Decorative material, preparation method thereof and electronic equipment

Abstract

The invention provides a decorative material, a preparation method thereof and electronic equipment. The decorative material comprises a base body; the transition layer is arranged on one side of the base body; the color layer is arranged on the side, away from the base body, of the transition layer; the connecting layer is arranged on the side, away from the transition layer, of the color layer; the coating layer is arranged on the side, away from the color layer, of the connecting layer; the coating layer comprises a plurality of sub-coating layers which are sequentially stacked, the sub-coating layer, close to the connecting layer, in the plurality of sub-coating layers is a first sub-coating layer, the thermal expansion coefficient of the first sub-coating layer is 3 * 10 <-6 > / K-6 * 10 <-6 > / K, the thermal expansion coefficient of the connecting layer is 5 * 10 <-6 > / K-10 * 10 <-6 > / K, and the thermal expansion coefficient of the first sub-coating layer is smaller than that of the connecting layer. Therefore, the decorative material can achieve the colorful effect, meanwhile, the binding force between the layers of the decorative material can be guaranteed, and the problem that the film layer falls off in the using process is solved.

Description

[0001] This invention patent application is a divisional application of the Chinese invention patent application with application date of June 23, 2020, application number 202010579396.5, and name “Decorative materials, preparation methods thereof, and electronic equipment”. Technical Field

[0002] The present invention relates to the field of materials, and in particular to a decorative material, a preparation method thereof, and electronic equipment. Background Art

[0003] With the advancement of science and technology, people have higher and higher requirements for the appearance and decorative effects of materials. The appearance and decorative effects of a single color can no longer meet the needs of users, and the appearance and decorative effects of materials are developing towards diversification.

[0004] Existing technology can deposit a color layer on the surface of a substrate through physical vapor deposition (PVD), but it cannot achieve a dazzling effect (different colors when viewed in different directions); while forming a coating on the surface of the substrate through non-conductive electroplating technology (NCVM) can achieve a glare effect, the bonding force between the coating and the substrate is weak, and part of the coating is easily peeled off from the substrate surface during use. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the above-mentioned related art to a certain extent. To this end, the present invention provides a decorative material with a dazzling effect and good interlayer bonding strength.

[0006] In a first aspect, the present invention provides a decorative material, comprising: a substrate; a transition layer, the transition layer being arranged on one side of the substrate; a color layer, the color layer being arranged on a side of the transition layer away from the substrate; a connecting layer, the connecting layer being arranged on a side of the color layer away from the transition layer; and a coating layer, the coating layer being arranged on a side of the connecting layer away from the color layer; the coating layer comprising a plurality of sub-coating layers stacked in sequence, wherein the sub-coating layer close to the connecting layer among the plurality of sub-coating layers is a first sub-coating layer, and the thermal expansion coefficient of the first sub-coating layer is 3×10 -6 / K-6×10 -6 / K, the thermal expansion coefficient of the connecting layer is 5×10 -6 / K-10×10 -6 / K, and the thermal expansion coefficient of the first sub-plating layer is smaller than the thermal expansion coefficient of the connecting layer.

[0007] According to the decorative material provided by the present invention, the stacked multi-layer sub-coating layer can cause light interference. When the angle of the incident light is different, the interference effect of the coating layer on the light is different, thereby presenting different visual effects. On the one hand, the color layer can reflect part of the incident light to provide a color rendering effect. On the other hand, the color layer itself has color, making the visual effect of the decorative material more obvious. The present invention can achieve a dazzling effect by superimposing the coating layer and the color layer. In addition, the present invention provides a transition layer between the color layer and the substrate to improve the bonding strength between the color layer and the substrate. A thermal expansion coefficient of 5×10 -6 / K-10×10 -6 / K range of the connecting layer, and control the thermal expansion coefficient of the first sub-coating layer to be 3×10 -6 / K-6×10 -6 / K range, and the thermal expansion coefficient of the first sub-coating layer is smaller than that of the connecting layer, which can improve the bonding strength between the coating layer and the color layer. As a result, the decorative material can achieve a dazzling effect while also ensuring the bonding strength between the layers of the decorative material, avoiding the problem of the coating layer falling off during use.

