CN103771882A - Permanent magnetic ferrite and preparation method and ultrathin permanent magnetic ferrite magnetic shoe thereof - Google Patents
Permanent magnetic ferrite and preparation method and ultrathin permanent magnetic ferrite magnetic shoe thereof Download PDFInfo
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Abstract
The invention discloses a permanent magnetic ferrite which comprises the following components in parts by weight: 81-88 parts of Fe2O3, 12-19 parts of SrCO3, 1.2-5.5 parts of La2O3, 0.6-0.8 part of Co2O3, 1.5-4 parts of CaCO3 and 0.3-1.0 part of SiO2. The invention further discloses a preparation method of the permanent magnetic ferrite and an ultrathin permanent magnetic ferrite magnetic shoe produced by adopting the preparation method of the permanent magnetic ferrite. The ultrathin permanent magnetic ferrite magnetic shoe disclosed by the invention not only has a better magnetic performance, but also has better breaking strength which is greater than 150N, so that the ultrathin permanent magnetic ferrite magnetic shoe can be thinner and the thickness is less than or equal to 3.5mm. In the application process, the power of small and special electric machines can be effectively improved, the volume of the small and special electric machines can be effectively reduced, and the using range can be expanded, so that the purpose of lowering the cost by replacing a partially adhered neodymium iron boron magnetic shoe by the permanent magnetic ferrite magnetic shoe is realized.
Description
Technical field
The present invention relates to a kind of permanent-magnet ferrite material, the concrete manufacture method for a kind of permanent-magnet ferrite and this permanent-magnet ferrite and the ultra-thin permanent ferrite magnetic tile that adopts this manufacture method manufacture to obtain.
Background technology
Permanent magnet material is material indispensable in electron trade, is widely used in the fields such as household electrical appliances, automobile, computer, communication, medical treatment, space flight, military affairs.In recent years, permanent-magnet ferrite magneticsubstance occupies critical role with wide, the cheap and excellent magnetic property of its raw material sources in the research and development of magneticsubstance, has relatively high remanent magnetism (Br), coercive force (jHc) and magnetic energy product (BH) max.
Watt type magnet is the one in permanent magnet, is mainly used on permanent-magnet machine.Due to the deficiency of magnetic property and the defect of magnetic shoe manufacture method of existing permanent-magnet ferrite, cause existing watt of type magnet to have the defect of the low and thickness thicker (thickness of existing watt of type magnet is all more than 6mm) of magnetic property, cause existing micromachine to have magnet volume greatly and the low shortcoming of magnetic property, limited widely the application of permanent-magnet ferrite magnet.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of permanent-magnet ferrite and manufacture method thereof and permanent ferrite magnetic tile, this permanent-magnet ferrite can effectively improve magnetic property, and the magnetic shoe that adopts this permanent-magnet ferrite manufacture to obtain not only can improve magnetic property, and thickness is less.
For achieving the above object, the invention provides following technical scheme:
First the present invention has proposed a kind of permanent-magnet ferrite, and the compositions in weight percentage of this permanent-magnet ferrite is: Fe
2o
3: 81-88 part; SrCO
3: 12-19 part; La
2o
3: 1.2-5.5 part; Co
2o
3: 0.6-0.8 part; CaCo
3: 1.5-4 part; SiO
2: 0.3-1.0 part.
The manufacture method that the invention allows for a kind of permanent-magnet ferrite, comprises the steps:
1) batching: by following weight percent batching: Fe
2o
3: 81-88 part; SrCO
3: 12-19 part; La
2o
3: 1.2-5.5 part; Co
2o
3: 0.6-0.8 part; CaCo
3: 1.5-4 part; SiO
2: 0.3-1.0 part;
2) wet mixing: the raw material that batching is obtained adopts ball mill wet mixing 1-2 hour;
3) precipitation: the raw material that obtains of precipitation wet mixing, and moisture content in raw material after precipitation is 32%--35%;
4) compression moulding: the raw material after precipitation is adopted to 80-150 ㎏/㎝
2pressure compression moulding;
5) pre-burning: adopt the presintering of push pedal electrical kiln, pre-sintering temperature is 1168-1180 ℃, is incubated after 1-2.5 hour, and naturally cooling, obtains Preburning material;
6) primary fragmentation: Preburning material is carried out to dry type ball mill crushing, and adopt ultrasonic vibration sieve that broken Preburning material is crossed to screen sizing;
7) secondary ball milling: adopt material: ball: the wet method abrasive material that the ratio of water is 1:8-12:1.5-2, the granularity after abrasive material is 0.85-0.90 μ m, the slip water ratio 34%-36% after dehydration;
8) moulding: the green density that moulding obtains is 2.9-3.8g/ ㎝
2;
9) sintering: adopt two push pedals tunnel electrical kiln to carry out sintering to green compact, and the temperature of sintering is 1178 ± 2 ℃, is incubated after 2-3 hour, be cooled to normal temperature with kiln discharge speed.。
Further, the described the 3rd) in step, the raw material that adopts settling tower or wooden case to obtain wet mixing precipitates.
