DE102017212771A1 - Glazing pane for a motor vehicle - Google Patents

Glazing pane for a motor vehicle

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Publication number
DE102017212771A1
DE102017212771A1 DE102017212771.6A DE102017212771A DE102017212771A1 DE 102017212771 A1 DE102017212771 A1 DE 102017212771A1 DE 102017212771 A DE102017212771 A DE 102017212771A DE 102017212771 A1 DE102017212771 A1 DE 102017212771A1
Authority
DE
Germany
Prior art keywords
layer
nm thick
silicon
coating
zirconia
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE102017212771.6A
Other languages
German (de)
Inventor
Wilma Dewald
Heike Walter
Stephan Ulrich
Stefan Bruns
Sebastian Jung
Michael Vergöhl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Volkswagen AG
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV, Volkswagen AG filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority to DE102017212771.6A priority Critical patent/DE102017212771A1/en
Publication of DE102017212771A1 publication Critical patent/DE102017212771A1/en
Application status is Pending legal-status Critical

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Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/3411Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials
    • C03C17/3429Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials at least one of the coatings being a non-oxide coating
    • C03C17/3435Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials at least one of the coatings being a non-oxide coating comprising a nitride, oxynitride, boronitride or carbonitride
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00Coatings on glass
    • C03C2217/70Properties of coatings
    • C03C2217/73Anti-reflective coatings with specific characteristics
    • C03C2217/734Anti-reflective coatings with specific characteristics comprising an alternation of high and low refractive indexes

Abstract

The invention relates to a glazing panel for a motor vehicle, comprising a glass pane having on at least one side a coating for infrared reflection, wherein the coating is formed of a plurality of layers of dielectric materials. It is envisaged that the materials of the layers are chosen such that the layers alternately have a high refractive index and a low refractive index such that the reflection color of the glazing panel is at least substantially independent of the viewing angle (a) equal to or nearly equal to the glazing panel ,

Description

  • The invention relates to a glazing panel for a motor vehicle, comprising a glass pane having on at least one side a coating for infrared reflection, wherein the coating is formed of a plurality of layers of dielectric materials.
  • Glazing panes of the type mentioned above are known from the prior art. To protect against excessive heat radiation of the sun in the vehicle interior through the glazing of a motor vehicle, measures are known that improve the climate comfort of the passengers. It is known, for example, to tint the windows in the rear region of the motor vehicle or to form the windshield as a climate comfortable windshield having an infrared-reflecting layer in the form of a laminated glass pane. Such a laminated glass pane is for example from the published patent application DE 69920278 T2 known. In this case, conductive silver layers are used as infrared reflection layers. From the publication WO 2009/032032 A1 Furthermore, a glazing panel is known, which has a bluish design of a multilayer silver-based coating that avoids a red color impression at an oblique angle to the glazing panel. From the publication DE 10 2008 028 141 A1 In addition, an abrasion-resistant coating is known, but attenuates electromagnetic radiation due to their electrically conductive layers and therefore may affect, for example, the mobile reception in the vehicle interior.
  • The invention is therefore an object of the invention to provide a glazing, which ensures an advantageous infrared reflection and at the same time light in the visible range and long-wave electromagnetic radiation, for example, the mobile, essentially pass, in addition to the visual impression of the glazing for a consideration in particular to be upgraded on the outside, for example, to avoid color shifts in a change in viewing angle.
  • The object underlying the invention is achieved by a glazing with the features of claim 1. By simple means this achieves the advantage that warming infrared rays are well reflected, visible light rays are well transmitted and color shifts of the reflection color when viewed from the outside are at least substantially independent of the viewing direction or viewing angle. In this case, a viewing angle is understood to be the angle between the viewing direction and the surface of the glazing pane. In addition to a lack of attenuation of long-wave electromagnetic radiation, a viewing angle-independent color impression of the glazing pane is thus ensured. According to the invention this is achieved in that the materials of the layers are selected such that the layers alternately have a high refractive index and a low refractive index such that the reflection color of the glazing panel is at least substantially equal to or nearly equal to the viewing angle on the glazing panel.
