CN105836808B - A kind of bonded ferrite magnetic powder and bonded permanent magnet and preparation method thereof - Google Patents
A kind of bonded ferrite magnetic powder and bonded permanent magnet and preparation method thereof Download PDFInfo
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- CN105836808B CN105836808B CN201610167551.6A CN201610167551A CN105836808B CN 105836808 B CN105836808 B CN 105836808B CN 201610167551 A CN201610167551 A CN 201610167551A CN 105836808 B CN105836808 B CN 105836808B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
Abstract
The present invention provides a kind of bonded permanent ferrite magnetic powder and bonded permanent magnet and preparation method thereof, and the bonded ferrite magnetic powder has the principal phase of following molecular formula：(Sr1‑xBax)O·nFe2O3, wherein, n represents molar ratio, meets n=6.11~6.30,0.10≤x≤0.20.Bonded permanent ferrite magnetic powder preparation method includes using technical grade iron oxide red, strontium carbonate and barium carbonate as raw material, according to molecular formula (Sr1~xBax)O·nFe2O3Dispensing is carried out, the raw material is uniformly mixed, mixed process adds strontium chloride；Pre-burning is carried out at 1200~1280 DEG C, obtains Preburning material；To the Preburning material coarse crushing and grinding, fine powder is obtained after dry；Anneal to the fine powder；Obtained magnetic powder and nylon 6 and being uniformly mixed of associated additives, by being granulated and being injection moulded, obtain the bonded permanent magnet that Br is more than 310mT.
Description
Technical field
The present invention relates to field of magnetic material, more particularly to a kind of bonded permanent ferrite magnetic powder and bonded permanent magnet and its
Preparation method.
Background technology
Permanent-magnet ferrite material because with raw material sources extensively and the cheap, advantage such as cost performance is high, therefore
The industry such as motor, automobile, household electrical appliances and sphere of life are used widely, and permanent-magnet ferrite material is still that yield is highest forever so far
Magnetic material.Bonded ferrite is that ferromagnetic oxide powder and binding agent are combined.
The magnetic property index of bonded ferrite product mainly has residual magnetic flux density Br, intrinsic coercivity jHc, maximum magnetic flux
Energy product (BH)maxDeng.With the miniaturization of electronic component, the volume of magnet is less and less, therefore the performance of magnet is necessary
Develop towards high performance.The magnetic property of bonded ferrite is intrinsic by the magnetic powder filling rate in magnet, the magnetic powder degree of orientation and magnetic powder
Performance is determined that the influence factor of residual magnetic flux density is shown below, 4 π Ms*Nc*X of Br ∝, wherein, 4 π Ms represent magnetic powder
Saturation magnetization, Nc represents the degree of orientation of magnetic powder, and X represents the filling rate of magnetic powder.The product of high remanent magnetism is obtained, it is just necessary
Using the magnetic powder of high Ms (saturation magnetization of magnetic powder), improve the filling rate of magnetic powder as far as possible and improve taking for magnetic powder as far as possible
Xiang Du.
In the prior art, a kind of scheme for the preparation process for improving magnetic powder Ms, by adding a certain proportion of La, Zn and Bi
Element, makes the magnetic powder have the principal phase of following molecular formula：(M1~xLax)O·n(Fe1~yZnyBiz)2O3.Wherein, M represents strontium, barium
At least one of element；X, y, z, n represent molar ratio, meet x=2mn (y+z), and x=0.01~0.40,0.01≤z/
Y≤0.3, n=5.50~6.40, m=0.90~1.10.But the technology does not illustrate how to improve the filling of magnetic powder well
Rate, it is as much as possible that magnetic powder is filled into binding agent, to obtain magnet performance as high as possible.The injection that the technology is obtained
Magnet Br performances not can exceed that 295mT (milli tesla).
In the prior art, less than 1 micron of micro mist and 70~80% particle size range of the another program using 20~30%
The bonded ferrite magnetic powder with wider size distribution particle is mixed with 1.0~5.0 microns of coarse powder, so as to obtain preferably
Mobility.But the magnetic powder that the program is obtained, because the fine powder containing larger proportion, the viscosity of magnetic powder is larger, and magnetic powder is filled out
Charge is also difficult to break through 91wt.%, obtains injection magnet Br and not can exceed that 305mT.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of bonded permanent ferrite magnetic powder and bonded permanent magnet and its preparation
Method, to obtain the bonded permanent magnet that Br is more than 310mT.
