CN114645305A - Cooking utensil - Google Patents

Abstract

The application provides a cooking appliance, which comprises a vessel and a heat insulation layer, wherein the vessel is made of magnesium alloy; the thermal insulation layer covers the outer surface of the vessel. The application can provide a quality is lighter and do not produce cooking utensil of oil smoke.

Description

cooking utensils

technical field

The present application relates to the technical field of kitchen tools, and in particular, to a cooking utensil.

Background technique

Fume-free cooking utensils will not produce oil fume when cooking. The use of this product has brought a kitchen revolution to the family, freeing family cooking from oil fume, and is deeply loved by consumers. The fume-free cooking utensils not only solves the problem that the fume endangers human health and induces various diseases, but also avoids the fume produced during cooking to pollute the environment.

The reason why household non-fume cooking utensils have no oil fume effect is to control the temperature of the bottom of the pot within 220 ℃ within a certain period of time, because the cracking temperature of ordinary cooking oil is 220 ℃ ~ 240 ℃, as long as the bottom of the pot exceeds this temperature, There will definitely be fumes. Usually, the main means of suppressing the generation of oil fume is to increase the thickness of the pot body, which leads to an increase in the weight of the cooking utensil and affects the use experience of the cooking utensil.

SUMMARY OF THE INVENTION

The present application provides a cooking utensil to provide a cooking utensil that is light in weight and does not generate oily smoke.

The application provides a cooking utensil, which includes:

A vessel, the material of the vessel is magnesium alloy;

The thermal insulation layer covers the outer surface of the vessel.

The above-mentioned cooking utensil includes a utensil and a heat insulation layer; the material of the utensil is magnesium alloy, and the magnesium alloy has the characteristics of low density, fast heat conduction and fast heat dissipation, which can reduce the weight of the utensil and make the heat spread rapidly along the utensil, so that the surface of the utensil can be reduced. The temperature of the utensils tends to be uniform to avoid local overheating and the production of oil fumes; the heat insulation layer covers the outer surface of the utensils to prevent the utensils from directly contacting the heat source, reducing the heat transferred from the heat source to the utensils, and preventing the utensils from being overheated, thereby avoiding the occurrence of cooking. In addition, the heat insulation layer is arranged on the outer surface of the utensil to play a role of heat preservation, so that the heat absorbed by the utensil can only be radiated to the side where the inner surface of the utensil is located for cooking ingredients, thereby improving the utilization rate of heat .

Optionally, along the direction from the bottom of the vessel to the mouth, the thickness of the vessel gradually decreases; since the heat source is located at the bottom of the vessel, the portion of the vessel close to the heat source obtains more heat. Slow down the heat transfer at the bottom of the vessel; the part of the vessel away from the heat source gets less heat, reducing the thickness of the wall of the vessel can make the heat transfer along the wall of the vessel easier, so that the heat is distributed more evenly on the inner surface of the vessel , to avoid the local temperature is too high to produce soot.

Optionally, the cooking utensil further includes an anti-corrosion layer, and the anti-corrosion layer covers the inner surface of the utensil. Due to the high activity of metal magnesium, it is easy to react with the acidic liquid. The anti-corrosion layer can prevent corrosion on the surface of the cooking utensils and prolong the service life of the cooking utensils.

Optionally, the anti-corrosion layer is an oxide film, which does not change the original thickness of the cooking utensil and can prevent the anti-corrosion layer from falling off during use.

Optionally, the thickness of the oxide film is 8 μm˜20 μm, so as to form reliable protection and ensure the surface quality of the cooking utensils.

Optionally, the anti-corrosion layer is formed by a micro-arc oxidation process, and the film layer after the micro-arc oxidation process has high hardness, and the bonding force between the film layer and the vessel is strong, thereby effectively preventing the anti-corrosion layer from appearing during use. Wear or fall off, prolong the service life of cooking utensils, and the micro-arc oxidation treatment process is simple, the production efficiency is high, the electrolyte does not contain toxic substances and heavy metal elements, the electrolyte has strong anti-pollution ability and high regeneration and reuse rate. The environmental pollution is small, and it meets the needs of high-quality clean production.

