Non-stick pan and method of making same

Abstract

The application discloses a non-stick pot and a manufacturing method thereof, and belongs to the technical field of non-stick pots. The method comprises the following steps: a. providing a pot body, and pretreating the surface of the pot body; b. adopting plasma spraying technology to perform plasma spraying on the surface of the pretreated pot body, so as to obtain the non-stick pot. The non-stick pot comprises an electromagnetic induction layer, a base material layer and a plasma spraying layer. The plasma spraying layer is a titanium silicon nitride layer or a titanium iron nitride layer. The porosity of the titanium silicon nitride layer is 5-10%. The surface of the non-stick pot prepared by the method has numerous tiny concaves and convexes, has excellent wear resistance, is not easy to be damaged, can keep the pot durable and non-sticky, and prolongs the service life of the pot.

Description

Technical Field

[0001] This invention belongs to the field of non-stick pan technology, specifically relating to a non-stick pan and its manufacturing method. Background Technology

[0002] Non-stick pans have become widely accepted in most households. Their non-stick function makes cooking easy, even for beginners like young people. Non-stick pans used in daily life are mainly divided into coated and uncoated types, achieving the same non-stick effect. Coated pans make up the majority of the market. Coated non-stick pans on the market have a PTFE organic coating sprayed onto the surface of the pan base. The coating achieves non-stick properties because it has a low coefficient of friction. Although PTFE coatings are now fully compliant with food safety standards thanks to advancements in non-stick coating technology, they are prone to peeling off, requiring replacement every 1-2 years. Furthermore, peeling coatings can pose a health risk.

[0003] Uncoated nonstick pans achieve their nonstick properties due to their high surface hardness and special surface structure; the world's first 0-coating nonstick pan is based on Lotus Nano's lotus leaf biomimetic design. TM After non-stick treatment, the Vickers hardness is 1000-1300, which is 6 times that of stainless steel and 40 times that of aluminum pots. The physical non-stick structure of the pot is not easily damaged and can withstand the test of metal spatulas and steel wool, achieving long-lasting non-stick performance and fully meeting consumers' requirements for wear resistance and durability of cookware. Summary of the Invention

[0004] The purpose of this invention is to provide a cookware with a surface having countless tiny bumps and depressions, which has excellent wear resistance, is not easily damaged, and allows the cookware to maintain its non-stick properties for a long time, thus extending the service life of the cookware.

[0005] The technical solution adopted by the present invention to achieve the above objectives is as follows:

[0006] A non-stick pan, comprising an electromagnetic induction layer, a substrate layer, and a plasma spray coating layer;

[0007] The aforementioned plasma spray coating is a titanium nitride silicon layer or a titanium nitride iron layer;

[0008] The porosity of the aforementioned titanium nitride silicon layer is 5-10%.

[0009] This invention is based on plasma spraying technology, using titanium nitride and silicon nitride as materials to form a substrate surface with micro-undulations on the cookware surface. The titanium nitride silicon layer or titanium nitride iron layer is hard and exhibits many tiny pores, achieving a non-stick effect through a water-repellent, lotus-leaf-like surface. Simultaneously, the non-stick cookware of this invention has low porosity and high hardness and bonding strength, solving the problem of easy coating peeling. This invention also has a high water contact angle, providing anti-fouling properties, and excellent wear resistance, making it less prone to damage and ensuring the cookware maintains its non-stick properties for a long time, extending its service life.

[0010] It should be noted that, as a preferred embodiment of the present invention, the titanium nitride silicon layer is made of titanium nitride and silicon nitride and is obtained by plasma spraying technology.

[0011] It should be further noted that, as a preferred embodiment of the present invention, the weight ratio of titanium nitride to silicon nitride is 15-30:10-20.

[0012] It should be noted that, as a preferred embodiment of the present invention, the thickness of the titanium nitride silicon layer is greater than 30 μm.

[0013] It should be further noted that, as a preferred embodiment of the present invention, the thickness of the titanium nitride silicon layer is 30-50 μm.

[0014] It should be noted that, as a preferred embodiment of the present invention, the surface of the non-stick pan has an uneven shape.

