Multifunctional coated cover plate

Abstract

The utility model discloses a multifunctional coated cover plate, which relates to the field of cover plates and comprises a base plate, the base plate is provided with a front surface and a back surface, an iron-molybdenum alloy coated layer, an iron-molybdenum carbide coated layer and an iron-titanium alloy coated layer are sequentially laminated on the front surface of the base plate, and a thermochromic ink layer and a protective layer are sequentially laminated on the back surface of the base plate. The color of the thermochromic ink layer can be changed at different temperatures; the iron-titanium alloy coating layer, the iron-molybdenum carbide coating layer and the iron-molybdenum alloy coating layer in the front coating layer have a synergistic effect to form an unbreakable protective barrier, and the thermochromic ink layer increases the interestingness and interactivity of the product, can effectively prevent the thermochromic ink layer from being scratched, ensures the lasting attractive appearance of patterns, and improves the product quality. The whole coating layer structure realizes tight combination and performance complementation among all the layers, the multifunctionality of the cover plate is improved, the comprehensive performance of the cover plate is improved, and the high requirement of high-end electronic products for the performance of the cover plate is met.

Description

Technical Field

[0001] This utility model relates to the field of cover plate technology, and in particular to a multifunctional coated cover plate. Background Technology

[0002] With the advancement of technology, cover plates, combined with a variety of coating layers, are playing an increasingly important role in many fields, such as optics, electronics, and mechanics, especially in electronic devices such as mobile phones, computers, and tablets.

[0003] Chinese patent application number 202121214346.3 discloses an ultra-low coefficient of friction mobile phone cover glass, comprising a glass cover body, which includes a glass base layer and a coating. The coating is located on top of the glass base layer and includes a high-strength film, a scratch-resistant film, and a friction-resistant film. The friction-resistant film is located on top of the scratch-resistant film, and the scratch-resistant film is located on top of the high-strength film. This cover glass has good fire resistance, high physical strength, good mechanical properties, and good resistance to water, alkali, and acid. The high-strength film has high strength, good rigidity, transparency, and high gloss. The scratch-resistant film has strong durability, robustness, high toughness, moisture resistance, high temperature resistance, and low temperature resistance. The friction-resistant film has high wear resistance and scratch resistance. A limiting piece facilitates the installation of the glass cover body, solving the problems of poor wear resistance and scratch resistance of traditional mobile phone cover glass.

[0004] However, with the popularization of electronic products and their increasingly rich functions, the requirements for glass covers are also constantly improving. Traditional glass covers are insufficient in terms of aesthetics and personalization, making it difficult to meet the market's demand for high-quality, high-value-added products. This is especially true in the field of handheld devices such as smartphones and tablets, where users place particular emphasis on product appearance and personalized expression, which existing covers cannot satisfy. Therefore, this utility model discloses a multifunctional coated cover to solve the above problems. Utility Model Content

[0005] Therefore, it is necessary to provide a multifunctional coated cover plate to address the aforementioned technical problems. The iron-titanium alloy coating layer, the iron-molybdenum carbide coating layer, and the iron-molybdenum alloy coating layer in the front coating layer work together to form an indestructible protective barrier. Through precise process control, the entire coating layer structure achieves tight bonding and complementary performance between the layers, improving the multifunctionality of the cover plate, enhancing its overall performance, and meeting the high performance requirements of high-end electronic products for cover plates.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A multifunctional coated cover plate includes a substrate having a front side and a back side. The front side of the substrate is provided with an iron-molybdenum alloy coating layer, an iron-molybdenum carbide coating layer and an iron-titanium alloy coating layer stacked sequentially. The back side of the substrate is provided with a thermochromic ink layer and a protective layer stacked sequentially. The thermochromic ink layer can change color at different temperatures.

[0008] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, the substrate is a transparent glass plate.

[0009] In a preferred embodiment of the multifunctional coated cover provided by this utility model, the thickness of the iron-molybdenum alloy coating layer is 30-50 nanometers, the thickness of the iron-molybdenum carbide coating layer is 60-80 nanometers, and the thickness of the iron-titanium alloy coating layer is 60-70 nanometers.

[0010] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, the thickness of the thermochromic ink layer is 6-9 micrometers.

