CN102311261A - Ferrite material for low frequency electrodeless lamps - Google Patents
Ferrite material for low frequency electrodeless lamps Download PDFInfo
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Abstract
The invention discloses a ferrite material for low frequency electrodeless lamps and a preparation method thereof, and is characterized in that the ferrite material comprises main components and auxiliary components, wherein the main components are weighed based on oxides and contain: 55-59mol% of Fe2O3, 4-8mol% of ZnO and the balance being MnO; and the auxiliary components are weighed based on oxides and contain: 0.06-0.25wt% of CaO, 0.01-0.03wt% of SiO2, 0.01-0.15wt% of NaCl, 0.03-0.25wt% of CuO, and 0.01-0.15wt% of SrCO3. The properties of the ferrite material are characterized in that the initial magnetic permeability at 25DEG C is 2700+/-25%; the initial magnetic permeability at minus 50DEG C is greater than or equal to 1500; the curie temperature is greater than or equal to 290DEG C; under the conditions of 100KHz, 20mT and 100DEG C, the power consumption is less than 350mw/cm<3>; under the conditions of 200KHz, 100mT and 100DEG C, the power consumption is less than 180mw/cm<3>; and under the conditions of 300KHz, 100mT and 100DEG C, the power consumption is less than 290mw/cm<3>.
Description
Technical field
The present invention relates to a kind of ferrite, relate in particular to a kind of low frequency electrodeless lamp with Ferrite Material and preparation method thereof.
Background technology
Electrodeless lamp (claiming electromagnetic induction lamp again), use be that electromagnetic oscillation activates principle of luminosity.Electrodeless lamp is made up of frequency generator (low frequency or high frequency), coupling mechanism and bulb (or fluorescent tube) three parts; Its principle of work is: energy of electromagnetic field is coupled in the bulb with induction mode; Make the breakdown formation plasma body of gas in the bulb; When the plasma body excited atom is returned ground state, give off the 254nm ultraviolet ray, fluorescent material on the bulb walls is excited and sends visible light.Compare with traditional electric light source, electrodeless light fixture has a lot of significantly advantages: owing to adopt the work of electromagnetic induction coupled modes, cancelled traditional filament and electrode; The electrodeless lamp life-span reached more than 100,000 hours; Be 100 times of incandescent light, 12 times of electricity-saving lamp, 4 times of high-pressure mercury lamp; Luminous efficiency is high, and is more energy-conservation more than 70% than incandescent light, more energy-conservation more than 50% than high voltage mercury lamp, high-pressure mercury lamp, Metal-halogen lamp, has extremely low running cost and maintenance cost; Solid-state amalgam and crown glass are adopted in environmental protection, and the material of use can recycle more than 98%, meets world's environmental requirement especially; Electromagnetic compatibility and EMI meet the GB17743-1999 standard; No stroboscopic, light decay are little, and light is stable, are beneficial to and eliminate people's visual fatigue, and useful vision health is real " green illumination "; Employing mercury alloys technology, no filament pre-heating is in-50 ℃ of-+280 ℃ of scopes; The normal startup work and the time of restarting have been eliminated the drawback that filament starts fully all less than 0.5 second, promptly open promptly bright; Be fit to the illumination of various environment and place, switch reaches more than 30,000 times, safe trouble free; The adaptive temperature wide ranges, power factor is up to more than 95%, and energy conservation and consumption reduction effects is remarkable.Electrodeless lamp has become internationally recognized the 4th generation energy-conserving and environment-protective new light sources.
The core component of electrodeless lamp electromagnetic energy conversion adopts ferrite core, and is very high to the requirement of Ferrite Material electromagnetic performance, otherwise electrodeless lamp at all can't works better.Electrodeless lamp is usually by two kinds of working frequency range, and is a kind of at high frequency, a kind of at low frequency.The HF lamp without electrodes operating frequency is used the NiZn ferrite core usually about 2.65MHz, the common volume of HF lamp without electrodes is less, and luminous power is less.And low frequency electrodeless lamp is operated under the low and medium frequency state; General 200～300KHz scope; Usually use the MnZn ferrite core; The low frequency electrodeless lamp volume can be done greatlyyer, and luminous power is big (can reach thousands of watts)), be applicable to the large-scale light area that road, bridge, tunnel, market, square geometric ratio are broad.
