CN102557608A - Method for preparing sintered ferrimagnet for motor - Google Patents

Method for preparing sintered ferrimagnet for motor Download PDF

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Publication number
CN102557608A
CN102557608A CN2012100353860A CN201210035386A CN102557608A CN 102557608 A CN102557608 A CN 102557608A CN 2012100353860 A CN2012100353860 A CN 2012100353860A CN 201210035386 A CN201210035386 A CN 201210035386A CN 102557608 A CN102557608 A CN 102557608A
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China
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equal
powder
sintering
magnet
ferrimagnet
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CN2012100353860A
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Chinese (zh)
Inventor
胡春涛
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WUXI WANBANG MACHINERY MANUFACTURING FACTORY
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WUXI WANBANG MACHINERY MANUFACTURING FACTORY
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Priority to CN2012100353860A priority Critical patent/CN102557608A/en
Publication of CN102557608A publication Critical patent/CN102557608A/en
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Abstract

The invention discloses a method for preparing sintered ferrimagnet for a motor. The sintered ferrimagnet has a structure of an M type ferrite, and a general formula of the sintered ferrimagnet is Sr1-x-yCexBayFe3n-zCoz, wherein 1-x-y, x, y, z, n and 3n-z respectively refer to the content and a molar ratio of Sr, Ce, Ba and Co; and x is more than or equal to 0.08 and less than or equal to 0.18, y is more than or equal to 0.3 and less than or equal to 0.5, z is more than or equal to 0.7 and less than or equal to 0.9, and n is more than or equal to 2 and less than or equal to 3. The method comprises the following steps of: dispersing SrO powder, CeO powder, BaCO3 powder, Fe2O3 powder and Co3O4 powder which serve as raw materials by using a wet method, and mixing; calcining at high temperature of between 1,220 and 1,240 DEG C; grinding slag blocks by using the wet method to obtain paste water dispersoids of which the grain diameter is about 1 micrometer; pressing to obtain a green compact under the pressure of 30 to 50 Mpa under the condition that the directional magnetic field is between 1.2 and 1.5 T, and drying the green compact to remove moisture; sintering at sintering temperature of between 1,280 and 1,320 DEG C for 210 to 240 minutes; and machining.

