JP2020093168A - Cooking implement for electromagnetic heating and manufacturing method of the same - Google Patents

Abstract

To provide a cooking implement for electromagnetic heating, an implement that enhances binding power between a magnetic permeability layer and a cooking implement substrate and between an anticorrosive layer and the magnetic permeability layer in the cooking implement for electromagnetic heating, and also to provide a manufacturing method of the implement.SOLUTION: The cooking implement for electromagnetic heating of the embodiment includes: a cooking implement substrate 1; a magnetic permeability layer 2 that is formed at least on a part of an external surface of the cooking implement substrate 1; and an anticorrosive layer 3 that is formed at least on a part of a surface of the magnetic permeability layer 2. In the boundary surface in which the cooking implement substrate 1 and the magnetic permeability layer 2 are in contact with each other, the material of the magnetic permeability layer 2 is fitted in a first continuous serrated structure into the cooking implement substrate 1. In the boundary surface in which the magnetic permeability layer 2 and the anticorrosive layer 3 are in contact with each other, the material of the anticorrosive layer 3 is fitted in a second continuous serrated structure into the magnetic permeability layer 2. The roughness formed by the first continuous serrated structure is larger than that formed by the second continuous serrated structure.SELECTED DRAWING: Figure 2

Description

The present invention relates to the field of cookware, and more particularly to cookware for electromagnetic heating and methods of making the same.

Materials such as aluminum alloy and 304 stainless steel are very widely used for home electric appliances, but these non-magnetic materials or pots with low magnetic permeability do not have an ideal electromagnetic heating function. The conventional process of IH inner pot is mainly adopting the method of explosive welding or pressure welding to trowel a thin plate of 430 stainless steel on the surface of the aluminum alloy, and the magnetic 430 stainless steel on the outer surface of the pot fixture has high frequency. Induction heating is performed by the eddy current effect formed by the action of the alternating magnetic field. However, the steps in this process are relatively complex and relatively expensive. Also, a magnetically permeable metal layer may be produced on the bottom of the pan by a method such as hot spraying, eg arc or plasma spraying, to realize the electromagnetic heating function of these pan appliances. 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 the iron powder is in a molten or semi-molten state and collides with the base surface of the pan appliance at a relatively low atmospheric pressure. 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 to 8 μm). Since it is difficult to fit into the base body, the bonding strength between the hot-sprayed iron layer and the base body of the aluminum alloy pot device is relatively poor. In addition, when the hot-sprayed permeable layer increases to a certain thickness (for example, 0.3 to 0.6 mm), its surface roughness obviously increases (for example, 20 to 60 μm), The bond strength of the rust preventive layer sprayed on the surface is clearly reduced.

SUMMARY OF THE INVENTION In order to overcome the deficiency of the relatively poor bonding force between the magnetic permeable layer and the cookware base, and between the rust preventive layer and the magnetic permeable layer in conventional cookware for electromagnetic heating, the present invention provides an electromagnetic wave. An object of the present invention is to provide a cooking utensil for heating and a manufacturing method thereof.

To achieve the above object, one aspect of the present invention provides a cooking utensil for electromagnetic heating. The cookware includes a cookware base, a magnetic permeable layer formed on an outer surface of at least a part of the cookware base, and a rust preventive layer formed on at least a surface of the magnetic permeable layer, At the interface where the cookware base and the magnetic permeability layer contact, the material of the magnetic permeability layer is fitted into the cookware base in a first continuous sawtooth structure, and the magnetic permeability layer and the rust preventive layer At the interface of contact, the material of the anticorrosion layer is embedded in the magnetically permeable layer in a second continuous sawtooth structure. The roughness formed by the first continuous sawtooth structure is greater than the roughness formed by the second continuous sawtooth structure.

Preferably, the magnetic permeable layer is formed by a cold spray method.

Preferably, the maximum difference in height between the addendum and the root in the first continuous sawtooth structure is larger than the maximum difference in height between the addendum and the root in the second continuous sawtooth structure.

Preferably, in the first continuous saw-toothed 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.

Preferably, the magnetic permeability layer has a thickness of 0.1 to 0.6 mm.

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

The material of the cooking utensil substrate is preferably a non-magnetic material or a material having a low magnetic permeability, and is preferably an aluminum alloy or 304 stainless steel.

