KR102193594B1 - An electromagnetic heating cooker and a method for manufacturing the same - Google Patents

Abstract

The present invention relates to the field of cookware, and discloses an electromagnetic heating cookware and a method of manufacturing the same. The cookware includes a cookware substrate (1) and a magnetically conductive layer (2) formed on at least a part of the outer surface of the cookware substrate (1), of which the cookware substrate (1) and the magnetic conductivity At the interface where the layer 2 contacts, the material of the magnetically conductive layer 2 is inserted into the cookware substrate 1 in a continuous serrated structure. The manufacturing method includes spray-coating magnetic powder on at least a portion of the outer surface of the cookware substrate by an aerodynamic spray coating method to form a magnetic conductive layer, and optionally forming a rust prevention layer on the magnetic conductive layer. . In the cookware manufactured according to the method of the present invention, a strong bonding force is provided between the magnetically conductive layer and the cookware substrate.

Description

Electromagnetic heating cookware and its manufacturing method {AN ELECTROMAGNETIC HEATING COOKER AND A METHOD FOR MANUFACTURING THE SAME}

The present invention relates to the field of cookware, and in particular, to an electromagnetic heating cookware and a method of manufacturing the same.

Materials such as aluminum alloy and 304 stainless steel are widely used in home appliances, but the electromagnetic heating function of these non-magnetic or weakly magnetically conductive material pots is not ideal. Most of the conventional processes of IH inner pot are explosion welding or pressure welding, inserting a thin sheet of 430 stainless steel on the surface of an aluminum alloy, and conducting induction heating by the vortex effect formed by the magnetic 430 stainless steel on the outer surface of the pot under the action of a high-frequency alternating magnetic field. do. However, the process is relatively complex and expensive. In addition, by forming a magnetic conductive metal layer on the bottom of the pot by a method such as thermal spray coating, for example, arc or plasma spray coating, the electromagnetic heating function of these pots may be implemented. However, the thermal spray coating is too hot, the magnetic alloy material is easily oxidized, and the metal wire or iron powder has a small impact on the surface of the pot substrate in a molten or semi-melted state and under low atmospheric pressure. In addition, since the formed magnetic layer is mainly formed on the surface of an aluminum alloy substrate requiring sanding treatment (generally, the roughness of the sanding surface of the aluminum alloy is 3 to 8 μm), it is difficult for iron to be inserted into the substrate. Therefore, the bonding strength between the thermal spray coated iron layer and the aluminum alloy pot substrate is poor. And, when the thermal spray-coated magnetic conductive layer increases to a certain thickness (for example, 0.3-0.6mm), the roughness of the surface increases significantly (for example, 20-60㎛), and the spray-coated rust on the surface increases. The bonding strength of the barrier layer is significantly lowered.

An object of the present invention is to provide an electromagnetic heating cookware and a method for manufacturing the same in order to eliminate defects in which the bonding force between the magnetic conductive layer and the cookware substrate and the rust prevention layer and the magnetic conductive layer in the conventional electromagnetic heating cookware is reduced. .

In order to achieve the above object, an aspect of the present invention provides an electromagnetic heating cookware. The cookware includes a cookware substrate and a magnetic conductive layer formed on at least a portion of the outer surface of the cookware substrate, and at an interface where the cookware substrate and the magnetic conductive layer contact, the material of the magnetic conductive layer is It is inserted into the cookware substrate in a first continuous serrated structure.

Preferably, the cooking utensil further comprises a prevention layer formed on at least a portion of the surface of the magnetic conductive layer, the material of the rust prevention layer at the interface where the magnetic conductive layer and the rust prevention layer are in contact with a second continuous serrated structure Is inserted into the magnetically conductive layer.

Preferably, the maximum height difference between the tooth sprout and the tooth bottom in the first continuous serrated structure is greater than the maximum height difference between the tooth sprout and the tooth bottom in the second continuous serrated structure.

Preferably, in the first continuous serrated structure, the maximum height difference between the tooth spout and the tooth bottom is 10 to 80 μm, and the tooth width is 10 to 80 μm.