[0015] This invention also discloses a method for manufacturing a non-stick pan, comprising the following steps:

[0016] a. Provide the pot body and pre-treat the surface of the pot body;

[0017] b. Plasma spraying technology is used to coat the pretreated pot surface to obtain a non-stick pot.

[0018] It should be noted that, as a preferred embodiment of the present invention, in the plasma spraying technology, the heat source is a plasma arc driven by a 45-60KW DC power source.

[0019] It should be noted that, as a preferred embodiment of the present invention, the working temperature in the plasma spraying technology is 1800-3000K and the air pressure is 0.5-0.7MPa.

[0020] It should be noted that, as a preferred embodiment of the present invention, in the plasma spraying technology, the working gas is argon and / or hydrogen and / or nitrogen; the flow rate of argon is 80-120 L / M, the flow rate of hydrogen is 25-40 L / M, the flow rate of nitrogen is 25-40 L / M, and the velocity of the working gas is 120-180 m / s.

[0021] This invention is based on plasma spraying technology, using titanium nitride and silicon nitride as materials to form a substrate surface with micro-uneven textures on the cookware surface. The titanium nitride silicon layer or titanium nitride iron layer is hard and exhibits numerous tiny pores, achieving a non-stick effect through a hydrophobic, lotus leaf-like surface. Simultaneously, the non-stick cookware of this invention has low porosity and high hardness and bonding strength, solving the problem of easy coating peeling. This invention also has a high water contact angle, providing anti-fouling properties, and excellent wear resistance, making it difficult to damage and maintaining its non-stick properties for a long time, thus extending its service life. Therefore, this invention provides a cookware with a surface featuring countless micro-uneven textures, excellent wear resistance, and resistance to damage, enabling it to maintain its non-stick properties for a long time and extending its service life. Attached Figure Description

[0022] Figure 1 For example, La2(Hf) in Example 4 0.6 Ce 0.4 XRD pattern of O2O7 powder;

[0023] Figure 2 The porosity of the non-stick pan surface;

[0024] Figure 3 The hardness of the non-stick pan surface;

[0025] Figure 4 The wear rate of the non-stick pan surface;

[0026] Figure 5 The bonding strength of the non-stick pan surface;

[0027] Figure 6 The water contact angle of a non-stick pan surface;

[0028] Figure 7 This is an overall picture of the non-stick pan;

[0029] Figure 8 This is a schematic diagram of the structure of a non-stick pan;

[0030] Figure 9 This is a schematic diagram of the structure of the plasma spray coating on a non-stick pan. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the pot body material used in this invention is selected from pot body materials commonly used in this technical field; iron-based materials or aluminum-based materials.

[0033] It should be noted that the non-stick pan of the present invention includes a plasma spray coating layer, a substrate layer, and an electromagnetic induction layer; the plasma spray coating layer is titanium iron nitride or titanium silicon nitride; such as Figure 7 , 8 As shown.

[0034] It should be further noted that the plasma-sprayed coating, when magnified, is not flat, but rather composed of countless tiny bumps and depressions, exhibiting a hydrophobic effect similar to that of a lotus leaf; for example... Figure 9 As shown.

[0035] According to the non-stick pan manufacturing method of the present invention, in the plasma spraying technology, the heat source is a plasma arc driven by 45-60KW DC power; preferably a plasma arc driven by 50-60KW DC power.

[0036] According to a method for manufacturing a non-stick pan according to the present invention, in the plasma spraying technology, the working temperature is 1800-3000K and the gas pressure is 0.5-0.7MPa; the working temperature is preferably 2000-3000K and the gas pressure is preferably 0.5-0.6MPa, so as to heat the titanium nitride and silicon nitride powders to a molten or semi-molten state.

[0037] According to the non-stick pan manufacturing method of the present invention, in the plasma spraying technology, the working gas is argon and / or hydrogen and / or nitrogen; the flow rate of argon is 80-120 L / M, the flow rate of hydrogen is 25-40 L / M, and the flow rate of nitrogen is 25-40 L / M; specifically, the flow rate of argon is preferably 100 L / M, the flow rate of hydrogen is preferably 30 L / M, and the flow rate of nitrogen is preferably 30 L / M.