Optionally, along the direction from the bottom of the vessel to the mouth, the thickness of the heat insulating layer gradually decreases. Since the heat source is located at the bottom of the heat insulating layer, the portion of the heat insulating layer close to the heat source obtains more heat, which increases. The thickness of the bottom of the thermal insulation layer can slow down the heat transfer at the bottom of the thermal insulation layer; the part of the thermal insulation layer far from the heat source obtains less heat, and reducing the thickness of the wall of the thermal insulation layer can make the heat flow along the wall of the thermal insulation layer. The transfer of heat is easier, so that the heat is more evenly distributed on the inner surface of the insulation layer, so that the heat can be transferred evenly to the vessel.

Optionally, the components of the thermal insulation layer include aluminum oxide and titanium oxide; the thermal conductivity of aluminum oxide is relatively low, and the main body of the thermal insulation layer is formed by aluminum oxide, thereby ensuring the thermal insulation effect of the thermal insulation layer; the melting point of titanium oxide The adhesive is formed by melting titanium oxide, which improves the reliability of the connection between the thermal insulation layer and the vessel, and prevents the thermal insulation layer from falling off during use.

Optionally, in the thermal insulation layer, the mass ratio of the titanium oxide is 10% to 50%, so that the thermal insulation layer has a reliable thermal insulation effect, and the thermal insulation layer and the utensil have a high thermal insulation effect. adhesion.

Optionally, the thermal insulation layer is formed by spraying a composite powder formed of aluminum oxide and titanium oxide, so that the aluminum oxide and titanium oxide can be mixed more uniformly, thereby increasing the uniformity of the distribution of each component in the thermal insulation layer and preventing localization. The temperature is too high and soot is produced.

Optionally, the particle size range of the composite powder is 300 mesh to 1000 mesh, so that the composite powder can be fully melted and the deposition efficiency of the composite powder on the surface of the vessel is improved.

Optionally, in the composite powder, the mass ratio of the titanium oxide is 10% to 50%, so that the powder can form a thermal insulation layer with good thermal insulation performance and improve the deposition efficiency of the composite powder on the surface of the vessel.

Optionally, the thickness of the thermal insulation layer is 100 μm to 300 μm, which can not only form a reliable thermal insulation effect, but also prevent the thermal insulation layer from being too thick to affect the heating rate of the cooking vessel, and also prevent the thermal insulation layer from being generated by itself. damage.

Optionally, the thermal insulation layer is formed by a plasma spraying process, that is, a plasma arc driven by direct current is used as a heat source to heat the raw material powder to a molten or semi-molten state, and spray the surface of the vessel at a high speed to form. The method of attaching a firm surface layer, thereby forming a uniform film layer, and ensuring the reliability of the bonding between the film layer and the vessel.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and do not limit the application.

Description of drawings

1 is a schematic structural diagram of a cooking utensil provided by an embodiment of the present application;

FIG. 2 is a partial enlarged view of FIG. 1 .

Reference number:

1 - vessel;

2- thermal insulation layer;

3-Anti-corrosion layer.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for the purpose of description, and should not be construed as indicating or implying relative importance; unless otherwise specified or explained , the term "multiple" refers to two or more; the terms "connection" and "fixed" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral Connection, or electrical connection; either directly or indirectly through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described from the perspective shown in the accompanying drawings, and should not be construed as referring to the embodiments of the present application. limited. Also, in this context, it should also be understood that when an element is referred to as being "on" or "under" another element, it can not only be directly connected "on" or "under" the other element, but also Indirectly connected "on" or "under" another element through intervening elements.

As shown in FIG. 1 , the present application provides a cooking utensil, which includes a vessel 1 and an insulating layer 2; the vessel 1 is made of magnesium alloy, and the magnesium alloy has the characteristics of low density, fast heat conduction and fast heat dissipation, which can reduce the The weight of the utensil 1 makes the heat spread rapidly along the utensil 1, so that the temperature of the surface of the utensil 1 tends to be uniform, so as to avoid local overheating and the generation of oil fume; the heat insulation layer 2 covers the outer surface of the utensil 1, so as to prevent the The heat source is in contact to reduce the heat transferred from the heat source to the vessel 1, preventing the vessel 1 from being overheated, thereby avoiding the generation of oily smoke during cooking.

