JP2018183565A - Cooking apparatus for electromagnetic heating, and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooking apparatus for electromagnetic heating which increases binding force between a magnetically permeable layer and a cooking apparatus base body and between an anticorrosive layer and the magnetically permeable layer: and to provide a method for manufacturing the apparatus.SOLUTION: A cooking apparatus for electromagnetic heating includes a cooking apparatus base body 1, and a magnetically permeable layer 2 formed on an outer surface of at least part of the cooking apparatus base body 1. Material for the magnetically permeable layer 2 is fitted to the cooking apparatus base body 1 in a continuous sawtooth structure in a boundary surface where the cooking apparatus base body 1 and the magnetically permeable layer 2 come in contact with each other. A method for manufacturing a cooking apparatus comprises: a step for forming the magnetically permeable layer by spraying magnet powder on at least part of the cooking apparatus base body by an air power spray method; and a step for selectively forming the anticorrosion layer on the magnetically permeable layer. Strong binding force is provided between the magnetically permeable layer and the cooking apparatus base body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to the field of cooking utensils, and more specifically to cooking utensils for electromagnetic heating and a method for manufacturing the same.

  Materials such as aluminum alloy and 304 stainless steel are very widely used in home appliances, but the electromagnetic heating function is not ideal for these non-magnetic or low-permeability pots. The conventional process of IH inner pot mainly uses explosion welding or pressure welding method, 430 stainless steel thin plate is given on the surface of aluminum alloy, and magnetic 430 stainless steel on the outer surface of the pan appliance is high frequency. Induction heating is performed by an eddy current effect formed by the action of an alternating magnetic field. However, the process is relatively complex and costly. Moreover, the magnetic heating function of these pan appliances can be realized by manufacturing a magnetically permeable metal layer on the bottom of the pan by means of hot spraying, for example, arc or plasma spraying. However, since the temperature of the hot spray is too high, the magnetic alloy material is easily oxidized, and the speed at which the metal iron wire or iron powder collides with the substrate surface of the pan apparatus at a relatively low pressure in a molten or semi-molten state. The magnetic layer formed is relatively low and mainly covers the surface of the aluminum alloy substrate that needs to be sandblasted (generally the surface roughness of the sandblasted aluminum alloy is 3-8 μm) Since it is difficult to fit into the base, the bonding force between the hot sprayed iron layer and the base of the aluminum alloy pan is relatively poor. In addition, when the hot sprayed magnetic permeability layer increases to a certain thickness (for example, 0.3 to 0.6 mm), the surface roughness obviously increases (for example, 20 to 60 micrometers), and the The bond strength of the rust stop layer sprayed on the surface is clearly reduced.

  In order to overcome the defect that the coupling force between the magnetically permeable layer and the cookware base and the rust-preventing layer and the magnetically permeable layer in the conventional cooking utensils for electromagnetic heating is relatively poor, It aims at providing the cooking utensil for heating, and its manufacturing method.

  In order to achieve the above object, one aspect of the present invention provides a cooking utensil for electromagnetic heating. The cooking utensil includes a cooking utensil base and a magnetically permeable layer formed on an outer surface of at least a part of the cooking utensil base, and at the interface where the cooking utensil base and the magnetic permeable layer are in contact with each other, The material of the permeable layer is fitted into the cookware base in a first continuous serrated structure.

  Preferably, the cooking utensil further includes a rust preventive layer formed on at least a part of the surface of the magnetically permeable layer, and the material of the rust preventive layer is the first at the interface where the magnetically permeable layer and the rust preventive layer are in contact with each other. Two continuous serrated structures are fitted into the magnetically permeable layer.

  Preferably, the maximum height difference between the tooth tip and the root in the first continuous serrated structure is larger than the maximum height difference between the tooth tip and the root in the second continuous saw tooth structure.

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

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

  Preferably, the thickness of the magnetically permeable layer is 0.1 to 0.6 millimeter.

  Preferably, the magnetic permeable layer and the rust preventive layer are formed on the bottom of the cooking utensil base or on the bottom of the cooking utensil base and the side wall adjacent to the bottom.

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

  Preferably, the material of the cooking utensil base is a non-magnetic material or a material with low magnetic permeability, preferably aluminum alloy or 304 stainless steel.

