CN1529333A - Process for producing rare-earth permanent-magnetic material injection-molded magnet - Google Patents
Process for producing rare-earth permanent-magnetic material injection-molded magnet Download PDFInfo
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- CN1529333A CN1529333A CNA2003101048669A CN200310104866A CN1529333A CN 1529333 A CN1529333 A CN 1529333A CN A2003101048669 A CNA2003101048669 A CN A2003101048669A CN 200310104866 A CN200310104866 A CN 200310104866A CN 1529333 A CN1529333 A CN 1529333A
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Abstract
Characters of the technique are as following: preparing solution of sodium silicate, diluting acid solution by using water; pouring fast quenching powder to prepared solution of sodium silicate, mixing round; coating diluted acid solution on surface of neodymium iron boron powder evenly, forming resultant of reaction; standing; rinsing magnetic powder by using ethanol, drying it till liquid not be seen; airing; drying dehydration; mixing treated magnetic powder with chymistry auxiliaries being added, granulating; obtaining magnet in diversified shapes through injection moulding by using magneticparticle as raw material; magnetizing; advantages of the invention are simple production, stable performances, low cost.
Description
Technical field
The present invention relates to the magnetic technology field, particularly a kind of production technology of rare earths permanent magnetic material injection moulding magnet.
Background technology
The present invention of day nineteen eighty-three neodymium iron boron powder sintering process, the magnet of making and traditional ferrite sintered method, the casting aluminium nickel cobalt (Al-Ni-Co) and the rare earth samarium-cobalt permanent-magnetic material in modern age are compared, revolutionary growth is arranged aspect magnetic property, its magnetic energy product (BH) increases 5-20 doubly than the magnetic property of traditional permanent magnetic material, the technology of producing neodymium iron boron at present mainly contains sintering process, pressing, four kinds of spreading and extrusion molding and injections, wherein the key of injection is to guarantee that the magnetic grain has enough flowabilities, under the prerequisite of mouldability and intensity, the loading of magnetisable material is reached maximum; When standing high-temperature process, try hard to make burning and high-temperature magnetic attenuation factor to drop to minimum, because in the neodymium iron boron magnetic powder, neodymium metal is rare earth element in the periodic table of elements, the element that belongs to very easily oxidation, rising along with temperature, its reaction speed will be doubled and redoubled, if the surface oxidation of neodymium metal iron boron powder is serious under 250-260 ℃ temperature, magnetisable material is oxidized into non-magnetic metal oxide, if this phenomenon is not taken effective measures, will make fast quenching neodymium iron boron magnetic decline 20-40%.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can solve the oxidational losses of neodymium iron boron injection moulding magnet preferably, make the production technology of the rare earths permanent magnetic material injection moulding magnet that magnetic loss reduces.
The present invention is achieved in that and it is characterized in that:
1.1, the prepare silicon acid sodium solution, and with the acid solution dilute with water;
1.2, the neodymium iron boron quenched powder poured in the sodium silicate solution that has prepared stirs;
1.3, the acid solution after the dilution evenly is coated in neodymium iron boron powder surface, form reaction product;
1.4, leave standstill;
1.5, use the alcohol flushing magnetic, control is done to loseing liquid;
1.6, dry;
1.7, drying and dehydrating;
1.8, the magnetic of handling is added mixing, the granulation of chemical assistant again;
1.9, magnetic-particle is injection molded into the magnet of different shape as raw material;
2.0, magnetize.
The present invention can make the neodymium iron boron quenched powder under sodium silicate solution and acid solution reaction condition; evenly wrapped up one deck silicate solution; gradually become silicic acid gel having under the electrolyte condition; again under certain condition water content height, soft and transparent resilient gel after processed; form the nonmetal diaphragm of one deck at neodymium iron boron quenched powder particle surface, make it basic and O in heating process
2, H
2O is in isolation, thereby it is minimum to guarantee that fast quenching Nd-Fe-B powder magnetic loss in process of production drops to, and its advantage is to produce simple, stable performance, low production cost.
Embodiment;
Embodiment 1
Select 100 purposes, 1000 gram magnetics, sodium metasilicate 10 grams, concentration is 85% sulfuric acid 5 grams.
1.1 the prepare silicon acid sodium solution is with concentrated sulfuric acid dilute with water;
1.2, the neodymium iron boron quenched powder is poured in the sodium silicate solution that has prepared, stirred 8 minutes;
1.3, the sulfuric acid solution after the dilution is coated in neodymium iron boron powder surface uniformly, form reaction product, the time is 25 minutes;
1.4, leave standstill;
1.5, use the alcohol flushing magnetic, control is done to loseing liquid;
1.6, to dry, the time is 90 minutes;
1.7, under 80 ℃ of conditions of drying and dehydrating 6-12 hour;
1.8, the magnetic of handling is added mixing, the granulation of chemical assistant again;
1.9, magnetic-particle is injection molded into the magnet of different shape as raw material;
2.0, magnetize.
Described chemical assistant is lubricant, antioxidant, age resistor and plasticizer.
Embodiment 2
Select 120 purposes 1000 gram magnetics, sodium metasilicate 7 grams, concentration is that 90% phosphoric acid is 3.5 grams.