  • Titanium dioxide, zirconium dioxide, niobium (V) oxide, silicon nitride and / or Si x Al y N z or silicon aluminum nitride are preferably present in the coating as materials having a high refractive index. By means of these materials, a high refractive index can be realized in an advantageous manner in the coating in the respective layer.
  • Furthermore, it is preferably provided that, as materials with a low refractive index, silicon dioxide (SiO 2 ) or Si x Al y O z or silicon aluminum oxide are present in the coating. These materials are advantageously useful for the low refractive index layers in the coating. By the alternately high and low refractive index, a favorable interference in the coating is achieved. Optionally, one or more intermediate refractive index layers are added to the coating to optimize the result.
  • According to a preferred embodiment, the glass pane is a green glass pane. Alternatively or in addition to forming a laminated glass pane, the glass pane is preferably a white glass pane. The green glass panel already has a tint, which advantageously reduces the heat of the vehicle interior. For example, it is also conceivable to provide the inside of a glass pane of white glass or green glass or the combination of coated white glass with green glass or white glass as laminated safety glass. The advantage of the latter solution is that the abrasion resistance on the outside is ensured even without additional measures and the aspects of the angle-independent reflection color and the lack of attenuation of electromagnetic signals are maintained.
  • According to a preferred embodiment of the invention it is provided that the coating on the green glass pane alternately layers of silicon nitride and silicon dioxide, which may also comprise portions of aluminum. As a result, a favorable infrared reflection behavior of the coating or the glazing pane is ensured in a simple manner, as well as a viewing angle-independent color reflection course.
  • Preferably, the coating has a total of 10 to 24 layers. In particular, the reflection behavior of the IR radiation is increased with the number of layers.
  • Furthermore, it is preferably provided that the coating on the green glass pane alternately has layers of silicon dioxide and zirconium dioxide. This also ensures an advantageous infrared ray reflection. In this case, the coating preferably has 20 layers of the alternating materials. This ensures the advantageous reflection behavior. Instead of silicon dioxide, silicon aluminum oxide can also be used.
  • It is particularly preferred that, regardless of the number of layers and the type of materials and the glass, an additional layer of silicon nitride or silicon aluminum nitride between the coating and the glass sheet is thinner than the coating. The silicon nitride or silicon aluminum nitride layer serves as a diffusion barrier against alkali ions, which avoids chipping of the coating from the glass sheet by glass corrosion in an advantageous manner.
  • Preferably, the inner layers of the coating are up to 800 nm thick, resulting in an advantageous behavior of the coating.
  • Preferably, the additional layer is 15 to 155 nm, in particular 20 or 50 nm thick. In most cases, therefore, the additional layer is the thinnest of all applied to the glass sheets layers. Since it serves essentially only as a diffusion barrier, this layer thickness is sufficient. The advantageous reflection behavior is achieved by the overlying coating.
  • Furthermore, it is preferably provided that the outermost layer of the coating is a scratch-resistant protective layer. This prevents abrasion of the coating even when the coating is arranged on the outside of the glazing panel and is mechanically stressed by a windshield wiper. To improve the abrasion resistance or wear of the glazing pane 1 For example, a particularly thick additional layer of silicon dioxide, siliconaluminum oxide or a protective layer such as SICON® is used. An abrasion-resistant layer stack of the coating can additionally or alternatively also be obtained by heating the layers during or after the coating. Due to the advantageous choice of hard oxides within the layer stack, such as zirconia, the abrasion resistance can also be increased.
  • According to a preferred embodiment, it is provided that the coating on the green glass pane is formed as follows: a first layer 1 is formed by the additional layer of silicon aluminum nitride, which is 20 nm thick. On the additional layer, the coating is initially with one layer 2 made of silicon-aluminum oxide, which is 210 nm thick. This is followed by a situation 3 made of silicon aluminum nitride, which is 133 nm thick. This is followed by a situation 4 made of silicon-aluminum oxide which is 156 nm thick. This is followed by a situation 5 Silicon aluminum nitride, which is 106 nm thick. This is followed by a situation 6 Silicon alumina, which is 160 nm thick. This is followed by a situation 7 Silicon aluminum nitride, which is 110 nm thick. This is followed by a situation 8th Silicon alumina, which is 163 nm thick. This is followed by a situation 9 Silicon aluminum nitride, which is 113 nm thick. This is followed by a situation 10 Silica-alumina, which is 165 nm thick. This is followed by a situation 11 Silicon aluminum nitride, which is 124 nm thick. In this case, the layer thicknesses are optionally designed such that the reflection color is green in a wide angular range and the desired infrared reflection behavior is ensured.