Another aspect of the present invention provides a method of manufacturing the electromagnetic heating cooking utensil. The method
(1) By air-powered spray method, the magnetic powder is sprayed on the outer surface of at least a part of the cooking utensil base to form a magnetically permeable layer, and the thickness of the magnetically permeable layer formed is controlled, A serrated structure in which the material of the magnetically permeable layer is fitted into the cookware base with a continuous serrated structure at the interface where the cookware base and the permeable layer are in contact with each other, and is continuous with the surface of the permeable layer. And having a step of having
(2) forming a rust-preventing layer on the magnetically permeable layer.

  Preferably, the thickness of the magnetically permeable layer is 0.1 to 0.6 millimeter.

  Preferably, the magnetic powder has a particle size of 10 to 50 micrometers.

  Preferably, the implementation conditions of the air-powered spray method are an injection pressure of 1 to 5 MPa, an injection distance of 10 to 50 millimeters, and a gas heating temperature of 200 to 1000 ° C.

  In the cooking utensil for electromagnetic heating provided by the present invention, the material of the magnetically permeable layer is fitted into the cooking utensil base with a continuous sawtooth structure, and the material of the rust-preventing layer is continuous with the serrated structure in the magnetically permeable layer. By being fitted, there is a strong bonding force between the permeable layer and the cookware base and between the permeable layer and the rust preventive layer, and the permeable layer and the rust preventive layer fall off or rupture. It can be guaranteed to be difficult.

  Further, in the method for manufacturing a cooking utensil for electromagnetic heating provided by the present invention, a permeable layer is formed by an air power spray method, and an oxide is formed at a contact interface between the permeable layer and the cooking utensil base. Since there are almost no defects such as air gaps and voids, it can be ensured that the heat generated by the magnetically permeable layer during electromagnetic heating is better conducted to the cookware substrate, improving the temperature uniformity of the cookware substrate Thus, a good electromagnetic heating effect can be obtained.

FIG. 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. FIG. 3 is a partially enlarged schematic view of a contact interface between the magnetically permeable layer and the cooking utensil base shown in FIG. 2. 4 is a partially enlarged schematic view of a contact interface between the rust preventive layer and the magnetically permeable layer shown in FIG.

  In the present invention, unless there is a contradictory description, orientation terms used, for example, “up” and “down” usually refer to the top and bottom shown in the drawings, and “in” and “out” refer to the inside of each component itself, Point outside.

  As shown in FIGS. 1 to 4, a cooking utensil for electromagnetic heating according to the present invention includes a cooking utensil base 1, a magnetically permeable layer 2 formed on at least a part of the outer surface of the cooking utensil base 1, and A rust-preventing layer 3 formed on at least a part of the surface of the magnetically permeable layer 2, and the material of the permeable layer 2 is a first material at the interface where the cooking utensil base 1 and the magnetically permeable layer 2 are in contact with each other. The material of the rust preventive layer 3 is a second continuous serrated structure at the interface where the magnetically permeable layer 2 and the rust preventive layer 3 come into contact with each other. The magnetically permeable layer 2 is fitted.

  In the term “continuous sawtooth structure”, “continuous” means that each sawtooth of the sawtooth structure is arranged in succession, and there is almost a platform (ie, layered) between two adjacent sawtooth. Point to not. The sawtooth shape here is not limited to the sawtooth shape in a strict geometric sense, and may be a combination of various irregular shapes similar to the sawtooth shape.

  Preferably, the maximum height difference between the tooth tip and the root in the first continuous serrated structure is greater than the maximum height difference between the tooth tip and the root in the second continuous serrated structure, 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 (ΔH ₁ ) between the tooth tip and the tooth bottom is preferably 10 to 80 micrometers, that is, the material of the permeable layer 2 is applied to the cooking utensil base 1. The depth to be inserted is preferably 10 to 80 micrometers, specifically, for example, 10 micrometers, 15 micrometers, 20 micrometers, 25 micrometers, 30 micrometers, 35 micrometers, 40 micrometers, 45 Micrometer, 50 micrometer, 55 micrometer, 60 micrometer, 65 micrometer, 70 micrometer, 75 micrometer, 80 micrometer, and any range within the range constituted by any two of these point values It may be a value. More preferably, the maximum height difference between the tooth tip and the root of the serrated structure is 15 to 70 micrometers, more preferably 20 to 70 micrometers, and still more preferably 20 to 60 micrometers. It is.

