CN104882240A - Magnetic material for photovoltaic inverter and preparation method thereof - Google Patents
Magnetic material for photovoltaic inverter and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a magnetic material for a photovoltaic inverter. The magnetic material for the photovoltaic inverter is MnZn ferrite, and consists of a main constituent and an auxiliary constituent, wherein weight rate between the main constituent and the auxiliary constituent is 12:1, the main constituent contains following constituents of, by weight percentage, 8.80-9.30% of Mn, 7.12-9.27% of Zn, 2.10-4.30% of Si, 2.53-2.57% of Al, 0.51-1.35% of C, 0.45-0.62% of Cr, 0.18-1.32% of Ti, 0.18-1.25% of Y, 0.20-0.36% of V, 0.73-0.87% of Cu, 0.80-0.87% of Ni, and the balance Fe and impurities which can not be removed, the Fe exists mainly in an iron trioxide form, the Zn exists in a zinc oxide form, and the auxiliary constituent contains following constituents of, by weight percentage, 8-12% of Ce, 5-7% of Pr, 0-3% of Ho, 15-25% of Dy, 2-6% of Er, 0-4% of Eu, and the balance La. By adjusting the constituents and the technology and adding rare earth elements, the magnetic material for the photovoltaic inverter has good high frequency performance, a usual application range of the magnetic material for the photovoltaic inverter is larger than 1MHZ, magnetic conductivity usually changes below 1500, and the magnetic material for the photovoltaic inverter is suitable for manufacture of various magnetism reading materials, manufacture of middle axis transformer cores, manufacture of inductors, manufacture of filtering coils and the like, and is widely used in fields of information writing and reading, radio frequency communications, radio and television and the like.
Description
Technical field
The present invention relates to a kind of composite magnetic, specifically a kind of magnetic material for photovoltaic inverter and preparation method thereof.
Background technology
The electric power that photovoltaic battery panel transforms is direct current, and really will become the spendable alternating current of most occasion and just can't do without special equipment a--inverter, the function of inverter is that direct current is converted to alternating current, and photovoltaic DC-to-AC converter is photovoltaic system core devices; The improvement of inverter performance for the reliability, the efficiency that improve system, improve system lifetim, reduce costs most important.
Due to the particularity of photovoltaic generating system, in inverter operating circuit, DC stacked composition is more, and operating fields intensity is comparatively large simultaneously, and therefore also the MnZn ferrite material of non-generic can meet the demands.The MnZn ferrite material worked in photovoltaic DC-to-AC converter must have good electromagnetic performance, i.e. high-frequency and low-consumption, and its DC superposition characteristic is excellent simultaneously.
Summary of the invention
Technical problem to be solved by this invention is, for the shortcoming of above prior art, propose a kind of magnetic material for photovoltaic inverter and preparation method thereof, possess good high frequency characteristics, there is the feature of low thermal coefficient of expansion and low magnetostriction coefficient, high-frequency and low-consumption, high saturation magnetic flux density.
In order to solve the problems of the technologies described above, technical scheme of the present invention is achieved in the following ways: provide a kind of magnetic material for photovoltaic inverter, this magnetic material is a kind of MnZn ferrite, this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:8.80-9.30%, Zn:7.12-9.27%, Si:2.10-4.30%, Al:2.53-2.57%, C:0.51-1.35%, Cr:0.45-0.62%, Ti:0.18-0.32%, Y:0.18-0.25%, V:0.20-0.36%, Cu:0.73-0.87%, Ni:0.80-0.87%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, zinc exists with zinc oxide form,
Auxiliary element comprises following component by weight percentage: Ce:8-12%, Pr:5-7%, Ho:0-3%, Dy:15-25%, Er:2-6%, Eu:0-4%, and surplus is La;
Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.016-0.018%, S:0.012-0.014%.
The technical scheme that the present invention limits further is: aforesaid magnetic material for photovoltaic inverter, this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:8.80%, Zn:7.12%, Si:2.10%, Al:2.537%, C:0.51%, Cr:0.45%, Ti:0.18%, Y:0.18%, V:0.20%, Cu:0.73%, Ni:0.80%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, zinc exists with zinc oxide form,
Auxiliary element comprises following component by weight percentage: Ce:8%, Pr:5%, Dy:15%, Er:2%, Eu:1%, and surplus is La; Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.016%, S:0.012%.
