Composite element and mobile device

Abstract

Composite element (11, 12, 21, 31, 41), comprising: a composite structure (110, 120, 210, 310, 410) with a substrate (111, 411) and a composite layer (112, 312, 412), wherein the composite layer (112, 312, 412) is arranged on a surface of the substrate (111, 411); wherein a material of the substrate (111, 411) is an aluminum alloy and the composite layer (112, 312, 412) comprises an alloy layer (113); wherein the alloy layer (113) comprises at least three metals, wherein the at least three metals comprise zirconium, copper and aluminium; wherein the composite element (11, 12, 21, 31, 41) has a curved zone (101), a total length of the composite layer (112, 312, 412) in the curved zone (101) is LCc, a length of the curved zone (101) is Lc, a thickness of the alloy layer (113) is Ta, a thickness of the substrate (111, 411) is Ts and the following conditions are met: 0.75 ≤ LCc / Lc ; and 0.50 ≤ Ta / Ts ≤ 1.00.

Description

BACKGROUND Technical area

[0001] The present disclosure relates to a composite element and a mobile device. In particular, the present disclosure relates to a composite element with excellent overall lifetime and a mobile device incorporating the composite element. Description of the state of the art

[0002] Mobile devices are prone to scratches due to frequent transport, which can lead to visible damage to their surface. To prevent damage, users typically use a protective case. However, these cases often have drawbacks, such as being too heavy or not hard enough.

[0003] In order to meet users' requirements regarding the protection of mobile devices, it is therefore necessary to actively develop a structure that is both thin and highly hard. SUMMARY

[0004] According to one aspect of the present disclosure, a composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. One material of the substrate is an aluminum alloy, and the composite layer comprises an alloy layer. The alloy layer comprises at least three metals, wherein the at least three metals are zirconium, copper, and aluminum. The composite element has a curved zone. If the total length of the composite layer in the curved zone is LCc, the length of the curved zone is Lc, the thickness of the alloy layer is Ta, and the thickness of the substrate is Ts, then the following conditions are satisfied: 0.75 ≤ LCc / Lc; and 0.50 ≤ Ta / Ts ≤ 1.00.

[0005] According to the composite element of the foregoing aspect, wherein, if a weight percentage of zirconium in the alloy layer is Pzr, a weight percentage of copper in the alloy layer is Pcu, and a weight percentage of aluminum in the alloy layer is Pal, the following conditions are met: 60% ≤ Pzr ≤ 90%; 5% ≤ Pcu ≤ 23%; and 2% ≤ Pal ≤ 6%.

[0006] According to the composite element of the above aspect, where, if the density of the alloy layer is Da and the density of the substrate is Ds, the following condition is satisfied: 1.5 ≤ Da / Ds ≤ 3.5.

[0007] According to the composite element of the above aspect, wherein, if the thermal conductivity coefficient of the alloy layer is TCa and the thermal conductivity coefficient of the substrate is TCs, the following condition is satisfied: 30 ≤ TCs / TCa.

[0008] According to the composite element of the above aspect, wherein, if the hardness of the alloy layer is Ha, the following condition is met: 400 HV ≤ Ha ≤ 1000 HV.

[0009] According to the composite element of the above aspect, wherein, if the hardness of the alloy layer is Ha and the hardness of the substrate is Hs, the following condition is met: 5.00 ≤ Ha / Hs ≤ 10.00.

[0010] According to the composite element of the above aspect, wherein, if the thickness of the alloy layer is Ta, the following condition is met: 0.5 mm ≤ Ta ≤ 1.5 mm.

[0011] According to the composite element of the foregoing aspect, wherein the composite structure further comprises a buffer layer located between the composite layer and the substrate.

[0012] According to the composite element of the foregoing aspect, wherein the composite element is a central frame and the composite element has a long edge region and a short edge region.

[0013] According to the composite element of the above aspect, wherein, if the total length of the composite layer in the curve zone is LCc and the length of the curve zone is Lc, the following condition is satisfied: 0.85 ≤ LCc / Lc.

[0014] According to the composite element of the above aspect, wherein, if a total length of the composite layer in the long edge region is LLc and a length of the long edge region is LI, the following condition is satisfied: 0 < LLc / LI ≤ 0.15.

[0015] According to the composite element of the above aspect, wherein, if a total length of the composite layer in the short edge region is LSc and a length of the short edge region is Ls, the following condition is satisfied: 0.05 ≤ LSc / Ls ≤ 0.15.

[0016] According to another aspect of the present disclosure, a mobile device comprises the composite element according to the aforementioned aspect, wherein the mobile device is a mobile phone or a tablet computer.

[0017] According to another aspect of the present disclosure, a composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer. The alloy layer comprises at least three metals, wherein the at least three metals are zirconium, copper, and aluminum. If a region of the composite layer in the composite element is Ac, a region of the substrate in the composite element is As, a thickness of the alloy layer is Ta, and a thickness of the substrate is Ts, the following conditions can be satisfied: 0.200 ≤ Ac / As; and 0.20 ≤ Ta / Ts ≤ 2.00.

[0018] According to the composite element of the foregoing aspect, wherein a weight percentage of zirconium in the alloy layer is Pzr, a weight percentage of copper in the alloy layer is Pcu, a weight percentage of aluminum in the alloy layer is Pal, and the following condition is met: 95% ≤ Pzr+Pcu+Pal.

[0019] According to the composite element of the above aspect, wherein, if the hardness of the alloy layer is Ha, the following condition is met: 300 HV ≤ Ha.

[0020] According to the composite element of the above aspect, wherein, if the hardness of the substrate is Hs, the following condition is met: Hs ≤ 250 HV.

[0021] According to the composite element of the above aspect, where, if the density of the alloy layer is Da and the density of the substrate is Ds, the following condition is satisfied: Da / Ds ≤ 5.0.

[0022] According to the composite element of the above aspect, wherein, if the thermal conductivity coefficient of the substrate is TCs, the following condition is met: 5 W / mK ≤ TCs.

[0023] According to the composite element of the above aspect, wherein, if the thermal conductivity coefficient of the alloy layer is TCa and the thermal conductivity coefficient of the substrate is TCs, the following condition is satisfied: 5 ≤ TCs / TCa.

[0024] According to the composite element of the aspect described above, wherein one material of the substrate is an aluminum alloy, a titanium alloy or a stainless steel.

[0025] According to the composite element of the above aspect, wherein, if the thickness of the alloy layer is Ta, the following condition is met: 0.3 mm < Ta.

[0026] According to the composite element of the foregoing aspect, wherein the composite element is a back panel or a front frame.

[0027] According to the composite element of the foregoing aspect, wherein, if the area of ​​the composite layer in the composite element is Ac and the area of ​​the substrate in the composite element is As, the following condition is satisfied: 0.350≤Ac / As≤0.450

[0028] According to yet another aspect of the present disclosure, a mobile device comprises the composite element as described in the aforementioned aspect.

[0029] According to the composite element of the foregoing aspect, wherein, if the composite element has a curved zone, a long edge region, and a short edge region, and the alloy layer is an amorphous alloy; wherein, if the hardness of the alloy layer is Ha, the hardness of the substrate is Hs, the thickness of the alloy layer is Ta, the thickness of the substrate is Ts, the total length of the composite layer in the curved zone is LCc, the length of the curved zone is Lc, the total length of the composite layer in the long edge region is LLc, the length of the long edge region is LI, the total length of the composite layer in the short edge region is LSc, and the length of the short edge region is Ls, the following conditions are satisfied: 6.00 ≤ Ha / Hs ≤ 8.00; 0.60 ≤ Ta / Ts ≤ 0.90; 0.90 ≤ LCc / Lc ≤ 1.00; 0.05 ≤ LLc / LI ≤ 0.10; and 0.10 ≤ LSc / Ls ≤ 0.13. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present disclosure may be more fully understood by reading the following detailed description of the embodiment with reference to the accompanying drawings: Fig. Figure 1 is a schematic view of the front of the mobile device according to Example 1 of the present disclosure. Fig. Figure 2 is a schematic view of the composite element of the mobile device. Fig. 1, viewed from the short edge area. Fig. Figure 3 is a schematic view of the back of the mobile device. Fig. 1. Fig. Figure 4 is a schematic view of the front of the mobile device according to Example 13 of the present disclosure. Fig. Figure 5 is a schematic view of the front of the mobile device according to Example 14 of the present disclosure. Fig. 6 is a side view of the mobile device from Fig. 5. Fig.Figure 7 is a schematic view of part of the composite element according to Example 15 of the present disclosure. DETAILED DESCRIPTION

[0031] According to a composite element and a mobile device of the present disclosure, the composite element comprises a composite structure, and a composite layer comprising an alloy layer is arranged on a surface of a substrate of the composite structure, such that ideal properties of the composite structure are achieved. By designing a specific thickness ratio between the alloy layer and the substrate, a composite layer with excellent hardness can be ensured in the composite structure, which has a beneficial effect on improving the overall service life of the composite structure.