In the first continuous serrated structure, the tooth width (ΔL ₁ ) of the serrated structure is preferably 10 to 80 micrometers, specifically, for example, 10 micrometers, 15 micrometers, and 20 micrometers. Meter, 25 micrometer, 30 micrometer, 35 micrometer, 40 micrometer, 45 micrometer, 50 micrometer, 55 micrometer, 60 micrometer, 65 micrometer, 70 micrometer, 75 micrometer, 80 micrometer, And any value within a range constituted by any two of these point values. More preferably, the tooth width of the serrated structure is 20 to 60 micrometers, and more preferably 20 to 50 micrometers. The tooth width of the serrated structure refers to a horizontal distance between two adjacent tooth bottoms.

In the second continuous serrated structure, the maximum height difference (ΔH ₂ ) between the tooth tip and the tooth bottom is preferably 5 to 15 micrometers, that is, the material of the rust preventive layer 3 is fitted into the magnetically permeable layer 2. The depth is preferably 5 to 15 micrometers, specifically, for example, 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers, 10 micrometers, 11 micrometers, and 12 micrometers. Meter, 13 micrometers, 14 micrometers, 15 micrometers, and any value within a range constituted by any two of these point values may be used. More preferably, the maximum height difference between the tooth tip and the tooth bottom of the serrated structure is 6 to 12 micrometers, and more preferably 8 to 10 micrometers.

In the second continuous serrated structure, the tooth width (ΔL ₂ ) of the serrated structure is preferably 10 to 30 micrometers, specifically, for example, 10 micrometers, 12 micrometers, 14 micrometers. Meter, 16 micrometer, 18 micrometer, 20 micrometer, 22 micrometer, 24 micrometer, 26 micrometer, 28 micrometer, 30 micrometer, and a range constituted by any two of these point values May be an arbitrary value. More preferably, the tooth width of the serrated structure is 12 to 25 micrometers, and more preferably 15 to 25 micrometers. The tooth width of the serrated structure refers to a horizontal distance between two adjacent tooth bottoms.

  In the present invention, the thickness of the magnetically permeable layer 2 may be 0.05 to 1 millimeter, specifically, for example, 0.05 millimeter, 0.08 millimeter, 0.1 millimeter,. 12 millimeters, 0.15 millimeters, 0.18 millimeters, 0.2 millimeters, 0.23 millimeters, 0.25 millimeters, 0.28 millimeters, 0.3 millimeters, 0.31 millimeters, 0.32 millimeters,. 33 millimeters, 0.34 millimeters, 0.35 millimeters, 0.36 millimeters, 0.37 millimeters, 0.38 millimeters, 0.39 millimeters, 0.4 millimeters, 0.41 millimeters, 0.42 millimeters,. 43 millimeters, 0.44 millimeters, 0.45 millimeters, 0. 6 millimeters, 0.47 millimeters, 0.48 millimeters, 0.49 millimeters, 0.5 millimeters, 0.51 millimeters, 0.52 millimeters, 0.53 millimeters, 0.54 millimeters, 0.55 millimeters,. 56mm, 0.57mm, 0.58mm, 0.59mm, 0.6mm, 0.65mm, 0.7mm, 0.8mm, 0.9mm and of these point values It may be an arbitrary value within the range constituted by any two. More preferably, the thickness of the magnetically permeable layer 2 is 0.1 to 0.6 millimeters, and more preferably 0.3 to 0.6 millimeters.

  In the present invention, the formation position of the magnetically permeable layer 2 may be determined by a normal method in this field. For example, the magnetically permeable layer 2 is formed on the bottom of the cooking utensil base 1 or It is formed in the bottom part of the said cookware base | substrate 1, and the side wall adjacent to a bottom part. In a preferred embodiment, the permeable layer 2 is formed on the bottom of the cooking utensil base 1 and the side wall adjacent to the bottom, and the permeable layer formed on the bottom and the permeable layer formed on the side wall are continuous. Constitute the structure. In the preferred embodiment, the height of the magnetically permeable layer formed on the side wall occupies 5% or more of the total height of the cookware base, preferably 10% or more, and more preferably 15% or more. Even more preferably, it is 20% or more, and most preferably 20 to 60%.

  In the present invention, the magnetically permeable layer 2 may be formed of a normal magnetic material in this field. Preferably, the magnetic permeable layer 2 is formed of a magnetic iron alloy. The magnetic iron alloy may be at least one of an Fe—C alloy, an Fe—Si alloy, and an 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 still more preferably. Is 96-98.5 wt%.

