CN103771882B - Permanent-magnet ferrite and manufacture method thereof and ultra-thin permanent ferrite magnetic tile - Google Patents
Permanent-magnet ferrite and manufacture method thereof and ultra-thin permanent ferrite magnetic tile Download PDFInfo
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Abstract
The invention discloses a kind of permanent-magnet ferrite, 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 invention also discloses a kind of manufacture method of permanent-magnet ferrite and adopt this permanent-magnet ferrite manufacture method to produce the ultra-thin permanent ferrite magnetic tile obtained.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, therefore its thickness can make less, and thickness is less than or equal to 3.5mm, in application process, effectively can improve the power of small and special electric machine, and reduce the volume of small and special electric machine, expand use range, achieve the object reduced costs with permanent ferrite magnetic tile Substitute For Partial Agglutinate neodymium-iron-boron magnetic shoe.
Description
Technical field
The present invention relates to a kind of permanent-magnet ferrite material, concrete is the manufacture method of a kind of permanent-magnet ferrite and this permanent-magnet ferrite and the ultra-thin permanent ferrite magnetic tile adopting 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 the magnetic property that its raw material sources are wide, cheap and excellent in the research and development of magneticsubstance, has relatively high remanent magnetism (Br), coercive force (jHc) and magnetic energy product (BH) max.
Tile-type magnet is the one in permanent magnet, is mainly used on permanent-magnet machine.Due to the deficiency of the magnetic property of existing permanent-magnet ferrite and the defect of magnetic shoe manufacture method, result in the defect that existing tile-type magnet exists the low and thickness thicker (thickness of existing tile-type magnet is all at more than 6mm) of magnetic property, result in existing micromachine and there is the shortcoming that magnet volume is large and magnetic property is low, strongly limit the application of permanent magnetic 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 effectively can improve magnetic property, and the magnetic shoe adopting this permanent-magnet ferrite manufacture to obtain can not only improve magnetic property, and thickness is less.
For achieving the above object, the invention provides following technical scheme:
The present invention first 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 invention allows for a kind of manufacture method of permanent-magnet ferrite, comprise the steps:
1) prepare burden: prepare burden by following weight percent: 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 obtained preparing burden adopts ball mill wet mixing 1-2 hour;
3) precipitate: the raw material that obtains of precipitation wet mixing, and the moisture content in raw material after precipitation is 32%--35%;
4) compression moulding: the raw material after precipitation is adopted 80-150 ㎏/㎝
2pressure compression moulding;
5) pre-burning: adopt the presintering of push pedal electrical kiln, pre-sintering temperature is 1168-1180 DEG C, and be incubated after 1-2.5 hour, naturally cooling, obtains Preburning material;
6) primary fragmentation: dry type ball mill crushing is carried out to Preburning material, and adopt ultrasonic vibration sieve that the Preburning material of fragmentation is crossed screen sizing;
7) secondary ball milling: adopt material: ball: the ratio of water is the wet method abrasive material of 1:8-12:1.5-2, and the granularity after abrasive material is 0.85-0.90 μm, the slip water ratio 34%-36% after dehydration;
8) shaping: the shaping green density obtained is 2.9-3.8g/ ㎝
2;
9) sinter: adopt two push pedal tunnels electrical kiln to sinter green compact, and the temperature of sintering is 1178 ± 2 DEG C, is incubated after 2-3 hour, is cooled to normal temperature with kiln discharge speed.。
Further, the described 3rd), in step, settling tower or wooden case is adopted to precipitate the raw material that wet mixing obtains.
Further, the described 4th), in step, adopt 100 tons of shaping mouldenpresses to the raw material compression moulding after precipitation.
Further, the described 5th), in step, 36 meter Kun road push pedal electrical kilns are adopted to carry out presintering process to the raw material of compression moulding.
Further, the described 8th), in step, the slip compression moulding that 150 tons of automatic hydraulic presses and Wimet flow channel type mould obtain secondary ball milling is adopted.
Further, the described 9th), in step, adopt 36 meters of two push pedal tunnels electrical kilns to carry out sintering processes to the green compact after shaping, and the vehicle speed that enters of these 36 meters two push pedal tunnels electrical kilns is 1.2-1.5 m/h.
The invention allows for a kind of ultra-thin permanent ferrite magnetic tile, the magnetic shoe adopting the manufacture method manufacture of permanent-magnet ferrite described above to obtain also obtains through mill processing and fabricating, and the thickness of described ultra-thin permanent ferrite magnetic tile is less than or equal to 3.5mm, 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 adds combined ionic replacement amount in the material, thus reaches the object improving magnetic property.