In order to solve the above technical problem, the present invention provides a kind of bonded ferrite magnetic powder, wherein, the cohesive iron oxygen
Body magnetic powder has the principal phase of following molecular formula：(Sr1~xBax)O·nFe2O3, wherein, n represent molar ratio, meet n=6.11~
6.30,0.10≤x≤0.20.
Further, above-mentioned bonded ferrite magnetic powder also has the characteristics that following：
The pressed density of the bonded ferrite magnetic powder is 3.50~3.70g/cm3。
To solve the above-mentioned problems, present invention also offers a kind of bonded permanent magnet, wherein, the bonded permanent magnet uses above-mentioned
Bonded ferrite magnetic powder as Magnaglo, after being mixed with nylon powder, be prepared by injection moulding.
Further, above-mentioned bonded permanent magnet also has the characteristics that following：
The residual magnetic flux density of the bonded permanent magnet is higher than 310 milli teslas.
To solve the above-mentioned problems, present invention also offers a kind of preparation method of bonded ferrite magnetic powder, including：
Technical grade iron oxide red, strontium carbonate and barium carbonate are used as raw material, according to molecular formula (Sr1~xBax)O·nFe2O3Matched somebody with somebody
Material, wherein, n represents molar ratio, meets n=6.11~6.30,0.10≤x≤0.20；
The raw material is uniformly mixed, mixed process adds strontium chloride；
Pre-burning is carried out at 1200~1280 DEG C, obtains Preburning material；
To the Preburning material coarse crushing and grinding, fine powder is obtained after dry；
Anneal to the fine powder.
To sum up, the present invention provides a kind of bonded permanent ferrite magnetic powder and preparation method thereof and bonded permanent magnet, can protect
On the premise of the jHc of card magnetic powder reaches 220~250kA/m, realize and the pressed density of magnetic powder brought up into more than 3.50g/cm3,
The loading of magnetic powder is brought up to more than 91.3%, so as to obtain the bonded permanent magnet that Br is more than 310mT.
Brief description of the drawings
Fig. 1 is the flow chart of the preparation method of the bonded ferrite magnetic powder of the embodiment of the present invention；
Fig. 2 is influence graph of a relation of the barium element substitution amount (x) to magnetic powder pressed density；
Fig. 3 is influence graph of a relation of the barium element substitution amount (x) to magnetic powder pressed compact jHc.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where there is no conflict, in the embodiment and embodiment in the application
Feature can mutually be combined.
The embodiment of the present invention provides a kind of bonded ferrite magnetic powder, has the principal phase of following molecular formula：
(Sr1~xBax)O·nFe2O3, wherein, n represents molar ratio, meets n=6.11~6.30,0.10≤x≤0.20.
The bonded ferrite magnetic powder of the present embodiment has higher compression density, has good mobility, can be up to
It is injection moulded under more than 91.3% loading, the Br of the injection magnet of acquisition is more than 310mT.
Studied repeatedly to solve problem above inventor, by with barium element within the specific limits to strontium element
Substituted, had the following effects that：(1) the super subsphaeroidal shape growth of ferrite crystal grains；Research is found, compared to the ferrite of sheet
Crystal grain, subsphaeroidal ferrite crystal grains have higher jHc, and have preferable compression property, close with higher compression
Degree；(2) because Ba2+Ionic radius is more than Sr2+Ionic radius, the reaction speed of Ferrite method are inconsistent；Therefore barium element is to strontium
The certain proportion of element substitutes, and ferrite crystal grains size can be controlled to form a various grain sizes point between different range
Cloth, preferably improves the compression property of magnetic powder, has higher pressed density.(3) in the proportion of 0.10≤x≤0.20
Substituted, the high Ms features of strontium ferrite can be retained.
It is well known that jHc depends on granularity of magnet powder, anisotropy constant (HA) and defect.Granularity of magnet powder is smaller, and jHc is got over
It is high；HABigger, jHc is higher.It has been investigated that there is (Sr in magnetic powder1~xBax)O·nFe2O3Chemical formula when because Ba elements
Incorporation, can be very good control strontium ferrite crystal grain towards subsphaeroidal growth so that effectively improve magnetic powder jHc.While because
For Ba2+Ionic radius is more than Sr2+Ionic radius, the reaction speed of Ferrite method is inconsistent, under same calcined temperature, barium
Ferritic crystallite dimension is less than the crystallite dimension of strontium ferrite, therefore a certain proportion of barium element substitution strontium element, magnetic powder tool
There is higher jHc.But the because H of barium ferriteALess than the H of strontium ferriteA, excessive Ba elements add, and will cause magnetic powder jHc
Decline.Research is found, when meeting n=6.11~6.30 and 0.10≤x≤0.20 condition, under equal calcined temperature, and magnetic powder
JHc is improved, and magnetic powder pressed density improves；In x ＞ 0.20, with the rise of temperature, magnetic powder jHc rapid decreases.Have in magnetic powder
There is (Sr1~xBax)O·nFe2O3Chemical formula when because the incorporation of Ba elements, well control ferrite crystal grains shape, iron
Oxysome grain shape tends to spherical development, so as to effectively improve magnetic powder pressed density.