Further, the described the 4th) in step, the raw material compression moulding after adopting 100 tons of moulding mouldenpresses to precipitation.
Further, the described the 5th), in step, adopt push pedal electrical kiln in 36 meter Kun road to carry out presintering processing to the raw material of compression moulding.
Further, the described the 8th) in step, the slip compression moulding that adopts 150 tons of automatic hydraulic presses and Wimet flow channel type mould to obtain secondary ball milling.
Further, the described the 9th), in step, the green compact after adopting 36 meters of two push pedals tunnel electrical kilns to moulding carry out sintering processes, and the vehicle speed that enters of these 36 meters two push pedals tunnel electrical kilns is 1.2-1.5 m/h.
The invention allows for a kind of ultra-thin permanent ferrite magnetic tile, adopt the magnetic shoe that the manufacture method manufacture of permanent-magnet ferrite described above obtains and obtain through mill processing and fabricating, and the thickness of described ultra-thin permanent ferrite magnetic tile is less than or equal to 3.5mm, and folding strength is greater than 150N.
Further, described mill processing units adopts automatic flexible to send formula fully automatic grinder to.
Beneficial effect of the present invention is:
Permanent-magnet ferrite of the present invention has increased the replacement amount of combined ionic in material, thereby reaches the object that improves magnetic property.
The manufacture method of permanent-magnet ferrite of the present invention has adopted presintering under sufficient oxidizing atmosphere, and by setting suitable pre-sintering temperature, can fully generate permanent-magnet ferrite M phase, Preburning material under light, observe have intensive little and uniform crystal grain occurs, this crystal grain is of a size of 0.6-0.9mm, can obtain better magnetic property; By control granularity in secondary ball milling step, can effectively improve the folding strength of permanent-magnet ferrite.
In summary, ultra-thin permanent ferrite magnetic tile of the present invention not only has better magnetic property, and have and better anti-ly tear intensity open, folding strength is greater than 150N, and therefore its thickness can be made littlely, thickness is less than or equal to 3.5mm, in application process, can effectively improve the power of small and special electric machine, and reduce the volume of small and special electric machine, expand use range, realized the object reducing costs with permanent ferrite magnetic tile Substitute For Partial Agglutinate neodymium-iron-boron magnetic shoe.
Embodiment
Below in conjunction with specific embodiment, the preferred embodiments of the present invention are described in detail.
The compositions in weight percentage of permanent-magnet ferrite of the present invention is: Fe
2o
3: 81-88 part; SrCO
3: 12-19 part; La
2o
3: 1.2-5.5 part; Co
2o
3: 0.6-0.8 part; CaCo
3: 1.5-4 part; SiO
2: 0.3-1.0 part.
embodiment mono-: the compositions in weight percentage of the permanent-magnet ferrite of the present embodiment is: Fe
2o
3: 81 parts; SrCO
3: 19 parts; La
2o
3: 1.2 parts; Co
2o
3: 0.6 part; CaCo
3: 4 parts; SiO
2: 1.0 parts.
embodiment bis-: the compositions in weight percentage of the permanent-magnet ferrite of the present embodiment is: Fe
2o
3: 88 parts; SrCO
3: 12 parts; La
2o
3: 5.5 parts; Co
2o
3: 0.8 part; CaCo
3: 1.5 parts; SiO
2: 0.5 part.
embodiment tri-: the compositions in weight percentage of the permanent-magnet ferrite of the present embodiment is: Fe
2o
3: 87 parts; SrCO
3: 13 parts; La
2o
3: 3 parts; Co
2o
3: 0.7 part; CaCo
3: 2.5 parts; SiO
2: 0.3 part.
embodiment tetra-: the compositions in weight percentage of the permanent-magnet ferrite of the present embodiment is: Fe
2o
3: 85 parts; SrCO
3: 15 parts; La
2o
3: 4 parts; Co
2o
3: 0.75 part; CaCo
3: 3 parts; SiO
2: 0.8 part.