[0008] In a second aspect, the present invention provides a method for preparing a decorative material, comprising providing a substrate; forming a transition layer on one side of the substrate; forming a color layer on a side of the transition layer away from the substrate; forming a connecting layer on a side of the color layer away from the transition layer; and forming a coating layer on a side of the connecting layer away from the color layer; wherein the coating layer comprises a plurality of sub-coating layers stacked in sequence, wherein the sub-coating layer closest to the connecting layer among the plurality of sub-coating layers is a first sub-coating layer, and the thermal expansion coefficient of the first sub-coating layer is 3×10 -6 / K-6×10 -6 / K, the thermal expansion coefficient of the connecting layer is 5×10 -6 / K-10×10 -6 / K, and the thermal expansion coefficient of the first sub-coating layer is less than the thermal expansion coefficient of the connecting layer. The method for preparing the decorative material provided by the present invention is simple and easy to implement, and can produce a decorative material with a dazzling effect and good interlayer bonding strength.

[0009] A third aspect of the present invention provides an electronic device comprising the aforementioned decorative material. Thus, at least a portion of the electronic device is formed by the aforementioned decorative material, and the electronic device has all the features and advantages of the aforementioned decorative material, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0011] Figure 1 is a schematic cross-sectional view of a decorative material according to an embodiment of the present invention;

[0012] Figure 2 is a schematic cross-sectional view of a decorative material according to another embodiment of the present invention;

[0013] Figure 3 is a schematic cross-sectional view of a decorative material according to another embodiment of the present invention;

[0014] Description of reference numerals:

[0015] 10. Substrate; 20. Transition layer; 210. First transition layer; 220. Second transition layer; 30. Color layer; 40. Connecting layer; 50. Coating layer; 510. Sub-coating layer; 60. Anti-fingerprint layer. DETAILED DESCRIPTION

[0016] The 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 are not to be construed as limiting the present invention.

[0017] like Figure 1-Figure 2 As shown, the first aspect of the present invention provides a decorative material, comprising: a substrate 10, a transition layer 20, a color layer 30, a connecting layer 40, and a coating layer 50, wherein the transition layer 20 is arranged on one side of the substrate 10, and the color layer 30 is arranged on the side of the transition layer 20 away from the substrate 10; the connecting layer 40 is arranged on the side of the color layer 30 away from the transition layer 20; the coating layer 50 is arranged on the side of the connecting layer 40 away from the color layer 30, and the coating layer 50 includes a plurality of sub-coating layers 510 stacked in sequence, wherein the sub-coating layer close to the connecting layer in the multi-layer sub-coating layer 510 is the first sub-coating layer, and the thermal expansion coefficient of the first sub-coating layer is 3×10 -6 / K-6×10 -6 / K, the thermal expansion coefficient of the connecting layer 40 is 5×10 -6 / K-10×10 -6 / K, and the thermal expansion coefficient of the first sub-coating layer is less than that of the connecting layer. Therefore, the present invention can make light interfere by stacking the multi-layer sub-coating layer 510. When the angle of the incident light is different, the coating layer 50 refracts and reflects the incident light. The incident light can present a glare effect at different angles after being refracted and reflected by the multi-layer sub-coating layer 510. On the one hand, the color layer can reflect part of the incident light to provide a color rendering effect. On the other hand, the color layer itself has color, making the visual effect of the decorative material more obvious. The superposition of the coating layer and the color layer can achieve a dazzling effect. Moreover, the present invention can improve the bonding strength between the color layer 30 and the substrate 10 by setting a transition layer 20 between the color layer 30 and the substrate 10. A transition layer with a thermal expansion coefficient of 5×10 -6 / K-10×10 -6 / K range of the connecting layer 40, and control the thermal expansion coefficient of the first sub-coating layer to be 3×10 -6 / K-6×10 -6 / K range, and the thermal expansion coefficient of the first sub-coating layer is smaller than that of the connecting layer 40, which can improve the bonding strength between the coating layer 50 and the color layer 30. As a result, the decorative material can achieve a dazzling effect while also ensuring the bonding strength between the layers of the decorative material, avoiding the problem of the coating layer falling off during use.

[0018] It should be noted that, the phrase “the thermal expansion coefficient of the first sub-coating layer is smaller than the thermal expansion coefficient of the connecting layer” in the present invention means that the changing trend of the thermal expansion coefficients of the first sub-coating layer and the connecting layer is gradually decreasing, and does not exclude the possibility that the thermal expansion coefficients of the first sub-coating layer and the connecting layer are similar due to technical limitations or errors.