Description

A kind of phonomoter is with the preparation method of ferrite sintered body magnet
Technical field
The present invention relates to the motor preparation field, particularly a kind of phonomoter is with the preparation method of ferrite sintered body magnet.
Background technology
The ferrite sintered body magnet is widely used in phonomoter and the generator.Development along with technology; Automobile motor progressively is tending towards small-sized, lightweight, in automobile usefulness, in the motor; From small-sized, light-weighted viewpoint, pursue to keep high Br and have the ferrite sintered magnet of the high HcJ of not demagnetization in the counter magnetic field that carries out taking place when slim.
M type ferrite sintered magnets such as Sr ferrite, Ba ferrite are through following operation manufacturing: (a) operation of carbonate of blending iron oxide and Sr and Ba etc.; (b) carry out the ferrite reaction through pre-burning; Obtain the operation of pre-burning slag; (c) coarse reduction pre-burning slag, and add the SiO that the control sintering is taken action 2, SrCO 3, CaCO 3Deng with the Al that controls HcJ as required 2O 3Or Cr 2O 3And water; And carry out the wet type micro mist and be broken to the operation that median size is the degree of 0.5 μ m, (d) the atomic slurry of ferrite is shaped in magnetic field and exsiccant operation, (e) incinerating operation; Sintered compact carries out shape processing according to application target, makes ferrite sintered magnet.
Specially permit No. 3181559 disclosed be that to have with the hexgonal screw be that principal phase and general formula are expressed as Ca 1-xR x(Fe 12-yM y) zO 19(R selects at least a element from rare earth element that contains Y and Bi, wherein must contain La, and M is Co and/or Ni, and x, y and z satisfy the condition of 0.2≤x≤0.8,0.2≤y≤1.0 and 0.5≤z≤1.2 respectively.) the ferrite sintered magnet of composition.[0018] records and narrates the ferrite sintered magnet have special permission to record and narrate for No. 3181559 among section and the embodiment 6 and compare, have high approximately 2% saturation magnetization (4 π Is) and high approximately 10% anisotropy field (HA) with Sr ferrite (SrM).Ferrite sintered magnet with so high value is predicted and can be obtained the noble potential that can't realize among the SrM.That is to say that obtain the above Br of 4.6kG (460mT), the peak of HcJ can increase about 10%.But the magnetic properties (O of the sample No.2 that records and narrates at the embodiment 2 of No. the 3181559th, special permission 2During=20% sintering) shown in Br=4.4KG (440mT) and HcJ=3.93kOe (313kA/m), this value is lower than anticipation value, room for improvement is big.
Te Kaiping 11-97225 number disclosed is to have with hexaplanar magnet lead ore type ferrite as principal phase; From rare earth element (containing Y) and Bi, selecting at least a element is R; Co or (Co+Zn) when being M, the component ratio of the total of Ba, R, Fe and M is by formula Ba 1-xR x(Fe 12-yM y) zO 19The anisotropy sintered magnet of (but 0.04≤x≤0.9,0.3≤y≤0.8,0.7≤z≤1.2) expression.Particularly the Ca amount is few outside its scope with respect to essentially consist of the present invention for the composition of each the pre-burning style corresponding with the anisotropy sintered magnet of Te Kaiping 11-97225 number table 1 expression.The magnetic properties of the ferrite sintered magnet that obtains in addition, (Br and HcJ) can not fully satisfy the requirement to high performance.
International Publication WO05/027153 number is disclosed to be to have M type ferrite structure; With Sr or the A element of forming by Sr and Ba, contain Y rare earth element in to select at least a R element, Ca, Fe and the Co that promptly must contain La be must element, through pulverizing the ferrite sintered magnet of oxidate magnetic material, shaping and the manufacturing of agglomerating operation.Above-mentioned oxidate magnetic material is with formula (1) A 1-x-yCa xR yFe 2n-zCo zO 19(atom ratio) expression, above-mentioned ferrite sintered magnet is with formula (2) A 1-x-y+aCa X+bR Y+cFe 2n-zCo Z+dO 19(atom ratio) [wherein; Formula (1) and formula (2) satisfy; X, y, z and n represent content and the mol ratio of Ca, R element and Co respectively; A, b, c and d are illustrated respectively in the amount of the A element, Ca, R element and the Co that add in the above-mentioned pulverizing process, 0.03≤x≤0.4,0.1≤y≤0.6,0≤z≤0.4,4≤n≤10, x+y＜1,0.03≤x+b≤0.4,0.1≤y+c≤0.6,0.1≤z+d≤0.4,0.50≤{ (1-x-y+a)/(1-y+a+b) }≤0.97,1.1≤(y+c)/(z+d)≤1.8,1.0≤(y+c)/x≤20 and 0.1≤x/ (z+d)≤1.2] expression.It is more than Ca content to contain Sr and Sr or content (Sr+Ba) at this ferrite sintered magnet.Though the ferrite sintered magnet that International Publication WO05/027153 number is recorded and narrated has high magnetic properties, but still can not fully satisfy the requirement of user to the increasingly stringent of high performance, and the further pursuit that magnetic properties is improved.
Summary of the invention
To the deficiency of prior art, one of the object of the invention is to provide the preparation method of a kind of phonomoter of the temperature dependency with high Br, high HcJ and little HcJ with the ferrite sintered body magnet.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
A kind of phonomoter is with the preparation method of ferrite sintered body magnet, and this ferrite sintered body magnet has M type ferrite structure, has by what formula was represented and forms: Sr 1-x-yCe xBa yFe 3n-zCo zWherein 1-x-y, x, y, z, n and 3n-z represent content and the mol ratio of Sr, Ce, Ba and Co respectively; And satisfy the value of following condition: 0.08≤x≤0.18,0.3≤y≤0.5,0.7≤z≤0.9,2≤n≤3, said preparation method comprises the steps:
1) selects SrO for use, CeO, BaCO 3, Fe 2O 3, Co 3O 4Powder is as the raw material in element source in the said components;
2) form dispersion-s through wet method, or form particle, to form raw mix through dry method;
3) at 1220-1240 ℃ of high-temperature calcination mixture to form clinker, wherein contain required magnetoplumbite phase, described mixture is introduced calcining furnace with the form of dispersion-s or with the particulate form;
