Heat-bendable glass-ceramics and preparation method thereof

Abstract

The present invention discloses a heat-bendable microcrystalline glass and a preparation method thereof. First, glass material A and glass material B are prepared respectively using materials in different proportions. Then, the ratio of glass material A to glass material B is controlled within a certain range to prepare basic glass. The basic glass is crystallized, ground and polished to obtain heat-bendable microcrystalline glass. By adopting a two-step method to prepare the basic glass and strictly controlling the ratio of glass material A to glass material B, the temperature difference between the softening point and the crystallization peak temperature of the microcrystalline glass can be controlled within the range of 70°C-110°C, thereby expanding the adjustable temperature range during the heat bending process, improving the light transmittance of the heat-bend microcrystalline glass, avoiding the crystal phase transition or disappearance of the microcrystalline glass during the heat bending process, and avoiding unstable performance after the heat bending process. The method is suitable for the preparation of 2.5D-3D cover glass.

Description

Technical Field

[0001] The present invention relates to the technical field of microcrystalline glass, and in particular to a heat-bendable microcrystalline glass and a preparation method thereof. Background Art

[0002] With the advent of flexible AMOLED and 5G, 3D curved surfaces and glass materials have become standard features in mobile phones. Currently, mobile phone cases can be made of plastic, ceramic, glass, and metal. Plastic cases are limited to low-end phones and have been largely phased out. Ceramic back covers have low production volumes and are more expensive, making large-scale production and quality control their primary bottlenecks. Traditional metal cases, on the other hand, inherently block mobile phone signals. With the advent of 5G, wireless frequency bands will become increasingly complex, and signal requirements will become increasingly stringent. Mobile phone antennas are typically located on the back of the phone. Therefore, for signal protection, metal backs are often avoided, making glass the preferred option. Cover glass has evolved through a process from 2D to 2.5D and then to 3D. Unlike traditional glass cover processing, 2.5D-3D glass cover plates incorporate a thermal bending process. Thermally bent glass offers superior appearance and material quality, with advantages in heat dissipation, glossiness, and wear resistance. Furthermore, the curved design aligns with the curvature of the palm, making it more ergonomically compatible.

[0003] Glass-ceramics, also known as glass ceramics, are a composite material consisting of crystalline and glass phases, produced by nucleating and crystallizing glass. This unique structure distinguishes glass-ceramics from both glass and ceramics, with its properties determined by the composition and quantity of the crystalline and glass phases. Glass-ceramics are categorized as transparent and opaque, depending on their light transmittance. Transparent glass-ceramics, a type of glass-ceramic, exhibits excellent properties, namely transparency and low expansion, resulting in minimal volume changes with temperature fluctuations. It is a new functional material with excellent thermal, mechanical, optical, and chemical properties, and has found widespread application in various fields.

[0004] In the prior art, patent publication number CN115893851A discloses a glass-ceramic and its preparation method. Measured by mass, the glass-ceramic comprises 37% to 46% SiO2, 27% to 35% Al2O3, 12% to 20% Na2O, 0% to 5% K2O, 1% to 3% TiO2, 4% to 8% ZrO2, and 54% to 10% P2O. The glass-ceramic prepared using the mass percentages of the components in this scheme has high transmittance and mechanical properties, meeting the applicable requirements for cover glass. However, in the preparation of 2.5D-3D cover glass, hot bending is a critical step, which is accomplished by utilizing the softening point of the glass. For glass-ceramics with conventional compositions, the difference between the softening point and the crystallization temperature is small. Therefore, secondary crystallization is inevitable during hot bending of the glass-ceramic, affecting the transmittance and mechanical strength of the glass-ceramic, reducing its stability and hindering subsequent applications.

[0005] In view of this, it is necessary to design a heat-bendable microcrystalline glass and a preparation method thereof to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a heat-bendable microcrystalline glass and its preparation method that has high light transmittance and can avoid crystal phase transformation or disappearance during the heat bending process, as well as avoid unstable performance after the heat bending process, and is suitable for the preparation of 2.5D-3D cover glass.

