Surface cover and stove

Abstract

The invention provides a surface cover and a stove. The surface cover comprises a base body and a covering layer; the base body is provided with a first face and a second face, the first face is located on the first side of the base body in the thickness direction, and the second face is arranged around the first face. The covering layer comprises a first covering part and a second covering part, the first covering part is arranged on the first face, and the second covering part is arranged on the second face. The covering layer can integrally cover the exposed surface of the base body, so that water resistance of the base body is realized through the covering layer, the probability that water vapor or splashed liquid enters the stove during cooking is reduced, and the stability of the stove during working is improved. And moreover, the covering layer is arranged on the base body, so that erosion of water vapor or splashed liquid to the base body during cooking can be reduced, and the service life of the surface cover is further prolonged. And the covering layer covers the base body, so that the probability that the base body is eroded by water vapor or splashed liquid during cooking can be reduced, and the cracking probability of the surface cover is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cookers, and more particularly, to a cooker top cover and a cooker. Background Art

[0002] Currently, the cooker top cover of a cooker is a glass-ceramic top cover. However, since the raw materials used to manufacture the glass-ceramic top cover include spodumene ore, and the proportion of spodumene ore in the raw materials of the glass-ceramic top cover is 40% to 70%, the cost of the glass-ceramic top cover is relatively high.

[0003] In the related art, to reduce the cost of the top cover, a ceramic top cover can be used instead of the glass-ceramic top cover. However, the waterproof effect of the ceramic top cover is poor, which affects the stability of the cooker during operation. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present invention provides a cooker top cover.

[0006] A second aspect of the present invention provides a cooker.

[0007] In view of this, a first aspect of the present invention provides a cooker top cover, including a base body and a covering layer; the base body is provided with a first surface and a second surface, the first surface is located on a first side of the base body in the thickness direction, and the second surface surrounds the first surface; the covering layer includes a first covering portion and a second covering portion, the first covering portion is arranged on the first surface, and the second covering portion is arranged on the second surface.

[0008] The cooker top cover provided by the present application includes a base body and a covering layer. The base body can provide a certain strength for the cooker top cover, so that the cooker top cover can support the cookware placed on the cooker. The base body includes a first surface and a second surface. The first surface is located on a first side of the base body in the thickness direction, and the second surface surrounds the first surface, that is, the first surface is the upper surface of the base body, and the second surface is the side surface of the base body. The covering layer includes a first covering portion and a second covering portion. The first covering portion is arranged on the first surface, and the second covering portion is arranged on the second surface, so that the covering layer can integrally cover the exposed surface of the base body, thereby realizing the waterproofing of the base body through the covering layer, reducing the probability that water vapor or splashed liquid enters the interior of the cooker during cooking, and improving the stability of the cooker during operation. And by providing a covering layer on the base body, the erosion of the base body caused by water vapor or splashed liquid during cooking can also be reduced, thereby prolonging the service life of the cooker top cover. And the covering layer covers the base body, which can also reduce the probability of the base body being eroded by water vapor or splashed liquid during cooking, thereby reducing the probability of the cooker top cover cracking.

[0009] Specifically, the first surface is the upper surface of the substrate, and the second surface is the side surface of the substrate. When the first surface is rectangular, the second surface is the four side surfaces of the substrate. When the first surface is circular, the second surface is the annular side surface of the substrate.

[0010] Optionally, the thickness of the coating layer is greater than or equal to 50 μm, which improves the strength of the coating layer and reduces the probability of the coating layer cracking when subjected to mechanical impact. The thickness of the coating layer is less than or equal to 500 μm, which reduces the cost of the coating layer and can reduce the stress of the coating layer itself, reducing the probability of the coating layer cracking.

[0011] The water absorption rate of the coating layer is less than or equal to 1%, which can prevent liquid from entering the substrate through the coating layer and then entering the internal components through the substrate, causing leakage.

[0012] When the preset temperature range where the coating layer is located is from room temperature to 1000 °C, the coefficient of thermal expansion of the coating layer is greater than or equal to 0×10 -6 / K and less than or equal to 1.5×10 -6 / K, so that the coating layer has a low coefficient of thermal expansion. In this way, when the face cover is heated at a high temperature, the coating layer can be prevented from cracking. K is the temperature unit Kelvin.

[0013] The thickness of the coating layer is any value among 320 μm, 350 μm, 380 μm, 400 μm, 420 μm, 450 μm, and 480 μm.

[0014] The water absorption rate of the coating layer is any value among 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, and 0.9%.

[0015] It should be noted here that the room temperature referred to in this application is greater than or equal to 10 °C and less than or equal to 30 °C.

[0016] In addition, the face cover in the above technical solution provided by the present invention may further have the following additional technical features:

[0017] In a technical solution of the present invention, optionally, the materials of the substrate and the coating layer are different; and / or the densities of the substrate and the coating layer are different; and / or the coefficients of thermal expansion of the substrate and the coating layer are different.

[0018] In this technical solution, the different materials of the substrate and the coating layer, and / or the different densities of the substrate and the coating layer, and / or the different coefficients of thermal expansion of the substrate and the coating layer can all enable the substrate and the coating layer to have different performance parameters, so that the face cover can be applicable to more application scenarios and improve the applicable range of the face cover.

[0019] Furthermore, the coefficient of thermal expansion of the coating layer is 0.2×10 -6 / K, 0.5×10-6 / K, 0.8×10 -6 / K, 1×10 -6 / K, 1.2×10 -6 / K, 1.5×10 -6 Any value in / K. In a technical solution of the present invention, optionally, the temperature that the substrate and the covering layer can withstand is greater than or equal to the first temperature.

[0020] In this technical solution, the temperature that the substrate and the covering layer can withstand is greater than or equal to the first temperature, thereby improving the stability of the substrate and the covering layer in the working chamber.

[0021] Furthermore, the first temperature can be 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, 900 °C or 1000 °C.

[0022] In a technical solution of the present invention, optionally, the substrate is a ceramic substrate and the covering layer is a glaze layer.

