Magnetic conducting material for a cooking vessel, method of making the same and cooking vessel comprising the magnetic conducting material

Abstract

Provided are a magnetic conductive material for a pot, a preparation method thereof, and a pot comprising the magnetic conductive material. The magnetic conductive material comprises a barium titanate material and a ductile metal material, the barium titanate material being in a range of 60 wt% to 80 wt% and the ductile metal material being in a range of 20 wt% to 40 wt% based on the total weight of the magnetic conductive material. The magnetic conductive material can undergo a paraelectric-ferroelectric phase transition in a temperature range of 125 DEG C to 135 DEG C (for example, at 130 DEG C), reducing the generated heat so that the heating temperature is controlled. The pot comprising the magnetic conductive material can fluctuate in temperature in a range of 100 DEG C to 150 DEG C when heated on an electromagnetic oven, achieving the purpose of temperature control, and can also prevent the food in the pot from being burnt.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cookware, and more particularly, to a magnetic material for a pot, a method of manufacturing the magnetic material, and a pot including the magnetic material. BACKGROUND

[0002] The conventional induction cooker uses a built-in magnetic metal sheet (e.g., iron sheet) to heat food (as shown in FIG. 1). When the magnetic metal sheet heats and cooks food in a soup, the food in contact with the magnetic metal sheet is often scorched, and the scorched food sticking to the magnetic metal sheet is difficult to clean and affects the taste of the soup. Figure 1 SUMMARY

[0003] The present application aims to provide a magnetic material and a method of manufacturing the magnetic material, which can undergo a paraelectric-ferroelectric phase transition in a temperature range of 125℃-135℃ (e.g., at 130℃) to reduce the generated heat, so that the heating temperature is controlled.

[0004] Another object of the present application is to provide a pot including the magnetic material, which can cause its temperature to fluctuate in a range of 100-150℃ when heated on an induction cooker to achieve the purpose of temperature control, and can prevent the food in the pot from being scorched.

[0005] According to an aspect of the present application, there is provided a magnetic material for a pot, the magnetic material including a barium titanate material and a ductile metal material, the barium titanate material being in a range of 60wt%-80wt% and the ductile metal material being in a range of 20wt%-40wt% based on the total weight of the magnetic material. The barium titanate material can undergo a paraelectric-ferroelectric phase transition in a temperature range of 125℃-135℃ (e.g., at 130℃), i.e., transition from ferroelectricity to paraelectricity, decrease in magnetic induction intensity, and decrease in heating capacity. The ductile metal material can increase the bonding force with a pot base material.

[0006] In an embodiment of the present application, the ductile metal material can include at least one of aluminum, copper, silver, stainless steel, iron-chromium alloy, and nickel-based alloy. The ductile metal material has good bonding force with the pot base material.

[0007] In an embodiment of the present application, the magnetic material can include a plurality of magnetic particles, each of the plurality of magnetic particles can have a particle size in a range of 20μm-140μm.

[0008] In an embodiment of the present application, the barium titanate material can undergo a magnetic transition in a range of 125℃-135℃. Due to the magnetic transition of the barium titanate, the magnetic material can achieve the purpose of temperature control.​

[0009] In the embodiments of the present application, the magnetic conductive material can include a plurality of magnetic conductive particles, each of at least some of the plurality of magnetic conductive particles can have a cladding structure in which the barium titanate material is surrounded by the ductile metal material. The magnetic conductive material of the cladding structure can provide excellent construction performance for the formation of the magnetic conductive layer.

[0010] According to another aspect of the present application, a method for preparing a magnetic conductive material for a cookware includes the steps of: respectively providing a ductile metal material and a barium titanate material; preparing the ductile metal material and the barium titanate material into a slurry; and spray drying the slurry to obtain the magnetic conductive material, wherein the barium titanate material is in the range of 60wt%-80wt% and the ductile metal material is in the range of 20wt%-40wt% based on the total weight of the magnetic conductive material. The method is simple and low in cost, and can prepare the magnetic conductive material in large quantities.

[0011] In the embodiments of the present application, the ductile metal material can include at least one of aluminum, copper, silver, stainless steel, iron-chromium alloy and nickel-based alloy. The ductile metal material has good bonding force with the base material of the cookware.

