Composite non-stick coating, pot and cooking utensil

Abstract

The invention provides a composite non-stick coating, a pot and a cooking utensil. The composite non-stick coating comprises a hard framework, the hard framework is provided with pores, any cross section of the hard framework is provided with a plurality of concave-convex structures, and height differences exist between convex parts and concave parts of the concave-convex structures; and the holes are filled with the non-stick filler. Therefore, the hard framework can provide good wear resistance for the composite non-stick coating, and the non-stick filler can provide good non-stick performance for the composite non-stick coating, so that when the composite non-stick coating is used for the cookware, the composite non-stick coating is not prone to being abraded in the cooking and cleaning process, the use performance of the cookware is improved due to the good non-stick performance, and the service life of the cookware is prolonged. The cooking experience of a user is improved, and the good taste of food is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of electrical appliances, and in particular to a composite non-stick coating, a pot and a cooking utensil. Background Art

[0002] As people's demand for easy-to-clean cooking utensils continues to increase, it is more common for frying pans to use non-stick coatings. However, traditional coated non-stick pans have low hardness, poor wear resistance, and are not resistant to metal spatulas and steel wool. Traditional metal pots, such as stainless steel pots and iron pots, can be cooked with metal spatulas and cleaned with steel wool, but they have poor non-stick properties and a poor cooking experience. In order to solve the problems of short life, non-wear resistance, and easy shedding of non-stick coatings, the industry began to study the lotus leaf effect, engraving concave and convex micro-nano structures on the surface of the pot to achieve wear-resistant and non-stick effects. However, this physical non-stick layer uses more concave and convex structures to lock in oil, and achieves a certain degree of non-stickiness through the effect of the oil film on the surface of the pot after heating. This is not a true non-stick pan, and the actual use effect is far from market expectations. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to provide a composite non-stick coating, which has good non-stick properties and wear resistance.

[0004] In one aspect of the present invention, the present invention provides a composite non-stick coating. According to an embodiment of the present invention, the composite non-stick coating comprises: a hard skeleton, the hard skeleton has pores, any cross section of the hard skeleton has a plurality of concave-convex structures, and there is a height difference between the protruding parts and the recessed parts of the concave-convex structures; a non-stick filler, the non-stick filler is filled in the pores. Thus, the hard skeleton can provide good wear resistance for the composite non-stick coating, and the non-stick filler can provide good non-stick performance for the composite non-stick coating, so when the composite non-stick coating is used for cookware, the composite non-stick coating is not easily worn during cooking and cleaning, and good non-stickiness improves the performance of the cookware, improves the user's cooking experience, and ensures a good taste of food.

[0005] According to an embodiment of the present invention, the raw material used to form the hard skeleton is hard particles, the particle size of the hard particles is R, and the height difference is 1 / 10R to 1 / 2R.

[0006] According to an embodiment of the present invention, the height difference is 5 μm to 50 μm.

[0007] According to an embodiment of the present invention, the hard skeleton is formed by a thermal spraying process.

[0008] According to an embodiment of the present invention, the composite non-stick coating has a thickness of 1 mm in any cross section or longitudinal section. 2In the region, the protruding area is S 凸 The area of ​​the concave portion is S 凹 , then S 凸 and S 凹 Satisfaction: S 凸 / S 凹 =2~19.

[0009] According to an embodiment of the present invention, the thermal conductivity of the composite non-stick coating is 5-14 W / mK.

[0010] According to an embodiment of the present invention, the pores are connected in the hard skeleton.

[0011] According to an embodiment of the present invention, the porosity is 5% to 30%.

[0012] According to an embodiment of the present invention, the hard skeleton is a metal-based skeleton, a ceramic-based skeleton or a metal / ceramic-based skeleton.

[0013] According to an embodiment of the present invention, the metal-based skeleton is an iron-based alloy material, including iron and auxiliary raw materials, wherein the auxiliary raw materials include at least one of chromium, nickel, boron, silicon, carbon, molybdenum and oxygen, wherein the mass content of boron is 0.5% to 6%.

[0014] According to an embodiment of the present invention, the cookware further comprises a transition layer, wherein the transition layer is located on at least a portion of the inner surface of the cookware body, and the composite non-stick coating is located on at least a portion of the surface of the transition layer away from the cookware body.

[0015] According to an embodiment of the present invention, the transition layer is a porous structure, the porosity of the transition layer is 1% to 20%, and the porosity of the transition layer is smaller than the porosity of the hard skeleton.