The manufacture method of permanent-magnet ferrite of the present invention, comprises the steps:
1) batching: by following weight percent batching: Fe
2o
3: 81-88 part; SrCO
3: 12-19 part; La
2o
3: 1.2-5.5 part; Co
2o
3: 0.6-0.8 part; CaCo
3: 1.5-4 part; SiO
2: 0.3-1.0 part;
2) wet mixing: the raw material that batching is obtained adopts ball mill wet mixing 1-2 hour, has guaranteed batch mixing homogeneity;
3) precipitation: the raw material that adopts settling tower or wooden case to obtain wet mixing precipitates, the raw material that precipitation wet mixing obtains, and moisture content in raw material after precipitation is 32%--35%;
4) compression moulding: adopt 100 tons of moulding mouldenpresses and 80-150 ㎏/㎝
2the raw material compression moulding of pressure after to precipitation, guaranteed the consistence of density, the solid state reaction while being conducive to pre-burning;
5) pre-burning: adopt push pedal electrical kiln in 36 meter Kun road to carry out presintering processing to the raw material of compression moulding, pre-sintering temperature is 1168-1180 ℃, be incubated after 1-2.5 hour, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can guarantee production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: Preburning material is carried out to dry type ball mill crushing, and adopt ultrasonic vibration sieve that broken Preburning material is crossed to screen sizing, by adopting ultrasonic wave sizing screening, guarantee the consistence of the feed particles of secondary abrasive material, thereby reach the consistence of slip particle, can effectively improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the wet method abrasive material that the ratio of water is 1:8-12:1.5-2, the granularity after abrasive material is 0.85-0.90 μ m, the slip water ratio 34%-36% after dehydration;
8) moulding: the slip compression moulding that adopts 150 tons of automatic hydraulic presses and Wimet flow channel type mould to obtain secondary ball milling, the green density that moulding obtains is 2.9-3.8g/ ㎝
2;
9) sintering: the green compact after adopting 36 meters of two push pedals tunnel electrical kilns to moulding carry out sintering processes, and the vehicle speed that enters of these 36 meters two push pedals tunnel electrical kilns is: 1.2-1.5 m/h, the temperature of sintering is 1178 ± 2 ℃, is incubated after 2-3 hour, is cooled to normal temperature with kiln discharge speed.
embodiment five
The manufacture method of permanent-magnet ferrite of the present invention, comprises the steps:
1) batching: by following weight percent batching: Fe
2o
3: 81 parts; SrCO
3: 19 parts; La
2o
3: 1.2 parts; Co
2o
3: 0.6 part; CaCo
3: 4 parts; SiO
2: 1.0 parts;
2) wet mixing: the raw material that batching is obtained adopts ball mill wet mixing 1 hour, has guaranteed batch mixing homogeneity;
3) precipitation: the raw material that adopts settling tower or wooden case to obtain wet mixing precipitates, the raw material that precipitation wet mixing obtains, and moisture content in raw material after precipitation is 32%;
4) compression moulding: adopt 100 tons of moulding mouldenpresses and 150 ㎏/㎝
2the raw material compression moulding of pressure after to precipitation, guaranteed the consistence of density, the solid state reaction while being conducive to pre-burning;
5) pre-burning: adopt push pedal electrical kiln in 36 meter Kun road to carry out presintering processing to the raw material of compression moulding, pre-sintering temperature is 1180 ℃, be incubated after 1.5 hours, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can guarantee production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: Preburning material is carried out to dry type ball mill crushing, and adopt ultrasonic vibration sieve that broken Preburning material is crossed to screen sizing, by adopting ultrasonic wave sizing screening, guarantee the consistence of the feed particles of secondary abrasive material, thereby reach the consistence of slip particle, can effectively improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the wet method abrasive material that the ratio of water is 1:10:1.8, the granularity after abrasive material is 0.85 μ m, the slip water ratio 36% after dehydration;
8) moulding: the slip compression moulding that adopts 150 tons of automatic hydraulic presses and Wimet flow channel type mould to obtain secondary ball milling, the green density that moulding obtains is 3.8g/ ㎝
2;
9) sintering: the green compact after adopting 36 meters of two push pedals tunnel electrical kilns to moulding carry out sintering processes, and the vehicle speed that enters of these 36 meters two push pedals tunnel electrical kilns is 1.45 ms/h, the temperature of sintering is 1176 ℃, is incubated after 2.5 hours, is cooled to normal temperature with kiln discharge speed.
