CN114649124A - Magnetic conductive material, preparation method thereof and cooking utensil comprising magnetic conductive material - Google Patents
Magnetic conductive material, preparation method thereof and cooking utensil comprising magnetic conductive material Download PDFInfo
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- CN114649124A CN114649124A CN202011519194.8A CN202011519194A CN114649124A CN 114649124 A CN114649124 A CN 114649124A CN 202011519194 A CN202011519194 A CN 202011519194A CN 114649124 A CN114649124 A CN 114649124A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/083—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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Abstract
The invention relates to the technical field of cooking appliances, in particular to a magnetic conductive material, a preparation method thereof and a cooking appliance containing the magnetic conductive material. The magnetic conductive material comprises high-entropy alloy and filler; the high-entropy alloy comprises at least four of Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, Pb, Si and B, and at least comprises one or more of Fe, Co and Ni; the filler includes at least one of an inorganic porous material and a ceramic material. The utility model provides a cooking utensil can realize electromagnetic induction heating, improve heating efficiency, and has the characteristics that generate heat evenly, anti-deformation, constant temperature, corrosion resistance are good in the use.
Description
Technical Field
The invention relates to the technical field of cooking appliances, in particular to a magnetic conductive material, a preparation method thereof and a cooking appliance containing the magnetic conductive material.
Background
At present, in the related art, a pot for an electromagnetic cooking appliance is generally provided with a whole magnetic conductive induction heating layer, also called a magnetic conductive layer, in the circumferential direction, so that an electromagnetic coil arranged in the electromagnetic cooking appliance (such as an electromagnetic oven) is utilized to have a heating effect on the magnetic conductive induction heating layer, thereby heating the electromagnetic cooking pot.
In the prior art, the magnetic conductive material for forming the magnetic conductive layer is generally stainless steel, and the pot body is heated by electromagnetic force in a mode of cold riveting a stainless steel composite bottom sheet at the bottom of the pot body. Or the magnetic conduction layer is formed by spraying iron and stainless steel on the bottom of the pot body, so that the pot body is heated by electromagnetic force. Or the purpose of electromagnetic heating is realized by compounding iron and stainless steel into a pot body.
However, the way of cold riveting the stainless steel composite bottom sheet at the bottom of the pot body has the defects of untight combination, easy falling off, easy deformation and indent of products, need of a flat bottom surface with a certain diameter of the pot, and the like. The mode of spraying iron and stainless steel at the bottom of the pot body is easy to rust and corrode, and a protective coating needs to be additionally arranged on the outer side of the pot body. The mode of compounding iron and stainless steel into a pot body has the problems of high cost, complex process and easy delamination at high temperature. In addition, the existing magnetic conductive pot tool has the problems of high electromagnetic noise and low heat transfer speed when being used on an induction cooker.
Therefore, it is desirable to provide a magnetic conductive material for an electromagnetic cooking appliance and a cooking appliance comprising the same, so as to at least partially solve the problems in the prior art.
Disclosure of Invention
The invention mainly aims to provide a magnetic material, a preparation method thereof and a cooking utensil comprising the magnetic material, which can realize electromagnetic induction heating and have the characteristics of uniform heating, constant temperature, reduced or avoided deformation and reduced or avoided noise in the using process.
In order to achieve the purpose, the invention adopts the technical scheme that:
according to a first aspect of the present invention, there is provided a magnetic conductive material comprising a high entropy alloy and a filler;
the high-entropy alloy comprises at least four of Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, Pb, Si and B, and at least comprises one or more of Fe, Co and Ni;
the filler includes at least one of an inorganic porous material and a ceramic material.
According to the magnetic conductive material provided by the invention, the high-entropy alloy and the filler are mixed to prepare the magnetic conductive material, so that the magnetic conductive material has good magnetic performance, can realize electromagnetic induction heating, improves the heating efficiency, can enhance the heat transfer performance, improves the heat transfer speed and enables the temperature in a pot to be uniform. In addition, the magnetic conductive material has the excellent performances of constant temperature, deformation resistance, noise reduction, corrosion resistance, wear resistance and the like.
The magnetic conductive material can enable the electromagnetic cooking utensil finally containing the magnetic conductive material to achieve the following effects through the addition of the high-entropy alloy: the heating is uniform, and the magnetic material has high thermal conductivity and faster heat conduction compared with the traditional iron and stainless steel in the prior art by adjusting the composition or proportion of alloy elements and adding high-heat-conductivity metal elements (such as Cu and Al), and the temperature difference of different areas of the magnetic material is smaller. Moreover, the high-entropy alloy has a low Curie temperature and a constant temperature effect. The high-entropy alloy material has high strength and strong plastic deformation resistance, and can recover to the original shape along with the reduction of temperature after being heated and deformed.
This magnetic material helps improving magnetic material's porosity through the addition of filler, can absorb partly electromagnetic noise, can change metal magnetic material's natural frequency through the addition of filler moreover, reduces or avoids taking place the chance of resonating with the pan, and then reduces electromagnetic noise's sound shellfish.
In an alternative embodiment, in the high-entropy alloy, the atomic percentage of one or more of Fe, Co and Ni is 35% to 85%, and the atomic percentages of the remaining constituent elements are each independently 5% to 35%.
In an alternative embodiment, the high entropy alloy comprises at least one of an AlCrFeCoNi system, AlCrFeTiNi system, AlCrFeCoNiCu system, alcrfelmni system, or FeNiAlCr system.
In an alternative embodiment, the inorganic porous material comprises at least one of diatomaceous earth, zeolite, or bentonite; and/or the presence of a gas in the atmosphere,
the ceramic material comprises at least one of titanium carbide, titanium nitride, titanium diboride, silicon carbide, tungsten carbide, silicon nitride, boron nitride, calcium oxide, zirconium oxide, aluminum oxide, chromium oxide, or titanium suboxide.