[0016] In another aspect of the present invention, the present invention provides a cookware. According to an embodiment of the present invention, the cookware comprises: a cookware body; the composite non-stick coating described above, wherein the composite non-stick coating is disposed on the inner surface of the cookware body. Thus, the cookware has good wear resistance and non-stick properties, and improves the performance and user experience of the cookware. It can be understood by those skilled in the art that the cookware has all the features and advantages described above, and no further elaboration is given here.

[0017] In another aspect of the present invention, the present invention provides a cooking utensil. The cooking utensil comprises the above-mentioned pot. Thus, the cooking utensil has good wear resistance and non-stick properties, thereby improving the performance of the cooking utensil and the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic cross-sectional view of a composite non-stick coating in one embodiment of the present invention;

[0020] Figure 2 is a local scanning electron microscope image of a composite non-stick coating in another embodiment of the present invention;

[0021] Figure 3 is a structural schematic diagram of a cooker in another embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a cooker in another embodiment of the present invention.

[0023] The reference numerals in the drawings are as follows: composite non-stick coating 10 , hard skeleton 11 , protrusion 111 , non-stick filler 12 , recess 112 , cookware body 20 , transition layer 30 . DETAILED DESCRIPTION

[0024] The scheme of the present invention will be explained below in conjunction with the embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used are not indicated by the manufacturer and are all conventional products that can be obtained commercially.

[0025] The present invention is described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0026] In one aspect of the present invention, the present invention provides a composite non-stick coating. Figure 1 and Figure 2 ( Figure 2 : is a partial scanning electron microscope image of a composite non-stick coating, the composite non-stick coating 10 comprises: a hard skeleton 11, the hard skeleton has pores, any cross section of the hard skeleton 11 has a plurality of concave-convex structures, and there is a height difference D between the protruding part 111 and the concave part 112 of the concave-convex structure; a non-stick filler 12, the non-stick filler 12 is filled in the pores. Thus, the hard skeleton can provide good wear resistance for the composite non-stick coating, and the non-stick filler can provide good non-stick performance for the composite non-stick coating, so when the composite non-stick coating is used for cookware, the composite non-stick coating is not easily worn during cooking and cleaning, and good non-stick properties improve the performance of the cookware, improve the cooking experience of the user, and ensure the good taste of the food.

[0027] The cross section refers to the cross section of the composite non-stick coating in a direction perpendicular to the thickness direction of the composite non-stick coating, while the cross section of the composite non-stick coating in the thickness direction of the composite non-stick coating is the longitudinal section. In addition, the protruding parts 111 and the recessed parts 112 of the concave-convex structure are relative, that is, for adjacent protruding parts 111 and recessed parts 112, if any one of them is defined as a protruding part, the other is defined as a recessed part, and the recessed space of the recessed part constitutes a pore for filling non-stick fillers, and the protruding part is a hard skeleton.

[0028] According to an embodiment of the present invention, the hard skeleton is formed by a thermal spraying process. By forming a hard skeleton by thermal spraying, the bonding force between the hard skeleton and the substrate can be effectively improved (i.e., the raw material used to form the hard skeleton is a hard particle thermally sprayed on the substrate to form a hard skeleton), the preparation process is mature, and it is convenient for industrial production. The technicians in this field adjust the process parameters of thermal spraying according to actual needs, so that the hard skeleton is a porous skeleton, that is, it has pores. According to some embodiments of the present invention, during the thermal spraying process, the surface of the hard particles is melted while the inside remains in a solid state of semi-molten particles, and the semi-molten particles are sprayed on the substrate to form a porous hard skeleton (i.e., the pores are connected in the hard skeleton) and the particles are metallurgically connected. The internal structure of the hard skeleton is that the particles are connected in a spherical stacking manner, and the gaps between the particles form pores.

[0029] According to an embodiment of the present invention, the raw material used to form the hard skeleton is hard particles, the particle size of the hard particles is R, and the height difference D is 1 / 10R to 1 / 2R (for example, the height difference D is 1 / 10R, 1 / 9R, 1 / 8R, 1 / 7R, 1 / 6R, 1 / 5R, 1 / 4R, 1 / 3R, 1 / 2R). Therefore, those skilled in the art can control the size of the pores according to the size of the hard particles, thereby controlling the proportion of the pores in the hard skeleton, so as to better control the performance of the composite non-stick coating, so that it has good wear resistance and non-stick properties at the same time. In some embodiments of the present invention, the particle size of the hard particles is 50 microns to 100 microns. In some embodiments, the height difference is 5μm to 50μm (for example, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm). In this way, the depth of the pores in the recessed portion is appropriate, and the non-stick filler can be effectively filled without making the pore depth too deep, resulting in the actual thickness of the skeleton here being thin, affecting the strength of the hard skeleton.