Low frequency electrodeless lamp is high to MnZn Ferrite Material performance requriements, requires Ferrite Material still can start electromagnetic oscillation in extremely low temperature (below 50 ℃), promptly requires Ferrite Material having enough magnetic permeabilities below-50 ℃; Require ferrite can keep electromagnetic oscillation in quite high working temperature (more than 280 ℃) again, keep works better, this just requires ferrite must have very high Tc (more than 280 ℃); In order to reduce the temperature rise of ferrite core as far as possible, and improve ferrite core electromagnetic energy efficiency of conversion, require Ferrite Material in the range of frequency of 200～300KHz, to have lower power consumption.
Above-mentioned these require to be difficult to realize for traditional M nZn Ferrite Material; Existing MnZn Ferrite Material present situation is: present MnZn Ferrite Material operating frequency range; Mainly be divided into 2 types; The one, be operated in the low frequency power Ferrite Material about 100KHz, another is the high-frequency power ferrite material that is operated in about 500KHz.
In the present existing Ferrite Material; Operating frequency has the low frequency MnZn ferrite material of superperformance about 100KHz; Its performance is :-50 ℃ of initial permeability≤1100, and Tc has only about 230 ℃, although the low frequency power consumption is lower; Under 100KHz, 200mT, 100 ℃ of conditions, power consumption is at 300mw/cm
3About, but its high frequency power consumption is bigger, under 200KHz, 100mT, 100 ℃ of conditions, power consumption reaches 250mw/cm
3About, under 300KHz, 100mT, 100 ℃ of conditions, power consumption reaches 450mw/cm
3About, this Ferrite Material is because low temperature magnetic permeability and Tc are lower, and causing easily under the low temperature (below 50 ℃) can't starting of oscillation (lamp can't be lighted); High temperature (more than 230 ℃) is failure of oscillation (lamp extinguishes) easily, simultaneously, because the high frequency power consumption is bigger; Be easy to cause ferrite core under the medium-high frequency working order; Temperature rise is excessive, when the ferrite core temperature reaches 230 ℃ (these ferritic Tc) when above, and will failure of oscillation (lamp extinguishes).Therefore, this Ferrite Material can't be applied on the low frequency electrodeless lamp.
In the present existing Ferrite Material; Operating frequency has the high frequency MnZn ferrite material of superperformance about 500KHz; Its performance is :-50 ℃ of initial permeability≤900, Tc has only about 240 ℃, although the high frequency power consumption is lower; Under 500KHz, 50mT, 100 ℃ of conditions, power consumption is at 80mw/cm
3About, under 300KHz, 100mT, 100 ℃ of conditions, power consumption is 310mw/cm
3About; But its low frequency power consumption is bigger, and under 100KHz, 200mT, 100 ℃ of conditions, power consumption is up to 700mw/cm
3About, under 200KHz, 100mT, 100 ℃ of conditions, power consumption reaches 200mw/cm
3About.This Ferrite Material is because low temperature magnetic permeability and Tc are lower, and causing easily low temperature (50 ℃) under can't starting of oscillation (lamp can't be lighted), the easy failure of oscillation (lamp extinguishes) of high temperature (more than 240 ℃); Simultaneously; Because the low frequency power consumption is bigger, is easy to cause ferrite core under the low frequency operation state, temperature rise is excessive; When the ferrite core temperature reaches 240 ℃ (these ferritic Tc) when above, will failure of oscillation (lamp extinguishes).Therefore, this Ferrite Material also can't be applied on the low frequency electrodeless lamp.
Can find out that by above-mentioned traditional M nZn power ferrite material can't be applied on the low frequency electrodeless lamp.Must develop a kind of new Ferrite Material; This Ferrite Material lower temperature (below 50 ℃) have enough magnetic permeabilities, Tc must more than 280 ℃, simultaneously, this Ferrite Material must have lower power consumption in the range of frequency of 200～300KHz.
Summary of the invention
Based on above-mentioned present situation; The present invention seeks to: propose a kind of can the Ferrite Material of successful Application on low frequency electrodeless lamp and preparation method thereof; This material is 2700 ± 25% 25 ℃ of initial permeabilities ,-50 ℃ of initial permeability>=1500, and Tc>=290 ℃; Under 100KHz, 200mT, 100 ℃ of conditions, power consumption is less than 350mw/cm
3, under 200KHz, 100mT, 100 ℃ of conditions, power consumption is less than 180mw/cm
3, under 300KHz, 100mT, 100 ℃ of conditions, power consumption is less than 290mw/cm
3This Ferrite Material has good electromagnetic performance, can satisfy low frequency electrodeless lamp fully to the various performance demands of Ferrite Material.
