Functional coating for inner container of steaming and baking all-in-one machine, forming method and steaming and baking all-in-one machine

Abstract

The invention belongs to the technical field of non-stick coatings, and particularly relates to a functional coating for an inner container of a steaming and baking all-in-one machine, a forming method and the steaming and baking all-in-one machine, the functional coating comprises a meltallizing layer formed on the surface of a base material through a meltallizing process and a non-stick layer formed on the surface of the meltallizing layer, the meltallizing layer is made of a chromium oxide-aluminum oxide composite material, and the non-stick layer is made of a silicon oxide-aluminum oxide composite material. By arranging the meltallizing layer, the problem of liner deformation caused by sand blasting can be solved, and the wear resistance of the functional coating can be further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-stick coatings, and in particular relates to a functional coating for an inner pot of an all-in-one steam-and-bake machine, a forming method and the all-in-one steam-and-bake machine. Background Art

[0002] The steam-bake combination machine can provide more diverse cooking options and can complete a variety of cooking tasks such as baking, grilling, steaming, etc. It has also been widely promoted and applied in recent years.

[0003] Steam ovens are usually used in high temperature and heavy oily environments. In order to enhance the cooking performance of steam ovens, improve the cooking experience, and solve the problem of difficult cleaning of the inner pot, Teflon coatings and ceramic coatings are used as non-stick coatings for the inner pot in the prior art.

[0004] However, there are still some problems to be solved with these existing non-stick coatings: in order to increase the adhesion between these coatings and the inner pot substrate, it is often necessary to sandblast the inner pot substrate first, and the sandblasting process causes the inner pot to deform, thereby affecting the subsequent formation of the non-stick coating. Summary of the invention

[0005] The present invention aims to provide a functional coating for the inner pot of an all-in-one steam-bake machine, a forming method and the all-in-one steam-bake machine, which solves the problem of sandblasting deformation on the surface of the inner pot of an all-in-one pot in the prior art.

[0006] The first aspect of the present invention provides a functional coating for the inner pot of a steam-bake combination machine, wherein a sprayed layer is formed on the surface of the inner pot substrate of the steam-bake combination machine by spraying, and the composition of the sprayed layer is a composite component of chromium oxide and aluminum oxide, which can solve the problem of deformation of the inner pot. Moreover, the selection of the sprayed layer is also beneficial to improving the wear resistance of the surface.

[0007] The first aspect of the present invention adopts the following technical solution:

[0008] A functional coating for the inner pot of a steam-bake combination machine comprises a sprayed layer formed on the surface of a substrate by a spraying process and a non-stick layer formed on the surface of the sprayed layer, wherein the sprayed layer is composed of a chromium oxide-aluminum oxide composite material.

[0009] As described in the background art, sandblasting on the liner substrate may cause deformation of the liner, which in turn may affect the subsequent coating of the functional coating and related functions, such as wear resistance.

[0010] In this solution, the sprayed layer formed on the surface of the substrate by the spraying process replaces the sand layer formed by the sandblasting process, which can not only overcome the deformation problem of the inner pot, but also ensure the ideal adhesion performance of the non-stick coating formed on the surface. Moreover, by selecting the composition of the sprayed layer, it can be matched with the non-stick coating to give the inner pot better wear resistance. In addition, the sprayed layer uses a composite material of chromium oxide and aluminum oxide, which has good thermal conductivity, can help achieve uniform heating, so that the food is heated more evenly, thereby making the non-stick coating have a better anti-stick effect.

[0011] Preferably, the composite mass ratio of chromium oxide to aluminum oxide is 8:1-3, for example, 8:1, 8:1.2, 8:1.5, 8:2, 8:2.5, 8:2.8, 8:3.

[0012] Further preferably, the composite mass ratio of chromium oxide to aluminum oxide is 4:1.

[0013] Preferably, the thickness of the sprayed layer is 30 μm to 100 μm, for example, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm.

[0014] Preferably, the roughness Ra of the sprayed layer is 0.5 μm to 5 μm, for example, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, or 5 μm.

[0015] Preferably, a wire drawing surface is formed on the surface of the substrate, and the sprayed layer is formed on the wire drawing surface.

[0016] Preferably, the drawing depth of the drawing surface is 30 μm to 100 μm, for example, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm.

[0017] Preferably, the substrate is a stainless steel substrate.

[0018] Further preferably, the substrate is 304 stainless steel.