The manufacture method of permanent-magnet ferrite of the present invention have employed presintering under sufficient oxidizing atmosphere, and by setting suitable pre-sintering temperature, fully can generate permanent-magnet ferrite M phase, Preburning material observe under light 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, the folding strength of permanent-magnet ferrite effectively can be improved.
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 make less, thickness is less than or equal to 3.5mm, in application process, effectively can improve the power of small and special electric machine, and reduce the volume of small and special electric machine, expand use range, achieve the object reduced 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 one: 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 two: 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 three: 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 four: 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) prepare burden: prepare burden by following weight percent: 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 obtained preparing burden adopts ball mill wet mixing 1-2 hour, ensure that batch mixing homogeneity;
3) precipitate: adopt settling tower or wooden case to precipitate the raw material that wet mixing obtains, the raw material that precipitation wet mixing obtains, and the moisture content in raw material after precipitation is 32%--35%;
4) compression moulding: adopt 100 tons of shaping mouldenpresses and 80-150 ㎏/㎝
2pressure to precipitation after raw material compression moulding, ensure that the consistence of density, be conducive to solid state reaction during pre-burning;
5) pre-burning: adopt 36 meter Kun road push pedal electrical kilns to carry out presintering process to the raw material of compression moulding, pre-sintering temperature is 1168-1180 DEG C, be incubated after 1-2.5 hour, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can ensure production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: dry type ball mill crushing is carried out to Preburning material, and adopt ultrasonic vibration sieve that the Preburning material of fragmentation is crossed screen sizing, by adopting ultrasonic wave sizing screening, ensure that the consistence of the feed particles of secondary abrasive material, thus reach the consistence of slip particle, effectively can improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the ratio of water is the wet method abrasive material of 1:8-12:1.5-2, and the granularity after abrasive material is 0.85-0.90 μm, the slip water ratio 34%-36% after dehydration;
8) shaping: adopt the slip compression moulding that 150 tons of automatic hydraulic presses and Wimet flow channel type mould obtain secondary ball milling, the shaping green density obtained is 2.9-3.8g/ ㎝
2;
9) sinter: adopts 36 meters of pair push pedal tunnels electrical kilns to carry out sintering processes to the green compact after shaping, and the vehicle speed that enters of these 36 meters two push pedal tunnels electrical kilns is: 1.2-1.5 m/h, the temperature of sintering is 1178 ± 2 DEG C, 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) prepare burden: prepare burden by following weight percent: 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 obtained preparing burden adopts ball mill wet mixing 1 hour, ensure that batch mixing homogeneity;
3) precipitate: adopt settling tower or wooden case to precipitate the raw material that wet mixing obtains, the raw material that precipitation wet mixing obtains, and the moisture content in raw material after precipitation is 32%;
4) compression moulding: adopt 100 tons of shaping mouldenpresses and 150 ㎏/㎝
2pressure to precipitation after raw material compression moulding, ensure that the consistence of density, be conducive to solid state reaction during pre-burning;
5) pre-burning: adopt 36 meter Kun road push pedal electrical kilns to carry out presintering process to the raw material of compression moulding, pre-sintering temperature is 1180 DEG C, be incubated after 1.5 hours, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can ensure production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: dry type ball mill crushing is carried out to Preburning material, and adopt ultrasonic vibration sieve that the Preburning material of fragmentation is crossed screen sizing, by adopting ultrasonic wave sizing screening, ensure that the consistence of the feed particles of secondary abrasive material, thus reach the consistence of slip particle, effectively can improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the ratio of water is the wet method abrasive material of 1:10:1.8, and the granularity after abrasive material is 0.85 μm, the slip water ratio 36% after dehydration;
8) shaping: adopt the slip compression moulding that 150 tons of automatic hydraulic presses and Wimet flow channel type mould obtain secondary ball milling, the shaping green density obtained is 3.8g/ ㎝
2;
9) sinter: adopts 36 meters of two push pedal tunnels electrical kilns to carry out sintering processes to the green compact after shaping, and the vehicle speed that enters of these 36 meters pairs of push pedal tunnels electrical kilns is 1.45 ms/h, the temperature of sintering is 1176 DEG C, 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) prepare burden: prepare burden by following weight percent: 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 obtained preparing burden adopts ball mill wet mixing 2 hours, ensure that batch mixing homogeneity;