[0011] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, the protective layer includes an iron carbide layer and a molybdenum carbide layer, wherein the iron carbide layer covers the surface of the thermochromic ink layer, and the molybdenum carbide layer covers the surface of the iron carbide layer.

[0012] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, the thickness of the iron carbide layer is 10-20 nanometers, and the thickness of the molybdenum carbide layer is 20-30 nanometers.

[0013] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, the substrate includes a visible area and an invisible area arranged around the visible area, and the thermochromic ink layer is disposed in the invisible area.

[0014] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, a black ink layer surrounding the thermochromic ink layer is provided on the back side of the substrate in the invisible area, and the protective layer covers the black ink layer.

[0015] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, the back of the substrate is provided with a shallow etching groove, and the thermochromic ink layer is disposed in the shallow etching groove.

[0016] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, the bottom of the etched shallow groove is etched with a patterned groove, the thermochromic ink layer is disposed in the patterned groove, and the bottom of the etched shallow groove, which avoids the patterned groove, is provided with a black ink layer.

[0017] In a preferred embodiment of the multifunctional coated cover plate provided by this utility model, the etching depth of the shallow etching groove and the patterned groove is 6-15 micrometers, and the etching depth of the patterned groove is greater than that of the shallow etching groove.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model provides a multifunctional coated cover plate. It uses a high-strength, corrosion-resistant iron-titanium alloy coating layer as a wear-resistant layer, while an iron-molybdenum carbide coating layer further enhances hardness and wear resistance. The iron-molybdenum alloy coating layer serves as a transition layer, strengthening the bond with other coating layers and improving overall thermal conductivity and mechanical strength. The iron-titanium alloy, iron-molybdenum carbide, and iron-molybdenum alloy coating layers on the front work synergistically to form an indestructible protective barrier. The thermochromic ink layer on the back of the substrate increases the product's fun and interactivity, improving user experience and aesthetics. The protective layer covers and protects the thermochromic ink layer, effectively preventing scratches and ensuring the long-lasting beauty of the pattern. Through precise process control, the entire coating structure achieves tight bonding and complementary performance between layers, improving the cover plate's multifunctionality and overall performance, meeting the high performance requirements of high-end electronic products. Attached Figure Description

[0020] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A side view of the multifunctional coated cover plate provided by this utility model;

[0022] Figure 2 A plan view of the multifunctional coated cover plate provided by this utility model;

[0023] Figure 3 A schematic diagram of the screen printing of thermochromic ink in the multifunctional coated cover plate provided by this utility model;

[0024] Figure 4 A side view of Embodiment 2 of the multifunctional coated cover plate provided by this utility model;

[0025] Figure 5 A plan view of Embodiment 2 of the multifunctional coated cover plate provided by this utility model;

[0026] Figure 6A schematic diagram of the thermochromic ink screen printing in Embodiment 2 of the multifunctional coated cover plate provided by this utility model;

[0027] Figure 7 A plan view of Embodiment 3 of the multifunctional coated cover plate provided by this utility model;

[0028] Figure 8 A schematic diagram of the thermochromic ink screen printing in Embodiment 3 of the multifunctional coated cover plate provided by this utility model.

[0029] The markings in the diagram are explained as follows:

[0030] 1. Substrate; 11. Visible area; 12. Non-visible area; 2. Iron-molybdenum alloy coating layer; 3. Iron-molybdenum carbide coating layer; 4. Iron-titanium alloy coating layer; 5. Thermochromic ink layer; 6. Iron carbide layer; 7. Molybdenum carbide layer; 8. Black ink layer; 9. Etched shallow groove; 10. Pattern groove. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0032] As described in the background art, with the popularization of electronic products and the increasing richness of their functions, the requirements for glass covers are also constantly improving. Traditional glass covers are insufficient in terms of aesthetics and personalization, making it difficult to meet the market's demand for high-quality, high-value-added products. This is especially true in the field of handheld devices such as smartphones and tablets, where users pay particular attention to product appearance and personalized expression, which existing covers cannot satisfy.

[0033] To solve this technical problem, this utility model provides a multifunctional coated cover plate, which is applied in the field of cover plates.