[0030] It should be noted that in the same composite non-stick coating product, the heights at different positions are different, as long as the height difference is between 1 / 10R and 1 / 2R. In the same composite non-stick coating product, the height difference is between 5μm and 50μm.

[0031] In some embodiments, the thickness of the composite non-stick coating is 50 μm to 300 μm, that is, the maximum thickness of the hard skeleton is 50 μm to 300 μm, thus providing good strength for the composite non-stick coating and allowing it to adhere well to the substrate, thereby improving the interlayer bonding strength between the two. If the thickness of the composite non-stick coating is less than 50 μm, there is a risk of wear-through during long-term use, and the long-term use requirements of users cannot be fully met. If the composite non-stick coating exceeds 300 μm, it will not substantially help the service life of the product. On the contrary, the excessive thickness of the composite non-stick coating will reduce the interface bonding strength between the composite non-stick coating and the substrate layer.

[0032] According to an embodiment of the present invention, the porosity is 5% to 30%, such as 5%, 12%, 15%, 18%, 20%, 23%, 25%, 28%, and 30%. In this way, the proportion of pores is appropriate, which can effectively meet the filling of non-stick fillers, so that the composite non-stick coating has good non-stick properties and good wear resistance; if the porosity is less than 5%, the proportion of the non-stick surface area is too low, and the non-stick effect will be limited; if the porosity is greater than 30%, the hard skeleton will be relatively loose, affecting the wear resistance and structural stability of the hard skeleton.

[0033] Furthermore, the width of the pores is 5μm to 150μm, which can effectively ensure that the non-stick filler can be smoothly filled into the pores, and at the same time ensure the good hardness of the hard skeleton; if the pores are less than 5μm, not only the emulsion penetration channel of the non-stick filler is narrow and affects the filling effect, but also the emulsion of the non-stick filler must overcome the additional pressure caused by the surface tension when penetrating into the pores, affecting the penetration effect; if the pores are greater than 150μm, the porous hard skeleton is relatively loose, although the emulsion penetration of the non-stick filler becomes easier, but the overall structural strength of the porous hard skeleton decreases, and the porous hard skeleton is easily destroyed. Among them, the emulsion of the non-stick filler can be infiltrated into the pores of the porous skeleton by vortex, ultrasound or negative pressure. It should be noted that in the same composite non-stick coating product, the width of the pores at different positions is different, as long as the width of the pores is between 5μm and 150μm.

[0034] According to an embodiment of the present invention, the composite non-stick coating has a thickness of 1 mm in any cross section or longitudinal section. 2 In the region, the protruding area is S 凸 , the area of ​​the concave part is S 凹 , then S 凸 and S 凹 Satisfaction: S 凸 / S 凹 =2~19 (for example, S 凸 / S 凹 =2, S凸 / S 凹 =3, S 凸 / S 凹 =4, S 凸 / S 凹 =5, S 凸 / S 凹 =6, S 凸 / S 凹 =7, S 凸 / S 凹 =8, S 凸 / S 凹 =9, S 凸 / S 凹 =10, S 凸 / S 凹 =11, S 凸 / S 凹 =12, S 凸 / S 凹 =13, S 凸 / S 凹 =14, S 凸 / S 凹 =15, S 凸 / S 凹 =16, S 凸 / S 凹 =17, S 凸 / S 凹 =18, S 凸 / S 凹 =19). 凸 / S 凹 The ratio of S affects the non-stick and wear resistance of the composite non-stick coating. 凸 and S 凹 The ratio range can well meet the requirements of non-stickiness and wear resistance of composite non-stick coating when it is used in cookware; when S 凸 / S 凹 When S is less than 2, the hard skeleton of the protruding part accounts for too small a proportion, the wear resistance of the composite non-stick coating is relatively poor, and the composite non-stick coating is easily worn during cooking and cleaning; when S 凸 / S 凹 When it is greater than 19, the non-stick filler in the concave part accounts for too small a proportion, the non-stick property of the composite non-stick coating is relatively poor, and it is relatively difficult to clean.

[0035] It should be noted that in the same composite non-stick coating product, the composite non-stick coating has different 1mm in different cross sections or longitudinal sections. 2 In the area, S 凸 / S 凹 The values ​​can be the same or different. If different, they can be between 2 and 19.