[0038] According to the non-stick pan manufacturing method of the present invention, in the plasma spraying technology, the spraying distance is 10-25mm; preferably 15-20mm.

[0039] This invention also provides a method for plasma spraying titanium nitride and silicon nitride onto the surface of a pot body, followed by spraying La2(Hf) x Ce 1-x )2O7, where the value of x is 0.4-0.8, forms a tightly bonded wear-resistant material, while significantly improving the non-stick properties of the pot body.

[0040] It should be noted that La2(Hf) x Ce 1-x The amount of 2O7 (where x is 0.4-0.8) used is 5-10 wt% of titanium nitride.

[0041] Preferably, the present invention provides a method for manufacturing a non-stick pan, the specific steps of which are as follows:

[0042] a. Provide the pot body, clean the surface of the pot body, and remove surface oil, oxides and impurities;

[0043] b. The pretreated pot surface is coated with titanium nitride and silicon nitride using plasma spraying technology. The titanium nitride and silicon nitride are mixed uniformly at a weight ratio of 15-30:10-20. The heat source is a 45-60KW DC-driven plasma arc, with a working temperature of 1800-3000K and a gas pressure of 0.5-0.7MPa. The titanium nitride and silicon nitride are heated to a molten or semi-molten state. The working gases are argon, hydrogen, and nitrogen; the argon flow rate is 80-120L / M, the hydrogen flow rate is 25-40L / M, and the nitrogen flow rate is 25-40L / M. The working gas velocity is 180-260m / s, and the spraying distance is 10-25mm. Then, La2(Hf) 1- x Ce x )2O7 powder is heated to a molten or semi-molten state and then plasma sprayed. The working gases are argon, hydrogen, and nitrogen. The flow rate of argon is 80-120 L / M, the flow rate of hydrogen is 25-40 L / M, the flow rate of nitrogen is 25-40 L / M, the velocity of the working gases is 120-180 m / s, the spraying distance is 10-25 mm, the spraying time is 100-150 s, and the coating thickness is 30-50 μm, resulting in a non-stick pan.

[0044] This invention also provides La2(Hf) x Ce 1-x The preparation method of 2O7 includes the following steps:

[0045] Lanthanum salt, hafnium salt, and cerium salt were dissolved in distilled water in a specific ratio and magnetically stirred until homogeneous. Ammonia was then added and stirred until homogeneous again. The pH of the system was controlled, and the mixture was filtered. The solution was repeatedly washed with distilled water and anhydrous ethanol until neutral. After drying, the solution was sintered at high temperature to obtain La2(Hf)2. x Ce 1-x )2O7 powder, where the value of x is 0.4-0.8.

[0046] According to the present invention, La2(Hf) x Ce 1-x The preparation method of 2O7 involves a molar ratio of lanthanum, hafnium, and cerium in lanthanum salt, hafnium salt, and cerium salt of 1:x:1-x, where x is 0.4-0.8; preferably 0.6.

[0047] According to the present invention, La2(Hf) x Ce 1-x Preparation method of La2(Hf)2O7, La2(Hf)2O7 x Ce 1-xThe high-temperature sintering curve of 2O7 is as follows: the temperature is increased from room temperature to 500-650℃ at a heating rate of 1.5-2.5℃ / min, held for 1-2 hours, and then increased to 1150-1350℃ at a heating rate of 3-4℃ / min, held for 1-2 hours.

[0048] According to the present invention, La2(Hf) x Ce 1-x The preparation method of La2O7 involves dissolving lanthanum salt, hafnium salt, and cerium salt in distilled water at a molar ratio of lanthanum, hafnium, and cerium of 1:x:1-x at 70-90℃, stirring magnetically until homogeneous, then slowly adding concentrated ammonia water, stirring until homogeneous, controlling the pH of the system to 9-10, filtering, and repeatedly washing the precipitate with distilled water and anhydrous ethanol until neutral, drying it in an oven at 100-150℃ for 18-24 hours, and sintering at high temperature to obtain La2(Hf)2O7. x Ce 1-x )2O7 powder, where the value of x is 0.4-0.8.