[0032] According to one embodiment of an aspect of the present disclosure, a composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. One material of the substrate is an aluminum alloy, and the composite layer comprises an alloy layer. The alloy layer comprises at least three metals, wherein the at least three metals are zirconium, copper, and aluminum. The composite element has a curved zone, wherein, if the total length of the composite layer in the curved zone is LCc, the length of the curved zone is Lc, the thickness of the alloy layer is Ta, and the thickness of the substrate is Ts, the following conditions are satisfied: 0.75 ≤ LCc / Lc; and 0.50 ≤ Ta / Ts ≤ 1.00. Therefore, by arranging the composite layer comprising an alloy layer on the surface of the substrate, ideal properties of the composite structure are achieved.Furthermore, by designing the ratio of the composite layer in the curved zone, the scratch resistance of the collision-prone areas of the mobile device can be effectively improved, and the installation efficiency of the composite structure in the mobile device can be significantly enhanced. Additionally, by designing the specific thickness ratio between the alloy layer and the substrate, the composite layer can be made to exhibit excellent hardness, which has a positive impact on improving the overall service life of the composite structure.

[0033] According to a further embodiment of the present disclosure, a composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer. The alloy layer comprises at least three metals, and the at least three metals comprise zirconium, copper, and aluminum. If a region of the composite layer in the composite element is Ac, a region of the substrate in the composite element is As, a thickness of the alloy layer is Ta, and a thickness of the substrate is Ts, the following conditions are satisfied: 0.200 ≤ Ac / As; and 0.20 ≤ Ta / Ts ≤ 2.00. Therefore, by arranging the composite layer comprising an alloy layer on the surface of the substrate, ideal properties of the composite structure are achieved.Furthermore, by designing the optimal area ratio of the composite layer, the best scratch resistance is achieved with a smaller installation area of ​​the composite layer. This is advantageous for improving the installation efficiency of the composite layer across the entire area. Additionally, by designing the specific thickness ratio between the alloy layer and the substrate, the composite layer can be made to exhibit excellent hardness within the composite structure, which has a positive effect on improving the overall service life of the composite structure.

[0034] According to the composite element of the present disclosure, if the thickness of the alloy layer is Ta and the thickness of the substrate is Ts, the following condition can be met: 0.30 ≤ Ta / Ts ≤ 1.50. By designing the specific thickness ratio of the alloy layer and the substrate, the composite layer can be made to exhibit excellent hardness in the composite structure, which has a beneficial effect on improving the overall service life of the composite structure. Furthermore, the following condition can be met: 0.60 ≤ Ta / Ts ≤ 0.90. Additionally, the following condition can be met: 0.75 ≤ Ta / Ts ≤ 0.85.

[0035] According to the composite element of the present disclosure, if the total length of the composite layer in the curved zone is LCc and the length of the curved zone is Lc, the following condition can be met: 0.80 ≤ LCc / Lc. By designing the ratio of the composite layer in the curved zone, the scratch resistance of the collision-prone areas of the mobile device can be effectively improved, and the installation efficiency of the composite structure in the mobile device can be significantly improved. Furthermore, the following condition can be met: 0.85 ≤ LCc / Lc. Additionally, the following condition can be met: 0.90 ≤ LCc / Lc ≤ 1.00.

[0036] According to the composite element of the present disclosure, if the area of ​​the composite layer in the composite element is Ac and the area of ​​the substrate in the composite element is As, the following condition can be met: 0.350 ≤ Ac / As ≤ 0.450. By designing the optimal area ratio of the composite layer, the best scratch resistance can be achieved with a smaller installation area of ​​the composite layer. This is advantageous for improving the installation efficiency of the composite layer across the entire area. Furthermore, the following condition can be met: 0.005 ≤ Ac / As ≤ 0.060. Furthermore, the following condition can be met: 0.015 ≤ Ac / As ≤ 0.020. Furthermore, the following condition can be met: 0.600 ≤ Ac / As. Furthermore, the following condition can be met: 0.380 ≤ Ac / As ≤ 0.420.

[0037] According to the composite element of the present disclosure, if a weight percentage of zirconium in the alloy layer is Pzr, the following condition can be met: 60% ≤ Pzr ≤ 90%. By designing the specific ratio of zirconium in the alloy layer, the composite layer is produced with both hardness and ductility, thus preventing the composite layer from being too brittle and easily detaching. Furthermore, the following condition can be met: 50% ≤ Pzr. Furthermore, the following condition can be met: 55% ≤ Pzr < 100%. Furthermore, the following condition can be met: 62% ≤ Pzr ≤ 80%. Furthermore, the following condition can be met: 68% ≤ Pzr ≤ 75%.

[0038] According to the composite element of the present disclosure, if a weight percentage of copper in the alloy layer is Pcu, the following condition can be met: 5% ≤ Pcu ≤ 23%. By designing the specific ratio of copper in the alloy layer, the composite layer is produced with both hardness and ductility, thus preventing the composite layer from being too brittle and detaching easily. Furthermore, the following condition can be met: Pcu ≤ 30%. Furthermore, the following condition can be met: 0% < Pcu ≤ 25%. Furthermore, the following condition can be met: 10% ≤ Pcu ≤ 21%. Furthermore, the following condition can be met: 12% ≤ Pcu ≤ 20%. Furthermore, the following condition can be met: 15% ≤ Pcu ≤ 18%.

[0039] According to the composite element of the present disclosure, if a weight percentage of aluminum in the alloy layer is Pal, the following condition can be met: 2% ≤ Pal ≤ 6%. By designing the specific ratio of aluminum in the alloy layer, the composite layer is produced with both hardness and ductility, thus preventing the composite layer from being too brittle and easily detaching. Furthermore, the following condition can be met: Pal ≤ 10%. Furthermore, the following condition can be met: 0% < Pal ≤ 8%. Furthermore, the following condition can be met: 3% ≤ Pal ≤ 5%.

[0040] According to the composite element of the present disclosure, if the weight percentage of zirconium in the alloy layer is Pzr, the weight percentage of copper in the alloy layer is Pcu, and the weight percentage of aluminum in the alloy layer is Pal, the following condition can be met: 95% ≤ Pzr + Pcu + Pal. Fulfilling the overall ratio of zirconium, copper, and aluminum in the alloy layer ensures that the properties of zirconium, copper, and aluminum dominate in the alloy layer, which helps the alloy layer maintain adequate hardness and thermal conductivity. Furthermore, the following condition can be met: 75% ≤ Pzr + Pcu + Pal. Furthermore, the following condition can be met: 80% ≤ Pzr + Pcu + Pal. Furthermore, the following condition can be met: 83% ≤ Pzr + Pcu + Pal. Furthermore, the following condition can be met: 87% ≤ Pzr+Pcu+Pal.Furthermore, the following condition can be met: 90% ≤ Pzr+Pcu+Pal. Furthermore, the following condition can be met: 93% ≤ Pzr+Pcu+Pal ≤ 100%. Furthermore, the following condition can be met: 95% ≤ Pzr+Pcu+Pal ≤ 98%.

[0041] According to the composite element of the present disclosure, if the density of the alloy layer is Da and the density of the substrate is Ds, the following condition can be met: 1.5 ≤ Da / Ds ≤ 3.5. By designing the specific density ratio of the alloy layer and the substrate, the distribution of weight on both sides of the composite structure is ensured, which has a beneficial effect on improving the feel. Furthermore, the following condition can be met: Da / Ds ≤ 5.0. Furthermore, the following condition can be met: Da / Ds ≤ 4.0. Furthermore, the following condition can be met: 2.0 ≤ Da / Ds ≤ 3.0. Furthermore, the following condition can be met: 2.4 ≤ Da / Ds ≤ 2.5.

[0042] According to the composite element of the present disclosure, if the thermal conductivity coefficient of the alloy layer is TCa and the thermal conductivity coefficient of the substrate is TCs, the following condition can be met: 30 ≤ TCs / TCa. By designing the thermal conductivity ratio between the substrate and the alloy layer, it is ensured that the substrate has a better thermal conductivity than the composite layer, and the composite layer is prevented from creating a thermal barrier for the composite structure. Furthermore, the following condition can be met: 5 ≤ TCs / TCa. Furthermore, the following condition can be met: 10 ≤ TCs / TCa. Furthermore, the following condition can be met: 60 ≤ TCs / TCa. Furthermore, the following condition can be met: 70 ≤ TCs / TCa ≤ ∞. Furthermore, the following condition can be met: 75 ≤ TCs / TCa ≤ 90.

[0043] According to the composite element of the present disclosure, if the thermal conductivity coefficient of the substrate is TCs, the following condition can be met: 5 W / mK ≤ TCs. By adjusting the specific thermal conductivity coefficient of the substrate, the composite structure achieves excellent thermal conductivity. Furthermore, the following condition can be met: 20 W / mK ≤ TCs. Furthermore, the following condition can be met: 50 W / mK ≤ TCs. Furthermore, the following condition can be met: 80 W / mK ≤ TCs. Furthermore, the following condition can be met: 100 W / mK ≤ TCs. Furthermore, the following condition can be met: 130 W / mK ≤ TCs ≤ ∞. Furthermore, the following condition can be met: 180 W / mK ≤ TCs ≤ 300 W / mK.