  In the present invention, the material of the cooking utensil base 1 may be a normal selection in this field, for example, a normal nonmagnetic material or a material having low magnetic permeability in this field. In one preferred embodiment, in order to obtain an electromagnetic heating effect suitable for the magnetically permeable layer 2, the material of the cookware base 1 is selected from aluminum alloy or 304 stainless steel.

  In the present invention, the binding force between the magnetically permeable layer 2 and the cooking utensil 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. 37MPa, 38MPa, 39MPa, 40MPa, 41MPa, 42MPa, 43MPa, 44MPa, 45MPa, 46MPa, 47MPa, 48MPa, 49MPa, 50MPa, and any value within the range constituted by any two of these point values There may be. Preferably, the coupling force between the magnetically permeable layer 2 and the cooking utensil base 1 is 35 to 50 MPa, and more preferably 37 to 45 MPa. In the present invention, the bonding force between the magnetically permeable layer 2 and the cooking utensil substrate 1 is measured according to the method defined in “Test of tensile bond strength of GB / T 8642-2002 hot spray”.

  In the present invention, the rust prevention layer 3 may cover a part of the magnetically permeable layer 3 or may completely cover the magnetically permeable layer 2. The rust stop layer 3 may have a thickness of 0.02 to 0.08 millimeters, preferably 0.03 to 0.05 millimeters. The rust-preventing layer 3 may be a single layer or a multi-layer structure formed by an ordinary rust-preventing coating material in this field. The rust-preventing coating material may be at least one selected from, for example, a resin composition containing silicon resin, fluororesin, epoxy resin, and aluminum powder or zinc powder. The fluororesin and / or aluminum powder or zinc powder The resin composition containing is preferable.

  In the present invention, the coupling force between the rust preventive layer 3 and the magnetically permeable layer 2 may be 5B. The bonding strength between the rust-preventing layer 3 and the magnetically permeable layer 2 is measured according to the method defined in “GB / T 9286 Paint and Varnish Coating Cross-Cut Test”.

  In the present invention, the electromagnetic heating cooking utensil may be a cooking utensil heated using various ordinary batteries such as an electric pressure cooker, an electric rice cooker, a grill machine, a frying pan, a clay pot, and an electromagnetic cooker. Good.

A method of manufacturing the electromagnetic heating cooker provided by the present invention includes:
(1) By air-powered spray method, the magnetic powder is sprayed on the outer surface of at least a part of the cooking utensil base to form a magnetically permeable layer, and the thickness of the magnetically permeable layer formed is controlled, A serrated structure in which the material of the magnetically permeable layer is fitted into the cookware base with a continuous serrated structure at the interface where the cookware base and the permeable layer are in contact with each other, and is continuous with the surface of the permeable layer. And having a step of having
(2) forming a rust-preventing layer on the magnetically permeable layer.

  In the present invention, the method of forming the magnetically permeable layer is an air-powered spray method and is also called a cold spray method. The magnetically permeable layer formed by the spray method is hardly oxidized, and the magnetic powder collides with the cooking utensil base at a speed close to twice the speed of sound by high-speed air pressure, so that the coating layer has a very high density. Have Furthermore, since the sawtooth structure is formed on the surface of the cooking utensil base by impact, a very strong coupling force is formed between the magnetically permeable layer and the cooking utensil base.

  In the present invention, the thickness of the magnetically permeable layer is preferably 0.3 to 0.6 millimeters. When the thickness of the permeable layer reaches 0.3 to 0.6 mm, the surface roughness value of the permeable layer is maintained at a relatively small value, and a continuous sawtooth structure is formed. Thus, it is ensured that there is a strong bonding force between the rust preventive layer and the magnetically permeable layer.

  In the present invention, in order to form a sawtooth structure having a specific size (i.e., the maximum height difference between the tip and the root and the tooth width) on the cooking utensil base, the particle size of the magnetic powder is preferably It is 10-50 micrometers, More preferably, it is 10-40 micrometers, More preferably, it is 20-40 micrometers. The magnetic powder may be the above-described magnetic iron alloy.