embodiment six
The manufacture method of permanent-magnet ferrite of the present invention, comprises the steps:
1) batching: by following weight percent batching: Fe
2o
3: 88 parts; SrCO
3: 12 parts; La
2o
3: 5.5 parts; Co
2o
3: 0.8 part; CaCo
3: 1.5 parts; SiO
2: 0.5 part;
2) wet mixing: the raw material that batching is obtained adopts ball mill wet mixing 2 hours, has guaranteed batch mixing homogeneity;
3) precipitation: the raw material that adopts settling tower or wooden case to obtain wet mixing precipitates, the raw material that precipitation wet mixing obtains, and moisture content in raw material after precipitation is 35%;
4) compression moulding: adopt 100 tons of moulding mouldenpresses and 100 ㎏/㎝
2the raw material compression moulding of pressure after to precipitation, guaranteed the consistence of density, the solid state reaction while being conducive to pre-burning;
5) pre-burning: adopt push pedal electrical kiln in 36 meter Kun road to carry out presintering processing to the raw material of compression moulding, pre-sintering temperature is 1168 ℃, be incubated after 1 hour, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can guarantee production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: Preburning material is carried out to dry type ball mill crushing, and adopt ultrasonic vibration sieve that broken Preburning material is crossed to screen sizing, by adopting ultrasonic wave sizing screening, guarantee the consistence of the feed particles of secondary abrasive material, thereby reach the consistence of slip particle, can effectively improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the wet method abrasive material that the ratio of water is 1:8:2, the granularity after abrasive material is 0.90 μ m, the slip water ratio 34% after dehydration;
8) moulding: the slip compression moulding that adopts 150 tons of automatic hydraulic presses and Wimet flow channel type mould to obtain secondary ball milling, the green density that moulding obtains is 3.2g/ ㎝
2;
9) sintering: the green compact after adopting 36 meters of two push pedals tunnel electrical kilns to moulding carry out sintering processes, and the vehicle speed that enters of these 36 meters two push pedals tunnel electrical kilns is 1.2 ms/h, the temperature of sintering is 1178 ℃, is incubated after 2 hours, is cooled to normal temperature with kiln discharge speed.
embodiment seven
The manufacture method of permanent-magnet ferrite of the present invention, comprises the steps:
1) batching: by following weight percent batching: Fe
2o
3: 87 parts; SrCO
3: 13 parts; La
2o
3: 3 parts; Co
2o
3: 0.7 part; CaCo
3: 2.5 parts; SiO
2: 0.3 part;
2) wet mixing: the raw material that batching is obtained adopts ball mill wet mixing 1.5 hours, has guaranteed batch mixing homogeneity;
3) precipitation: the raw material that adopts settling tower or wooden case to obtain wet mixing precipitates, the raw material that precipitation wet mixing obtains, and moisture content in raw material after precipitation is 33%;
4) compression moulding: adopt 100 tons of moulding mouldenpresses and 80 ㎏/㎝
2the raw material compression moulding of pressure after to precipitation, guaranteed the consistence of density, the solid state reaction while being conducive to pre-burning;
5) pre-burning: adopt push pedal electrical kiln in 36 meter Kun road to carry out presintering processing to the raw material of compression moulding, pre-sintering temperature is 1175 ℃, be incubated after 2.5 hours, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can guarantee production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: Preburning material is carried out to dry type ball mill crushing, and adopt ultrasonic vibration sieve that broken Preburning material is crossed to screen sizing, by adopting ultrasonic wave sizing screening, guarantee the consistence of the feed particles of secondary abrasive material, thereby reach the consistence of slip particle, can effectively improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the wet method abrasive material that the ratio of water is 1:12:1.5, the granularity after abrasive material is 0.88 μ m, the slip water ratio 35% after dehydration;
8) moulding: the slip compression moulding that adopts 150 tons of automatic hydraulic presses and Wimet flow channel type mould to obtain secondary ball milling, the green density that moulding obtains is 2.9g/ ㎝
2;
9) sintering: the green compact after adopting 36 meters of two push pedals tunnel electrical kilns to moulding carry out sintering processes, and the vehicle speed that enters of these 36 meters two push pedals tunnel electrical kilns is 1.5 ms/h, the temperature of sintering is 1180 ℃, is incubated after 3 hours, is cooled to normal temperature with kiln discharge speed.
