JPH11185945A - Cookware for electromagnetic induction heating cookwear and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety, ease of use, and daily care property by using a magnetic metal material having a predetermined Curie temperature on a rear surface of a cookwear, spraying in a vacuum or inert gas atmosphere to form a heat generation layer, and making an oxygen content thereof below a specific amount. SOLUTION: A heat generation layer 3 is formed by spraying a temperature sensing magnetic metal on a rear surface of a bottom part of a cookwear 1 like a frying pan which is made of aluminum alloy by an arc spraying method. In this case, a Curie temperature of the temperature sensing magnetic metal is, for example, 240 deg.C. Moreover, an oxygen content of the heat generation layer 3 after spraying is within 0 to 10 wt.%. As a result, a magnetic metal material which excels in safety and has a predetermined Curie temperature is oxidized during spraying, and a composition of the heat generation layer after spraying differs from that of the heat generation layer before spraying, thereby solving a problem of changes of Curie temperature. Even if constituent components of the magnetic metal material after spraying are oxidized, it is possible to form many kinds of heat generation layers having different Curie temperatures due to the adjustment of a degree of oxidation and spray conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking appliance for an electromagnetic induction heating cooker having a self-temperature control function, in particular, to prevent burns during use, smoke during cooking and ignition, and to provide a highly safe cooking product. The present invention relates to a cooker for an electromagnetic induction heating cooker and a method for producing the cooker, which suppresses excessive scorching and sticking and has good maintainability.

[0002]

2. Description of the Related Art Conventionally, the following cooking utensils have been used for electromagnetic induction heating cookers. For example, a magnetic metal material such as iron or stainless steel, or a magnetic metal material and a nonmagnetic metal material of aluminum processed as two or three layers and a clad material, and a nonmagnetic metal material such as aluminum or ceramics There is a method in which a magnetic metal material such as iron or stainless steel is brazed to the back surface of a cooking container using the material, and is integrated by a method such as pressure welding, molten metal forging, or thermal spraying. In the above-mentioned cooking containers, those prepared by processing magnetic metal materials such as iron and stainless steel are inexpensive and often used.

Recently, a magnetic metal material such as iron or stainless steel has been pressed against the back of a cooking container using a non-magnetic metal material such as aluminum or a ceramic material, or
Many are integrated by a method such as thermal spraying, and some cooking surfaces are provided with irregularities such as dimple processing in order to reduce the contact area with the food.

[0004] In particular, a cooking container using an aluminum die-cast product is often used because it is inexpensive, can be processed into various shapes, and is lightweight. Most of the cooking surfaces of the above-mentioned cooking containers are coated with a heat-resistant coating or a fluororesin for suppressing sticking or the like.

[0005]

However, in the conventional temperature control of the cooking utensil for the electromagnetic induction heating cooker, the temperature of the bottom surface of the cooking utensil is detected by a thermistor installed on the back surface of a ceramic top plate having poor heat conduction. However, since the temperature of the cooking surface is controlled, a large difference occurs between the temperature detected by the thermistor on the main body and the temperature of the cooking surface, and it is difficult to accurately determine the temperature of the heating setting. In particular, when the bottom surface of the cooking utensil to be used is significantly warped or deformed, the above tendency is more remarkably observed and becomes more difficult.

For this reason, for example, when frying with a small amount of oil using a frying pan, the difference between the set temperature of the electromagnetic induction heating cooker body and the oil temperature becomes large, and the fire does not reach the inside. Fried or fired when heating with thin oil such as stir fry,
At the time of preheating, there was also a problem in terms of usability, such as putting foods and scorching without knowing that the temperature was too high.

[0007] Also, for cooking utensils that can be used in a conventional electromagnetic induction heating cooker, in which a heat-resistant coating or a non-adhesive layer containing a fluororesin as a main component is formed, the electromagnetic induction heating cooker body has the above structure. If the warpage or deformation is large, the temperature of the cooking surface will rise above the heat-resistant temperature of the heat-resistant coating or the non-adhesive layer containing fluororesin as a main component, and the painted surface and the non-adhesive layer will peel off. There was a problem with the durability.

