Aluminum alloy blank for liquid crystal panel display equipment and preparation method of aluminum alloy blank

Abstract

The invention provides an aluminum alloy blank for liquid crystal panel display equipment and a preparation method of the aluminum alloy blank, the preparation method belongs to a deformation processing technological method, the preparation method comprises rolling, solution treatment, stretching and aging treatment which are carried out in sequence, the average internal structure grain of the obtained aluminum alloy blank is 200 microns or below, the internal structure grain is evenly distributed, the hardness and tensile strength are appropriate, and the thickness is 10-20 micrometers. The liquid crystal display panel can be applied to the field of liquid crystal panel display equipment and has excellent use performance.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal panel display devices, and in particular to an aluminum alloy blank for liquid crystal panel display devices and a preparation method thereof. Background Art

[0002] Liquid crystal panel is the material that determines the brightness, contrast, color and viewing angle of LCD panel display devices. The price trend of LCD panel directly affects the price of LCD panel display devices. The quality and technology of LCD panel are related to the overall performance of LCD panel display devices.

[0003] Aluminum alloy materials are widely used in fields such as liquid crystal panel display equipment. They are very important raw materials and have high requirements for the uniformity of the internal structure, hardness, tensile strength and other properties of the blanks. Therefore, there are high requirements for the entire processing and deformation process of the blanks. Limited by technical conditions, there has been very little research on the deformation process of this alloy material in China. The demand for blanks basically relies on imports, which is costly and has a long cycle.

[0004] Physical vapor deposition (PVD) is one of the most critical processes in the production of semiconductor chips and TFT-LCDs. The sputtering metal target for PVD is one of the most important raw materials in the production of semiconductor chips and the preparation and processing of TFT-LCDs. According to the principle of sputtering technology, the finer the target grains, the more uniform the composition structure, the smaller the surface roughness of the target, and the better the quality of the thin film formed on the silicon wafer by the physical vapor deposition method. Therefore, it is particularly important to refine the size of the target grains. Usually, the grain size of high-purity aluminum target materials is less than 200μm. However, according to the solidification characteristics of pure metals, the higher the purity and cleanliness of the metal, the lower the probability of heterogeneous nucleation during solidification, the easier it is for the solidified grains to grow, and it is easy to grow as cellular crystals along the preferred growth surface. The minimum size of the high-purity aluminum grains obtained by controlling the solidification process can only reach 2mm in diameter. Therefore, seeking a new process method to refine the grain size has become an urgent problem to be solved.

[0005] CN 113061853 A discloses a high-purity aluminum or aluminum alloy target material and a preparation method and use thereof. The preparation method comprises the following steps: subjecting an aluminum or aluminum alloy target material blank to forging, primary heat treatment, forging, secondary heat treatment and rolling in sequence to obtain a high-purity aluminum or aluminum alloy target material; the temperature of the primary heat treatment is 345-355°C; the temperature of the secondary heat treatment is 290-310°C; the preparation method significantly refines the grain size by optimizing the heat treatment process, and solves the problems of grain uniformity and use performance of large-size targets.

[0006] CN 113061852 A discloses a high-purity aluminum or aluminum alloy target material and a preparation method thereof. The preparation method comprises the following steps: subjecting an aluminum or aluminum alloy target material blank to forging and stretching, primary heat treatment, forging, secondary heat treatment, rolling and tertiary heat treatment in sequence to obtain a high-purity aluminum or aluminum alloy target material; the number of rolling passes is 3-5 times; the pressure drop of the rolling decreases with the number of passes; the preparation method significantly refines the grain size and improves the uniformity of the grains by optimizing the rolling process.

[0007] In summary, it is necessary to develop a new method for preparing aluminum alloy billets for liquid crystal panel display devices. Summary of the invention

[0008] In view of the problems existing in the prior art, the present invention provides an aluminum alloy billet for liquid crystal panel display equipment and a preparation method thereof. The preparation method belongs to a deformation processing method, including rolling, solution treatment, stretching, and aging treatment performed in sequence. The obtained aluminum alloy billet has an internal structure with an average grain size of less than 200 μm and uniform distribution, suitable hardness and tensile strength, can be applied to the field of liquid crystal panel display equipment, and has excellent performance.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] One of the purposes of the present invention is to provide a method for preparing an aluminum alloy blank for a liquid crystal panel display device, the preparation method comprising the following steps:

[0011] Prepare aluminum alloy raw materials; the mass composition of the aluminum alloy raw materials includes: Si 0.4-0.8%, Fe <0.7%, Cu 0.15-0.40%, Mn <0.15%, Mg 0.8-1.2%, Cr 0.04-0.35%, Zn <0.25%, Ti <0.15%, and the balance is Al;

[0012] The aluminum alloy raw material is sequentially subjected to rolling, solution treatment, stretching, and aging treatment to obtain an aluminum alloy billet for a liquid crystal panel display device.