The inorganic porous material is made of natural inorganic porous materials such as diatomite, bentonite or zeolite, or the ceramic material is made of ceramic materials such as titanium carbide, titanium nitride, titanium diboride and the like, the raw materials are convenient to obtain, the manufacturing cost is reduced, and the inorganic porous material is easy to be mixed with high-entropy alloy to prepare the magnetic conducting material.
In an alternative embodiment, the content of the filler is 1% to 25% by mass of the magnetic conductive material. Within this range, the magnetic permeability effect of the finally produced magnetic permeable material is not affected, and the filler can sufficiently exert the effect of reducing electromagnetic noise. If the filler content is less than 1%, the effect of reducing noise is not significant, and if the filler content is more than 25%, the content of the high-entropy alloy is too low, which may affect the magnetic permeability effect.
In an optional embodiment, the magnetic conductive material has a particle size of 200 to 1500 meshes. The grain diameter of the magnetic conductive material in the range has better construction performance, and is beneficial to reducing the cost or improving the binding force between the magnetic conductive material and the base material, so that the magnetic conductive layer formed by the magnetic conductive material has good surface state.
According to a second aspect of the present invention, there is provided a method for preparing a magnetic conductive material, comprising the following steps:
mixing the high-entropy alloy and the filler, and granulating to obtain the magnetic material;
the high-entropy alloy comprises at least four of Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, Pb, Si and B, and at least comprises one or more of Fe, Co and Ni;
the filler includes at least one of an inorganic porous material and a ceramic material.
In the preparation method, the mixed powder comprising the high-entropy alloy and the filler is mixed, the magnetic conductive material obtained by a granulation mode has excellent magnetic conductivity, can realize electromagnetic induction heating, and has the advantages of uniform heating, constant temperature, capability of reducing or avoiding deformation and capability of reducing or avoiding electromagnetic noise in the use process.
In an alternative embodiment, the mixing and granulating of the high-entropy alloy and the filler specifically comprises:
mixing the high-entropy alloy and the filler and then carrying out ball milling to obtain a mixture;
uniformly mixing the mixture with a binder, a first solvent and an auxiliary agent to obtain slurry;
and carrying out spray drying on the slurry to obtain the magnetic conductive material.
In an alternative embodiment, the preparation method satisfies at least one of the following conditions a) to c):
a) the adhesive comprises an adhesive substance and a second solvent, wherein the adhesive substance comprises at least one of polyvinyl alcohol, polyvinylpyrrolidone or sodium carboxymethyl cellulose;
the auxiliary agent comprises at least one of a surfactant, a defoaming agent or a dispersing agent;
wherein the surfactant comprises at least one of fatty acid sulfoalkyl ester, fatty acid sulfoalkylamide, and the like; the dispersant comprises at least one of stearic acid monoglyceride, tristearin and the like; the defoaming agent comprises at least one of polydimethylsiloxane, trialkyl melamine, cyanuric chloride melamine, fatty amine and the like;
b) the volume ratio of the bonding substance to the second solvent is 1: 3-1: 20;
c) in the slurry, the mass content of the high-entropy alloy is 30-60%, the mass content of the binder is 1-10%, the mass content of the filler is 5-20%, the mass content of the auxiliary agent is 0.2-1%, and the mass content of the first solvent is 20-70%.
In an alternative embodiment, the operating conditions of the spray drying satisfy at least one of the following conditions d) to g):
d) the atomization pressure is 0.3MPa to 0.6 MPa;
e) the flow rate of the atomizing gas is 0.5m3/h～5m3/h；
f) The inlet temperature is 200-600 ℃;
g) the temperature of the air outlet is 50-200 ℃.
In an alternative embodiment, the preparation method satisfies at least one of the following conditions h) to j):
h) the grain diameter of the high-entropy alloy is 6.5-25 mu m;
i) the grain diameter of the filler is 6.5-25 mu m;
j) the grain diameter of the prepared magnetic conductive material is 200-1500 meshes.
According to a third aspect of the present invention, there is provided a cooking appliance comprising the aforementioned magnetically conductive material or the magnetically conductive material obtained according to the aforementioned preparation method.
The cooking utensil provided by the invention comprises the magnetic conductive material, so that the cooking utensil at least has all the characteristics and advantages of the magnetic conductive material, and the description is omitted.
Drawings
FIG. 1(a) is a schematic FCC solid solution phase lattice representation of a high entropy alloy provided by an exemplary embodiment of the present application;
FIG. 1(b) is a schematic representation of the BCC solid solution phase lattice of a high entropy alloy provided by an exemplary embodiment of the present application;
FIG. 1(c) is a schematic HCP solid solution phase lattice diagram of a high entropy alloy provided by an exemplary embodiment of the present application;
fig. 2 is a schematic structural diagram of a cooking appliance according to an exemplary embodiment of the present application.
Reference numerals:
10-cooking utensil.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the drawings and the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art without any creative effort based on the technical solutions and the given embodiments provided in the present application belong to the protection scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and these ranges or values should be understood to encompass values close to these ranges or values. For numerical ranges, one or more new numerical ranges may be obtained by combining the individual values, or by combining the individual values.
It should be noted that the term "and/or"/"used herein is only an association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. As used herein, a list of items linked by the term "at least one of," "at least one of," or other similar term can mean any combination of the listed items. For example, if item A, B is listed, the phrase "at least one of A, B" means only a; only B; or A and B.
In this context, "inner" and "outer" are understood to mean inner and outer relative to the contour of the respective component itself, without being stated to the contrary.