  • According to a second embodiment, the coating on the green glass pane is constructed as follows: First, as a diffusion barrier, a silicon aluminum nitride layer as a layer 1 provided, which is 50 nm thick. This is followed by a layer of zirconia as a layer 2 which is 71 nm thick. It follows as a location 3 a silicon-aluminum oxide layer that is 205 nm thick. It follows as a location 4 a zirconia layer that is 31 nm thick. It follows as a location 5 a silicon-aluminum oxide layer which is 190 nm thick. It follows as a location 6 a zirconia layer that is 111 nm thick. It follows as a location 7 a silicon-aluminum oxide layer that is 137 nm thick. This is followed by a zirconia layer as a layer 8th which is 116 nm thick. It follows as a location 9 a silicon-aluminum oxide layer that is 100 nm thick. It follows as a location 10 a zirconia layer that is 99 nm thick. It follows as a location 11 a silicon-aluminum oxide layer, the 143 nm thick. It follows as a location 12 a zirconia layer that is 118 nm thick. It follows as a location 13 a silicon-aluminum oxide layer 204 nm thick. It follows as a location 14 a zirconia layer that is 29 nm thick. This is followed by a silicon-aluminum oxide layer as a layer 15 which is 203 nm thick. It follows as a location 16 a zirconia layer that is 122 nm thick. It follows as a location 17 a silicon-aluminum oxide layer that is 133 nm thick. It follows as a location 18 a zirconia layer that is 108 nm thick. It follows as a location 19 a silicon-aluminum oxide layer that is 191 nm thick. It follows as a location 20 a zirconia layer that is 126 nm thick. This is followed by a silicon-aluminum oxide layer as a layer 21 which is 82 nm thick. As before, the advantageous reflection behavior and the viewing angle-independent reflection color are ensured by the alternating layers with high and low refractive index.
  • Other features and advantages will be apparent from the foregoing and from the claims. In the following, the invention will be explained in more detail with reference to the drawing. Show this
    • 1 a glazing panel for a motor vehicle in a simplified sectional view,
    • 2A and 2 B a light behavior of the glazing pane according to a first embodiment,
    • 3A and 3B a light behavior of the glazing pane according to a second embodiment,
    • 4A and 4B a light behavior of the glazing panel according to a third embodiment,
    • 5A and 5B a light behavior of the glazing panel according to a fourth embodiment,
    • 6A and 6B a light behavior of the glazing panel according to a fifth embodiment and
    • 7A and 7B a light behavior of the glazing panel according to a sixth embodiment.
  • 1 shows in a simplified sectional view of a glazing pane 1 for a motor vehicle not shown in detail here. The glazing pane 1 is designed for example as a side window and has a glass pane as the main component 2 on, which is made of white glass or green glass, in particular of a single-pane safety glass. The glass pane 2 has two side surfaces, depending on the arrangement of the glass 2 serve on the motor vehicle as the outside or inside. Present is a first side surface, which in 1 facing up, as outside 3 and a second side surface as the inside 4 selected.
  • On the outside 3 shows the glass pane 2 a coating 5 on, in particular for infrared reflection (IR reflector), that is, for the reflection of light waves in the infrared range, is used. The coating prevents thermal radiation of the sun from entering the vehicle interior from the outside. For this purpose, the coating has multiple layers of dielectric materials, which in 1 are shown enlarged as a strip. The materials of the layers are chosen such that the layers alternately have a high refractive index and a low refractive index, wherein the thickness d and the material of the individual layers is selected such that a reflection color of the glazing pane 1 at least substantially independent of a viewing direction on the glazing pane 1 is the same or almost the same.
  • To a chipping off of the coating 5 by glass corrosion is to be avoided between the coating 5 and the glass pane 2 in this case an additional layer 6 formed, which acts as a diffusion barrier against alkali ions. At the shift 6 it is one compared to the other layers of the coating 5 thin layer of silicon nitride or silicon aluminum nitride.