Research also found, because Ba2+Ionic radius is more than Sr2+Ionic radius, the reaction speed of Ferrite method are inconsistent；
When meeting n=6.11~6.30 and 0.10≤x≤0.20 condition, a certain proportion of barium ferrite crystal grain is smaller, and most of
Strontium ferrite crystal grain it is larger, control ferrite crystal grains size forms a preferable grain size distribution between different range,
So as to improve the compression property of magnetic powder well, the pressed density of magnetic powder is improved.And research is found, because a certain amount of barium is first
Element add, under higher calcined temperature, can effectively suppression abnormal grain growth, so as to realize in higher temperature
Lower carry out pre-burning, to further improve the pressed density of magnetic powder.Result of study more than, when meeting n=6.11~6.30
During with 0.10≤x≤0.20 condition, can ensure magnetic powder magnetic powder pressed compact jHc between 220~250kA/m on the premise of, obtain
Magnetic powder pressed density is obtained between 3.50~3.70g/cm3；The filling rate of magnetic powder can bring up to more than 91%, so as to obtain Br high
In the bonded ferrite magnet of 310mT.
Bonded ferrite magnetic powder provided in an embodiment of the present invention, particularly suitable for passing through injection under the conditions of higher powder containing quantity
Molding mode prepares bonded permanent magnet, the Br levels of obtained bonded permanent magnet is reached more than 310mT.
The embodiment of the present invention provides a kind of preparation method of above-mentioned bonded ferrite magnetic powder, as shown in Figure 1, including following step
Suddenly：
Step 101, use technical grade iron oxide red, strontium carbonate and barium carbonate as raw material, according to molecular formula (Sr1~xBax)O·
nFe2O3Carry out dispensing,
Wherein, n represents molar ratio, meets n=6.11~6.30；0.10≤x≤0.20.
Step 102, batch mixing：Raw material is uniformly mixed using mixing apparatus, mixed process addition iron oxide red raw material weight 0.5~
4.0% strontium chloride.
Step 103, pre-burning：Pre-burning is carried out at 1200~1280 DEG C, obtains Preburning material；
Step 104, grinding：Using ball mill to Preburning material coarse crushing, further ground using sand mill afterwards, average grain
Degree control after dry, obtains fine powder at 1.2~1.8 microns.
Step 105, annealing：Anneal at a temperature of 880~980 DEG C to the fine powder.
The bonding that pressed density is 3.50~3.70g/cm3, particle mean size is 1.5~2.5 μm is obtained after annealing
Ferromagnetic oxide powder.
With specific embodiment, the present invention will be described in detail below.
Embodiment 1：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 172g purity be 98% strontium carbonate, 26g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1220 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
Pressed compact detects：20 grams of magnetic powders and 1.4 grams of paraffin are weighed, are uniformly mixed；Then 20 grams of mixtures are weighed, 7MPa's
The pressed compact of Φ 25mm is pressed under pressure；Magnetic property detection is carried out to pressed compact using BH instrument.The pressed compact jHc detected values of the present embodiment
For 240kA/m.
Pressed density (CD values) detects：25 grams of magnetic powders are weighed, the magnetic patch of Φ 25mm is pressed under the pressure of 10Mpa, are examined
The density of pressure measurement base, the CD values detected value of the present embodiment is 3.51g/cm3。
In the present embodiment, bonded magnet can be prepared using injection molding technique using above-mentioned cohesive magnetic powder, it is specific as follows：
Weigh 1000g and bond magnetic powder, 75g nylon 6 and 20g related auxiliaries (silane coupling agent and lubricant TAF), mixing is equal
After even, it be kneaded and be granulated using double screw extruder, melting temperature is 280 DEG C；
Pellet is added into vertical type injection molding machine, is heated to 265 DEG C, injection moulding obtains the cylinder magnetic of 10 × 10mm of Φ
Block, process of injection molding apply the magnetic field intensity of 80000e.
