A non-stick pan with a fusion layer and a method of manufacturing the same

Abstract

The application provides a non-stick pot, comprising a pot body base material and a spray layer covering the inner surface of the pot body base material, the pot body base material is formed into a side wall and a bottom wall through stretching or die casting, the spray layer is formed through high-speed multi-particle stacking by a spray gun, and the spray layer comprises a side spray layer covering the side wall of the pot body base material and a bottom spray layer covering the bottom wall of the pot body base material; the bottom spray layer comprises a reinforced spray layer area located in the central area of the bottom wall of the pot body base material and a peripheral transition spray layer area; the thickness of the spray layer in the reinforced spray layer area is greater than the thickness of the spray layer in the transition spray layer area, and the equivalent diameter of the reinforced spray layer area covering the central area of the pot body base material is less than 25 mm. The non-stick pot provided by the application is subjected to the reinforcement treatment of increasing the thickness of the spray layer in the central area of the bottom wall of the pot body base material, thereby being not easy to fall off, prolonging the service life, being not easy to be burnt, and simultaneously considering the uniformity of the thickness of the spray layer in a large area of the pot body base material and the reinforcement effect of the spray layer in the central area of the bottom wall.

Description

A non-stick pan with a melt-sprayed coating and its manufacturing method Technical Field

[0001] This invention relates to the field of cooking utensil technology, and in particular to a non-stick pan with a melt-blown layer and its manufacturing method. Background Technology

[0002] Woks are common cooking utensils in the kitchen. Non-stick pans are widely accepted and recognized by consumers because they allow food to avoid sticking during processing and are easy to clean. Common non-stick pans rely on fluoropolymer coatings, such as polytetrafluoroethylene (PTFE), to form a non-stick coating to achieve the non-stick function. Newer non-stick pans containing titanium-plated layers have become emerging kitchen utensils due to their better durability and non-stick effect.

[0003] However, many non-stick pans currently on the market suffer from poor wear resistance and durability of the non-stick coating. Existing technologies have proposed various solutions to improve these problems. For example, patent CN217137473U provides a non-stick cookware in which the thickness of the sprayed layer on its main spray surface gradually decreases from the center to the edge. However, this design results in uneven thickness of the bottom wall, which is detrimental to improving its impact resistance. Patent CN218164854U provides a cookware with a sprayed coating, where the thickness of the sprayed layer on a larger main spray surface is 0.2–0.8 mm. However, the thicker sprayed layer increases the cost of producing the cookware and is not conducive to lightweight use, thus reducing the user experience.

[0004] Meanwhile, the spraying process of the non-stick cookware's coating layer needs improvement to optimize its structure and performance. During the spraying process, the speed of the sprayed particles is extremely high, typically reaching 200-300 m / s, far exceeding the rotation speed of the cookware and the speed of the spray gun. Therefore, the inner surface of the cookware substrate is in a state of multi-particle overlap. Consequently, in actual production, issues with the process often lead to localized missed areas or uneven thickness, affecting the density of the wear-resistant layer and resulting in insufficient wear resistance or cracking due to thermal shock. Patent CN110623550A provides a surface spraying process for aluminum cast iron cookware. This process uses a spiral upward spraying method during arc spraying, which is complex to operate and makes it difficult to control the uniformity of the coating. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a cookware with a significantly improved impact resistance and a non-stick coating that is not easily detached, as well as a method for manufacturing the same.

[0006] On one hand, this application provides a non-stick pan with a sprayed coating, comprising a pan body substrate and a sprayed coating covering the inner surface of the pan body substrate. The pan body substrate is formed into side walls and a bottom wall by stretching or die casting. The sprayed coating is formed by high-speed multi-particle deposition through a spray gun. The sprayed coating includes a side sprayed coating covering the side walls of the pan body substrate and a bottom sprayed coating covering the bottom wall of the pan body substrate.