As mentioned in the background art, the existing magnetic conductive material has more or less defects, so that in order to overcome the defects of the prior art and meet the needs of the existing market, the technical scheme of the embodiment of the invention provides the magnetic conductive material which can realize electromagnetic induction heating and improve heating efficiency, has the effects of uniform heating, constant temperature, deformation resistance and noise reduction in the use process, has excellent performances of corrosion resistance, wear resistance and the like, can enhance heat transfer performance, improve heat transfer speed, ensure uniform temperature in a pot, and can relieve the problems of low heat transfer speed, high noise, easy deformation and the like in the prior art.
In some embodiments of the present application, as shown in fig. 1(a), 1(b), and 1(c), a magnetic conductive material is provided, which includes a high entropy alloy and a filler;
wherein the composition elements of the high-entropy alloy comprise at least four of Mg (magnesium), Al (aluminum), Ti (titanium), V (vanadium), Cr (chromium), Mn (manganese), Fe (iron), Co (cobalt), Ni (nickel), Cu (copper), Zn (zinc), Zr (zirconium), Nb (niobium), Mo (molybdenum), Sn (tin), Hf (hafnium), Ta (tantalum), W (tungsten), Pb (lead), Si (silicon) and B (boron), and the composition elements at least comprise one or more of Fe (iron), Co (cobalt) and Ni (nickel);
the filler includes at least one of an inorganic porous material and a ceramic material.
This magnetic material makes magnetic material through mixing high entropy alloy and filler, not only has good magnetic properties, can realize electromagnetic induction heating, improves heating efficiency, can strengthen heat transfer performance moreover, improves heat transfer speed for the temperature in the pan is even. In addition, the magnetic conductive material has the excellent performances of constant temperature, deformation resistance, noise reduction, corrosion resistance, wear resistance and the like.
Specifically, on the one hand, as shown in fig. 1(a), 1(b) and 1(c), the high-entropy alloy is a multi-principal-element alloy material including at least 4 or more different metal elements, and the atomic ratio of each element is generally close to 1: 1, and therefore also called multi-principal element alloys. The high-entropy alloy has at least the following characteristics: high entropy effect, can reduce Gibbs free energy of alloy, and improve strength and hardness of alloy. The effect of lattice distortion can increase the dislocation motion resistance, thereby obviously increasing the hardness and the strength of the alloy. The delayed diffusion effect, lattice distortion caused by the size difference of atoms of different elements in the high-entropy alloy, the interaction among different atoms seriously influence the diffusion rate of the atoms, and the phase separation balance can be achieved only by means of the synergistic diffusion of the elements during solidification. The limited diffusion rate inhibits nucleation and grain growth of new phases, and some high-entropy alloys have nanocrystalline precipitation, so that the larger the number of grains in a certain volume of crystals, the more grain boundaries, the finer the grains, and the more grains in different orientations, so that the resistance to plastic deformation is higher. The properties of the high-entropy alloy are not only simple superposition or average of the properties of all elements, but also the interaction of different elements, and finally the high-entropy alloy presents a composite effect. Therefore, by utilizing the thermodynamic high-entropy effect, the structural lattice distortion effect, the kinetic delayed diffusion effect and the performance cocktail effect of the high-entropy alloy, the magnetic conductive material has high strength and hardness, the performances of plastic deformation resistance and low Curie temperature resistance, and the magnetic conductive material has the performances of corrosion resistance, oxidation resistance, high heat conduction and high magnetic conduction. And the high-entropy alloy containing the four or more elements is more favorable for exerting the properties of high magnetic permeability, corrosion resistance, difficult deformation and the like of the magnetic material.
The magnetic conductive material comprises the high-entropy alloy, so that the electromagnetic cooking utensil finally comprising the magnetic conductive material can achieve the following effects: (1) the heating is uniform, and the magnetic conducting material has high thermal conductivity and faster heat conduction compared with the traditional iron and stainless steel in the prior art by adjusting the composition or proportion of alloy elements and adding high-heat-conductivity metal elements such as Cu and Al, and the temperature difference of different areas of the magnetic conducting material is smaller. (2) At constant temperature, ferromagnetic substances have strong magnetism after being magnetized, but the strong magnetism is related to temperature, and the ordered arrangement of magnetic domains can be influenced along with the temperature rise of the ferromagnetic substances and the thermal motion of metal dot matrixes. However, without reaching a certain temperature, the thermal motion is not sufficient to destroy the parallel alignment of the magnetic domains, at which point the average magnetic moment of any macroscopic region is still not zero, the substance is still magnetic, but the average magnetic moment decreases with increasing temperature. When the temperature reaches a certain value, due to the violent thermal motion of molecules, the magnetic domain is collapsed, the average magnetic moment is reduced to zero, the magnetism of the ferromagnetic substance is disappeared and converted into paramagnetic substance, a series of ferromagnetic properties (such as high magnetic conductivity, magnetostriction and the like) associated with the magnetic domain are completely disappeared, the hysteresis loop disappears and becomes a straight line, and the magnetic conductivity of the corresponding ferromagnetic substance is converted into the magnetic conductivity of the paramagnetic substance. The temperature corresponding to the disappearance of ferromagnetism is the curie temperature. The high-entropy alloy material BCC phase and FCC phase can obviously reduce the Curie temperature of the alloy, when the temperature reaches the Curie point, the material is changed from ferromagnetism to paramagnetism, heating is stopped on an induction cooker or the heating power is extremely low, the temperature cannot be continuously increased, when the temperature is reduced, heating is continuously performed, and finally the temperature of a pot reaches dynamic balance near the Curie point. (3) The high-entropy alloy material has high strength and strong plastic deformation resistance, and can be restored to the original shape along with the reduction of temperature after being heated and deformed; moreover, the high-entropy alloy material can enable deformation of each crystal grain to be uniform, and the deformation of each crystal grain is not too concentrated on a few crystal grains to be serious; by utilizing the characteristic of uniform heating of the high-entropy alloy material, the deformation problem caused by large thermal expansion of a part with high temperature and small thermal expansion of a part with low temperature can be avoided; by utilizing the constant temperature effect of the high-entropy alloy material, the temperature of the high-entropy alloy material cannot be too high when the high-entropy alloy material is used on an induction cooker, so that the deformation caused by too high thermal expansion due to too high temperature is avoided.