[0008] As a result, there has been a problem in the careability such as sticking. In particular, there was hardly any cookware having a non-adhesive layer that can be used with confidence in an electromagnetic induction heating cooker capable of obtaining a high heating power of 2 kW or more.

Accordingly, the present inventors have developed a cooking utensil for an electromagnetic induction heating cooker in which a heating layer made of a magnetic metal material having a predetermined Curie temperature is formed on at least the bottom surface of a metal or non-metal cooking vessel. The present invention proposes an invention in which the temperature of the cooking surface does not rise above a certain temperature by using the Curie temperature. In particular, the durability of a non-adhesive layer containing a fluororesin as a main component formed on the inner surface of a cooking vessel has been improved, and a cooking appliance excellent in safety, ease of use, and maintainability has been proposed.

Further, by forming a rust preventive layer or a coating layer outside the heat generating layer, the corrosion resistance has been improved, and the life as a cooking appliance for an electromagnetic induction heating cooker has also been improved.

Further, depending on the method of integrating a heat generating layer made of a magnetic metal material having a predetermined Curie temperature on the bottom surface of the cooking vessel, there is a problem in durability regarding joining such that the heat generating layer floats or peels off from the cooking vessel during use. However, the above problem could be suppressed by proposing a thermal spraying method as an integration method. However, since the integration method is performed in the air, a magnetic metal material having a predetermined Curie temperature is oxidized during thermal spraying, and the composition of the heat generating layer after thermal spraying is different from the composition of the heat generating layer before thermal spraying. Was changed.

Further, in order to manufacture a number of types of cooking utensils for an electromagnetic induction heating cooker having a heating layer having different Curie temperatures, several types of magnetic metal materials having different Curie temperatures are required, which increases costs. There were also problems.

Accordingly, an object of the present invention is to provide a cooking apparatus for an electromagnetic induction heating cooker which is excellent in safety, ease of use and maintenance, and to provide a cooking apparatus for an electromagnetic induction heating cooker for more reliably achieving the above object. A method of manufacturing a device is provided.

[0014]

In order to solve the above-mentioned problems, the present invention provides a heat-generating layer made of a magnetic metal material having a predetermined Curie temperature on the back surface of a cooking utensil, wherein the heat-generating layer has an oxygen content of 10 wt. % Or less as a cooking appliance for an electromagnetic induction heating cooker.

[0015] Further, the present invention relates to a cooking utensil for an electromagnetic induction heating cooker in which a heat generating layer is formed on the back surface of the cooking utensil by performing thermal spraying in a vacuum or an inert gas atmosphere using a magnetic metal material having a predetermined Curie temperature. It is a manufacturing method.

[0016]

According to the first aspect of the present invention, a heating layer made of a magnetic metal material having a predetermined Curie temperature is provided on the back surface of a cooking utensil, and the oxygen content of the heating layer is reduced to 10 wt%.
It is intended to be a cooking utensil for an electromagnetic induction heating cooker as described below, whereby when a number of types of cooking utensils for an electromagnetic induction heating cooker having heating layers with different Curie temperatures are manufactured, a certain Curie temperature Can be obtained with one temperature-sensitive magnetic metal.

According to a second aspect of the present invention, there is provided an electromagnetic induction heating cooker in which a heating layer made of a magnetic metal material having a predetermined Curie temperature is provided on the back surface of the cooking utensil, and the heating layer has an oxygen content of 0 wt%. It is a cooking utensil, and can be reliably obtained from one temperature-sensitive magnetic metal having a specific Curie temperature.

According to a third aspect of the present invention, there is provided an electromagnetic induction heating method in which a magnetic metal material having a predetermined Curie temperature is sprayed in a vacuum or an inert gas atmosphere to form a heat generating layer on the back surface of the cooking utensil. It is intended to be a method of manufacturing cookware for cookers, and by using this method,
It is possible to further suppress phenomena such as a change in Curie temperature and a decrease in bonding strength, which are observed by conventional methods such as cladding, brazing, pressure welding, and forging.