[0019] A second aspect of the present invention provides a method for forming the above-mentioned functional coating, comprising the following steps:

[0020] S1. Pre-treatment: degreasing and degreasing the inner tank workpiece;

[0021] S2. Forming a spraying layer: plasma spraying spraying material to form a spraying layer, the flame velocity is 200 to 1200 m / s, and the particle velocity is 30 to 800 m / s;

[0022] S3. Post-processing: sandpaper polishing, cleaning, drying;

[0023] S4. Forming a non-stick coating: electrostatically spraying a non-stick coating to form a non-stick coating.

[0024] A third aspect of the present invention provides an inner pot of a steam-bake machine, comprising the above-mentioned functional coating for the inner pot of a steam-bake machine.

[0025] By implementing the above technical solution, the present invention has the following beneficial effects:

[0026] 1. The present invention can avoid deformation of the stainless steel substrate under the sandblasting process by providing a spraying layer instead of sandblasting; and the spraying layer adopts a composite material of chromium oxide and aluminum oxide. The spraying layer formed can cooperate with the non-stick coating to improve wear resistance, resist scratches and abrasion, especially under conditions of frequent use.

[0027] 2. The sprayed layer is made of a composite material of chromium oxide and aluminum oxide, which has good thermal conductivity and can help achieve uniform heating, so that the food is heated more evenly, thereby making the non-stick coating have a better anti-stick effect, reducing the possibility of food adhesion, improving cooking quality, and also facilitating cleaning.

[0028] 3. The sprayed layer can also enhance the mechanical strength of the substrate itself, making it more durable. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] The present embodiment provides a functional coating for the inner pot of a steam-bake combination machine, comprising a sprayed layer formed on the surface of a substrate by a spraying process and a non-stick layer formed on the surface of the sprayed layer, the substrate adopts a 304 stainless steel substrate, the sprayed layer is composed of a composite material of chromium oxide and aluminum oxide, and the mass ratio of chromium oxide to aluminum oxide is 4:1.

[0032] The non-stick layer adopts a hard ceramic non-stick layer. The non-stick layer of this embodiment is specifically: 22% tetraethoxysilane, 16% nano silica sol, 8% silane coupling agent, 2% nano alumina sol, 1.5% nano zirconium oxide, 0.5% acetic acid, 0.5% silicon carbide whisker, 0.5% graphene, 3% copper chrome black, and 46% deionized water.

[0033] The functional coating is formed by a method comprising the following steps:

[0034] S1. Pre-treatment: The inner tank workpiece is subjected to wire drawing to form a wire drawing surface, and then formed by stamping, welding / riveting, ultrasonic cleaning, degreasing and degreasing;

[0035] S2. Thermal spraying to form a spray layer: plasma spraying spray layer composite powder, flame velocity 800m / s, particle velocity 600m / s, forming a spray layer, the thickness is 35μm, the surface roughness Ra is 0.35μm;

[0036] S3. Post-processing: polish with 40-80 mesh sandpaper, clean, and dry at 80℃;

[0037] S4. Spraying to form a non-stick layer: Electrostatic spraying of ceramic coating, 90℃ / 10min surface drying, 250℃ / 20min curing, thickness of 35μm, completed.

[0038] Example 2

[0039] The present embodiment provides a functional coating for the inner pot of a steam-bake combination machine, comprising a sprayed layer formed on the surface of a substrate by a spraying process and a non-stick layer formed on the surface of the sprayed layer, the substrate adopts a 304 stainless steel substrate, the sprayed layer is composed of a composite material of chromium oxide and aluminum oxide, and the mass ratio of chromium oxide to aluminum oxide is 8:1.

[0040] The non-stick layer adopts a hard ceramic non-stick layer. The non-stick layer of this embodiment is specifically: 22% tetraethoxysilane, 18% nano silica sol, 6% silane coupling agent, 3% nano alumina sol, 1.5% nano zirconium oxide, 0.5% acetic acid, 1% silicon carbide whisker, 0.6% graphene, 3% cobalt blue, and 44.4% deionized water.