[0049] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings:

[0050] Example 1:

[0051] A method for making a non-stick pan, the specific steps are as follows:

[0052] a. Provide a pot body substrate (aluminum material), polish the surface of the pot body with 800-mesh silicon carbide sandpaper, then repeatedly clean it three times with petroleum ether, anhydrous ethanol and deionized water to remove surface oil and oxide impurities, then rinse the pot body with ultrapure water, and blow dry the surface of the pot body with high-pressure nitrogen gas with a purity of 99% to obtain the pre-treated pot body.

[0053] b. Using plasma spraying technology, titanium nitride and silicon nitride are sprayed onto the pretreated pot surface. The titanium nitride and silicon nitride are mixed evenly at a weight ratio of 15:20. The heat source is a 55KW DC-driven plasma arc, the working temperature is 2000K, and the gas pressure is 0.6MPa. The titanium nitride and silicon nitride are heated to a molten or semi-molten state. The working gases are argon, hydrogen, and nitrogen. The flow rate of argon is 100L / M, the flow rate of hydrogen is 30L / M, the flow rate of nitrogen is 30L / M, the velocity of the working gases is 140m / s, the spraying distance is 15mm, the spraying time is 140s, and the coating thickness is 35μm, resulting in a non-stick pot.

[0054] Example 2:

[0055] A method for manufacturing a non-stick pan, which differs from Example 1 in that:

[0056] In step b, titanium nitride and silicon nitride are sprayed onto the pretreated pot surface using plasma spraying technology. The titanium nitride and silicon nitride are mixed evenly at a weight ratio of 30:20. The heat source is a 55KW DC-driven plasma arc, the working temperature is 2000K, and the gas pressure is 0.6MPa. The titanium nitride and silicon nitride are heated to a molten or semi-molten state. The working gases are argon, hydrogen, and nitrogen. The flow rate of argon is 100L / M, the flow rate of hydrogen is 30L / M, the flow rate of nitrogen is 30L / M, the velocity of the working gases is 140m / s, the spraying distance is 15mm, the spraying time is 140s, and the coating thickness is 35μm, resulting in a non-stick pot.

[0057] Example 3:

[0058] A method for manufacturing a non-stick pan, which differs from Example 1 in that:

[0059] In step b, titanium nitride and silicon nitride are sprayed onto the pretreated pot surface using plasma spraying technology. The titanium nitride and silicon nitride are mixed evenly at a weight ratio of 15:20. The heat source is a 55KW DC-driven plasma arc, the working temperature is 3000K, and the gas pressure is 0.7MPa. The titanium nitride and silicon nitride are heated to a molten or semi-molten state. The working gases are argon, hydrogen, and nitrogen. The flow rate of argon is 100L / M, the flow rate of hydrogen is 30L / M, the flow rate of nitrogen is 30L / M, the velocity of the working gases is 160m / s, the spraying distance is 20mm, the spraying time is 100s, and the coating thickness is 40μm, resulting in a non-stick pot.

[0060] Example 4:

[0061] A La2(Hf) x Ce 1-x The preparation method of 2O7 includes:

[0062] LaCl3·6H2O, HfCl4, and CeCl3·6H2O were dissolved in distilled water at a molar ratio of lanthanum, hafnium, and cerium of 1:0.6:0.4 at 80℃. The solution was magnetically stirred until homogeneous. Then, concentrated ammonia solution was slowly added and stirred until homogeneous. The pH of the system was controlled at 9.5, and a precipitate was formed. The precipitate was filtered using a vacuum filter and repeatedly washed with distilled water and anhydrous ethanol until neutral. It was then dried in an oven at 120℃ for 20 hours and sintered at high temperature. The sintering curve was as follows: the temperature was increased from room temperature to 550℃ at a rate of 1.5℃ / min, held for 1 hour, and then increased to 1300℃ at a rate of 3.5℃ / min, held for 1 hour, and then cooled to room temperature to obtain La2(HfCl4)2·6H2O. 0.6 Ce 0.4 )2O7 powder.