[0034] For details, please refer to Figure 1-3 The multifunctional coated cover plate specifically includes a substrate 1, which has a front side and a back side. The front side of the substrate 1 is sequentially stacked with an iron-molybdenum alloy coating layer 2, an iron-molybdenum carbide coating layer 3, and an iron-titanium alloy coating layer 4. The back side of the substrate 1 is sequentially stacked with a thermochromic ink layer 5 and a protective layer. The thermochromic ink layer 5 can change color at different temperatures.

[0035] The multifunctional coated cover plate provided by this utility model uses a high-strength and corrosion-resistant iron-titanium alloy coating layer 4 as a wear-resistant layer, an iron-molybdenum carbide coating layer 3 to further enhance hardness and wear resistance, and an iron-molybdenum alloy coating layer 2 as a transition layer to enhance the bonding force with other coating layers and improve overall thermal conductivity and mechanical strength. The iron-titanium alloy coating layer 4, iron-molybdenum carbide coating layer 3, and iron-molybdenum alloy coating layer 2 in the front coating layer work together to form an indestructible protective barrier. The thermochromic ink layer 5 on the back of the substrate 1 increases the fun and interactivity of the product, improves the user experience, and enhances the product's aesthetics. The protective layer covers and protects the thermochromic ink layer 5, effectively preventing scratches and ensuring the long-lasting beauty of the pattern. Through precise process control, the entire coating layer structure achieves tight bonding and complementary performance between the layers, improving the multifunctionality and overall performance of the cover plate, and meeting the high performance requirements of high-end electronic products.

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0037] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] Example 1

[0040] Please refer to Figure 1-3 A multifunctional coated cover plate is provided, comprising a substrate 1 having a front and a back. The front of the substrate 1 is sequentially stacked with an iron-molybdenum alloy coating layer 2, an iron-molybdenum carbide coating layer 3, and an iron-titanium alloy coating layer 4. The iron-molybdenum alloy coating layer 2 is bonded to the front of the substrate 1. The iron-molybdenum carbide coating layer 3 is coated on the surface of the iron-molybdenum alloy coating layer 2, and the iron-titanium alloy coating layer 4 is coated on the surface of the iron-molybdenum carbide coating layer 3. The back of the substrate 1 is sequentially stacked with a thermochromic ink layer 5 and a protective layer. The thermochromic ink layer 5 can change color at different temperatures.

[0041] Substrate 1 serves as the base for the coating layer, providing basic transparency and structural support. Substrate 1 can be a transparent glass plate or a transparent acrylic plate. In this example, substrate 1 is a transparent glass plate. Of course, when substrate 1 is used in a display device, it can also be made of a flexible transparent material, allowing the cover to be folded. This makes it suitable for flexible and foldable display device accessories. It can be made of transparent, soft, and foldable materials such as UTG (Ultra Thin Glass), CPI (Colorless Polyimide), and PET (Polyethylene Terephthalate).

[0042] The thickness of the iron-molybdenum alloy coating layer 2 is 30-50 nanometers, the thickness of the iron-molybdenum carbide coating layer 3 is 60-80 nanometers, and the thickness of the iron-titanium alloy coating layer 4 is 60-70 nanometers. The iron-titanium alloy in the iron-titanium alloy coating layer 4 combines the excellent properties of iron and titanium, possessing high strength, good corrosion resistance, and a certain degree of hardness, and can serve as a wear-resistant layer to protect the glass cover. The iron-molybdenum carbide in the iron-molybdenum carbide coating layer 3 has high hardness, good wear resistance, and corrosion resistance, which can further enhance the scratch resistance and wear resistance of the cover. The iron-molybdenum alloy in the iron-molybdenum alloy coating layer 2 not only has high hardness but also good thermal conductivity and mechanical strength, and can serve as a transition layer to improve the adhesion with the inner coating layer and enhance the overall performance.

[0043] Furthermore, the iron-molybdenum alloy coating layer 2, the iron-molybdenum carbide coating layer 3, and the iron-titanium alloy coating layer 4 are all dense and uniform thin films formed on the surface of the substrate 1 by physical or chemical methods (such as sputtering, evaporation, CVD, etc.).