According to a fourth aspect of the present invention, a heat generating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal spray material made of a magnetic metal material having a predetermined Curie temperature,
By adjusting the oxygen content of the heating layer, a method for manufacturing a cookware for an electromagnetic induction heating cooker in which the Curie temperature of the formed heating layer is variable,
In addition to being excellent in safety, ease of use and maintenance, the magnetic metal material having a predetermined Curie temperature is oxidized during thermal spraying, and the composition of the heat generating layer after thermal spraying is different from the composition of the heat generating layer before thermal spraying. Can be solved.Even if the components of the magnetic metal material having a predetermined Curie temperature after the thermal spraying are oxidized, by adjusting the degree of oxidation and the thermal spraying conditions, It is possible to provide a cooking utensil for an electromagnetic induction heating cooker capable of forming several types of heat generating layers having a different Curie temperature, and a method for manufacturing the same.

According to a fifth aspect of the present invention, a heat generating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal spray material made of a magnetic metal material having a predetermined Curie temperature,
The present invention provides a method of manufacturing a cooking utensil for an electromagnetic induction heating cooker in which the Curie temperature of a heat generating layer to be formed is made variable by adjusting the thickness of the heat generating layer.

According to a sixth aspect of the present invention, a heat generating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal spray material made of a magnetic metal material having a predetermined Curie temperature,
A method for manufacturing a cooking utensil for an electromagnetic induction heating cooker in which a Curie temperature of a heat generating layer to be formed is made variable by adjusting a voltage applied to a thermal spray material required for forming the heat generating layer. .

The present invention uses a temperature-sensitive magnetic metal which loses magnetism when the temperature exceeds a predetermined Curie temperature, as the magnetic metal material of the heat generating layer. For this reason, when the temperature-sensitive magnetic metal is heated from room temperature by an electromagnetic induction heating cooker, large power consumption is obtained and heated as in the case of conventional iron and stainless steel until the Curie temperature is reached, but the Curie temperature , The magnetic properties change and heating is stopped as in the case of aluminum and copper, and the power consumption sharply decreases. At this time, if the temperature of the temperature-sensitive magnetic metal is slightly lower than the Curie temperature, it is heated again. Since the above state repeatedly operates at the Curie temperature, the cooking appliance itself has a self-temperature control function. Therefore, development to various cooking utensils can be considered depending on how many times the Curie temperature is set. For example, when frying in a tempura pan using a temperature-sensitive magnetic metal having a Curie temperature of 210 ° C. for the heat generating layer, the oil temperature does not exceed 210 ° C. and the oil does not ignite. In addition, if the food is stir-fried in a frying pan using 240 ° C., smoke and ignition as well as over-burning of the cooked food can be suppressed. Further, if the food is boiled in a pot using a temperature of 140 ° C., it is possible to prevent the food from sticking or sticking to the bottom of the pot. By using a cooking utensil for an electromagnetic induction heating cooker having a temperature-sensitive magnetic metal as a heat generating layer in this manner, safety, usability, and careability are excellent.

On the other hand, in the present invention, the oxygen content of the heating layer made of a magnetic metal material having a predetermined Curie temperature is set to 0 to 1
It is proposed that the oxygen content be within 0% by weight even if the heating layer formed by this is oxidized.
%, The predetermined Curie temperature does not change before and after the formation of the heat generating layer. However, the term “oxygen content” as used herein does not mean that oxygen exists in the heating layer as oxygen gas, but indicates oxygen present as an oxide that has reacted with a component of the magnetic metal material that is the heating layer. I have. Conversely, if the oxygen content after the formation of the heat generating layer, the thickness of the heat generating layer, or the applied voltage applied to the sprayed material at the time of forming the heat generating layer is adjusted, the characteristics as the temperature-sensitive magnetic metal are not lost, and A heat generating layer having a Curie temperature different from the Curie temperature can be formed. This makes it possible to produce several types of cooking utensils for electromagnetic induction heating cookers having heating layers with different Curie temperatures,
It can be obtained with one temperature-sensitive magnetic metal having a certain Curie temperature.