Aforesaid magnetic material for photovoltaic inverter, this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:9.10%, Zn:8.17%, Si:3.40%, Al:2.55%, C:0.87%, Cr:0.52%, Ti:0.22%, Y:0.20%, V:0.26%, Cu:0.77%, Ni:0.84%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, and zinc exists with zinc oxide form;
Auxiliary element comprises following component by weight percentage: Ce:10%, Pr:6%, Ho:2%, Dy:19%, Er:4%, Eu:1%, and surplus is La;
Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.017%, S:0.013%.
Aforesaid magnetic material for photovoltaic inverter, this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:9.30%, Zn:9.27%, Si:4.30%, Al:2.57%, C:1.35%, Cr:0.62%, Ti:0.32%, Y:0.25%, V:0.36%, Cu:0.87%, Ni:0.87%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, and zinc exists with zinc oxide form;
Auxiliary element comprises following component by weight percentage: Ce:12%, Pr:7%, Dy:25%, Er:6%, Eu:4%, and surplus is La;
Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.018%, S:0.014%.
A preparation method for magnetic material for photovoltaic inverter, comprises the following steps:
(1) according to the proportioning of aforementioned component, take through the properly mixed slaine component that draws of converting, by the dissolving metal salts that takes in the distilled water of 100ml, be stirred to and dissolve completely; In metal salt solution, add the acetylacetone,2,4-pentanedione solution that concentration is 35-40mol/L again, stirred at ambient temperature 20-30min, generate dark brown suspension-turbid liquid;
(2) dose volume ratio is acetone and the water mixed solution of 8: 3, and the suspension-turbid liquid that step (1) obtains is added to above-mentioned acetone and water mixed solution, keeps the temperature of 50-65 DEG C, is stirred to and dissolves completely, and room temperature cools;
(3) ratio being 2:1 according to complexing agent and metal ion mol ratio takes appropriate oxalic acid and is dissolved in the distilled water of 50ml, and stirring makes it dissolve completely;
(4) enveloping agent solution that step (3) obtains is joined slowly in the solution of slaine of step (2), and ceaselessly stir in adition process, maintain the temperature at 25-30 DEG C, make it fully complexing occur, stir, after 1 hour, appropriate glucose is added above-mentioned solution;
(5) in above-mentioned solution, instilling ammoniacal liquor for regulating its pH value, the pH value of mixed solution being adjusted to 5.8-6.2, mixed solution is added thermal agitation, heating-up temperature 70 DEG C, stir 7-8 hour, can gel be obtained,
(6) gel to be placed in drying box dry 24 hours, baking temperature 105-120 DEG C, in dry run, colloid can expand rapidly, the xerogel that after drying completes, acquisition is fluffy; The method of ball milling is adopted to be mixed with above-mentioned fluffy xerogel by the solution containing oligoacrylonitrile, in mass ratio, oligoacrylonitrile: fluffy xerogel=0.2-0.5:3, evaporating solvent, drying at room temperature;
(7) at 230-250 DEG C of isothermal curing 3-5h; then grind; heat-treat passing in the Muffle furnace under argon shield; 750-900 DEG C of calcination 4-6h; insulation 2h; rate of temperature fall is 3-5 DEG C/min, forms carbon coating layer through calcining at ferric oxide powder particle surface, obtained magnetic material carbon composite powder.
The invention has the beneficial effects as follows: by the adjustment to component and technique of the present invention, after adding rare earth element, magnetic material of the present invention is made to have good high frequency characteristics, the common scope of application is at more than 1MHz, magnetic permeability generally changes below 1500, be applicable to the manufacture of various magnetic reading material, the manufacture of axis magnetic core of transformer, the manufacture of inductor, the manufacture etc. of filter coil, make it have application widely in fields such as information write reading, radio-frequency communication, radio and television.Selected by the present invention, rare earth element is representative in atomic magnetic moment, and each rare earth element is all adopted to the doping of different content, showing by detecting, the ferritic magnetic property of MnZn can be regulated on certain Chengdu by rear-earth-doped, expand the ferritic range of application of MnZn.
Embodiment
The present invention is described in further detail below:
embodiment 1
A kind of magnetic material for photovoltaic inverter that the present embodiment provides, this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:8.80%, Zn:7.12%, Si:2.10%, Al:2.537%, C:0.51%, Cr:0.45%, Ti:0.18%, Y:0.18%, V:0.20%, Cu:0.73%, Ni:0.80%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, and zinc exists with zinc oxide form;
Auxiliary element comprises following component by weight percentage: Ce:8%, Pr:5%, Dy:15%, Er:2%, Eu:1%, and surplus is La; Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.016%, S:0.012%.