[0013] The preparation method of the present invention is aimed at the composition characteristics of 6000 series aluminum alloys, that is, 6000 series aluminum alloys are mainly Mg and Si, Mg2Si is the main strengthening phase, and the grain size is controlled mainly through two deformation operations of rolling and stretching. The prepared aluminum alloy billet has an internal structure with an average grain size of less than 200μm and uniform distribution, suitable hardness and tensile strength, can be applied to the field of liquid crystal panel display equipment, and has excellent performance.

[0014] As a preferred technical solution of the present invention, the size specification of the aluminum alloy raw material is (1700-1900)×(1300-1500)×(470-500) mm.

[0015] As a preferred technical solution of the present invention, the preheating temperature before rolling is 450-500°C, for example, 450°C, 460°C, 470°C, 480°C, 490°C or 500°C.

[0016] As a preferred technical solution of the present invention, the rolling passes are at least 3 times, and the pressing amount of each pass is controlled to be 10 to 40 mm, for example, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm or 40 mm.

[0017] As a preferred technical solution of the present invention, the number of rolling passes is 15 to 20 times, for example, 15 times, 16 times, 17 times, 18 times, 19 times or 20 times, and the pressing amount of each pass decreases with the number of passes.

[0018] As a preferred technical solution of the present invention, the total deformation rate of the rolling is 5-20%, for example, 5%, 7%, 10%, 12%, 15%, 18% or 20%.

[0019] As a preferred technical solution of the present invention, the temperature of the solution treatment is 530-560°C, for example, 530°C, 535°C, 540°C, 545°C, 550°C, 555°C or 560°C.

[0020] As a preferred technical solution of the present invention, the total deformation rate of the stretching is 2.5-3%, for example, 2.5%, 2.6%, 2.7%, 2.8%, 2.9% or 3%.

[0021] As a preferred technical solution of the present invention, the temperature of the aging treatment is 150-180°C, for example, 150°C, 155°C, 160°C, 165°C, 170°C, 175°C or 180°C.

[0022] A second object of the present invention is to provide an aluminum alloy billet for a liquid crystal panel display device, which is prepared by the preparation method described in the first object.

[0023] Compared with the prior art solutions, the present invention has at least the following beneficial effects:

[0024] The present invention provides an aluminum alloy billet for a liquid crystal panel display device and a preparation method thereof. The preparation method belongs to a deformation processing method, including rolling, solution treatment, stretching, and aging treatment performed in sequence. The obtained aluminum alloy billet has an internal structure with an average grain size of less than 200 μm and uniform distribution, suitable hardness and tensile strength, can be applied to the field of liquid crystal panel display devices, and has excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the preparation method of the present invention. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0027] The present invention provides a method for preparing an aluminum alloy blank for a liquid crystal panel display device, such as Figure 1 As shown, the preparation method comprises the following steps:

[0028] Prepare aluminum alloy raw materials; the mass composition of the aluminum alloy raw materials includes: Si 0.4-0.8%, Fe <0.7%, Cu 0.15-0.40%, Mn <0.15%, Mg 0.8-1.2%, Cr 0.04-0.35%, Zn <0.25%, Ti <0.15%, and the balance is Al;

[0029] The aluminum alloy raw material is sequentially subjected to rolling, solution treatment, stretching, and aging treatment to obtain an aluminum alloy billet for a liquid crystal panel display device.

[0030] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0031] In the embodiment of the present invention, the aluminum alloy raw material is obtained by smelting, purifying, casting and cutting the raw material purchased on the market. The mass composition of the aluminum alloy raw material is: Si 0.6%, Fe 0.5%, Cu 0.25%, Mn 0.08%, Mg 1.0%, Cr 0.23%, Zn 0.17%, Ti 0.07%, and the balance is Al and unavoidable impurities. The size of the aluminum alloy raw material is 1800×1400×485mm.