In the present invention, a spraying method in a vacuum or in an inert gas atmosphere is proposed as an integrated method so that the composition of the heat generating layer made of a magnetic metal material having a predetermined Curie temperature does not change before and after spraying. However, by using these methods, conventional cladding, brazing,
Phenomena such as a change in Curie temperature and a decrease in bonding strength, which are observed by methods such as pressure welding and melt forging, can be further suppressed.

In addition, since the thermal spraying method is a phenomenon in which the magnetic material is once melted and hardened, the history of slight distortion and a change in the Curie temperature, which occur when the temperature-sensitive magnetic metal is processed into a plate material by the above-mentioned integration method, is eliminated. be able to. Further, since the above phenomenon occurs instantaneously, there is no time for a chemical reaction with other materials to occur, and the Curie temperature hardly changes.

In the thermal spraying method, even if the shape of the cooking utensil becomes complicated, it is possible to cope with the problem. Further, since the heating layer is relatively porous, even if the thermal expansion coefficient is different from that of the cooking utensil bottom surface, the thermal shock is applied. Therefore, an effect of excellent thermal shock resistance can be obtained. Further, since the heat generation layer can be further stabilized by forming a rust-preventive layer of zinc or aluminum or a coating layer of a heat-resistant paint, it is better to form a rust-preventive layer as much as possible.

[0027]

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, 1 is a frying pan-shaped cooking vessel made of an aluminum alloy using ADC-1 having an inner diameter of 260 mm and a bottom thickness of 5.0 mm, and 2 generally has a melting point of about 327 ° C. and a maximum continuous use temperature of 260 mm.
A non-adhesive layer made of PTFE (tetrafluoroethylene resin) having a film thickness of 30 to 45 μm, said to be a temperature of 3 ° C .; This is a heating layer of about 600 μm. In addition, the Curie temperature of the temperature-sensitive magnetic metal as the heating layer is 240 ° C.
The sprayed material was prepared by processing the above-mentioned temperature-sensitive magnetic metal into a wire having a diameter of 1.6 mm, and the composition before forming the heat generating layer by the arc spraying method is shown in Table 1. 4 is a ceramic top plate and 5 is a heating coil.

[0028]

[Table 1]

An experiment was conducted to examine the temperature characteristics of the bottom surface of the cooking vessel using the cooking utensil having such a configuration. In the above configuration, the heat-generating layer after thermal spraying containing no oxygen in the composition is referred to as a product 1 of the present invention, and those having an oxygen content within 0 to 10 wt% are referred to as a product 2 and a product 3 of the present invention. For reference, those having an oxygen content of 10% or more were prepared as Reference 1 and Reference 2, and an experiment was conducted.

The experimental method is as follows. Using a commercially available 100 V electromagnetic induction heating cooker, each cooking utensil is set on the top plate 4 and the baking is measured for about 20 minutes until the temperature is stabilized by heating "strong". Then, a thermocouple was attached to the center of the heat generating layer 3 on the bottom surface of the cooking vessel, and a temperature change until the Curie temperature was stabilized at a predetermined Curie temperature was recorded.

The composition of the temperature-sensitive magnetic metal which is the heat generating layer of the present invention product 2, the present invention product 3, the reference product 1 and the reference product 2 is shown in Table 2.
And the experimental results at that time are shown in (Table 3). FIGS. 2 and 3 show the temperature change and the input value change at that time.

[0032]

[Table 2]

[0033]

[Table 3]

As is apparent from FIG. 2, the oxygen content is 10
%, The reference material 1 tends to approach a certain temperature, but far exceeds the predetermined Curie temperature before the formation of the heat generating layer, has no properties as a temperature-sensitive magnetic metal, and has a balance between heat reception and heat radiation. It is only constant where it was taken. This is apparent from FIG. 3 because no change in the input value occurs even when the temperature exceeds the Curie temperature. In the reference product 2, the input value does not change even when the temperature exceeds the Curie temperature, and the temperature is controlled by the thermistor on the main body side. Therefore, the maximum temperature reached 400 to 420 ° C., and the average temperature at the time of stabilization was as high as 340 to 360 ° C.
On the other hand, the oxygen content of the present invention is 0 to 10% by weight.
For those within, the maximum temperature and the stable temperature were the same, and the Curie temperature was also controlled at approximately 240 ° C., showing superiority in comparison of the temperature change with the reference product.