The manufacturing process of the present embodiment comprises the following steps:
(1) according to the proportioning of aforementioned component, take through the properly mixed slaine component that draws of converting, by the dissolving metal salts that takes in the distilled water of 100ml, be stirred to and dissolve completely; In metal salt solution, add the acetylacetone,2,4-pentanedione solution that concentration is 35mol/L again, stirred at ambient temperature 20min, generate dark brown suspension-turbid liquid;
(2) dose volume ratio is acetone and the water mixed solution of 8: 3, and the suspension-turbid liquid that step (1) obtains is added to above-mentioned acetone and water mixed solution, keeps the temperature of 50 DEG C, is stirred to and dissolves completely, and room temperature cools;
(3) ratio being 2:1 according to complexing agent and metal ion mol ratio takes appropriate oxalic acid and is dissolved in the distilled water of 50ml, and stirring makes it dissolve completely;
(4) enveloping agent solution that step (3) obtains is joined slowly in the solution of slaine of step (2), and ceaselessly stir in adition process, maintain the temperature at 25 DEG C, make it fully complexing occur, stir, after 1 hour, appropriate glucose is added above-mentioned solution;
(5) in above-mentioned solution, instilling ammoniacal liquor for regulating its pH value, the pH value of mixed solution being adjusted to 5.8, mixed solution is added thermal agitation, heating-up temperature 70 DEG C, stir 7-8 hour, can gel be obtained,
(6) gel to be placed in drying box dry 24 hours, baking temperature 105 DEG C, in dry run, colloid can expand rapidly, the xerogel that after drying completes, acquisition is fluffy; The method of ball milling is adopted to be mixed with above-mentioned fluffy xerogel by the solution containing oligoacrylonitrile, in mass ratio, oligoacrylonitrile: fluffy xerogel=0.25:3, evaporating solvent, drying at room temperature;
(7) at 250 DEG C of isothermal curing 3h, then grind, heat-treat passing in the Muffle furnace under argon shield; 750 DEG C of calcination 6h, insulation 2h, rate of temperature fall is 3 DEG C/min; carbon coating layer is formed at ferric oxide powder particle surface, obtained magnetic material carbon composite powder through calcining.
embodiment 2
A kind of magnetic material for photovoltaic inverter that the present embodiment provides, this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:9.10%, Zn:8.17%, Si:3.40%, Al:2.55%, C:0.87%, Cr:0.52%, Ti:0.22%, Y:0.20%, V:0.26%, Cu:0.77%, Ni:0.84%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, and zinc exists with zinc oxide form;
Auxiliary element comprises following component by weight percentage: Ce:10%, Pr:6%, Ho:2%, Dy:19%, Er:4%, Eu:1%, and surplus is La;
Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.017%, S:0.013%.
The manufacturing process of the present embodiment comprises the following steps:
(1) according to the proportioning of aforementioned component, take through the properly mixed slaine component that draws of converting, by the dissolving metal salts that takes in the distilled water of 100ml, be stirred to and dissolve completely; In metal salt solution, add the acetylacetone,2,4-pentanedione solution that concentration is 40mol/L again, stirred at ambient temperature 25min, generate dark brown suspension-turbid liquid;
(2) dose volume ratio is acetone and the water mixed solution of 8: 3, and the suspension-turbid liquid that step (1) obtains is added to above-mentioned acetone and water mixed solution, keeps the temperature of 55 DEG C, is stirred to and dissolves completely, and room temperature cools;
(3) ratio being 2:1 according to complexing agent and metal ion mol ratio takes appropriate oxalic acid and is dissolved in the distilled water of 50ml, and stirring makes it dissolve completely;
(4) enveloping agent solution that step (3) obtains is joined slowly in the solution of slaine of step (2), and ceaselessly stir in adition process, maintain the temperature at 28 DEG C, make it fully complexing occur, stir, after 1 hour, appropriate glucose is added above-mentioned solution;
(5) in above-mentioned solution, instilling ammoniacal liquor for regulating its pH value, the pH value of mixed solution being adjusted to 6.0, mixed solution is added thermal agitation, heating-up temperature 70 DEG C, stirring 7 hours, can gel be obtained,
(6) gel to be placed in drying box dry 24 hours, baking temperature 110 DEG C, in dry run, colloid can expand rapidly, the xerogel that after drying completes, acquisition is fluffy; The method of ball milling is adopted to be mixed with above-mentioned fluffy xerogel by the solution containing oligoacrylonitrile, in mass ratio, oligoacrylonitrile: fluffy xerogel=0.4:3, evaporating solvent, drying at room temperature;
(7) at 240 DEG C of isothermal curing 4h, then grind, heat-treat passing in the Muffle furnace under argon shield; 800 DEG C of calcination 5h, insulation 2h, rate of temperature fall is 4 DEG C/min; carbon coating layer is formed at ferric oxide powder particle surface, obtained magnetic material carbon composite powder through calcining.
