CN103011795A - Preparation method of magnetic material for preparing built-in antenna - Google Patents
Preparation method of magnetic material for preparing built-in antenna Download PDFInfo
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- CN103011795A CN103011795A CN2012104752484A CN201210475248A CN103011795A CN 103011795 A CN103011795 A CN 103011795A CN 2012104752484 A CN2012104752484 A CN 2012104752484A CN 201210475248 A CN201210475248 A CN 201210475248A CN 103011795 A CN103011795 A CN 103011795A
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Abstract
The invention relates to a preparation method of a magnetic material for preparing a built-in antenna. The preparation method comprises the following steps of: placing 58.2-58.5 percent of iron oxide, 19.2-19.5 percent of barium carbonate and 19.2-19.5 percent of cobaltous oxide into a smelting furnace for smelting, adding 0.02-0.04 percent of yttrium and 0.01-0.03 percent of thorium into a mixture after completely smelting, continuously insulating, and then rapidly cooling to obtain a foil-shaped ferrite; crushing 1.5-3.5 percent of silicate glass and the ferrite into powder, fully mixing, and adding a binding agent; and pressing the mixture into a blank, and then calcining the blank at a temperature of 1000-1100 DEG C.
Description
Technical field
The invention belongs to field of magnetic material, refer to especially a kind of preparation method of the magneticsubstance for the manufacture of built-in antenna.
Background technology
According to movability or the portable requirement to communication terminal, the antenna that uses for wireless data transmission is required to be built in the mobile termination, with the size of reduction terminal.
Because antenna is made based on the dielectric substance with high-k, yet existing material and manufacture method all can't be implemented in the size that reduces antenna when increasing the data corresponding bandwidth.Therefore, the material that need to realize from the angle of physics increasing data transfer bandwidth is realized combination between the two.Ferrite magnetic material with permanent-magnetic property is used for becoming possibility as the material of built-in antenna.
But simple ferrite magnetic material can't reach the ability that needs fully because of magneticflux-density and coercitive restriction.But find by research, by to adding some element in the ferrite magnetic material, can increase the performance of ferrite magnetic material, satisfy the requirement as built-in antenna.
A kind of method and ferrite magneticsubstance of producing the ferrite magneticsubstance of built-in antenna is provided among the Chinese patent application CN2010800410129.But added too much alkali metal in this technology, can not reach the optimum performance of the magneticsubstance that uses as antenna.
Summary of the invention
The objective of the invention is that prior art is proposed one and improve technical scheme, reduce alkali-metal ratio and improve the performance of ferrite magnetic material by adding rare earth element.
The present invention is achieved by the following technical solutions:
A kind of preparation method who makes the magneticsubstance of built-in antenna,
Form according to the cobalt oxide of the barium carbonate of the ferric oxide of 58.2-58.5%, 19.2-19.5%, 19.2-19.5% and to put into smelting furnace and carry out melting, smelting temperature is 1350 ± 30 ℃, continue insulation 2-4 hour to the thorium that wherein adds by the yttrium that forms the 0.02-0.04% that calculates and 0.01-0.03% until completely melted, then fast cooling obtains the foil-like ferrite;
Silicate glass with 1.5-3.5% is crushed to together powder and fully mixes and add binding agent with ferrite again;
Under 500-700MPa pressure, be pressed on demand blank, and at 450-500 ℃ of lower pre-burning 3-5 hour to remove binding agent; And then 1000-1100 ℃ of lower calcining 2-4 hour.
In the described silicate glass by weight percentage composition comprise, the boron oxide of 10-15%, the Lithium Oxide 98min of 3-5%, the potassium oxide of 3-5% or in the sodium oxide one or both the combination, 3-5% barium oxide.
Described yttrium and thorium are that the mode with yttrium iron alloy and thorium iron alloy adds.
Cooling rate remains on 1.2-1.5 ℃/minute.
It is described that what be crushed to that powder adopts is that planetary mill ground 2-4 hour.
Press powder weight than being 5-10% adding binding agent.
The beneficial effect that the present invention compares with prior art is:
By in technical scheme, adding rare earth element, improved the performance of ferrite magnetic material; And relatively reduced alkali-metal content.