[0012] In the embodiments of the present application, the particle size of the barium titanate material can be in the range of 10μm-100μm, the particle size of the ductile metal material can be in the range of 5μm-20μm, the magnetic conductive material can include a plurality of magnetic conductive particles, each of at least some of the plurality of magnetic conductive particles can have a cladding structure in which the barium titanate material is surrounded by the ductile metal material. The magnetic conductive material of the cladding structure can have good heating effect, can have a paraelectric-ferroelectric phase transition at a temperature in the range of 125℃-135℃, and can have excellent construction performance.

[0013] According to still another aspect of the present application, a cookware is provided, which includes a base and a magnetic conductive layer formed on at least part of the surface of the base, the magnetic conductive layer including a magnetic conductive material. The cookware can have its temperature fluctuate in the range of 100-150℃ when heated on an electromagnetic oven, achieving the purpose of temperature control, and can prevent the food in the cookware from being burnt.

[0014] In the embodiments of the present application, the thickness of the magnetic conductive layer can be in the range of 50μm-300μm. If the thickness is greater than 300μm, the manufacturing cost is high, the magnetic conductive effect is not significantly enhanced, and the stress is large, which is easy to break and fall off. If the thickness is less than 50μm, the manufacturing precision is too high, the production is difficult to control, and the resistance is too large, the magnetic conductive efficiency is too low or even cannot be magnetic conductive. When the thickness is in the range of 50μm-300μm, the magnetic conductive effect is obvious and the magnetic conductive efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and / or other aspects and features of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 is a view showing a pot of the prior art.

[0017] Figure 2 is a view showing a pot according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0018] The present application will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the application are shown. The present application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0019] The present application provides a magnetic permeable material for a magnetic flux product (e.g., a pot), which can include (or consist of) a barium titanate material and a ductile metal material.

[0020] According to the inventive concept, the magnetic permeable material can include a plurality of magnetic permeable particles, and at least some of the plurality of magnetic permeable particles can include a coating structure in which each barium titanate material particle is surrounded by a plurality of ductile metal material particles. With such a coating structure, when a magnetic permeable layer is formed using the magnetic permeable material through a spray process, the ductile structure can have good adhesion with a substrate, so that the magnetic permeable particles can form a mechanical bite with the substrate to be firmly attached to the surface of the substrate, thereby providing excellent workability for the formation of the magnetic permeable layer.

[0021] According to the inventive concept, the magnetic permeable material can include a plurality of magnetic permeable particles, and at least some of the plurality of magnetic permeable particles can include a cluster structure in which a plurality of barium titanate material particles and a plurality of ductile metal material particles are bonded together. Based on the same principle as the above-described coating structure, when a magnetic permeable layer is formed using the magnetic permeable material through a spray process, the magnetic permeable material of the cluster structure can provide excellent workability for the formation of the magnetic permeable layer.

[0022] According to the inventive concept, the barium titanate material has a tetragonal crystal system 4mm point group in a temperature range of 125℃ to 5℃, has a significant ferroelectricity, and can be heated by induction of an alternating magnetic field of an electromagnetic oven. When the temperature is in the range of 125℃-135℃ (e.g., at 130℃), the symmetry of the barium titanate material increases, a paraelectric-ferroelectric phase transition (i.e., a transition from ferroelectricity to paraelectricity) occurs, so that the ferroelectricity disappears, the magnetic induction decreases, and the heating capacity decreases.

[0023] According to the inventive concept, the ductile metal material has good ductility and has good bonding force with a pot body (e.g., a pot). When a magnetic conductive material including the ductile metal material is applied to a surface of a pot body using a thermal spray or a cold spray process, powder particles of the ductile metal material are deformed to form a good mechanical interlock with the pot body, and thus a magnetic conductive coating including the ductile metal material can be firmly attached to the surface of the pot body. That is, a suitable metal material capable of improving an application performance (i.e., a spray performance of a material) can be used as the ductile material of the inventive concept.