  • In the following, based on embodiments different embodiments of the glazing 1 be explained in more detail.
  • Embodiment 1
  • The glazing pane 1 of the first embodiment has as a glass pane 2 a green glass pane as layer 0, which has a thickness d of 3.15 mm. The table below shows the remaining structure of the coating 5 as well as the additional layer 3 where the additional layer is a layer 1 and the subsequent layers of the coating the layers 2 to 11 form: Table 1 location Thickness d [nm] material 0 3.15 mm green glass 1 20.0 Siliziumaluminiumnitrid 2 210 silica-alumina 3 133 Siliziumaluminiumnitrid 4 156 silica-alumina 5 106 Siliziumaluminiumnitrid 6 160 Silicon alumina 2 7 110 Siliziumaluminiumnitrid 8th 163 silica-alumina 9 113 Siliziumaluminiumnitrid 10 165 silica-alumina 11 124 Siliziumaluminiumnitrid
  • In the first embodiment, silicon aluminum oxide is used as the low refractive index material and silicon aluminum nitride is used as the high refractive index material. The layer thicknesses d are designed so that the reflection color of the glazing pane 1 when viewed from the outside, that is on the outside 3 , is equal to or nearly equal to (green) in a wide angular range of at least 75 °. The on the glass 2 Applied layers are thermally treated, including the scratch resistance of the coating 5 increase, so that it is less susceptible to wear, for example, when a sealing lip is passed over the outermost layer / layer. The overall coating of the glass pane 2 consisting of the coating 5 and the additional layer 6 in this case has a total thickness of D = 1439 nm.
  • 2A and 2 B show the light behavior of the glazing panel 1 according to the first embodiment. 2A shows the achieved transmission T, reflection R and absorption A through the glazing panel 1 over the wavelength λ. For ease of understanding, the relevant spectral range is divided into a UV range, a visible light range VIS, and a near infrared range NIR. In the in 2A The spectrum shown can be found a reflection maximum of 90% at a wavelength λ = 900 nm. The reflection R rises steeply in the NIR region outside the visible spectrum VIS, which goes up to a wavelength of λ = 780 nm. In this area lies the majority of the heat radiation emitted by the sun. Due to the proposed design of the glazing pane 1 Thus, a high reflection of the emitted heat radiation is ensured.
  • The small angle dependence of the reflection color of the glazing pane 1 is compared to an uncoated green glass in 2 B shown. This shows transmission and reflection colors in a * and b * of the Lab color system. Thus, in the 2 B the values for both an uncoated glass pane (o) and for a glass pane with the coating (B) described above are drawn. It turns out that by the advantageous coating 5 or the IR reflector formed thereby, the reflection color behavior of the glazing pane 1 not or hardly changed. The a * value deviates by 5 with the coating, but also remains constant over the entire angular range or almost constant. This means that the color impression of the glazing panel 1 According to the first embodiment, the reflection and the viewing angles α from 0 ° to 75 ° appear to be the same. In this case, the viewing angle α is measured starting from a perpendicular to the outside 3 the glazing pane 1 , as in 1 shown. The result is thus the desired viewing angle-independent reflection color of the glazing pane 1 ,
  • Embodiment 2:
  • 3A and 3B show the light behavior of the glazing panel 1 in an embodiment of the coating according to a second embodiment. The second embodiment is shown in the following Table 2, wherein again, as the dielectric materials, silicon aluminum nitride and silicon aluminum oxide are alternately used. In contrast to the previous exemplary embodiment, there are now 19 alternating layers of the coating 5 intended. In addition, a final one is Scratch-resistant topcoat, in this case modified DLC containing silicon and oxygen, such as SICON®, which provides the scratch resistance of the coating 5 improved: Table 2 location Thickness d [nm] material 0 3.15 mm green glass 1 135 Siliziumaluminiumnitrid 2 71 silica-alumina 3 1 Siliziumaluminiumnitrid 4 82 silica-alumina 5 59 Siliziumaluminiumnitrid 6 55 silica-alumina 7 27 Siliziumaluminiumnitrid 8th 87 silica-alumina 9 143 Siliziumaluminiumnitrid 10 44 silica-alumina 11 159 Siliziumaluminiumnitrid 12 60 silica-alumina 13 140 Siliziumaluminiumnitrid 14 109 silica-alumina 15 23 Siliziumaluminiumnitrid 16 15 silica-alumina 17 78 Siliziumaluminiumnitrid 18 122 silica-alumina 19 20 Siliziumaluminiumnitrid 20 22 silica-alumina 21 84 Siliziumaluminiumnitrid 22 82 modified DLC, with silicon and oxygen
  • 3A and 3B show those from the 2A and 2 B already known diagrams, but with adjusted values. Noticeable is a maximum of the reflection R in the near-infrared range. It also shows that the color impression or the reflection color of the glazing panel 1 not or almost not changed depending on the angle α.