[0044] According to the composite element of the present disclosure, if the thermal conductivity coefficient of the alloy layer is TCa, the following condition can be met: 0.5 W / mK ≤ TCa. By limiting the thermal conductivity coefficient of the alloy layer, a basic thermal conductivity is ensured, which has a beneficial effect on reducing the heat accumulation of the composite structure. Furthermore, the following condition can be met: 1.0 W / mK ≤ TCa. Furthermore, the following condition can be met: 1.5 W / mK ≤ TCa. Furthermore, the following condition can be met: 2.0 W / mK ≤ TCa ≤ ∞.

[0045] According to the composite element of the present disclosure, if the hardness of the alloy layer is Ha, the following condition can be met: 400 HV ≤ Ha ≤ 1000 HV. By adjusting the specific hardness of the alloy layer, the composite structure can be provided with excellent scratch and abrasion resistance. Furthermore, the following condition can be met: 300 HV ≤ Ha. Furthermore, the following condition can be met: 350 HV ≤ Ha. Furthermore, the following condition can be met: 450 HV ≤ Ha ≤ 600 HV. Furthermore, the following condition can be met: 500 HV≤Ha≤550 HV.

[0046] According to the composite element of the present disclosure, if the hardness of the substrate is Hs, the following condition can be met: Hs ≤ 250 HV. By using the substrate with a lower hardness, the substrate is easier to manufacture and process, which has a beneficial effect on reducing the difficulties in producing the composite structure. Furthermore, the following condition can be met: Hs ≤ 200 HV. Furthermore, the following condition can be met: 0 HV < Hs ≤ 180 HV. Furthermore, the following condition can be met: 50 HV ≤ Hs ≤ 150 HV. Furthermore, the following condition can be met: 80 HV ≤ Hs ≤ 100 HV.

[0047] According to the composite element of the present disclosure, if the hardness of the alloy layer is Ha and the hardness of the substrate is Hs, the following condition can be met: 5.00 ≤ Ha / Hs ≤ 10.00. By designing the specific hardness ratio of the alloy layer and the substrate, the composite layer exhibits better scratch and abrasion resistance than the substrate, which has a beneficial effect on improving the installation efficiency of the composite layer. Furthermore, the following condition can be met: 6.00 ≤ Ha / Hs ≤ 8.00. Furthermore, the following condition can be met: 1.50 ≤ Ha / Hs. Furthermore, the following condition can be met: 2.00 ≤ Ha / Hs. Furthermore, the following condition can be met: 2.50 ≤ Ha / Hs. Furthermore, the following condition can be met: 3.00 ≤ Ha / Hs. Furthermore, the following condition can be met: 7.00 ≤ Ha / Hs ≤ 7.50.

[0048] According to the composite element of the present disclosure, if the thickness of the alloy layer is Ta, the following condition can be met: 0.5 mm ≤ Ta ≤ 1.5 mm. By designing the specific thickness of the alloy layer and improving the physical properties of the composite structure with a smaller alloy layer thickness, material costs can be saved. Furthermore, the following condition can be met: 0.30 mm ≤ Ta. Furthermore, the following condition can be met: 0.10 mm ≤ Ta. Furthermore, the following condition can be met: Ta ≤ 1.00 mm. Furthermore, the following condition can be met: 0 mm < Ta ≤ 1.00 mm. Furthermore, the following condition can be met: 0.40 mm ≤ Ta. Furthermore, the following condition can be met: 0.60 mm ≤ Ta ≤ 1.20 mm. Furthermore, the following condition can be met: 0.70 mm ≤ Ta ≤ 0.80 mm.

[0049] According to the composite element of the present disclosure, the composite structure can further comprise a buffer layer, wherein the buffer layer is located between the composite layer and the substrate. By placing the buffer layer between the composite layer and the substrate, the substrate, with its lower hardness, can prevent damage from direct impact on the composite structure, thereby improving the durability of the substrate.

[0050] According to the composite element of the present disclosure, the composite element can be a central frame, and the composite element has a long edge region and a short edge region. The scratch resistance and abrasion resistance of the edges of the mobile device can be effectively improved by using the composite element as a central frame.

[0051] According to the composite element of the present disclosure, if the total length of the composite layer in the long edge region is LLc and the length of the long edge region is LI, the following condition can be satisfied: 0 < LLc / LI ≤ 0.15. By designing the ratio of the composite layer in the long edge region, the composite layer achieves excellent scratch resistance with a shorter arrangement length, which has a beneficial effect on improving the installation efficiency of the composite layer in the long edge region. Furthermore, the following condition can be satisfied: LLc / LI ≤ 0.25. Furthermore, the following condition can be satisfied: LLc / LI ≤ 0.20. Furthermore, the following condition can be satisfied: 0.05 ≤ LLc / LI ≤ 0.10.

[0052] According to the composite element of the present disclosure, if the total length of the composite layer in the short edge region is LSc and the length of the short edge region is Ls, the following condition can be satisfied: 0.05 ≤ LSc / Ls ≤ 0.15. By designing the ratio of the composite layer in the short edge region, the composite layer achieves excellent scratch resistance at a shorter arrangement length, which has a beneficial effect on improving the installation efficiency of the composite layer in the short edge region. Furthermore, the following condition can be satisfied: LSc / Ls ≤ 0.30. Furthermore, the following condition can be satisfied: LSc / Ls ≤ 0.25. Furthermore, the following condition can be satisfied: 0 < LSc / Ls ≤ 0.20. Furthermore, the following condition can be satisfied: 0.10 ≤ LSc / Ls ≤ 0.13.

[0053] According to the composite element of the present disclosure, the substrate material can be an aluminum alloy, a titanium alloy, or stainless steel. The substrate exhibits basic hardness and excellent thermal conductivity by being adapted to the aluminum alloy, titanium alloy, or stainless steel material.

[0054] According to the composite element of the present disclosure, the composite element can be a back panel or a front frame. The scratch resistance and abrasion resistance of the contact area of ​​the mobile device with the user can be improved by arranging the composite element as a back panel or as a front frame of the mobile device.

[0055] According to the composite element of the present disclosure, the alloy layer can be an amorphous alloy. The amorphous structure is not as brittle as the crystalline structure. This has a beneficial effect in preventing the alloy layer from tearing upon impact when the alloy layer is configured as an amorphous alloy.

[0056] The composite element of the present disclosure can be a frame, a back panel, a housing, a top cover, a bottom cover, a press, a knob, a gear, a carousel, or a rotating shaft. The frame can further be arranged on the middle frame or the front frame, etc. The composite element can have a curved zone and a side zone. The curved zone is the area that appears curved when viewed from above when the composite element is lying flat. The curvature is judged by the radius of curvature of the horizontal cross-section when the composite element is lying flat. The side zone is located between two of the curved zones when the composite element is lying flat. Its beginning and end are straight lines, and the entire straight line segment exceeds 50%, with the fold line being considered as several straight lines.The side zone is subdivided into the long edge zone and the short edge zone according to the position of the side length within the side zone. The side zone located on the long side of the composite element is the long edge zone. The side zone located on the short side of the composite element is the short edge zone. If the four sides of the composite element are of equal length, there is no distinction between the long and short sides. The side zone can then be either the long edge zone or the short side zone. If the composite element is rectangular, the curve zone is the intersection of the lengths of the two sides of the composite element.

[0057] The middle frame of the present disclosure relates to the component used to connect the screen and the back panel (on the side opposite the screen) of the mobile device.

[0058] The composite structure of the present disclosure can comprise the composite layer and the substrate. The composite layer can be arranged directly or indirectly on the surface of the substrate. If the composite layer is arranged indirectly on the surface of the substrate, a buffer layer can be present between the composite layer and the substrate. The buffer layer material can be gaseous or liquid. For example, the gas can be air, nitrogen, helium, neon, argon, krypton, or xenon, etc. The liquid can be water, oil, coolant, or adhesive, etc. If the substrate is plastic or glass, the composite layer cannot be easily arranged on the surface of the substrate. Therefore, an adhesive can be placed between the substrate and the composite layer, so that the composite layer is arranged indirectly on the surface of the substrate, and the strength between the substrate and the composite layer is improved.

[0059] The substrate of the present disclosure can be a semiconductor, a metal, a metal compound, an alloy, a glass, or a carbon fiber, etc. The semiconductor material can be silicon, germanium, gallium arsenide, indium phosphide, gallium nitride, zinc oxide, aluminum nitride, or silicon carbide. The metal can be gold, silver, copper, iron, aluminum, tin, nickel, lead, zinc, titanium, or vanadium. The metal compound can be a metal oxide or a metal nitride. Specifically, the metal oxide can be aluminum oxide, and the metal nitride can be lithium nitride, magnesium nitride, aluminum nitride, titanium nitride, or tantalum nitride. The alloy can be an aluminum alloy, a titanium alloy, or a ferroalloy, the ferroalloy further being stainless steel.