embodiment eight
The manufacture method of permanent-magnet ferrite of the present invention, comprises the steps:
1) batching: by following weight percent batching: Fe
2o
3: 85 parts; SrCO
3: 15 parts; La
2o
3: 4 parts; Co
2o
3: 0.75 part; CaCo
3: 3 parts; SiO
2: 0.8 part;
2) wet mixing: the raw material that batching is obtained adopts ball mill wet mixing 2 hours, has guaranteed batch mixing homogeneity;
3) precipitation: the raw material that adopts settling tower or wooden case to obtain wet mixing precipitates, the raw material that precipitation wet mixing obtains, and moisture content in raw material after precipitation is 34%;
4) compression moulding: adopt 100 tons of moulding mouldenpresses and 120 ㎏/㎝
2the raw material compression moulding of pressure after to precipitation, guaranteed the consistence of density, the solid state reaction while being conducive to pre-burning;
5) pre-burning: adopt push pedal electrical kiln in 36 meter Kun road to carry out presintering processing to the raw material of compression moulding, pre-sintering temperature is 1170 ℃, be incubated after 2 hours, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can guarantee production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: Preburning material is carried out to dry type ball mill crushing, and adopt ultrasonic vibration sieve that broken Preburning material is crossed to screen sizing, by adopting ultrasonic wave sizing screening, guarantee the consistence of the feed particles of secondary abrasive material, thereby reach the consistence of slip particle, can effectively improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the wet method abrasive material that the ratio of water is 1:10:2, the granularity after abrasive material is 0.86 μ m, the slip water ratio 35% after dehydration;
8) moulding: the slip compression moulding that adopts 150 tons of automatic hydraulic presses and Wimet flow channel type mould to obtain secondary ball milling, the green density that moulding obtains is 3.5g/ ㎝
2;
9) sintering: the green compact after adopting 36 meters of two push pedals tunnel electrical kilns to moulding carry out sintering processes, and the vehicle speed that enters of these 36 meters two push pedals tunnel electrical kilns is 1.45 ms/h, the temperature of sintering is 1179 ℃, is incubated after 2.5 hours, is cooled to normal temperature with kiln discharge speed.
embodiment nine
Ultra-thin permanent ferrite magnetic tile of the present invention, adopt the manufacture method of the permanent-magnet ferrite of above-described embodiment five to embodiment eight to obtain magnetic shoe, and this magnetic shoe is machined to setting size through mill, and the thickness of ultra-thin permanent ferrite magnetic tile of the present invention is less than or equal to 3.5mm, and folding strength is greater than 150N.The mill processing units of the present embodiment adopts automatic flexible to send formula fully automatic grinder to, guarantees that the injury-free and shape of ultra-thin permanent ferrite magnetic tile is tolerance high conformity.Concrete, the thickness of the ultra-thin permanent ferrite magnetic tile of the present embodiment is 3.0mm, folding strength is 200N.
Finally explanation is, above preferred embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is described in detail by above preferred embodiment, but those skilled in the art are to be understood that, can make various changes to it in the form and details, and not depart from the claims in the present invention book limited range.
Claims (9)
1. a permanent-magnet ferrite, is characterized in that: the compositions in weight percentage of this permanent-magnet ferrite is: Fe
2o
3: 81-88 part; SrCO
3: 12-19 part; La
2o
3: 1.2-5.5 part; Co
2o
3: 0.6-0.8 part; CaCo
3: 1.5-4 part; SiO
2: 0.3-1.0 part.