B~H testers can be used to measure the hysteresis curve of cylinder magnetic patch obtained above, obtain magnet performance.This reality
The Br detected values for applying the injection magnetic patch of example are 310mT.
Embodiment 2：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 163g purity be 98% strontium carbonate, 38.5g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1220 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
Method with embodiment 1 carries out pressed compact detection, and the pressed compact jHc detected values of the present embodiment are 244kA/m.
Method with embodiment 1 is compressed density (CD values) detection, and the CD values detected value of the present embodiment is 3.52g/
cm3。
Method with embodiment 1 is detected, and the Br detected values of the injection magnetic patch of the present embodiment are 312mT.
Embodiment 3：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 153g purity be 98% strontium carbonate, 52g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1220 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of the present embodiment are 240kA/m.
The CD values detected value of the present embodiment is 3.53g/cm3。
The Br detected values of the injection magnetic patch of the present embodiment are 312mT.
Embodiment 4：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 172g purity be 98% strontium carbonate, 26g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of the present embodiment are 235kA/m.
The CD values detected value of the present embodiment is 3.54g/cm3。
The Br detected values of the injection magnetic patch of the present embodiment are 311mT.
Embodiment 5：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 163g purity be 98% strontium carbonate, 38.5g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of the present embodiment are 240kA/m.
The CD values detected value of the present embodiment is 3.54g/cm3。
The Br detected values of the injection magnetic patch of the present embodiment are 314mT.
Embodiment 6：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 153g purity be 98% strontium carbonate, 52g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of the present embodiment are 233kA/m.
The CD values detected value of the present embodiment is 3.60g/cm3。
The Br detected values of the injection magnetic patch of the present embodiment are 312mT.
Embodiment 7：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 172g purity be 98% strontium carbonate, 26g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1260 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of the present embodiment are 216kA/m.
The CD values detected value of the present embodiment is 3.56g/cm3。
The Br detected values of the injection magnetic patch of the present embodiment are 314mT.
Embodiment 8：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 163g purity be 98% strontium carbonate, 38.5g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1260 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of the present embodiment are 222kA/m.
The CD values detected value of the present embodiment is 3.62g/cm3。
The Br detected values of the injection magnetic patch of the present embodiment are 315mT.
Embodiment 9：
The process that the present embodiment prepares bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 153g purity be 98% strontium carbonate, 52g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1260 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of the present embodiment are 220kA/m.
The CD values detected value of the present embodiment is 3.65g/cm3。
The Br detected values of the injection magnetic patch of the present embodiment are 315mT.
Comparative example 1：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 192g purity be 98% strontium carbonate, 0g barium carbonates and 30 grams of chlorinations
Strontium, takes strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1220 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 225kA/m.
The CD values detected value of this comparative example is 3.34g/cm3。
This comparative example can not be injection moulded to obtain magnetic patch.
Comparative example 2：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 188g purity be 98% strontium carbonate, 5g purity be 99% carbonic acid
Barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1220 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 230kA/m.
The CD values detected value of this comparative example is 3.42g/cm3。
The Br detected values of the injection magnetic patch of the present embodiment are 315mT.
Comparative example 3：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 182g purity be 98% strontium carbonate, 13g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1220 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 235kA/m.
The CD values detected value of this comparative example is 3.4g/cm3。
This comparative example can not be injection moulded to obtain magnetic patch.
Comparative example 4：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 140g purity be 98% strontium carbonate, 79.8g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1220 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 215kA/m.
The CD values detected value of this comparative example is 3.49g/cm3。
The Br detected values of the injection magnetic patch of this comparative example are 313mT.
Comparative example 5：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 120g purity be 98% strontium carbonate, 106.4g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1220 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 210kA/m.
The CD values detected value of this comparative example is 3.5g/cm3。
The Br detected values of the injection magnetic patch of this comparative example are 307mT.
Comparative example 6：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 192g purity be 98% strontium carbonate, 0g barium carbonates and 30 grams of chlorinations
Strontium, takes strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 210kA/m.
The CD values detected value of this comparative example is 3.35g/cm3。
This comparative example can not be injection moulded to obtain magnetic patch.
Comparative example 7：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 188g purity be 98% strontium carbonate, 5g purity be 99% carbonic acid
Barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 212kA/m.
The CD values detected value of this comparative example is 3.36g/cm3。
This comparative example can not be injection moulded to obtain magnetic patch.
Comparative example 8：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 182g purity be 98% strontium carbonate, 13g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 220kA/m.