[0024] In an embodiment of the present invention, the ductile metal material can not have magnetism (i.e., be non-magnetic). In this case, the ductile metal material can include aluminum, copper, and / or silver. In another embodiment of the present invention, the ductile metal material can have magnetism (i.e., be magnetic), and in this case, the ductile metal material can include at least one of stainless steel, an iron-chromium alloy, and a nickel-based alloy. Examples of the nickel-based alloy can include Ni-Cr alloy powder, Ni-Cr-Mo alloy powder, Ni-Cr-Fe alloy powder, Ni-Cu alloy powder, Ni-P and Ni-Cr-P alloy powder, Ni-Cr-Mo-Fe alloy powder, Ni-Cr-Mo-Si high wear-resistant alloy powder, Ni-Cr-Fe-Al alloy powder, Ni-Cr-Fe-Al-B-Si alloy powder, Ni-Cr-Si alloy powder, Ni-Cr-W-based wear-resistant and corrosion-resistant alloy powder, etc. The ductile metal material having magnetism can generate heat in an alternating magnetic field, and the ductile metal material not having magnetism does not generate heat in an alternating magnetic field.

[0025] Therefore, in the inventive concept, since the barium titanate material is included, the magnetic conductive material can maintain a magnetic flux product having the magnetic conductive material attached thereto in a certain temperature range during heating, and since the ductile metal material improves an application performance of the magnetic conductive material.

[0026] In the embodiments of the present application, the barium titanate material can be in the range of 60wt%-80wt%, for example, in the range of 62wt%-78wt%, 64wt%-76wt%, 66wt%-74wt%, 68wt%-72wt%, based on the total weight of the magnetically conductive material. The ductile metal material can be in the range of 20wt%-40wt%, for example, in the range of 22wt%-38wt%, 24wt%-36wt%, 26wt%-34wt%, 28wt%-32wt%. When the content of the ductile metal material is lower than 20wt%, the ductility of the magnetically conductive material is insufficient, and the adhesion to the pot body is poor when the magnetically conductive material is sprayed. When the content of the ductile metal material is higher than 40wt%, the magnetically conductive material generates less heat, and the temperature rises slowly, and the heating efficiency is low. Therefore, when the content of each component of the magnetically conductive material is in the above range, the pot including the magnetically conductive material not only has a long service life, but also fluctuates in the temperature range of 100°C-150°C (for example, 100-140°C) in the alternating magnetic field, so that the food heated therein is not easy to burn, and is easy to clean.

[0027] According to the inventive concept of the present application, in the magnetically conductive material in which the ductile metal material has no magnetism, according to the magnetic transition property of the barium titanate material, when the temperature is lower than 125°C, only the barium titanate material is the heat generating material; when the temperature is higher than 125°C, the barium titanate material is transformed into paraelectricity, and due to the decrease of its magnetic conductivity, the heat generation is reduced (or no heat is generated), the pot itself is transformed from the state of heat absorption being greater than heat release to the state of heat release being greater than heat absorption, and the temperature decreases and falls back; when the temperature is lower than 125°C, the barium titanate material is transformed into ferroelectricity, the magnetic conductivity is increased, the generated heat is increased, the pot itself is transformed from the state of heat release being greater than heat absorption to the state of heat absorption being greater than heat release, and the temperature is increased. Therefore, the temperature of the pot fluctuates in the range of 100°C-150°C (for example, 100°C-140°C).

[0028] According to the inventive concept of the present application, in the magnetically conductive material in which the ductile metal material has no magnetism, according to the magnetic transition property of the barium titanate material, when the temperature is lower than 125°C, only the barium titanate material is the heat generating material; when the temperature is higher than 125°C, the barium titanate material is transformed into paraelectricity, and due to the decrease of its magnetic conductivity, the heat generation is reduced (or no heat is generated), the pot itself is transformed from the state of heat absorption being greater than heat release to the state of heat release being greater than heat absorption, and the temperature decreases and falls back; when the temperature is lower than 125°C, the barium titanate material is transformed into ferroelectricity, the magnetic conductivity is increased, the generated heat is increased, the pot itself is transformed from the state of heat release being greater than heat absorption to the state of heat absorption being greater than heat release, and the temperature is increased. Therefore, the temperature of the pot fluctuates in the range of 100°C-150°C (for example, 100°C-140°C).

[0029] In the following, a method for preparing the magnetically conductive material for a pot according to the present application will be described in connection with exemplary embodiments, and the description of the materials and their properties already described above will be omitted in the following.

[0030] The method of manufacturing the magnetic permeable material according to the exemplary embodiments can include: providing a ductile metal material and a barium titanate material, respectively; preparing the ductile metal material and the barium titanate material into a slurry; and spray-drying the slurry to obtain the magnetic permeable material.