On the other hand, the magnetic conductive material also contains a filler, and the filler can be an inorganic porous material, or a ceramic material, or a mixture of the inorganic porous material and the ceramic material. The addition of the filler is favorable for improving the porosity of the magnetic conductive material, part of electromagnetic noise can be absorbed, the natural frequency of the metal magnetic conductive material can be changed by the addition of the filler, the chance of resonance with a cooker is reduced or avoided, and then the sound intensity of the electromagnetic noise is reduced.
The high-entropy alloy contained in the magnetic conductive material at least contains four or more elements, and the four or more elements need to contain at least one of Fe, Co and Ni. For example, the four or more elements included in the high-entropy alloy include Fe, Co, Ni, Fe and Co, Fe and Ni, Co and Ni, Fe, Co, Ni, and the like. At least one element of Fe, Co and Ni in the high-entropy alloy can play a role in magnetic conductivity, and after the high-entropy alloy is compounded with other elements to prepare the high-entropy alloy, the cocktail effect of the high-entropy alloy is utilized, so that the corrosion resistance, the wear resistance, the strength and the like of the magnetic conductive material can be improved.
In some embodiments, the high-entropy alloy and the filler can be combined by granulation to form the magnetic conductive material.
In some embodiments, in the high entropy alloy, the atomic percentage of one or more of Fe, Co and Ni is 35% to 85%, further preferably 40% to 80%, further preferably 50% to 70%. Typically, but not by way of limitation, the total atomic percent of at least one of Fe, Co, and Ni can be, for example, 35%, 38%, 40%, 42%, 45%, 48%, 50%, 52%, 55%, 58%, 60%, 62%, 65%, 68%, 70%, 75%, 80%, 85%, and any value in the range of any two of these points. For example, when Fe is included in the high-entropy alloy, the atomic percentage of Fe is 35% to 85%; or when the high-entropy alloy contains Ni, the atomic percent of the Ni is 35 to 85 percent; or when the high-entropy alloy contains Fe and Ni, the total atomic percentage of the Fe and the Ni is 35-85%. When any two or three of Fe, Co and Ni are contained in the high-entropy alloy, the specific atomic ratio of each element may be adjusted within the above range, as long as the total atomic percentage thereof is 35% to 85%, and the specific numerical values of each element are not limited in the embodiments of the present application.
The Fe, Co and Ni elements belong to ferromagnetic elements, so that the high-entropy alloy in the magnetic conductive material needs to contain at least one of the Fe, Co and Ni elements to realize magnetic conductivity; in addition, the conditions for forming the high-entropy alloy comprise that the types of the elements are not less than four, and the atomic ratio of each element is more than 5%. Therefore, the characteristics of the high-entropy alloy material and the characteristics of the magnetic conductivity material are comprehensively considered, and the atomic percentage of one or more of Fe, Co and Ni is required to be within the range of 35-85%, so that the normal magnetic conductivity can be ensured, and the requirement of the high-entropy alloy can also be met.
It is to be understood that the high-entropy alloy includes the other elements as described above in addition to at least one of Fe, Co and Ni, so that the resulting high-entropy alloy contains at least four elements, and the atomic percentages of the remaining constituent elements are each independently 5% to 35%, and may be, for example, 5%, 8%, 10%, 12%, 15%, 20%, 25%, 30%, 35%, or any value within a range defined by any two of these points.
Within the range, the multi-principal-element characteristics of the high-entropy alloy material are ensured, the high magnetic permeability of the magnetic conductive element is fully exerted, and the alloy performance of the high-entropy alloy is ensured.
Herein, unless otherwise specified, the content of each constituent element in the high-entropy alloy in terms of atomic fraction or atomic percentage may be expressed as, for example, 35% to 85%, or 35 at.% to 85 at.%, or 35 atomic% to 85 atomic%.
In some embodiments, the high entropy alloy may be an AlCrFeCoNi system, may be an AlCrFeTiNi system, may be an AlCrFeCoNiCu system, may be an alcrfelmni system, may be a feni system, and the like.
Further, the high entropy alloy may be AlCr5Fe3Co3Ni2.5、AlCrFe2CoNi3Cu、AlCr2FeMnNi2、Al2CrFe3TiNi, and the like.
It should be understood that in other embodiments, the high-entropy alloy may also be an alloy material containing at least four constituent elements as above and having different composition ratios, which are not listed here.
In order to enable the magnetic conductive material to achieve the effect of reducing or avoiding noise, the magnetic conductive material can be prepared by mixing a filler and a high-entropy alloy, wherein the filler can achieve the purpose of reducing electromagnetic noise, and the filler can be an inorganic porous material or a ceramic material or a mixture of the inorganic porous material and the ceramic material. In some embodiments, the inorganic porous material comprises at least one of diatomaceous earth, zeolite, or bentonite; specifically, the inorganic porous material may be diatomaceous earth, zeolite, bentonite, a mixture of diatomaceous earth and zeolite in any ratio, a mixture of bentonite and zeolite in any ratio, a mixture of diatomaceous earth, bentonite and zeolite in any ratio, or the like. Since the material characteristics of diatomaceous earth, bentonite, or zeolite are similar, when the inorganic porous material is a mixture of a plurality of diatomaceous earth, bentonite, or zeolite (including two or more kinds), each component may be mixed in an arbitrary ratio. For example, when the inorganic porous material is a mixture of diatomaceous earth and zeolite, the diatomaceous earth and zeolite can be mixed in any proportion without affecting the performance of the magnetic conductive material, and the specific proportion or content thereof is not particularly limited and can be adjusted by one skilled in the art according to actual conditions. Further, in other embodiments, the inorganic porous material is not limited to the above-listed materials, but inorganic porous materials having similar structures or properties may also be employed.
