Low-transmittance low-reflection coated glass

Abstract

The invention discloses low-transmittance and low-reflection coated glass which comprises a glass substrate, a plurality of composite dielectric layers and a plurality of niobium-containing infrared reflecting layers, one composite dielectric layer is arranged on the outer side of the glass substrate, and the niobium-containing infrared reflecting layers and the other composite dielectric layers are alternately arranged on the outer side of the composite dielectric layer. The number of the niobium-containing infrared reflecting layers is larger than or equal to three, and the number of the composite dielectric layers is larger than that of the niobium-containing infrared reflecting layers; the glass can be used for automobile sunscreen glass and automobile rear windshield glass and can be used in a single piece, white glass can be used for replacing colored glass, and a transparent film can be used for replacing a heat insulation gray film, so that the stability of product quality is improved, and secondary radiation generated by heat absorption of the glass is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat-reflective glass, and in particular to a low-transmittance and low-reflection coated glass. Background Art

[0002] In the field of new energy vehicles, skylight glass has overturned traditional design and is more in line with the new energy vehicle's demand for a sense of technology and the future, as well as the original intention of designing for energy conservation and environmental protection. Therefore, panoramic skylights are widely used in the current new energy vehicle market. In addition, current new energy vehicles have lower requirements for the transmittance of the rear window, while increasing requirements for its energy-saving effect. Current new energy vehicle energy-saving glass generally uses double-silver or triple-silver low-e glass, which is directly laminated with online or offline insulation products to prepare sunshade panoramic skylights. In order to prevent oxidation, this type of silver-containing film layer needs to be laminated, but its thermal insulation effect is It will be lost and needs to be compounded with dark gray glass and dark heat-absorbing film. Although the "static shading value" is low, it plays a certain shading role and also has certain energy-saving and heat-insulating properties. However, due to the strong secondary radiation energy of dark gray glass and heat-absorbing film, after the car is in a static state for a long time, the gray original glass and heat-absorbing film will absorb a lot of heat and radiate into the car in the form of secondary radiation, causing the temperature inside the car to rise sharply. At this time, when the driver and passengers start the vehicle again, the body temperature is higher than that in a conventional car, which greatly affects the riding experience of the driver and passengers. At the same time, the self-explosion rate of colored glass is high, and the color stability of colored film is poor. It is easy to fade after long-term use, and the quality control is difficult. Compared with white glass and ordinary film, there are certain disadvantages, which leads to high processing costs and long production cycles for such products, which are difficult to meet market demand. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a low-transmittance and low-reflection coated glass, which can be used for automobile skylight glass and automobile rear windshield glass, can be used in a single piece, can replace colored glass with white glass, and replace heat-insulating gray film with transparent film, thereby improving the stability of product quality and reducing the secondary radiation generated by heat absorption of glass.

[0004] An embodiment of the present application provides a low-transmittance and low-reflection coated glass, comprising a glass substrate, a plurality of composite dielectric layers and a plurality of niobium-containing infrared reflective layers, wherein one of the composite dielectric layers is arranged on the outside of the glass substrate, the niobium-containing infrared reflective layers and the remaining composite dielectric layers are alternately arranged on the outside of the composite dielectric layer, the number of niobium-containing infrared reflective layers is greater than or equal to three layers, and the number of composite dielectric layers is greater than the number of niobium-containing infrared reflective layers.

[0005] Further, the coated glass includes three layers of the niobium-containing infrared reflection layer, namely a first niobium-containing infrared reflection layer, a second niobium-containing infrared reflection layer and a third niobium-containing infrared reflection layer. Correspondingly, the coated glass includes four layers of the composite dielectric layer, namely a bottom composite dielectric layer, a second composite dielectric layer, a third composite dielectric layer and a fourth composite dielectric layer, wherein the bottom composite dielectric layer, the first niobium-containing infrared reflection layer, the second composite dielectric layer, the second niobium-containing infrared reflection layer, the third composite dielectric layer, the third niobium-containing infrared reflection layer and the fourth composite dielectric layer are sequentially stacked and arranged on the outer side of the glass substrate.

[0006] Further, the thickness of the first niobium-containing infrared reflective layer is greater than the thickness of the third niobium-containing infrared reflective layer, and the thickness of the second niobium-containing infrared reflective layer is greater than or equal to the sum of the thicknesses of the first niobium-containing infrared reflective layer and the third niobium-containing infrared reflective layer.