  • Embodiment 3
  • According to a third embodiment, a abrasion-tolerant design is selected in which abrasion of the uppermost layer does not change the color impression or the color reflection. A mechanical abrasion is therefore tolerated, but this is not visible visually by a change in color. A suitable overall coating is in the following Table 3 shows: Table 3 location Thickness d [nm] material 0 3.15 mm green glass 1 50 Siliziumaluminiumnitrid 2 74 zirconia 3 54 silica-alumina 4 157 zirconia 5 36 silica-alumina 6 44 zirconia 7 33 silica-alumina 8th 43 zirconia 9 225 silica-alumina 10 26 zirconia 11 52 silica-alumina 12 18 zirconia 13 71 silica-alumina 14 300 silica-alumina
  • Here are used as dielectric materials silicon nitride and zirconia, wherein the total coating 14 Has layers, the layers 13 and 14 both are made of silicon-aluminum oxide, and wherein the outermost layer 14 more than three times as thick as the location 13 ,
  • 4A and 4B show off again 2A and 2 B shown diagrams, with adjusted values. Here are the reflection R , Transmission T and absorption A for several wear conditions of the outermost layer 14 shown where the outermost layer 14 100%, 95%, 90%, 85% or 80% of their original thickness d.
  • embodiment 4 :
  • According to a fourth embodiment is as outermost layer 24 the coating 5 provided a 2 to 5 microns thick silicon oxide layer, which has a high wear resistance for the glazing pane 1 offers. As alternate dielectric materials, silicon aluminum nitride and silicon aluminum oxide are again selected here, the overall coating 24 Layers has: Table 4 location Thickness d [nm] material 0 3.15 mm green glass 1 155 Siliziumaluminiumnitrid 2 51 silica-alumina 3 12 Siliziumaluminiumnitrid 4 140 silica-alumina 5 6 Siliziumaluminiumnitrid 6 62 silica-alumina 7 162 Siliziumaluminiumnitrid 8th 21 silica-alumina 9 42 Siliziumaluminiumnitrid 10 11 silica-alumina 11 70 Siliziumaluminiumnitrid 12 173 silica-alumina 13 144 Siliziumaluminiumnitrid 14 117 silica-alumina 15 11 Siliziumaluminiumnitrid 16 41 silica-alumina 17 64 Siliziumaluminiumnitrid 18 67 silica-alumina 19 9 Siliziumaluminiumnitrid 20 91 silica-alumina 21 126 Siliziumaluminiumnitrid 22 15 silica-alumina 23 13 Siliziumaluminiumnitrid 24 2000 silica
  • 5B and 5B show the resulting light behavior. It shows 5B Alternatively, the course of transmission and reflection color at a layer thickness of the end position 24 of d = 5 μm, which also leads to an advantageous result. Again, there is an advantageous reflection in the infrared range as well as a nearly view angle independent reflection color. It is clear that the silicon oxide layer (layer 24 ), in particular silicon dioxide layer, even with abrasion no color change in the reflection color permits and thus represents a robust system.