[0060] The composite layer of the present disclosure can comprise at least one film layer, at least two film layers or at least three film layers, wherein the at least one film layer, the at least two film layers or the at least three film layers can comprise an intermediate layer, an alloy layer and an outer surface.

[0061] The intermediate layer described in this disclosure can be used to improve the adhesion between the substrate and the alloy layer. The intermediate layer can be placed between the substrate and the alloy layer, which may consist of a metal oxide or a non-metallic oxide, such as aluminum oxide, silicon dioxide, titanium dioxide, zirconium dioxide, magnesium oxide, calcium oxide, lithium oxide, sodium oxide, potassium oxide, copper oxide, and zinc oxide, etc.

[0062] The alloy layer of the present disclosure may comprise at least three metals, at least four metals, or at least five metals. Specifically, the alloy layer may comprise zirconium, copper, aluminum, niobium, nickel, titanium, beryllium, magnesium, calcium, strontium, scandium, yttrium, hafnium, vanadium, tantalum, chromium, molybdenum, manganese, iron, cobalt, palladium, platinum, silver, gold, gallium, indium, germanium, tin, antimony, bismuth, and polonium. The weight percentage of zirconium in the alloy layer may be 58%, 65%, 66%, 67%, 68%, 70%, 75%, or 76%. The weight percentage of copper in the alloy layer may be 10%, 14%, 18%, 20%, 22%, or 28%. The weight percentage of aluminum in the alloy layer can be 2%, 3%, 3.5%, 4%, 5%, 5.5%, or 6%. The aforementioned alloy layer can be an amorphous alloy.An alloy is a mixture of at least two elements, where one of the at least two elements is a metal. An amorphous alloy refers to alloys with an amorphous structure in a disordered state.

[0063] The outer surface of the present disclosure can be used to protect the alloy layer. The outer surface can be located on the air-facing side of the alloy layer, which may be a metal coating or an anodic oxide layer. The metal coating may be gold plating, nickel plating, chrome plating, or tin plating, etc. The anodic oxide layer may be a metal oxide, such as aluminum oxide, magnesium oxide, or titanium dioxide, etc.

[0064] The hardness referred to in this disclosure is Vickers hardness. Hardness is measured using a square pyramid diamond, and the area of ​​the angle between the opposing faces is 136°. The unit of hardness is the Vickers hardness value (HV value).

[0065] The thickness of the substrate and the alloy layer of the present disclosure is determined by taking three points at any location on the same surface of the composite structure and drawing a vertical normal line. The vertical normal line should pass through both the substrate and the alloy layer. The thickness along the vertical normal line is taken as the vertical thickness, and the vertical thickness at each of the three points is taken as the thickness of the substrate and the alloy layer.

[0066] The total length of the composite layer in the curve zone of the present disclosure refers to the maximum total length of the composite layer that can be achieved in each horizontal cross-section in the curve zone of the flat composite element.

[0067] The total length of the composite layer in the long edge region of the present disclosure refers to the maximum total length of the composite layer that can be achieved in each horizontal cross-section in the long edge region of the flat composite element.

[0068] The total length of the composite layer in the short boundary region of the present disclosure refers to the maximum total length of the composite layer that can be achieved in any horizontal cross-section in the short boundary region of the flat composite element. As in Fig.As shown in Figure 2, the composite structure 110 has the total length of the multiple composite layers 112 in the short edge region 103. However, the horizontal cross-section P should be used as the evaluation criterion. The maximum value from the total length of the composite layer 112 that corresponds to the two horizontal cross-sections P in Figure 2 is selected. Fig. 2 corresponds, and this is used as the total length in the short edge area 103 of the composite layer 112.

[0069] The horizontal cross-section of the present disclosure refers to a virtual plane that runs parallel to the horizontal plane and intersects the composite element.

[0070] The area of ​​the composite layer in the composite element of the present disclosure refers to a single surface of the composite element, the projected area of ​​the composite layer on the single surface.

[0071] The area of ​​the substrate in the composite element of the present disclosure refers to a single surface of the composite element, the projected area of ​​the substrate on the single surface.

[0072] The projected area of ​​the present disclosure refers to an area of ​​the surface that is projected onto the horizontal plane, the projected area being usable for standardizing the calculation of the three-dimensional area of ​​any surface.

[0073] Unless otherwise specified, the measurement environment in this disclosure is measured at a room temperature of 25 °C and a relative humidity of 50%.

[0074] The technical features of the composite element of the present disclosure can be combined and configured to achieve the desired effects.

[0075] According to one embodiment of a further aspect of the present disclosure, a mobile device comprises the composite element according to the aforementioned aspect, wherein the mobile device is a mobile phone or a tablet computer.

[0076] According to a further embodiment of another aspect of the present disclosure, a mobile device comprises the composite element according to the aforementioned aspect.

[0077] The mobile device of the present disclosure can be a camera, a camcorder, a video camera, a mobile phone, a tablet computer, a laptop, a mobile gaming device, a watch, a wristband, augmented reality glasses, virtual reality glasses, an augmented reality headset and a virtual reality headset, etc. <Beispiel 1>

[0078] Reference is made to Fig. 1, Fig. 2 and Fig. 3, wherein Fig.1 a schematic view of a front of the mobile device 10 according to Example 1 of the present disclosure is, Fig. 2 a schematic view of the composite element of the mobile device 10 of Fig. 1 is, viewed from the short boundary region 103, and Fig. 3 a schematic view of the back of the mobile device 10 in Fig. 1 is. The mobile device 10 from Example 1 can be a mobile phone, and the mobile device 10 comprises a composite element 11, a composite element 12 and a screen 13.

[0079] In example 1, the composite element 11 is a middle frame of the mobile phone, the composite element 12 is a back panel of the mobile phone, and the composite element 11 is connected between the screen 13 and the composite element 12.

[0080] As in Fig. 1 and Fig.As shown in Figure 2, the composite element 11 has a curved zone 101, a long edge region 102, and a short edge region 103, and the composite element 11 comprises a composite structure 110. The composite structure 110 comprises a substrate 111 and a composite layer 112, the composite layer 112 being arranged on a surface of the substrate 111. The composite layer 112 comprises an alloy layer 113, an outer surface 114, and an intermediate layer 115. The alloy layer 113 is located between the outer surface 114 and the intermediate layer 115. The outer surface 114 is located on the air-facing side of the alloy layer 113 in the vicinity of the air A, while the intermediate layer 115 is located between the alloy layer 113 and the substrate 111.

[0081] Reference is made to Table 1A, which shows the compositions of alloy layer 113 and their proportions in Example 1. In Example 1, alloy layer 113 is an amorphous alloy, alloy layer 113 comprises at least three metals, and the at least three metals comprise zirconium, copper, aluminum, and niobium. Table 1A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum niobium Pzr (%) 70 Pcu (%) 24 Pal (%) 4 Weight percentage of niobium in the alloy layer (%) 2 Pzr+Pcu+Pal (%) 98

[0082] As shown in Table 1A, a weight percentage of zirconium in alloy layer 113 is Pzr, a weight percentage of copper in alloy layer 113 is Pcu, a weight percentage of aluminum in alloy layer 113 is Pal, and in Example 1, a total weight percentage of zirconium, copper, and aluminum in alloy layer 113 is 98%.

[0083] Reference is made to Table 1B, which shows the parameter details of the composite element 11 from Example 1, where the density of the alloy layer 113 is Da, the hardness of the alloy layer 113 is Ha, the thermal conductivity coefficient of the alloy layer 113 is TCa, the thickness of the alloy layer 113 is Ta, the density of the substrate 111 is Ds, the hardness of the substrate 111 is Hs, the thermal conductivity coefficient of the substrate 111 is TCs, the thickness of the substrate 111 is Ts, the total length of the composite layer 112 in the curve zone 101 LCc, the total length of the composite layer 112 in the long edge region 102 LLc, the total length of the composite layer 112 in the short edge region 103 LSc, the length of the curve zone 101 Lc, the length of the long edge region 102 LI, and the length of the short edge region 103 Ls is. Table 1B Yes (g / cm 3 ) 6,68 Ts (mm) 2,5 Ha (HV) 480 LCc (mm) 10,00 TCa (W / mK) 2,5 LLC (mm) 20,00 Ta (mm) 0,70 LSc (mm) 35,75 Substrate material Aluminum alloy Lc (mm) 11,74 Ds (g / cm 3 ) 2,82 LI (mm) 134,64 Hs (HV) 68 Ls (mm) 56,54 TCs (W / mK) 125 Parameter calculation Da / Ds 2,37 LCc / Lc 0,85 Ha / Hs 7,06 LLC / LI 0,15 TCs / TCa 50,00 LSc / Ls 0,63 Ta / Ts 0,28

[0084] In Example 1, the substrate material 111 is an aluminum alloy, the total length of the composite layer 112 in the curved zone 101 is 10.00 mm, the total length of the composite layer 112 in the long edge region 102 is 20.00 mm, the total length of the composite layer 112 in the short edge region 103 is 35.75 mm, the length of the curved zone 101 is 11.74 mm, the length of the long edge region 102 is 134.64 mm and the length of the short edge region 103 is 56.54 mm. Furthermore, due to the composite structure 110, which has a total length of the several composite layers 112 at the short edge region 103, the horizontal cross-section P is used as a criterion, and the maximum value is selected from the total length of the composite layer 112, which corresponds to the two horizontal cross-sections P, and is selected as the total length LSc of the composite layer 112 at the short edge region 103.