[0023] In this technical solution, the substrate is a ceramic substrate, and the ceramic substrate can reduce the cost of the face cover. The covering layer is a glaze layer, and the glaze layer can prevent the liquid on the surface of the face cover from entering the interior of the stove through the face cover, further improving the stability of the stove during operation. And the glaze layer can be manufactured simultaneously with the ceramic substrate, thereby reducing the manufacturing difficulty of the face cover, simplifying the manufacturing process of the face cover, and further reducing the cost of the face cover.

[0024] In a technical solution of the present invention, the sum of the thickness of the substrate and the thickness of the covering layer is greater than or equal to 3 mm and less than or equal to 8 mm.

[0025] In this technical solution, the sum of the thickness of the substrate and the thickness of the covering layer is the thickness of the face cover. By adjusting the thickness of the face cover, the disk spacing of the stove can be adjusted, and then by adjusting the disk spacing, the working efficiency of the stove can be adjusted. The sum of the thickness of the substrate and the thickness of the covering layer is greater than or equal to 3 mm and less than or equal to 8 mm, that is, the thickness of the face cover is 3 mm to 8 mm, which can ensure that the face cover has a certain strength, reduce the probability of cracking of the face cover due to impact, and also make the disk spacing of the stove in a more reasonable range, thereby improving the energy efficiency of the stove.

[0026] Optionally, the sum of the thickness of the substrate and the thickness of the covering layer is greater than or equal to 4 mm and less than or equal to 6 mm.

[0027] Specifically, the disk spacing is the distance between the upper surface of the face cover and the upper surface of the coil disk.

[0028] Specifically, the sum of the thickness of the substrate and the thickness of the covering layer can be 3 mm.

[0029] The sum of the thickness of the substrate and the thickness of the covering layer may also be 4 mm, 5 mm, 6 mm or 7 mm.

[0030] The sum of the thickness of the substrate and the thickness of the covering layer may also be 8 mm.

[0031] Optionally, the ratio of the thickness of the substrate to the thickness of the covering layer is between 10 and 200, which can ensure the strength of the face cover and meet the mechanical shock requirements.

[0032] In a technical solution of the present invention, optionally, the crystal phase of the substrate includes a magnesium-aluminum-silicon-oxygen crystal phase; and / or the crystal phase of the covering layer includes a lithium-aluminum-silicon-oxygen crystal phase.

[0033] In this technical solution, the crystal phase of the substrate includes a magnesium-aluminum-silicon-oxygen crystal phase, so that the substrate has a low coefficient of thermal expansion. Furthermore, when the face cover is subjected to a thermal shock, the heat resistance of the face cover can be improved, and the face cover can be prevented from cracking due to excessive expansion.

[0034] The crystal phase in the covering layer includes a lithium-aluminum-silicon-oxygen negative expansion crystal phase. On the one hand, lithium forms Li 2 O (lithium oxide) during sintering. Lithium oxide belongs to an alkali metal oxide flux, and a liquid glass phase will be formed during high-temperature sintering, which will then fill the gaps between the particles, promote the densification sintering of the covering layer, make the covering layer have a high density after sintering, and at the same time make the covering layer form a large volume shrinkage. Since the shrinkage rate of the substrate during sintering is low, a surface compressive stress is formed when the covering layer shrinks. Thermal shock is mainly tensile stress, so cracking caused by thermal stress can be further slowed down during the thermal shock process. In addition, lithium forms a lithium-aluminum-silicon-oxygen negative expansion crystal phase with negative expansion coefficient with other elements in the covering layer, which can greatly reduce the overall coefficient of thermal expansion of the covering layer.

[0035] Optionally, the expansion coefficient of the covering layer is lower than that of the substrate.

[0036] In a technical solution of the present invention, optionally, the material of the substrate includes magnesium, aluminum, silicon and oxygen elements; the mass percentage of magnesium element is greater than or equal to 2% and less than or equal to 10%; the mass percentage of aluminum element is greater than or equal to 10% and less than or equal to 20%; the mass percentage of silicon element is greater than or equal to 15% and less than or equal to 30%; the mass percentage of oxygen element is greater than or equal to 40% and less than or equal to 60%.

[0037] In this technical solution, the mass percentage of magnesium element is greater than or equal to 2% and less than or equal to 10%; the mass percentage of aluminum element is greater than or equal to 10% and less than or equal to 20%; the mass percentage of silicon element is greater than or equal to 15% and less than or equal to 30%; the mass percentage of oxygen element is greater than or equal to 40% and less than or equal to 60%, so that the matrix can synthesize a crystal phase with a low expansion coefficient, and at the same time, aluminum oxide can be formed by aluminum element and oxygen element to enhance the bonding force between the coating and the matrix.

[0038] Specifically, the mass percentage of magnesium element is any value among 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%.

[0039] The mass percentage of aluminum element is any value among 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%.

[0040] The mass percentage of silicon element is any value among 15%, 17%, 18%, 19%, 20%, 22%, 24%, 26%, 28%, 30%.

[0041] The mass percentage of oxygen element is any value among 40%, 42%, 44%, 46%, 48%, 50%, 52%, 55%, 57%, 59%, 60%.

[0042] Specifically, the material of the matrix includes magnesium element, aluminum element, silicon element and oxygen element. The mass percentage of magnesium element is 5%, the mass percentage of aluminum element is 15%, the mass percentage of silicon element is 25%, and the mass percentage of oxygen element is 55%.

[0043] Specifically, the material of the matrix includes magnesium element, aluminum element, silicon element and oxygen element. The mass percentage of magnesium element is 8%, the mass percentage of aluminum element is 17%, the mass percentage of silicon element is 30%, and the mass percentage of oxygen element is 45%.

[0044] Specifically, the material of the matrix includes magnesium element, aluminum element, silicon element and oxygen element. The mass percentage of magnesium element is 2%, the mass percentage of aluminum element is 20%, the mass percentage of silicon element is 28%, and the mass percentage of oxygen element is 50%.

[0045] In one technical solution of the present invention, optionally, the material of the coating layer includes lithium element, magnesium element, aluminum element, silicon element and oxygen element; the mass percentage of the lithium element is greater than or equal to 0.1% and less than or equal to 5%; the mass percentage of the magnesium element is greater than or equal to 0 and less than or equal to 8%; the mass percentage of the aluminum element is greater than or equal to 5% and less than or equal to 15%; the mass percentage of the silicon element is greater than or equal to 20% and less than or equal to 40%; the mass percentage of the oxygen element is greater than or equal to 50% and less than or equal to 70%.