  • Embodiment 5:
  • While the present embodiments each have an outer coating of the glass sheet 2 are concerned, is provided according to the following fifth embodiment that the glass 2 having an inner coating. The inside of the glass 2 is usually less mechanically loaded than the outside. However, green glass partially absorbs the sunlight, making the infrared reflector less effective on the inside. However, this can be compensated by a greater layer thickness of 2.6 μm of the total coating. The following Table 4 shows an advantageous structure of the overall coating of the glazing panel 1 , where as the alternating dielectric materials silicon aluminum nitride and zirconia are used. In total, 21 layers of the overall coating are provided here: Table 5 location Thickness d [nm] material 0 3.15 mm green glass 1 50 Siliziumaluminiumnitrid 2 71 zirconia 3 205 silica-alumina 4 31 zirconia 5 190 silica-alumina 6 111 zirconia 7 137 silica-alumina 8th 116 zirconia 9 100 silica-alumina 10 99 zirconia 11 143 silica-alumina 12 118 zirconia 13 204 silica-alumina 14 29 zirconia 15 203 silica-alumina 16 122 zirconia 17 133 silica-alumina 18 108 zirconia 19 191 silica-alumina 20 126 zirconia 21 82 silica-alumina
  • 6A shows the light behavior of the glazing panel 1 in terms of transmission, reflection and absorption over the wavelength λ, wherein the reflection R in the infrared range is significantly lower than in the previous embodiments. 6B shows the transmission and reflection color behavior of the embodiment 5 , wherein it can also be seen here that the reflection color is at least essentially independent of viewing angle.
  • Embodiment 6:
  • According to a sixth embodiment, it is provided that instead of green glass white glass is used as layer 0, which as such hardly absorbs light. With white glass, the absorption is so low that it does not matter. For an internal coating (iB) on white glass, ie on the inside of the glass pane 1 applied overall coating lends itself to the structure shown in Table 6: Table 6 location Thickness d [nm] material 0 3.15 mm white glass 1 40 Siliziumaluminiumnitrid 2 108 zirconia 3 119 silica-alumina 4 139 zirconia 5 187 silica-alumina 6 32 zirconia 7 195 silica-alumina 8th 672 zirconia 9 6 silica-alumina 10 144 zirconia 11 301 silica-alumina 12 102 zirconia 13 157 silica-alumina 14 420 zirconia
  • In this case, zirconium dioxide and silicon aluminum oxide are used as alternating dielectric materials, with silicon aluminum nitride also being used here as an additional layer to the diffusion barrier.
  • 7A and 7B show the light behavior of the sixth embodiment, with the resulting from the white glass low absorption A (see 7A) , Out 7B However, it is readily apparent that also here the reflection color through the coating (iB) on the inside 4 behaves essentially independently of angle.
  • Embodiment 7:
  • According to a seventh embodiment, not shown here, the glass pane 2 designed as a laminated glass pane. According to a first exemplary embodiment, the laminated glass pane has a structure in the following order: green glass coating 5 - PVB (polyvinyl butyral, especially foil) - green glass. Alternatively, the laminated glass has the layers in the following order: white glass coating 5 - PVB - green glass. In particular, in a glazing panel comprising a laminated glass, white glass is selected / used as the outboard glass so that the coating 5 or the IR reflector can be made as thin as possible.
  • The essential characteristics of the embodiments described above are summarized again in the following Table 7: embodiment T e [%] according to ISO 9050: 2003 (E) TTS [%] number of layers Total layer thickness [nm] Skin Damage Factor Green glass, 3.15 mm, reference 48.0 60.8 - - 5.5 Embodiment 1 silicon aluminum nitride / silicon aluminum oxide 40.5 49.9 11 1439 3 Embodiment 2 Silicon aluminum nitride / silicon aluminum oxide + modified DLC 39.3 49.5 22 1628 1.0 Exemplary Embodiment 3 Optically Robust, Abrasion Tolerant Design Zirconia / silica-alumina with 300 nm silica-alumina overlay 42.1 53.0 14 1182 1.5 Exemplary embodiment 4 silicon aluminum nitride / silicon aluminum oxide + 2 μm silicon oxide 40.3 50.7 24 3606 1.7 Embodiment 5 Optimized inner coating on green glass silicon aluminum oxide / zirconium dioxide on the inside 36.1 50.9 21 2600 1.9 Embodiment 6 Coating on White Glass Silicon Alumina / Zirconia 55.3 56.4 14 2622 26.6
  • Wherein the Te value is the solar spectrum weighted transmission and the TTS value the total transmitted solar energy, that is including the heat convection.