[0007] Further, the thickness of the bottom composite dielectric layer is 40nm-65nm, the thickness of the first niobium-containing infrared reflective layer is 7nm-17nm, the thickness of the second composite dielectric layer is 55nm-70nm, the thickness of the second niobium-containing infrared reflective layer is 15nm-45nm, the thickness of the third composite dielectric layer is 45nm-60nm, the thickness of the third niobium-containing infrared reflective layer is 5nm-15nm, and the thickness of the fourth composite dielectric layer is 50nm-70nm.

[0008] Furthermore, the niobium material of the niobium-containing infrared reflective layer is single substance niobium or a niobium alloy containing niobium of not less than 85 wt%.

[0009] Further, the composite dielectric layer is one of silicon nitride, silicon oxynitride, niobium oxide, zirconium silicon nitride, tin oxide, zinc oxide or zirconium silicon oxynitride; or, the composite dielectric layer is a composite of at least two of silicon nitride, silicon oxide, silicon oxynitride, niobium oxide, zirconium silicon nitride, tin oxide, zinc oxide or zirconium silicon oxynitride.

[0010] Furthermore, the coated glass further comprises a protective layer, which is arranged on the outer side of the composite medium layer located at the outermost layer, and the thickness of the protective layer is less than or equal to 3 nm.

[0011] Furthermore, the protective layer is at least one of zirconium oxide, silicon carbide and DLC.

[0012] Furthermore, the glass substrate comprises white glass.

[0013] Furthermore, the coated glass comprises multiple layers of the glass substrate, the multiple layers of the glass substrate are prepared into a laminated glass, and the composite medium layer and the niobium-containing infrared reflective layer are located on the outside of the laminated glass.

[0014] The present application proposes a low-transmittance and low-reflection coated glass. Compared with the prior art, its beneficial effects are:

[0015] The low-transmittance and low-reflection coated glass comprises a glass substrate, a plurality of composite dielectric layers and a plurality of niobium-containing infrared reflection layers, wherein one composite dielectric layer is arranged on the outer side of the glass substrate, the niobium-containing infrared reflection layer and the remaining composite dielectric layers are alternately arranged on the outer side of the composite dielectric layer, the number of niobium-containing infrared reflection layers is greater than or equal to three layers, and the number of composite dielectric layers is greater than the number of niobium-containing infrared reflection layers; the application sets a plurality of niobium-containing infrared reflection layers and a plurality of composite dielectric layers, which can effectively reduce the emissivity and the glass surface resistance, and effectively increase the thermal insulation performance of the glass substrate; the glass substrate uses a niobium-containing infrared reflection layer, which can effectively improve the oxidation resistance of the glass substrate film layer, the film layer adhesion, the product weather resistance and processing adaptability, and replace the precious metal ITO and silver, which can effectively reduce the material cost.

[0016] The present application can be used for automobile skylight glass and automobile rear windshield glass, can be used as a single piece, and can use white glass to replace colored glass, and transparent film to replace heat-insulating gray film, thereby improving the stability of product quality and reducing the secondary radiation generated by heat absorption of the glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a film structure of one embodiment of the present application;

[0018] Figure 2 for Figure 1 A schematic diagram showing a protective layer being added to the outer side of the membrane structure shown in FIG.

[0019] Figure 3 A schematic diagram of a film structure of one embodiment of the present application;

[0020] Figure 4 for Figure 3 A schematic diagram showing a protective layer being added to the outer side of the membrane structure shown in FIG.

[0021] Figure 5 A schematic diagram of a film structure of one embodiment of the present application;

[0022] Figure 6 for Figure 5 A schematic diagram showing a protective layer being added to the outer side of the membrane structure shown in FIG.

[0023] The meanings of the reference numerals are as follows:

[0024] 1. Glass substrate; 2. Bottom composite dielectric layer; 3. First niobium-containing infrared reflection layer; 4. Second composite dielectric layer; 5. Second niobium-containing infrared reflection layer; 6. Third composite dielectric layer; 7. Third niobium-containing infrared reflection layer; 8. Fourth composite dielectric layer; 9. Absorption layer; 10. Protection layer. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, upper, lower, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] like Figure 1-Figure 6 As shown in, the coated glass product involved in the present application can be used for automobile skylight glass and automobile rear windshield glass, and can be used as a single piece, or white glass can be used to replace colored glass, and transparent film can be used to replace insulating gray film, thereby improving the stability of product quality, reducing the secondary radiation generated by the glass absorbing heat, and realizing the replacement of double-film structure with a single-film structure.