[0036] According to an embodiment of the present invention, the thermal conductivity of the composite non-stick coating is 5 to 14 W / mK, such as 5 W / mK, 6 W / mK, 7 W / mK, 8 W / mK, 9 W / mK, 10 W / mK, 11 W / mK, 12 W / mK, 13 W / mK, and 14 W / mK. The composite non-stick coating of the above structure of the present invention still has good thermal conductivity, ensuring good heating performance of the cookware.

[0037] According to an embodiment of the present invention, the hard skeleton is a metal-based skeleton, a ceramic-based skeleton or a metal / ceramic-based skeleton. The hard skeletons of the above materials have good wear resistance and thermal conductivity, meeting the use requirements of the cookware.

[0038] Furthermore, the metal-based skeleton is an iron-based alloy material, including iron and auxiliary raw materials, and the auxiliary raw materials include at least one of chromium, nickel, boron, silicon, carbon, molybdenum and oxygen. Therefore, the main element is Fe, which has a low cost, and has good thermal conductivity and wear resistance, which can well meet the use requirements of pots. In addition, Fe has been used to make cookers since ancient times, and has good user acceptance; adding Cr and Ni can help improve the corrosion resistance of the composite non-stick coating to solve the problem that iron pots are easy to rust; C, B, and Si can form a high-hardness ceramic phase with Fe to improve the hardness of the material; O can form a Cr2O3 protective film with Cr, which is also conducive to improving the corrosion resistance of the composite non-stick coating. In some embodiments, the iron-based alloy material includes iron and auxiliary raw materials, and the auxiliary raw materials include chromium and boron, wherein the mass content of boron (B) is 0.5% to 6%. If the content of B exceeds 6%, it will over-consume the Cr element in the iron-based alloy, reduce the corrosion resistance of the iron-based alloy, and then reduce the corrosion resistance of the metal skeleton.

[0039] According to an embodiment of the present invention, the non-stick filler is an organic non-stick material or an inorganic non-stick material containing fluorine or silicon, such as PTFE (polytetrafluoroethylene), PFA (a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene), fluorosilane, siloxane, etc. Therefore, the non-stick filler is a low surface energy infiltrate, a nanometer or ultra-fine micrometer-level super-hydrophobic medium, and the non-stick filler can ensure unimpeded passage through the smallest pore size in the hard skeleton.

[0040] In another aspect of the present invention, the present invention provides a cooker. Figure 3 The cookware comprises: a cookware body 20; the composite non-stick coating 10 described above, and the composite non-stick coating 10 is arranged on the inner surface of the cookware body 20. As a result, the cookware has good wear resistance and non-stick properties, which improves the performance and user experience of the cookware. Those skilled in the art can understand that the cookware has all the features and advantages described above, and no further elaboration is given here. Among them, the inner surface refers to the surface of the cookware body close to the cooking space.

[0041] According to an embodiment of the present invention, referring to Figure 4 The cookware further comprises a transition layer 30, which is located on at least part of the inner surface of the cookware body 20, and the composite non-stick coating 10 is located on at least part of the surface of the transition layer 30 away from the cookware body 20. The provision of the transition layer can further improve the bonding strength between the composite non-stick coating 10 and the cookware body 20, thereby further improving the overall structural stability of the cookware and extending the service life of the cookware.

[0042] According to an embodiment of the present invention, the transition layer is a porous structure, and the transition layer of the porous structure can be an integrated structure with the hard skeleton, thereby better ensuring the integrity of the hard skeleton and the transition layer, thereby improving the structural stability of the cookware. In some embodiments, the hard skeleton and the transition layer can be prepared by the same method and the same material, for example, both are prepared by thermal spraying, so that the hard skeleton and the transition layer can be prepared by a single process, and during the preparation, only certain process parameters need to be adjusted, so that the connectivity between the hard skeleton and the transition layer is stronger, which can further improve the bonding strength between the two and the bonding strength between the layers.

[0043] In some embodiments, the transition layer is a porous structure, and the porosity of the transition layer is 1% to 20%, wherein the porosity of the transition layer can be 1%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, etc., and the porosity of the transition layer is less than or equal to the porosity of the hard skeleton. As a result, the porous structure is denser than the hard skeleton, which can further improve the bonding strength between the composite non-stick coating and the cookware body, and can also further improve the corrosion resistance of the composite non-stick layer. Furthermore, in the direction close to the hard skeleton, the porosity of the transition layer gradually increases (for example, it can gradually increase from a porosity of 1% to the porosity of the hard skeleton), that is, the structure on the side close to the cookware body is denser, which can further improve the bonding strength between the composite non-stick coating and the cookware body, and can also further improve the corrosion resistance of the composite non-stick layer.