  • Due to the advantageous coating 5 , which forms the IR reflector, an interference-based layer system is provided, which reflects the heat radiation of the sun, which is located in the wavelength range of 780 nm to 2500 nm, to a large extent, while transmission in the visible spectral range remains at a high level. The proposed embodiments also allow a nearly color-independent viewing angle with low electromagnetic attenuation in the long-wave range of mobile radio waves. The materials used in the coating are chosen so that they are inert under weather conditions, scatter the light and are also abrasion resistant.
  • Due to the advantageous embodiment of the glazing pane 1 is achieved that at least at a viewing angle of up to 75 ° from the perpendicular to the surface of the glazing panel 1 the color impression remains neutral or the color reflection does not change or changes only slightly.
  • The outer coating achieves the highest performance in terms of reflection and infrared radiation from the sun. The present embodiments use, in part, silicon-aluminum oxide or silicon-aluminum nitride. Optionally, these materials can also be used without aluminum components. The materials silicon aluminum oxide and silicon aluminum nitride are preferred since they are inexpensive and amorphous materials which can be homogeneously applied to the pane at high coating rates and have no phase transformation when tempered. In particular, the deposition of silicon aluminum oxide and silicon aluminum nitride was carried out in the exemplary embodiments by means of reactive center frequency sputtering. Oxygen was used as the reactive gas for the deposition of silicon-aluminum oxide and nitrogen for silicon-aluminum-nitride. The sputtering target used was preferably a Si: Al (90:10 wt%) target.
  • The coating 5 can be achieved in the embodiments mentioned in particular by the following two variants:
    • Variant 1: First, a flat substrate is coated and then reshaped. Here, the layer stack must withstand a temperature of 650 ° C for 10 min. Similarly, the layer thicknesses must join the bend without local thickness variation. The materials must have no phase change up to 650 ° C, thus excretes, for example, titanium dioxide as high-index material. This method is most economical for a mass production process and therefore preferred.
    • Variant 2: coating of the already bent substrate. The layers are not exposed to high temperatures, so that the substrate can be used as chemically tempered glass. The bent glass must be coated homogeneously, which is realized by suitable diaphragms, for example in the sputtering process.
  • LIST OF REFERENCE NUMBERS
  • 1
    glazing panel
    2
    pane
    3
    outside
    4
    inside
    5
    coating
    6
    layer
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 69920278 T2 [0002]
    • WO 2009/032032 A1 [0002]
    • DE 102008028141 A1 [0002]

Claims (13)

  1. Glazing pane (1) for a motor vehicle, comprising a glass pane (2) having on at least one side a coating (5) for infrared reflection, wherein the coating (5) is formed of a plurality of layers of dielectric materials, characterized in that the materials the layers are selected such that the layers alternately have a high refractive index and a low refractive index such that the reflection color of the glazing panel (1) is at least substantially independent of a viewing angle (a) equal to or nearly equal to the glazing panel (1).
  2. Glazing pane after Claim 1 characterized in that titanium dioxide, zirconia, hafnia, niobium (V) oxide, silicon nitride and / or silicon aluminum nitride are present in the coating (5) as high refractive index materials.
  3. Glazing pane according to one of the preceding claims, characterized in that as materials with a low refractive index silicon dioxide or silicon aluminum oxide are present in the coating (5).
  4. Glazing pane according to one of the preceding claims, characterized in that the glass pane (2) is a green glass pane or a white glass pane.
  5. Glazing pane according to one of the preceding claims, characterized in that the coating (5) alternately has layers of silicon aluminum nitride and silicon aluminum oxide.
  6. Glazing pane according to one of the preceding claims, characterized in that the coating (5) has a total of 10 to 24 layers.
  7. Glazing pane according to one of the preceding claims, characterized in that the coating (5) comprises alternating layers of silicon-aluminum oxide and zirconium dioxide.
  8. Glazing pane according to one of the preceding claims, characterized in that an additional layer (6) of silicon nitride lies between the coating (5) and the glass pane (2), wherein the additional layer (6) is thinner than the layers of the coating (5 ).
  9. Glazing pane according to one of the preceding claims, characterized in that the inner layers of the coating are up to 800 nm thick.
  10. Glazing pane according to one of the preceding claims, characterized in that the additional layer is 15 to 150 nm, in particular 20 or 50 nm thick.
  11. Glazing pane according to one of the preceding claims, characterized in that the outermost layer of the coating (5) is a scratch-resistant protective layer.