Another aspect of the present invention provides a method of manufacturing the cookware for electromagnetic heating. The method is
(1) Degreasing and degreasing the surface of the cookware base;
(2) The magnetic powder is sprayed onto the outer surface of at least a part of the cookware base to form a magnetic permeable layer, and the thickness of the magnetic permeable layer is controlled to control the cookware base and the cookware base. At the interface with the magnetically permeable layer, the material of the magnetically permeable layer is fitted into the cookware substrate in a first continuous sawtooth structure and a second continuous sawtooth structure is provided on the surface of the magnetically permeable layer. To have
(3) degreasing and degreasing the cookware substrate having the magnetically permeable layer, and then forming a rust preventive layer on the magnetically permeable layer.
The roughness formed by the first continuous sawtooth structure is greater than the roughness formed by the second continuous sawtooth structure.

Preferably, the magnetic powder is sprayed onto at least a part of the outer surface of the cookware substrate by a cold spray method to form the magnetic permeable layer.

Preferably, the thickness of the magnetically permeable layer is 0.1 to 0.6 mm. Further, the particle size of the magnetic powder is preferably 10 to 50 micrometers.

Preferably, the cold spray method is performed under the following conditions: an injection pressure of 1 to 5 MPa, an injection distance of 10 to 50 mm, and a gas heating temperature of 200 to 1000°C.

According to the cookware for electromagnetic heating provided by the present invention, the binding force between the magnetic permeable layer and the cookware base and the rust preventive layer and the magnetic permeable layer in the cookware for electromagnetic heating is enhanced. be able to.

Further, according to the method for manufacturing a cooking utensil for electromagnetic heating provided by the present invention, the electromagnetic heating having a high bonding force between the magnetic permeability layer and the cooking utensil base and between the rust preventive layer and the magnetic permeability layer. Cookware can be manufactured.

FIG. 1 is a partial structural schematic view 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. FIG. 3 is a partially enlarged schematic view of a contact interface between the magnetically permeable layer and the cookware substrate shown in FIG. 2. FIG. 4 is a partially enlarged schematic view of a contact interface between the rust preventive layer and the magnetic permeable layer shown in FIG.

In the present invention, unless otherwise contradictory, the term of orientation used, for example, "upper, lower" refers to the upper and lower shown in the drawings, and "inside, outside" refers to the inside of each part itself, Points outside.

As shown in FIGS. 1 to 4, a cookware for electromagnetic heating according to the present invention includes a cookware base 1, a magnetic permeable layer 2 formed on an outer surface of at least a part of the cookware base 1, and A rust preventive layer 3 formed on at least a part of the surface of the magnetic permeable layer 2, and the material of the magnetic permeable layer 2 is the first at the interface where the cookware base 1 and the magnetic permeable layer 2 contact each other. Of the rust preventive layer 3 is fitted in the cookware base 1 in a continuous sawtooth structure, and the material of the rust preventive layer 3 has a second continuous sawtooth structure at an interface where the magnetic permeability layer 2 and the rust preventive layer 3 contact each other. It is fitted into the magnetic permeable layer 2.

In the term "continuous sawtooth structure", "sequential" means that the saw teeth of the sawtooth structure are arranged continuously, and there is almost a platform (ie, layer) between two adjacent saw teeth. It means not doing. 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 tip and the root in the first continuous sawtooth structure is larger than the maximum height difference between the tip and the root in the second continuous sawtooth structure, that is, The roughness formed by the first continuous sawtooth structure is greater than the roughness formed by the second continuous sawtooth structure.

In the first continuous sawtooth structure, the maximum height difference (ΔH ₁ ) between the tooth tip and the tooth bottom is preferably 10 to 80 μm, that is, the material of the magnetic permeable layer 2 is applied to the cookware substrate 1. The depth to be fitted is preferably 10 to 80 micrometers, and 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 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 top and the tooth bottom of the saw-toothed structure is 15 to 70 micrometers, more preferably 20 to 70 micrometers, and even more preferably 20 to 60 micrometers. Is.