Preferably, the maximum height difference between the tooth top and the tooth bottom in the second continuous serrated structure is 5 to 15 μm, and the tooth width is 10 to 30 μm.

Preferably, the thickness of the magnetic conductive layer is 0.1 ~ 0.6mm.

Preferably, the magnetic conductive layer and the rust prevention layer are formed on the bottom of the cookware substrate, or on sidewalls adjacent to the bottom and the bottom of the cookware substrate.

Preferably, the magnetic conductive layer is formed of a magnetic iron alloy; The magnetic iron alloy is at least one of Fe~C alloy, Fe~Si alloy, and Fe~Mn alloy, and the Fe content in the magnetic iron alloy is 95% by weight or more.

Preferably, the material of the cookware substrate is a nonmagnetic or weakly magnetically conductive material, preferably aluminum alloy or 304 stainless steel.

Another aspect of the present invention provides a method of manufacturing the above-described electromagnetic heating cookware, the method,

(1) The magnetic powder is spray coated on at least a part of the outer surface of the cookware substrate by aerodynamic spray coating so that the magnetic conductive layer is formed, and the thickness of the magnetic conductive layer is controlled to form the cookware substrate and the magnetic conductivity. Inserting the material of the magnetically conductive layer into the cookware substrate in a continuous serrated structure at an interface where the layers are in contact, so that a continuous serrated structure is provided on the surface of the magnetically conductive layer; And

(2) forming a rust prevention layer on the magnetically conductive layer.

Preferably, the thickness of the magnetic conductive layer is 0.1 to 0.6 mm.

Preferably, the particle diameter of the magnetic powder is 10 ~ 50㎛.

Preferably, the conditions for performing the aerodynamic spray coating method include a spray pressure of 1 to 5 MPa, a spray distance of 10 to 50 mm, and a gas heating temperature of 200 to 1000°C.

In the electromagnetic heating cookware according to the present invention, the material of the magnetic conductive layer is inserted into the cookware substrate in a continuous serrated structure, and the material of the rust prevention layer is inserted into the magnetic conductive layer in a continuous serrated structure. , Since a strong bonding force is provided between the magnetically conductive layer and the cookware substrate and between the magnetically conductive layer and the rust prevention layer, it is possible to ensure that the magnetically conductive layer and the rust prevention layer are not easily removed or ruptured.

In addition, in the manufacturing method of the electromagnetic heating cookware according to the present invention, a magnetic conductive layer is formed through an aerodynamic spray coating method, and defects such as oxides or gaps are formed at the contact interface between the magnetic conductive layer and the cookware substrate. Since it is not basically present, the magnetic conductive layer allows the amount of heat generated during electromagnetic heating to be better transferred to the cookware substrate, thereby increasing the temperature uniformity of the cookware substrate, and thus a good electromagnetic heating effect can be obtained.

1 is a partial structural schematic diagram of a cooking utensil according to the present invention;
Fig. 2 is a partially enlarged schematic view of the cooking utensil shown in Fig. 1;
3 is a partially enlarged schematic diagram of a contact interface between the magnetically conductive layer and the cookware substrate shown in FIG. 2;
4 is a partially enlarged schematic diagram of a contact interface between the rust prevention layer and the magnetic conductive layer shown in FIG. 2.

In the case of not explaining to the contrary in the present invention, the terms related to the orientation used, for example, "upper" and "lower" usually refer to the upper and lower parts shown in the reference drawings, and "inside" and "outside" refer to the respective parts. It refers to the inside and outside of its own outline.

1 to 4, the electromagnetic heating cookware according to the present invention includes a cookware substrate (1), a magnetic conductive layer (2) formed on at least a part of the outer surface of the cookware substrate (1), and the magnetism. It includes a rust prevention layer 3 formed on at least a part of the surface of the conductive layer 2. Among them, the material of the magnetic conductive layer (2) at the interface where the cookware substrate (1) and the magnetic conductive layer (2) are in contact with the cookware substrate (1) in a first continuous serrated structure The material of the rust prevention layer 3 is inserted into the magnetic conductive layer 2 in a second continuous serrated structure at the interface where the magnetic conductive layer 2 and the rust preventing layer 3 contact.