[0085] As in Fig.As shown in Figure 3, the composite element 12 comprises a composite structure 120, wherein the composite structure 120 includes a substrate (not shown in the figure) and a composite layer (not shown in the figure), and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a glass and the composite layer comprises the alloy layer. Furthermore, the composite layer of the composite structure 120 of the composite element 12 and the parameter details of the alloy layer are identical to the composite layer 112 of the composite structure 110 of the composite element 11 and the alloy layer 113, so that the same details are shown in the preceding paragraphs and are not described again here.

[0086] Reference is made to Table 1C, which shows the parameter details of the composite element 12 from Example 1, where one area of ​​the composite layer in the composite element 12 is Ac and one area of ​​the substrate in the composite element 12 is As. Table 1C Ac (mm 2 ) 4200,00 Ac / As 0,397 As (mm 2 ) 10578,02

[0087] Furthermore, a mobile device size of 10 is used Fig. 1 to Fig. 3. For illustration purposes only, the actual values ​​for each parameter are based on the values ​​listed in Tables 1A to 1C. Furthermore, the definitions of the data in the tables of the following embodiments are not described again if they are the same as those in Tables 1A to 1C. <Beispiel 2>

[0088] A mobile device from Example 2 can be a mobile phone, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the mobile phone and the second composite element is a rear panel of the mobile phone.

[0089] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, and niobium.

[0090] Reference is made to Table 2A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 2. Table 2A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum niobium Pzr (%) 70 Pcu (%) 24 Pal (%) 4 Weight percentage of niobium in the alloy layer (%) 2 Pzr+Pcu+Pal (%) 98

[0091] In Example 2, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 98%.

[0092] Reference is made to Table 2B, which shows the parameter details of the first composite element from Example 2. Table 2B Yes (g / cm 3 ) 6,68 Ts (mm) 2,0 Ha (HV) 480 LCc (mm) 11,00 TCa (W / mK) 2,5 LLC (mm) 20,00 Ta (mm) 0,65 LSc (mm) 38,80 Substrate material Aluminum alloy Lc (mm) 12,80 Ds (g / cm 3 ) 2,81 Ll (mm) 146,70 Hs (HV) 162 Ls (mm) 61,30 TCs (W / mK) 163 Parameter calculation Da / Ds 2,38 LCc / Lc 0,86 Ha / Hs 2,96 LLC / LI 0,14 TCs / TCa 65,20 LSc / Ls 0,63 Ta / Ts 0,33

[0093] In Example 2, the substrate material of the first composite element is an aluminum alloy. The total length of the composite layer in the curved zone is 11.00 mm. The total length of the composite layer in the long edge region is 20.00 mm. The total length of the composite layer in the short edge region is 38.80 mm. The length of the curved zone is 12.80 mm. The length of the long edge region is 146.70 mm. The length of the short edge region is 61.30 mm.

[0094] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a plastic and the composite layer includes an alloy layer. Furthermore, the parameter details of the composite layer and the alloy layer of the composite structure of the second composite element from Example 2 can be identical to the parameter details of the composite layer and the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0095] Reference is made to Table 2C, which shows the parameter details of the second composite element from Example 2. Table 2C Ac (mm 2 ) 5000,00 Ac / As 0,400 As (mm 2 ) 12508,26 <Beispiel 3>

[0096] A mobile device from Example 3 can be a tablet computer, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the tablet computer and the second composite element is a rear panel of the tablet computer.

[0097] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, and niobium.

[0098] Reference is made to Table 3A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 3. Table 3A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum niobium Pzr (%) 70 Pcu (%) 24 Pal (%) 4 Weight percentage of niobium in the alloy layer (%) 2 Pzr+Pcu+Pal (%) 98

[0099] In Example 3, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 98%.

[0100] Reference is made to Table 3B, which shows the parameter details of the first composite element from Example 3. Table 3B Yes (g / cm 3 ) 6,68 Ts (mm) 1,5 Ha (HV) 480 LCc (mm) 12,00 TCa (W / mK) 2,5 LLC (mm) 15,00 Ta (mm) 1,20 LSc (mm) 8,00 Substrate material Aluminum alloy Lc (mm) 15,34 Ds (g / cm 3 ) 2,69 Ll (mm) 175,86 Hs (HV) 83 Ls (mm) 115,26 TCs (W / mK) 200 Parameter calculation Da / Ds 2,48 LCc / Lc 0,78 Ha / Hs 5,78 LLC / LI 0,09 TCs / TCa 80,00 LSc / Ls 0,07 Ta / Ts 0,80

[0101] In Example 3, the substrate material of the first composite element is an aluminum alloy. The total length of the composite layer in the curved zone is 12.00 mm. The total length of the composite layer in the long edge region is 15.00 mm. The total length of the composite layer in the short edge region is 8.00 mm. The length of the curved zone is 15.34 mm. The length of the long edge region is 175.86 mm. The length of the short edge region is 115.26 mm.

[0102] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is an aluminum alloy and the composite layer comprises an alloy layer. Furthermore, the parameter details of the composite layer and the alloy layer of the composite structure of the second composite element from Example 3 can be identical to the parameter details of the composite layer and the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0103] Reference is made to Table 3C, which shows the parameter details of the second composite element from Example 3. Table 3C Ac (mm 2 ) 10000,00 Ac / As 1 0,383 As (mm 2 ) 26137,95 <Beispiel 4>

[0104] A mobile device from Example 4 can be a tablet computer, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the tablet computer and the second composite element is a rear panel of the tablet computer.

[0105] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, and niobium.

[0106] Reference is made to Table 4A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 4. Table 4A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum niobium Pzr (%) 70 Pcu (%) 24 Pal (%) 4 Weight percentage of niobium in the alloy layer (%) 2 Pzr+Pcu+Pal (%) 98

[0107] In Example 4, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 98%.

[0108] Reference is made to Table 4B, which shows the parameter details of the first composite element from Example 4. Table 4B Yes (g / cm 3 ) 6,68 Ts (mm) 1,0 Ha (HV) 480 LCc (mm) 19,52 TCa (W / mK) 2,5 LLC (mm) 20,00 Ta (mm) 1,00 LSc (mm) 8,00 Substrate material titanium alloy Lc (mm) 19,52 Ds (g / cm 3 ) 4,51 Ll (mm) 223,74 Hs (HV) 350 Ls (mm) 154,64 TCs (W / mK) 15,24 Parameter calculation Da / Ds 1,48 LCc / Lc 1,00 Ha / Hs 1,37 LLC / LI 0,09 TCs / TCa 6,10 LSc / Ls 0,05 Ta / Ts 1,00

[0109] In Example 4, the material of the first composite element is a titanium alloy. The total length of the composite layer in the curved zone is 19.52 mm. The total length of the composite layer in the long edge region is 20.00 mm. The total length of the composite layer in the short edge region is 8.00 mm. The length of the curved zone is 19.52 mm. The length of the long edge region is 223.74 mm. The length of the short edge region is 154.64 mm.

[0110] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a titanium alloy and the composite layer comprises an alloy layer. Furthermore, the parameter details of the composite layer and the alloy layer of the composite structure of the second composite element from Example 4 can be identical to the parameter details of the composite layer and the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0111] Reference is made to Table 4C, which shows the parameter details of the second composite element from Example 4. Table 4C Ac (mm 2 ) 15000,00 Ac / As 1 0,339 As (mm 2 ) 44296,78 <Beispiel 5>

[0112] A mobile device from Example 5 can be a tablet computer, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the tablet computer and the second composite element is a rear panel of the tablet computer.

[0113] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, and niobium.

[0114] Reference is made to Table 5A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 5. Table 5A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum niobium Pzr (%) 70 Pcu (%) 24 Pal (%) 4 Weight percentage of niobium in the alloy layer (%) 2 Pzr+Pcu+Pal (%) 98

[0115] In Example 5, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 98%.