[0007] The bottom spray layer includes a reinforced spray layer area located in the central region of the bottom wall of the pot body substrate and a transitional spray layer area on the periphery. The thickness of the spray layer in the reinforced spray layer area is greater than the thickness of the spray layer in the transitional spray layer area, and the equivalent diameter of the reinforced spray layer area covering the central region of the pot body substrate is less than 25 mm.

[0008] Non-stick pans with the above-mentioned structural design have a thickened and reinforced molten layer in a small central area of ​​the bottom wall of the cookware substrate. This increases the hardness of the central area, making it less prone to peeling and extending its service life. At the same time, it also prevents food from sticking to the pan due to localized high temperatures in the center of the bottom, thus improving the user experience.

[0009] Furthermore, the design of a reinforced molten lamination layer with an equivalent diameter of less than 25mm allows for a balance between the uniformity of the molten lamination layer thickness over a larger area of ​​the cookware substrate and the enhanced effect of the molten lamination layer in the central area of ​​the bottom wall. On one hand, a uniformly thick molten lamination layer offers superior wear resistance and impact crack resistance, and its uniform color improves the user experience. On the other hand, while a thicker reinforced molten lamination layer provides better hardness and is less prone to peeling, an excessively large reinforced molten lamination layer area is not conducive to cost reduction and lightweight cookware, and it is also difficult to adapt to the heating method of common kitchen stoves, where the central temperature is high and the surrounding temperature is relatively low.

[0010] In one embodiment, the thickness of the sprayed layer in the enhanced sprayed layer region is 80–100 μm, and the thickness of the sprayed layer in the transition sprayed layer region is 50–80 μm.

[0011] A melt-blown layer of the aforementioned thickness can significantly improve impact resistance while avoiding the problem of high-temperature cracking that can easily occur with excessive thickness.

[0012] Optionally, the lower and / or upper limit of the thickness of the sputtering layer in the enhanced sputtering layer region can be selected from 80μm, 81μm, 82μm, 83μm, 84μm, 85μm, 86μm, 87μm, 88μm, 89μm, 90μm, 91μm, 92μm, 93μm, 94μm, 95μm, 96μm, 97μm, 98μm, 99μm, and 100μm.

[0013] Optionally, the lower and / or upper limit of the thickness of the melt-cast layer in the transition melt-cast layer region can be selected from 50μm, 51μm, 52μm, 53μm, 54μm, 55μm, 56μm, 57μm, 58μm, 59μm, 60μm, 61μm, 62μm, 63μm, 64μm, 65μm, 66μm, 67μm, 68μm, 69μm, 70μm, 71μm, 72μm, 73μm, 74μm, 75μm, 76μm, 77μm, 78μm, 79μm, and 80μm.

[0014] On the other hand, this application also provides a method for manufacturing the above-mentioned non-stick pan, the method including the step of spraying a melt-coated layer of particles onto a rotating pan substrate, wherein the spraying path of the melt-coated layer particles is as follows:

[0015] It moves from the upper edge of the side wall of the pot body substrate to the center of the bottom wall, and then from the center of the bottom wall to the upper edge of the side wall; or

[0016] It moves from the upper edge of the side wall of the pot body substrate toward the center of the bottom wall and beyond the center distance d, and then returns to the upper edge of the side wall.

[0017] Preferably, the spraying path of the melt-blown layer particles can be achieved by controlling the movement path of the spray gun in specific process operations.

[0018] Preferably, the spray gun moves in a straight line.

[0019] The processing and manufacturing method provided in this application significantly improves the density of the melt-painted layer on the inner surface of the pot substrate by having the melt-painted layer particles reciprocate between the upper edge of the side wall and the center of the bottom wall. Furthermore, the melt-painted layer thickness in the central region is greater than that in the surrounding region within a certain range, thereby significantly improving the wear resistance, thermal shock resistance, and crack resistance of the non-stick layer in the non-stick pan. The method of moving the particles beyond the center distance d and then returning ensures that the melt-painted layer in the central region is fully melt-painted, preventing unmelted areas and further avoiding problems such as easy cracking of the melt-painted layer.