[0019] In one embodiment of the present invention, the substrate 10 can be a thin plate made of metal material, and its thickness can be selected according to actual needs without special restrictions. The substrate 10 is the main body of the decorative material, and its material is preferably aluminum alloy and / or magnesium alloy.

[0020] In one embodiment of the present invention, the transition layer 20 includes a first transition layer 210 and a second transition layer 220 stacked in sequence. The second transition layer 220 is disposed on the side of the first transition layer 210 away from the substrate 10. The thickness of the transition layer 20 is 100 nm to 1000 nm, the thickness of the first transition layer 210 can be 30 nm to 50 nm, and the thickness of the second transition layer can be 50 nm to 900 nm. The thickness of the first transition layer is smaller than that of the second transition layer, thereby ensuring the adhesion of the color layer and improving the wear resistance of the decorative material.

[0021] Furthermore, the first transition layer 210 is a metal layer. Specifically, the first transition layer 210 may include at least one of a Ti layer, a Cr layer and a W layer. The thermal expansion coefficient of the first transition layer 210 made of metal material is close to the thermal expansion coefficient of the metal substrate 10. Thus, the internal stress between the transition layer 20 and the substrate 10 can be reduced, thereby increasing the bonding force between the transition layer 20 and the substrate 10.

[0022] Furthermore, the second transition layer 220 is a metal silicide layer. Specifically, the second transition layer 220 may include at least one of a TiSi layer, a CrSi layer, and a WSi layer. This metal silicide second transition layer can enhance the bonding strength between the color layer 30 and the first transition layer 210, preventing the color layer 30 from falling off, and improving the wear resistance of the decorative material.

[0023] In one embodiment of the present invention, the color layer 30 is a metal carbon silicide layer and / or a metal nitride silicide layer. Specifically, the color layer 30 may include at least one of a TiSiC layer, a CrSiC layer, a WSiC layer, a TiSiN layer, a CrSiN layer, and a WSiN layer. This color layer 30 serves as the base layer of the decorative material, giving it a rich appearance. It also serves as a shielding layer for the coating layer, reflecting some of the light incident on the color layer and generating interference in the coating layer. The thickness of the color layer may range from 1 μm to 3 μm.

[0024] In one embodiment of the present invention, the variation trend of the thermal expansion coefficients of the first transition layer 210, the second transition layer 220 and the color layer 30 is gradually reduced, thereby providing a buffer from the substrate to the color layer, avoiding the film bursting phenomenon caused by the large difference in thermal expansion coefficients between the substrate and the color layer.

[0025] In one embodiment of the present invention, the first transition layer 210 is made of metal, the second transition layer 220 is made of metal silicide, and the color layer 30 is made of metal carbon silicide and / or metal nitrogen silicide. Preferably, the metals in the first transition layer 210, the second transition layer 220 and the color layer 30 are made of homogeneous metals. As a result, the bonding strength between the layers of the decorative material will be better. It is speculated that the reason may be that the metal silicide of the second transition layer can be combined with the metal of the first transition layer through the same metal substance, and the metal silicide of the second transition layer can be combined with the metal carbon silicide and / or metal nitrogen silicide of the color layer through the same metal substance and silicon, thereby making the bonding strength between the layers better and not easy to fall off.

[0026] In one embodiment of the present invention, the connecting layer 40 and the first sub-coating layer comprise the same material. Based on the principle that like dissolves like, using the connecting layer 40 and the first sub-coating layer comprised of the same material provides good bonding strength. The thickness of the connecting layer 40 can range from 20 nm to 300 nm.

[0027] Preferably, the material of the connecting layer 40 includes silicon dioxide (SiO 2 ), and the material of the first sub-coating layer also includes silicon dioxide (SiO 2 ), thereby further improving the bonding strength between the color layer 30 and the coating layer 50 .

[0028] In one embodiment of the present invention, the thermal expansion coefficients of the transition layer 20, the color layer 30, and the connecting layer 40 show a gradually decreasing trend; thus, the difference in thermal expansion coefficients between the layers is small, thereby avoiding the film bursting phenomenon caused by the large difference in thermal expansion coefficients between the substrate 10 and the coating layer 50.