[0046] In this technical solution, the material of the coating layer includes lithium element, magnesium element, aluminum element, silicon element and oxygen element. The mass percentage of the lithium element is greater than or equal to 0.1% and less than or equal to 5%, the mass percentage of the magnesium element is greater than or equal to 0 and less than or equal to 8%, the mass percentage of the aluminum element is greater than or equal to 5% and less than or equal to 15%, the mass percentage of the silicon element is greater than or equal to 20% and less than or equal to 40%, and the mass percentage of the oxygen element is greater than or equal to 50% and less than or equal to 70%. This can not only ensure the bonding force between the coating layer and the substrate, but also enable the coating layer to form a negative thermal expansion coefficient crystal phase.

[0047] Specifically, the mass percentage of the lithium element is any value among 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%.

[0048] The mass percentage of the magnesium element is any value among 0, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%.

[0049] The mass percentage of the aluminum element is any value among 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%.

[0050] The mass percentage of the silicon element is any value among 20%, 22%, 24%, 25%, 27%, 29%, 30%, 32%, 35%, 37%, 40%.

[0051] The mass percentage of the oxygen element is any value among 50%, 52%, 55%, 57%, 59%, 60%, 62%, 64%, 65%, 70%.

[0052] Specifically, the material of the coating layer includes lithium element, magnesium element, aluminum element, silicon element and oxygen element. The mass percentage of the lithium element is 2%, the mass percentage of the magnesium element is 5%, the mass percentage of the aluminum element is 10%, the mass percentage of the silicon element is 30%, and the mass percentage of the oxygen element is 53%.

[0053] Specifically, the material of the covering layer includes lithium, aluminum, silicon, and oxygen elements. The mass percentage of lithium element is 5%, the mass percentage of aluminum element is 15%, the mass percentage of silicon element is 25%, and the mass percentage of oxygen element is 55%.

[0054] Specifically, the material of the covering layer includes lithium, magnesium, aluminum, silicon, and oxygen elements. The mass percentage of lithium element is 0.5%, the mass percentage of magnesium element is 7.5%, the mass percentage of aluminum element is 12%, the mass percentage of silicon element is 20%, and the mass percentage of oxygen element is 60%.

[0055] The particulate matter of the matrix structure has been solid-state sintered so that atomic diffusion occurs between the particles to form a sintering neck, ensuring the impact strength of the ceramic plate. At the same time, the matrix structure is relatively loose compared to the covering layer, and there is a Mg-Al-Si-O phase with a low coefficient of thermal expansion, taking into account the thermal shock resistance of the ceramic panel. The covering layer is denser than the matrix structure, and there should be no cracks on the surface of the covering layer that penetrate into the matrix structure, and it needs to be tightly combined with the matrix structure.

[0056] In a technical solution of the present invention, optionally, the density of the covering layer is greater than the density of the matrix.

[0057] In this technical solution, the density of the covering layer is greater than the density of the matrix. Therefore, the density of the matrix is lower than that of the covering layer. Compared with the covering layer, due to the lower density of the matrix, the gaps between the grains inside it are larger. In this way, when the face cover is heated, these gaps can offset the volume expansion caused by the thermal expansion of the particles, and macroscopically avoid cracking of the ceramic plate during high-temperature heating. Correspondingly, the relatively high density of the covering layer results in a lower water absorption rate, so it has better waterproof performance.

[0058] Optionally, the material components of the covering layer are more easily densified and sintered, and there are gaps between the grains of the matrix.

[0059] In a technical solution of the present invention, optionally, the second covering part is connected to the first covering part, and a first chamfering part is provided between the first covering part and the second covering part. The first angle between the surface of the first chamfering part and the second covering part is greater than or equal to 0.1 degree and less than 180 degrees.

[0060] In this technical solution, a first chamfering part is provided between the first covering part and the second covering part. The first angle between the surface of the first chamfering part and the second surface is from 0.1 degree to 180 degrees. The first chamfering part can reduce the probability of glaze layer cracking caused by glaze accumulation during the glazing process. And a first chamfering part is provided between the first covering part and the second covering part, which can also reduce the sharpness of the edges and corners of the face cover, thereby reducing the probability of the face cover scratching the stove operator and improving the safety of the stove during use.

[0061] In one technical solution of the present invention, optionally, there is a second chamfering portion between the first surface and the second surface, and the second included angle between the second chamfering portion and the second surface is greater than or equal to 0.1 degree and less than 180 degrees.

[0062] In this technical solution, there is a second chamfering portion between the first surface and the second surface, and the second included angle between the second chamfering portion and the second surface is greater than or equal to 0.1 degree and less than 180 degrees. The second chamfering portion can reduce the probability of glaze layer cracking caused by glaze accumulation during the glazing process.

[0063] Furthermore, the first chamfering portion and the second chamfering portion are arranged oppositely.

[0064] In one technical solution of the present invention, optionally, the face cover includes a support member and a control member; the support member is arranged on the second side of the base body in the thickness direction, and the second side is opposite to the first side; the control member is connected to the support member.

[0065] In this technical solution, the face cover includes a support member. The support member is arranged on the second side of the base body in the thickness direction, and thus the base body can be supported by the support member. The face cover further includes a control member, and the control member is arranged side by side with the base body, thereby facilitating the operator of the stove to control the stove through the control member.

[0066] Optionally, the support member is a plastic part.

[0067] The bottom surface of the base body and the support member are bonded with a waterproof glue such as silicone glue.

[0068] The control member is arranged side by side with the base body.

[0069] In one technical solution of the present invention, optionally, the base body is provided with a first hole; the covering layer further includes a third covering portion, and the third covering portion is arranged on the inner wall of the first hole.

[0070] In this technical solution, the inner wall of the first hole on the base is also covered with the third covering portion, so that the covering layer covers a larger area of the base body, further improving the waterproof performance of the face cover.

[0071] In one technical solution of the present invention, optionally, the covering layer is attached to the base body.

