1-2, but using raw materials with different amounts of impurities, or adding ingredients intentionally: 25mm, inner diameter: 15mm, height: sintered body annular core of 5mm, and 5 diameters: 10mm, height: the cylindrical core of 10mm, use the same method and apparatus evaluation characteristic with embodiment 1, and the result that obtains is shown in Table 3. In addition, the particle size distribution d90 of the granulated powder used for molding was 230 μm, and the crushing strength was 1.29 MPa.

[0144] [table 3]

[0145]

[0146] As shown in the table, in Example 3-1 in which the contents of P, B, S, Cl, Bi, and Zr were below the prescribed values, the strength expressed as the abrasion value, and the squareness ratio at 100°C could be obtained , resistivity, and magnetic properties in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Outer diameteraaaaaaaaaa
The inside diameter ofaaaaaaaaaa
Resistivityaaaaaaaaaa
Login to View More

Abstract

Provided is a MnCoZn ferrite that not only has favorable magnetic characteristics such as high resistivity and low squareness ratio but also has excellent mechanical strength. A MnCoZn ferrite that comprises fundamental components, auxiliary components, and unavoidable impurities is disclosed. As the fundamental components, the MnCoZn ferrite includes at least 47.1 mol% but less than 50.0 mol% ofiron in terms of Fe2O3, at least 3.0 mol% but less than 15.5 mol% of zinc in terms of ZnO, and 0.5-4.0 mol% of cobalt in terms of CoO, the remainder being manganese. As the auxiliary components, the MnCoZn ferrite includes, relative to the fundamental components, 50-300 mass ppm of SiO2 and 300-1,300 mass ppm of CaO. The P, B, S, Cl, Bi, and Zr of the unavoidable impurities are suppressed to lessthan 50 mass ppm of P, less than 20 mass ppm of B, less than 30 mass ppm of S, less than 50 mass ppm of Cl, less than 20 mass ppm of Bi, and less than 20 mass ppm of Zr. As a result, the MnCoZn ferrite has a rattler value of less than 0.85%, a squareness ratio of no more than 0.35 at 100 DEG C, a relative resistivity of at least 30 Omega m, and a Curie temperature of at least 170 DEG C.

Description

technical field [0001] The present invention relates to a MnCoZn-like ferrite, which is suitable for applications such as noise filters for vehicles, has a high resistivity, and is effective as a residual magnetic flux density and a saturation temperature at 100° C. The squareness ratio of the ratio of magnetic flux density (residual magnetic flux density / saturation magnetic flux density) is small, and it is difficult to damage. Background technique [0002] A typical example of the soft magnetic oxide magnetic material is MnZn ferrite. Conventional MnZn ferrite contains about 2% by mass or more of Fe having positive magnetic anisotropy 2+ , to offset the Fe with negative magnetic anisotropy 3+ , Mn 2+ , thus achieving high initial permeability and low loss in the kHz region. [0003] Such MnZn ferrite is widely used as a noise filter of a switching power supply or the like, a transformer, or a magnetic core of an antenna because it is cheaper than an amorphous metal or ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/38C01G51/00H01F1/34H01F1/36
CPCC01G51/00H01F1/34H01F1/36
Inventor 吉田裕史中村由纪子
Owner JFE CHEMICAL CORP
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com