[0116] Reference is made to Table 5B, which shows the parameter details of the first composite element from Example 5. Table 5B Yes (g / cm 3 ) 6,68 Ts (mm) 0,5 Ha (HV) 480 LCc (mm) 19,60 TCa (W / mK) 2,5 LLC (mm) 20,00 Ta (mm) 0,50 LSc (mm) 8,00 Substrate material titanium alloy Lc (mm) 19,60 Ds (g / cm 3 ) 4,51 Ll (mm) 224,73 Hs (HV) 350 Ls (mm) 152,53 TCs (W / mK) 15,24 Parameter calculation Da / Ds 1,48 LCc / Lc 1,00 Ha / Hs 1,37 LLC / LI 0,09 TCs / TCa 6,10 LSc / Ls 0,05 Ta / Ts 1,00

[0117] In Example 5, the material of the first composite element is a titanium alloy. The total length of the composite layer in the curved zone is 19.60 mm. The total length of the composite layer in the long edge region is 20.00 mm. The total length of the composite layer in the short edge region is 8.00 mm. The length of the curved zone is 19.60 mm. The length of the long edge region is 224.73 mm. The length of the short edge region is 152.53 mm.

[0118] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a glass and the composite layer includes an alloy layer. Furthermore, the parameter details of the composite layer and the alloy layer of the composite structure of the second composite element from Example 5 can be identical to the parameter details of the composite layer and the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0119] Reference is made to Table 5C, which shows the parameter details of the second composite element from Example 5. Table 5C Ac (mm 2 ) 19000,00 Ac / As 0,432 As (mm 2 ) 43991,94 <Beispiel 6>

[0120] A mobile device from Example 6 can be a watch, and the mobile device comprises a first composite element and a second composite element. In Example 6, the first composite element is a middle frame of the watch and the second composite element is a front frame of the watch.

[0121] The first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals comprising zirconium, copper, aluminum, and niobium.

[0122] Reference is made to Table 6A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 6. Table 6A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum niobium Pzr (%) 70 Pcu (%) 24 Pal (%) 4 Weight percentage of niobium in the alloy layer 2 (%) Pzr+Pcu+Pal (%) 98

[0123] In Example 6, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 98%.

[0124] Reference is made to Table 6B, which shows the parameter details of the first composite element from Example 6, where one of the materials of the first composite element is a titanium alloy. Table 6B Yes (g / cm 3 ) 6,68 Ds (g / cm 3 ) 4,51 Ha (HV) 480 Hs (HV) 155 TCa (W / mK) 2,5 TCs (W / mK) 15,24 Ta (mm) 0,75 Ts (mm) 0,8 Parameter calculation Da / Ds 1,48 TCs / TCa 6,10 Ha / Hs 3,10 Ta / Ts 0,94

[0125] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a titanium alloy and the composite layer comprises an alloy layer. Furthermore, the parameter details of the alloy layer of the composite structure of the second composite element from Example 6 can be identical to the parameter details of the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0126] Reference is made to Table 6C, which shows the parameter details of the second composite element from Example 6. Table 6C Ac (mm 2 ) 28,15 Ac / As 1 0,018 As (mm 2 ) 1590,43 <Beispiel 7>

[0127] A mobile device from Example 7 can be a tablet computer, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the tablet computer and the second composite element is a rear panel of the tablet computer.

[0128] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, nickel, and niobium.

[0129] Reference is made to Table 7A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 7. Table 7A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum nickel titanium Pzr (%) 65 Pcu (%) 16 Pal (%) 4 Weight percentage of nickel in the alloy layer (%) 12 Weight percentage of titanium in the alloy layer 3 (%) Pzr+Pcu+Pal (%) 85

[0130] In Example 7, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 85%.

[0131] Reference is made to Table 7B, which shows the parameter details of the first composite element from Example 7. Table 7B Yes (g / cm 3 ) 6,65 Ts (mm) 1,0 Ha (HV) 540 LCc (mm) 21,00 TCa (W / mK) 2,5 LLC (mm) 30,00 Ta (mm) 0,85 LSc (mm) 15,00 Substrate material stainless steel Lc (mm) 22,11 Ds (g / cm 3 ) 7,93 Ll (mm) 253,44 Hs (HV) 200 Ls (mm) 187,34 TCs (W / mK) 15 Parameter calculation Da / Ds 0,84 LCc / Lc 0,95 Ha / Hs 2,70 LLC / LI 0,12 TCs / TCa 6,00 LSc / Ls 0,08 Ta / Ts 0,85

[0132] In Example 7, the material of the first composite element is stainless steel. The total length of the composite layer in the curved zone is 21.00 mm. The total length of the composite layer in the long edge region is 30.00 mm. The total length of the composite layer in the short edge region is 15.00 mm. The length of the curved zone is 22.11 mm. The length of the long edge region is 253.44 mm. The length of the short edge region is 187.34 mm.

[0133] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a plastic and the composite layer comprises an alloy layer. Furthermore, the parameter details of the alloy layer of the composite structure of the second composite element from Example 7 can be identical to the parameter details of the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0134] Reference is made to Table 7C, which shows the parameter details of the second composite element from Example 7. Table 7C Ac (mm 2 ) 25000,00 Ac / As 1 0.415 As (mm 2 ) 60265,33 <Beispiel 8>

[0135] A mobile device from Example 8 can be a tablet computer, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the tablet computer and the second composite element is a rear panel of the tablet computer.

[0136] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, nickel, and niobium.

[0137] Reference is made to Table 8A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 8. Table 8A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum nickel titanium Pzr (%) 65 Pcu (%) 16 Pal (%) 4 Weight percentage of nickel in the alloy layer (%) 12 Weight percentage of titanium in the alloy layer (%) 3 Pzr+Pcu+Pal (%) 85

[0138] In Example 8, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 85%.

[0139] Reference is made to Table 8B, which shows the parameter details of the first composite element from Example 8. Table 8B Yes (g / cm 3 ) 6,65 Ts (mm) 1,2 Ha (HV) 540 LCc (mm) 21,50 TCa (W / mK) 2,5 LLC (mm) 30,00 Ta (mm) 0,95 LSc (mm) 18,00 Substrate material stainless steel Lc (mm) 22,40 Ds (g / cm 3 ) 7,93 Ll (mm) 256,86 Hs (HV) 200 Ls (mm) 156,86 TCs (W / mK) 15 Parameter calculation Da / Ds 0,84 LCc / Lc 0,96 Ha / Hs 2,70 LLC / LI 0,12 TCs / TCa 6,00 LSc / Ls 0,11 Ta / Ts 0,79

[0140] In Example 8, the material of the first composite element is stainless steel. The total length of the composite layer in the curved zone is 21.50 mm. The total length of the composite layer in the long edge region is 30.00 mm. The total length of the composite layer in the short edge region is 18.00 mm. The length of the curved zone is 22.40 mm. The length of the long edge region is 256.86 mm. The length of the short edge region is 156.86 mm.

[0141] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is an aluminum alloy and the composite layer comprises an alloy layer. Furthermore, the parameter details of the alloy layer of the composite structure of the second composite element from Example 8 can be identical to the parameter details of the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0142] Reference is made to Table 8C, which shows the parameter details of the second composite element from Example 8. Table 8C Ac (mm 2 ) 23000,00 Ac / As 1 0,438 As (mm 2 ) 52482,30 <Beispiel 9>

[0143] A mobile device from Example 9 can be a tablet computer, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the tablet computer and the second composite element is a rear panel of the tablet computer.

[0144] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, nickel, and niobium.

[0145] Reference is made to Table 9A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 9. Table 9A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum nickel titanium Pzr (%) 65 Pcu (%) 16 Pal (%) 4 Weight percentage of nickel in the alloy layer (%) 12 Weight percentage of titanium in the alloy layer (%) 3 Pzr+Pcu+Pal (%) 85

[0146] In Example 9, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 85%.

[0147] Reference is made to Table 9B, which shows the parameter details of the first composite element from Example 9. Table 9B Yes (g / cm 3 ) 6,65 Ts (mm) 1,2 Ha (HV) 540 LCc (mm) 25,62 TCa (W / mK) 2,5 LLC (mm) 28,00 Ta (mm) 1,05 LSc (mm) 20,00 Substrate material Aluminum alloy Lc (mm) 25,62 Ds (g / cm 3 ) 2,82 Ll (mm) 293,76 Hs (HV) 68 Ls (mm) 175,96 TCs (W / mK) 125 Parameter calculation Da / Ds 2,36 LCc / Lc 1,00 Ha / Hs 7,94 LLC / LI 0,10 TCs / TCa 50,00 LSc / Ls 0,11 Ta / Ts 0,88

[0148] In Example 9, the material of the first composite element is an aluminum alloy. The total length of the composite layer in the curved zone is 25.62 mm. The total length of the long edge region in the composite layer is 28.00 mm. The total length of the short edge region in the composite layer is 20.00 mm. The length of the curved zone is 25.62 mm. The length of the long edge region is 293.76 mm. The length of the short edge region is 175.96 mm.