[0031] According to the exemplary embodiments, various methods can be employed to provide the ductile metal material and the barium titanate material that have been described above in connection with the exemplary embodiments. For example, a ball milling method can be employed to provide the ductile metal material and the barium titanate material. According to a specific example, a commercially available barium titanate material and at least one of aluminum, copper, silver, stainless steel, iron-chromium alloy, and nickel-based alloy can be selected as the ductile metal material, and the ductile metal material and the barium titanate material can be ball milled to a predetermined particle size using a ball mill. However, the inventive concept is not limited thereto, and for example, those skilled in the art can employ the prior art to provide the ductile metal material and the barium titanate material having a predetermined particle size.

[0032] For example, when the magnetic permeable material according to the exemplary embodiments is formed using the coating method to be described later, the particle size of the ductile metal material can be controlled to be in the range of 5 μm to 20 μm using a particle size control apparatus such as a ball mill, and the particle size of the barium titanate material can be controlled to be in the range of 10 μm to 100 μm. In addition, during the ball milling, the distribution of the particle size of the obtained ductile metal material can be concentrated (e.g., in accordance with a normal distribution), and the distribution of the particle size of the obtained barium titanate material can be concentrated (e.g., in accordance with a normal distribution) to facilitate subsequent processes such as slurry preparation and spray drying. For another example, when the magnetic permeable material according to the exemplary embodiments is formed using the granulation method to be described later, the particle size of the ductile metal material can be controlled to be in the range of 10 μm to 100 μm using a particle size control apparatus such as a ball mill, and the particle size of the barium titanate material can be controlled to be in the range of 10 μm to 100 μm. In addition, during the ball milling, the particle size of the obtained ductile metal material can be made as uniform as possible, and the particle size of the obtained barium titanate material can be made as uniform as possible to facilitate subsequent processes such as slurry preparation and spray drying.

[0033] After the ductile metal material and the barium titanate material having a predetermined particle size are provided, the ductile metal material and the barium titanate material can be prepared into a slurry.

[0034] In the step of preparing the slurry, the ductile metal material and the barium titanate material of the predetermined particle size composition can be mixed into a solution to prepare the slurry having a solid content in the range of 20 wt% to 70 wt%, wherein the solution can include 1 wt% to 4 wt% of a binder, 0.5 wt% to 1 wt% of a dispersant, 1 wt% to 2 wt% of an antifoaming agent, and the balance of deionized water based on the total weight of the solution. The binder can include polyvinyl alcohol, polyvinyl polyol, hydroxymethyl cellulose, hydroxyethyl cellulose, and / or hydroxypropyl methyl cellulose. The dispersant can be citric acid and / or triethylhexyl phosphoric acid, and the antifoaming agent can be polyether-modified silicone oil and / or silicone oil.

[0035] After the slurry is prepared, a step of spray drying can be performed on the slurry to obtain a magnetic permeable material including a plurality of magnetic permeable particles.

[0036] According to exemplary embodiments, a coating method or a granulation method, etc. can be employed to form the magnetic permeable material using the step of spray drying. Here, the coating method and the granulation method include the same process, and the difference is only in the particle size composition of the ductile metal material and the barium titanate material in the slurry. For example, when the coating method is employed to form the magnetic permeable material, the particle size of the barium titanate material can be in the range of 10 μm to 100 μm and can be controlled to be relatively large, and the particle size of the ductile metal material can be in the range of 5 μm to 20 μm and can be controlled to be relatively small, so that in the step of spray drying, a plurality of small particle size ductile metal materials can be attached (coated) to the outer surface of the large particle size barium titanate material, and a coating structure is formed. For another example, when the granulation method is employed to form the magnetic permeable material, the particle size of the barium titanate material and the particle size of the ductile metal material can be controlled in the range of 10 μm to 100 μm and can be controlled to be substantially uniform, so that in the subsequent step of spray drying, due to the uniformity of the particle size, a coating structure cannot be formed, but a cluster structure in which the ductile metal material and the barium titanate material are uniformly bonded is formed. However, exemplary embodiments are not limited thereto.