[0063] Example 5:

[0064] A method for manufacturing a non-stick pan, which differs from Example 1 in that:

[0065] In step b, titanium nitride and silicon nitride are sprayed onto the pretreated pot surface using plasma spraying technology. The titanium nitride and silicon nitride are mixed uniformly at a weight ratio of 15:20. The heat source is a 55KW DC-driven plasma arc, the working temperature is 2000K, and the gas pressure is 0.6MPa. The titanium nitride and silicon nitride are heated to a molten or semi-molten state. The working gases are argon, hydrogen, and nitrogen; the argon flow rate is 100L / M, the hydrogen flow rate is 30L / M, the nitrogen flow rate is 30L / M, the working gas velocity is 140m / s, the spraying distance is 15mm, and the spraying time is 140s. Then, the La2(Hf)2 from Example 1 is sprayed onto the surface. 0.6 Ce 0.4 2O7 powder (5wt% of titanium nitride) is heated to a molten or semi-molten state and then plasma sprayed. The working gases are argon, hydrogen, and nitrogen. The flow rate of argon is 110 L / M, the flow rate of hydrogen is 25 L / M, the flow rate of nitrogen is 35 L / M, the velocity of the working gases is 180 m / s, the spraying distance is 15 mm, and the coating thickness is 35 μm, resulting in a non-stick pan.

[0066] Example 6:

[0067] A method for manufacturing a non-stick pan, which differs from Example 1 in that: the La2(Hf) in Example 1... 0.6 Ce 0.4 The amount of 2O7 powder used is 10 wt% of titanium nitride.

[0068] Example 7:

[0069] The preferred embodiment of the non-stick pan manufacturing method of the present invention further includes: uniformly mixing titanium nitride, silicon nitride and FeNiMoZn alloy, and performing plasma spraying to form numerous tiny concave and convex shapes on the surface of the pan, which has better hardness and wear resistance, and also improves the non-stick performance of the pan.

[0070] Furthermore, the weight ratio of titanium nitride, silicon nitride and FeNiMoZn is 15-30:10-20:5-10.

[0071] A method for manufacturing a non-stick pan, which differs from Example 1 in that:

[0072] In step b, titanium nitride, silicon nitride, and FeNiMoZn are sprayed onto the pretreated pot surface using plasma spraying technology. The titanium nitride, silicon nitride, and FeNiMoZn are mixed uniformly in a weight ratio of 15:20:5. The heat source is a 55KW DC-driven plasma arc, the working temperature is 2000K, and the gas pressure is 0.6MPa. The titanium nitride, silicon nitride, and FeNiMoZn are heated to a molten or semi-molten state. The working gases are argon, hydrogen, and nitrogen. The flow rate of argon is 100L / M, the flow rate of hydrogen is 30L / M, the flow rate of nitrogen is 30L / M, the velocity of the working gases is 140m / s, the spraying distance is 15mm, the spraying time is 140s, and the coating thickness is 35μm, resulting in a non-stick pot.

[0073] Example 8:

[0074] A method for manufacturing a non-stick pan, which differs from Example 7 in that:

[0075] In step b, titanium nitride, silicon nitride and FeNiMoZn are sprayed onto the pretreated pot surface using plasma spraying technology, wherein the weight ratio of titanium nitride, silicon nitride and FeNiMoZn is 15:20:10.

[0076] Example 9:

[0077] A method for manufacturing a non-stick pan, which differs from Example 1 in that:

[0078] In step b, titanium nitride is sprayed onto the pretreated pot surface using plasma spraying technology. The heat source is a 55KW DC-driven plasma arc, the working temperature is 2000K, and the gas pressure is 0.6MPa. The titanium nitride is heated to a molten or semi-molten state. The working gases are argon, hydrogen, and nitrogen. The flow rate of argon is 100L / M, the flow rate of hydrogen is 30L / M, the flow rate of nitrogen is 30L / M, the velocity of the working gases is 140m / s, the spraying distance is 15mm, the spraying time is 140s, and the coating thickness is 35μm, resulting in a non-stick pot.