[0149] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is the titanium alloy and the composite layer comprises the alloy layer. Furthermore, the parameter details of the composite layer and the alloy layer of the composite structure of the second composite element from Example 9 can be identical to the parameter details of the composite layer and the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0150] Reference is made to Table 9C, which shows the parameter details of the second composite element from Example 9. Table 9C Ac (mm 2 ) 34000,00 Ac / As 0,504 As (mm 2 ) 67523,49 <Beispiel 10>

[0151] A mobile device from Example 10 can be a tablet computer, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the tablet computer and the second composite element is a rear panel of the tablet computer.

[0152] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, nickel, and niobium.

[0153] Reference is made to Table 10A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 10. Table 10A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum nickel titanium Pzr (%) 65 Pcu (%) 16 Pal (%) 4 Weight percentage of nickel in the alloy layer (%) 12 Weight percentage of titanium in the alloy layer (%) 3 Pzr+Pcu+Pal (%) 85

[0154] In Example 10, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 85%.

[0155] Reference is made to Table 10B, which shows the parameter details of the first composite element from Example 10. Table 10B Yes (g / cm 3 ) 6,65 Ts (mm) 1,8 Ha (HV) 540 LCc (mm) 19,00 TCa (W / mK) 2,5 LLC (mm) 30,00 Ta (mm) 1,10 LSc (mm) 20,00 Substrate material Aluminum alloy Lc (mm) 19,94 Ds (g / cm 3 ) 2,81 Ll (mm) 228,56 Hs (HV) 162 Ls (mm) 139,79 TCs (W / mK) 163 Parameter calculation Da / Ds 2,37 LCc / Lc 0,95 Ha / Hs 3,33 LLC / LI 0,13 TCs / TCa 65,20 LSc / Ls 0,14 Ta / Ts 0,61

[0156] In Example 10, the substrate material of the first composite element is an aluminum alloy. The total length of the composite layer in the curved zone is 19.00 mm. The total length of the composite layer in the long edge region is 30.00 mm. The total length of the composite layer in the short edge region is 20.00 mm. The length of the curved zone is 19.94 mm. The length of the long edge region is 228.56 mm. The length of the short edge region is 139.79 mm.

[0157] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a glass and the composite layer includes an alloy layer. Furthermore, the parameter details of the composite layer and the alloy layer of the composite structure of the second composite element from Example 10 can be identical to the parameter details of the composite layer and the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0158] Reference is made to Table 10C, which shows the parameter details of the second composite element from Example 10. Table 10C Ac (mm 2 ) 22000,00 Ac / As 1 0,529 As (mm 2 ) 41606,32 <Beispiel 11>

[0159] A mobile device from Example 11 can be a tablet computer, and the mobile device comprises a first composite element and a second composite element, wherein the first composite element is a midframe of the tablet computer and the second composite element is a rear panel of the tablet computer.

[0160] The first composite element has a curved zone, a long edge region, and a short edge region, and the first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals being zirconium, copper, aluminum, nickel, and niobium.

[0161] Reference is made to Table 11A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 11. Table 11A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum nickel titanium Pzr (%) 65 Pcu (%) 16 Pal (%) 4 Weight percentage of nickel in the alloy layer (%) 12 Weight percentage of titanium in the alloy layer (%) 3 Pzr+Pcu+Pal (%) 85

[0162] In Example 11, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 85%.

[0163] Reference is made to Table 11 B, which shows the parameter details of the first composite element from Example 11. Table 11B Yes (g / cm 3 ) 6,65 Ts (mm) 1,3 Ha (HV) 540 LCc (mm) 25,01 TCa (W / mK) 2,5 LLC (mm) 10,00 Ta (mm) 1,15 LSc (mm) 5,00 Substrate material Aluminum alloy Lc (mm) 25,01 Ds (g / cm 3 ) 2,69 Ll (mm) 286,72 Hs (HV) 83 Ls (mm) 174,24 TCs (W / mK) 200 Parameter calculation Da / Ds 2,47 LCc / Lc 1,00 Ha / Hs 6,51 LLC / LI 0,03 TCs / TCa 80,00 LSc / Ls 0,03 Ta / Ts 0,88

[0164] In Example 11, the material of the first composite element is an aluminum alloy. The total length of the composite layer in the curved zone is 25.01 mm. The total length of the composite layer in the long edge region is 10.00 mm. The total length of the composite layer in the short edge region is 5.00 mm. The length of the curved zone is 25.01 mm. The length of the long edge region is 286.72 mm. The length of the short edge region is 174.24 mm.

[0165] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a plastic and the composite layer comprises an alloy layer. Furthermore, the parameter details of the alloy layer of the composite structure of the second composite element from Example 11 can be identical to the parameter details of the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0166] Reference is made to Table 11C, which shows the parameter details of the second composite element from Example 11. Table 11 C Ac (mm 2 ) 35000,00 Ac / As 0,537 As (mm 2 ) 65122,47 <Beispiel 12>

[0167] A mobile device from Example 12 can be a watch, and the mobile device comprises a first composite element and a second composite element. In Example 12, the first composite element is a middle frame of the watch and the second composite element is a front frame of the watch.

[0168] The first composite element comprises a composite structure. The composite structure comprises a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate. The composite layer comprises an alloy layer, wherein the alloy layer is an amorphous alloy, the alloy layer comprising at least three metals, and the at least three metals comprising zirconium, copper, aluminum, nickel, and niobium.

[0169] Reference is made to Table 12A, which shows the compositions of the alloy layer of the first composite element and their proportions in Example 12. Table 12A Structure of the alloy layer Amorphous alloy composition zirconium copper aluminum nickel titanium Pzr (%) 65 Pcu (%) 16 Pal (%) 4 Weight percentage of nickel in the alloy layer (%) 12 Weight percentage of titanium in the alloy layer (%) 3 Pzr+Pcu+Pal (%) 85

[0170] In Example 12, the weight percentage of zirconium, copper and aluminium in the alloy layer of the first composite element is 85%.

[0171] Reference is made to Table 12B, which shows the parameter details of the first composite element from Example 12, where one of the materials of the first composite element is a titanium alloy. Table 12B Yes (g / cm 3 ) 6,65 Ds (g / cm 3 ) 4,51 Ha (HV) 540 Hs (HV) 350 TCa (W / mK) 2,5 TCs (W / mK) 15,24 Ta (mm) 0,60 Ts (mm) 0,8 Parameter calculation Da / Ds 1,47 TCs / TCa 6,10 Ha / Hs 1,54 Ta / Ts 0,75

[0172] The second composite element comprises a composite structure, wherein the composite structure includes a substrate and a composite layer, and the composite layer is arranged on a surface of the substrate, wherein one material of the substrate is a titanium alloy and the composite layer comprises an alloy layer. Furthermore, the parameter details of the alloy layer of the composite structure of the second composite element from Example 12 can be identical to the parameter details of the alloy layer of the composite structure of the first composite element, such that the same details are shown in the preceding paragraphs and are not described again here.

[0173] Reference is made to Table 12C, which shows the parameter details of the second composite element from Example 12. Table 12C Ac (mm 2 ) 79,33 Ac / As 1 0,039 As (mm 2 ) 2042,82 <Beispiel 13>

[0174] Reference is made to Fig.4, which is a schematic view of a front of the mobile device 20 according to Example 13 of the present disclosure.

[0175] A mobile device 20 from Example 13 is a watch, and the mobile device comprises a composite element 21 and a surface 22, wherein the composite element 21 is the central frame of the watch and the composite element 21 surrounds the circumferential surface of the surface 22. The composite element 21 comprises a composite structure 210, wherein the composite structure 210 comprises a substrate (not shown in the figure) and a composite layer (not shown in the figure), and the composite layer is arranged on a surface of the substrate.

[0176] Furthermore, the mobile device 20 from Example 13 may be the same configuration sample as the mobile devices from Example 6 and Example 12, so the relevant details can be found in the descriptions of Example 6 and Example 12 and are not described again here.

[0177] <Beispiel 14> Reference is made to Fig. 5 and Fig. 6, wherein Fig. 5 a schematic view of a front of the mobile device 30 according to Example 14 of the present disclosure and Fig. 6 a side view of the mobile device 30 in Fig. 5 is.

[0178] A mobile device from Example 14 is a watch, and the watch comprises a composite element 31 and a surface 32, wherein the composite element 31 is the front frame of the watch and the composite element 31 surrounds the circumferential surface of the surface 32. The composite element 31 comprises a composite structure 310, wherein the composite structure 310 comprises a substrate (not shown in the figure) and a composite layer 312, and the composite layer 312 is arranged on a surface of the substrate.

[0179] As in Fig.As shown in Figure 6, a region Ac of the composite layer 312 on the composite element 31 refers to the area of ​​the composite layer 312 that is projected onto a single surface of the composite element 31, while a region As of the substrate on the composite element 31 refers to the area of ​​the substrate that is projected onto a single surface of the composite element 31.