The inorganic porous material is prepared from natural inorganic porous materials such as diatomite, bentonite or zeolite, raw materials are convenient to obtain, the manufacturing cost is reduced, and the inorganic porous material is easy to be mixed with high-entropy alloy to prepare the magnetic conduction material.
In some embodiments, the ceramic material comprises at least one of titanium carbide, titanium nitride, titanium diboride, silicon carbide, tungsten carbide, silicon nitride, boron nitride, calcium oxide, zirconium oxide, aluminum oxide, chromium oxide, or titanium suboxide. Specifically, the ceramic material may be titanium carbide, titanium nitride, titanium diboride, silicon carbide, tungsten carbide, silicon nitride, boron nitride, calcium oxide, zirconium oxide, aluminum oxide, chromium oxide, titanium suboxide, titanium carbide and titanium nitride, titanium diboride, silicon carbide and tungsten carbide, silicon nitride, boron nitride and calcium oxide, zirconium oxide, aluminum oxide, chromium oxide and titanium suboxide, and the like. It should be understood that, as mentioned above, because the characteristics of the ceramic materials such as titanium carbide, titanium nitride, titanium diboride, etc. are similar, when the ceramic material is a mixture of several of the above materials (including two or more), the components may be mixed according to any proportion, and the specific proportion or content of the embodiments of the present application is not particularly limited, and can be adjusted by those skilled in the art according to the actual situation. Furthermore, in other embodiments, the ceramic material is not limited to the several materials listed above, but ceramic materials having similar structures or properties may also be employed.
The ceramic material is made of ceramic materials such as titanium carbide, titanium nitride and titanium diboride, raw materials are convenient to obtain, the manufacturing cost is reduced, and the material is easy to be mixed with high-entropy alloy to be made into a magnetic conducting material.
In the magnetic conductive material, the filler is added to increase the porosity of the magnetic conductive material and absorb a part of electromagnetic noise; the addition of the filler can also change the natural frequency of the metal magnetic conductive material, avoid the chance of resonance with the cookware and reduce the sound of electromagnetic noise. In some embodiments, the filler is present in an amount of 1% to 25% by mass of the magnetically permeable material. Further, the content of the organic compound may be from 1% to 20%, further from 2% to 15%. Typically, but not by way of limitation, the filler content can be, for example, 1%, 2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.5%, 4.8%, 5%, 5.5%, 6%, 6.2%, 6.8%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, and any value in the range of any two of these points. In the magnetic conductive material, the content of the filler needs to be in a proper range, particularly in the range, the magnetic conductive effect of the finally prepared magnetic conductive material is not influenced, and the filler can fully exert the effect of reducing electromagnetic noise. If the filler content is less than 1%, the effect of reducing noise is not significant, and if the filler content is more than 25%, the content of the high-entropy alloy is too low, which affects the magnetic permeability effect.
In some embodiments, the magnetic conductive material has a particle size of 200 to 1500 meshes, further 200 to 1200 meshes, further 300 to 1000 meshes. Typically, but not by way of limitation, the grain size of the magnetic conductive material may be, for example, 200 mesh, 300 mesh, 320 mesh, 400 mesh, 450 mesh, 500 mesh, 600 mesh, 700 mesh, 800 mesh, 900 mesh, 1000 mesh, 1100 mesh, 1200 mesh, 1300 mesh, 1500 mesh, or any value in the range formed by any two of these values. The grain diameter of the magnetic conductive material in the range has better construction performance, and is beneficial to reducing the cost or improving the binding force between the magnetic conductive material and the base material, so that the magnetic conductive layer formed by the magnetic conductive material has good surface state.
According to the present invention, in some embodiments, there is also provided a method for preparing a magnetic conductive material, including the steps of:
mixing the high-entropy alloy and the filler, and granulating to obtain the magnetic material;
the high-entropy alloy comprises at least four of Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, Pb, Si and B, and at least comprises one or more of Fe, Co and Ni;
the filler includes at least one of an inorganic porous material and a ceramic material.
In the preparation method, the mixed powder comprising the high-entropy alloy and the filler is mixed, the magnetic conductive material obtained by granulation has excellent magnetic conductivity, can realize electromagnetic induction heating, and has the advantages of uniform heating, constant temperature, reduced or avoided deformation and reduced or avoided electromagnetic noise in the use process.
The preparation process of the magnetic conductive material is simple, easy to control, high in feasibility, less in environmental pollution and suitable for industrial mass production.
As can be understood by those skilled in the art, the preparation method of the magnetic conductive material of the present invention is based on the same inventive concept as the aforementioned magnetic conductive material, and the descriptions of the components, types, etc. of the magnetic conductive material in the preparation method of the magnetic conductive material can refer to the explanations of the aforementioned magnetic conductive material, and are not repeated herein.
In some embodiments, the mixing and granulating the high-entropy alloy and the filler specifically include:
mixing the high-entropy alloy and the filler and then carrying out ball milling to obtain a mixture;
uniformly mixing the mixture with a binder, a first solvent and an auxiliary agent to obtain slurry;
and carrying out spray drying on the slurry to obtain the magnetic conductive material.