[0028] The embodiment of the present application proposes a low-transmittance and low-reflection coated glass, comprising a glass substrate 1, a plurality of composite dielectric layers and a plurality of niobium-containing infrared reflective layers, wherein one of the composite dielectric layers is arranged on the outside of the glass substrate 1, the niobium-containing infrared reflective layers and the remaining composite dielectric layers are alternately arranged on the outside of the composite dielectric layer, the number of niobium-containing infrared reflective layers is greater than or equal to three layers, and the number of composite dielectric layers is greater than the number of niobium-containing infrared reflective layers.

[0029] The glass substrate 1 includes clear glass.

[0030] The coated glass comprises multiple layers of the glass substrate 1, the multiple layers of the glass substrate 1 are prepared into a laminated glass, and the composite medium layer and the niobium-containing infrared reflective layer are located on the outside of the laminated glass, that is, on the side away from the laminated glass film.

[0031] The present application sets up multiple niobium-containing infrared reflection layers and multiple composite dielectric layers, which can effectively reduce the emissivity and glass surface resistance, and effectively increase the thermal insulation performance of the glass substrate 1. The glass substrate 1 uses a niobium-containing infrared reflection layer, which can effectively improve the oxidation resistance, film adhesion, product weather resistance and processing adaptability of the glass substrate 1 film, and replace the precious metal ITO and silver, which can effectively reduce the material cost.

[0032] The coated glass includes three layers of the niobium-containing infrared reflection layer, namely, a first niobium-containing infrared reflection layer 3, a second niobium-containing infrared reflection layer 5, and a third niobium-containing infrared reflection layer 7. Correspondingly, the coated glass includes four layers of the composite dielectric layer, namely, a bottom composite dielectric layer 2, a second composite dielectric layer 4, a third composite dielectric layer 6, and a fourth composite dielectric layer 8. The bottom composite dielectric layer 2, the first niobium-containing infrared reflection layer 3, the second composite dielectric layer 4, the second niobium-containing infrared reflection layer 5, the third composite dielectric layer 6, the third niobium-containing infrared reflection layer 7, and the fourth composite dielectric layer 8 are sequentially stacked and arranged on the outer side of the glass substrate 1.

[0033] The coated glass comprises three niobium-containing infrared reflection layers, has an emissivity of less than 0.2, and can be used in a single piece.

[0034] The thickness of the first niobium-containing infrared reflective layer 3 is greater than that of the third niobium-containing infrared reflective layer 7 , and the thickness of the second niobium-containing infrared reflective layer 5 is greater than or equal to the sum of the thicknesses of the first niobium-containing infrared reflective layer 3 and the third niobium-containing infrared reflective layer 7 .

[0035] By increasing the thickness of the second niobium-containing infrared reflective layer 5 , the glass surface of the coated glass can significantly reduce the light reflectivity, thus meeting the requirement of low reflectivity.

[0036] One of the product forms of the present application: adopts a niobium-containing infrared reflective layer instead of a silver-containing film layer to achieve single-piece performance, has dual properties of sunshade and heat insulation, does not require an interlayer or a thermal insulation film layer, reduces costs, and has a wide range of application scenarios.

[0037] One of the product forms of the present application: the film layer can be coated on white glass and prepared into laminated glass with a transparent film and a piece of white glass. The prepared laminated glass has a transmittance of less than 4%, a glass surface reflection of less than 20%, a shading value Sc of less than 0.15, and a transmitted color of neutral color, which is more beautiful.

[0038] The thickness of the bottom composite dielectric layer 2 is 40nm-65nm, the thickness of the first niobium-containing infrared reflection layer 3 is 7nm-17nm, the thickness of the second composite dielectric layer 4 is 55nm-70nm, the thickness of the second niobium-containing infrared reflection layer 5 is 15nm-45nm, the thickness of the third composite dielectric layer 6 is 45nm-60nm, the thickness of the third niobium-containing infrared reflection layer 7 is 5nm-15nm, and the thickness of the fourth composite dielectric layer 8 is 50nm-70nm.