[0020] In one embodiment, the rotation speed of the pot body substrate is x revolutions per minute, and the spraying speed of the melt spray layer particles is v meters per second, where v < x / 6000.

[0021] In one embodiment, the rotational speed x of the pot body substrate is in the range of 100 < x < 250.

[0022] The above parameter settings stipulate that the time for the cookware substrate to rotate once is less than the time for the sprayed particle beam to travel one diameter distance. This can further ensure the density of the sprayed layer at the edge of the cookware substrate and improve the consistency of the overall sprayed layer of the cookware substrate.

[0023] In one embodiment, the spraying speed of the melt-sprayed layer particles gradually increases from the upper edge of the side wall of the pot substrate towards the center of the bottom wall, and then gradually decreases from the center of the bottom wall towards the upper edge of the side wall.

[0024] It is understandable that, based on the fact that the linear velocity of the bottom wall center of the cookware substrate is the smallest and the linear velocity of the upper edge of the side wall is the largest during the rotation of the cookware substrate, the above parameters can be set to match the spraying process with the rotation speed of the cookware substrate, thereby improving the uniformity of the melt spray layer.

[0025] In one embodiment, the moving speed at the center of the bottom wall of the pot body substrate is greater than 0.1 m / s.

[0026] The above parameters are set so that the thickness of the formed melt-sprayed layer is less than or equal to 100μm, thereby ensuring the wear resistance of the melt-sprayed layer on the inner surface of the cookware substrate.

[0027] In one embodiment, the distance d beyond the center satisfies: 0 ≤ d ≤ 10 mm.

[0028] The above parameter settings can avoid the problem of insufficient density of the center sprayed layer on the bottom wall of the cookware substrate due to inaccurate tooling positioning or shaking. An appropriate distance d can also prevent the center sprayed layer from being too thick, which would make it easy to crack when heated. At the same time, it can also improve the density of the center sprayed layer area on the bottom wall.

[0029] In one embodiment, the spraying path of the melt-blown layer particles, when passing through the center of the bottom wall of the pot substrate, has a travel area not exceeding πd. 2 Return after shaping.

[0030] Preferably, the shape includes a triangle, a circle, or a square.

[0031] The above path parameters ensure the integrity and density of the sprayed particles covering the central area of ​​the bottom wall of the cookware substrate, thereby improving its hardness and impact resistance.

[0032] In one embodiment, in addition to the melting and spraying step, the non-stick pan manufacturing method provided in this application also includes other conventional process steps for non-stick pan manufacturing, such as polishing, sandblasting, and oiling, which can be completed using conventional steps.

[0033] In one embodiment, the spraying method of the sprayed layer particles includes flame spraying, arc spraying, or plasma spraying.

[0034] In one embodiment, the material of the pot body substrate is selected from at least one of iron, iron alloy, aluminum, aluminum alloy, copper, and copper alloy; and / or,

[0035] The material of the molten layer particles is selected from at least one of titanium, titanium alloy, chromium, or stainless steel.

[0036] Optionally, the particle size of the melt-blown layer particles is 170–300 μm.

[0037] Optionally, the non-stick pan provided in this application can be used in woks, and / or the inner pots of electric pressure cookers and rice cookers.

[0038] This application has at least the following beneficial effects:

[0039] 1. The non-stick pan provided in this application has a thickened and reinforced coating layer in a small area at the center of the bottom wall of the cookware substrate, which makes it less prone to peeling off, extends its service life, and makes it less likely to burn food, thus improving the user experience. It can also simultaneously ensure the uniformity of the coating layer thickness over a larger area of ​​the cookware substrate and the reinforcement effect of the coating layer in the center area of ​​the bottom wall.