The CD values detected value of this comparative example is 3.4g/cm3。
This comparative example can not be injection moulded to obtain magnetic patch.
Comparative example 9：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 140g purity be 98% strontium carbonate, 79.8g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 215kA/m.
The CD values detected value of this comparative example is 3.53g/cm3。
The Br detected values of the injection magnetic patch of this comparative example are 312mT.
Comparative example 10：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 120g purity be 98% strontium carbonate, 106.4g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 208kA/m.
The CD values detected value of this comparative example is 3.54g/cm3。
The Br detected values of the injection magnetic patch of this comparative example are 309mT.
Comparative example 11：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 192g purity be 98% strontium carbonate, 0g barium carbonates and 30 grams of chlorinations
Strontium, takes strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1260 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 185kA/m.
The CD values detected value of this comparative example is 3.39g/cm3。
This comparative example can not be injection moulded to obtain magnetic patch.
Comparative example 12：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 188g purity be 98% strontium carbonate, 5g purity be 99% carbonic acid
Barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1260 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 190kA/m.
The CD values detected value of this comparative example is 3.40g/cm3。
The Br detected values of the injection magnetic patch of this comparative example are 309mT.
Comparative example 13：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 182g purity be 98% strontium carbonate, 13g purity be 99% carbon
Sour barium and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1260 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 205kA/m.
The CD values detected value of this comparative example is 3.39g/cm3。
The Br detected values of the injection magnetic patch of this comparative example are 310mT.
Comparative example 14：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 140g purity be 98% strontium carbonate, 79.8g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1260 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 208kA/m.
The CD values detected value of this comparative example is 3.57g/cm3。
The Br detected values of the injection magnetic patch of this comparative example are 314mT.
Comparative example 15：
The process for preparing bonded ferrite magnetic powder is as follows：
Weigh 1290g purity be 99.2% iron oxide red, 120g purity be 98% strontium carbonate, 106.4g purity be 99%
Barium carbonate and 30 grams of strontium chlorides, take strong mixed machine to be uniformly mixed, then pelletizing, obtains green-ball；
Green-ball sintered at 1240 DEG C 1 it is small when, obtain Preburning material；Pre-burning pellet is slightly broken using dry ball,
When then using sand mill progress fine grinding 3 small, fine grinding powder is obtained after drying；
Fine grinding powder is annealed at 930 DEG C 1 it is small when, and carry out decentralized processing, obtain bonding magnetic powder.
The pressed compact jHc detected values of this comparative example are 200kA/m.
The CD values detected value of this comparative example is 3.58g/cm3。
The Br detected values of the injection magnetic patch of this comparative example are 312mT.
Magnetic patch performance made from above-described embodiment 1~9 and magnetic patch performance made from comparative example 1~15 are contrasted, such as
Shown in table 1.
1 embodiment of table and comparative example test data
According to the test data of table 1, hence it is evident that can obtain：It is (Sr with molecular formula main phase1~xBax)O·nFe2O3Bonding
Ferromagnetic oxide powder, when x is less than 0.1, the pressed density of magnetic powder is integrally relatively low, generally between 3.30~3.40g/cm3, because
This generally can not obtain bonded permanent magnet when powder containing quantity is up to 91.3wt.% by being injection moulded；And when x is less than 0.1,
When calcined temperature is higher than 1240 DEG C, pressed compact jHc drastically declines.
When x is more than 0.2, although the pressed density of magnetic powder further improves, magnetic powder pressed compact jHc is decreased obviously, compared with
Pressed compact jHc is difficult to guarantee between 220~250kA/m, therefore can not effectively be applied.
From table 1, it can obtain：It is (Sr with molecular formula main phase1~xBax)O·nFe2O3Bonded ferrite magnetic powder, when
When n=6.11~6.30 and 0.10≤x≤0.20 condition, the addition of barium element can obtain magnetic powder jHc raisings and magnetic powder at the same time
Pressed density improves, so as to obtain pressed compact jHc between 220~250kA/m and magnetic powder pressed density between 3.40~3.70g/
cm3。
Figure it is seen that the increase with barium element substitution, magnetic powder pressed density improve；As calcined temperature improves,
Magnetic powder pressed density improves.
From figure 3, it can be seen that in x≤0.15, with barium element substitution, increase, magnetic powder pressed compact jHc are gradually stepped up；But
In 0.15 ＜ x≤0.4, with barium element substitution, increase, magnetic powder pressed compact jHc are remarkably decreased.As calcined temperature improves, magnetic
Powder pressed compact jHc declines；In x ＜ 0.1, as calcined temperature improves, magnetic powder jHc falls are more notable.