3) precipitate: adopt settling tower or wooden case to precipitate the raw material that wet mixing obtains, the raw material that precipitation wet mixing obtains, and the moisture content in raw material after precipitation is 35%;
4) compression moulding: adopt 100 tons of shaping mouldenpresses and 100 ㎏/㎝
2pressure to precipitation after raw material compression moulding, ensure that the consistence of density, be conducive to solid state reaction during pre-burning;
5) pre-burning: adopt 36 meter Kun road push pedal electrical kilns to carry out presintering process to the raw material of compression moulding, pre-sintering temperature is 1168 DEG C, be incubated after 1 hour, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can ensure production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: dry type ball mill crushing is carried out to Preburning material, and adopt ultrasonic vibration sieve that the Preburning material of fragmentation is crossed screen sizing, by adopting ultrasonic wave sizing screening, ensure that the consistence of the feed particles of secondary abrasive material, thus reach the consistence of slip particle, effectively can improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the ratio of water is the wet method abrasive material of 1:8:2, and the granularity after abrasive material is 0.90 μm, the slip water ratio 34% after dehydration;
8) shaping: adopt the slip compression moulding that 150 tons of automatic hydraulic presses and Wimet flow channel type mould obtain secondary ball milling, the shaping green density obtained is 3.2g/ ㎝
2;
9) sinter: adopts 36 meters of two push pedal tunnels electrical kilns to carry out sintering processes to the green compact after shaping, and the vehicle speed that enters of these 36 meters pairs of push pedal tunnels electrical kilns is 1.2 ms/h, the temperature of sintering is 1178 DEG C, 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) prepare burden: prepare burden by following weight percent: 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 obtained preparing burden adopts ball mill wet mixing 1.5 hours, ensure that batch mixing homogeneity;
3) precipitate: adopt settling tower or wooden case to precipitate the raw material that wet mixing obtains, the raw material that precipitation wet mixing obtains, and the moisture content in raw material after precipitation is 33%;
4) compression moulding: adopt 100 tons of shaping mouldenpresses and 80 ㎏/㎝
2pressure to precipitation after raw material compression moulding, ensure that the consistence of density, be conducive to solid state reaction during pre-burning;
5) pre-burning: adopt 36 meter Kun road push pedal electrical kilns to carry out presintering process to the raw material of compression moulding, pre-sintering temperature is 1175 DEG C, be incubated after 2.5 hours, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can ensure production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: dry type ball mill crushing is carried out to Preburning material, and adopt ultrasonic vibration sieve that the Preburning material of fragmentation is crossed screen sizing, by adopting ultrasonic wave sizing screening, ensure that the consistence of the feed particles of secondary abrasive material, thus reach the consistence of slip particle, effectively can improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the ratio of water is the wet method abrasive material of 1:12:1.5, and the granularity after abrasive material is 0.88 μm, the slip water ratio 35% after dehydration;
8) shaping: adopt the slip compression moulding that 150 tons of automatic hydraulic presses and Wimet flow channel type mould obtain secondary ball milling, the shaping green density obtained is 2.9g/ ㎝
2;
9) sinter: adopts 36 meters of two push pedal tunnels electrical kilns to carry out sintering processes to the green compact after shaping, and the vehicle speed that enters of these 36 meters pairs of push pedal tunnels electrical kilns is 1.5 ms/h, the temperature of sintering is 1180 DEG C, 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) prepare burden: prepare burden by following weight percent: 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 obtained preparing burden adopts ball mill wet mixing 2 hours, ensure that batch mixing homogeneity;
3) precipitate: adopt settling tower or wooden case to precipitate the raw material that wet mixing obtains, the raw material that precipitation wet mixing obtains, and the moisture content in raw material after precipitation is 34%;
4) compression moulding: adopt 100 tons of shaping mouldenpresses and 120 ㎏/㎝
2pressure to precipitation after raw material compression moulding, ensure that the consistence of density, be conducive to solid state reaction during pre-burning;
5) pre-burning: adopt 36 meter Kun road push pedal electrical kilns to carry out presintering process to the raw material of compression moulding, pre-sintering temperature is 1170 DEG C, be incubated after 2 hours, naturally cooling, obtain Preburning material, by adopting this calcined temperature, can ensure production high-performance M phase in Preburning material, rare earth ion rate of displacement is higher;
6) primary fragmentation: dry type ball mill crushing is carried out to Preburning material, and adopt ultrasonic vibration sieve that the Preburning material of fragmentation is crossed screen sizing, by adopting ultrasonic wave sizing screening, ensure that the consistence of the feed particles of secondary abrasive material, thus reach the consistence of slip particle, effectively can improve the folding strength of product.