[0040] 2. The non-stick pan manufacturing method provided in this application makes the thickness of the melt-painted layer in the central area of ​​the inner surface of the pan body substrate greater than that in the surrounding area, and the overall density of the melt-painted layer is significantly improved, thereby significantly improving the non-stick effect of the non-stick layer in the non-stick pan as well as its wear resistance, resistance to thermal shock and crack resistance. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] In the attached diagram:

[0044] Figure 1 is a structural schematic diagram of one embodiment of the non-stick pan provided in this application.

[0045] Figure 2 is a schematic diagram of one embodiment of the melt spraying path from a top view of a non-stick pan;

[0046] Figure 3 is a schematic diagram of one embodiment of the melt spraying path from a top view of a non-stick pan;

[0047] Figure 4 is a schematic diagram of one embodiment of the melt spraying path from a top view of a non-stick pan;

[0048] In the picture:

[0049] 1: Side wall of cookware substrate; 101: Upper edge of side wall; 2: Bottom wall of cookware substrate; 201: Reinforced spray layer area; 202: Transition spray layer area; 3: Spray particle beam; 4: Spray path; Arrow a: Rotation direction of cookware substrate; Arrows b1, b2: Movement path of spray gun. Detailed Implementation

[0050] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0051] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0052] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0055] Unless otherwise specified, in the following embodiments, reagents or instruments whose manufacturers are not indicated are all conventional products that can be purchased commercially.

[0056] Unless otherwise specified in the examples, the conditions shall be performed according to the standard conditions or the conditions recommended by the manufacturer.

[0057] Example 1: Non-stick cookware

[0058] This embodiment provides a non-stick cookware that can be used in woks and / or the inner pots of electric pressure cookers and rice cookers, preferably woks.

[0059] As shown in Figure 1, the non-stick pan includes a pan body substrate and a sprayed layer covering the inner surface of the pan body substrate. The pan body substrate is formed into side walls 1 and bottom walls 2 by stretching or die casting. The top of the side wall 1 of the pan body substrate has an upper edge 101. The sprayed layer is formed by the deposition of high-speed multi-particles sprayed from a spray gun, including a side sprayed layer covering the side walls 1 of the pan body substrate and a bottom sprayed layer covering the bottom walls 2 of the pan body substrate.

[0060] Referring again to Figure 1, the bottom spray layer includes a reinforced spray layer area 201 located in the central area of ​​the bottom wall of the pot body substrate and a peripheral transition spray layer area 202. The thickness of the spray layer in the reinforced spray layer area 201 is greater than the thickness of the spray layer in the transition spray layer area 202, and the equivalent diameter of the reinforced spray layer area 201 covering the central area of ​​the pot body substrate is less than 25 mm.

[0061] Preferably, the thickness of the molten layer in the reinforced molten layer region 201 is 80–100 μm, and the thickness of the molten layer in the transition molten layer region 202 is 50–80 μm. Molten layers of this thickness can significantly improve impact resistance while avoiding the problem of high-temperature cracking that can easily occur with excessive thickness.

[0062] In one embodiment of the non-stick pan provided in this example, the molten coating layer on the inner surface of the bottom wall 2 of the pan substrate is of uniform thickness and flat. That is, the thickness of the molten coating layer in the reinforced molten coating layer region 201 and the thickness of the molten coating layer in the transition molten coating layer region 202 are both 80μm. The molten coating layer with uniform thickness has better wear resistance and impact crack resistance and other excellent properties. In addition, the color is uniform in appearance, which is conducive to improving the user experience.

[0063] In another embodiment, the molten layer in a smaller central area of ​​the bottom wall 2 of the cookware substrate undergoes a thickening and strengthening treatment to increase the hardness of the central area of ​​the bottom wall 2, making it less prone to peeling off and extending its service life. Simultaneously, it prevents food from burning due to localized high temperatures in the center of the pot bottom, improving the user experience. Furthermore, the setting of the reinforced molten layer area 201 with an equivalent diameter of less than 25mm allows for a balance between the uniformity of the molten layer thickness over a larger area of ​​the cookware substrate and the strengthening effect of the molten layer in the central area of ​​the bottom wall. On the one hand, a large area of ​​uniformly thick molten layer maintains better wear resistance and impact crack resistance, and has a uniform color appearance, which is beneficial to improving the user experience; on the other hand, although a thicker reinforced molten layer area 201 has better hardness and is less prone to peeling off, an excessively large reinforced molten layer area is not conducive to reducing costs and making the cookware lighter, and it is difficult to adapt to the heating method of common kitchen stoves where the central temperature is high and the surrounding temperature is relatively low.