(Embodiment 2) FIG. 4 shows another embodiment of the present invention. 11 and 12 are the same as 1 and 2 of Example 1, respectively, and are a frying pan-shaped cooking container and a non-adhesive layer. Reference numeral 13 denotes a heat generating layer having a thickness of about 600 μm formed by forming a temperature-sensitive magnetic metal on the back surface of the bottom of the cooking vessel in a nitrogen gas atmosphere by an arc spraying method. However, the Curie temperature of the temperature-sensitive magnetic metal as the heat generating layer was 260 ° C. Reference numeral 14 denotes a rust-preventive layer made of zinc formed on the heat-generating layer 13 by an arc spraying method. Reference numeral 15 denotes a corrosion-resistant melting point outside the rust-preventive layer 14 of about 327 ° C. and a maximum continuous use temperature of 260 ° C. This is a so-called coating layer made of a nonmagnetic material having a thickness of 30 to 45 μm made of PTFE (tetrafluoroethylene resin). The cooking utensil having such a configuration is referred to as a product 4 of the present invention.
An experiment was carried out to examine the temperature characteristics of. For reference, the configuration is the same as that of FIG. 4, but the same experiment was performed on the reference product 3 using the arc spraying method in the atmosphere when the heat generating layer 13 was formed. It is shown in Table 4).

[0036]

[Table 4]

As is apparent from FIG. 5, the reference product 3 using the arc spraying method in the atmosphere showed the same tendency as that of Example 1 in which the oxygen content exceeded 10%. Also, from Table 4, iron, which is the main component of the temperature-sensitive magnetic metal, which is the heat generating layer, is oxidized in the atmosphere before and after thermal spraying, and its composition changes. In contrast, the composition of the temperature-sensitive magnetic metal of the product 4 of the present invention using the arc spraying method in a nitrogen gas atmosphere before and after the formation of the heating layer hardly changed. The maximum temperature and the stable temperature were the same, and the Curie temperature was controlled at 260 ° C., showing a superiority in comparison of the temperature change with the reference product.

Example 3 Using a sprayed wire having a composition shown in Table 1 and having a Curie temperature of 240 ° C., the oxygen content in the heat generating layer 3 of the cooking utensil of the present invention having the same structure as that of FIG. An experiment was conducted to examine the temperature characteristics of the heat generating layer on the bottom surface of the cooking vessel. The experimental method is the same as in Example 1. FIG. 6 shows the temperature characteristics of the heat generating layer on the bottom surface of the cooking vessel, and Table 5 shows the heat generating layers of the present invention 5, the present invention 6, and the present invention 7 in which the oxygen content was adjusted in the range of 0 to 10%. 1 shows the composition and Curie temperature. In addition, Table 7 shows the product 1 of the present invention in which the composition does not change before and after thermal spraying.

[0039]

[Table 5]

As is apparent from FIG. 6, by adjusting the oxygen content of the heat generating layer after thermal spraying, it is possible to form a heat generating layer having a Curie temperature different from a predetermined Curie temperature before thermal spraying. .

(Example 4) A cooking utensil according to the present invention having the same configuration as that of FIG. 1 and a heating layer 3 of the cooking utensil (Table 1)
An experiment was conducted for examining the temperature characteristics of the heat generating layer on the bottom surface of the cooking vessel with respect to the composition shown in FIG. The experimental method is the same as in Example 1. FIG. 7 shows the temperature characteristics of the heat generating layer on the bottom surface of the cooking vessel, and (Table 6) shows the thicknesses of the heat generating layers of the present invention products 8, 9, and 10 obtained by adjusting the thickness of the heat generating layer after thermal spraying. Indicates the Curie temperature.
However, the compositions of the constituent components of the products 8, 9 and 10 of the present invention are the same as those of the product 1 of the present invention, and the heating layer is formed by applying the same voltage to the sprayed wire.