Specifically, the heat transfer method of cooking utensils is mainly heat conduction, and the formula applicable to the heat transfer of cooking utensils is the flat-wall heat conduction formula such as formula (1):

From the deformation of formula (1), it can be known that:

In the formula, Q-heat transfer; λ-material thermal conductivity; b-wall thickness; S-heat transfer area; t1-high temperature surface temperature; t2-low temperature surface temperature.

The formula is further simplified to the heat transfer per unit area plate (that is, let S=1), and the heat transfer Q is represented by the heat transfer rate q and the heat transfer time T:

It can be seen from formula (3) that when the heat source heats the cooking utensil, t2 is the temperature of the inner surface of the cooking utensil, t1 is the temperature of the outer surface of the cooking utensil, and the left side of the formula is the heating rate; Or the smaller λ is (ie the lower the thermal conductivity of the material used in the cooking appliance), the smaller t2 is (ie the lower the temperature of the inner surface of the cooking appliance in the same time period).

When the thermal conductivity of the material of the cooking utensil is low, the heat conduction speed along the thickness direction of the cooking utensil is slow, and the heat conduction speed along the circumferential direction of the cooking utensil is also slow, resulting in heat concentration at the bottom of the cooking utensil near the heat source; The heat path is much smaller than the circumferential heat transfer path, resulting in the temperature rise rate of the cooking utensil along the thickness direction and the circumferential temperature rise rate, resulting in uneven temperature field distribution along the circumferential direction of the cooking utensil, resulting in local high temperature and oil fume. When the thickness of the cooking utensils is large, the temperature of the cooking utensils along the circumferential direction can be made uniform, but the increase in the thickness will lead to an increase in the weight of the cooking utensils and affect the experience of using the cooking utensils; in addition, increasing the thickness of the cooking utensils adopts the The methods mainly include the use of composite bottoms and the preparation of coatings. Due to the influence of bond strength and internal stress, the thicknesses of composite bottoms and coatings are limited, resulting in limited improvement in temperature distribution.

The material of the vessel 1 of the cooking utensil provided in the embodiment of the present application is a magnesium alloy, wherein the magnesium alloy can be AZ91D or AM60B, which has high toughness and moderate strength and is convenient for die-casting. The density of magnesium is 2/3 of that of aluminum. Using magnesium alloy to prepare vessel 1 can significantly reduce the weight of vessel 1; the specific heat capacity of magnesium is 244Kcal/(kg·℃), the thermal conductivity is 154.5W/m·k, and the specific heat capacity of aluminum is 880J/(kg·℃) and thermal conductivity of 237W/m·k, it can be seen that the heat transfer rate of magnesium is slightly slower than that of aluminum, but it still has a high thermal conductivity, so that the heat is evenly distributed along the thickness and circumferential directions of the cooking utensils. It can be transferred quickly, so that the temperature of the surface of the vessel 1 tends to be uniform, avoiding the formation of local high temperature and the generation of oil fume; and the heat required for magnesium to rise by 1 degree is less than that of aluminum, so when the vessel 1 absorbs the same heat, the magnesium The temperature rises faster, so that the surface of the utensil 1 can be quickly raised to the temperature required for cooking the ingredients, thereby improving the efficiency of cooking the ingredients.

The thermal insulation layer 2 covers the outer surface of the vessel 1, the thermal conductivity of the thermal insulation layer 2 is low, and the thermal insulation layer 2 only needs a small thickness to form a good heat blocking effect, that is, the thermal insulation layer 2 does not It will lead to a significant increase in the thickness of the cooking utensil, so that the total weight of the cooking utensil can be reduced; in addition, by disposing the heat insulating layer 2 on the outer surface of the utensil 1, it has a thermal insulation effect, so that the heat absorbed by the utensil 1 can only be transferred to the utensil 1. The side where the inner surface of 1 is located radiates and is used for cooking ingredients, thereby improving the utilization rate of heat.