[0037] According to exemplary embodiments, in the step of spray drying, the material after ball milling can be delivered to a high-speed spinning liquid disc of 6000 rpm to 15000 rpm (for example, 6000 rpm to 12000 rpm) to form drops. The drops can be blown by hot air of 60°C to 100°C into a drying tower of 100°C to 400°C, and the drops form spherical, solid powder particles in the process of descending for 5 seconds to 15 seconds. Since the particle size of the original powder particles is small, and the particle size of the powder particles after adhesion or coating is also relatively small, the powder particles can be spun out at a relatively low rotation speed (for example, 6000 rpm to 12000 rpm).

[0038] After the spray drying, the magnetic conductive material including the plurality of magnetic conductive particles having a predetermined particle size can be obtained. As described above, the magnetic conductive material can be formed by the coating method or the granulation method, and thus the magnetic conductive material can have different particle size compositions according to the coating method or the granulation method. For example, when the magnetic conductive material is formed by the coating method, the magnetic conductive particles in the magnetic conductive material can have a particle size of 20 μm to 140 μm (e.g., 40 μm to 120 μm, 60 μm to 110 μm, 70 μm to 100 μm, or 80 μm to 90 μm); when the magnetic conductive material is formed by the granulation method, the magnetic conductive particles in the magnetic conductive material can have a particle size of 30 μm to 300 μm (e.g., 50 μm to 280 μm, 70 μm to 250 μm, 100 μm to 200 μm, 120 μm to 180 μm, or 140 μm to 160 μm). However, the exemplary embodiments are not limited thereto.

[0039] After the spray drying to obtain the plurality of magnetic conductive particles, a sintering step can be performed on the magnetic conductive particles. Specifically, the powder particles after the spray drying described above can be sintered by using a sintering machine to remove the moisture in the powder particles. The sintering curve can be prepared according to the physical properties of the raw powder, and according to the exemplary embodiments, the temperature increasing rate can be generally 5°C / min to 20°C / min (e.g., 5°C / min to 10°C / min), and the holding time can be 3 hours to 30 hours (e.g., 3 hours to 10 hours). Since the powder particles have a small particle size, the desired effect can be achieved at a slow temperature increasing rate and a short holding time.

[0040] According to the above description in connection with the exemplary embodiments, the magnetic conductive material including the plurality of magnetic conductive particles according to the inventive concept can be obtained. When the magnetic conductive structure is formed on at least a portion of the surface (e.g., the bottom surface) of the base of the cookware by using a layer forming process (e.g., thermal spraying or cold spraying), the cookware having the temperature control performance according to the inventive concept can be obtained.

[0041] Figure 2 FIG. 1 is a view showing a cookware including a magnetic conductive material according to an embodiment of the present application.

[0042] Referring to Figure 2 , the cookware can include a cookware body and a magnetic conductive layer formed on at least a portion of the surface (e.g., the outer bottom surface and / or the inner bottom surface) of the cookware body, and the magnetic conductive layer can include the magnetic conductive material described above. The magnetic conductive material can be sprayed on the bottom surface of the cookware body by using a spraying process (e.g., cold spraying or thermal spraying) to form the magnetic conductive layer. The cookware can have its temperature fluctuate in the range of 100°C to 150°C when heated on an induction cooktop, thereby achieving the temperature control purpose and preventing the food in the cookware from being burnt.

[0043] The method of preparing the magnetic conductive material according to the present application will be described in detail below with examples.

[0044] Example 1

[0045] A pot according to Example 1 was prepared by the following steps.

[0046] 1. Preparation of magnetic conductive material.

[0047] The barium titanate material was ball milled to 20 μm and the Ni-Cu alloy powder was ball milled to 5 μm. The barium titanate material and the Ni-Cu alloy powder were then mixed in a solution in a weight ratio of 80:20 to prepare a slurry with a solid content of 60 wt%, wherein the solution comprises 2 wt% of polyvinyl alcohol, 1 wt% of citric acid and 2 wt% of polyether modified silicone oil and the balance is deionized water. The slurry was delivered to a high speed spinning disc at 8000 revolutions per minute to form drops, which were blown by hot air at 70 °C into a drying tower at 300 °C. During the falling process, the drops formed spherical powder particles after 10 seconds. The powder particles were sintered at a heating rate of 7 °C per minute for 6 hours. The sintered powder particles were sieved to obtain a magnetic conductive material with an average particle size of 80 μm.

[0048] 2. Preparation of pot.