1.1 the prepare silicon acid sodium solution is with the SPA dilute with water;
1.2, the neodymium iron boron quenched powder is poured in the silicon sodium solution that has prepared, stirred 10 minutes;
1.3, the phosphoric acid solution after the dilution is coated in neodymium iron boron powder surface uniformly, form reaction product, the time is 30 minutes;
1.4, leave standstill;
1.5, use the alcohol flushing magnetic, control is done to loseing liquid;
1.6, to dry, the time is 60 minutes;
1.7, under 100 ℃ of conditions of drying and dehydrating 3-4 hour;
1.8, the magnetic of handling is added mixing, the granulation of chemical assistant again;
1.9, magnetic-particle is injection molded into the magnet of different shape as raw material;
2.0, magnetize.
Described chemical assistant is lubricant, antioxidant, age resistor and plasticizer.
Embodiment 3
Select 120 purposes, 1000 gram magnetics, sodium metasilicate 18 grams, concentration is 75% hydrochloric acid 8 grams.
1.1 the prepare silicon acid sodium solution is with the concentrated hydrochloric acid dilute with water;
1.2, the neodymium iron boron quenched powder is poured in the silicon sodium solution that has prepared, stirred 15 minutes;
1.3, the hydrochloric acid solution after the dilution is coated in neodymium iron boron powder surface uniformly, form reaction product, the time is 20 minutes;
1.4, leave standstill;
1.5, use the alcohol flushing magnetic, control is done to loseing liquid;
1.6, to dry, the time is 120 minutes;
1.7, under 90 ℃ of conditions of drying and dehydrating 4-5 hour;
1.8, the magnetic of handling is added mixing, the granulation of chemical assistant again;
1.9, magnetic-particle is injection molded into the magnet of different shape as raw material;
2.0, magnetize.
Described chemical assistant is lubricant, antioxidant, age resistor and plasticizer.
Claims (4)
1, a kind of production technology of rare earths permanent magnetic material injection moulding magnet is characterized in that:
1.1 the prepare silicon acid sodium solution is with the acid solution dilute with water;
1.2, the neodymium iron boron quenched powder poured in the sodium silicate solution that has prepared stirs;
1.3, the acid solution after the dilution is coated in neodymium iron boron powder surface uniformly, form reaction product;
1.4, leave standstill;
1.5, use the alcohol flushing magnetic, control is done to loseing liquid;
1.6, dry;
1.7, drying and dehydrating;
1.8, the magnetic of handling is added mixing, the granulation of chemical assistant again;
1.9, magnetic-particle is injection molded into the magnet of different shape as raw material;
2.0, magnetize.
2, the described rare earths permanent magnetic material of root a tree name claim 1 is injected into the production technology of magnet, it is characterized in that per 1000 parts of magnetics select sodium metasilicate 7-18 part for use, acid solution 35-8 part.
3, the described rare earths permanent magnetic material of root a tree name claim 1 is injected into the production technology of magnet, it is characterized in that acid solution is sulfuric acid or phosphoric acid or hydrochloric acid.
4, the described rare earths permanent magnetic material of root a tree name claim 1 is injected into the production technology of magnet, it is characterized in that chemical assistant is lubricant, antioxidant, age resistor and plasticizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101048669A CN1529333A (en) | 2003-10-20 | 2003-10-20 | Process for producing rare-earth permanent-magnetic material injection-molded magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101048669A CN1529333A (en) | 2003-10-20 | 2003-10-20 | Process for producing rare-earth permanent-magnetic material injection-molded magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1529333A true CN1529333A (en) | 2004-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2003101048669A Pending CN1529333A (en) | 2003-10-20 | 2003-10-20 | Process for producing rare-earth permanent-magnetic material injection-molded magnet |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100593828C (en) * | 2007-04-06 | 2010-03-10 | 浙江工业大学 | Method for preparing NdFeB/PPS injection moulding particle material |
| CN106340366A (en) * | 2016-08-31 | 2017-01-18 | 横店集团东磁股份有限公司 | Rare earth permanent magnetic granules for injection molding, and preparation method of rare earth permanent magnetic granules |
| CN112002512A (en) * | 2020-10-29 | 2020-11-27 | 宁波合力磁材技术有限公司 | Anti-corrosion sintered neodymium iron boron magnetic material and preparation process thereof |
-
2003
- 2003-10-20 CN CNA2003101048669A patent/CN1529333A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100593828C (en) * | 2007-04-06 | 2010-03-10 | 浙江工业大学 | Method for preparing NdFeB/PPS injection moulding particle material |
| CN106340366A (en) * | 2016-08-31 | 2017-01-18 | 横店集团东磁股份有限公司 | Rare earth permanent magnetic granules for injection molding, and preparation method of rare earth permanent magnetic granules |
| CN112002512A (en) * | 2020-10-29 | 2020-11-27 | 宁波合力磁材技术有限公司 | Anti-corrosion sintered neodymium iron boron magnetic material and preparation process thereof |
| CN112002512B (en) * | 2020-10-29 | 2021-03-02 | 宁波合力磁材技术有限公司 | Anti-corrosion sintered neodymium iron boron magnetic material and preparation process thereof |
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