It these are only the preferred embodiment of the present invention, certainly, the present invention can also have other various embodiments, without departing substantially from this
In the case of spirit and its essence, those skilled in the art make various corresponding changes in accordance with the present invention
And deformation, but these corresponding changes and deformation should all belong to the protection domain of appended claims of the invention.
Claims (8)
1. a kind of bonded ferrite magnetic powder, it is characterised in that the bonded ferrite magnetic powder has the principal phase of following molecular formula：
(Sr1~xBax)O·nFe2O3, wherein, n represents molar ratio, meets n=6.11~6.30,0.10≤x≤0.20.
2. bonded ferrite magnetic powder according to claim 1, it is characterised in that the compression of the bonded ferrite magnetic powder is close
Spend for 3.50~3.70g/cm3。
3. a kind of bonded permanent magnet, it is characterised in that the bonded permanent magnet uses bonded ferrite magnetic as claimed in claim 1 or 2
Powder after being mixed with nylon powder, is prepared as Magnaglo by injection moulding.
4. bonded permanent magnet as claimed in claim 3, it is characterised in that the residual magnetic flux density of the bonded permanent magnet is higher than 310
Milli tesla.
5. a kind of preparation method of bonded ferrite magnetic powder, including：Technical grade iron oxide red, strontium carbonate and barium carbonate are used as raw material,
According to molecular formula (Sr1~xBax)O·nFe2O3Dispensing is carried out, wherein, n represents molar ratio, meets n=6.11~6.30,0.10≤
x≤0.20；The raw material is uniformly mixed, mixed process adds strontium chloride；Pre-burning is carried out at 1200~1280 DEG C, is obtained pre-
Imitation frosted glass；To the Preburning material coarse crushing and grinding, fine powder is obtained after dry；Anneal to the fine powder.
6. preparation method as claimed in claim 5, it is characterised in that the content that the mixed process adds strontium chloride is described
The 0.5~4.0% of iron oxide red raw material weight.
7. preparation method as claimed in claim 5, it is characterised in that the process to the Preburning material coarse crushing and grinding
In, the particle mean size of the fine powder is controlled at 1.2~1.8 microns.
8. such as claim 5 to 7 any one of them preparation method, it is characterised in that it is 880 to carry out annealing to the fine powder
Anneal at a temperature of~980 DEG C to the fine powder.
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| CN112321292A (en) * | 2020-11-05 | 2021-02-05 | 北矿磁材（阜阳）有限公司 | Method for manufacturing sintered ferrite pre-sintering material |
| CN114694909A (en) * | 2022-03-18 | 2022-07-01 | 北矿磁材（阜阳）有限公司 | Ferrite magnetic powder for injection and manufacturing method thereof |
| CN115312283B (en) * | 2022-09-22 | 2023-04-14 | 浙江安特磁材股份有限公司 | High-compaction-density injection magnetic powder and preparation method thereof |
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| CN1540687A (en) * | 2003-04-24 | 2004-10-27 | 同和矿业株式会社 | Spliced magnet and ferrite magnetic powder for splicing same |
| CN101372416A (en) * | 2008-09-22 | 2009-02-25 | 山西国磁磁业有限公司 | Preparation of ferrite rubber magnetic powder |
| CN102351525A (en) * | 2011-07-19 | 2012-02-15 | 吕佳佳 | Manufacture method of permanent magnet ferrite material powder for injection molding |
| CN102976736A (en) * | 2012-12-17 | 2013-03-20 | 北矿磁材科技股份有限公司 | Preparation method of bonded ferrite magnetic powder |
| CN103964828A (en) * | 2014-05-06 | 2014-08-06 | 安徽大学 | High-performance permanent magnet ferrite material and preparing method thereof |
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| CN1540687A (en) * | 2003-04-24 | 2004-10-27 | 同和矿业株式会社 | Spliced magnet and ferrite magnetic powder for splicing same |
| CN101372416A (en) * | 2008-09-22 | 2009-02-25 | 山西国磁磁业有限公司 | Preparation of ferrite rubber magnetic powder |
| CN102351525A (en) * | 2011-07-19 | 2012-02-15 | 吕佳佳 | Manufacture method of permanent magnet ferrite material powder for injection molding |
| CN102976736A (en) * | 2012-12-17 | 2013-03-20 | 北矿磁材科技股份有限公司 | Preparation method of bonded ferrite magnetic powder |
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