[0044] In another aspect of the present invention, the present invention provides a cooking utensil. The cooking utensil comprises the above-mentioned pot. Thus, the cooking utensil has good wear resistance and non-stick properties, thereby improving the performance of the cooking utensil and the user experience.

[0045] According to the embodiments of the present invention, there are restrictions on the specific types of cooking equipment, and technical personnel in this field can flexibly choose according to actual needs. For example, the cooking equipment can be an electric rice cooker (the pot constitutes the inner pot of the electric rice cooker), a pressure cooker (the pot constitutes the inner pot of the pressure cooker), a wok, a milk pan, a frying pan, or the like.

[0046] Example

[0047] Example

[0048] The composite non-stick coating includes: a hard skeleton and a non-stick filler, the hard skeleton has pores, any cross section of the hard skeleton has a plurality of concave-convex structures, and there is a height difference between the convex part and the concave part of the concave-convex structure; the non-stick filler is filled in the pores, wherein the thickness of the composite non-stick coating is 200 microns, the hard skeleton is an iron-based alloy material, and the non-stick filler is fluorosilane. Different embodiments also respectively meet the parameter conditions shown in Table 2 below, and the wear resistance and non-stick properties of the composite non-stick coating obtained in each embodiment are tested, and the test results of each embodiment are evaluated according to Table 1. The specific test method is as follows:

[0049] Abrasion resistance test method:

[0050] 1) After cleaning the cooking utensils, fix them on the wear tester, set the frequency to 33 times / min, apply a downward force of 15N, use a scouring pad (3M7447B) with a length of 70mm±5mm and a width of 30mm±5mm, and move back and forth a distance of 100mm;

[0051] 2) Start the test machine, replace the scouring pad every 500 times and observe with a 10x magnifying glass. If the non-stick surface has a scratch of more than 1 mm on the exposed substrate or 10 linear scratches of more than 2 mm in length expose the substrate, stop the test;

[0052] 3) Record the number of cycles N, based on the total number of cycles before terminating the test.

[0053] Non-stick test method:

[0054] 1) Pour an appropriate amount of vegetable oil into the cooking utensil, and wipe the non-stick surface with a soft cloth until it is evenly coated; wash it with warm water above 60°C and neutral detergent, then rinse with clean water and wipe dry;

[0055] 2) Place the cooking utensil on an electric ceramic stove with a rated voltage of 220V and an output power of 1kW to heat it. Use a surface thermometer with an accuracy of not less than 2.5 to measure. When the surface temperature of the inner coating reaches 150℃~170℃, break a fresh egg and put it into the cooking utensil until the egg white is basically coagulated (during the entire cooking process, the surface temperature of the inner coating shall not exceed 210℃);

[0056] 3) Use a plastic spatula with a cutting edge thickness of 0.2mm to 0.5mm to completely remove the egg. If there is any egg residue attached, gently remove it with a wet sponge or gauze;

[0057] 4) Repeat steps 3) and 4) for a total of 3 times and observe.

[0058] Table 1 Evaluation of the non-stickiness test results of fried eggs

[0059]

[0060] Table 2 Parameter conditions of each embodiment

[0061] Height difference Porosity <![CDATA[S 凸 / S 凹 Value]]> Wear resistance Non-stick Example 1 5μm~50μm 28％ 1～4 80,000 times Level I Example 2 5μm~50μm 20％ 2～16 100,000 times Level I Example 3 5μm~50μm 8％ 5～18 250,000 times Level II Example 4 5μm~50μm 10％ 2～19 220,000 times Level II Example 5 5μm~50μm 15％ 2～19 160,000 times Level II Example 6 5μm~50μm 4％ 17～25 300,000 times Grade III Example 7 2μm~8μm 5％ 2～19 280,000 times Grade III Example 8 45μm~60μm 30％ 2～19 50,000 times Grade III

[0062] Note: Porosity = S 凹 / (S 凸 +S 凹 ), so the porosity is related to S 凸 / S 凹 The value is related, S 凸 / S 凹 The larger the value, the lower the porosity.