In the first continuous sawtooth structure, the tooth width (ΔL ₁ ) of the sawtooth structure is preferably 10 to 80 μm, and specifically, for example, 10 μm, 15 μm, 20 μm. Meters, 25 micrometers, 30 micrometers, 35 micrometers, 40 micrometers, 45 micrometers, 50 micrometers, 55 micrometers, 60 micrometers, 65 micrometers, 70 micrometers, 75 micrometers, 80 micrometers, Also, it may be an arbitrary value within a range constituted by any two of these point values. More preferably, the tooth width of the saw-toothed structure is 20 to 60 micrometers, and more preferably 20 to 50 micrometers. The tooth width of the sawtooth structure refers to a horizontal distance between two adjacent roots.

In the second continuous sawtooth structure, the maximum height difference (ΔH ₂ ) between the tooth tip and the tooth bottom is preferably 5 to 15 μm, that is, the material of the rust preventive layer 3 is embedded in the magnetic permeable layer 2. The depth to be provided is preferably 5 to 15 micrometers, and specifically, for example, 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers, 10 micrometers, 11 micrometers, 12 micrometers. It may be an arbitrary value within a range constituted by any of meters, 13 micrometers, 14 micrometers, 15 micrometers, and any two of these point values. More preferably, the maximum height difference between the tooth top and the tooth bottom of the saw-toothed structure is 6 to 12 μm, and more preferably 8 to 10 μm.

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

In the present invention, the thickness of the magnetic permeable layer 2 may be 0.05 to 1 mm, and specifically, for example, 0.05 mm, 0.08 mm, 0.1 mm, 0. 12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.23 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.31 mm, 0.32 mm, 0. 33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.4 mm, 0.41 mm, 0.42 mm, 0. 43 mm, 0.44 mm, 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, 0.49 mm, 0.5 mm, 0.51 mm, 0.52 mm, 0. 53 mm, 0.54 mm, 0.55 mm, 0.56 mm, 0.57 mm, 0.58 mm, 0.59 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0. It may be any value within the range constituted by 8 mm, 0.9 mm, and any two of these point values. More preferably, the magnetic permeable layer 2 has a thickness of 0.1 to 0.6 mm, and more preferably 0.3 to 0.6 mm.

In the present invention, the formation position of the magnetic permeable layer 2 may be determined by a conventional method in the field, for example, the magnetic permeable layer 2 is formed on the bottom of the cookware base 1, or It is formed on the bottom of the cookware base 1 and a sidewall adjacent to the bottom. In a preferred embodiment, the magnetic permeable layer 2 is formed on the bottom of the cookware base 1 and a sidewall adjacent to the bottom, and the magnetic permeable layer formed on the bottom and the magnetic permeable layer formed on the sidewall are continuous. To make up the structure. In the above preferred embodiment, the height of the magnetic 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 20% or more, and most preferably 20 to 60%.

In the present invention, the magnetic permeable layer 2 may be formed of a magnetic material that is common in this field. Preferably, the magnetic permeable layer 2 is made 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 further preferably Is 96-98.5% by weight.

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

In the present invention, the binding force between the magnetic permeable layer 2 and the cooking utensil substrate 1 may be 30 to 50 MPa, and 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 a range constituted by any two of these point values. It may be. Preferably, the binding force between the magnetic permeable layer 2 and the cookware base 1 is 35 to 50 MPa, and more preferably 37 to 45 MPa. In the present invention, the bond strength between the magnetic permeable layer 2 and the cookware substrate 1 is measured according to the method defined in "GB/T 8642-2002 Hot Spray Tensile Bond Strength Test".

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

In the present invention, the binding force between the rust preventive layer 3 and the magnetic permeable layer 2 may be 5B. The bond strength between the rust preventive layer 3 and the magnetic permeable layer 2 is measured according to the method specified in "GB/T 9286 Paint and varnish coating cross-cut test".

In the present invention, the cookware for electromagnetic heating may be cookware that uses various ordinary electromagnetic waves such as an electric pressure cooker, an electric rice cooker, a grill machine, a frying pan, a clay pot, and an electromagnetic cooker. Good.