4) clinker being carried out wet grinding, is the water dispersion about 1 μ m up to the wherein particle diameter that obtains, and form is a paste, and solid contents is 65-70%;
5) be that 30-50Mpa, directional magnetic field are that the condition of 1.2-1.5T presses down and processes pressed compact with said paste at pressure, and dry this pressed compact is to remove moisture;
6) this pressed compact of sintering, sintering temperature is 1280-1320 ℃, the time is 210-240 minute;
7) material behind the sintering is carried out machining and form the magnet of confirming shape.
Beneficial effect of the present invention is:
1) the ferrite sintered body magnet Br of the present invention's preparation reaches 4.7-4.8kGs, and HcJ reaches 4.2-4.3kOe, and the temperature dependency of HcJ [temperature factor (β)] is little, so the motor low temperature demagnetization amount of this ferrite sintered body magnet of packing into is few.
2) the present invention compares with process method domestic, that produce this product in the world at present that to have material cost low, does not increase auxiliary equipment, and technology is simple, is suitable for advantages such as big industrial production.
Embodiment
Embodiment one
A kind of phonomoter is with the preparation method of ferrite sintered body magnet, and this ferrite sintered body magnet has M type ferrite structure, has by what formula was represented and forms: Sr 1-x-yCe xBa yFe 3n-zCo z, wherein 1-x-y, x, y, z, n and 3n-z represent content and the mol ratio of Sr, Ce, Ba and Co respectively, and satisfy the value of following condition: x=0.08, y=0.5, z=0.7, n≤=3, said preparation method comprises the steps:
1) selects SrO for use, CeO, BaCO 3, Fe 2O 3, Co 3O 4Powder is as the raw material in element source in the said components;
2) form dispersion-s through wet method, or form particle, to form raw mix through dry method;
3) at 1220 ℃ of high-temperature calcination mixtures to form clinker, wherein contain required magnetoplumbite phase, described mixture is introduced calcining furnace with the form of dispersion-s or with the particulate form;
4) clinker being carried out wet grinding, is the water dispersion about 1 μ m up to the wherein particle diameter that obtains, and form is a paste, and solid contents is 65-70%;
5) be that 30Mpa, directional magnetic field are that the condition of 1.5T presses down and processes pressed compact with said paste at pressure, and dry this pressed compact is to remove moisture;
6) this pressed compact of sintering, sintering temperature is 1280 ℃, the time is 240 minutes;
7) material behind the sintering is carried out machining and form the magnet of confirming shape.
Embodiment two
A kind of phonomoter is with the preparation method of ferrite sintered body magnet, and this ferrite sintered body magnet has M type ferrite structure, has by what formula was represented and forms: Sr 1-x-yCe xBa yFe 3n-zCo z, wherein 1-x-y, x, y, z, n and 3n-z represent content and the mol ratio of Sr, Ce, Ba and Co respectively, and satisfy the value of following condition: x=0.18, y=0.3, z=0.9, n=2, said preparation method comprises the steps:
1) selects SrO for use, CeO, BaCO 3, Fe 2O 3, Co 3O 4Powder is as the raw material in element source in the said components;
2) form dispersion-s through wet method, or form particle, to form raw mix through dry method;
3) at 1240 ℃ of high-temperature calcination mixtures to form clinker, wherein contain required magnetoplumbite phase, described mixture is introduced calcining furnace with the form of dispersion-s or with the particulate form;
4) clinker being carried out wet grinding, is the water dispersion about 1 μ m up to the wherein particle diameter that obtains, and form is a paste, and solid contents is 65-70%;
5) be that 50Mpa, directional magnetic field are that the condition of 1.2T presses down and processes pressed compact with said paste at pressure, and dry this pressed compact is to remove moisture;
6) this pressed compact of sintering, sintering temperature is 1320 ℃, the time is 210 minutes;
7) material behind the sintering is carried out machining and form the magnet of confirming shape.
Embodiment three
A kind of phonomoter is with the preparation method of ferrite sintered body magnet, and this ferrite sintered body magnet has M type ferrite structure, has by what formula was represented and forms: Sr 1-x-yCe xBa yFe 3n-zCo z, wherein 1-x-y, x, y, z, n and 3n-z represent content and the mol ratio of Sr, Ce, Ba and Co respectively, and satisfy the value of following condition: x=0.13, y=0.4, z=0.8, n=3, said preparation method comprises the steps:
1) selects SrO for use, CeO, BaCO 3, Fe 2O 3, Co 3O 4Powder is as the raw material in element source in the said components;
2) form dispersion-s through wet method, or form particle, to form raw mix through dry method;
3) at 1230 ℃ of high-temperature calcination mixtures to form clinker, wherein contain required magnetoplumbite phase, described mixture is introduced calcining furnace with the form of dispersion-s or with the particulate form;
4) clinker being carried out wet grinding, is the water dispersion about 1 μ m up to the wherein particle diameter that obtains, and form is a paste, and solid contents is 65-70%;
5) be that 40Mpa, directional magnetic field are that the condition of 1.4T presses down and processes pressed compact with said paste at pressure, and dry this pressed compact is to remove moisture;
6) this pressed compact of sintering, sintering temperature is 1300 ℃, the time is 225 minutes;
7) material behind the sintering is carried out machining and form the magnet of confirming shape.
Applicant's statement; The present invention explains detailed process equipment of the present invention and technical process through the foregoing description; But the present invention is not limited to above-mentioned detailed process equipment and technical process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technical process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.