Technical scheme of the present invention is: a kind of low frequency electrodeless lamp is used Ferrite Material, and this Ferrite Material comprises principal constituent and ancillary component, and principal constituent comprises and is scaled (mol ratio): Fe
2O
3: 55～59mol%, ZnO:4～8mol%, surplus is MnO; Ancillary component comprises CaO, SiO
2, NaCl, CuO and SrCO
3, said ancillary component is with respect to principal constituent total amount content (weight ratio): CaO:0.06～0.25wt%, SiO as follows
2: 0.01～0.03wt%, NaCl:0.01～0.15wt%, CuO:0.03～0.25wt%, SrCO
3: 0.01～0.15wt%.
Below, the qualification reason of the numerical range of principal constituent of the present invention and ancillary component is described.
Work as Fe
2O
3Composition less than 55mol%, or the composition of ZnO is during less than 4mol%, under low temperature-50 ℃, is difficult for obtaining higher initial permeability.Work as Fe
2O
3Composition greater than 59mol%, although can obtain higher initial permeability at low temperatures, power consumption obviously strengthens.In addition, when the composition of ZnO during greater than 8mol%, the ferrite Tc is difficult to improve.
As everyone knows, MnZn power ferrite material power consumption mainly is made up of magnetic hysteresis loss, eddy-current loss and residual loss, and these three kinds of losses are played the part of different roles in different range of frequency, and when operating frequency during less than 250KHz, magnetic hysteresis loss is occupied an leading position; When operating frequency during greater than 250KHz, eddy-current loss is occupied an leading position.Ferrite Material of the present invention is owing to be operated in 200～300KHz scope; Be in the critical localisation of above-mentioned 2 kinds of ferrite I working frequencies; Must select and confirm good Ferrite Material principal constituent and ancillary component content and accurately control ferritic microstructure, thereby make magnetic hysteresis loss, eddy-current loss and residual loss three sum obtain the ideal minimum value.The present invention tightly goes to launch around this thought, finds through lot of test, and power consumption and the ferrite microstructure of MnZn power ferrite material under different frequency, i.e. crystal grain issue and size and crystal boundary are formed has very big relation.The present invention is through adding proper C aO, SiO
2, NaCl, CuO, SrCO
3, and strict control sintering process, the present invention finds to work as the ferrite crystal grains size control in 6～9 mu m ranges, can make ferrite in 200～300KHz scope, obtains minimum power consumption.
The ferrite that the present invention relates to as ancillary component, has added the CaO of 0.06～0.25wt%, the SiO of 0.01～0.03wt%
2, mainly be in order to improve ferrite grain boundary resistance rate, thereby reduce ferritic eddy-current loss; Adding the NaCl of 0.01～0.15wt%, mainly is in order to adjust Fe in the ferrite
+ 2Content, thereby reach the position of control Ferrite Material-50 ℃ initial permeability and lowest power consumption point; The CuO that adds 0.03～0.25wt% mainly is in order to promote the growth of ferrite crystal grains, to make the ferrite crystal grains size control in reasonable range; Add 0.01～0.15wt%SrCO
3Mainly be in order to prevent ferrite crystal grains misgrowth, thereby effectively reduce the ferrite power consumption.
A kind of low frequency electrodeless lamp of the present invention is with the preparation method of Ferrite Material, and its characteristic may further comprise the steps: 1) with principal constituent Fe
2O
3, Mn
3O
4, ZnO adds and to grind in the sand mill be added with deionized water in advance or the ball mill and then through spray drying granulation, 800～850 ℃ of pre-burnings in rotary kiln or box-type furnace, obtain ferrite prefiring material; 2) ferrite prefiring material is added in the sand mill that is added with deionized water in advance or the ball mill with ancillary component grind, obtain ferrite slurry, add 10% PVA solution (concentration is 10%) subsequently and carry out spray drying granulation, obtain ferrite powder; 3) ferrite powder is obtained the ferrite blank that density is 3.0 ± 0.2g/cm3 through the press compacting, the ferrite blank can be a different shape.With blank at vacuum sintering furnace or bell jar stove or N
2In the protection pushed bat kiln, in oxygen partial pressure is 0.5～5% balanced atmosphere, 1200～1250 ℃ of sintering temperatures 4～7 hours.Through such method of manufacture, just can be easily, and make Ferrite Material of the present invention at low cost.