The auxiliary agent may include at least one of a surfactant, a defoaming agent, or a dispersant;
wherein the surfactant comprises at least one of fatty acid sulfoalkyl ester, fatty acid sulfoalkylamide, and the like; the dispersant comprises at least one of stearic acid monoglyceride, tristearin and the like; the defoaming agent comprises at least one of polydimethylsiloxane, trialkyl melamine, cyanuric chloride melamine, fatty amine and the like. The examples of the present application are not intended to limit the specific types of adjuvants.
In some embodiments, the preparation method satisfies at least one of the following conditions a) to c):
a) the adhesive comprises an adhesive substance and a second solvent, wherein the adhesive substance comprises at least one of polyvinyl alcohol, polyvinylpyrrolidone or sodium carboxymethyl cellulose;
b) the volume ratio of the bonding substance to the second solvent is 1: 3-1: 20;
c) in the slurry, the mass content of the high-entropy alloy is 30-60%, the mass content of the binder is 1-10%, the mass content of the filler is 5-20%, the mass content of the auxiliary agent is 0.2-1%, and the mass content of the first solvent is 20-70%.
In some embodiments, the operating conditions of the spray drying satisfy at least one of the following conditions d) to g):
d) the atomization pressure is 0.3MPa to 0.6 MPa;
e) the flow rate of the atomizing gas is 0.5m3/h～5m3/h；
f) The inlet temperature is 200-600 ℃;
g) the temperature of the air outlet is 50-200 ℃.
In some embodiments, the preparation method satisfies at least one of the following conditions h) to j):
h) the grain diameter of the high-entropy alloy is 6.5-25 mu m;
i) the grain diameter of the filler is 6.5-25 mu m;
j) the grain diameter of the prepared magnetic conductive material is 200-1500 meshes.
In some specific embodiments, the preparation of the magnetic conductive material specifically comprises the following steps:
(1) a mixture is prepared.
The high-entropy alloy and the filler such as inorganic porous materials and/or ceramic materials are fully mixed and then are subjected to ball milling to obtain a mixture.
The two materials are mixed in a ball milling mode, so that on one hand, the two materials of different types can be fully mixed, and on the other hand, the particle size of the high-entropy alloy powder can be reduced and homogenized.
When mixing, the mass ratio of the high-entropy alloy to the filler can be (30-60): (0.6-5.3).
Wherein the grain diameter of the high-entropy alloy is 6.5-25 μm (500-2000 meshes); the particle size of the filler is 6.5-25 μm. In the particle size range, on one hand, the surface structure of the magnetic conductive material can be completely reserved, the wear-resistant, corrosion-resistant and magnetic conductive effects of the magnetic conductive material are ensured, and on the other hand, the spray granulation effect can be ensured.
(2) And (4) preparing the binder.
The binder comprises a mixture of a binding substance and a second solvent. The adhesive substance may be polyvinyl alcohol, polyvinylpyrrolidone or sodium carboxymethylcellulose, and the second solvent may be ethanol, acetone or water.
When the binder is prepared, the organic binder can be placed into a beaker filled with a certain amount of solvent, the beaker is heated in a water bath furnace, a glass rod is used for stirring the binder until the liquid formed in the beaker becomes transparent, the binder is fully dissolved, impurities are removed, and the binder can be obtained after cooling for later use. Wherein the volume ratio of the binding substance such as polyvinyl alcohol, polyvinylpyrrolidone or sodium carboxymethylcellulose to the second solvent such as ethanol, acetone or water is 1: 3-1: 20.
(3) and preparing slurry.
And (2) adding the mixture obtained in the step (1) into a first solvent such as water, uniformly stirring, adding the binder and the auxiliary agent obtained in the step (2), and uniformly stirring for 30-50 min to obtain slurry.
In the obtained slurry, the mass content of the high-entropy alloy is 30-60%, preferably 40-50%; the mass content of the binder is 1-10%, preferably 3-8%; the mass content of the filler is 5-20%, preferably 8-15%; the mass content of the auxiliary agent is 0.2-1%, preferably 0.2-0.8%; the mass content of the first solvent is 20-70%, preferably 40-50%.
(4) And (6) granulating.
And (4) carrying out spray drying treatment on the slurry obtained in the step (3), and granulating to obtain the magnetic material.
Wherein the spray drying conditions comprise:
the atomization pressure is 0.3MPa to 0.6MPa, preferably 0.4MPa to 0.5 MPa; the flow rate of the atomizing gas is 0.5m3/h～5m3H, preferably 1m3/h～3m3H; the inlet temperature is 200-600 ℃, preferably 300-400 ℃; the temperature of the air outlet is 50-200 ℃, and preferably 80-160 ℃.
In some embodiments, the grain size of the prepared magnetic conductive material is 200-1500 meshes. The magnetic conductive material having a particle diameter within this range has good workability and contributes to cost reduction.
According to the present invention, in some embodiments, as shown in fig. 2, there is also provided a cooking appliance 10, including the aforementioned magnetic conductive material or the magnetic conductive material obtained according to the aforementioned preparation method.
The cooking appliance 10 may be an electromagnetic cooking appliance, such as an electric rice cooker, an electric pressure cooker, an induction cooker or other type of electromagnetic heating cooker.
For example, the cooking utensil 10 may include an electromagnetic cooking pot and a heating device such as an electromagnetic oven, and a magnetic conduction layer formed by the above magnetic conduction material may be disposed on at least a portion of the bottom of the electromagnetic cooking pot, and the alternating magnetic field generates an alternating induction eddy current on the magnetic conduction layer by interaction of the magnetic conduction layer and an alternating magnetic field generated in the electromagnetic oven, so as to heat the bottom of the pot and the food in the containing cavity.
It should be understood that the present application provides a cooking appliance comprising a magnetically conductive material as described above, having all the features and advantages of the magnetically conductive material described above, which will not be described herein again.