The method for manufacturing the cookware for electromagnetic heating provided by the present invention,
(1) The magnetic powder is sprayed onto at least a part of the outer surface of the cookware base by an air-powered spray method to form a magnetic permeable layer, and the thickness of the magnetic permeable layer is controlled to control the thickness of the magnetic permeable layer. At the interface where the cookware base and the magnetic permeable layer contact, the material of the magnetic permeable layer is fitted into the cookware base in a continuous sawtooth structure, and a sawtooth structure continuous to the surface of the magnetic permeable layer is formed. A step of having
(2) a step of forming a rust preventive layer on the magnetic 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 cookware substrate at a speed close to twice the speed of sound due to high-speed air pressure, so that the coating layer has a very high compactness. Have. In addition, the impact creates a sawtooth structure on the surface of the cookware substrate, which creates a very strong bond between the magnetically permeable layer and the cookware substrate.

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

In the present invention, in order to form a sawtooth structure having a specific size (that is, the maximum height difference between the tip and the bottom and the tooth width) on the cookware base, the particle size of the magnetic powder is preferably It is 10 to 50 micrometers, more preferably 10 to 40 micrometers, and further preferably 20 to 40 micrometers. The magnetic powder may be the magnetic iron alloy described above.

In the present invention, the conditions for performing the air-powered spray method may include that the injection pressure is 1 to 5 MPa, the injection distance is 10 to 50 mm, and the heating temperature of the gas is 200 to 1000°C. In one preferable embodiment, the operating conditions of the air-powered spray method are that the working gas is nitrogen gas, helium gas or a mixed gas of both, the injection pressure is 1 to 5 MPa, and the heating temperature of the gas is 200 to 1000. ℃, gas velocity is 1-2 m ³ /min, powder conveying speed is 5-15 kg/h, injection distance is 10-50 mm, power consumption is 5-25 kW, powder Particle size of 10 to 50 micrometers is included. Regarding 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. 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 a range constituted by 900° C., 1000° C., and any two of these point values. The heating temperature of the gas is preferably 500 to 900°C, more preferably 600 to 800°C. Regarding the injection distance, specifically, for example, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, and any two of these point values. It may be an arbitrary value within the range constituted by. Preferably, the injection distance is 20 to 50 millimeters, more preferably 30 to 50 millimeters.

In the present invention, the method for manufacturing the cooking utensil comprises performing deoiling and degreasing treatment on the cooking utensil substrate before cold spraying (that is, air-powered spray) to the cooking utensil substrate, 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) a step of degreasing and degreasing the surface of the cooking utensil substrate to maintain the cleanliness of the surface;
(2) An air-powered spray method is used to spray the magnetic powder onto at least a portion of the outer surface of the cookware substrate treated in step (1) (preferably at the bottom, or bottom and sidewalls) to provide the cookware substrate. Forming a magnetically permeable layer of 0.3 to 0.6 millimeters;
(3) Degreasing and degreasing the cookware substrate on which the magnetic permeable layer is formed, and then spraying a rust preventive protective coating layer on the magnetic permeable layer.

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

Examples 1-6
Degreasing and degreasing treatments are performed on the surface of the cookware substrate to maintain the cleanliness of the surface. The magnetic powder is sprayed onto the bottom of the cookware substrate using an air-powered spray method to form a magnetically permeable layer. After degreasing and degreasing the cookware substrate on which the magnetic permeability layer is formed, a rust preventive protective coating layer is sprayed on the magnetic permeability layer. Here, the operating conditions and magnetic powder in the air-powered spray process are as shown in Table 1. Referring to "GB/T 15749-1995 Quantitative Metallurgical Manual Measurement Method", the tooth width (ΔL1) of the sawtooth structure formed at the contact interface between the magnetically permeable layer and the cookware substrate, and the tooth tip. Height difference (ΔH1) between the rust preventive layer and the tooth bottom, the tooth width (ΔL2) of the sawtooth structure formed at the contact interface between the rust preventive layer and the magnetic permeable layer, and the maximum difference between the tip and the tooth bottom. The altitude difference (ΔH2) is detected. The bond strength between the magnetically permeable layer and the cookware substrate was detected according to the method specified in "GB/T 8642-2002 Hot Spray Tensile Bond Strength Test" to determine the "GB/T 9286 paint and varnish application". The binding force between the rust preventive layer and the magnetic permeable layer is detected according to the method specified in "Cross-Cut Test of Membrane". The detection results are as shown in Table 2.