[0072] In this technical solution, the covering layer is attached to the base body, making the contact between the covering layer and the base body closer, and further improving the waterproof performance of the face cover.

[0073] In one technical solution of the present invention, optionally, the covering layer and the base body are of an integrally sintered and formed structure.

[0074] In this technical solution, the cover layer and the substrate are integrally sintered and formed, enabling atomic diffusion between particles to form sintering necks, thereby enhancing the mechanical strength of the face cover. At the same time, it can also cause the cover layer to form a structure with a relatively low density through sintering.

[0075] It can be understood that the face cover is a ceramic face cover.

[0076] The second aspect of the present invention provides a stove, including the face cover of any of the above technical solutions. Therefore, the stove has all the beneficial effects of the face cover of any of the above technical solutions.

[0077] Specifically, the stove includes an induction cooker, a multi-head stove, etc.

[0078] Optionally, the stove further includes a housing and a coil disk. The housing is provided with an installation cavity with an opening at the top. The coil disk is disposed in the installation cavity, and the face cover is covered on the opening of the housing and located above the coil disk. Specifically, the second surface of the face cover is disposed opposite to the coil disk.

[0079] The coil disk can be an electromagnetic coil disk. A cooking pot is placed on the face cover, and the coil disk can heat the food ingredients in the cooking pot.

[0080] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0082] Figure 1 is one of the schematic structural diagrams of the face cover according to an embodiment of the present invention;

[0083] Figure 2 is the schematic structural diagram of the substrate according to an embodiment of the present invention;

[0084] Figure 3 is the schematic structural diagram of the panel according to an embodiment of the present invention;

[0085] Figure 4 is the schematic microstructural diagram of the panel according to an embodiment of the present invention;

[0086] Figure 5 is one of the schematic partial structural diagrams of the panel according to an embodiment of the present invention;

[0087] Figure 6 is the second schematic structural diagram of the face cover according to an embodiment of the present invention;

[0088] Figure 7The third schematic structural view of the face cover according to an embodiment of the present invention;

[0089] Figure 8 The second partial structural view of the panel according to an embodiment of the present invention.

[0090] Wherein, Figures 1 to 8 The corresponding relationship between the reference numerals and the component names in

[0091] 10 face cover, 100 panel, 110 substrate, 112 first surface, 114 second surface, 116 first hole, 118 second chamfered portion, 120 covering layer, 122 first covering portion, 124 second covering portion, 126 third covering portion, 130 first chamfered portion, 200 support member, 300 control member. Detailed implementation manners

[0092] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0093] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0094] Next, refer to Figures 1 to 8 Describe the face cover 10 and the stove according to some embodiments of the present invention.

[0095] In an embodiment of the present invention, as Figure 1 shown, a face cover 10 is provided, including a substrate 110 and a covering layer 120; as Figure 2 shown, the substrate 110 is provided with a first surface 112 and a second surface 114, the first surface 112 is located on the first side of the substrate 110 in the thickness direction, and the second surface 114 is arranged around the first surface 112; as Figure 3 shown, the covering layer 120 includes a first covering portion 122 and a second covering portion 124, the first covering portion 122 is arranged on the first surface 112, and the second covering portion 124 is arranged on the second surface 114.

[0096] In this embodiment, the face cover 10 includes a base body 110 and a covering layer 120. The base body 110 can provide a certain strength for the face cover 10, so that the face cover 10 can support the cookware placed on the stove. The base body 110 includes a first face 112 and a second face 114. The first face 112 is located on the first side of the base body 110 in the thickness direction, and the second face 114 is arranged around the first face 112. That is, the first face 112 is the upper surface of the base body 110, and the second face 114 is the side surface of the base body 110. The covering layer 120 includes a first covering portion 122 and a second covering portion 124. The first covering portion 122 is arranged on the first face 112, and the second covering portion 124 is arranged on the second face 114, so that the covering layer 120 can integrally cover the exposed surface of the base body 110. Thus, the waterproofing of the base body 110 is realized through the covering layer 120, and the probability that water vapor or splashed liquid enters the interior of the stove during cooking is reduced, thereby improving the stability of the stove during operation. And by providing the covering layer 120 on the base body 110, the erosion of the base body 110 caused by water vapor or splashed liquid during cooking can also be reduced, thereby prolonging the service life of the face cover 10. And since the covering layer 120 covers the base body 110, the probability that water vapor or splashed liquid erodes the base body 110 can also be reduced, thereby reducing the probability of cracking of the face cover 10.

[0097] Specifically, the first face 112 is the upper surface of the base body 110, and the second face 114 is the side surface of the base body 110. When the first face 112 is rectangular, the second face 114 is the four side surfaces of the base body 110. When the first face 112 is circular, the second face 114 is the annular side surface of the base body 110.

[0098] Optionally, the thickness of the covering layer 120 is greater than or equal to 50 μm, which improves the strength of the covering layer 120 and reduces the probability of cracking of the covering layer 120 when subjected to mechanical impact. The thickness of the covering layer 120 is less than or equal to 500 μm, which reduces the cost of the covering layer 120 and can also reduce the stress of the covering layer 120 itself, reducing the probability of cracking of the covering layer.

[0099] The water absorption rate of the covering layer 120 is less than or equal to 1%, which can prevent liquid from entering the base body 110 through the covering layer 120 and then causing electric leakage on the internal components through the base body 110.

[0100] When the preset temperature range where the covering layer 120 is located is from room temperature to 1000 °C, the expansion coefficient of the covering layer 120 is greater than or equal to 0×10 -6 / K and less than or equal to 1.5×10 -6 / K, so that the covering layer 120 has a low expansion coefficient. In this way, when the face cover 10 is heated at a high temperature, the covering layer 120 can be prevented from cracking.

[0101] The thickness of the covering layer 120 is any value among 320μm, 350μm, 380μm, 400μm, 420μm, 450μm, and 480μm.

[0102] The water absorption rate of the covering layer 120 is any value among 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, and 0.9%.

[0103] It should be noted here that the room temperature referred to in this application is greater than or equal to 10°C and less than or equal to 30°C.