Further, along the direction from the bottom of the vessel 1 to the mouth, the thickness of the vessel 1 gradually decreases, that is, the thickness of the bottom of the vessel 1 is greater than the thickness of the wall of the vessel 1, and the wall of the vessel 1 goes from bottom to The upper thickness gradually decreases. Since the heat source is located at the bottom of the vessel 1, the portion of the vessel 1 close to the heat source obtains more heat. Increasing the thickness of the bottom of the vessel 1 can slow down the heat transfer at the bottom of the vessel 1; the portion of the vessel 1 far from the heat source obtains less heat, reducing the The thickness of the wall of the vessel 1 can make the heat transfer along the wall of the vessel 1 easier, so that the heat is distributed more evenly on the inner surface of the vessel 1, and the local temperature is too high to generate oil fumes. Furthermore, by reducing the thickness of the wall portion of the vessel 1, the weight of the vessel 1 can be further reduced.

Further, the cooking utensil also includes an anti-corrosion layer 3, and the anti-corrosion layer 3 covers the inner surface of the vessel 1. Due to the high activity of metal magnesium, it is easy to react with the acidic liquid. 3. It can prevent corrosion on the surface of cooking utensils and prolong the service life of cooking utensils.

Further, the anti-corrosion layer 3 is an oxide film, which does not change the original thickness of the cooking utensil, and can prevent the anti-corrosion layer 3 from falling off during use. It can be understood that the anti-corrosion layer 3 can also be other film layers with corrosion resistance and compact structure.

Further, the thickness of the oxide film is 8 μm˜20 μm, for example, the thickness of the oxide film can be 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm or 20 μm, etc., to form reliable protection and ensure the surface quality of the cooking utensils. When the thickness of the oxide film is less than 8 μm, the thickness of the oxide film is too thin, and the corrosion resistance of the oxide film is poor. When the thickness is greater than 20 μm, the thickness of the oxide film is too thick, which reduces the interlayer bonding force of the oxide film, and makes the structure of the oxide film loose, resulting in poor surface quality of the cooking utensil and increased production costs.

Further, the anti-corrosion layer 3 is formed by the micro-arc oxidation process, the film layer after the micro-arc oxidation process has high hardness, and the bonding force between the film layer and the vessel 1 is strong, thereby effectively preventing the anti-corrosion layer 3 from appearing during use. Wear or fall off, prolong the service life of cooking utensils, and the micro-arc oxidation treatment process is simple, the production efficiency is high, the electrolyte does not contain toxic substances and heavy metal elements, the electrolyte has strong anti-pollution ability and high regeneration and reuse rate. The environmental pollution is small, and it meets the needs of high-quality clean production. Of course, the anti-corrosion layer 3 can also be formed by an anodizing process or a chemical oxidation process or the like.

Specifically, when the anti-corrosion layer 3 is formed by a micro-arc oxidation process, a specific embodiment includes: voltage: 250V; power pulse: double-pulse power supply; frequency: 500Hz, duty cycle 25%; electrolyte composition: 17.5 g/L NaAlO ₂ , 5 g/L Na ₃ PO ₄ , 5 g/L NaOH, 3 g/L Na ₄ BH ₇ , 4.25 g/L ₆ H ₅ Na ₃ O ₇ .

Further, along the direction from the bottom of the vessel 1 to the mouth, the thickness of the heat insulating layer 2 gradually decreases. Since the heat source is located at the bottom of the heat insulating layer 2, the heat insulating layer 2 gets more heat near the heat source. The thickness of the bottom of the thermal layer 2 can slow down the heat transfer at the bottom of the thermal insulation layer 2; the heat insulation layer 2 gets less heat at the part far from the heat source, and reducing the thickness of the wall of the thermal insulation layer 2 can make the heat along the thermal insulation layer 2. The transfer of the wall of the layer 2 is easier, so that the heat is distributed more evenly on the inner surface of the insulating layer 2, so that the heat can be transferred to the vessel 1 evenly. The weight of the heat insulating layer 2 can be further reduced by reducing the thickness of the wall portion of the heat insulating layer 2 .