[0007] To achieve the above-mentioned object of the invention, the present invention provides a heat-bendable micro-ceramic glass, wherein the base glass comprises a certain proportion of glass frit A and glass frit B, wherein the glass frit A comprises the following components: 65-75wt% SiO2, 4-8wt% Al2O3, 10-17wt% Li2O, 4-7wt% ZrO2, 3-5wt% P2O5, and 0-0.5wt% B2O3, and the glass frit B comprises the following components: 40-55wt% SiO2, 14-20wt% Al2O3, 0-2wt% Li2O, i2 O, 4~7wt% ZrO2, 0~3wt% P2O5, 2~6wt% K2O, 12~20wt% Na2O, 4~8wt% CaO, 0~0.5wt% B2O3, 0.2~2wt% BaO.

[0008] As a further improvement of the present invention, the mass ratio of the glass frit A to the glass frit B is (30-70):(70-30).

[0009] The present invention further provides a method for preparing heat-bendable glass-ceramics according to any one of the above technical solutions, comprising the following steps:

[0010] S1. Weigh the raw materials according to the composition of glass frit A, mix them well, add them into a crucible at 1500-1650°C, and keep them warm for 4-8 hours to obtain glass liquid A. Then, wet, dry, and sieve the raw materials to obtain glass frit A.

[0011] S2. Weigh raw materials according to the composition of glass frit B, mix them evenly, add them into a crucible at 1550-1680°C, and keep them warm for 6-10 hours to obtain glass liquid B. Then, wet, dry, and sieve the raw materials to obtain glass frit B.

[0012] S3. Weigh the glass frit A prepared in step S1 and the glass frit B prepared in step S2 in a mass ratio of (30-70):(70-30), mix them, and sieve them to obtain a mixture C. Add the mixture C into a crucible, keep it at a predetermined temperature for a predetermined time, and then stir and anneal it to obtain a base glass.

[0013] S4. The base glass prepared in step S3 is crystallized, ground, and polished to obtain heat-bendable micro-ceramic glass.

[0014] As a further improvement of the present invention, in step S3, the predetermined temperature is 1500-1600°C, and the holding time is 2-4 hours.

[0015] As a further improvement of the present invention, in step S3, the stirring operation is stirring at a speed of 4 to 12 rpm for 4 to 6 hours; the annealing operation is: pouring the stirred glass liquid into a mold at 400 to 420°C, and after the color of the glass darkens, placing the glass in an annealing furnace at 510 to 540°C, keeping it warm for 3 to 5 hours, and then uniformly cooling it to room temperature over 12 to 24 hours.

[0016] As a further improvement of the present invention, in step S4, the crystallization operation is: placing the base glass into a crystallization furnace, uniformly heating it to 520-540°C, keeping it warm for 1-2 hours, then uniformly heating it to 640-680°C, keeping it warm for 4-24 hours, and then uniformly cooling it to room temperature over 12-24 hours.

[0017] As a further improvement of the present invention, the particle size of the glass frit A and the glass frit B is greater than 1 mm.

[0018] As a further improvement of the present invention, in step S3, the sieve aperture used in the screening operation is 1 cm.

[0019] As a further improvement of the present invention, the heat-bendable microcrystalline glass prepared in step S4 is placed in a 2.5-3D mold, and subjected to heat bending treatment to obtain a heat-bent microcrystalline glass product.