[0104] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0105] The material of the substrate 110 is different from that of the covering layer 120; and / or the density of the substrate 110 is different from that of the covering layer 120; and / or the coefficient of thermal expansion of the substrate 110 is different from that of the covering layer 120.

[0106] In this technical solution, the difference in the material of the substrate 110 and the covering layer 120, and / or the difference in the density of the substrate 110 and the covering layer 120, and / or the difference in the coefficient of thermal expansion of the substrate 110 and the covering layer 120 can all enable the substrate 110 and the covering layer 120 to have different performance parameters, thereby enabling the face cover to be applicable to more application scenarios and expanding the applicable range of the face cover.

[0107] Further, the coefficient of thermal expansion of the covering layer is 0.2×10 -6 / K, 0.5×10 -6 / K, 0.8×10 -6 / K, 1×10 -6 / K, 1.2×10 -6 / K, 1.5×10 -6 / K, any value among them.

[0108] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0109] The substrate 110 and the covering layer 120 can withstand a temperature greater than or equal to the first temperature and can withstand the high temperature of the heating component of the stove.

[0110] Further, the base body 110 and the covering layer 120 can be light-impermeable members, so that the base body 110 and the covering layer 120 can block the components inside the stove, thereby making the appearance of the stove cleaner; or, the base body 110 and the covering layer 120 can both be light-transmissive members, so that when the heating coil plate inside the stove works, the heat generated is visible as red light, to warn the user that the stove panel is too hot to touch, and improve the safety of using the appliance. The base body 110 and the covering layer 120 can withstand a temperature greater than or equal to the first temperature, thereby improving the stability of the base body 110 and the covering layer 120 in the working chamber.

[0111] Further, the first temperature can be 400 degrees Celsius, 500 degrees Celsius, 600 degrees Celsius, 700 degrees Celsius, 800 degrees Celsius, 900 degrees Celsius or 1000 degrees Celsius.

[0112] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0113] As Figure 4 shown, the base body 110 is a ceramic base body, and the covering layer 120 is a glaze layer.

[0114] In this embodiment, the base body 110 is a ceramic base body, and the ceramic base body can reduce the cost of the face cover 10. The covering layer 120 is a glaze layer, and the glaze layer can prevent the liquid on the surface of the face cover 10 from entering the stove interior through the face cover 10, further improving the stability of the stove during operation. And the glaze layer can be manufactured simultaneously with the ceramic base body, thereby reducing the manufacturing difficulty of the face cover 10, simplifying the manufacturing process of the face cover 10, and further reducing the cost of the face cover 10.

[0115] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0116] The sum of the thickness of the base body 110 and the thickness of the covering layer 120 is greater than or equal to 3 mm and less than or equal to 8 mm.

[0117] In this embodiment, the sum of the thickness of the base body 110 and the thickness of the covering layer 120 is the thickness of the face cover 10. By adjusting the thickness of the face cover 10, the disk spacing of the stove can be adjusted, and then the working efficiency of the stove can be adjusted by adjusting the disk spacing. The sum of the thickness of the base body 110 and the thickness of the covering layer 120 is greater than or equal to 3 mm and less than or equal to 8 mm, that is, the thickness of the face cover 10 is 3 mm to 8 mm, which can ensure that the face cover 10 has a certain strength, reduce the probability of cracking of the face cover 10 due to impact, and also make the disk spacing of the stove in a more reasonable range, thereby improving the energy efficiency of the stove.

[0118] Optionally, the sum of the thickness of the substrate 110 and the thickness of the covering layer 120 is greater than or equal to 4 mm and less than or equal to 6 mm.

[0119] Specifically, the disk spacing is the distance between the upper surface of the face cover 10 and the upper surface of the coil disk.

[0120] Specifically, the sum of the thickness of the substrate 110 and the thickness of the covering layer 120 may be 3 mm.

[0121] The sum of the thickness of the substrate 110 and the thickness of the covering layer 120 may also be 4 mm, 5 mm, 6 mm or 7 mm.

[0122] The sum of the thickness of the substrate 110 and the thickness of the covering layer 120 may also be 8 mm.

[0123] Optionally, the ratio of the thickness of the substrate 110 to the thickness of the covering layer 120 is between 10 and 200, which can ensure the strength of the face cover 10 and meet the mechanical shock requirements.

[0124] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0125] The crystal phase of the substrate 110 includes a magnesium-aluminum-silicon-oxygen crystal phase; and / or the crystal phase of the covering layer 120 includes a lithium-aluminum-silicon-oxygen crystal phase.

[0126] In this embodiment, the crystal phase of the substrate 110 includes a magnesium-aluminum-silicon-oxygen crystal phase, so that the substrate 110 has a low coefficient of thermal expansion. Furthermore, when the face cover 10 is subjected to a thermal shock, the heat resistance of the face cover 10 can be improved, and the face cover 10 can be prevented from cracking due to excessive expansion.

[0127] The crystal phase in the covering layer 120 includes a lithium-aluminum-silicon-oxygen negative expansion crystal phase. On the one hand, lithium forms Li 2 O (lithium oxide) during sintering. Lithium oxide belongs to an alkali metal oxide flux, and a liquid glass phase will be formed during high-temperature sintering, which will then fill the gaps between the particles, promoting the densification sintering of the covering layer 120, making the covering layer 120 have a high density after sintering, and at the same time causing a large volume shrinkage of the covering layer 120. Since the shrinkage rate of the substrate 110 during sintering is low, a surface compressive stress is formed when the covering layer 120 shrinks. Thermal shock is mainly tensile stress, so cracking caused by thermal stress can be further reduced during the thermal shock process. In addition, lithium forms a lithium-aluminum-silicon-oxygen negative expansion crystal phase with negative expansion coefficient with other elements in the covering layer 120, which can greatly reduce the overall coefficient of thermal expansion of the covering layer 120.

[0128] Optionally, the expansion coefficient of the covering layer 120 is lower than that of the substrate 110.

[0129] Further, the crystal phase in the covering layer 120 may also include a lithium-magnesium-aluminum-silicon-oxygen crystal phase.