[0079] Example 10:

[0080] A method for manufacturing a non-stick pan, which differs from Example 1 in that:

[0081] In step b, silicon nitride is sprayed onto the pretreated pot surface using plasma spraying technology. The heat source is a 55KW DC-driven plasma arc, the working temperature is 2000K, and the gas pressure is 0.6MPa. The silicon nitride is heated to a molten or semi-molten state. The working gases are argon, hydrogen, and nitrogen. The flow rate of argon is 100L / M, the flow rate of hydrogen is 30L / M, the flow rate of nitrogen is 30L / M, the velocity of the working gases is 140m / s, the spraying distance is 15mm, the spraying time is 140s, and the coating thickness is 35μm, resulting in a non-stick pot.

[0082] Experimental Example 1:

[0083] 1.La2(Hf 0.6 Ce 0.4 Crystal phase testing of O2O7 powder

[0084] The obtained La2(Hf) was analyzed using an X-ray diffractometer. 0.6 Ce 0.4 XRD analysis was performed on Cu-Kα ray, with a 2θ scanning range of 10-80° and a scanning speed of 10° / min.

[0085] Figure 1 For example, La2(Hf) in Example 4 0.6 Ce 0.4 XRD pattern of 2O7 powder; from Figure 1 As can be seen, this invention uses lanthanum salt, hafnium salt, and cerium salt to prepare La2(Hf) by high-temperature sintering. 0.6 Ce 0.4 )2O7 powder; the crystalline phase is relatively pure, with no obvious other impurity peaks.

[0086] 2. Non-stick pan surface performance test

[0087] (1) Non-stick pan surface porosity test

[0088] In accordance with the requirements of GB / T 3365-2008, an electron scanning microscope was used to photograph any eight areas of the non-stick pan surface. After adjusting the threshold using image processing software, the porosity of the coating was calculated.

[0089] Figure 2 The porosity of the non-stick pan surface; by Figure 2It can be seen that the porosity of the non-stick pan surface in Examples 1-3 is 5-8%. Comparing Examples 1 and 9-10, the porosity of the non-stick pan surface in Example 1 is lower than that in Examples 9-10. This indicates that simultaneously spraying titanium nitride and silicon nitride onto the pan surface to form titanium silicon nitride reduces its porosity, resulting in better density of the non-stick pan surface. The porosity of the non-stick pan surface in Examples 5-6 is less than 4%, which is better than that in Example 1. This indicates that titanium nitride and silicon nitride are first sprayed onto the surface of the pan substrate, and then La2(Hf) is sprayed on top. 0.6 Ce 0.4 )2O7, which further improves the density of non-stick pans.

[0090] Figure 2 It also shows that the porosity of the non-stick pan surface in Examples 7-8 is less than 5%, which is also lower than that in Example 1. This indicates that mixing titanium nitride, silicon nitride and FeNiMoZn alloy evenly and spraying them together on the pan surface reduces the porosity of the pan surface and improves the density of the non-stick pan.

[0091] (2) Mechanical property testing

[0092] According to GB / T 4340.1-2009 standard, the surface of the pot was measured using an HV-1000 digital microhardness tester with a load of 250gf and a loading time of 20s. The coating hardness value was calculated by the diagonal length of the indentation.

[0093] Figure 3 The hardness of the non-stick pan surface; by Figure 3 It can be seen that the surface hardness of the non-stick pans in Examples 1-3 is higher than 4000 Hv. Comparing Examples 1 and Examples 9-10, the surface hardness of the non-stick pan in Example 1 is higher than that in Examples 9-2, indicating that the simultaneous spraying of titanium nitride and silicon nitride onto the pan surface to form titanium nitride silicon increases the hardness of the non-stick pan. The surface hardness of the non-stick pans in Examples 5-6 is higher than 4500 Hv, which is higher than that in Example 1, indicating that titanium nitride and silicon nitride are first sprayed onto the surface of the pan substrate, and then La2(Hf) is sprayed on. 0.6 Ce 0.4 )2O7, which further improves the hardness of non-stick pans.