In the term "continuous serrated structure", "continuous" refers to the successive arrangement of each tooth of the serrated structure, and that there is essentially no platform shape (that is, the shape of a stacked sheet) between two adjacent teeth. Point. Here, the serrated shape is by no means limited to the serrated shape in a strict geometric sense, and may be a combination of various irregular shapes similar to the serrated shape.

In a preferred case, the maximum height difference between the tooth sprout and the tooth floor in the first continuous serrated structure is greater than the maximum height difference between the tooth sprout and the tooth floor in the second continuous serrated configuration. In other words, the roughness formed by the first continuous serrated structure is greater than the roughness formed by the second continuous serrated structure.

In the first continuous serrated structure, the maximum height difference (ΔH1) between the tooth top and the tooth bottom is preferably 10 to 80 μm. In other words, the depth at which the material of the magnetic conductive layer 2 is inserted into the cookware substrate 1 is preferably 10 to 80 μm, and specifically, for example, 10 μm, 15 μm, 20 μm, 25 μm, 30 Μm, 35 µm, 40 µm, 45 µm, 50 µm, 55 µm, 60 µm, 65 µm, 70 µm, 75 µm, 80 µm, and any number within the range consisting of any two of these values. Further preferably, the maximum height difference between the tooth spout and the tooth bottom of the serrated structure is 15 to 70 μm, more preferably 20 to 70 μm, further preferably 20 to 60 μm.

In the first continuous serrated structure, the tooth width (ΔL1) of the serrated structure is preferably 10 to 80 μm. Specifically, for example, 10㎛, 15㎛, 20㎛, 25㎛, 30㎛, 35㎛, 40㎛, 45㎛, 50㎛, 55㎛, 60㎛, 65㎛, 70㎛, 75㎛, 80㎛ And any number within the range consisting of any two of these values. Further preferably, the tooth width of the serrated structure is 20 to 60 μm, more preferably 20 to 50 μm. The tooth width of the serrated structure indicates the horizontal distance between two adjacent tooth floors.

In the second continuous serrated structure, the maximum height difference (ΔH2) between the tooth top and the tooth bottom is preferably 5 to 15 μm. In other words, the depth at which the material of the rust prevention layer 3 is inserted into the magnetic conductive layer 2 is preferably 5 to 15 μm. Specifically, for example, 5㎛, 6㎛, 7㎛, 8㎛, 9㎛, 10㎛, 11㎛, 12㎛, 13㎛, 14㎛, 15㎛ and any within the range consisting of any two of these values It can be a number of Further preferably, the maximum height difference between the tooth top and the tooth bottom of the serrated structure is 6 to 12 μm, more preferably 8 to 10 μm.

In the second continuous serrated structure, the tooth width (ΔL2) of the serrated structure is preferably 10 to 30 μm. Specifically, for example, 10㎛, 12㎛, 14㎛, 16㎛, 18㎛, 20㎛, 22㎛, 24㎛, 26㎛, 28㎛, 30㎛ and any within the range consisting of any two of these values It can be a number of Further preferably, the tooth width of the serrated structure is 12 to 25 μm, more preferably 15 to 25 μm. The tooth width of the serrated structure indicates the horizontal distance between two adjacent tooth floors.

In the present invention, the thickness of the magnetic conductive layer 2 may be 0.05 to 1 mm. Specifically, for example, 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.23mm, 0.25mm, 0.28mm, 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm , 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, 0.51 mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 0.6mm, 0.65mm, 0.7mm, 0.8mm, 0.9mm, and a range consisting of any two of these values It can be any number within. Further preferably, the thickness of the magnetically conductive layer 2 is 0.1 to 0.6 mm, more preferably 0.3 to 0.6 mm.