[0063] Results analysis of each embodiment:

[0064] 1. S 凸 / S 凹 The value is too low, indicating that the hard skeleton in the protruding part of the porous skeleton accounts for too little, so the porosity of the surface composite coating increases with S 凸 / S 凹 Since the pores are filled with non-stick fillers, they have good non-stick properties. Therefore, in Examples 1 and 2, S 凸 / S 凹 The value is low, while the porosity is high. The wear resistance of the composite non-stick coating is 80,000-100,000 times, with relative deviation, and the non-stickiness is better, which is Level Ⅰ.

[0065] 2. Example 3, Example 4 and Example 5, S 凸 / S 凹 The value is medium and the porosity is medium, indicating that the proportion of hard skeleton in the protruding part of the porous skeleton is further increased, resulting in the non-stick property of the composite non-stick coating being level II. As the porosity increases (from 8% to 15%), the wear resistance of the composite non-stick coating decreases (from 250,000 times to 160,000 times).

[0066] 3. Example 6, S 凸 / S 凹 The value is too high, indicating that the hard skeleton in the protruding parts of the porous skeleton accounts for too large a proportion, and the non-stick filler in the recessed parts accounts for too small a proportion. The non-stickiness of the composite non-stick coating is relatively poor (non-stickiness is level III), but the wear resistance is greatly improved (300,000 times).

[0067] 4. Example 7: The height difference is low, and the non-stick filler in the concave part is shallow. In the continuous wear test, the scouring pad has a certain flexibility and will extend into the concave part to wear the non-stick filler. The non-stickiness is relatively poor (non-stickiness is level III).

[0068] 5. Example 8: The height difference is too high and the depth of the recessed part is too large, which results in that the non-stick filler cannot be fully filled. There is a phenomenon that only a part of the surface recessed part is filled with the non-stick filler, and the non-stickiness is relatively poor (non-stickiness is level III).

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0070] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A composite non-stick coating, characterized in that: include: A hard skeleton, wherein the hard skeleton has pores, and any cross section of the hard skeleton has a plurality of concave-convex structures, and a height difference exists between the convex parts and the concave parts of the concave-convex structures; A non-stick filler is filled in the pores.

2. The composite non-stick coating according to claim 1, characterized in that: The raw material for forming the hard skeleton is hard particles, the particle size of the hard particles is R, and the height difference is 1 / 10R to 1 / 2R.

3. The composite non-stick coating according to claim 1, characterized in that: The height difference is 5 μm to 50 μm.

4. The composite non-stick coating according to claim 2, characterized in that: The hard skeleton is formed by a thermal spraying process.

5. The composite non-stick coating according to claim 1, characterized in that: The composite non-stick coating has a thickness of 1 mm in any cross section or longitudinal section. 2 In the region, the protruding area is S 凸 The area of ​​the concave portion is S 凹 , then S 凸 and S 凹 Satisfaction: S 凸 / S 凹 =2~19.

6. The composite non-stick coating according to claim 5, characterized in that: The thermal conductivity of the composite non-stick coating is 5-14 W / mK.

7. The composite non-stick coating according to any one of claims 1 to 6, characterized in that: The pores are connected in the hard skeleton.

8. The composite non-stick coating according to claim 7, characterized in that: The porosity of the hard skeleton is 5% to 30%.

9. The composite non-stick coating according to any one of claims 1 to 6, characterized in that: The hard skeleton is a metal-based skeleton, a ceramic-based skeleton or a metal / ceramic-based skeleton.

10. The composite non-stick coating according to claim 9, characterized in that: The metal-based skeleton is an iron-based alloy material, including iron and auxiliary raw materials, wherein the auxiliary raw materials include at least one of chromium, nickel, boron, silicon, carbon, molybdenum and oxygen, wherein the mass content of boron is 0.5% to 6%.

11. A cookware, characterized in that: include: The cooker body; The composite non-stick coating according to any one of claims 1 to 10, wherein the composite non-stick coating is arranged on the inner surface of the cookware body.

12. The cookware according to claim 11, characterized in that: The cookware further comprises a transition layer, wherein the transition layer is located on at least a portion of the inner surface of the cookware body, and the composite non-stick coating is located on at least a portion of the surface of the transition layer away from the cookware body.

13. The cookware according to claim 12, characterized in that: The transition layer is a porous structure, and the porosity of the transition layer is 1% to 20%. The porosity of the transition layer is smaller than the porosity of the hard skeleton.

14. A cooking utensil, characterized in that: The invention comprises the cookware according to any one of claims 11 to 13.

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