[0180] Furthermore, the mobile device 30 from Example 14 may be the same configuration sample as the mobile devices from Example 6 and Example 12, so the relevant details can be found in the descriptions of Example 6 and Example 12 and are not described again here. <Beispiel 15>

[0181] Reference is made to Fig.Figure 7, which is a schematic view of part of the composite element 41 according to Example 15 of the present disclosure. The composite element 41 comprises a composite structure 410, wherein the composite structure 410 comprises a substrate 411 and a composite layer 412, and the composite layer 412 is arranged on a surface of the substrate 411.

[0182] In Example 15, the composite structure 410 further comprises a buffer layer 413, wherein the buffer layer 413 is located between the composite layer 412 and the substrate 411 to avoid direct damage to the lower hardness of the substrate 411 when the composite structure 410 is subjected to an impact.

[0183] Furthermore, the composite element 41 from Example 15 can be applied to the mobile devices from Example 1 to Example 12, so that the corresponding details can be found in the descriptions of Example 1 to Example 12 and are not described again here.

Claims

[1] Composite element (11, 12, 21, 31, 41), comprising: a composite structure (110, 120, 210, 310, 410) with a substrate (111, 411) and a composite layer (112, 312, 412), wherein the composite layer (112, 312, 412) is arranged on a surface of the substrate (111, 411); wherein a material of the substrate (111, 411) is an aluminum alloy and the composite layer (112, 312, 412) comprises an alloy layer (113); wherein the alloy layer (113) comprises at least three metals, wherein the at least three metals comprise zirconium, copper and aluminium; wherein the composite element (11, 12, 21, 31, 41) has a curved zone (101), a total length of the composite layer (112, 312, 412) in the curved zone (101) is LCc, a length of the curved zone (101) is Lc, a thickness of the alloy layer (113) is Ta, a thickness of the substrate (111, 411) is Ts and the following conditions are met: 0.75≤LCc / Lc; and 0.50≤Ta / Ts≤1.

00. [2] Composite element (11, 12, 21, 31, 41) according to claim 1, wherein a weight percentage of the zirconium in the alloy layer (113) is Pzr, a weight percentage of the copper in the alloy layer (113) is Pcu, a weight percentage of the aluminium in the alloy layer (113) is Pal and the following conditions are met: 60%≤Pzr≤90%; 5%≤Pcu≤23%; and 2%≤Pal≤6%. [3] Composite element (11, 12, 21, 31, 41) according to claim 1, wherein the density of the alloy layer (113) is Da, the density of the substrate (111, 411) is Ds and the following condition is met: 1.5≤Da / Ds≤3.

5. [4] Composite element (11, 12, 21, 31, 41) according to claim 1, wherein a thermal conductivity coefficient of the alloy layer (113) is TCa, a thermal conductivity coefficient of the substrate (111, 411) is TCs and the following condition is met: 30≤TCs / TCa. [5] Composite element (11, 12, 21, 31, 41) according to claim 1, wherein the hardness of the alloy layer (113) is Ha and the following condition is met: 400 HV≤Ha≤1000 HV. [6] Composite element (11, 12, 21, 31, 41) according to claim 5, wherein the hardness of the alloy layer (113) is Ha, the hardness of the substrate (111, 411) is Hs and the following condition is met: 5.00≤Ha / Hs≤10.

00. [7] Composite element (11, 12, 21, 31, 41) according to claim 1, wherein the thickness of the alloy layer (113) is Ta and the following condition is met: 0.5 mm≤Ta≤1.5 mm. [8] Composite element (11, 12, 21, 31, 41) according to claim 1, wherein the composite structure (110, 120, 210, 310, 410) further comprises: a buffer layer (413) located between the composite layer (112, 312, 412) and the substrate (111, 411). [9] Composite element (11, 12, 21, 31, 41) according to claim 1, wherein the composite element (11, 12, 21, 31, 41) is a central frame and the composite element (11, 12, 21, 31, 41) has a long edge region (102) and a short edge region (103). [10] Composite element (11, 12, 21, 31, 41) according to claim 9, wherein the total length of the composite layer (112, 312, 412) in the curve zone (101) is LCc, the length of the curve zone (101) is Lc and the following condition is met: 0.85≤LCc / Lc. [11] Composite element (11, 12, 21, 31, 41) according to claim 10, wherein a total length of the composite layer (112, 312, 412) in the long edge region (102) is LLc, a length of the long edge region (102) is LI and the following condition is satisfied: 0 <LLc / Ll≤0,15. [12] Composite element (11, 12, 21, 31, 41) according to claim 11, wherein a total length of the composite layer (112, 312, 412) in the short edge region (103) is LSc, a length of the short edge region (103) is Ls and the following condition is satisfied: 0.05≤LSc / Ls≤0.

15. [13] Mobile device (10, 20, 30) comprising: the composite element (11, 12, 21, 31, 41) according to claim 1, wherein the mobile device (10, 20, 30) is a mobile phone or a tablet computer. [14] Composite element (11, 12, 21, 31, 41), comprising: a composite structure (110, 120, 210, 310, 410) with a substrate (111, 411) and a composite layer (112, 312, 412), wherein the composite layer (112, 312, 412) is arranged on a surface of the substrate (111, 411); wherein the composite layer (112, 312, 412) comprises an alloy layer (113); wherein the alloy layer (113) comprises at least three metals, wherein the at least three metals comprise zirconium, copper and aluminium; where a region of the composite layer (112, 312, 412) in the composite element (11, 12, 21, 31, 41) is Ac, a region of the substrate (111, 411) in the composite element (11, 12, 21, 31, 41) is As, a thickness of the alloy layer (113) is Ta, a thickness of the substrate (111, 411) is Ts and the following conditions are met: 0.200≤Ac / As; and 0.20≤Ta / Ts≤2.

00. [15] Composite element (11, 12, 21, 31, 41) according to claim 14, wherein a weight percentage of the zirconium in the alloy layer (113) is Pzr, a weight percentage of the copper in the alloy layer (113) is Pcu, a weight percentage of the aluminium in the alloy layer (113) is Pal and the following condition is met: 95%≤Pzr+Pcu+Pal [16] Composite element (11, 12, 21, 31, 41) according to claim 14, wherein the hardness of the alloy layer (113) is Ha and the following condition is met: 300 HV≤Ha. [17] Composite element (11, 12, 21, 31, 41) according to claim 16, wherein the hardness of the substrate (111, 411) is Hs and the following condition is met: Hs≤250 HV. [18] Composite element (11, 12, 21, 31, 41) according to claim 17, wherein the density of the alloy layer (113) is Da, the density of the substrate (111, 411) is Ds and the following condition is met: Da / Ds≤5,0. [19] Composite element (11, 12, 21, 31, 41) according to claim 18, wherein a thermal conductivity coefficient of the substrate (111, 411) is TCs and the following condition is met: 5 W / mK≤TCs. [20] Composite element (11, 12, 21, 31, 41) according to claim 19, wherein a thermal conductivity coefficient of the alloy layer (113) is TCa, the thermal conductivity coefficient of the substrate (111, 411) is TCs and the following condition is met: 5≤TCs / TCa. [21] Composite element (11, 12, 21, 31, 41) according to claim 20, wherein a material of the substrate (111, 411) is an aluminium alloy, a titanium alloy or a stainless steel. [22] Composite element (11, 12, 21, 31, 41) according to claim 14, wherein the thickness of the alloy layer (113) is Ta and the following condition is met: 0.3 mm <Ta. [23] Composite element (11, 12, 21, 31, 41) according to claim 14, wherein the composite element (11, 12, 21, 31, 41) is a back panel or a front frame. [24] Composite element (11, 12, 21, 31, 41) according to claim 23, wherein the region of the composite layer (112, 312, 412) in the composite element (11, 12, 21, 31, 41) is Ac, the region of the substrate (111, 411) in the composite element (11, 12, 21, 31, 41) is As and the following condition is met: 0.350≤Ac / As≤0.

450. [25] Mobile device (10, 20, 30) comprising: the composite element (11, 12, 21, 31, 41) according to claim 23. [26] Composite element (11, 12, 21, 31, 41) according to claim 25, wherein the composite element (11, 12, 21, 31, 41) has a curved zone (101), a long edge region (102) and a short edge region (103) and the alloy layer (113) is an amorphous alloy; where the hardness of the alloy layer (113) is Ha, the hardness of the substrate (111, 411) is Hs, the thickness of the alloy layer (113) is Ta, the thickness of the substrate (111, 411) is Ts, the total length of the composite layer (112, 312, 412) in the curve zone (101) is LCc, the length of the curve zone (101) is Lc, the total length of the composite layer (112, 312, 412) in the long edge region (102) is LLc, the length of the long edge region (102) is LI, the total length of the composite layer (112, 312, 412) in the short edge region (103) is LSc, the length of the short edge region (103) is Ls, and the following conditions are met: 6.00≤Ha / Hs≤8.00; 0.60≤Ta / Ts≤0.90; 0.90≤LCc / Lc≤1.00; 0.05≤LLc / LI≤0.10; and 0.10≤LSc / Ls≤0.13.

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