Embodiment
Below describe technical scheme of the present invention in detail by specific embodiment.
A kind of magneticsubstance for the manufacture of built-in antenna, its composition comprises by weight percentage, the cobalt oxide of the ferric oxide of 58.2-58.5%, the barium carbonate of 19.2-19.5%, 19.2-19.5%, the thorium of the silicate glass of 1.5-3.5%, the yttrium of 0.02-0.04% and 0.01-0.03%.
In the described silicate glass by weight percentage composition comprise, the boron oxide of 10-15%, the Lithium Oxide 98min of 3-5%, the potassium oxide of 3-5% or in the sodium oxide one or both the combination, 3-5% barium oxide.
Its preparation method is:
Form according to the cobalt oxide of the barium carbonate of the ferric oxide of 58.2-58.5%, 19.2-19.5%, 19.2-19.5% and to put into smelting furnace and carry out melting, smelting temperature is 1350 ± 30 ℃, continue insulation 2-4 hour to wherein adding by forming the yttrium iron alloy and the thorium iron alloy that calculate until completely melted, then fast cooling, cooling rate remains on 1.2-1.5 ℃/minute, obtains the foil-like ferrite; The yttrium iron alloy that adds and thorium iron alloy are at first preparation also can outsourcing, and the yttrium weight percentage in its yttrium iron alloy is between 2.5-3.5%; The weight percentage of thorium is between 1.2-2% in the thorium iron alloy.This two classes alloy be prepared as prior art.
Silicate glass with 1.5-3.5% is crushed to powder and fully mixing together with ferrite again; What adopt is that planetary mill ground 2-4 hour, is that 5-10% adds binding agent by weight with the powder that obtains, and the binding agent of selecting is common used material such as polyvinyl alcohol etc.;
Under 500-700MPa pressure, be pressed on demand blank, and at 450-500 ℃ of lower pre-burning 3-5 hour to remove binding agent; And then 1000-1100 ℃ of lower calcining 2-4 hour.
Embodiment 1
Ferric oxide according to 58.2%, 19.5% barium carbonate, 19.5% cobalt oxide form to be put into smelting furnace and carries out melting, smelting temperature is 1350 ± 30 ℃, continue insulation 2 hours to wherein adding by forming the yttrium iron alloy that contains yttrium 0.03% and thoriated 0.015% and the thorium iron alloy that calculate until completely melted, then fast cooling, cooling rate remains on 1.5 ℃/minute, obtains the foil-like ferrite; The yttrium iron alloy that adds and thorium iron alloy are outsourcing, and the yttrium weight percentage in its yttrium iron alloy is between 2.5%; The weight percentage of thorium obtains needed amount by mathematical computations in the thorium iron alloy between 1.5%.This two classes alloy be prepared as prior art.
Again the silicate glass of the weight percent that calculates is crushed to powder together with ferrite and fully mixes; What adopt is that planetary mill ground 3 hours, is 6% adding binding agent by weight with the powder that obtains, and the binding agent of selecting is common used material such as polyvinyl alcohol;
Under 550MPa pressure, be pressed on demand blank, and 450-500 ℃ of lower pre-burning 3 hours to remove binding agent; And then 1000-1100 ℃ of lower calcining 3 hours.
Embodiment 2
Ferric oxide according to 58.4%, 19.2% barium carbonate, 19.2% cobalt oxide form to be put into smelting furnace and carries out melting, smelting temperature is 1350 ± 30 ℃, continue insulation 2 hours to wherein adding by forming the yttrium iron alloy that contains yttrium 0.02% and thoriated 0.02% and the thorium iron alloy that calculate until completely melted, then fast cooling, cooling rate remains on 1.5 ℃/minute, obtains the foil-like ferrite; The yttrium iron alloy that adds and thorium iron alloy are outsourcing, and the yttrium weight percentage in its yttrium iron alloy is between 2.5%; The weight percentage of thorium obtains needed amount by mathematical computations in the thorium iron alloy between 1.5%.This two classes alloy be prepared as prior art.