Further, the components of the thermal insulation layer 2 include aluminum oxide and titanium oxide; the thermal conductivity of aluminum oxide is relatively low, and the main body of the thermal insulation layer 2 is formed by the aluminum oxide, thereby ensuring the thermal insulation effect of the thermal insulation layer 2; the melting point of the titanium oxide Lower, the adhesive is formed by melting titanium oxide, which improves the reliability of the connection between the thermal insulation layer 2 and the vessel 1, and prevents the thermal insulation layer 2 from falling off during use.

Further, in the thermal insulation layer 2, the mass ratio of titanium oxide is 10% to 50%, for example, the mass ratio of titanium oxide in the thermal insulation layer 2 can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, etc., so that the thermal insulation layer 2 has a reliable thermal insulation effect, and the thermal insulation layer 2 and the vessel 1 have a high adhesive force. When the mass ratio of titanium oxide in the thermal insulation layer 2 is less than 10%, the content of titanium oxide in the thermal insulation layer 2 is too small, which will reduce the deposition efficiency of the thermal insulation layer 2 and affect the production efficiency of the thermal insulation layer 2. As a result, the bonding force between the thermal insulation layer 2 and the utensil 1 is difficult to meet the requirements, which affects the service life of the cooking utensils; when the mass ratio of titanium oxide in the thermal insulation layer 2 is higher than 50%, the content of titanium oxide in the thermal insulation layer 2 is too high. If it is too large, the content of alumina in the heat insulating layer 2 is too small, and the heat insulating effect of the heat insulating layer 2 is reduced.

In one embodiment, the thermal insulation layer 2 is formed by spraying a composite powder formed of aluminum oxide and titanium oxide, that is, firstly, the aluminum oxide and titanium oxide are mixed and granulated according to an appropriate ratio to form a composite powder, and then the composite powder is formed by spraying. The thermal insulation layer 2 is formed by spraying on the surface of the vessel 1, so that the alumina and titanium oxide can be mixed more uniformly, thereby increasing the uniformity of the distribution of each component in the thermal insulation layer 2, enhancing the consistency of the film layer, and preventing the local temperature from being overheated. high to produce oil fumes.

Further, the particle size range of the composite powder is 300 mesh to 1000 mesh, for example, the particle size of the composite powder can be 300 mesh, 400 mesh, 500 mesh, 600 mesh, 700 mesh, 800 mesh, 900 mesh or 1000 mesh, etc., so that The composite powder can be fully melted to improve the deposition efficiency of the composite powder on the surface of the vessel 1 . When the particle size of the composite powder is greater than 300 mesh, the particle size of the composite powder is too large, which makes it difficult to fully melt the composite powder, thereby reducing the deposition rate of the composite powder on the surface of the vessel 1 and increasing the difficulty of preparing the thermal insulation layer 2; When the particle size is less than 1000 mesh, the particles of the composite powder are too small, which leads to agglomeration of the composite powder, which causes the composite powder to block the spray gun, affects the normal preparation of the coating, and affects the uniformity of the coating.

Further, in the composite powder, the mass ratio of titanium oxide is 10% to 50%, for example, the mass ratio of titanium oxide in the composite powder can be 10%, 15%, 20%, 25%, 30%, 35%, 40% %, 45% or 50%, etc., so that the powder can form a thermal insulation layer 2 with good thermal insulation performance, and improve the deposition efficiency of the composite powder on the surface of the vessel 1 . Because the melting point of alumina is too high, it is difficult to melt during spraying, that is to say, by adding titanium oxide to reduce the melting point of the composite powder, during the spraying process, the melting of titanium oxide acts as a binder; When the mass ratio of titanium oxide is less than 10%, the content of titanium oxide in the composite powder is too small, and the melting point of the composite powder is not significantly lowered, which makes it difficult for the composite powder to adhere to the surface of the vessel 1, resulting in a decrease in the deposition efficiency of the composite powder, affecting the insulation. The production efficiency of the thermal layer 2 will make the adhesion between the thermal insulation layer 2 and the utensil 1 difficult to meet the requirements, which will affect the service life of the cooking utensils; when the mass ratio of titanium oxide in the composite powder is higher than 50%, the composite powder If the content of titanium oxide is too high, the content of aluminum oxide which plays a heat insulating effect is too small, thereby reducing the heat insulating effect of the heat insulating layer 2, and also causing the production cost to be too high.