2. a manufacture method for permanent-magnet ferrite, is characterized in that: comprise the steps:
1) batching: by following weight percent batching: Fe
2o
3: 81-88 part; SrCO
3: 12-19 part; La
2o
3: 1.2-5.5 part; Co
2o
3: 0.6-0.8 part; CaCo
3: 1.5-4 part; SiO
2: 0.3-1.0 part;
2) wet mixing: the raw material that batching is obtained adopts ball mill wet mixing 1-2 hour;
3) precipitation: the raw material that obtains of precipitation wet mixing, and moisture content in raw material after precipitation is 32%--35%;
4) compression moulding: the raw material after precipitation is adopted to 80-150 ㎏/㎝
2pressure compression moulding;
5) pre-burning: adopt the presintering of push pedal electrical kiln, pre-sintering temperature is 1168-1180 ℃, is incubated after 1-2.5 hour, and naturally cooling, obtains Preburning material;
6) primary fragmentation: Preburning material is carried out to dry type ball mill crushing, and adopt ultrasonic vibration sieve that broken Preburning material is crossed to screen sizing;
7) secondary ball milling: adopt material: ball: the wet method abrasive material that the ratio of water is 1:8-12:1.5-2, the granularity after abrasive material is 0.85-0.90 μ m, the slip water ratio 34%-36% after dehydration;
8) moulding: the green density that moulding obtains is 2.9-3.8g/ ㎝
2;
9) sintering: adopt two push pedals tunnel electrical kiln to carry out sintering to green compact, and the temperature of sintering is 1178 ± 2 ℃, is incubated after 2-3 hour, be cooled to normal temperature with kiln discharge speed.
3. the manufacture method of permanent-magnet ferrite according to claim 2, is characterized in that: the described the 3rd) in step, the raw material that adopts settling tower or wooden case to obtain wet mixing precipitates.
4. the manufacture method of permanent-magnet ferrite according to claim 2, is characterized in that: the described the 4th) in step, and the raw material compression moulding after adopting 100 tons of moulding mouldenpresses to precipitation.
5. the manufacture method of permanent-magnet ferrite according to claim 2, is characterized in that: the described the 5th) in step, adopt push pedal electrical kiln in 36 meter Kun road to carry out presintering processing to the raw material of compression moulding.
6. the manufacture method of permanent-magnet ferrite according to claim 2, is characterized in that: the described the 8th) in step, and the slip compression moulding that adopts 150 tons of automatic hydraulic presses and Wimet flow channel type mould to obtain secondary ball milling.
7. the manufacture method of permanent-magnet ferrite according to claim 2, it is characterized in that: the described the 9th) in step, green compact after adopting 36 meters of two push pedals tunnel electrical kilns to moulding carry out sintering processes, and the vehicle speed that enters of these 36 meters two push pedals tunnel electrical kilns is 1.2-1.5 m/h.
8. a ultra-thin permanent ferrite magnetic tile, it is characterized in that: adopt the magnetic shoe that the manufacture method manufacture of permanent-magnet ferrite obtains as described in claim 2-7 any one and obtain through mill processing and fabricating, and the thickness of described ultra-thin permanent ferrite magnetic tile is less than or equal to 3.5mm, and folding strength is greater than 150N.
9. ultra-thin permanent ferrite magnetic tile according to claim 8, is characterized in that: described mill processing units adopts automatic flexible to send formula fully automatic grinder to.
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| CN104030670A (en) * | 2014-06-09 | 2014-09-10 | 中钢集团安徽天源科技股份有限公司 | Method for regulating shrinking percentage of strontium ferrite pre-sintering material |
| CN106191836A (en) * | 2016-08-03 | 2016-12-07 | 北方工业大学 | Preparation method of magnesium alloy reinforced chemical conversion film |
| CN106975987A (en) * | 2017-03-21 | 2017-07-25 | 横店集团东磁股份有限公司 | A kind of not uniform thickness ferrite magnetic shoe and preparation method thereof |
| CN111138178A (en) * | 2020-01-17 | 2020-05-12 | 湖北神电汽车电机有限公司 | Novel magnetic pole material for starting and stopping permanent magnet starter and preparation method thereof |
| CN112321294A (en) * | 2020-11-04 | 2021-02-05 | 重庆凌达磁材科技有限公司 | Ferrite permanent magnetic material and preparation method thereof |
| CN112723871A (en) * | 2020-12-30 | 2021-04-30 | 南京瑞洋新材料科技有限公司 | High-magnetism permanent magnetic ferrite magnetic shoe and preparation method thereof |
| CN116693308A (en) * | 2023-05-24 | 2023-09-05 | 南京溧水金洪磁性元件有限公司 | Technological method for improving fracture limit of permanent ferrite magnetic shoe device |
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