[0042]

[Table 6]

As is clear from FIG. 7, by adjusting the thickness of the heat generating layer after thermal spraying, it is possible to form a heat generating layer having a Curie temperature different from a predetermined Curie temperature before thermal spraying.

(Embodiment 5) A cooking utensil of the present invention having the same configuration as that of FIG. 1 and a device in which a voltage applied to a spray wire required for forming the heat generating layer 3 of the cooking utensil is adjusted. An experiment was conducted to examine the temperature characteristics of the heating layer on the bottom of the cooking vessel. The experimental method is the same as in Example 1. FIG. 8 shows the temperature characteristics of the heat generating layer on the bottom surface of the cooking vessel, and (Table 7) shows the product 11 of the present invention in which the voltage applied to the sprayed wire at the time of spraying was adjusted.
The applied voltage and the Curie temperature of the product of the present invention 12 and the product of the present invention 13 are shown. However, the compositions of the constituents of the products 11, 12 and 13 of the present invention are the same as those of the product 1 of the present invention, and the thickness of the heat generating layer formed is the same.

[0045]

[Table 7]

As is clear from FIG. 8, by adjusting the voltage applied to the thermal spraying wire during thermal spraying, it is possible to form a heat generating layer having a Curie temperature different from a predetermined Curie temperature before thermal spraying. .

The embodiment of the present invention has been described above. In the embodiment of the present invention, the Curie temperature changes as the oxygen content increases. However, the Curie temperature does not always change. Further, in the embodiment of the present invention, an aluminum alloy using ADC-1 was used as a metal cooking container, but the present invention is not particularly limited thereto, and other stainless steel, iron, copper, glass, and an earthen pot may be used. . In the embodiment of the present invention, a commercially available 100 V electromagnetic induction heating cooker is used. However, similar results can be obtained by using a 200 V electromagnetic induction heating cooker. Further, in the embodiment of the present invention, the arc spraying method was used,
The invention is not particularly limited to this, and a gas plasma spraying method or a gas spraying method may be used. Further, the inert gas is not limited to nitrogen gas, but may be argon, helium, or hydrogen gas. Even better in a vacuum. Further, the thermal spraying material is not limited to the wire, but may be a powder material.

[0048]

As described above, the first aspect of the present invention provides
A cooking utensil for an electromagnetic induction heating cooker in which the oxygen content of the heating layer is 10 wt% or less, thereby producing several types of cooking utensils for an electromagnetic induction heating cooker having heating layers with different Curie temperatures. In this case, it can be obtained with one temperature-sensitive magnetic metal having a certain Curie temperature.

The invention according to claim 2 is a cooking utensil for an electromagnetic induction heating cooker in which the oxygen content of the heat generating layer is 0 wt%, and ensures that one temperature-sensitive magnetic metal having a specific Curie temperature Can be obtained at

According to a third aspect of the present invention, there is provided an electromagnetic induction heating method in which a magnetic metal material having a predetermined Curie temperature is sprayed in a vacuum or an inert gas atmosphere to form a heat generating layer on the back surface of a cooking utensil. It is intended to be a method of manufacturing cookware for cookers, and by using this method,
It is possible to further suppress phenomena such as a change in Curie temperature and a decrease in bonding strength, which are observed by conventional methods such as cladding, brazing, pressure welding, and forging.

According to a fourth aspect of the present invention, a heating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal spray material made of a magnetic metal material having a predetermined Curie temperature,
By adjusting the oxygen content of the heating layer, a method for manufacturing a cookware for an electromagnetic induction heating cooker in which the Curie temperature of the formed heating layer is variable,
In addition to being excellent in safety, ease of use and maintenance, the magnetic metal material having a predetermined Curie temperature is oxidized during thermal spraying, and the composition of the heat generating layer after thermal spraying is different from the composition of the heat generating layer before thermal spraying. Can be solved.Even if the components of the magnetic metal material having a predetermined Curie temperature after the thermal spraying are oxidized, by adjusting the degree of oxidation and the thermal spraying conditions, It is possible to provide a cooking utensil for an electromagnetic induction heating cooker capable of forming several types of heat generating layers having a different Curie temperature, and a method for manufacturing the same.