Further, the thickness of the thermal insulation layer 2 is 100 μm˜300 μm, for example, the thickness of the thermal insulation layer 2 can be 230μm, 240μm, 250μm, 260μm, 270μm, 280μm, 290μm or 300μm, etc., not only can form a reliable heat insulation effect, but also can avoid the heat insulation layer 2 is too thick to affect the heating rate of the cooking vessel 1, and can also prevent heat insulation Layer 2 itself produces damage. When the thickness of the thermal insulation layer 2 is less than 100 μm, the thickness of the thermal insulation layer 2 is too thin, so that the thermal insulation effect of the thermal insulation layer 2 cannot meet the requirements; 2 The heat transferred to the vessel 1 is too small, resulting in excessive heat waste, and the interlayer bonding force of the thermal insulation layer 2 is reduced, and a large internal stress is easily formed in the thermal insulation layer 2, resulting in cracking of the thermal insulation layer 2 and other defects.

Further, the thermal insulation layer 2 is formed by a plasma spraying process, that is, a plasma arc driven by direct current is used as a heat source to heat the raw material powder to a molten or semi-molten state, and spray it to the surface of the vessel 1 at a high speed to form adhesion. A method for a firm surface layer, thereby forming a uniform film layer, and ensuring the reliability of the bonding between the film layer and the vessel 1 . Of course, the heat insulating layer 2 can also be formed by other spraying processes.

Specifically, when the thermal insulation layer 2 is formed by a plasma spraying process, a specific embodiment includes: the powder feeding speed is 30g/min～40g/min; C, the spraying distance is 140mm～160mm; D, the voltage is 40V～45V, the current 250A～300A; E. Hydrogen pressure 0.5MPa～0.9MPa, flow 6L/min～10L/min, argon pressure 0.5MPa～0.9MPa, flow 40L/min～70L/min. Multiple spraying method is adopted, and the thickness of each spraying is 0.05mm to increase the compactness and uniformity of the film layer.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (14)

1. A cooking appliance, comprising:

the vessel (1), the material of the said vessel (1) is magnesium alloy;

and the heat insulation layer (2) covers the outer surface of the vessel (1).

2. The cooking appliance according to claim 1, wherein the thickness of the vessel (1) is gradually reduced in a direction in which the bottom of the vessel (1) points towards the mouth.

3. The cooking appliance according to claim 1, further comprising a corrosion protection layer (3), the corrosion protection layer (3) covering an inner surface of the vessel (1).

4. The cooking appliance according to claim 3, wherein the corrosion protection layer (3) is an oxide film.

5. The cooking appliance according to claim 4, wherein the thickness of the oxide film is 8 μm to 20 μm.

6. The cooking appliance according to claim 3, wherein the corrosion protection layer (3) is formed by a micro arc oxidation process.

7. Cooking appliance according to any of claims 1 to 6, wherein the thickness of the insulating layer (2) is gradually reduced in the direction from the bottom of the vessel (1) towards the mouth.

8. Cooking appliance according to any of claims 1 to 6, characterized in that the composition of the insulating layer (2) comprises aluminium oxide and titanium oxide.

9. The cooking appliance according to claim 8, wherein the titanium oxide is present in the heat insulating layer (2) in a proportion of 10 to 50% by mass.

10. The cooking appliance according to any one of claims 1 to 6, wherein the thermal insulation layer (2) is formed by spraying composite powder formed by aluminum oxide and titanium oxide.

11. The cooking appliance of claim 10, wherein the composite powder has a particle size ranging from 300 mesh to 1000 mesh.

12. The cooking appliance according to claim 10, wherein the composite powder contains titanium oxide in an amount of 10 to 50% by mass.

13. Cooking appliance according to any of claims 1 to 6, characterized in that the thickness of the insulating layer (2) is between 100 μm and 300 μm.

14. The cooking appliance according to any of the claims 1 to 6, wherein the insulation layer (2) is formed using a plasma spray process.

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