The invention has the beneficial effects as follows: obtained a kind of low frequency electrodeless lamp and used Ferrite Material.Utilize the ferrite characteristic of the inventive method preparation to be: this material is 2700 ± 25% 25 ℃ of initial permeabilities, in-50 ℃ initial permeabilities>=1500, and Tc>=290 ℃, under 100KHz, 200mT, 100 ℃ of conditions, power consumption is less than 350mw/cm
3, under 200KHz, 100mT, 100 ℃ of conditions, power consumption is less than 180mw/cm
3, under 300KHz, 100mT, 100 ℃ of conditions, power consumption is less than 290mw/cm
3
Embodiment
Below, based on embodiment explanation the present invention.
The starting material weighing: take by weighing starting material by the principal constituent prescription, starting material are Fe
2O
3, ZnO and Mn
3O
4The principal constituent prescription comprises and is scaled (mol ratio): Fe
2O
3: 55～59mol%, ZnO:4～8mol%, surplus is MnO;
2) sand milling: load weighted starting material are put into sand mill, carry out the wet type sand milling, slip water cut 30%～50%, 0.5～1.0 hour sand milling time;
3) spray drying granulation: in the starting material slip, add about 10%PVA solution (concentration is 10%), carry out spray drying granulation one time;
4) pre-burning: a spray drying granulation powder is carried out pre-burning through rotary kiln, and calcined temperature is 800～850 ℃;
5) ancillary component adds: add following ancillary component, ancillary component is with respect to principal constituent total amount content (weight percent): CaO:0.06～0.25wt%, SiO as follows
2: 0.01～0.03wt%, NaCl:0.01～0.15wt%, CuO:0.03～0.25wt%, SrCO
3: 0.01～0.15wt%.
6) secondary sand milling: ferrite prefiring material and above-mentioned ancillary component are put into sand mill, carry out the wet type sand milling, slip water cut 30%～50%, 2.0～3.0 hours sand milling time;
7) secondary spray drying granulation:
In ferrite slurry, add about 10%PVA solution (concentration is 10%), carry out the secondary spray drying granulation;
8) moulding: secondary spray drying granulation ferrite powder is pressed into the ferrite blank that density is 3.0 ± 0.2g/cm3;
9) sintering: blank in vacuum sintering furnace or bell jar stove or N2 protection pushed bat kiln, is controlled by following sintering temperature curve and atmosphere: from room temperature to 600 ℃, this is the binder removal stage; It is comparatively mild to heat up; It is abundant that this helps binder removal, 100～150 ℃/hr of temperature rise rate, air atmosphere; After binder removal finished, temperature rise rate was brought up to 200～300 ℃/hr, air atmosphere; 1200～1250 ℃ of sintering temperatures are incubated 4～7 hours, and the sintering equilibrium oxygen partial pres-sure is 0.5～5%; Insulation finishes to about 1100 ℃ temperature-fall period, and Control for Oxygen Content is 0.01～0.3%, 100～150 ℃/hr of rate of temperature fall; Since 1100 ℃, fast cooling arrives room temperature, 150～250 ℃/h of rate of temperature fall, and Control for Oxygen Content is below 0.01%.
Above-mentioned prescription and preparation method can make Ferrite Material reach performance perameter according to the invention fully.Below in conjunction with specific embodiment the present invention is further specified.
Embodiment 1: by principal constituent prescription: Fe
2O
3: 58mol%, ZnO:8mol%, MnO:34mol% takes by weighing Fe
2O
3, Mn
3O
4And ZnO.Drop in the sand mill be added with deionized water in advance and grind, 0.5 hour sand milling time, with slip behind a mist projection granulating, 850 ℃ of pre-burnings 2 hours.Pre-burning material input is added with the deionized water sand mill in advance and carries out the secondary sand milling subsequently, and said relatively principal constituent content in the sand grinding process adds CaO:0.18wt%, SiO2:0.025wt%, NaCl:0.055wt%, CuO:0.05wt%, SrCO
3: 0.035wt%.2.0 hours sand milling time, the median size of control sand milling is 1.0 ± 0.2 μ m.Carry out the secondary spraying at last and obtain MnZn ferrite particle material powder.Get the annulus that this particulate material moulding compacting φ 25mm * φ 15mm * 7.5mm, density are approximately 3.0 ± 0.2g/cm3.Sintering is controlled by following sintering temperature curve and atmosphere: from room temperature to 600 ℃, this is the binder removal stage, and it is comparatively mild to heat up, and it is abundant that this helps binder removal, 100～150 ℃/hr of temperature rise rate, air atmosphere; After binder removal finished, temperature rise rate was brought up to 150～300 ℃/hr, air atmosphere; 1230 ℃ of sintering temperatures are incubated 5 hours, and equilibrium oxygen partial pres-sure is 3%; Finish to about 1100 ℃ temperature-fall period from insulation, Control for Oxygen Content is 0.01～0.2%, 100～150 ℃/hr of rate of temperature fall; Since 1100 ℃, fast cooling arrives room temperature, 150～250 ℃/hr of rate of temperature fall, and Control for Oxygen Content is below 0.01%.The Ferrite Material performance performance that obtains is seen table 1.