[0044] Specifically, the Fe2Ti alloy coating is achieved through metal alloy co-deposition using magnetron sputtering. Specifically, it employs a dual-target co-sputtering technique using Fe and Ti. In an argon atmosphere, high-energy particles bombard the target, causing Fe and Ti atoms to sputter onto the substrate surface to form an alloy layer. This sputtering deposition process is mature and suitable for the uniform deposition of metal alloys. Furthermore, the composition can be controlled by adjusting the target power ratio. Alternatively, arc ion plating can be used. This method involves evaporating Fe and Ti targets using an electric arc to generate a highly ionized metal plasma, which is then deposited onto the substrate surface. This method combines high deposition rates with excellent film adhesion, making it particularly suitable for applications requiring high wear resistance.

[0045] In Fe2MoC (iron-molybdenum carbide) coatings, iron-molybdenum carbide is a carbon-containing metal carbide composite layer. A carbon source needs to be introduced to react with the metal. This is achieved using reactive sputtering, specifically employing a dual Fe and Mo target. During sputtering, methane (CH4) or acetylene (C2H2) is introduced as the carbon source. The metal atoms react with carbon on the substrate surface to form a Fe-Mo-C composite carbide layer. By adjusting the gas flow rate and sputtering power, the carbon content and film hardness can be optimized. Alternatively, plasma-enhanced chemical vapor deposition (PECVD) can be used, employing organic precursors of Fe and Mo (such as carbonyl compounds) as raw materials. These precursors decompose in a plasma environment and react with hydrocarbon gases to generate Fe-Mo-C thin films.

[0046] The FeMo alloy coating is prepared using metal co-deposition technology, specifically ion plating. This involves using a dual-cathode arc source with Fe and Mo as the substrate. The metal target is evaporated by the arc, and ion bombardment cleans the substrate surface and enhances film adhesion. This method results in rapid film formation and a dense film, suitable for alloy coatings requiring high adhesion. Alternatively, co-sputtering can be used: Fe and Mo are simultaneously sputtered and deposited in an argon atmosphere. By adjusting the target power and gas pressure, the alloy composition ratio can be precisely controlled, making it suitable for applications requiring high compositional uniformity.

[0047] The thickness of the thermochromic ink layer 5 is 6-9 micrometers. The thermochromic ink layer 5 has a color-changing ink pattern made by screen printing with color-changing ink. The color-changing ink pattern can be a decorative pattern that changes color according to temperature changes, increasing the fun and interactivity of the product. At the same time, the screen printing process is flexible and can design a variety of patterns and colors, enhancing the aesthetics of the product.

[0048] The protective layer includes an iron carbide layer 6 and a molybdenum carbide layer 7. The iron carbide layer 6 covers the surface of the thermochromic ink layer 5, and the molybdenum carbide layer 7 covers the surface of the iron carbide layer 6. The thickness of the iron carbide layer 6 is 10-20 nanometers, and the thickness of the molybdenum carbide layer 7 is 20-30 nanometers. As a protective layer, the iron carbide can effectively prevent the ink layer from being scratched. At the same time, its high hardness also enhances the scratch resistance of the cover plate. The molybdenum carbide also has high hardness and excellent wear resistance, which can further protect the area under the ink layer and ensure the durability and aesthetics of the ink pattern. The iron carbide layer 6 and the molybdenum carbide layer 7 are also coating layers, which form a dense and uniform thin film on the surface of the substrate 1 through physical or chemical methods (such as sputtering, vapor deposition, CVD, etc.).

[0049] The iron carbide layer is prepared by chemical vapor deposition. The precursor is carbonyl iron (such as Fe(CO)5) and carbon source (such as CH4). Process conditions: temperature: 300-500℃ (high temperature resistant glass, such as quartz glass is required). H2 / Ar mixed gas is introduced to promote the decomposition of Fe(CO)5 into Fe and CO. CH4 cracking provides active carbon, which reacts with Fe to generate Fe3C.

[0050] The molybdenum carbide layer was prepared by reactive sputtering with a molybdenum target and an Ar / CH4 mixed gas. Parameter control: the CH4 ratio and sputtering power were adjusted to allow Mo to react with C to generate Mo2C. Substrate cooling: the glass temperature was kept below 200°C to avoid softening.

[0051] It is understood that the materials and processes used to prepare the above-mentioned membranes are existing technologies, and this invention has not improved them. Other preparation processes can also be used, and will not be described in detail here.