[0029] In one embodiment of the present invention, the total thickness of the transition layer 20, the color layer 30, and the connection layer 40 is 1 μm to 4 μm, thereby achieving close integration between the layers while improving efficiency and saving costs.

[0030] In one embodiment of the present invention, the thickness of the coating layer 50 is 20nm-1000nm, thereby being able to better show the appearance effect of the decorative material. The coating layer 50 includes a multilayer sub-coating layer 510 stacked in sequence, and the multilayer sub-coating layer 510 includes a high refractive index sub-coating layer and a low refractive index sub-coating layer, and the high refractive index sub-coating layer and the low refractive index sub-coating layer are alternately arranged; the alternating high refractive index sub-coating layer and the low refractive index sub-coating layer strengthen or weaken the effect of light through the interference of light, thereby presenting a glare effect at different angles. It is understandable that the coating layer has a certain light transmittance, so that the incident light can pass through the coating layer to produce interference. In addition, the number of film layers of the multilayer sub-coating layer 510 is not particularly limited, for example: it can be 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, 7 layers... and so on.

[0031] Furthermore, the refractive index of the high-refractive-index sub-coating layer is ≥2.0, and the refractive index of the low-refractive-index sub-coating layer is <2.0. Specifically, the material of the high-refractive-index sub-coating layer may include at least one of titanium oxide (TiO2), titanium dioxide (Ti2O3), titanium pentoxide (Ti3O5), tantalum pentoxide (Ta2O5), zirconium oxide (ZrO2), niobium oxide (Nb2O5), and cerium oxide (CeO2), and the material of the low-refractive-index sub-coating layer may include at least one of aluminum oxide (Al2O3), silicon dioxide (SiO2), and magnesium oxide (MgO).

[0032] In one embodiment of the present invention, the transition layer 20, color layer 30, and connection layer 40 are all physical vapor deposition (PVD) coatings, while the coating layer 50 is a non-conductive electroplated layer. PVD coatings offer high controllability, enabling control of the density and thermal expansion coefficient of each layer, resulting in strong bonding between the layers. The coating layer, comprising multiple sub-layers, formed by non-conductive electroplating, exhibits a glaring effect. The combination of these two methods creates a decorative layer on the substrate that exhibits strong bonding and a dazzling optical effect.

[0033] In one embodiment of the present invention, the decorative material further includes a functional layer, which is arranged on a side of the first sub-coating layer away from the connecting layer, wherein the thickness of the functional layer is 10-50 nm. Furthermore, the material of the functional layer includes at least one of gold, silver, copper, aluminum, indium, tin, indium-tin alloy and silver-aluminum alloy. The provision of the functional layer can further enhance the metallic texture of the appearance of the decorative material.

[0034] like Figure 3 As shown, the decorative material may further include an anti-fingerprint layer 60, which is disposed on a side of the coating layer 50 away from the connecting layer 40. Thus, the anti-fingerprint layer 60 can protect the coating layer 50 and improve the wear resistance and anti-fingerprint effect of the decorative material.

[0035] A second aspect of the present invention provides a method for preparing a decorative material, comprising providing a substrate; forming a transition layer on one side of the substrate; forming a color layer on a side of the transition layer away from the substrate; forming a connecting layer on a side of the color layer away from the transition layer; and forming a coating layer on a side of the connecting layer away from the color layer; wherein the coating layer comprises a plurality of sub-coating layers stacked in sequence, wherein the sub-coating layer closest to the connecting layer among the plurality of sub-coating layers is a first sub-coating layer, and the thermal expansion coefficient of the first sub-coating layer is 3×10 -6 / K-6×10 -6 / K, the thermal expansion coefficient of the connecting layer is 5×10 -6 / K-10×10 -6 / K, and the thermal expansion coefficient of the first sub-coating layer is smaller than that of the connecting layer. The method for preparing the decorative material provided by the present invention is simple and easy to implement, and can prepare a decorative material with a colorful effect and good interlayer bonding strength.