In this invention, the implementation conditions of the said air motive power spray method may include that injection pressure is 1-5 Mpa, injection distance is 10-50 millimeters, and the heating temperature of gas is 200-1000 degreeC. In one preferable embodiment, the operating condition of the air-powered spray method is as follows. The working gas is nitrogen gas, helium gas, or a mixed gas thereof, the injection pressure is 1 to 5 MPa, and the gas heating temperature is 200 to 1000. ° C, gas velocity is 1-2 m ³ / min, powder conveying speed is 5-15 kg / h, spraying distance is 10-50 mm, power consumption is 5-25 kW, powder Including a particle size of 10 to 50 micrometers. With respect to the injection pressure, 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.MPa. 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, It may be an arbitrary value within a range constituted by 5 MPa and any two of these point values. Preferably, the injection pressure is 2 to 4 MPa. In this application, pressure refers to absolute pressure. Regarding the heating temperature of the gas, specifically, for example, 200 ° C, 300 ° C, 400 ° C, 450 ° C, 500 ° C, 550 ° C, 600 ° C, 650 ° C, 700 ° C, 750 ° C, 800 ° C, 850 ° C, It may be an arbitrary value within the range constituted by 900 ° C., 1000 ° C., and any two of these point values. Preferably, the heating temperature of the gas is 500 to 900 ° C, more preferably 600 to 800 ° C. With respect to the spray distance, specifically, any one of 10 millimeters, 15 millimeters, 20 millimeters, 25 millimeters, 30 millimeters, 35 millimeters, 40 millimeters, 45 millimeters, 50 millimeters, and these point values, for example. It may be an arbitrary value within the range constituted by. Preferably, the injection distance is 20 to 50 millimeters, and more preferably 30 to 50 millimeters.

  In the present invention, the method of manufacturing the cooking utensil includes performing deoiling and degreasing treatment on the cooking utensil base before performing cold spraying (ie, air-powered spraying) on the cooking utensil base. It may further include the step of maintaining cleanliness.

According to one preferred embodiment of the present invention, the method of manufacturing the cookware comprises:
(1) performing a deoiling and degreasing process on the surface of the cooking utensil substrate, and maintaining the cleanliness of the surface;
(2) The air-powered spraying method is used to spray the magnetic powder onto at least a part of the outer surface (preferably the bottom or the bottom and the side wall) of the cooking utensil substrate treated in step (1). Forming a 0.3-0.6 mm permeable layer;
(3) After performing a deoiling and degreasing process with respect to the cooking appliance base | substrate with which the magnetic permeability layer was formed, the step which sprays a rust prevention protective coating layer on a magnetic permeability layer is included.

  Hereinafter, the utility model will be described in more detail with reference to Examples and Comparative Examples.

Examples 1-6
The surface of the cooking utensil substrate is deoiled and degreased to maintain the cleanliness of the surface. The magnetic powder is sprayed on the bottom of the cooking utensil base using an air power spray method to form a magnetically permeable layer. After performing a deoiling and degreasing process with respect to the cookware base | substrate with which the magnetic permeability layer was formed, a rust prevention protective coating layer is sprayed on a magnetic permeability layer. Here, implementation conditions and magnetic powder in the air-powered spray process are as shown in Table 1. The tooth width (ΔL ₁ ) of the saw-tooth structure formed at the contact interface between the magnetically permeable layer and the cookware base with reference to “GB / T 15748-1995 Quantitative Metal Structure Manual Measurement Method”, and teeth Maximum altitude difference between tip and root (ΔH ₁ ), tooth width (ΔL ₂ ) of serrated structure formed at contact interface between rust preventive layer and magnetically permeable layer, and tip and root of tooth And the maximum height difference (ΔH ₂ ) is detected. According to the method specified in “GB / T 8642-2002 Hot Spray Tensile Bond Strength Test”, the bonding force between the magnetically permeable layer and the cookware substrate is detected, and “GB / T 9286 paint and varnish coating” are detected. The bonding force between the rust preventive layer and the magnetically permeable layer is detected according to the method prescribed in “Crosscut Test of Film”. The detection results are as shown in Table 2.

Comparative Example 1
A cooking utensil is manufactured according to the method of Example 6, but the difference is that a hot spray method is employed in the spray process for forming the magnetically permeable layer. According to the method specified in “GB / T 8642-2002 Hot Spray Tensile Bond Strength Test”, the bonding force between the magnetically permeable layer and the cookware substrate is detected, and “GB / T 9286 paint and varnish application” are detected. The bonding force between the rust preventive layer and the magnetically permeable layer is detected according to the method prescribed in “Crosscut Test of Film”. The detection results are as shown in Table 2.