[0130] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0131] The material of the substrate 110 includes magnesium, aluminum, silicon, and oxygen elements; the mass percentage of magnesium element is greater than or equal to 2% and less than or equal to 10%; the mass percentage of aluminum element is greater than or equal to 10% and less than or equal to 20%; the mass percentage of silicon element is greater than or equal to 15% and less than or equal to 30%; the mass percentage of oxygen element is greater than or equal to 40% and less than or equal to 60%.

[0132] In this embodiment, the mass percentage of magnesium element is greater than or equal to 2% and less than or equal to 10%; the mass percentage of aluminum element is greater than or equal to 10% and less than or equal to 20%; the mass percentage of silicon element is greater than or equal to 15% and less than or equal to 30%; the mass percentage of oxygen element is greater than or equal to 40% and less than or equal to 60%, enabling the substrate 110 to synthesize a crystal phase with a low coefficient of thermal expansion. At the same time, aluminum oxide can be formed by aluminum and oxygen elements to enhance the bonding force between the covering layer 120 and the substrate 110.

[0133] Specifically, the mass percentage of magnesium element is any value among 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, and 10%.

[0134] The mass percentage of aluminum element is any value among 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, and 20%.

[0135] The mass percentage of silicon element is any value among 15%, 17%, 18%, 19%, 20%, 22%, 24%, 26%, 28%, and 30%.

[0136] The mass percentage of oxygen element is any value among 40%, 42%, 44%, 46%, 48%, 50%, 52%, 55%, 57%, 59%, and 60%.

[0137] Specifically, the material of the substrate 110 includes magnesium, aluminum, silicon, and oxygen elements, with the mass percentage of magnesium element being 5%, the mass percentage of aluminum element being 15%, the mass percentage of silicon element being 25%, and the mass percentage of oxygen element being 55%.

[0138] Specifically, the material of the substrate 110 includes magnesium element, aluminum element, silicon element and oxygen element. The mass percentage of magnesium element is 8%, the mass percentage of aluminum element is 17%, the mass percentage of silicon element is 30%, and the mass percentage of oxygen element is 45%.

[0139] Specifically, the material of the substrate 110 includes magnesium element, aluminum element, silicon element and oxygen element. The mass percentage of magnesium element is 2%, the mass percentage of aluminum element is 20%, the mass percentage of silicon element is 28%, and the mass percentage of oxygen element is 50%.

[0140] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0141] The material of the coating layer 120 includes lithium element, magnesium element, aluminum element, silicon element and oxygen element; the mass percentage of lithium element is greater than or equal to 0.1% and less than or equal to 5%; the mass percentage of magnesium element is greater than or equal to 0 and less than or equal to 8%; the mass percentage of aluminum element is greater than or equal to 5% and less than or equal to 15%; the mass percentage of silicon element is greater than or equal to 20% and less than or equal to 40%; the mass percentage of oxygen element is greater than or equal to 50% and less than or equal to 70%.

[0142] In this embodiment, the material of the coating layer 120 includes lithium element, magnesium element, aluminum element, silicon element and oxygen element. The mass percentage of lithium element is greater than or equal to 0.1% and less than or equal to 5%, the mass percentage of magnesium element is greater than or equal to 0 and less than or equal to 8%, the mass percentage of aluminum element is greater than or equal to 5% and less than or equal to 15%, the mass percentage of silicon element is greater than or equal to 20% and less than or equal to 40%, and the mass percentage of oxygen element is greater than or equal to 50% and less than or equal to 70%. This can not only ensure the bonding force between the coating layer 120 and the substrate 110, but also enable the coating layer 120 to form a negative thermal expansion coefficient crystal phase.

[0143] Specifically, the mass percentage of lithium element is any value among 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%.

[0144] The mass percentage of magnesium element is any value among 0, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%.

[0145] The mass percentage of aluminum element is any value among 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%.

[0146] The mass percentage of silicon element is any value among 20%, 22%, 24%, 25%, 27%, 29%, 30%, 32%, 35%, 37%, 40%.

[0147] The mass percentage of oxygen element is any value among 50%, 52%, 55%, 57%, 59%, 60%, 62%, 64%, 65%, and 70%.

[0148] Specifically, the material of the covering layer 120 includes lithium element, magnesium element, aluminum element, silicon element, and oxygen element. The mass percentage of lithium element is 2%, the mass percentage of magnesium element is 5%, the mass percentage of aluminum element is 10%, the mass percentage of silicon element is 30%, and the mass percentage of oxygen element is 53%.

[0149] Specifically, the material of the covering layer 120 includes lithium element, aluminum element, silicon element, and oxygen element. The mass percentage of lithium element is 5%, the mass percentage of aluminum element is 15%, the mass percentage of silicon element is 25%, and the mass percentage of oxygen element is 55%.

[0150] Specifically, the material of the covering layer 120 includes lithium element, magnesium element, aluminum element, silicon element, and oxygen element. The mass percentage of lithium element is 0.5%, the mass percentage of magnesium element is 7.5%, the mass percentage of aluminum element is 12%, the mass percentage of silicon element is 20%, and the mass percentage of oxygen element is 60%.

[0151] The particulate matters of the matrix 110 structure are solid-state sintered so that atomic diffusion occurs between the particles to form a sintering neck, ensuring the impact strength of the ceramic plate. At the same time, the structure of the matrix 110 is relatively loose compared to the covering layer 120, and there is a Mg-Al-Si-O phase with a low expansion coefficient, taking into account the thermal shock resistance of the ceramic panel 100. The covering layer 120 is denser than the matrix 110 structure, and there should be no cracks on the surface of the covering layer 120 that penetrate into the matrix 110 structure, and it needs to be tightly combined with the matrix 110 structure.

[0152] This embodiment provides a face cover 10, which further includes the following technical features in addition to the technical features of the above embodiment.

[0153] As Figure 4 shown, the density of the covering layer 120 is greater than that of the matrix 110.

[0154] In this embodiment, the density of the covering layer 120 is greater than that of the matrix 110. Therefore, the density of the matrix 110 is lower than that of the covering layer 120. Compared with the covering layer 120, due to the lower density of the matrix 110, the gaps between the grains inside it are larger. In this way, when the face cover 10 is heated, these gaps can offset the volume expansion caused by the thermal expansion of the particles, and macroscopically prevent the ceramic plate from cracking during high-temperature heating. Correspondingly, the greater density of the covering layer 120 results in a lower water absorption rate, so it has better waterproof performance.