[0041] The functional coating is formed by a method comprising the following steps:

[0042] S1. Pre-treatment: The inner tank workpiece is subjected to wire drawing to form a wire drawing surface, and then formed by stamping welding / riveting, ultrasonic cleaning, degreasing and degreasing;

[0043] S2. Thermal spraying to form a spray layer: plasma spraying spray layer composite powder, flame velocity 600m / s, particle velocity 650m / s, forming a spray layer, the thickness is 50μm, the surface roughness Ra is 0.5μm;

[0044] S3. Post-processing: polish with 40-80 mesh sandpaper, clean, and dry at 80℃;

[0045] S4. Spraying to form a non-stick layer: Electrostatic spraying of ceramic coating, 85℃ / 20min surface drying, 250℃ / 20min curing, thickness of 35μm, completed.

[0046] Example 3

[0047] The present embodiment provides a functional coating for the inner pot of a steam-bake combination machine, comprising a sprayed layer formed on the surface of a substrate by a spraying process and a non-stick layer formed on the surface of the sprayed layer, wherein the substrate is a 304 stainless steel substrate, the sprayed layer is a composite material of chromium oxide and aluminum oxide, and the mass ratio of chromium oxide to aluminum oxide is 8:3.

[0048] The non-stick layer adopts a hard ceramic non-stick layer. The non-stick layer of this embodiment is specifically: 20% tetraethoxysilane, 18% nano silica sol, 6% silane coupling agent, 2% nano alumina sol, 2% nano zirconium oxide, 0.5% acetic acid, 0.5% silicon carbide whisker, 0.6% graphene, 3% copper chrome black, and 47.4% deionized water.

[0049] The functional coating is formed by a method comprising the following steps:

[0050] S1. Pre-treatment: The inner tank workpiece is subjected to wire drawing to form a wire drawing surface, and then formed by stamping welding / riveting, ultrasonic cleaning, degreasing and degreasing;

[0051] S2. Thermal spraying to form a spray layer: plasma spraying spray layer composite powder, flame velocity 800m / s, particle velocity 650m / s, forming a spray layer, the thickness is 55μm, the surface roughness Ra is 0.35μm;

[0052] S3. Post-processing: polish with 40-80 mesh sandpaper, clean, and dry at 80℃;

[0053] S4. Spraying to form a non-stick layer: Electrostatic spraying of ceramic coating, 100℃ / 15min surface drying, 250℃ / 20min curing, thickness of 40μm, completed.

[0054] Example 4

[0055] The present embodiment provides a functional coating for the inner pot of a steam-bake combination machine, comprising a sprayed layer formed on the surface of a substrate by a spraying process and a non-stick layer formed on the surface of the sprayed layer, wherein the substrate is a 304 stainless steel substrate, the sprayed layer is a composite material of chromium oxide and aluminum oxide, and the mass ratio of chromium oxide to aluminum oxide is 8:3.

[0056] The non-stick layer adopts a hard ceramic non-stick layer. The non-stick layer of this embodiment is specifically: 35% tetraethoxysilane, 10% nano silica sol, 5% silane coupling agent, 5% nano alumina sol, 5% nano zirconium oxide, 3% acetic acid, 3% silicon carbide whiskers, 1% graphene, 5% high temperature pigment, and 28% deionized water.

[0057] The functional coating is formed by a method comprising the following steps:

[0058] S1. Pre-treatment: The inner tank workpiece is subjected to wire drawing to form a wire drawing surface, and then formed by stamping welding / riveting, ultrasonic cleaning, degreasing and degreasing;

[0059] S2. Thermal spraying to form a spray layer: plasma spraying spray layer composite powder, flame velocity 800m / s, particle velocity 650m / s, forming a spray layer, the thickness is 55μm, the surface roughness Ra is 0.35μm;

[0060] S3. Post-processing: polish with 40-80 mesh sandpaper, clean, and dry at 80℃;

[0061] S4. Spraying to form a non-stick layer: Electrostatic spraying of ceramic coating, 100℃ / 15min surface drying, 250℃ / 20min curing, thickness of 40μm, completed.

[0062] Comparative Example 1

[0063] The difference from Example 1 is that the spraying layer uses chromium oxide as the spraying material.

[0064] Comparative Example 2

[0065] The difference from Example 1 is that the spraying layer uses a chromium oxide-iron oxide (8:2) composite as the spraying material.

[0066] Comparative Example 3

[0067] The difference from Example 1 is that the spraying layer uses a chromium oxide-aluminum oxide composite as the spraying material, and the mass ratio of the two is 1:1.

[0068] Comparative Example 4

[0069] The difference from Example 1 is that the spraying layer uses a chromium oxide-aluminum oxide composite as the spraying material, and the mass ratio of the two is 2:1.