  As can be seen from the data in Table 2 above, in the cooking utensil manufactured according to the method of the present invention, a strong binding force is present between the permeable layer and the cooking utensil base, and the rust-preventing layer and the permeable layer. Have.

  As mentioned above, although preferred embodiment of this invention was described in detail according to drawing, this invention is not limited to the specific detail of the said embodiment. Within the scope of the technical idea of the present invention, a plurality of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

  The specific technical features described in the specific embodiments can be combined by any suitable method as long as no contradiction arises. In order to avoid unnecessary duplication, the present invention does not separately describe various combinable schemes.

  Moreover, arbitrary combinations can be made between various different embodiments of the present invention, and should be regarded as the contents disclosed in the present invention as long as they are not contrary to the idea of the present invention.

1: Cooking utensil substrate 2: Magnetically permeable layer 3: Rust prevention layer

Claims (13)

A cooking utensil for electromagnetic heating,
The cooking utensil includes a cooking utensil base 1 and a magnetically permeable layer 2 formed on at least a part of the outer surface of the cooking utensil base 1.
At the interface where the cooking utensil base 1 and the magnetic permeable layer 2 are in contact with each other, the material of the magnetic permeable layer 2 is fitted into the cooking utensil base 1 with a first continuous serrated structure,
A cooking utensil for electromagnetic heating. The cooking utensil further includes a rust preventing layer 3 formed on at least a part of the surface of the magnetically permeable layer 2,
At the interface where the magnetic permeable layer 2 and the rust preventive layer 3 are in contact, the material of the rust preventive layer 3 is fitted into the magnetic permeable layer 2 with a second continuous sawtooth structure,
The cooking utensil according to claim 1. A maximum height difference between a tooth tip and a root in the first continuous serrated structure is greater than a maximum height difference between a tooth tip and a root in the second continuous saw tooth structure;
The cooking utensil according to claim 2. In the first continuous serrated structure, the maximum height difference between the tooth tip and the tooth bottom is 10 to 80 micrometers, and the tooth width is 10 to 80 micrometers.
The cooking utensil according to claim 1. In the second continuous serrated structure, the maximum height difference between the tooth tip and the tooth bottom is 5 to 15 micrometers, and the tooth width is 10 to 30 micrometers.
The cooking utensil according to claim 2. The thickness of the magnetically permeable layer 2 is 0.1 to 0.6 mm.
The cooking utensil according to claim 1. The magnetic permeable layer 2 and the rust preventive layer 3 are formed on the bottom of the cooking utensil base 1 or formed on the bottom of the cooking utensil base 1 and a side wall adjacent to the bottom.
The cooking utensil according to claim 2. The magnetically permeable layer 2 is formed of a magnetic iron alloy,
Preferably, the magnetic iron alloy is at least one of an Fe-C alloy, an Fe-Si alloy, and an Fe-Mn alloy, and the Fe content in the magnetic iron alloy is 95 wt% or more. ,
The cooking utensil according to claim 1. The material of the cooking utensil base 1 is a non-magnetic material or a material with low magnetic permeability, preferably aluminum alloy or 304 stainless steel.
The cooking utensil according to claim 1. A method for producing the cooking utensil according to any one of claims 1 to 9, wherein the method comprises:
(1) By air-powered spray method, the magnetic powder is sprayed on the outer surface of at least a part of the cooking utensil base to form a magnetically permeable layer, and the thickness of the magnetically permeable layer formed is controlled, A serrated structure in which the material of the magnetically permeable layer is fitted into the cookware base with a continuous serrated structure at the interface where the cookware base and the permeable layer are in contact with each other, and is continuous with the surface of the permeable layer. And having a step of having
(2) forming a rust-preventing layer on the magnetically permeable layer,
A method characterized by that. The thickness of the magnetically permeable layer is 0.1 to 0.6 mm.
The method according to claim 10. The magnetic powder has a particle size of 10 to 50 micrometers,
The method according to claim 10. The implementation conditions of the aerodynamic spray method are as follows: injection pressure is 1 to 5 MPa, injection distance is 10 to 50 millimeters, and gas heating temperature is 200 to 1000 ° C.,
The method according to claim 10.

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