[0094] (3) Wear resistance test

[0095] Friction and wear tests were conducted on the surface of the pot body using a friction and wear testing machine. Cast steel balls with a diameter of 6 mm were selected as the grinding balls. Under room temperature conditions, the load was 10 N, the speed was 75 mm / s, the wear time was 1.5 h, and the wear track length was 15 mm. The wear rate was calculated using the following formula:

[0096] B = V / (F·S)

[0097] In the formula: B is the volumetric wear rate of the sample, in mm. 3 / (N·m); V is the wear volume of the sample, mm 3 F is the normal force, N; S is the total sliding distance, m.

[0098] Figure 4 The wear rate of the non-stick pan surface; by Figure 4 It can be seen that the wear rate of the non-stick pan surface in Examples 1-3 is less than 2.5 × 10⁻⁶. -5 mm 3 / (N·m), comparing Example 1 with Examples 9-10, the wear rate of the non-stick pan surface in Example 1 is lower than that in Examples 9-10, indicating that spraying titanium nitride and silicon nitride onto the pan surface to form titanium silicon nitride reduces the wear rate of the non-stick pan and gives it better wear resistance; the wear rate of the non-stick pan surface in Examples 5-6 is less than 1.8×10 -5 mm 3 / (N·m), lower than Example 1, indicating that titanium nitride and silicon nitride were first sprayed onto the surface of the pot body substrate, and then La2(Hf) was sprayed. 0.6 Ce 0.4 )2O7 improves the wear resistance of non-stick pans.

[0099] Figure 4 It was also shown that the wear rate of the non-stick pan surface in Examples 7-8 was less than 2.0 × 10⁻⁶. -5 mm 3 / (N·m), lower than Example 1, indicates that uniformly mixing titanium nitride, silicon nitride and FeNiMoZn alloy and spraying them together on the surface of the pot further reduces the wear rate of the pot surface and improves the wear resistance of the non-stick pot.

[0100] (4) Combined with strength performance test

[0101] The non-stick pan surface sample after plasma spraying and the sandblasted tie rod were cleaned. The coated rod and tie rod were bonded and fixed on the same axis using E-7 adhesive. A force of 35N was applied in the oven, and the pan was cured at 120℃ for 4 hours, followed by static pressure for 24 hours. After cooling to room temperature, the bonding strength of the non-stick pan surface coating was calculated.

[0102] Figure 5 The bonding strength of the non-stick pan surface; by Figure 5It can be seen that the bonding strength of the non-stick pan surface in Examples 1-3 is higher than 40 MPa. Comparing Examples 1 and 9-10, the bonding strength of the non-stick pan surface in Example 1 is higher than that in Examples 9-10, indicating that spraying titanium nitride and silicon nitride onto the pan surface to form a titanium nitride-silicon layer improves the bonding strength of the non-stick pan surface coating. The bonding strength of the non-stick pan surface in Examples 5-6 is higher than 50 MPa, which is higher than that in Example 1, indicating that titanium nitride and silicon nitride are first sprayed onto the pan substrate surface, and then La2(Hf) is sprayed on. 0.6 Ce 0.4 The addition of titanium nitride, silicon nitride and FeNiMoZn alloy improves the bonding strength between the non-stick pan and the surface coating. In addition, the bonding strength of the non-stick pan surface in Examples 7-8 is higher than 45 MPa, which is higher than that in Example 1. This indicates that the uniform mixing of titanium nitride, silicon nitride and FeNiMoZn alloy and spraying them together on the pan surface further improves the bonding strength between the non-stick pan and the surface coating.

[0103] (5) Water contact angle test

[0104] The water contact angle of a non-stick pan surface was determined using an optical contact angle / interfacial tension instrument and the stop-drop method.