[0039] One of the preferred embodiments of the present application: the thickness of the bottom composite dielectric layer 2, the thickness of the first niobium-containing infrared reflection layer 3, the thickness of the second composite dielectric layer 4, the thickness of the second niobium-containing infrared reflection layer 5, the thickness of the third composite dielectric layer 6, the thickness of the third niobium-containing infrared reflection layer 7 and the thickness of the fourth composite dielectric layer 8 are preferably 55nm, 12nm, 60nm, 24nm, 55nm, 7nm and 60nm respectively.

[0040] The niobium material of the niobium-containing infrared reflection layer is single substance niobium or a niobium alloy containing niobium of not less than 85wt%.

[0041] The niobium alloy may be at least one of niobium zirconium, niobium titanium and niobium nickel, wherein the niobium content is not less than 85wt%.

[0042] A low-emissivity film can be deposited on the glass surface by vacuum magnetron sputtering. The film structure includes at least one metal functional layer containing niobium. The use of single niobium or a niobium alloy containing not less than 85wt% niobium can effectively improve the film's oxidation resistance, film adhesion, product weather resistance and processing adaptability.

[0043] The composite dielectric layer is one of silicon nitride, silicon oxynitride, niobium oxide, zirconium silicon nitride, tin oxide, zinc oxide or zirconium silicon oxynitride; or, the composite dielectric layer is a composite of at least two of silicon nitride, silicon oxide, silicon oxynitride, niobium oxide, zirconium silicon nitride, tin oxide, zinc oxide or zirconium silicon oxynitride.

[0044] The present application can adopt an offline Low-E plating method to simultaneously achieve ultra-low emissivity thermal insulation performance and single-piece usability, solving the problem that offline plating cannot be used single-piece and the problem that online Low-E emissivity is relatively high.

[0045] The present application can optimize and combine the interlayer efficacy subdivision of the material selection and thickness of each film layer, so that the emissivity of the glass is reduced, the adjustable range of color diversity is improved, and the heat resistance and firmness of the entire film layer structure are improved. At the same time, the transmission color can be flexibly adjusted by matching multiple material film layers in different bands. The film layer structure can be used to coat a white glass substrate to replace the coating color of colored glass, thereby solving the problem of shortage of colored substrates and high prices affecting delivery time.

[0046] In the above-mentioned embodiment, the materials of the bottom composite dielectric layer 2, the first niobium-containing infrared reflection layer 3, the second composite dielectric layer 4, the second niobium-containing infrared reflection layer 5, the third composite dielectric layer 6, the third niobium-containing infrared reflection layer 7 and the fourth composite dielectric layer 8 are preferably: silicon nitride, niobium-titanium alloy, silicon nitride, niobium-titanium alloy, silicon nitride, niobium-titanium alloy and silicon nitride, respectively.

[0047] It should be emphasized that: the present application may also have more than three niobium-containing infrared reflective layers. Accordingly, more composite dielectric layers need to be provided to pursue lower emissivity and transmittance. The present application may not impose a quantity restriction on the niobium-containing infrared reflective layers. In other words, any product that has niobium-containing infrared reflective layers stacked in quantity falls within the protection scope of the present application.

[0048] The present application can replace colored glass and heat-insulating film with white glass and transparent film, which has less impact on the environment, has good environmental protection, and has low material cost; the present application has low emissivity and low surface resistance, can effectively increase the heat insulation performance, can reduce the air-conditioning load in the car, and is beneficial to environmental protection and energy saving.

[0049] Furthermore, in order to enhance the scratch resistance of the film structure and significantly improve the heat resistance, scratch resistance and ability to adjust visible light transmittance of the film, a protective layer 10 may be added to the outer layer.

[0050] The coated glass further includes a protective layer 10, which is disposed on the outer side of the composite dielectric layer located at the outermost layer, and the thickness of the protective layer 10 is less than or equal to 3 nm.

[0051] The protective layer 10 is at least one of silicon nitride, zirconium oxide, silicon carbide and DLC.

[0052] According to actual conditions, in terms of processing resistance, an outer zirconium oxide protective layer 10 may be added to increase the processing resistance of the overall composite film layer and ensure the consistency and stability of various properties of the final product.

[0053] In other embodiments, the niobium-containing infrared reflection layer of the present application can also be set as two layers; specifically, the embodiment of the present application proposes a low-emissivity coated glass, in which a low-emissivity film layer is coated on the surface of a glass substrate 1 by vacuum magnetron sputtering, and the film layer structure includes two niobium-containing metal functional layers, such as the coated glass can include a glass substrate 1 and a bottom composite dielectric layer 2, a first niobium-containing infrared reflection layer 3, a second composite dielectric layer 4, a second niobium-containing infrared reflection layer 5 and a third composite dielectric layer 6 stacked in sequence on the glass substrate 1.