[0064] Example 2: Processing and manufacturing method of non-stick cookware

[0065] This embodiment provides a method for manufacturing the non-stick pan as described in Embodiment 1. The method includes at least the step of spraying a sprayed layer of particles onto a rotating cookware substrate.

[0066] The material of the pot body substrate is selected from at least one of iron, iron alloy, aluminum, aluminum alloy, copper and copper alloy, preferably cast iron; the material of the sprayed layer particles is selected from at least one of titanium, titanium alloy, chromium or stainless steel, preferably titanium powder.

[0067] In one embodiment, the spraying method for the sprayed layer particles is selected from flame spraying, arc spraying, or plasma spraying. Specifically, spraying raw material powder with a particle size of 170μm to 300μm is mixed and then fed into a spray gun. The mixed powder is thermally sprayed onto the inner wall of the cookware substrate at a power of approximately 40kW. After cooling, the liquid spraying raw material mixture solidifies on the inner surface of the cookware substrate, forming a sprayed layer.

[0068] Referring to Figure 2, in one embodiment, the spraying path of the melt-sprayed layer particles is as follows: moving in a straight line from the upper edge 101 of the side wall of the pot substrate to the center of the bottom wall 2, and then moving in a straight line from the center of the bottom wall 2 back to the upper edge 101 of the side wall. As shown in Figure 2, arrow a indicates the rotation direction of the pot substrate. Under the rotation of the pot substrate, the spraying path of the melt-sprayed layer particle beam 3 moving in a straight line is shown as marked 4 in Figure 2.

[0069] Referring to Figure 3, in another embodiment, in order to avoid inaccurate tooling positioning or shaking leading to insufficient density of the central spray layer, the spraying path of the spray layer particles can be as shown in Figure 3: moving in a straight line from the upper edge 101 of the side wall of the pot substrate to the center point of the bottom wall 2, exceeding the distance d at the center point, and then moving in a straight line from the distance d back to the upper edge 101 of the side wall.

[0070] Preferably, the distance d beyond the center satisfies: 0 ≤ d ≤ 10 mm. At this distance d, the problem of insufficient density of the center sprayed layer on the bottom wall of the cookware substrate due to inaccurate tooling positioning or shaking of the cookware substrate can be avoided. In addition, an appropriate distance d can also prevent the center sprayed layer from being too thick, which would make it prone to cracking when heated, and at the same time improve the density of the center sprayed layer area on the bottom wall.

[0071] Preferably, in the embodiment shown in Figure 3, when the spraying path of the melt-blown layer particles passes through the center point of the bottom wall 2 of the pot substrate, the travel path can be an area not exceeding πd. 2 Return to the original shape as shown in Figure 4.

[0072] Referring to Figure 4, the path shape of the spray gun in the central area of ​​the bottom wall can be triangular, circular, or square. As shown in Figure 4, it is a triangle, and the area does not exceed the area of ​​a circle with radius d. This ensures the integrity and density of the sprayed particles covering the central area of ​​the bottom wall of the cookware substrate, improving its hardness and impact resistance.

[0073] It is understandable that the diameter of a typical molten particle beam is about 10 mm. For better explanation, the molten layer particle beam 3 shown in Figures 2-4 is schematically enlarged.

[0074] In a preferred embodiment, the spray gun for applying the molten coating particles moves at a speed greater than 0.1 m / s at the center of the bottom wall 2 of the cookware substrate. This ensures that the thickness of the formed molten coating is less than or equal to 100 μm, thereby guaranteeing the wear resistance of the molten coating on the inner surface of the cookware substrate.