[0049] The pot substrate was selected to be a ceramic pot and the outer bottom of the ceramic pot was sand blasted. The above prepared magnetic conductive material was preheated and plasma sprayed. The preheating function was to improve the powder flowability and prevent gun blockage. The thickness of the coating formed by spraying was 100 μm.

[0050] Plasma parameters: main gas flow: 1500 L / H; hydrogen: 100 L / H; voltage: 50 V; current: 500 A; powder feeding rate: 30 g / min; gun nozzle specification: 5 mm diameter straight hole gun nozzle.

[0051] After plasma spraying, the magnetic conductive layer was sanded to obtain a smooth magnetic conductive ceramic pot sample.

[0052] Example 2

[0053] A pot according to Example 2 was manufactured using the same method as Example 1 except that the weight ratio of the barium titanate material to the Ni-Cu alloy powder was 70:30.

[0054] Example 3

[0055] A pot according to Example 3 was manufactured using the same method as Example 1 except that the weight ratio of the barium titanate material to the Ni-Cu alloy powder was 60:40.

[0056] Example 4

[0057] A pot according to Example 4 was manufactured in the same manner as in Example 1, except that the weight ratio of the barium titanate material to the Ni-Cu alloy powder was 62:38.

[0058] Example 5

[0059] A pot according to Example 5 was manufactured in the same manner as in Example 1, except that the weight ratio of the barium titanate material to the Ni-Cu alloy powder was 65:35.

[0060] Example 6

[0061] A pot according to Example 6 was manufactured in the same manner as in Example 1, except that the weight ratio of the barium titanate material to the Ni-Cu alloy powder was 75:25.

[0062] Example 7

[0063] A pot according to Example 7 was manufactured in the same manner as in Example 1, except that aluminum was used instead of the Ni-Cu alloy powder.

[0064] Example 8

[0065] A pot according to Example 8 was manufactured in the same manner as in Example 1, except that a ferrochrome alloy (Fe-Cr alloy) was used instead of the Ni-Cu alloy powder.

[0066] Example 9

[0067] A pot according to Example 9 was manufactured in the same manner as in Example 1, except that stainless steel was used instead of the Ni-Cu alloy powder.

[0068] Example 10

[0069] A pot according to Example 10 was manufactured in the same manner as in Example 1, except that a magnetic conductive layer having a thickness of 50 μm was formed.

[0070] Example 11

[0071] A pot according to Example 11 was manufactured in the same manner as in Example 1, except that a magnetic conductive layer having a thickness of 200 μm was formed.

[0072] Example 12

[0073] A pot according to Example 12 was manufactured in the same manner as in Example 1, except that a magnetic conductive layer having a thickness of 300 μm was formed.

[0074] Example 13

[0075] A pot according to Example 13 was manufactured by the same method as Example 1, except that the particle size of the barium titanate material was 10 μm.

[0076] Example 14

[0077] A pot according to Example 14 was manufactured by the same method as Example 1, except that the particle size of the barium titanate material was 40 μm.

[0078] Example 15

[0079] A pot according to Example 15 was manufactured by the same method as Example 1, except that the average particle size of the magnetic conductive material was 140 μm.

[0080] Example 16

[0081] A pot according to Example 16 was manufactured by the same method as Example 15, except that the particle size of the barium titanate material was 100 μm.

[0082] Example 17

[0083] A pot according to Example 17 was manufactured by the same method as Example 1, except that the particle size of the Ni-Cu alloy powder was 20 μm.

[0084] Comparative Example 1

[0085] A pot according to Comparative Example 1 was manufactured by the same method as Example 1, except that only the Ni-Cu alloy powder was used as the magnetic conductive material.

[0086] Comparative Example 2

[0087] A pot according to Comparative Example 2 was manufactured by the same method as Example 1, except that the weight ratio of the barium titanate material to the Ni-Cu alloy powder was 30:70.

[0088] Comparative Example 3

[0089] A pot according to Comparative Example 3 was manufactured by the same method as Example 1, except that the weight ratio of the barium titanate material to the Ni-Cu alloy powder was 90:10.

[0090] Comparative Example 4

[0091] In addition to using only the barium titanate material as the magnetic conductive material, a pot according to Comparative Example 4 was manufactured using the same method as that of Example 1.

[0092] The above-prepared pot was subjected to a bottom temperature test and a porridge cooking test, and the test results are shown in Table 1 below.