[0052] The substrate 1 includes a visible area 11 and a non-visible area 12 arranged around the visible area 11. A thermochromic ink layer 5 is disposed in the non-visible area 12. The thermochromic ink layer 5 is disposed in the entire non-visible area 12 on the back side of the substrate 1. When the cover plate is used as a display cover plate, the color change of the thermochromic ink layer will not affect the display effect.

[0053] The multifunctional coated cover plate underwent performance testing, and the test results are as follows:

[0054] Test type Test Project Test methods Test data Reference Standard Front coating layer <![CDATA[Hardness of the Fe2Ti layer]]> Nanoindentation 8-10 GPa ISO14577 Front coating layer <![CDATA[Wear resistance of the Fe2Ti layer]]> Taber Abrasion test (CS-10 wheel, 500g load, 1000 cycles) Haze change ≤2% ASTM D1044 Front coating layer <![CDATA[Corrosion resistance of Fe2Ti layer]]> Salt spray test (5% NaCl solution, 72 hours) No visible corrosion spots ISO 9227 Front coating layer <![CDATA[Hardness of Fe2MoC layer]]> Nanoindentation 12-15 GPa ISO14577 Front coating layer <![CDATA[Adhesion of Fe2MoC layer]]> Cross-cut method (1mm spacing, tape peeling) Level 0 (No detachment) ASTM D3359 Front coating layer <![CDATA[Friction coefficient of Fe2MoC layer]]> <![CDATA[Ball-on-disk friction test (Al2O3 ball, 1 N load, 50 rpm)]]> 0.2-0.3 DIN51834 Front coating layer Thermal conductivity of FeMo layer Laser flare method (LFA) Thermal conductivity 50-60 W / m·K ASTM E1461 Front coating layer FeMo layer bonding strength Tensile bond strength test (with glass substrate) ≥20 MPa ISO 4624 Back coating layer Thermochromic ink layer color change response temperature Temperature control in constant temperature chamber (heating rate 5℃ / min) Color change range: 30-45°C (adjustable) ISO 4624 Back coating layer Durability of thermochromic ink layer UV aging test (UVA-340 lamp, 500 hours) ΔE color difference ≤ 3 ISO4892-3 Back coating layer Hardness of iron carbide / molybdenum carbide protective layer Nanoindentation Iron carbide: 9-11 GPa; Molybdenum carbide: 10-12 GPa ISO14577 Back coating layer Protective effect of iron carbide / molybdenum carbide protective layer ink Steel wool friction test (0000#, 500g load, 100 cycles) No visible scratches on the ink JISK5600 Overall performance Light transmittance Spectrophotometer (380-780nm wavelength) Front light transmittance ≥ 90% (after coating) ISO13468 Overall performance Impact resistance Steel ball drop test (50g steel ball, 1m height) No cracks or plating peeling IEC60068-2-31 Overall performance Environmental stability High and low temperature cycling (-40℃~85℃, 100 cycles) No delamination, cracking, or discoloration IEC60068-2-14

[0055] The test results above show that the multifunctional coated cover plate in this embodiment has good performance in physical properties, optical properties, chemical stability and electrical properties, strong comprehensive performance and fast response speed of the thermochromic ink layer.

[0056] Example 2

[0057] The multifunctional coated cover plate provided in Embodiment 1 is further optimized, specifically, as follows: Figure 4-6 As shown, the back of the substrate 1, in the non-visible area 12, has a black ink layer 8 surrounding the thermochromic ink layer 5. A protective layer covers the black ink layer 8. The back of the substrate 1 also has shallow etching grooves 9, within which the thermochromic ink layer 5 is located. The shallow etching grooves 9 increase the thickness of the thermochromic ink layer 5 and reduce wear, thus maintaining the thermochromic function for a longer period. Multiple shallow etching grooves 9 can be arranged around the visible area 11 to further enhance aesthetics and functionality. Different temperature-sensitive color-changing inks can be etched within each shallow etching groove 9, resulting in different color changes on the cover at different temperatures, increasing the product's appeal and providing an indication function for the user. The color-changing ink layer can be a temperature label or other patterns for easy viewing. The black ink layer 8 also acts as a light-shielding element. The black ink layer 8 and the thermochromic ink layer 5 are prepared using screen printing or inkjet printing.