embodiment 3
A kind of magnetic material for photovoltaic inverter that the present embodiment provides, this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:9.30%, Zn:9.27%, Si:4.30%, Al:2.57%, C:1.35%, Cr:0.62%, Ti:0.32%, Y:0.25%, V:0.36%, Cu:0.87%, Ni:0.87%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, and zinc exists with zinc oxide form;
Auxiliary element comprises following component by weight percentage: Ce:12%, Pr:7%, Dy:25%, Er:6%, Eu:4%, and surplus is La;
Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.018%, S:0.014%.
The manufacturing process of the present embodiment comprises the following steps:
(1) according to the proportioning of aforementioned component, take through the properly mixed slaine component that draws of converting, by the dissolving metal salts that takes in the distilled water of 100ml, be stirred to and dissolve completely; In metal salt solution, add the acetylacetone,2,4-pentanedione solution that concentration is 38mol/L again, stirred at ambient temperature 30min, generate dark brown suspension-turbid liquid;
(2) dose volume ratio is acetone and the water mixed solution of 8: 3, and the suspension-turbid liquid that step (1) obtains is added to above-mentioned acetone and water mixed solution, keeps the temperature of 65 DEG C, is stirred to and dissolves completely, and room temperature cools;
(3) ratio being 2:1 according to complexing agent and metal ion mol ratio takes appropriate oxalic acid and is dissolved in the distilled water of 50ml, and stirring makes it dissolve completely;
(4) enveloping agent solution that step (3) obtains is joined slowly in the solution of slaine of step (2), and ceaselessly stir in adition process, maintain the temperature at 30 DEG C, make it fully complexing occur, stir, after 1 hour, appropriate glucose is added above-mentioned solution;
(5) in above-mentioned solution, instilling ammoniacal liquor for regulating its pH value, the pH value of mixed solution being adjusted to 6.2, mixed solution is added thermal agitation, heating-up temperature 70 DEG C, stirring 8 hours, can gel be obtained,
(6) gel to be placed in drying box dry 24 hours, baking temperature 120 DEG C, in dry run, colloid can expand rapidly, the xerogel that after drying completes, acquisition is fluffy; The method of ball milling is adopted to be mixed with above-mentioned fluffy xerogel by the solution containing oligoacrylonitrile, in mass ratio, oligoacrylonitrile: fluffy xerogel=0.5:3, evaporating solvent, drying at room temperature;
(7) at 250 DEG C of isothermal curing 3h, then grind, heat-treat passing in the Muffle furnace under argon shield; 900 DEG C of calcination 4h, insulation 2h, rate of temperature fall is 5 DEG C/min; carbon coating layer is formed at ferric oxide powder particle surface, obtained magnetic material carbon composite powder through calcining.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (5)
1. a magnetic material for photovoltaic inverter, this magnetic material is a kind of MnZn ferrite, it is characterized in that: this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:8.80-9.30%, Zn:7.12-9.27%, Si:2.10-4.30%, Al:2.53-2.57%, C:0.51-1.35%, Cr:0.45-0.62%, Ti:0.18-0.32%, Y:0.18-0.25%, V:0.20-0.36%, Cu:0.73-0.87%, Ni:0.80-0.87%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, zinc exists with zinc oxide form,
Auxiliary element comprises following component by weight percentage: Ce:8-12%, Pr:5-7%, Ho:0-3%, Dy:15-25%, Er:2-6%, Eu:0-4%, and surplus is La;
Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.016-0.018%, S:0.012-0.014%.
2. magnetic material for photovoltaic inverter according to claim 1, it is characterized in that: this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:8.80%, Zn:7.12%, Si:2.10%, Al:2.537%, C:0.51%, Cr:0.45%, Ti:0.18%, Y:0.18%, V:0.20%, Cu:0.73%, Ni:0.80%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, zinc exists with zinc oxide form,
Auxiliary element comprises following component by weight percentage: Ce:8%, Pr:5%, Dy:15%, Er:2%, Eu:1%, and surplus is La; Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.016%, S:0.012%.