Claims (1)

1. a phonomoter is characterized in that with the preparation method of ferrite sintered body magnet, and this ferrite sintered body magnet has M type ferrite structure, has by what formula was represented and forms: Sr 1-x-yCe xBa yFe 3n-zCo zWherein 1-x-y, x, y, z, n and 3n-z represent content and the mol ratio of Sr, Ce, Ba and Co respectively; And satisfy the value of following condition: 0.08≤x≤0.18,0.3≤y≤0.5,0.7≤z≤0.9,2≤n≤3, said preparation method comprises the steps:
1) selects SrO for use, CeO, BaCO 3, Fe 2O 3, Co 3O 4Powder is as the raw material in element source in the said components;
2) form dispersion-s through wet method, or form particle, to form raw mix through dry method;
3) at 1220-1240 ℃ of high-temperature calcination mixture to form clinker, wherein contain required magnetoplumbite phase, described mixture is introduced calcining furnace with the form of dispersion-s or with the particulate form;
4) clinker being carried out wet grinding, is the water dispersion about 1 μ m up to the wherein particle diameter that obtains, and form is a paste, and solid contents is 65-70%;
5) be that 30-50Mpa, directional magnetic field are that the condition of 1.2-1.5T presses down and processes pressed compact with said paste at pressure, and dry this pressed compact is to remove moisture;
6) this pressed compact of sintering, sintering temperature is 1280-1320 ℃, the time is 210-240 minute;
7) material behind the sintering is carried out machining and form the magnet of confirming shape.
CN2012100353860A 2012-02-16 2012-02-16 Method for preparing sintered ferrimagnet for motor Withdrawn CN102557608A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107000051A (en) * 2014-08-15 2017-08-01 城市矿业公司 Grain boundary engineering

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107000051A (en) * 2014-08-15 2017-08-01 城市矿业公司 Grain boundary engineering

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Application publication date: 20120711