In the present invention, the formation position of the magnetic conductive layer 2 can be determined according to a conventional method in the present field. For example, the magnetically conductive layer 2 is formed on the bottom of the cookware substrate 1 or on sidewalls adjacent to the bottom and bottom of the cookware substrate 1. In a preferred embodiment, the magnetic conductive layer 2 is formed on the bottom and sidewalls adjacent to the bottom of the cookware substrate 1, and the magnetic conductive layer formed on the bottom and the magnetic conductive layer formed on the sidewall are continuous. Structure. In the above-described preferred embodiment, the height of the magnetic conductive layer formed on the sidewall accounts for 5% or more of the total height of the cookware substrate, preferably 10% or more, more preferably 15% or more, more preferably It occupies 20% or more, most preferably 20-60%.

In the present invention, the magnetic conductive layer 2 may be formed of a conventional magnetic material in the field. In a preferred case, the magnetically conductive layer 2 is formed of a magnetic iron alloy. The magnetic iron alloy may be at least one of Fe~C alloy, Fe~Si alloy, and Fe~Mn alloy. In the magnetic iron alloy, the Fe content may be 95% by weight or more, preferably 95 to 99.5% by weight, more preferably 96 to 99% by weight, and more preferably 96 to 98.5% by weight.

In the present invention, the material of the cookware substrate 1 may be a conventional choice in this field. For example, it may be a nonmagnetic or weakly magnetically conductive material conventional in the art. In a preferred embodiment, in order to match the magnetically conductive layer 2 to obtain a good electromagnetic heating effect, the material of the cookware substrate 1 is selected from aluminum alloy or 304 stainless steel.

In the present invention, the bonding force between the magnetically conductive layer 2 and the cookware substrate 1 may be 30 to 50 MPa. Specifically, for example, 30 MPa, 31 MPa, 32 MPa, 33 MPa, 34 MPa, 35 MPa, 36 MPa, 37 MPa, 38 MPa, 39 MPa, 40 MPa, 41 MPa, 42 MPa, 43 MPa, 44 MPa, 45 MPa, 46 MPa, 47 MPa, 48 MPa, 49 MPa, 50 MPa and these values It may be any number within the range consisting of any two of. Preferably, the bonding force between the magnetically conductive layer 2 and the cookware substrate 1 is 35 to 50 MPa, more preferably 37 to 45 MPa. In the present invention, the bonding force between the magnetically conductive layer 2 and the cookware substrate 1 is detected according to the method specified in "Test of tensile bond strength according to GB/T 8642 to 2002 thermal spray coating".

In the present invention, the rust prevention layer 3 may cover a part of the magnetic conductive layer 3 or may completely cover the magnetic conductive layer 2. The thickness of the rust prevention layer 3 may be 0.02 to 0.08 mm, preferably 0.03 to 0.05 mm. The rust prevention layer 3 may have a single layer or multilayer structure formed of a conventional rust prevention coating layer material in the field. The rust prevention coating layer material may be at least one selected from, for example, a silicon resin, a fluororesin, an epoxy resin, and a resin composition containing aluminum powder or zinc powder, and preferably, a fluororesin and/or aluminum powder or zinc powder It is a resin composition containing.

In the present invention, the bonding force between the rust prevention layer 3 and the magnetically conductive layer 2 may be 5B. The bonding force between the anti-rust layer 3 and the magnetically conductive layer 2 is the method specified in the "Cross Cut Test of GB/T 9286 Color Paint and Varnish Paint Film (GB/T 9286 Color Paint and Varnish Paint Film)" According to the detection.

In the present invention, the electromagnetic heating cookware may be a variety of conventional cooking utensils that heat using electromagnetic, such as an electric pressure cooker, an electric rice cooker, an electric frying pan, a frying pan, a clay pot, and an electromagnetic furnace.

According to the present invention, the method of manufacturing the electromagnetic heating cookware,

(1) A magnetic powder is spray-coated on at least a portion of the outer surface of the cookware substrate by a gas dynamic spray method to form a magnetic conductive layer, and the thickness of the magnetic conductive layer is controlled to form the cooking tool. The material of the magnetic conductive layer is inserted into the cookware substrate in a continuous sawtooth structure at an interface where the substrate and the magnetic conductive layer contact, and a continuous sawtooth structure is provided on the surface of the magnetic conductive layer. Step and

(2) forming a rust prevention layer on the magnetically conductive layer.