[0070] Comparative Example 5

[0071] This comparative example provides a functional coating for the inner pot of a steam-bake combination machine, comprising a sand layer formed on the surface of a substrate by sandblasting and a non-stick layer formed on the surface of the sand layer, wherein the substrate is a 304 stainless steel substrate. The surface of the substrate is sandblasted with 30# white corundum sharp-angle sand, so that the inner surface roughness of the pot blank reaches Ra2.5μm.

[0072] The non-stick layer adopts a hard ceramic non-stick layer. The non-stick layer of this embodiment is specifically: 22% tetraethoxysilane, 16% nano silica sol, 8% silane coupling agent, 2% nano alumina sol, 1.5% nano zirconium oxide, 0.5% acetic acid, 0.5% silicon carbide whisker, 0.5% graphene, 3% copper chrome black, and 46% deionized water.

[0073] The difference from Example 1 is that the sand layer replaces the sprayed layer.

[0074] Relevant performance tests were conducted on the steam-bake combination machine inner pot provided in each embodiment and comparative example, including deformation degree test and wear resistance test. The test methods and test results are as follows.

[0075] Detection method:

[0076] Deformation degree detection: Place a ruler on the plane to be measured, and use a plug gauge to measure the maximum gap between the ruler and the workpiece plane.

[0077] Wear resistance test: Use 3M7447C industrial sand-containing scouring pad, dip it in water and rub it with a pressure of 10N. Replace the scouring pad with a new one every 500 rubs until the metal substrate is exposed.

[0078] The test results are shown in Table 1.

[0079] Table 1. Test results of relevant performance of the inner liner corresponding to each embodiment and comparative example

[0080]

[0081]

[0082] From the results shown in Table 1, it can be seen that Examples 1-4 adopt the technical solution of the present invention, and the flatness and wear resistance of the corresponding inner liner are relatively excellent, indicating that the solution of the present invention can not only maintain the inner liner from deformation, but also ensure the wear resistance of the inner liner. Compared with Example 1, Comparative Examples 1-4 have different spraying materials, and the wear resistance is greatly reduced. Comparative Example 5 does not use spraying to form a spraying layer, but uses the sandblasting method in the prior art, and its inner liner is deformed and the wear resistance is also reduced.

Claims

1. A functional coating for the inner pot of a steam-bake combination machine, characterized in that: The invention comprises a spraying layer formed on the surface of a substrate by a spraying process and a non-stick layer formed on the surface of the spraying layer, wherein the spraying layer is composed of a chromium oxide-aluminum oxide composite material.

2. The functional coating for the inner pot of a steam-bake combination machine according to claim 1, characterized in that: The composite mass ratio of chromium oxide to aluminum oxide is 8:1-3.

3. The functional coating for the inner pot of a steam-bake combination machine according to claim 1, characterized in that: The composite mass ratio of chromium oxide to aluminum oxide is 4:

1.

4. The functional coating for the inner pot of a steam-bake combination machine according to claim 1, 2 or 3, characterized in that: The thickness of the sprayed layer is 30 μm to 100 μm.

5. The functional coating for the inner pot of a steam-bake combination machine according to claim 1, 2 or 3, characterized in that: The roughness Ra of the sprayed layer is 0.5 μm to 5 μm.

6. The functional coating for the inner pot of a steam-bake combination machine according to claim 1, characterized in that: A wire drawing surface is formed on the surface of the substrate, and the spraying layer is formed on the wire drawing surface.

7. The functional coating for the inner pot of a steam-bake combination machine according to claim 5, characterized in that: The drawing depth of the drawing surface is 30 μm to 100 μm.

8. The functional coating for the inner pot of a steam-bake combination machine according to claim 1, characterized in that: The substrate is 304 stainless steel.

9. The method for forming a functional coating for an inner pot of a steam-bake combination machine according to any one of claims 1 to 8, characterized in that: The steps include: S1. Pre-treatment: degreasing and degreasing the inner tank workpiece; S2. Spraying: Plasma spraying spraying material to form a spraying layer, the flame velocity is 200-1200m / s, and the particle velocity is 30-800m / s; S3. Post-processing: sandpaper polishing, cleaning, drying; S4. Spraying: Electrostatically spray the non-stick coating to form a non-stick coating.

10. A steam-bake combination machine inner pot, characterized in that: The invention comprises a functional coating for the inner pot of a steam-bake combination machine as described in any one of claims 1 to 8.

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