[0155] Optionally, the material composition of the cover layer 120 is more prone to densification sintering, and there are gaps between the grains of the substrate 110.

[0156] This embodiment provides a face cover 10, which further includes the following technical features in addition to the technical features of the above embodiments.

[0157] As Figure 5 shown, the second covering portion 124 is connected to the first covering portion 122, and a first chamfering portion 130 is provided between the first covering portion 122 and the second covering portion 124. The first included angle a between the surface of the first chamfering portion 130 and the second covering portion 124 is greater than or equal to 0.1 degree and less than 180 degrees.

[0158] In this embodiment, a first chamfering portion 130 is provided between the first covering portion 122 and the second covering portion 124. The first included angle a between the surface of the first chamfering portion 130 and the second surface 114 is 0.1 degree to 180 degrees. The first chamfering portion 130 can reduce the probability of glaze layer cracking caused by glaze accumulation during the glazing process. And a first chamfering portion 130 is provided between the first covering portion 122 and the second covering portion 124, which can also reduce the sharpness of the edge position of the face cover 10, thereby reducing the probability of the face cover 10 scratching the stove operator and improving the safety of the stove during use.

[0159] This embodiment provides a face cover 10, which further includes the following technical features in addition to the technical features of the above embodiments.

[0160] As Figure 5 shown, there is a second chamfering portion 118 between the first surface 112 and the second surface 114. The second included angle b between the second chamfering portion 118 and the second surface 114 is greater than or equal to 0.1 degree and less than 180 degrees.

[0161] In this technical solution, there is a second chamfering portion 118 between the first surface 112 and the second surface 114. The second included angle b between the second chamfering portion 118 and the second surface 114 is greater than or equal to 0.1 degree and less than 180 degrees. The second chamfering portion 118 can reduce the probability of glaze layer cracking caused by glaze accumulation during the glazing process.

[0162] Furthermore, the first chamfering portion 130 and the second chamfering portion 118 are arranged opposite to each other.

[0163] This embodiment provides a face cover 10, which further includes the following technical features in addition to the technical features of the above embodiments.

[0164] As Figure 1As shown, the face cover 10 includes a support member 200 and a control member 300; the support member 200 is disposed on the second side of the base body 110 in the thickness direction, and the second side is disposed opposite to the first side; as Figure 6 and Figure 7 shown, the control member 300 is connected to the support member 200.

[0165] In this embodiment, the face cover 10 includes a support member 200, and the support member is disposed on the second side of the base body 110 in the thickness direction, so that the base body 110 can be supported by the support member 200. The face cover 10 further includes a control member 300, and the control member 300 is arranged side by side with the base body 110, so that the operator of the stove can conveniently control the stove through the control member 300.

[0166] Optionally, the support member 200 is a plastic part.

[0167] The bottom surface of the base body 110 and the support member 200 are bonded with a waterproof glue such as silicone glue.

[0168] The control member 300 is arranged side by side with the base body 110.

[0169] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0170] As Figure 8 shown, the base body 110 is provided with a first hole 116; the covering layer 120 further includes a third covering portion 126, and the third covering portion 126 is arranged on the inner wall of the first hole 116.

[0171] In this embodiment, the inner wall of the first hole 116 on the base is also covered with the third covering portion 126, so that the covering layer 120 covers a larger area of the base body 110, further improving the waterproof performance of the face cover 10.

[0172] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0173] As Figure 3 shown, the covering layer 120 is attached to the base body 110.

[0174] In this embodiment, the covering layer 120 is attached to the base body 110, so that the contact between the covering layer 120 and the base body 110 is closer, further improving the waterproof performance of the face cover 10.

[0175] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0176] As Figure 4As shown, the covering layer 120 and the base body 110 are of an integrally sintered and formed structure.

[0177] In this embodiment, the covering layer 120 and the base body 110 are integrally sintered and formed, enabling atomic diffusion between particles to form sintering necks, thereby enhancing the mechanical strength of the face cover 10. At the same time, it can also enable the covering layer 120 to form a structure with a relatively low density through sintering.

[0178] It can be understood that the face cover 10 is a ceramic face cover 10.

[0179] The second aspect of the present invention provides a cooking appliance, including the face cover 10 of any of the above embodiments. Therefore, this cooking appliance has all the beneficial effects of the face cover 10 of any of the above embodiments.

[0180] Specifically, the cooking appliance includes an induction cooker, a multi-head stove, etc.

[0181] Optionally, the cooking appliance further includes a housing and a coil disk. The housing is provided with an installation cavity with an opening at the top. The coil disk is disposed in the installation cavity, and the face cover 10 is covered on the opening of the housing and is located above the coil disk. Specifically, the second surface of the face cover 10 is disposed opposite to the coil disk.

[0182] The coil disk can be an electromagnetic coil disk. A cookware is placed on the face cover 10, and the coil disk can heat the food ingredients in the cookware.

[0183] This embodiment provides a face cover 10. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0184] The cooking appliance provided by the present invention can be an induction cooker, and the induction cooker includes the face cover 10 in any of the above embodiments. The face cover 10 of the induction cooker includes a panel 100 and a support member 200. The panel 100 includes a base body 110 and a covering layer 120. The base body 110 is a ceramic base body, and the covering layer 120 is a glaze layer. Below the panel 100 is the coil disk of the induction cooker.

[0185] Example 1: The thickness of the panel 100 is 6 mm. It meets the national standard requirements for the strength of the burner head and will not crack due to mechanical impact during use. The overall energy efficiency test is 87%, meeting the energy efficiency requirements. The glaze layer of the panel 100 is dense, without through cracks, and the base body 110 of the panel 100 is tightly combined. The glaze layer covers the front and four side surfaces of the base body 110, and there is no water leakage during use.

[0186] Example 2: The thickness of the panel 100 is 4 mm, which meets the national standard for the strength requirements of the burner head and will not crack due to mechanical impact during use. The overall energy efficiency test is 89%, meeting the energy efficiency requirements. The glaze layer of the panel 100 is dense, without through cracks, and the matrix 110 of the panel 100 is closely bonded. The glaze layer covers the front and four sides of the matrix 110, and there is no water leakage during use.