Embodiment 2: by principal constituent prescription: Fe
2O
3: 55mol%, ZnO:5mol%, MnO:40mol% takes by weighing Fe
2O
3, Mn
3O
4And ZnO.Drop in the sand mill that is added with deionized water in advance and grind, 0.5 hour sand milling time, slip behind a mist projection granulating, is carried out pre-burning at 860 ℃ of following electricity consumption heating revolving kilns.Pre-burning material input is added with the deionized water sand mill in advance and carries out the secondary sand milling subsequently, and said relatively principal constituent content in the sand grinding process adds CaO:0.12wt%, SiO
2: 0.01wt%, NaCl:0.025wt%, CuO:0.15wt%, SrCO
3: 0.05wt%.1.5 hours sand milling time, the median size of control sand milling is 1.0 ± 0.2 μ m.Carry out the secondary spraying at last and obtain MnZn ferrite particle material powder.Get the annulus that this particulate material moulding compacting φ 25mm * φ 15mm * 7.5mm, density are approximately 3.0 ± 0.2g/cm3, sintering method and embodiment 1 are identical.The Ferrite Material performance that obtains sees Table 1.
Table 1
| Electromagnetic performance | Test condition | Embodiment 1 | Embodiment 2 |
| 25 ℃ of initial permeabilities | Frequency: 10KHz | 2610 | 2880 |
| -50 ℃ of initial permeabilities | Frequency: 10KHz | 1850 | 1630 |
| Tc (℃) | Frequency: 10KHz | 310 | 298 |
| Power consumption (mw/cm 3) | 100KHz、200mT、100℃ | 343 | 328 |
| Power consumption (mw/cm 3) | 200KHz、100mT、100℃ | 176 | 162 |
| Power consumption (mw/cm 3) | 300KHz、200mT、100℃ | 283 | 272 |
Claims (1)
1. a low frequency electrodeless lamp is used Ferrite Material, it is characterized in that: this Ferrite Material comprises principal constituent and ancillary component, and principal constituent content is calculated as with oxide compound: Fe
2O
3: 55～59mol%, ZnO:4～8mol%, surplus is MnO; Ancillary component content is calculated as with oxide compound: CaO:0.06～0.25wt%, SiO
2: 0.01～0.03wt%, NaCl:0.01～0.15wt%, CuO:0.03～0.25wt%, SrCO
3: 0.01～0.15wt%;
This Ferrite Material performance characteristic is: 25 ℃ of initial permeabilities is 2700 ± 25%, in-50 ℃ initial permeabilities>=1500, and Tc>=290 ℃, under 100KHz, 200mT, 100 ℃ of conditions, power consumption is less than 350mw/cm
3, under 200KHz, 100mT, 100 ℃ of conditions, power consumption is less than 180mw/cm
3, under 300KHz, 100mT, 100 ℃ of conditions, power consumption is less than 290mw/cm
3
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| CN106699160A (en) * | 2016-12-25 | 2017-05-24 | 常州创索新材料科技有限公司 | Preparation method of manganese-zinc soft magnetic ferrite material |
| CN109694243A (en) * | 2018-12-04 | 2019-04-30 | 天长市昭田磁电科技有限公司 | A kind of soft magnetic ferrite and its preparation process using nano particle preparation |
| CN113956031A (en) * | 2021-11-25 | 2022-01-21 | 横店集团东磁股份有限公司 | Low-loss MnZn power ferrite and preparation method thereof |
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| CN109694243A (en) * | 2018-12-04 | 2019-04-30 | 天长市昭田磁电科技有限公司 | A kind of soft magnetic ferrite and its preparation process using nano particle preparation |
| CN113956031A (en) * | 2021-11-25 | 2022-01-21 | 横店集团东磁股份有限公司 | Low-loss MnZn power ferrite and preparation method thereof |
| CN113956031B (en) * | 2021-11-25 | 2023-02-21 | 横店集团东磁股份有限公司 | Low-loss MnZn power ferrite and preparation method thereof |
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