[0054] In order to ensure the low emissivity requirement, the total thickness of the functional layer needs to be ensured. In order to reduce the visible light reflectivity, in this embodiment, the thickness of the first niobium-containing infrared reflective layer 3 is greater than the thickness of the second niobium-containing infrared reflective layer 5 .

[0055] The thickness of the first niobium-containing infrared reflective layer 3 is less than that of the second niobium-containing infrared reflective layer 5 , and the reflectivity of the glass surface of the glass substrate 1 is reduced, but the color of the film surface is significantly deteriorated, which will affect the appearance of the product.

[0056] A preferred embodiment of the present application: the thickness of the bottom composite dielectric layer 2 is 55nm-75nm, the thickness of the first niobium-containing infrared reflection layer 3 is 15nm-25nm, the thickness of the second composite dielectric layer 4 is 50nm-65nm, the thickness of the second niobium-containing infrared reflection layer 5 is 5nm-15nm, and the thickness of the third composite dielectric layer 6 is 55nm-65nm.

[0057] Furthermore, a protective layer 10 may be provided on the outer layer of this embodiment, and the thickness of the protective layer 10 is less than or equal to 3 nm.

[0058] Preferably, the thickness of the bottom composite dielectric layer 2, the thickness of the first niobium-containing infrared reflective layer 3, the thickness of the second composite dielectric layer 4, the thickness of the second niobium-containing infrared reflective layer 5, the thickness of the third composite dielectric layer 6 and the thickness of the protective layer 10 are 65nm, 20nm, 59nm, 9nm, 58nm and 1nm respectively, and the corresponding materials are silicon nitride, niobium-titanium alloy, silicon nitride, niobium-titanium alloy, silicon nitride and zirconium oxide respectively.

[0059] The coated glass product corresponding to this embodiment includes two niobium-containing infrared reflection layers, has an emissivity less than or equal to 0.25, and a surface resistance value less than 20 ohms / m2, and can be used in a single piece.

[0060] On this basis, in order to further improve the heat resistance of the film layer of the coated glass and adjust the visible light transmittance, at least one absorption layer 9 can be added to the film layer structure to absorb visible light, absorb part of the oxygen during the heat treatment process and adjust the color of the film layer.

[0061] The absorption layer 9 is arranged on the outside of the third composite dielectric layer 6, and an additional fourth composite dielectric layer 8 is required to be added and arranged on the outside of the absorption layer 9, and the thickness of the absorption layer 9 is 10nm-20nm, and the thickness of the fourth composite dielectric layer 8 is 40nm-50nm.

[0062] The absorption layer 9 may be a metal absorption layer 9, such as metal chromium or nickel-chromium alloy, titanium, etc.

[0063] The fourth composite dielectric layer 8 can be silicon nitride, zirconium silicon nitride or the like.

[0064] If the absorption layer 9 is moved onto the second niobium-containing infrared reflection layer 5, although the transmittance is reduced, the reflectivity of the film surface is increased, the color value is also deteriorated, and the overall appearance of the coated glass is deteriorated.

[0065] A preferred embodiment of the present application: the thickness of the bottom composite dielectric layer 2 is 55nm-75nm, the thickness of the first niobium-containing infrared reflection layer 3 is 15nm-25nm, the thickness of the second composite dielectric layer 4 is 50nm-65nm, the thickness of the second niobium-containing infrared reflection layer 5 is 5nm-15nm, the thickness of the third composite dielectric layer 6 is 55nm-65nm, the thickness of the absorption layer 9 is 10nm-20nm, and the thickness of the fourth composite dielectric layer 8 is 40nm-50nm.

[0066] The coated glass product corresponding to this implementation has lower transmittance and the color of the film surface is more beautiful.

[0067] In this embodiment, the thickness of the bottom composite dielectric layer 2, the thickness of the first niobium-containing infrared reflection layer 3, the thickness of the second composite dielectric layer 4, the thickness of the second niobium-containing infrared reflection layer 5, the thickness of the third composite dielectric layer 6, the thickness of the absorption layer 9 and the thickness of the fourth composite dielectric layer 8 are preferably 70nm, 20nm, 50nm, 13nm, 60nm, 15nm and 45nm respectively, and the corresponding materials are silicon nitride, niobium-titanium alloy, silicon nitride, niobium-titanium alloy, silicon nitride, nickel-chromium alloy and zirconium silicon nitride.