[0105] Figure 6 The water contact angle of the non-stick pan surface; by Figure 6 It can be seen that the water contact angle of the non-stick pan surface in Examples 1-3 is higher than 155°. Comparing Examples 1 and 9-10, the water contact angle of the non-stick pan surface in Example 1 is higher than that in Examples 9-10. This indicates that spraying titanium nitride and silicon nitride onto the pan surface to form a titanium nitride-silicon layer improves the water contact angle of the non-stick pan surface coating, giving it better hydrophobic properties and a better lotus leaf hydrophobic effect. The water contact angle of the non-stick pan surface in Examples 5-6 is higher than 160°, which is higher than that in Example 1. This indicates that titanium nitride and silicon nitride are first sprayed onto the pan substrate surface, and then La2(Hf) is sprayed on top. 0.6 Ce 0.4 )2O7 increases the water contact angle between the non-stick pan and the surface coating, giving the non-stick pan excellent anti-fouling properties.

[0106] (6) Non-stick performance test

[0107] Clean the non-stick pan with water and dry it. Apply a thin layer of cooking oil to the bottom of the pan, ensuring there are no oil droplets or residue on the surface. Crack an egg into the heated non-stick pan and wait for the egg white to solidify. Remove the egg and observe the egg residue on the bottom of the pan to evaluate its non-stick properties.

[0108] Table 1. Non-stick properties of non-stick pans

[0109] Example 1 No residue, the inner surface of the pot is clean and smooth. Example 2 No residue, the inner surface of the pot is clean and smooth. Example 3 No residue, the inner surface of the pot is clean and smooth. Example 4 No residue, the inner surface of the pot is clean and smooth. Example 5 No residue, the inner surface of the pot is clean and smooth. Example 6 No residue, the inner surface of the pot is clean and smooth. Example 7 No residue, the inner surface of the pot is clean and smooth. Example 8 No residue, the inner surface of the pot is clean and smooth. Example 9 No residue, the inner surface of the pot is clean and smooth. Example 10 No residue, the inner surface of the pot is clean and smooth.

[0110] As can be seen from Table 1, the non-stick pan prepared by the present invention has good non-stick properties and is easy to clean.

[0111] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for manufacturing a non-stick pan, wherein the non-stick pan comprises an electromagnetic induction layer, a substrate layer, and a plasma spraying layer; characterized in that: The plasma spray coating is a titanium nitride silicon layer and La2(Hf)2. x Ce 1-x The titanium nitride silicon layer is 2O7, where x is 0.4 to 0.8; the porosity of the titanium nitride silicon layer is 5 to 10%, and the thickness of the titanium nitride silicon layer is greater than 30 μm; the titanium nitride silicon layer is made of titanium nitride and silicon nitride. The manufacturing method includes the following steps: a. Provide a pot body and pre-treat the surface of the pot body; b. The pretreated pot surface is plasma-sprayed with titanium nitride and silicon nitride, followed by La2(Hf) coating. x Ce 1-x Titanium nitride and silicon nitride are mixed to obtain a non-stick pan; the weight ratio of titanium nitride to silicon nitride is 15-30:10-20. La2(Hf x Ce 1-x The preparation method of La2O7 includes: dissolving lanthanum salt, hafnium salt, and cerium salt in distilled water at a molar ratio of lanthanum, hafnium, and cerium of 1:x:1-x, stirring magnetically until homogeneous, then slowly adding concentrated ammonia water, stirring until homogeneous, controlling the pH of the system to 9-10, filtering, washing the obtained precipitate repeatedly with distilled water and anhydrous ethanol until neutral, drying in an oven at 100-150℃ for 18-24 hours, and sintering to obtain La2(Hf)2O7. x Ce 1-x )2O7 powder.

2. The method for manufacturing a non-stick pan according to claim 1, characterized in that: In the plasma spraying technology, the heat source is a plasma arc driven by a 45-60KW DC power source.

3. The method for manufacturing a non-stick pan according to claim 1, characterized in that: In the plasma spraying technology, the working temperature is 1800-3000K and the air pressure is 0.5-0.7MPa.

4. The method for manufacturing a non-stick pan according to claim 1, characterized in that: In the plasma spraying technology, the working gas is one or more of argon, hydrogen, and nitrogen.

5. A non-stick pan prepared by the method of manufacturing a non-stick pan according to any one of claims 1 to 4.

6. The non-stick pan according to claim 5, characterized in that: The surface of the non-stick pan has an uneven shape.

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