[0058] Example 3

[0059] The multifunctional coated cover plate provided in Example 2 has been further optimized, specifically, as follows: Figure 7-8 As shown, the bottom of the shallow etching groove 9 is etched with a patterned groove 10. In this example, the patterned groove 10 is a logo pattern. The thermochromic ink layer 5 is located inside the patterned groove 10. The bottom of the shallow etching groove 9, which avoids the patterned groove 10, is provided with a black ink layer 8, so that the thermochromic ink layer 5 is only screen-printed inside the patterned groove 10, forming a color-changing pattern on the surface of the cover plate, increasing the aesthetics. The etching depth of the shallow etching groove 9 and the patterned groove 10 is 6-15 micrometers, and the etching depth of the patterned groove 10 is greater than the etching depth of the shallow etching groove 9.

[0060] The working principle of the multifunctional coated cover provided by this utility model is as follows: A strong scratch-resistant barrier is formed by the iron-titanium alloy coating layer 4, the iron-molybdenum carbide coating layer 3, the iron-molybdenum alloy coating layer 2, the iron carbide layer 6, and the molybdenum carbide layer 7. This ensures that the cover maintains a smooth and undamaged surface under various usage conditions. Each layer has high hardness, significantly improving the cover's wear resistance and extending its service life. The thermochromic ink increases the product's fun and interactivity, enhancing the user experience. At the same time, diverse pattern and color designs also improve the product's aesthetics. The iron carbide and molybdenum carbide layers 7, as inner protective layers, effectively prevent scratches on the ink layer, ensuring the durability and aesthetics of the ink pattern. Through precise process control, the entire coating structure achieves a tight bond and complementary performance between the layers, improving the cover's multifunctionality and overall performance, meeting the high performance requirements of high-end electronic products.

[0061] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A multi-functional coated cover plate comprising a substrate having a front side and a back side, characterized in that, The front side of the substrate is sequentially stacked with an iron-molybdenum alloy coating layer, an iron-molybdenum carbide coating layer, and an iron-titanium alloy coating layer. The back side of the substrate is sequentially stacked with a thermochromic ink layer and a protective layer. The thermochromic ink layer can change color at different temperatures.

2. The multifunctional coated cover plate according to claim 1, wherein, The thickness of the iron-molybdenum alloy coating layer is 30-50 nanometers, the thickness of the iron-molybdenum carbide coating layer is 60-80 nanometers, and the thickness of the iron-titanium alloy coating layer is 60-70 nanometers.

3. The multi-functional coated cover plate of claim 1, wherein, The thickness of the thermochromic ink layer is 6-9 micrometers.

4. The multi-functional coated cover plate of claim 1, wherein, The protective layer includes an iron carbide layer and a molybdenum carbide layer, wherein the iron carbide layer covers the surface of the thermochromic ink layer, and the molybdenum carbide layer covers the surface of the iron carbide layer.

5. The multi-functional coated cover plate of claim 4, wherein, The thickness of the iron carbide layer is 10-20 nanometers, and the thickness of the molybdenum carbide layer is 20-30 nanometers.

6. The multi-functional coated cover plate of claim 1, wherein, The substrate includes a visible area and a non-visible area surrounding the visible area, and the thermochromic ink layer is disposed in the non-visible area.

7. The multi-functional coated cover plate of claim 6, wherein, The back of the substrate has a black ink layer surrounding the thermochromic ink layer in an unseen area, and the protective layer covers the black ink layer.

8. The multi-functional coated cover plate of claim 7, wherein, The back of the substrate is provided with shallow etching grooves, and the thermochromic ink layer is disposed in the shallow etching grooves.

9. The multi-functional coated cover plate of claim 8, wherein, The bottom of the shallow etching groove is etched with patterned grooves, the thermochromic ink layer is disposed within the patterned grooves, and a black ink layer is disposed on the part of the bottom of the shallow etching groove that avoids the patterned grooves.

10. The multi-functional coated cover plate of claim 9, wherein, The etching depth of the shallow etching groove and the patterned groove is 6-15 micrometers, and the etching depth of the patterned groove is greater than that of the shallow etching groove.

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