[0068] Furthermore, in order to enhance the scratch resistance of the film structure and significantly improve the heat resistance, scratch resistance and ability to adjust visible light transmittance of the film, a protective layer 10 may be added to the outer layer.

[0069] The protective layer 10 is disposed on the outer side of the third composite dielectric layer 6 to improve the scratch resistance of the film structure, and the thickness of the protective layer 10 is less than or equal to 3 nm.

[0070] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0071] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0072] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0073] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A low-transmittance and low-reflection coated glass, characterized in that: The invention comprises a glass substrate, a plurality of composite dielectric layers and a plurality of niobium-containing infrared reflective layers, wherein one of the composite dielectric layers is arranged on the outside of the glass substrate, the niobium-containing infrared reflective layers and the remaining composite dielectric layers are alternately arranged on the outside of the composite dielectric layer, the number of the niobium-containing infrared reflective layers is greater than or equal to three, and the number of the composite dielectric layers is greater than the number of the niobium-containing infrared reflective layers.

2. The low-transmittance and low-reflection coated glass according to claim 1, characterized in that: The coated glass includes three layers of the niobium-containing infrared reflection layer, namely a first niobium-containing infrared reflection layer, a second niobium-containing infrared reflection layer and a third niobium-containing infrared reflection layer. Correspondingly, the coated glass includes four layers of the composite dielectric layer, namely a bottom composite dielectric layer, a second composite dielectric layer, a third composite dielectric layer and a fourth composite dielectric layer. The bottom composite dielectric layer, the first niobium-containing infrared reflection layer, the second composite dielectric layer, the second niobium-containing infrared reflection layer, the third composite dielectric layer, the third niobium-containing infrared reflection layer and the fourth composite dielectric layer are sequentially stacked and arranged on the outer side of the glass substrate.

3. The low-transmittance and low-reflection coated glass according to claim 2, characterized in that: The thickness of the first niobium-containing infrared reflective layer is greater than that of the third niobium-containing infrared reflective layer, and the thickness of the second niobium-containing infrared reflective layer is greater than or equal to the sum of the thicknesses of the first niobium-containing infrared reflective layer and the third niobium-containing infrared reflective layer.

4. The low-transmittance and low-reflection coated glass according to claim 2, characterized in that: The thickness of the bottom composite dielectric layer is 40nm-65nm, the thickness of the first niobium-containing infrared reflection layer is 7nm-17nm, the thickness of the second composite dielectric layer is 55nm-70nm, the thickness of the second niobium-containing infrared reflection layer is 15nm-45nm, the thickness of the third composite dielectric layer is 45nm-60nm, the thickness of the third niobium-containing infrared reflection layer is 5nm-15nm, and the thickness of the fourth composite dielectric layer is 50nm-70nm.

5. The low-transmittance and low-reflection coated glass according to claim 1, characterized in that: The niobium material of the niobium-containing infrared reflection layer is single substance niobium or a niobium alloy containing niobium of not less than 85wt%.

6. The low-transmittance and low-reflection coated glass according to claim 1, characterized in that: The composite dielectric layer is one of silicon nitride, silicon oxynitride, niobium oxide, zirconium silicon nitride, tin oxide, zinc oxide or zirconium silicon oxide and nitride; Alternatively, the composite dielectric layer is formed by a composite of at least two of silicon nitride, silicon oxide, silicon oxynitride, niobium oxide, zirconium silicon nitride, tin oxide, zinc oxide or zirconium silicon oxide and nitride.

7. The low-transmittance and low-reflection coated glass according to claim 1, characterized in that: The coated glass further includes a protective layer, which is disposed on the outer side of the composite medium layer located at the outermost layer, and the thickness of the protective layer is less than or equal to 3 nm.

8. The low-transmittance and low-reflection coated glass according to claim 7, characterized in that: The protective layer is at least one of zirconium oxide, silicon carbide and DLC.

9. The low-transmittance and low-reflection coated glass according to claim 1, characterized in that: The glass substrate includes clear glass.

10. The low-transmittance and low-reflection coated glass according to claim 1, characterized in that: The coated glass comprises multiple layers of the glass substrate, the multiple layers of the glass substrate are prepared into a laminated glass, and the composite medium layer and the niobium-containing infrared reflection layer are located on the outer side of the laminated glass.

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