In order to facilitate understanding of the present invention, the present invention will be further described below with reference to specific examples, comparative examples and test examples. In the following specific examples and comparative examples, materials used are commercially available unless otherwise specified.
Example 1
A magnetic conductive material comprises high-entropy alloy and diatomite, wherein the high-entropy alloy is AlCr2Fe3Co3Ni2The content of the diatomite is 5% of the mass of the magnetic conductive material.
The grain diameter of the magnetic conductive material is 200-300 meshes.
Examples 2 to 5
Examples 2-5 differ from example 1 mainly in the type of high entropy alloy.
In example 2, the high entropy alloy is AlCrFe2CoNi3Cu；
In example 3, the high entropy alloy is AlCr2FeMnNi2；
In example 4, the high entropy alloy was Al2CrFe3TiNi；
In example 5, the high-entropy alloy was MgZrFe2CuCo2；
The rest is the same as in example 1.
Examples 6 to 10
Examples 6 to 10 differ from example 1 mainly in the type of filler.
In example 6, the filler was zeolite foam;
in example 7, the filler was bentonite;
in example 8, the filler was a mixture of diatomaceous earth and zeolite;
in example 9, the filler was titanium carbide;
in example 10, the filler was a mixture of silicon carbide and boron nitride;
the rest of the process was the same as in example 1.
Examples 11 to 13
Examples 11 to 13 differ from example 1 mainly in the filler content.
In example 11, the content of diatomaceous earth was 1% by mass of the magnetic conductive material;
in example 12, the content of diatomaceous earth was 15% by mass of the magnetic conductive material;
in example 13, the content of diatomaceous earth was 25% by mass of the magnetic conductive material;
the rest is the same as in example 1.
Examples 14 to 15
Examples 14 to 15 are different from example 1 mainly in the particle size of the magnetic conductive material.
In example 14, the grain size of the magnetic conductive material was 800 mesh to 1000 mesh;
in example 15, the magnetic conductive material had a particle size of 1200 to 1500 meshes.
The rest is the same as in example 1.
Example 16
The preparation method of the magnetic material comprises the high-entropy alloy and the diatomite, wherein the high-entropy alloy is AlCr2Fe3Co3Ni2(ii) a The preparation method comprises the following steps:
(1) preparing a mixture, fully mixing the high-entropy alloy and a filler such as diatomite, and then carrying out ball milling to obtain the mixture.
Wherein the grain diameter of the high-entropy alloy is 10 mu m; the particle size of the filler was 10 μm.
(2) Preparing a binder, wherein the binder comprises a mixture of a binding substance polyvinyl alcohol and a second solvent ethanol. When the binder is prepared, the organic binder can be placed into a beaker filled with a certain amount of solvent, the organic binder is heated in a water bath furnace, a glass rod is used for stirring the binder until the liquid formed in the beaker becomes transparent, the binder is fully dissolved, impurities are removed, and the binder can be obtained after cooling for later use. Wherein the volume ratio of the polyvinyl alcohol to the ethanol is 1: 10.
(3) and (3) preparing slurry, adding the mixture obtained in the step (1) into first solvent water, uniformly stirring, adding the binder and the auxiliary agent obtained in the step (2), and uniformly stirring for 30min to obtain the slurry.
In the obtained slurry, the mass content of the high-entropy alloy is 50%; the mass content of the binder is 5 percent; the mass content of the filler is 15 percent; the mass content of the auxiliary agent is 0.5 percent; the mass content of the first solvent was 29.5%.
(4) And (4) carrying out spray drying treatment on the slurry obtained in the step (3), and granulating to obtain the magnetic material. Wherein the spray drying conditions comprise: the atomization pressure is 0.4 MPa; the flow rate of the atomizing gas is 1m3H; the inlet temperature is 300 ℃; the temperature of the air outlet is 80 ℃.
The grain diameter of the prepared magnetic conductive material is 200-300 meshes.
Examples 17 to 18
Examples 17 to 19 differ from example 16 mainly in the resulting slurry.
In example 17, the mass content of the high-entropy alloy in the obtained slurry was 40%; the mass content of the binder is 8%; the mass content of the filler is 8 percent; the mass content of the auxiliary agent is 0.2 percent; the mass content of the first solvent was 43.8%.
In example 18, the mass content of the high-entropy alloy in the obtained slurry was 30%; the mass content of the binder is 10 percent; the mass content of the filler is 20 percent; the mass content of the auxiliary agent is 1 percent; the mass content of the first solvent was 39%.
The rest is the same as in example 16.
Examples 19 to 20
Examples 19-20 differ from example 16 mainly in the conditions of the spray drying.
In example 19, the conditions of spray drying included: the atomization pressure is 0.5 MPa; fog mistGas flow rate of 3m3H; the inlet temperature is 400 ℃; the temperature of the air outlet is 160 ℃.
In example 20, the conditions of spray drying included: the atomization pressure is 0.6 MPa; the flow rate of the atomizing gas is 5m3H; the inlet temperature is 600 ℃; the temperature of the air outlet is 200 ℃.
The rest is the same as in example 16.
Comparative example 1
In this comparative example, the magnetic conductive material was the existing stainless steel material.
Comparative example 2
In this comparative example, the magnetic conductive material used was the existing melt-blown iron magnetic conductive material.
Test example 1
The magnetic conductive materials of examples 1 to 20 and comparative examples 1 to 2 were tested for their respective properties when applied to cooking utensils, as shown below, and the test results are shown in table 1.
The specific test method is as follows.
Initial power: and testing the initial output power of the cookware by adopting a standard induction cooker.
The concave change: and (3) performing a test on the initial state of the product until the inner concave is within 0.3mm according to GB _ T32147-2015 'domestic induction cooker pot'.