  12. Glazing pane according to one of the preceding claims, characterized in that the coating (5) on the green glass pane is constructed as follows: - Layer 1: silicon aluminum nitride, 20 nm thick; Layer 2: silicon alumina, 210 nm thick; Layer 3: silicon aluminum nitride, 133 nm thick; Layer 4: silicon alumina, 156 nm thick; Layer 5: silicon aluminum nitride, 106 nm thick; Layer 6: silicon alumina, 160 nm thick; Layer 7: silicon aluminum nitride, 110 nm thick; Layer 8: silicon alumina, 163 nm thick; Layer 9: silicon aluminum nitride, 113 nm thick; Layer 10: silicon alumina, 165 nm thick; Layer 11: silicon aluminum nitride, 124 nm thick.
  13. Glazing pane according to one of the preceding claims, characterized in that the coating (5) on the green glass pane is constructed as follows: - Layer 1: silicon aluminum nitride layer, 50 nm thick; Layer 2: zirconia layer, 71 nm thick; - Layer 3: silicon aluminum oxide layer, 205 nm thick; Layer 4: zirconia layer, 31 nm thick; Layer 5: silicon aluminum oxide layer, 190 nm thick; Layer 6: zirconia layer, 111 nm thick; Layer 7: silicon aluminum oxide layer, 137 nm thick; Layer 8: zirconia layer, 116 nm thick; Layer 9: silicon alumina layer, 100 nm thick; Layer 10: zirconia layer, 99 nm thick; Layer 11: silicon alumina layer, 143 nm thick; Layer 12: zirconia layer, 118 nm thick; Layer 13: silicon alumina layer, 204 nm thick; Layer 14: zirconia layer, 29 nm thick; Layer 15: silicon aluminum oxide layer, 203 nm thick; Layer 16: zirconia layer, 122 nm thick; Layer 17: silicon aluminum oxide layer, 133 nm thick; Layer 18: zirconia layer, 108 nm thick; Layer 19: silicon alumina layer, 191 nm thick; Layer 20: zirconia layer, 126 nm thick; Layer 21: silicon aluminum oxide layer, 82 nm thick.
DE102017212771.6A 2017-07-25 2017-07-25 Glazing pane for a motor vehicle Pending DE102017212771A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4024308A1 (en) * 1989-07-31 1991-02-07 Central Glass Co Ltd Waermeisolierglas with dielectric vielschichtenueberzug
GB2324098A (en) * 1997-04-08 1998-10-14 Pilkington Plc Solar control coated glass
DE69920278T2 (en) 1998-12-18 2005-11-17 Glaverbel Glazed window
WO2009032032A1 (en) 2007-09-07 2009-03-12 Guardian Industries Corp. Coated article with low-e coating having absorbing layer designed for desirable bluish color at off-axis viewing angles
DE102008028141A1 (en) 2008-06-13 2009-12-17 Audi Ag Glass product
EP1923365B1 (en) * 2005-08-16 2011-10-19 Asahi Glass Company, Limited Laminated glass for vehicle window
DE102011087967A1 (en) * 2011-12-08 2013-06-13 Von Ardenne Anlagentechnik Gmbh Color-stable, IR-reflective and transparent layer system and method for its production, glass unit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4024308A1 (en) * 1989-07-31 1991-02-07 Central Glass Co Ltd Waermeisolierglas with dielectric vielschichtenueberzug
GB2324098A (en) * 1997-04-08 1998-10-14 Pilkington Plc Solar control coated glass
DE69920278T2 (en) 1998-12-18 2005-11-17 Glaverbel Glazed window
EP1923365B1 (en) * 2005-08-16 2011-10-19 Asahi Glass Company, Limited Laminated glass for vehicle window
WO2009032032A1 (en) 2007-09-07 2009-03-12 Guardian Industries Corp. Coated article with low-e coating having absorbing layer designed for desirable bluish color at off-axis viewing angles
DE102008028141A1 (en) 2008-06-13 2009-12-17 Audi Ag Glass product
DE102011087967A1 (en) * 2011-12-08 2013-06-13 Von Ardenne Anlagentechnik Gmbh Color-stable, IR-reflective and transparent layer system and method for its production, glass unit

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