According to a fifth aspect of the present invention, a heating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal spray material made of a magnetic metal material having a predetermined Curie temperature,
The present invention provides a method of manufacturing a cooking utensil for an electromagnetic induction heating cooker in which the Curie temperature of a heat generating layer to be formed is made variable by adjusting the thickness of the heat generating layer.

According to a sixth aspect of the present invention, a heat generating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal spray material made of a magnetic metal material having a predetermined Curie temperature,
A method for manufacturing a cooking utensil for an electromagnetic induction heating cooker in which a Curie temperature of a heat generating layer to be formed is made variable by adjusting a voltage applied to a thermal spray material required for forming the heat generating layer. .

As a result, the magnetic metal material having a predetermined Curie temperature is oxidized during thermal spraying, and the composition of the heat generating layer after thermal spraying is particularly excellent in safety, usability, and careability. Unlike the composition of the layer, the problem that the Curie temperature changes can be solved, and even if the components of the magnetic metal material having a predetermined Curie temperature are oxidized after thermal spraying, the degree of oxidation and thermal spraying conditions By adjusting the temperature, it is possible to provide a cooking utensil for an electromagnetic induction heating cooker capable of forming any number of types of heat generating layers having a Curie temperature different from that before spraying, and a method for manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cooking utensil for an electromagnetic induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a temperature characteristic of a bottom surface of a cooking container according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram of an input value according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a cooking utensil for an electromagnetic induction heating cooker according to a second embodiment of the present invention.

FIG. 5 is a temperature characteristic diagram of the bottom surface of the cooking container in the second embodiment of the present invention.

FIG. 6 is a temperature characteristic diagram of a bottom surface of a cooking container according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a temperature characteristic of a bottom surface of a cooking vessel according to a fourth embodiment of the present invention.

FIG. 8 is a diagram showing a temperature characteristic of a bottom surface of a cooking vessel according to a fifth embodiment of the present invention.

[Explanation of symbols]

 1,11 Cooking vessel 2,12 Non-adhesive layer 3,13 Heat generation layer 4 Top plate 5 Heating coil 14 Rust prevention layer 15 Coating layer

Claims (6)

[Claims] 1. A cooking utensil for an electromagnetic induction heating cooker, wherein a heating layer made of a magnetic metal material having a predetermined Curie temperature is provided on the back surface of the cooking appliance, and the oxygen content of the heating layer is 10 wt% or less. 2. A cooking utensil for an electromagnetic induction heating cooker, wherein a heating layer made of a magnetic metal material having a predetermined Curie temperature is provided on the back surface of the cooking appliance, and the oxygen content of the heating layer is 0 wt%. 3. A cooking utensil for an electromagnetic induction heating cooker in which a heat generating layer is formed on the back surface of a cooking utensil by performing thermal spraying in a vacuum or an inert gas atmosphere using a magnetic metal material having a predetermined Curie temperature. Production method. 4. A heating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal spray material made of a magnetic metal material having a predetermined Curie temperature, and by adjusting the oxygen content of the heating layer, A method for manufacturing a cooking utensil for an electromagnetic induction heating cooker in which the Curie temperature of a formed heat generating layer is variable. 5. A heating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal spray material made of a magnetic metal material having a predetermined Curie temperature, and is formed by adjusting the thickness of the heating layer. A method for producing a cooking utensil for an electromagnetic induction heating cooker, wherein the Curie temperature of the heating layer is variable. 6. A heat-generating layer is formed on the back surface of the cooking utensil by performing thermal spraying using a thermal-spraying material made of a magnetic metal material having a predetermined Curie temperature, and the thermal spraying material necessary for forming the heat-generating layer is formed. A method of manufacturing a cooking utensil for an electromagnetic induction heating cooker in which the Curie temperature of a heat generating layer to be formed is made variable by adjusting an applied voltage.