Service life of salt spray: the test was performed according to the neutral salt spray test (NSS) method.
TABLE 1 results of Performance test of each example and comparative example
| Initial power/W | Concave variation/mm | Salt spray test Life/h | |
| Example 1 | 2100 | 1.23 | 126 |
| Example 2 | 2100 | 1.44 | 132 |
| Example 3 | 1900 | 0.97 | 147 |
| Example 4 | 1580 | 0.56 | 108 |
| Example 5 | 1870 | 0.83 | 76 |
| Example 6 | 2100 | 1.12 | 124 |
| Example 7 | 2100 | 1.24 | 128 |
| Example 8 | 2100 | 1.05 | 135 |
| Example 9 | 2100 | 0.95 | 142 |
| Example 10 | 2100 | 1.32 | 158 |
| Example 11 | 2100 | 1.47 | 155 |
| Example 12 | 1900 | 0.86 | 106 |
| Example 13 | 1820 | 0.77 | 88 |
| Example 14 | 2100 | 1.22 | 119 |
| Example 15 | 2100 | 1.26 | 124 |
| Example 16 | 2100 | 1.22 | 122 |
| Example 17 | 2100 | 1.35 | 118 |
| Example 18 | 2100 | 1.52 | 134 |
| Example 19 | 2100 | 1.19 | 118 |
| Example 20 | 2100 | 1.25 | 127 |
| Comparative example 1 | 1600 | 2.8 | 56 |
| Comparative example 2 | 2100 | 1.6 | 8 |
As can be seen from the data in table 1, the magnetic conductive materials provided in examples 1 to 20 of the present application have better magnetic conductivity, are less prone to deformation, have better corrosion resistance, and contribute to prolonging the service life, compared to the existing stainless steel materials or the conventional hot-dipped iron magnetic conductive materials provided in comparative examples 1 and 2.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. A magnetic conductive material is characterized by comprising a high-entropy alloy and a filler;
the high-entropy alloy comprises at least four of Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, Pb, Si and B, and at least comprises one or more of Fe, Co and Ni;
the filler includes at least one of an inorganic porous material and a ceramic material.
2. The magnetic conductive material as claimed in claim 1, wherein in the high-entropy alloy, the atomic percentage of one or more of Fe, Co and Ni is 35 to 85%, and the atomic percentages of the remaining constituent elements are each independently 5 to 35%.
3. A magnetically permeable material according to claim 1, wherein the high entropy alloy comprises at least one of AlCrFeCoNi, AlCrFeTiNi, AlCrFeCoNiCu, alcrfelmni or FeNiAlCr systems.
4. The magnetic permeable material according to claim 1, wherein the inorganic porous material comprises at least one of diatomaceous earth, zeolite, or bentonite; and/or the presence of a gas in the gas,
the ceramic material comprises at least one of titanium carbide, titanium nitride, titanium diboride, silicon carbide, tungsten carbide, silicon nitride, boron nitride, calcium oxide, zirconium oxide, aluminum oxide, chromium oxide or titanium sub-oxide.
5. A magnetically permeable material according to any one of claims 1 to 4, wherein the filler is present in an amount of 1 to 25% by mass of the magnetically permeable material.
6. A magnetically permeable material according to any one of claims 1 to 4, wherein the magnetically permeable material has a particle size of 200 to 1500 mesh.
7. The preparation method of the magnetic conductive material is characterized by comprising the following steps of:
mixing the high-entropy alloy and the filler, and granulating to obtain the magnetic material;
the high-entropy alloy comprises at least four of Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, Pb, Si and B, and at least comprises one or more of Fe, Co and Ni;
the filler includes at least one of an inorganic porous material and a ceramic material.
8. The method for preparing the magnetic conductive material according to claim 7, wherein the mixing and granulating of the high-entropy alloy and the filler specifically comprises:
mixing the high-entropy alloy and the filler and then carrying out ball milling to obtain a mixture;
uniformly mixing the mixture with a binder, a first solvent and an auxiliary agent to obtain slurry; wherein the adjuvant comprises at least one of a surfactant, a defoamer or a dispersant;
and carrying out spray drying on the slurry to obtain the magnetic conductive material.
9. The method for preparing a magnetic conductive material according to claim 8, wherein the method satisfies at least one of the following conditions a) to c):
a) the adhesive comprises an adhesive substance and a second solvent, wherein the adhesive substance comprises at least one of polyvinyl alcohol, polyvinylpyrrolidone or sodium carboxymethyl cellulose;
b) the volume ratio of the bonding substance to the second solvent is 1: 3-1: 20;
c) in the slurry, the mass content of the high-entropy alloy is 30-60%, the mass content of the binder is 1-10%, the mass content of the filler is 5-20%, the mass content of the auxiliary agent is 0.2-1%, and the mass content of the first solvent is 20-70%.
10. The method for preparing the magnetic conductive material according to claim 8, wherein the operating condition of the spray drying satisfies at least one of the following conditions d) to g):
d) the atomization pressure is 0.3MPa to 0.6 MPa;
e) the flow rate of the atomizing gas is 0.5m3/h～5m3/h；
f) The inlet temperature is 200-600 ℃;
g) the temperature of the air outlet is 50-200 ℃.
11. The method for preparing a magnetic conductive material according to any one of claims 7 to 10, wherein the method satisfies at least one of the following conditions h) to j):
h) the grain diameter of the high-entropy alloy is 6.5-25 mu m;
i) the grain diameter of the filler is 6.5-25 mu m;
j) the grain diameter of the prepared magnetic conductive material is 200-1500 meshes.
12. A cooking appliance comprising a magnetically conductive material according to any one of claims 1 to 6 or obtained by the method according to any one of claims 7 to 11.
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