CN100348545C - Process for microwave sintering gyromagnet ferrite material - Google Patents
Process for microwave sintering gyromagnet ferrite material Download PDFInfo
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- CN100348545C CN100348545C CNB2005100324393A CN200510032439A CN100348545C CN 100348545 C CN100348545 C CN 100348545C CN B2005100324393 A CNB2005100324393 A CN B2005100324393A CN 200510032439 A CN200510032439 A CN 200510032439A CN 100348545 C CN100348545 C CN 100348545C
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Abstract
The invention relates to a method of a microwave sintering rotating magnetic ferrites material, which comprises the following steps: a rotating magnetic ferrites blank is put into a microwave furnace to sinter by microwave energy under the conditions of 300MHz to 300GHz microwave frequency and plenty oxygen, the temperature gradually rises to 2000 DEG C from the room temperature, and the temperature is held for 0 to 200 minutes; then the temperature is controlled to lower or lowers with furnace cooling to obtain the microwave sintering gyromagnet ferrite material. The present invention has the characteristics of simple manufacturing process, short producing cycle, high temperature rising speed, little heating time, high efficiency and energy saving. The sintered material has the advantages of good performance and great economic benefit.
Description
Technical field
The present invention relates to a kind of producing apparatus and method of magneticsubstance, specifically, relate to a kind of equipment and sintering method thereof that utilizes micro-wave energy to come sintering gyromagnetic ferrite material.
Background technology
Gyromagnetic ferrite claims microwave ferrite again, and Microwave Iron Oxide Elements are indispensable integral parts in electronicss such as modern communications, radar, electronic countermeasure and surveying instrument, play the irreplaceable effect of other components and parts.The gyromagnetic ferrite material mainly comprises carbuncle type, spinel type and hexaplanar (Magnetoplumbate-type) polycrystalline and monocrystalline ferrite material.Microwave Iron Oxide Elements to the major requirement of material are: ferromagnetic resonance line width Δ H is little, have required saturation magnetization Ms, microwave dielectric loss tg δ
eLittle, Curie temperature is high, the temperature factor of Ms is low, superpower critical magnetic field hc height promptly spins, and Hk is high for the live width Δ.Improving ferritic density is one of effective measure that reduce Δ H, and grain refining is the main path that improves Δ Hk, and sintering can effectively reduce microwave dielectric loss tg δ in oxygen rich air atmosphere.And the sintering method of at present domestic and international gyromagnetic material is mainly conventional heat-agglomerating method, is subjected to the influence of heating installation, be difficult for realizing rich, high temperature oxygen atmosphere sintering, and the sintering period is long, and material internal crystal grain is easily grown up unusually.
Summary of the invention
The technical problem to be solved in the present invention is, deficiency at existing traditional heating technology exists provides a kind of quick, efficient, energy-conservation, is easy to realize oxygen enrichment or pure oxygen sintering, be easy to obtain high-quality and burn till material, be easy to simultaneously to realize the method for the microwave sintering gyromagnetic ferrite material of scale production again.
Technical solution of the present invention is, the method of described microwave sintering gyromagnetic ferrite material is: utilize micro-wave energy to carry out sintering among the gyromagnetic ferrite blank is placed microwave sintering apparatus, described microwave sintering apparatus is a kind of in net belt type microwave oven/kiln, push-plate type microwave oven/kiln, roller bed type microwave oven/kiln, shuttle-type microwave oven/kiln, box microwave oven/kiln and the bell-jar microwave oven/kiln.Microwave frequency is in the 300MHz-300GHz scope, and atmosphere is oxygen-enriched atmosphere, also can be pure oxygen atmosphere or air.Described oxygen-enriched atmosphere is an oxygen content greater than 21% gas.Temperature is controlled by the adjusting of microwave power size, and be warmed up to gradually by room temperature and be up to 2000 ℃, soaking time 0～200 minute, preferred soaking time is 20～60 minutes.Controlled chilling or furnace cooling then.
The invention has the beneficial effects as follows that the present invention utilizes the type of heating of microwave to come sintering gyromagnetic ferrite material.It is different from the type of heating of conduction, radiation or the convection current of traditional combustion gas or electric furnace, the latter is by the conduction of the thermal source of outside or be radiated on the object, be transmitted to interior of articles by body surface again, speed is slow and energy utilization efficiency is not high, object internal and external temperature lack of homogeneity easily causes material internal component segregation, grain growth and inhomogeneous.And the employing microwave heating, microwave device or equipment are converted into micro-wave energy with electric energy, microwave can directly penetrate object and material directly is coupled, and the electromagnetic field of HF oscillation makes the polar molecule phase mutual friction of material inside, micro-wave energy is converted into again the heat energy of object.With the whole heating of object, internal-external temperature difference is little, can be rapidly heated.Also be accompanied by " non-heat " effect in the microwave heating process, can reduce temperature of reaction, promote the densification of interior of articles crystal grain.In addition, microwave heating just in the conversion of material internal generate energy, is converted into heat energy with micro-wave energy, does not have the heating unit of resistance wire, globars, Si-Mo rod etc., easily realizes the requirement of multiple sintering atmosphere.Can obtain better sintering effect,, both make Fast Sintering also can not cause blank cracking, and the material that burns till has preferable performance, thereby make the blank sintering qualification rate improve because the sintered body internal stress is little.Technology of the present invention is simple, and is with short production cycle, and production efficiency and economic benefit are considerable.