[0020] As a further improvement of the present invention, the hot bending treatment operation is: placing a 2.5-3D mold containing heat-bendable microcrystalline glass into a heating furnace with nitrogen as the protective gas, heating it uniformly to 580-620°C over 1-3 hours, and then using the upper mold to press and shape it for 5-10 seconds; then keeping it at a temperature of 520-540°C for 10-30 minutes, and then cooling it uniformly to room temperature over 4-6 hours.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention prepares a crystallizable glass material A and a non-crystallizable glass material B by using materials in different proportions, and then controls the ratio of glass material A to glass material B within a certain range to prepare a base glass. The base glass is crystallized, ground, and polished to obtain a heat-bendable microcrystalline glass. By adopting a two-step method to prepare the base glass and strictly controlling the ratio of glass material A to glass material B, the temperature difference between the softening point and the crystallization peak temperature of the microcrystalline glass can be controlled within the range of 70°C-110°C, thereby expanding the adjustable temperature range during the heat bending process and improving the light transmittance of the heat-bent microcrystalline glass. Compared with conventional microcrystalline glass, the microcrystalline glass of the present invention can avoid the occurrence of crystal phase transformation or disappearance during the heat bending process, as well as avoid unstable performance after the heat bending process, and is suitable for the preparation of 2.5D-3D cover glass.

[0023] 2. The two-step preparation design of the basic glass of the present invention can obtain microcrystalline glass that meets different hot bending requirements by adjusting the ratio of glass material A and glass material B, quickly responding to 2.5D-3D preparation needs, and can flexibly adjust the opening and closing of the production line according to production tasks. The production process has high control accuracy and the glass utilization rate can reach more than 95%.

[0024] 3. The heat-bendable microcrystalline glass prepared by the preparation method of the present invention has a stable crystal phase, high dimensional accuracy, a smooth surface, and high glass transmittance. It can be widely used in aerospace technology, integrated circuit boards, solid lasers, infrared generators, infrared detection devices, high-temperature resistant cookers, high-temperature observation windows, and communication mobile terminal electronic equipment fields, and there is no need to add an external protective layer to improve the yield of heat-bent glass. At the same time, the preparation process of the present invention is simple, low-cost, and suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the differential thermal analysis result of the heat-bent glass-ceramics prepared in Example 1.

[0026] Figure 2 These are the expansion analysis results of the heat-bent glass-ceramics prepared in Example 1.

[0027] Figure 3This is the XRD test result of the heat-bent glass-ceramics prepared in Example 1.

[0028] Figure 4 These are the SEM test results of the heat-bent glass-ceramics prepared in Example 1.

[0029] Figure 5 This is the transmittance test result of the heat-bent microcrystalline glass prepared in Example 1. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0032] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0033] The present invention provides a heat-bendable microcrystalline glass, wherein the base glass includes glass frit A and glass frit B in a mass ratio of (30-70):(70-30), wherein the glass frit A includes the following components: 65-75wt% SiO2, 4-8wt% Al2O3, 10-17wt% Li2O, 4-7wt% ZrO2, 3-5wt% P2O5, and 0-0.5wt% B2O3, and the glass frit B includes the following components: 40-55wt% SiO2, 14-20wt% Al2O3, 0-2wt% Li2O, 4-7wt% ZrO2, 0-3wt% P2O5, 2-6wt% K2O, 12-20wt% Na2O, 4-8wt% CaO, 0-0.5wt% B2O3, and 0.2-2wt% BaO.

[0034] The present invention also provides a method for preparing heat-bendable glass-ceramics, comprising the following steps:

[0035] S1. Weigh raw materials according to the composition of glass frit A, mix them well, add them into a quartz crucible at 1500-1650°C, and keep them warm for 4-8 hours to obtain glass liquid A. Pour the glass liquid A into distilled water at room temperature, remove it, dry it, and sieve it to obtain glass frit A with a particle size greater than 1 mm;

[0036] S2. Weigh raw materials according to the composition of glass frit B, mix them well, add them into a quartz crucible at 1550-1680° C., and keep them warm for 6-10 hours to obtain glass liquid B. Pour the glass liquid B into distilled water at room temperature, remove it, dry it, and sieve it to obtain glass frit B with a particle size greater than 1 mm;

[0037] S3. Weigh the glass frit A prepared in step S1 and the glass frit B prepared in step S2 in a mass ratio of (30-70):(70-30), mix them, and sieve them three times through a sieve with a pore size of 1 cm to obtain a mixture C. Add the mixture C into a platinum crucible at 1500-1600° C., keep the temperature for 2-4 hours, and then stir and anneal to obtain a base glass.