[0093] Test method:

[0094] 1) Bottom temperature test: The sample to be tested was heated on a household electromagnetic oven for 15 min, and then a temperature measurement was made at a point 1 / 2R from the bottom of the ceramic pot using a probe-type temperature meter, and the temperature change range of the bottom from 3 min to 15 min was recorded.

[0095] 2) Porridge cooking test: 300 g of rice and 450 g of water were placed in the ceramic pot to be tested, and the ceramic pot was heated on an electromagnetic oven at a power of 2000 W; after the water was boiled, the power was reduced to 800 W for 15 min, and then the electromagnetic oven was turned off, and the lid was covered for 3 min.

[0096] Table 1

[0097]

[0098]

[0099] From the comparison of Examples 1 to 17 according to the inventive concept and Comparative Examples 1 to 4, it can be seen that the temperature of the pot including the magnetic conductive layer formed of the magnetic conductive material according to the inventive concept can be constant in the range of 100 to 140°C, and can achieve the general purpose of the electromagnetic oven. The pot according to the inventive concept can fluctuate in the range of 100 to 140°C during the operation of the electromagnetic oven, achieving the purpose of temperature control, and can prevent the food in the pot from being burnt.

[0100] While the application has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application as defined by the appended claims and their equivalents. Embodiments should be considered in a descriptive sense only and not for purposes of limitation. Therefore, the scope of the application is defined not by the detailed description of the application but by the appended claims, which are to be interpreted in their broadest acceptable manner, using the principles of inclusion and / or exclusion appropriately.

Claims

1. A magnetic conducting material, characterized by, The magnetic conductive material is a spraying material for a magnetic conductive layer of a pot, comprising barium titanate material capable of undergoing paraelectric-ferroelectric phase transition and ductile metal material capable of improving the spraying performance of the magnetic conductive material and having non-magnetic property, and having a coating structure in which the barium titanate material is surrounded by the ductile metal material or a cluster structure in which a plurality of barium titanate material particles and a plurality of ductile metal material particles are bonded together. The barium titanate material is in a range of 60wt%-80wt% and the ductile metal material is in a range of 20wt%-40wt% based on the total weight of the magnetic conductive material.

2. The magnetically permeable material of claim 1, wherein, The ductile metal material comprises at least one of aluminum, copper and silver.

3. The magnetically permeable material of claim 1, wherein, The magnetic conductive material comprises a plurality of magnetic conductive particles, each of which has a particle size in a range of 20μm-140μm.

4. The magnetically permeable material of claim 1, wherein, The barium titanate material undergoes magnetic transition in a range of 125℃-135℃.

5. The magnetically permeable material of claim 1, wherein, The particle size of the barium titanate material is 10μm-100μm; and / or the particle size of the ductile metal material is 5μm-100μm.

6. A method of making a cookware, characterized by, The method comprises the following steps: Providing the ductile metal material capable of improving the spraying performance of the magnetic conductive material and having non-magnetic property and the barium titanate material capable of undergoing paraelectric-ferroelectric phase transition respectively; Preparation of the ductile metal material and the barium titanate material into a slurry; Spray drying of the slurry to obtain the magnetic conductive material having a coating structure in which the barium titanate material is surrounded by the ductile metal material or a cluster structure in which a plurality of barium titanate material particles and a plurality of ductile metal material particles are bonded together, The barium titanate material is in a range of 60wt%-80wt% and the ductile metal material is in a range of 20wt%-40wt% based on the total weight of the magnetic conductive material; Spraying the magnetic conductive material on the surface of the pot body by a spraying process so that the ductile metal material in the magnetic conductive material is attached to the pot body, thereby forming a magnetic conductive layer on the surface of the pot body.

7. The method of claim 6, wherein, The ductile metal material comprises at least one of aluminum, copper and silver.

8. The method of claim 6, wherein The magnetic conductive material has a coating structure, the particle size of the barium titanate material is in a range of 10μm-100μm, and the particle size of the ductile metal material is in a range of 5μm-20μm.

9. A pan, characterized in that The pot comprises a pot prepared by the method of any one of claims 6-8 or comprises a pot body and a magnetic conductive layer formed on at least part of the surface of the pot body, wherein the magnetic conductive layer comprises the magnetic conductive material of any one of claims 1-5.

10. The pot of claim 9, wherein The thickness of the magnetic conductive layer is in a range of 50μm-300μm.

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