Embodiment
Embodiment 1, gets prescription and is { Y
3-xGd
x[Fe
1.8In
0.2] (Fe
3-zAl
z) O
12Carbuncle type gyromagnetic ferrite material 500g place the bell-jar microwave oven.Microwave frequency is 2.45GHz, fills 95% oxygen atmosphere in the stove.Material agglomerating heat-up rate is 8 ℃ of per minutes, and holding temperature is 1500 ℃, is incubated 40 minutes, furnace cooling then, and the whole sintering period is no more than 7 hours, and energy consumption is no more than 15kW.h.Detected result shows that the material average grain size is lower than 4 μ m, and other performance perameter is as shown in table 1.
Table 1 dielectric loss characteristics table
Embodiment 2, get prescription and are LiFe
1/2 (1-x+y)Mg
xTiAl
zFe
(2-2y-z)O
4Gyromagnetic ferrite material 800g place the bell-jar microwave oven, microwave frequency 2.45GHz, 99.5% oxygen atmosphere, 10 ℃/minute of heat-up rates, 950 ℃ of temperature are incubated 40 minutes, control cooling cooling, cooling rate is 5 ℃/minute, sintering period≤6 hour, energy consumption≤11kW.h.Detected result shows, material average grain size＜3 μ m, and other performance perameter sees Table 2.
Table 2 dielectric loss characteristics table
Claims (2)
1, a kind of method of microwave sintering gyromagnetic ferrite material, this method is to utilize micro-wave energy to carry out sintering among the gyromagnetic ferrite blank is placed microwave sintering apparatus, microwave frequency is in the 300MHz-300GHz scope, oxygen level is 95%～99.5% in the atmosphere, temperature is controlled by the adjusting of microwave power size, be warmed up to 2000 ℃ gradually by room temperature, soaking time 40 minutes, controlled chilling or furnace cooling then.
2, the method for microwave sintering gyromagnetic ferrite material according to claim 1, it is characterized in that described microwave sintering apparatus is a kind of in net belt type microwave oven/kiln, push-plate type microwave oven/kiln, roller bed type microwave oven/kiln, shuttle-type microwave oven/kiln, box microwave oven/kiln and the bell-jar microwave oven/kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100324393A CN100348545C (en) | 2005-11-25 | 2005-11-25 | Process for microwave sintering gyromagnet ferrite material |
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| CNB2005100324393A CN100348545C (en) | 2005-11-25 | 2005-11-25 | Process for microwave sintering gyromagnet ferrite material |
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|---|---|
| CN1793050A CN1793050A (en) | 2006-06-28 |
| CN100348545C true CN100348545C (en) | 2007-11-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101870579A (en) * | 2010-06-10 | 2010-10-27 | 上海应用技术学院 | Permanently magnetic strontium ferrite material and preparation method thereof |
| CN103745797B (en) * | 2014-01-09 | 2016-02-24 | 浙江和也健康科技有限公司 | A kind of anisotropic flexible magnetic stripe being applicable to magnetic health |
| CN112679204B (en) * | 2020-12-28 | 2022-04-08 | 横店集团东磁股份有限公司 | High-saturation high-dielectric-constant low-linewidth microwave ferrite material and preparation method thereof |
Citations (6)
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|---|---|---|---|---|
| US4374367A (en) * | 1979-12-28 | 1983-02-15 | Thomson-Csf | Non-reciprocal microwave-frequency device for high-level operation |
| US5384556A (en) * | 1993-09-30 | 1995-01-24 | Raytheon Company | Microwave circulator apparatus and method |
| CN1378996A (en) * | 2002-05-17 | 2002-11-13 | 中国科学院上海硅酸盐研究所 | Process for synthesizing nano barium ferrite powder by microwave induction and low-temp combustion |
| CN1402696A (en) * | 1999-11-30 | 2003-03-12 | 尤吉马格股份有限公司 | Method for making ferrite magnets |
| CN1450022A (en) * | 2003-04-30 | 2003-10-22 | 武汉众兴磁业技术开发有限公司 | Productive method of sintering anisotropic permanent magnetic ferrite |
| CN1587192A (en) * | 2004-08-05 | 2005-03-02 | 秦会斌 | Anti-interference magnesium-zinc ferrite and producing method |
-
2005
- 2005-11-25 CN CNB2005100324393A patent/CN100348545C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4374367A (en) * | 1979-12-28 | 1983-02-15 | Thomson-Csf | Non-reciprocal microwave-frequency device for high-level operation |
| US5384556A (en) * | 1993-09-30 | 1995-01-24 | Raytheon Company | Microwave circulator apparatus and method |
| CN1402696A (en) * | 1999-11-30 | 2003-03-12 | 尤吉马格股份有限公司 | Method for making ferrite magnets |
| CN1378996A (en) * | 2002-05-17 | 2002-11-13 | 中国科学院上海硅酸盐研究所 | Process for synthesizing nano barium ferrite powder by microwave induction and low-temp combustion |
| CN1450022A (en) * | 2003-04-30 | 2003-10-22 | 武汉众兴磁业技术开发有限公司 | Productive method of sintering anisotropic permanent magnetic ferrite |
| CN1587192A (en) * | 2004-08-05 | 2005-03-02 | 秦会斌 | Anti-interference magnesium-zinc ferrite and producing method |
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Address after: Hunan city Changsha Zhanggongling Longping high tech Park Changxing Road No. 178 Patentee after: Changsha Longtai Science & Technology Co., Ltd. Address before: M6 group 1, hi tech Industrial Development Zone, Hunan, Changsha Patentee before: Changsha Longtai Science & Technology Co., Ltd. |
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