In the present invention, the method of forming the magnetic conductive layer is an aerodynamic spray coating method, and is also referred to as a cold spray coating method. Basically no oxidation occurs in the magnetic conductive layer formed by the spray coating method, and the magnetic powder can collide with the cookware substrate at a speed close to twice the speed of sound under high-speed atmospheric pressure, so the coating layer has a very high density. have. In addition, a toothed structure can be formed on the surface of the cookware substrate by collision so that a very strong bonding force can be formed between the magnetically conductive layer and the cookware substrate.

In the present invention, the thickness of the magnetic conductive layer is 0.3 to 0.6 mm. When the formation thickness of the magnetic conductive layer reaches 0.3 ~ 0.6mm, the surface roughness value of the magnetic conductive layer is maintained at a relatively small value, a continuous serrated structure is formed, and between the rust prevention layer and the magnetic conductive layer Ensure to have a strong bonding force.

In the present invention, in order to form a serrated structure having a specific size (ie, the maximum height difference and tooth width between the tooth top and the tooth bottom) on the cookware substrate, the particle diameter of the magnetic powder is preferably 10 It is -50 µm, more preferably 10 to 40 µm, and more preferably 20 to 40 µm. The magnetic powder may be the aforementioned magnetic iron alloy.

In the present invention, the implementation conditions of the aerodynamic spray coating method may include a spray pressure of 1 to 5 MPa, a spray distance of 10 to 50 mm, and a gas heating temperature of 200 to 1000°C. In a preferred embodiment, in the implementation conditions of the aerodynamic spray coating method, the working gas is nitrogen gas, helium gas, or a mixture thereof, the injection pressure is 1 to 5 MPa, the gas heating temperature is 200 to 1000°C, and the gas The speed is 1~2m ³ /min, the powder transfer speed is 5~15kg/h, the spray distance is 10~50mm, the power consumption is 5~25kW, and the powder particle size is 10~50㎛. The injection pressure is specifically, for example, 1 MPa, 1.5 MPa, 2 MPa, 2.1 MPa, 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa, 2.6 MPa, 2.7 MPa, 2.8 MPa, 2.9 MPa, 3 MPa, 3.1 MPa, 3.2 MPa , 3.3 MPa, 3.4 MPa, 3.5 MPa, 3.6 MPa, 3.7 MPa, 3.8 MPa, 3.9 MPa, 4 MPa, 4.5 MPa, 5 MPa, and any number within the range consisting of any two of these values. Preferably, the injection pressure is 2 to 4 MPa. In this specification, pressure refers to an absolute pressure. The gas heating temperature is specifically, for example, 200℃, 300℃, 400℃, 450℃, 500℃, 550℃, 600℃, 650℃, 700℃, 750℃, 800℃, 850℃, 900℃, 1000 It may be any number within the range consisting of °C and any two of these values. Preferably, the gas heating temperature is 500 to 900°C, more preferably 600 to 800°C. Specifically, the spraying distance may be any number within a range consisting of, for example, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, and any two of these values. Preferably, the spraying distance is 20 to 50 mm, more preferably 30 to 50 mm.

In the present invention, the method of manufacturing the cookware, prior to cold spray coating (i.e., aerodynamic spray coating) on the cookware substrate, proceeds with deoiling and degreasing treatment on the cookware substrate, and the surface thereof It may further include the step of maintaining the cleanliness of.

According to a preferred embodiment of the present invention, the cooking tool manufacturing method,

(1) Deoiling and degreasing the surface of the cooking utensil substrate to maintain the cleanliness of the surface

(2) Using aerodynamic spray coating method, magnetic powder is spray-coated on at least a portion of the outer surface (preferably the bottom or bottom and side walls) of the cookware substrate processed in step (1), and the cookware serves Forming a 0.3~0.6mm magnetic conductive layer on a straight

(3) deoiling and degreasing treatment on the cookware substrate on which the magnetically conductive layer is formed, and then spray-coating the anti-rust protective coating layer on the magnetically conductive layer.