[0032] Example 1

[0033] This embodiment provides a method for preparing an aluminum alloy blank for a liquid crystal panel display device, the preparation method comprising the following steps:

[0034] (1) preparing the aforementioned aluminum alloy raw material, placing it in a resistance furnace and heating it to a temperature of 480° C., taking it out for rolling processing, and performing a total of 18 passes, controlling the pressing amount of each pass to be 10 to 40 mm, and the pressing amount of each pass decreases with the number of passes, and ensuring that the total deformation rate of rolling is 15%;

[0035] (2) placing the rolled aluminum alloy billet in a resistance furnace for solution treatment at a temperature of 550°C;

[0036] (3) The aluminum alloy billet after solution treatment is stretched to remove stress, and the total deformation rate of the stretching is 2.8%;

[0037] (4) The aluminum alloy blank after the stretching treatment is subjected to an aging treatment at a temperature of 160° C. to obtain an aluminum alloy blank for a liquid crystal panel display device, and an aluminum alloy target for a liquid crystal panel display device can be prepared according to a downstream process.

[0038] Example 2

[0039] This embodiment provides a method for preparing an aluminum alloy blank for a liquid crystal panel display device, the preparation method comprising the following steps:

[0040] (1) preparing the aforementioned aluminum alloy raw material, placing it in a resistance furnace and heating it to a temperature of 450° C., taking it out for rolling processing, and performing a total of 15 passes, controlling the pressing amount of each pass to be 10 to 40 mm, and the pressing amount of each pass decreases with the number of passes, and ensuring that the total deformation rate of rolling is 5%;

[0041] (2) placing the rolled aluminum alloy billet in a resistance furnace for solution treatment at a temperature of 530°C;

[0042] (3) The aluminum alloy billet after solution treatment is stretched to remove stress, and the total deformation rate of the stretching is 2.5%;

[0043] (4) The aluminum alloy blank after the stretching treatment is subjected to an aging treatment at a temperature of 150° C. to obtain an aluminum alloy blank for a liquid crystal panel display device, and an aluminum alloy target for a liquid crystal panel display device can be prepared according to a downstream process.

[0044] Example 3

[0045] This embodiment provides a method for preparing an aluminum alloy blank for a liquid crystal panel display device, the preparation method comprising the following steps:

[0046] (1) preparing the aforementioned aluminum alloy raw material, placing it in a resistance furnace and heating it to a temperature of 500° C., taking it out for rolling processing, and performing a total of 20 passes, controlling the pressing amount of each pass to be 10 to 40 mm, and the pressing amount of each pass decreases with the pass, and ensuring that the total deformation rate of rolling is 20%;

[0047] (2) placing the rolled aluminum alloy billet in a resistance furnace for solution treatment at a temperature of 560°C;

[0048] (3) The aluminum alloy billet after solid solution treatment is stretched to remove stress, and the total deformation rate of the stretching is 3%;

[0049] (4) The aluminum alloy blank after the stretching treatment is subjected to an aging treatment at a temperature of 180° C. to obtain an aluminum alloy blank for a liquid crystal panel display device, and an aluminum alloy target for a liquid crystal panel display device can be prepared according to a downstream process.

[0050] Example 4

[0051] This embodiment provides a method for preparing an aluminum alloy billet for a liquid crystal panel display device. Compared with Embodiment 1, the only difference is that the total deformation rate of rolling in step (1) is reduced from 15% to 3%.

[0052] Example 5

[0053] This embodiment provides a method for preparing an aluminum alloy billet for a liquid crystal panel display device. Compared with Embodiment 1, the only difference is that the total deformation rate of rolling in step (1) is increased from 15% to 23%.

[0054] Example 6

[0055] This embodiment provides a method for preparing an aluminum alloy billet for a liquid crystal panel display device. Compared with Embodiment 1, the only difference is that the total deformation rate of stretching in step (3) is reduced from 2.8% to 2%.

[0056] Example 7

[0057] This embodiment provides a method for preparing an aluminum alloy billet for a liquid crystal panel display device. Compared with Embodiment 1, the only difference is that the total deformation rate of stretching in step (3) is increased from 2.8% to 3.5%.

[0058] Example 8

[0059] This embodiment provides a method for preparing an aluminum alloy billet for a liquid crystal panel display device. Compared with Embodiment 1, the only difference is that the temperature of the aging treatment in step (4) is reduced from 160°C to 100°C.

[0060] Example 9

[0061] This embodiment provides a method for preparing an aluminum alloy billet for a liquid crystal panel display device. Compared with Embodiment 1, the only difference is that the temperature of the aging treatment in step (4) is increased from 160°C to 200°C.

[0062] Comparative Example 1

[0063] This comparative example provides a method for preparing an aluminum alloy billet. Compared with Example 1, the only difference is that the stretching described in step (3) is completely omitted.