[0036] In one embodiment of the present invention, the transition layer, color layer, and connecting layer are formed by physical vapor deposition (PVD). The film layers formed by PVD are highly controllable, enabling control of the density and thermal expansion coefficient of each layer, thereby ensuring good adhesion between the layers. The coating layer is formed by non-conductive electroplating, which comprises multiple sub-layers and exhibits a glaring effect. The combination of these two methods creates a decorative layer on a substrate that exhibits good adhesion and a dazzling optical effect.

[0037] In one embodiment of the present invention, the step of forming the transition layer by physical vapor deposition includes: forming a first transition layer by physical vapor deposition and forming a second transition layer by physical vapor deposition.

[0038] In one embodiment of the present invention, the conditions for forming the first transition layer by physical vapor deposition are: current 10A-40A, voltage 250-150V, and during the deposition process, the power supply current gradually increases and the power supply voltage gradually decreases; the conditions for forming the second transition layer by physical vapor deposition are: current 15A-35A, voltage 150-10V, and during the deposition process, the power supply current gradually increases and the power supply voltage gradually decreases; the conditions for forming the color layer by physical vapor deposition are: current 5A-35A, voltage 150-10V, and during the deposition process, the power supply current gradually increases and the power supply voltage gradually decreases; the conditions for forming the connecting layer by physical vapor deposition are: current 5-35A, voltage 50-150V; the conditions for forming the coating layer by non-conductive electroplating are: ion-assisted voltage 100V-500V. The present invention controls the changes in current and voltage during the physical vapor deposition process, controls the speed of the material splashed out of the target material, and indirectly controls the magnitude of the force of the target material hitting the surface of the substrate, thereby controlling the density and thermal expansion coefficient of the deposited film layer, ensuring the effect of the deposited film layer, improving the adhesion of the film layer, and further improving the bonding strength between the film layers; and in the step of forming the coating layer by non-conductive electroplating, the thermal expansion coefficient of the coating layer can be controlled by adjusting the voltage of the ion auxiliary accessories of the equipment, so that the thermal expansion coefficient of the coating layer is close to that of the connecting layer, and the coating layer and the connecting layer have good bonding strength.

[0039] One embodiment of the present invention may further include forming an anti-fingerprint layer on the side of the coating layer away from the connecting layer. Specifically, the anti-fingerprint layer can be formed on the product surface by evaporation coating, spray coating, or dip coating. This protects the coating layer and improves the wear resistance and anti-fingerprint effect of the product.

[0040] A third aspect of the present invention provides an electronic device comprising the aforementioned decorative material. Thus, at least a portion of the electronic device is formed by the aforementioned decorative material, and the electronic device has all the features and advantages of the aforementioned decorative material, which will not be described in detail here.

[0041] Example 1

[0042] The decorative material comprises: an aluminum alloy substrate, a Ti metal transition layer (30 nm thick), a TiSi transition layer (600 nm thick), a TiSiC color layer (1 μm thick), a SiO2 connecting layer (30 nm thick), a SiO2 first sub-coating layer (10 nm thick), a Ti3O5 coating layer (20 nm thick), a SiO2 coating layer (20 nm thick), a Ti3O5 coating layer (40 nm thick), a SiO2 coating layer (30 nm thick), a Ti3O5 film layer (20 nm thick), and an anti-fingerprint layer, which are stacked in sequence. The thermal expansion coefficient of the SiO2 connecting layer is 6×10 -6 / K, the thermal expansion coefficient of the first SiO2 sub-coating layer is 5×10 -6 / K;

[0043] Preparation process of decorative materials:

[0044] (1) providing an aluminum alloy substrate;

[0045] (2) forming a Ti metal transition layer with a thickness of 30 nm on the surface of the aluminum alloy substrate by physical vapor deposition. During the deposition process, the power supply current gradually increased and the power supply voltage gradually decreased. The current range was between 10A and 40A, and the voltage range was between 250V and 150V.

[0046] (3) forming a TiSi transition layer with a thickness of 600 nm on the side of the Ti metal transition layer away from the aluminum alloy substrate by physical vapor deposition. During the deposition process, the power supply current gradually increased and the power supply voltage gradually decreased. The current range was between 15A and 35A, and the voltage range was between 150V and 10V.

[0047] (4) forming a TiSiC color layer with a thickness of 1 μm on the side of the TiSi transition layer away from the Ti metal first transition layer by physical vapor deposition. During the deposition process, the power supply current gradually increases and the power supply voltage gradually decreases. The current range is between 5A and 35A, and the voltage range is between 150V and 10V.