7) secondary ball milling: adopt material: ball: the ratio of water is the wet method abrasive material of 1:10:2, and the granularity after abrasive material is 0.86 μm, the slip water ratio 35% after dehydration;
8) shaping: adopt the slip compression moulding that 150 tons of automatic hydraulic presses and Wimet flow channel type mould obtain secondary ball milling, the shaping green density obtained is 3.5g/ ㎝
2;
9) sinter: adopts 36 meters of two push pedal tunnels electrical kilns to carry out sintering processes to the green compact after shaping, and the vehicle speed that enters of these 36 meters pairs of push pedal tunnels electrical kilns is 1.45 ms/h, the temperature of sintering is 1179 DEG C, 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, the manufacture method of the permanent-magnet ferrite of above-described embodiment five to embodiment eight is adopted 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, folding strength is greater than 150N.The mill processing units of the present embodiment adopts automatic flexible to send formula fully automatic grinder to, ensures that the injury-free and shape of ultra-thin permanent ferrite magnetic tile is tolerance consistence good.Concrete, the thickness of the ultra-thin permanent ferrite magnetic tile of the present embodiment is 3.0mm, and folding strength is 200N.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (6)
1. a manufacture method for permanent-magnet ferrite, is characterized in that: comprise the steps:
1) prepare burden: prepare burden by following weight percent: Fe
2o
3: 81-88 part; SrCO
3: 12-19 part; La
2o
3: 3-5.5 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 obtained preparing burden adopts ball mill wet mixing 1-2 hour;
3) precipitate: the raw material that obtains of precipitation wet mixing, and the moisture content in raw material after precipitation is 32%--35%;
4) compression moulding: the raw material after precipitation is adopted 80-150 ㎏/㎝
2pressure compression moulding;
5) pre-burning: adopt the presintering of push pedal electrical kiln, pre-sintering temperature is 1168-1180 DEG C, and be incubated after 1-2.5 hour, naturally cooling, obtains Preburning material;
6) primary fragmentation: dry type ball mill crushing is carried out to Preburning material, and adopt ultrasonic vibration sieve that the Preburning material of fragmentation is crossed screen sizing;
7) secondary ball milling: adopt material: ball: the ratio of water is the wet method abrasive material of 1:8-12:1.5-2, and the granularity after abrasive material is 0.85-0.90 μm, the slip water ratio 34%-36% after dehydration;
8) shaping: the shaping green density obtained is 2.9-3.8g/ ㎝
2;
9) sinter: adopt two push pedal tunnels electrical kiln to sinter green compact, and the temperature of sintering is 1178 ± 2 DEG C, is incubated after 2-3 hour, is cooled to normal temperature with kiln discharge speed.
2. the manufacture method of permanent-magnet ferrite according to claim 1, is characterized in that: the described 3rd) in step, adopts settling tower or wooden case to precipitate the raw material that wet mixing obtains.
3. the manufacture method of permanent-magnet ferrite according to claim 1, is characterized in that: the described 4th) in step, adopts 100 tons of shaping mouldenpresses to the raw material compression moulding after precipitation.
4. the manufacture method of permanent-magnet ferrite according to claim 1, is characterized in that: the described 5th) in step, adopts 36 meters of roller-way push pedal electrical kilns to carry out presintering process to the raw material of compression moulding.
5. the manufacture method of permanent-magnet ferrite according to claim 1, is characterized in that: the described 8th) in step, adopts the slip compression moulding that 150 tons of automatic hydraulic presses and Wimet flow channel type mould obtain secondary ball milling.
6. the manufacture method of permanent-magnet ferrite according to claim 1, it is characterized in that: the described 9th) in step, adopt 36 meters of two push pedal tunnels electrical kilns to carry out sintering processes to the green compact after shaping, and the vehicle speed that enters of these 36 meters two push pedal tunnels electrical kilns is 1.2-1.5 m/h.
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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 |
| CN106191836B (en) * | 2016-08-03 | 2018-10-23 | 北方工业大学 | Preparation method of magnesium alloy reinforced chemical conversion film |
| CN106975987B (en) * | 2017-03-21 | 2019-03-15 | 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 |
| CN112723871B (en) * | 2020-12-30 | 2023-09-29 | 南京瑞洋新材料科技有限公司 | High-magnetic 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615470A (en) * | 2009-05-18 | 2009-12-30 | 浙江凯文磁钢有限公司 | High-performance permanent magnet ferrite arch magnet and sintering method |
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2013
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615470A (en) * | 2009-05-18 | 2009-12-30 | 浙江凯文磁钢有限公司 | High-performance permanent magnet ferrite arch magnet and sintering method |
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