Again the silicate glass of the weight percent that calculates is crushed to powder together with ferrite and fully mixes; What adopt is that planetary mill ground 3 hours, is 6% adding binding agent by weight with the powder that obtains, and the binding agent of selecting is common used material such as polyvinyl alcohol;
Under 550MPa pressure, be pressed on demand blank, and 450-500 ℃ of lower pre-burning 3 hours to remove binding agent; And then 1000-1100 ℃ of lower calcining 3 hours.
Claims (6)
1. preparation method who makes the magneticsubstance of built-in antenna is characterized in that:
Form according to the cobalt oxide of the barium carbonate of the ferric oxide of 58.2-58.5%, 19.2-19.5%, 19.2-19.5% and to put into smelting furnace and carry out melting, smelting temperature is 1350 ± 30 ℃, continue insulation 2-4 hour to the thorium that wherein adds by the yttrium that forms the 0.02-0.04% that calculates and 0.01-0.03% until completely melted, then fast cooling obtains the foil-like ferrite;
Silicate glass with 1.5-3.5% is crushed to together powder and fully mixes and add binding agent with ferrite again;
Under 500-700MPa pressure, be pressed on demand blank, and at 450-500 ℃ of lower pre-burning 3-5 hour to remove binding agent; And then 1000-1100 ℃ of lower calcining 2-4 hour.
2. the preparation method of the magneticsubstance of manufacturing built-in antenna according to claim 1, it is characterized in that: in the described silicate glass by weight percentage composition comprise, the boron oxide of 10-15%, the Lithium Oxide 98min of 3-5%, the potassium oxide of 3-5% or one or both combinations in the sodium oxide, the barium oxide of 3-5%.
3. the preparation method of the magneticsubstance of manufacturing built-in antenna according to claim 1 is characterized in that: described yttrium and thorium are that the mode with yttrium iron alloy and thorium iron alloy adds.
4. the preparation method of the magneticsubstance of manufacturing built-in antenna according to claim 1, it is characterized in that: cooling rate remains on 1.2-1.5 ℃/minute.
5. the preparation method of the magneticsubstance of manufacturing built-in antenna according to claim 1 is characterized in that: described what be crushed to that powder adopts is that planetary mill ground 2-4 hour.
6. the preparation method of the magneticsubstance of manufacturing built-in antenna according to claim 1 is characterized in that: press powder weight than being 5-10% adding binding agent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104752484A CN103011795A (en) | 2012-11-19 | 2012-11-19 | Preparation method of magnetic material for preparing built-in antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104752484A CN103011795A (en) | 2012-11-19 | 2012-11-19 | Preparation method of magnetic material for preparing built-in antenna |
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| CN103011795A true CN103011795A (en) | 2013-04-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62107437A (en) * | 1985-11-01 | 1987-05-18 | Nippon Zeon Co Ltd | Magnetic powder for magnetic recording |
| CN1849675A (en) * | 2003-09-12 | 2006-10-18 | 株式会社新王磁材 | Ferrite sintered magnet |
| CN1873844A (en) * | 1997-12-25 | 2006-12-06 | 日立金属株式会社 | Method for producing ferrite magnet |
| CN102598169A (en) * | 2009-07-28 | 2012-07-18 | 三星电子株式会社 | Y-type hexagonal ferrite, fabrication method thereof, and antenna apparatus using the same |
-
2012
- 2012-11-19 CN CN2012104752484A patent/CN103011795A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62107437A (en) * | 1985-11-01 | 1987-05-18 | Nippon Zeon Co Ltd | Magnetic powder for magnetic recording |
| CN1873844A (en) * | 1997-12-25 | 2006-12-06 | 日立金属株式会社 | Method for producing ferrite magnet |
| CN1849675A (en) * | 2003-09-12 | 2006-10-18 | 株式会社新王磁材 | Ferrite sintered magnet |
| CN102598169A (en) * | 2009-07-28 | 2012-07-18 | 三星电子株式会社 | Y-type hexagonal ferrite, fabrication method thereof, and antenna apparatus using the same |
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Application publication date: 20130403 |