[0048] (5) A 30 nm thick SiO2 connection layer was formed on the side of the TiSiC color layer away from the TiSi transition layer by physical vapor deposition. During the deposition process, the current was 20 A and the voltage range was 100 V. The thermal expansion coefficient of the formed SiO2 connection layer was 6×10 -6 / K;

[0049] (6) On the side of the SiO2 connecting layer away from the TiSiC color layer, a coating layer comprising a SiO2 first sub-coating layer with a thickness of 10 nm, a Ti3O5 coating layer with a thickness of 20 nm, a SiO2 coating layer with a thickness of 20 nm, a Ti3O5 coating layer with a thickness of 40 nm, a SiO2 coating layer with a thickness of 30 nm, and a Ti3O5 coating layer with a thickness of 20 nm is formed in sequence by non-conductive electroplating. The ion auxiliary voltage in the process of forming the coating layer by non-conductive electroplating is 300 V, and the thermal expansion coefficient of the SiO2 first sub-coating layer is 5×10 -6 / K;

[0050] (7) An anti-fingerprint layer is formed on a side of the coating layer away from the connecting layer to obtain a decorative material.

[0051] Example 2

[0052] The decorative material structure and preparation process of this embodiment are basically the same as those of Example 1, except that the Ti metal transition layer is replaced by a Cr metal transition layer, the TiSi transition layer is replaced by a CrSi transition layer, and the TiSiC color layer is replaced by a CrSiN color layer.

[0053] Example 3

[0054] The structure and preparation process of the decorative material of this embodiment are basically the same as those of Example 1. The difference is that during the deposition of the SiO2 connecting layer, the current is 30A, the voltage range is 70V, and the thermal expansion coefficient of the formed SiO2 connecting layer is 8×10 -6 / K, the ion-assisted voltage in the process of forming the coating layer by non-conductive electroplating is 400V, and the thermal expansion coefficient of the first sub-SiO2 coating layer is 4×10 -6 / K.

[0055] Example 4

[0056] The structure and preparation process of the decorative material of this embodiment are basically the same as those of Example 1, except that the thickness of the Ti metal transition layer is 50 nm, the thickness of the TiSi transition layer is 500 nm, and the thickness of the TiSiC color layer is 1.1 μm.

[0057] Example 5

[0058] The decorative material structure and preparation process of this embodiment are basically the same as those of Example 1, except that it also includes an indium metal functional layer (with a thickness of 20 nm). The indium metal functional layer is formed between the Ti3O5 coating layer and the SiO2 coating layer, and the functional layer is formed by non-conductive electroplating.

[0059] Comparative Example 1

[0060] The structure and preparation process of the decorative material of this comparative example are basically the same as those of Example 1, except that it does not contain a SiO2 connecting layer.

[0061] Comparative Example 2

[0062] The decorative material structure and preparation process of this comparative example are basically the same as those of Example 1, except that it does not contain SiO2 connecting layer, SiO2 first sub-coating layer, Ti3O5 coating layer, SiO2 coating layer, Ti3O5 coating layer, SiO2 coating layer, and Ti3O5 coating layer.

[0063] Comparative Example 3

[0064] The structure and preparation process of the decorative material of this comparative example are basically the same as those of Example 1, except that it does not contain a Ti metal transition layer, a TiSi transition layer, a TiSiC color layer, and a SiO2 connecting layer.

[0065] Performance Testing

[0066] 1. 100-grid adhesion test:

[0067] a. Use a grid knife (blade angle is 15°~30°) to cut the surface of the test sample ≥10mm 2 Draw 10×10 1mm×1mm grids on the surface of the sample, and each line should be deep enough to reach the bottom layer of the sample;

[0068] b. Use a brush to clean the debris in the test area;

[0069] c. Use adhesive tape with an adhesion of 350g / cm2 to 400g / cm2 (3M No. 600 adhesive tape or equivalent) to firmly adhere to the small network being tested, and use an eraser to rub the tape vigorously to increase the contact area and strength between the tape and the tested area;

[0070] d. Grab one end of the tape and quickly tear it off at 90 degrees. Perform the same test twice at the same location to observe the coating shedding and grade it as follows:

[0071] 5B: The mesh has no peeling;

[0072] 4B: The area of ​​the peeled portion is no more than 5% of the area of ​​the tape in contact with the surface;

[0073] 3B: The area of ​​the peeled portion is greater than 5% of the area of ​​the tape in contact with the surface, but not more than 15%;

[0074] 2B: The area of ​​the peeled portion is greater than 15% of the area of ​​the tape in contact with the surface, but not more than 35%;

[0075] 1B: The area of ​​the peeled portion is greater than 35% of the area of ​​the tape in contact with the surface, but not more than 65%;

[0076] 0B: The area of ​​the peeled portion is greater than 65% of the area of ​​the tape in contact with the surface;

[0077] 2. Appearance effect:

[0078] a. Place the test sample at a position perpendicular to the light of the human eye and observe the product color.

[0079] b. Rotate the test sample until the human eye's light angle is 60 degrees and then observe the color.

[0080] c. Rotate the test sample until the human eye's light angle is 150 degrees and then observe the color.

[0081] When the colors observed at the three angles are all different, it is determined to have a dazzling appearance effect;

[0082] When the colors observed at three angles are the same, it is determined that there is no dazzling appearance effect.

[0083] Test results: The performance of the decorative materials of Examples 1-5 and Comparative Examples 1-3 were tested respectively. The test results are shown in Table 1:

[0084] Table 1

[0085] Binding strength Appearance Example 1 5B With colorful appearance effect Example 2 5B With colorful appearance effect Example 3 5B With colorful appearance effect Example 4 5B With colorful appearance effect Example 5 5B With colorful appearance effect Comparative Example 1 2B With colorful appearance effect Comparative Example 2 5B No colorful appearance effect Comparative Example 3 2B With colorful appearance effect

[0086] As can be seen from Table 1, compared with traditional decorative materials (i.e., comparative examples 1-3), the decorative materials of the present invention (i.e., embodiments 1-5) can achieve a dazzling effect, while also ensuring the bonding strength between the layers of the decorative material, thereby avoiding the problem of coating shedding during use.

[0087] In the description of this specification, the description with reference to the term "implementation method" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment 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 can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory. In addition, it should be noted that in this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0088] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A decorative material, characterized in that: include: matrix; A transition layer, the transition layer being arranged on one side of the substrate; A color layer, the color layer is arranged on a side of the transition layer away from the substrate; A connecting layer, the connecting layer being arranged on a side of the color layer away from the transition layer; A coating layer, wherein the coating layer is arranged on a side of the connecting layer away from the color layer; The coating layer includes multiple sub-coating layers stacked in sequence, wherein the sub-coating layer close to the connecting layer in the multiple sub-coating layers is the first sub-coating layer, and the thermal expansion coefficient of the first sub-coating layer is 3×10 -6 / K-6×10 -6 / K, the thermal expansion coefficient of the connecting layer is 5×10 -6 / K-10×10 -6 / K, and the thermal expansion coefficient of the first sub-plating layer is less than the thermal expansion coefficient of the connecting layer; Among them, the connecting layer is a physical vapor deposition coating, and the thermal expansion coefficient of the connecting layer is determined based on physical vapor deposition; the coating layer is a non-conductive electroplating coating, and the thermal expansion coefficient of the coating layer is determined based on ion-assisted voltage coating.

2. The decorative material according to claim 1, characterized in that: The transition layer and the color layer are both physical vapor deposition coatings.

3. The decorative material according to claim 1, characterized in that: The material of the connecting layer includes silicon dioxide, and the material of the first sub-coating layer includes silicon dioxide.

4. The decorative material according to claim 1, characterized in that: The multiple layers of sub-coating layers include high-refractive-index sub-coating layers and low-refractive-index sub-coating layers, and the high-refractive-index sub-coating layers and the low-refractive-index sub-coating layers are alternately arranged; Preferably, the refractive index of the high-refractive-index sub-coating layer is ≥2.0; and the refractive index of the low-refractive-index sub-coating layer is <2.

0.

5. The decorative material according to claim 1, characterized in that: The thermal expansion coefficients of the transition layer, the color layer and the connection layer show a gradually decreasing trend; Preferably, the total thickness of the transition layer, the color layer and the connection layer is 1 μm-4 μm; Preferably, the thickness of the transition layer is 100nm-1000nm, the thickness of the color layer is 1μm-3μm, and the thickness of the connection layer is 20nm-300nm.