[0064] The specific contents are as follows:

[0065] (1') preparing the aforementioned aluminum alloy raw material, placing it in a resistance furnace and heating it to a temperature of 480° C., taking it out for rolling processing, and performing a total of 18 passes, controlling the pressing amount of each pass to be 10 to 40 mm, and the pressing amount of each pass decreases with the number of passes, and ensuring that the total deformation rate of rolling is 15%;

[0066] (2') placing the rolled aluminum alloy billet in a resistance furnace for solution treatment at a temperature of 550°C;

[0067] (3') The aluminum alloy billet after the solution treatment is subjected to aging treatment at a temperature of 160° C. to obtain an aluminum alloy billet.

[0068] The aluminum alloy blanks prepared in the above examples and comparative examples were tested, and the specific test results are shown in Table 1.

[0069] Table 1

[0070] project Average grain size / μm Hardness / Hv Tensile strength / MPa Example 1 129.5 110.24 323.8 Example 2 130.7 111.65 319.7 Example 3 131.4 109.88 321.5 Example 4 140.2 112.41 301.4 Example 5 117.2 115.14 305.6 Example 6 120.3 99.85 300.5 Example 7 121.4 96.91 299.7 Example 8 112.4 100.21 304.2 Example 9 110.7 103.11 306.9 Comparative Example 1 150.8 108.99 310.9

[0071] It can be seen from Table 1 that:

[0072] (1) The present invention provides an aluminum alloy billet for a liquid crystal panel display device and a preparation method thereof. The preparation method belongs to a deformation processing method, including rolling, solution treatment, stretching, and aging treatment performed in sequence. The obtained aluminum alloy billet has an average internal grain size of less than 200 μm and is evenly distributed, preferably an average grain size of less than 140 μm, suitable hardness and tensile strength, preferably a hardness of 105-115 Hv, and preferably a tensile strength of 315-325 MPa. The billet can be applied to the field of liquid crystal panel display devices and has excellent performance.

[0073] (2) Comparing Example 1 with Example 4 and Example 5, since Example 4 reduces the total deformation rate of rolling in step (1) to 3%, the degree of deformation is reduced and the average grain size is increased. Since Example 5 increases the total deformation rate of rolling in step (1) to 23%, the tensile strength is significantly reduced.

[0074] (3) Comparing Example 1 with Example 6 and Example 7, Example 6 reduces the total deformation rate of stretching in step (3) to 2%, and Example 7 increases the total deformation rate of stretching in step (3) to 3.5%. Both lead to a decrease in the degree of deformation, and a significant decrease in hardness and tensile strength;

[0075] (4) Comparing Example 1 with Example 8 and Example 9, Example 8 reduces the temperature of the aging treatment in step (4) to 100°C, and Example 9 increases the temperature of the aging treatment in step (4) to 200°C. Both of them lead to a significant decrease in hardness and tensile strength;

[0076] (5) Comparing Example 1 with Comparative Example 1, since the stretching in step (3) is completely omitted in Comparative Example 1, a deformation operation that can control the grain size is omitted, resulting in a significant increase in the average grain size and a slight decrease in the tensile strength.

[0077] The present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the components selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0078] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0079] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0080] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for preparing an aluminum alloy blank for a liquid crystal panel display device, characterized in that: The preparation method comprises the following steps: Prepare aluminum alloy raw materials; the mass composition of the aluminum alloy raw materials includes: Si 0.4-0.8%, Fe <0.7%, Cu 0.15-0.40%, Mn <0.15%, Mg 0.8-1.2%, Cr 0.04-0.35%, Zn <0.25%, Ti <0.15%, and the balance is Al; The aluminum alloy raw material is sequentially subjected to rolling, solution treatment, stretching, and aging treatment to obtain an aluminum alloy billet for a liquid crystal panel display device.

2. The preparation method according to claim 1, characterized in that: The size specification of the aluminum alloy raw material is (1700-1900)×(1300-1500)×(470-500) mm.

3. The preparation method according to claim 1, characterized in that: The preheating temperature before the rolling is 450-500°C.

4. The preparation method according to claim 1, characterized in that: The rolling process is performed at least three times, and the pressing amount of each process is controlled to be 10 to 40 mm.

5. The preparation method according to claim 4, characterized in that: The number of rolling passes is 15 to 20, and the amount of downward pressure in each pass decreases with each pass.

6. The preparation method according to claim 1, characterized in that: The total deformation rate of the rolling is 5 to 20%.

7. The preparation method according to claim 1, characterized in that: The temperature of the solution treatment is 530-560°C.

8. The preparation method according to claim 1, characterized in that: The total deformation rate of the stretching is 2.5-3%.

9. The preparation method according to claim 1, characterized in that: The temperature of the aging treatment is 150-180°C.

10. An aluminum alloy blank for a liquid crystal panel display device, characterized in that: The preparation method is described in any one of claims 1 to 9.

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