[0187] Comparative Example 1: The thickness of the panel 100 is 2 mm. The overall energy efficiency test is 93%, meeting the energy efficiency requirements. However, due to the excessive thinness of the panel 100, the strength is insufficient, and the panel 100 cracks under normal use conditions, causing customer complaints. The glaze layer of the panel 100 is dense, without through cracks, and the matrix 110 of the panel 100 is closely bonded. The glaze layer covers the front and four sides of the matrix 110, and there is no water leakage during use.

[0188] Comparative Example 2: The thickness of the panel 100 is 9 mm, which meets the national standard for the strength requirements of the burner head and will not crack due to mechanical impact during use. However, due to the excessive distance between the plates, the energy efficiency of the induction cooker can only reach 80%, which does not meet the national standard for the energy efficiency requirements of induction cooker products, so it cannot be sold on the market. The glaze layer of the panel 100 is dense, without through cracks, and the matrix 110 of the panel 100 is closely bonded. The glaze layer covers the front and four sides of the matrix 110, and there is no water leakage during use.

[0189] Comparative Example 3: The thickness of the panel 100 is 6 mm, which meets the national standard for the strength requirements of the burner head and will not crack due to mechanical impact during use. The overall energy efficiency test is 88%, meeting the energy efficiency requirements. The glaze layer of the panel 100 is not dense, and water can seep into the main structure of the panel 100 from the glaze layer. During normal use, the induction cooker will report an error due to water seepage in the panel 100 and cannot be used normally.

[0190] Comparative Example 4: The thickness of the panel 100 is 6 mm, which meets the standard for the strength requirements of the burner head and will not crack due to mechanical impact during use. The overall energy efficiency test is 87%, meeting the energy efficiency requirements. The glaze layer of the panel 100 is dense, without through cracks, and the matrix 110 of the panel 100 is closely bonded. The glaze layer only covers the front of the panel 100, and the four sides are not covered with the glaze layer. During normal use, the induction cooker will report an error due to water seepage on the four sides of the panel 100 and cannot be used normally.

[0191] In the claims, the description and the drawings of the present invention, the term "a plurality of" means two or more, unless otherwise explicitly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for more conveniently describing the present invention and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation, be constructed and operated in the specific orientation. Therefore, these descriptions should not be construed as limiting the present invention; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances of the above data.

[0192] In the claims, the description and the drawings of the present invention, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, the description and the drawings of the present invention, the schematic representation of the above terms does not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0193] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A face cover, characterized in that, it includes: a substrate, the substrate is provided with a first surface and a second surface, the first surface is located on the first side of the substrate in the thickness direction, and the second surface is arranged around the first surface; a covering layer, the covering layer includes a first covering portion and a second covering portion, the first covering portion is arranged on the first surface, and the second covering portion is arranged on the second surface.

2. The face cover according to claim 1, characterized in that, the materials of the substrate and the covering layer are different; and / or the densities of the substrate and the covering layer are different; and / or the coefficients of thermal expansion of the substrate and the covering layer are different.

3. The face cover according to claim 1, characterized in that, the temperatures that the substrate and the covering layer can withstand are greater than or equal to a first temperature.

4. The face cover according to claim 1, characterized in that, the substrate is a ceramic substrate and the covering layer is a glaze layer.

5. The face cover according to claim 1, characterized in that, the sum of the thickness of the substrate and the thickness of the covering layer is greater than or equal to 3 mm and less than or equal to 8 mm.

6. The face cover according to claim 1, characterized in that, the crystal phase of the substrate includes a magnesium-aluminum-silicon-oxygen crystal phase; and / or the crystal phase of the covering layer includes a lithium-aluminum-silicon-oxygen crystal phase.

7. The face cover according to claim 1, characterized in that, the material of the substrate includes: magnesium element, the mass percentage of the magnesium element is greater than or equal to 2% and less than or equal to 10%; aluminum element, the mass percentage of the aluminum element is greater than or equal to 10% and less than or equal to 20%; silicon element, the mass percentage of the silicon element is greater than or equal to 15% and less than or equal to 30%; oxygen element, the mass percentage of the oxygen element is greater than or equal to 40% and less than or equal to 60%.

8. The face cover according to claim 1, characterized in that, the material of the covering layer includes: lithium element, the mass percentage of the lithium element is greater than or equal to 0.1% and less than or equal to 5%; magnesium element, the mass percentage of the magnesium element is greater than or equal to 0 and less than or equal to 8%; aluminum element, the mass percentage of the aluminum element is greater than or equal to 5% and less than or equal to 15%; silicon element, the mass percentage of the silicon element is greater than or equal to 20% and less than or equal to 40%; oxygen element, the mass percentage of the oxygen element is greater than or equal to 50% and less than or equal to 70%.

9. The face cover according to claim 1, characterized in that, the density of the covering layer is greater than the density of the substrate.

10. The face cover according to any one of claims 1 to 9, characterized in that, the second covering portion is connected to the first covering portion, a first chamfering portion is provided between the first covering portion and the second covering portion, and the first angle between the surface of the first chamfering portion and the second covering portion is greater than or equal to 0.1 degree and less than 180 degrees; and / or there is a second chamfering portion between the first surface and the second surface, and the second angle between the second chamfering portion and the second surface is greater than or equal to 0.1 degree and less than 180 degrees.

11. The face cover according to any one of claims 1 to 9, characterized in that, it includes: A support member, the support member being disposed on a second side of the base body in the thickness direction, the second side being disposed opposite to the first side; A control member, the control member being connected to the support member.

12. The face cover according to any one of claims 1 to 9, characterized in that the base body is provided with a first hole; the covering layer further includes a third covering portion, the third covering portion being disposed on the inner wall of the first hole.

13. The face cover according to any one of claims 1 to 9, characterized in that the covering layer is attached to the base body.

14. The face cover according to any one of claims 1 to 9, characterized in that the covering layer and the base body are of an integrally sintered molded structure.

15. A stove, characterized in that it includes the face cover according to any one of claims 1 to 14.

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