3. magnetic material for photovoltaic inverter according to claim 1, it is characterized in that: this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:9.10%, Zn:8.17%, Si:3.40%, Al:2.55%, C:0.87%, Cr:0.52%, Ti:0.22%, Y:0.20%, V:0.26%, Cu:0.77%, Ni:0.84%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, zinc exists with zinc oxide form,
Auxiliary element comprises following component by weight percentage: Ce:10%, Pr:6%, Ho:2%, Dy:19%, Er:4%, Eu:1%, and surplus is La;
Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.017%, S:0.013%.
4. magnetic material for photovoltaic inverter according to claim 1, it is characterized in that: this magnetic material comprises principal component and auxiliary element, principal component and auxiliary element are 12:1 by ratio of weight and the number of copies, wherein principal component comprises following component by weight percentage: Mn:9.30%, Zn:9.27%, Si:4.30%, Al:2.57%, C:1.35%, Cr:0.62%, Ti:0.32%, Y:0.25%, V:0.36%, Cu:0.87%, Ni:0.87%, surplus is iron and not eliminable impurity, wherein iron mainly exists with di-iron trioxide form, zinc exists with zinc oxide form,
Auxiliary element comprises following component by weight percentage: Ce:12%, Pr:7%, Dy:25%, Er:6%, Eu:4%, and surplus is La;
Impurity content wherein in principal component controls at N≤0.006%, H≤0.002%, P:0.018%, S:0.014%.
5. the preparation method of magnetic material for photovoltaic inverter according to claim 1, is characterized in that comprising the following steps:
(1) according to the proportioning of component described in claim 1, take through the properly mixed slaine component that draws of converting, by the dissolving metal salts that takes in the distilled water of 100ml, be stirred to and dissolve completely; In metal salt solution, add the acetylacetone,2,4-pentanedione solution that concentration is 35-40mol/L again, stirred at ambient temperature 20-30min, generate dark brown suspension-turbid liquid;
(2) dose volume ratio is acetone and the water mixed solution of 8: 3, and the suspension-turbid liquid that step (1) obtains is added to above-mentioned acetone and water mixed solution, keeps the temperature of 50-65 DEG C, is stirred to and dissolves completely, and room temperature cools;
(3) ratio being 2:1 according to complexing agent and metal ion mol ratio takes appropriate oxalic acid and is dissolved in the distilled water of 50ml, and stirring makes it dissolve completely;
(4) enveloping agent solution that step (3) obtains is joined slowly in the solution of slaine of step (2), and ceaselessly stir in adition process, maintain the temperature at 25-30 DEG C, make it fully complexing occur, stir, after 1 hour, appropriate glucose is added above-mentioned solution;
(5) in above-mentioned solution, instilling ammoniacal liquor for regulating its pH value, the pH value of mixed solution being adjusted to 5.8-6.2, mixed solution is added thermal agitation, heating-up temperature 70 DEG C, stir 7-8 hour, can gel be obtained,
(6) gel to be placed in drying box dry 24 hours, baking temperature 105-120 DEG C, in dry run, colloid can expand rapidly, the xerogel that after drying completes, acquisition is fluffy; The method of ball milling is adopted to be mixed with above-mentioned fluffy xerogel by the solution containing oligoacrylonitrile, in mass ratio, oligoacrylonitrile: fluffy xerogel=0.2-0.5:3, evaporating solvent, drying at room temperature;
(7) at 230-250 DEG C of isothermal curing 3-5h; then grind; heat-treat passing in the Muffle furnace under argon shield; 750-900 DEG C of calcination 4-6h; insulation 2h; rate of temperature fall is 3-5 DEG C/min, forms carbon coating layer through calcining at ferric oxide powder particle surface, obtained magnetic material carbon composite powder.
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| CN107162581A (en) * | 2017-06-08 | 2017-09-15 | 合肥华盖光伏科技有限公司 | A kind of photovoltaic DC-to-AC converter high-performance manganese-zinc magnetic material and preparation method thereof |
| CN108164261A (en) * | 2018-01-23 | 2018-06-15 | 合肥华盖光伏科技有限公司 | A kind of photovoltaic transformer magnetic material and preparation method thereof |
| CN111403138A (en) * | 2020-04-12 | 2020-07-10 | 和也健康科技有限公司 | Carbon composite nickel-zinc soft magnetic ferrite material and preparation method thereof |
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