6. The decorative material according to claim 1, characterized in that: The transition layer comprises a first transition layer and a second transition layer which are stacked in sequence, wherein the second transition layer is arranged on a side of the first transition layer away from the substrate; Preferably, the thickness of the first transition layer is 30nm-50nm, and the thickness of the second transition layer is 50nm-900nm; Preferably, the expansion coefficients of the first transition layer, the second transition layer and the color layer show a gradually decreasing trend; Preferably, the first transition layer is a metal layer, the second transition layer is a metal silicide layer, and the color layer is a metal carbon silicide layer and / or a metal nitride silicide layer; Further preferably, the first transition layer includes at least one of a Ti layer, a Cr layer and a W layer, the second transition layer includes at least one of a TiSi layer, a CrSi layer and a WSi layer, and the color layer includes at least one of a TiSiC layer, a CrSiC layer, a WSiC layer, a TiSiN layer, a CrSiN layer and a WSiN layer.

7. The decorative material according to claim 1, characterized in that: The coating layer further comprises a functional layer, and the functional layer is arranged on a side of the first sub-coating layer away from the connecting layer; Preferably, the thickness of the functional layer is 10-50 nm; Preferably, the functional layer includes at least one of a gold layer, a silver layer, a copper layer, an aluminum layer, an indium layer, a tin layer, an indium-tin alloy layer and a silver-aluminum alloy layer.

8. The decorative material according to claim 1, characterized in that: The decorative material further comprises an anti-fingerprint layer, and the anti-fingerprint layer is arranged on a side of the coating layer away from the connecting layer.

9. The decorative material according to claim 1, characterized in that: The material of the substrate includes aluminum alloy and / or magnesium alloy.

10. A method for preparing a decorative material, characterized in that: providing a substrate; forming a transition layer on one side of the substrate; forming a color layer on a side of the transition layer away from the substrate; forming a connecting layer on a side of the color layer away from the transition layer; forming a coating layer on a side of the connection layer away from the color layer; The coating layer includes multiple sub-coating layers stacked in sequence, and the sub-coating layer close to the connecting layer in the multiple sub-coating layers is the first sub-coating layer, and the thermal expansion coefficient of the first sub-coating layer is 3×10 -6 / K-6×10 -6 / K, the thermal expansion coefficient of the connecting layer is 5×10 -6 / K-10×10 -6 / K, and the thermal expansion coefficient of the first sub-plating layer is less than the thermal expansion coefficient of the connecting layer; Among them, the connecting layer is formed by physical vapor deposition, and the thermal expansion coefficient of the connecting layer is determined based on the physical vapor deposition method; the coating layer is formed by ion-assisted voltage coating, and the thermal expansion coefficient of the coating layer is determined based on the ion-assisted voltage coating method.

11. The preparation method according to claim 10, characterized in that: The transition layer and the color layer are formed by physical vapor deposition.

12. The preparation method according to claim 11, characterized in that: The step of forming the transition layer by physical vapor deposition comprises: forming a first transition layer by physical vapor deposition and forming a second transition layer by physical vapor deposition, wherein: The conditions for forming the first transition layer by physical vapor deposition are: current 10A-40A, voltage 250-150V, during the deposition process, the power supply current gradually increases and the power supply voltage gradually decreases; The conditions for forming the second transition layer by physical vapor deposition are: current 15A-35A, voltage 150-10V, during the deposition process, the power supply current gradually increases and the power supply voltage gradually decreases; The conditions for forming the color layer by physical vapor deposition are: the current is 5A-35A, the voltage is 150-10V, and during the deposition process, the power supply current gradually increases and the power supply voltage gradually decreases; The conditions for forming the connection layer by physical vapor deposition are: current 5-35A, voltage 50-150V; The conditions for forming the coating layer by non-conductive electroplating are: ion auxiliary voltage 100V-500V.

13. The preparation method according to claim 10, characterized in that: The method also includes forming an anti-fingerprint layer on a side of the coating layer away from the connecting layer.

14. An electronic device, characterized in that: The electronic device comprises the decorative material according to claims 1-9.

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