Hereinafter, examples of the present invention will be described in more detail through examples and comparative examples.

Examples 1 to 6

The surface of the cookware substrate was subjected to deoiling and degreasing treatment to maintain the cleanliness of the surface. The magnetic powder was spray coated on the bottom of the cookware substrate using an aerodynamic spray coating method to form a magnetic conductive layer. The cookware substrate on which the magnetic conductive layer was formed was subjected to deoiling and degreasing treatment, and thereafter, a rust prevention protective coating layer was spray coated on the magnetic conductive layer. Among them, the operating conditions and magnetic powder in the aerodynamic spray coating process are shown in Table 1. The contact interface between the magnetic conductive layer and the cookware substrate by referring to "GB/T 15748~1995 Manual measuring method of quantitative metallography" The tooth width (△L ₁ ) of the toothed structure formed on the tooth and the maximum height difference between the tooth sprout and the tooth bottom (△H ₁ ), and the tooth width of the toothed structure formed at the contact interface between the rust prevention layer and the magnetic conductive layer (△L ₂ ) and the maximum height difference (△H ₂ ) between the tooth apex and the tooth floor were detected, and "Test of tensile bond strength according to GB/T 8642~2002 thermal spray coating (GB/T 8642~2002) Detects the bonding force between the self-conductive layer and the cookware substrate according to the method specified in the "Cross Cut Test of GB/T 9286 Color Paint and Basini Paint Film". The bonding force between the barrier layer and the magnetically conductive layer was detected. The detection results are shown in Table 2.

Comparative Example 1

A cookware was prepared according to the method of Example 6. However, it was different from Example 6 in that the spray coating process of forming the magnetic conductive layer was carried out using a thermal spray coating method. According to the method specified in "Test of Tensile Bond Strength According to GB/T 8642~2002 Thermal Spray Coating", the bonding force between the magnetically conductive layer and the cookware substrate was detected, and "GB/T 9286 color paint and varnish paint film The bonding force between the rust prevention layer and the magnetically conductive layer was detected according to the method specified in "Cross Cut Test". The detection results are shown in Table 2.

number Type of magnetic powder Magnetic powder
Fe content Magnetic powder
Average particle diameter Gas heating
Temperature jet
pressure Spray coating
Street Example 1 Fe~C alloy 96% by weight 15㎛ 600℃ 2 MPa 30mm Example 2 Fe~Si alloy 96.5% by weight 25㎛ 0℃ 2.5 MPa 40mm Example 3 Fe~Mn alloy 97% by weight 35㎛ 600℃ 3 MPa 50mm Example 4 Fe~C alloy 96% by weight 15㎛ 800℃ 2 MPa 30mm Example 5 Fe~Si alloy 96.5% by weight 25㎛ 800℃ 3 MPa 40mm Example 6 Fe~Mn alloy 97% by weight 35㎛ 800℃ 4 MPa 50mm

number magnetism
Conductive layer
Thickness(mm) Magnetic conductive layer and kitchenware
Between substrates Between rust prevention layer and magnetic conductive layer △H ₁ /㎛ △L ₂ /㎛ Bonding force/MPa △H ₁ /㎛ △L ₂ /㎛ cohesion Example 1 0.3 31 32 37 6 6 5B Example 2 0.35 38 39 39 8 9 5B Example 3 0.4 42 43 42 7 8 5B Example 4 0.45 38 39 43 9 10 5B Example 5 0.5 43 43 44 11 11 5B Example 6 0.6 45 46 45 12 11 5B Comparative Example 1 0.6 ~ ~ 22 ~ ~ 4B

As can be seen from the data in Table 2, in the cookware manufactured according to the method of the present invention, both the magnetic conductive layer and the cookware substrate and between the rust prevention layer and the magnetic conductive layer have strong bonding strength. In combination, the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the specific contents of the above-described embodiments, and within the scope of the technical concept of the present invention, various simple modifications to the technical means of the present invention can be made. Can, and all of these simple modifications belong to the protection scope of the present invention.