[0075] Preferably, in the spraying process provided in this embodiment, since the spraying speed of the particles being sprayed is extremely high, generally between 200 and 300 m / s, which is much greater than the rotation speed of the cookware substrate and the moving speed of the spray gun, the surface of the cookware substrate is in a state of multiple particle overlap, and the linear velocity is high at the edge of the pot. To ensure the density of the sprayed layer, especially at the edge of the pot, and to improve the consistency of the overall sprayed layer of the cookware, the rotation speed of the cookware substrate is set to x (revolutions per minute), and the moving speed of the spray gun is set to v (meters per second), and v is specified to be less than x / 6000 (meters per second), that is, the time for the cookware substrate to rotate once is less than the time for the particle beam to travel one diameter distance. The value of x ranges from 100 to x to 250 (revolutions per minute).

[0076] Preferably, in the melt spraying process provided in this embodiment, based on the fact that the linear velocity of the bottom wall center of the cookware substrate is the smallest and the linear velocity of the upper edge of the side wall is the largest during the rotation of the cookware substrate, the spraying speed of the melt spraying layer particles is set to gradually increase from the upper edge 101 of the side wall of the cookware substrate to the center area of ​​the bottom wall 2, and then gradually decrease from the center area of ​​the bottom wall 2 to the upper edge 101 of the side wall. This allows the spraying process to match the rotation speed of the cookware substrate, thereby improving the uniformity of the melt spraying layer.

[0077] Optionally, the manufacturing method provided in this embodiment also includes steps such as polishing, sandblasting, and oiling. Specific exemplary steps are as follows:

[0078] Step 1) First polishing: Use a scouring pad or sandpaper to polish the inner surface of the cookware to remove oil and impurities from the surface of the cookware.

[0079] Step 2) Sandblasting: Using a high-speed stream of sand to impact the surface of the cookware substrate, making the roughness of the cookware substrate Ra2.0μm~10μm;

[0080] Step 3) Melt spraying: Mix melt spraying raw material powder with a particle size of 170μm to 300μm and pass it into the melt spraying gun. At a power of about 40kw, the mixed powder is thermally sprayed onto the inner wall of the cookware substrate. After the liquid melt spraying raw material mixture cools, it solidifies on the inner surface of the nitrided layer of the cookware substrate to form a melt spraying layer.

[0081] Step 4) Secondary polishing: Use a scouring pad or sandpaper to polish the inner surface of the nitrided layer to make the surface roughness of the nitrided layer Ra 1.5μm~Ra 3.0μm.

[0082] Step 5) Clean and oil.

[0083] Example 3 Performance Test

[0084] Using the manufacturing method provided in this embodiment, a series of non-stick pan products were prepared by varying the parameters of the spray gun speed along the pan edge, the spray gun speed at the center, the distance of the spray gun across the center, and the path of the center point. These products are designated as Examples 1# to 4#. Pans prepared using the unoptimized parameter method were set as comparative examples, designated as D1# to D6#. The performance of the non-stick pan products in the examples and comparative examples was tested using the following methods:

[0085] 1. Long-lasting non-stick

[0086] After cleaning, the sample was fixed on the abrasion tester. A downward force of 30N was applied at a frequency of 33 cycles / min using a 70mm ± 5mm long and 30mm ± 5mm wide scouring pad (3M7447B) with a back-and-forth movement distance of 100mm. The scouring pad was replaced every 500 cycles, and the sample was observed using a 10x magnifying glass. After the cycle count was completed, the non-stick properties were tested. The non-stick property test method followed the test method in section 4.2.1 of GB / T32095.2-2015 "Specifications for the Performance and Testing of Non-stick Surfaces of Household Food Metal Cooking Utensils Part 2: Non-stick and Abrasion Resistance Test Specifications". The requirements were: 5001 cycles, stickiness grade II.