Comparative Example 1
The cookware is manufactured according to the method of Example 6, except that the method of hot spraying is adopted in the spraying process for forming the magnetic permeable layer. The bond strength between the magnetically permeable layer and the cookware substrate was detected according to the method specified in "GB/T 8642-2002 Hot Spray Tensile Bond Strength Test" to determine "GB/T 9286 paint and varnish application". The binding force between the rust preventive layer and the magnetic permeable layer is detected according to the method specified in "Cross-Cut Test of Membrane". The detection results are as shown in Table 2.

As can be seen from the data in Table 2 above, in the cookware manufactured according to the method of the present invention, a strong bonding force is exerted between the magnetic permeable layer and the cookware base, and between the rust preventive layer and the magnetic permeable layer. Have.

Although the preferred embodiments of the present invention have been described above in detail with reference to the drawings, the present invention is not limited to the specific details of the above embodiments. 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 all these simple modifications belong to the protection scope of the present invention.

Note that the specific technical features described in the specific embodiments can be combined in any suitable manner as long as there is no contradiction. In order to avoid unnecessary duplication, the present invention does not separately describe various combinable schemes.

Further, 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 do not violate the concept of the present invention.

1: Cookware substrate 2: Magnetic permeability layer 3: Rust prevention layer

Claims (7)

A cooking utensil for electromagnetic heating,
The cookware includes a cookware base 1, a magnetic permeability layer 2 formed on an outer surface of at least a portion of the cookware base 1, and a rust preventive layer formed on at least a surface of the magnetic permeability layer 2. Including 3 and
At the interface where the cookware base 1 and the magnetic permeable layer 2 contact, the material of the magnetic permeable layer 2 is fitted into the cookware base 1 in a first continuous sawtooth structure,
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 in a second continuous sawtooth structure.
The roughness formed by the first continuous sawtooth structure is greater than the roughness formed by the second continuous sawtooth structure,
Cooking utensils characterized by that. The magnetic permeable layer 2 is formed by a cold spray method,
The cooking utensil according to claim 1. The maximum height difference between the tip and the bottom in the first continuous sawtooth structure is larger than the maximum difference in height between the tip and the bottom in the second continuous sawtooth structure,
In the first continuous sawtooth structure, the maximum height difference between the tooth tip and the tooth bottom is 10 to 80 μm, and the tooth width is 10 to 80 μm.
The cooking utensil according to claim 1 or 2, characterized in that. The magnetic permeable layer 2 has a thickness of 0.1 to 0.6 mm,
The cooking utensil according to any one of claims 1 to 3, which is characterized by the above. The magnetic permeable layer 2 is formed of a magnetic iron alloy,
Preferably, 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 wt% or more. ,
The material of the cooking utensil base 1 is a non-magnetic material or a material with low magnetic permeability, and is preferably an aluminum alloy or 304 stainless steel.
The cooking utensil according to any one of claims 1 to 4, characterized in that. A method for manufacturing the cooking utensil according to any one of claims 1 to 5, wherein the method comprises:
(1) Degreasing and degreasing the surface of the cookware base;
(2) The magnetic powder is sprayed onto the outer surface of at least a part of the cookware base to form a magnetic permeable layer, and the thickness of the magnetic permeable layer is controlled to control the cookware base and the cookware base. At the interface with the magnetically permeable layer, the material of the magnetically permeable layer is fitted into the cookware substrate in a first continuous sawtooth structure and a second continuous sawtooth structure is provided on the surface of the magnetically permeable layer. To have
(3) degreasing and degreasing the cookware substrate having the magnetically permeable layer, and then forming a rust preventive layer on the magnetically permeable layer.
The roughness formed by the first continuous sawtooth structure is greater than the roughness formed by the second continuous sawtooth structure,
A method characterized by the following. By a cold spray method, the magnetic powder is sprayed onto the outer surface of at least a portion of the cookware substrate to form the magnetically permeable layer,
The thickness of the magnetically permeable layer is 0.1 to 0.6 mm,
The particle size of the magnetic powder is 10 to 50 micrometers,
The cold spray method is performed under the following conditions: injection pressure is 1 to 5 MPa, injection distance is 10 to 50 mm, and gas heating temperature is 200 to 1000° C.
7. The method according to claim 6, characterized in that