In addition, it should be described that each of the specific components described in the above-described specific embodiments can be combined in any suitable manner in a situation where there is no contradiction. In order to avoid unnecessary duplication, the present invention no longer describes various possible combinations.

Further, it is possible to arbitrarily combine between various different embodiments of the present invention, and as long as it does not contradict the spirit of the present invention, it should be viewed as the content disclosed by the present invention.

1: cookware substrate
2: magnetic conductive layer
3: anti-rust layer

Claims (15)

In the electromagnetic heating cookware,
The cookware includes a cookware substrate (1) and a magnetic conductive layer (2) formed on at least a portion of the outer surface of the cookware substrate (1), and the magnetic conductive layer (2) is formed by a cold spray coating method. Become,
At the interface where the cookware substrate 1 and the magnetic conductive layer 2 contact, the material of the magnetic conductive layer 2 is inserted into the cookware substrate 1 in a first continuous serrated structure, ,
The thickness of the magnetic conductive layer 2 is 0.1 ~ 0.6mm,
The cookware further includes a rust prevention layer 3 formed on at least a portion of the surface of the magnetic conductive layer 2,
The material of the rust prevention layer 3 is inserted into the magnetic conductive layer 2 in a second continuous sawtooth structure at the interface where the magnetic conductive layer 2 and the rust prevention layer 3 contact,
The first continuous serrated structure and the second continuous serrated composition are formed by a cold spray coating method, and the roughness of the first continuous serrated structure is greater than that of the second continuous serrated structure, Kitchenware. The method of claim 1,
The kitchenware, wherein the maximum height difference between the tooth top and the tooth bottom in the first continuous serrated structure is greater than the maximum height difference between the tooth top and the tooth bottom in the second continuous serrated structure. The method of claim 1,
In the first continuous serrated structure, the maximum height difference between the tooth top and the tooth bottom is 10 to 80 μm, and the tooth width is 10 to 80 μm. The method of claim 1,
In the second continuous serrated structure, the maximum height difference between the top of the tooth and the bottom of the tooth is 5 to 15 μm, and the width of the tooth is 10 to 30 μm. The method of claim 1,
The magnetically conductive layer 2 and the rust prevention layer 3 are formed on the bottom of the cookware substrate 1, or on the sidewalls adjacent to the bottom and the bottom of the cookware substrate 1 Kitchenware. The method of claim 1,
The magnetically conductive layer 2 is formed of a magnetic iron alloy. The method of claim 6,
The magnetic iron alloy is at least one of Fe~C alloy, Fe~Si alloy, and Fe~Mn alloy, and the Fe content in the magnetic iron alloy is 95% by weight or more, kitchenware. The method of claim 1,
The cookware substrate 1 is made of a non-magnetic or weakly magnetically conductive material. The method of claim 8,
The material of the cookware substrate (1) is aluminum alloy or 304 stainless steel, cookware. In the manufacturing method of the cookware according to any one of claims 1 to 9,
The above method,
(1) The magnetic conductive layer 2 is formed by spray-coating magnetic powder on at least a portion of the outer surface of the cookware substrate 1 by an aerodynamic spray coating method, and the cooking is performed by controlling the thickness of the magnetic conductive layer. At the interface between the tool substrate and the magnetic conductive layer, the material of the magnetic conductive layer is inserted into the cookware substrate in a continuous serrated structure, and a continuous serrated structure is provided on the surface of the magnetic conductive layer. Step to do; And
(2) forming a rust prevention layer on the magnetically conductive layer
How to include. The method of claim 10,
The particle diameter of the magnetic powder is 10 ~ 50㎛, the method. The method of claim 10,
In the implementation conditions of the aerodynamic spray coating method, the spraying pressure is 1 ~ 5MPa, the spraying distance is 10 ~ 50mm, including that the gas heating temperature is 200 ~ 1000 ℃, the method. delete delete delete

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