[0087] 2. Thermal shock

[0088] The sample is dry-heated in an induction cooker or gas stove until the surface temperature reaches 400℃, then immediately immersed in room temperature water for 50 cycles. The requirement is that the molten layer does not crack.

[0089] The process parameters and final test results of the non-stick cookware prepared in each example are shown in Table 1. The rotation speed of the cookware is 100 < x < 250 (rpm), the sample uses a conventional rotation speed of 150 rpm, the movement speed at the center of the pot edge is v < 0.025 (m / s) and the movement speed is > 0.1 (m / s); 0 ≤ d ≤ 10 mm.

[0090] Table 1

[0091]

[0092] As shown in Table 1, in the processing and manufacturing method provided in this application, parameters such as the speed of the spray gun along the edge of the pan, the speed of the spray gun at the center, the distance of the spray gun across the center, and the path of the center point have a significant impact on the appearance, non-stick properties, and resistance to thermal shock of the final non-stick pan. Compared with the comparative example before parameter optimization, the non-stick pan produced by the processing and manufacturing method provided in Example 2 has a more uniform color, maintains Grade I non-stick performance after 25,000 cycles, and remains uncracked after 50 thermal cycles. Furthermore, the processing and manufacturing method provided in this application is simple to operate, highly industrially applicable, and has broad market application prospects.

[0093] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A non-stick pan with a sprayed coating, comprising a pan body substrate and a sprayed coating covering the inner surface of the pan body substrate, wherein the pan body substrate is formed into side walls and a bottom wall by stretching or die casting, and the sprayed coating is formed by the deposition of high-speed multi-particles sprayed from a spray gun, characterized in that, The non-stick pan coating includes a side coating layer covering the sidewalls of the pan substrate and a bottom coating layer covering the bottom wall of the pan substrate. The bottom coating layer includes a reinforced coating layer area located in the central region of the bottom wall of the pan substrate and a surrounding transition coating layer area. The thickness of the coating layer in the reinforced coating layer area is greater than the thickness of the coating layer in the transition coating layer area, and the equivalent diameter of the reinforced coating layer area covering the central region of the pan substrate is less than 25 mm. The manufacturing method of the non-stick pan includes the step of spraying coating layer particles onto a rotating pan substrate. The rotation speed of the pot body substrate is x revolutions / minute, and the spraying speed of the molten spray layer particles is v meters / second, where v < x / 6000. The rotation speed x of the pot body substrate ranges from 100 to x < 250. The method includes the step of spraying molten spray layer particles onto the rotating pot body substrate. The spraying path of the molten spray layer particles is as follows: moving from the upper edge of the side wall of the pot body substrate towards the center of the bottom wall and exceeding the center by a distance d, and then returning to the upper edge of the side wall. The distance d exceeding the center satisfies: 0 ≤ d ≤ 10 mm.

2. The non-stick pan according to claim 1, characterized in that, The thickness of the sprayed layer in the enhanced sprayed layer region is 80~100μm, and the thickness of the sprayed layer in the transition sprayed layer region is 50~80μm.

3. The non-stick pan according to claim 1, characterized in that, The spraying speed of the particles in the melt-sprayed layer gradually increases from the upper edge of the side wall of the pot substrate towards the center of the bottom wall, and then gradually decreases from the center of the bottom wall towards the upper edge of the side wall.

4. The non-stick pan according to claim 3, characterized in that, The moving speed at the center of the bottom wall of the pot body substrate is greater than 0.1 m / s.

5. The non-stick pan according to claim 1, characterized in that, The spraying method for the particles of the sprayed layer includes flame spraying, arc spraying, or plasma spraying.

6. The non-stick pan according to claim 1, characterized in that, The material of the pot body substrate is selected from at least one of iron, iron alloy, aluminum, aluminum alloy, copper and copper alloy; and / or, the material of the sprayed layer particles is selected from at least one of titanium, titanium alloy, chromium or stainless steel.

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