[0038] S4. The base glass prepared in step S3 is crystallized, ground, and polished to obtain heat-bendable micro-ceramic glass.

[0039] Specifically, in step S3, the stirring operation is to stir at a speed of 4 to 12 rpm for 4 to 6 hours; the annealing operation is to pour the stirred glass liquid into a stainless steel mold at 400 to 420°C, and after the color of the glass darkens, place the glass in an annealing furnace at 510 to 540°C, keep it warm for 3 to 5 hours, and then cool it to room temperature at a uniform speed over 12 to 24 hours.

[0040] Specifically, in step S4, the crystallization operation is as follows: placing the base glass into a crystallization furnace, uniformly heating the glass from room temperature to 520-540°C over 4 hours, keeping the temperature for 1-2 hours, then uniformly heating the glass to 640-680°C over 2 hours, keeping the temperature for 4-24 hours, and then uniformly cooling the glass to room temperature over 12-24 hours.

[0041] Specifically, the grinding and polishing operations are: using diamond wire to cut the crystallized glass into glass sheets with a thickness of 0.2 to 10 mm, and then making flat crystallized glass sheets through rough grinding, fine grinding, polishing and other processes to obtain heat-bendable micro-ceramic glass.

[0042] Specifically, the heat-bendable microcrystalline glass prepared in step S4 is placed in a 2.5-3D mold, and then placed in a heating furnace with nitrogen as the protective gas. After 1 to 3 hours, the temperature is uniformly raised to 580 to 620°C, and then the upper mold is used to press and shape it for 5 to 10 seconds; at a temperature of 520-540°C, it is kept warm for 10 to 30 minutes, and then uniformly cooled to room temperature after 4 to 6 hours to obtain a heat-bent microcrystalline glass product.

[0043] The preparation method of the heat-bendable microcrystalline glass provided by the present invention is described below with reference to specific embodiments.

[0044] Example 1

[0045] This embodiment provides a method for preparing heat-bendable glass-ceramics, comprising the following steps:

[0046] S1. Weigh 72wt% SiO2, 6wt% Al2O3, 13wt% Li2O, 4.5wt% ZrO2, 4wt% P2O5, and 0.5wt% B2O3, mix them, and add them into a quartz crucible at 1600°C. Keep the mixture warm for 6 hours to obtain glass melt A. Pour the glass melt A into distilled water at room temperature, remove it, dry it, and sieve it to obtain glass frit A with a particle size greater than 1 mm.

[0047] S2. Weigh 48wt% SiO2, 16wt% Al2O3, 1wt% Li2O, 5.5wt% ZrO2, 2wt% P2O5, 4wt% K2O, 16wt% Na2O, 6wt% CaO, 0.5wt% B2O3, and 1wt% BaO, mix well, and add to a quartz crucible at 1550°C. Keep the temperature for 6 hours to obtain glass liquid B. Pour the glass liquid B into distilled water at room temperature, remove it, dry it, and sieve it to obtain glass material B with a particle size greater than 1mm.

[0048] S3. Weigh the glass frit A prepared in step S1 and the glass frit B prepared in step S2 in a mass ratio of 30:70, mix them, and sieve them three times through a 1 cm pore sieve to obtain a mixture C; add the mixture C into a platinum crucible at 1550° C., keep it warm for 3 hours, and stir it for 5 hours using a platinum stirring paddle at 4-12 rpm; pour the stirred glass liquid into a stainless steel mold at 410° C., and after the color of the glass darkens, place the glass in an annealing furnace at 530° C., keep it warm for 4 hours, and then cool it to room temperature at a uniform rate over 20 hours to obtain a base glass;

[0049] S4. Put the basic glass prepared in step S3 into a crystallization furnace, uniformly heat it from room temperature to 530°C over 4 hours, keep it warm for 2 hours, then uniformly heat it to 640°C over 2 hours, keep it warm for 4 hours, and then uniformly cool it to room temperature over 20 hours to obtain crystallized glass; then use diamond wire to cut the crystallized glass into glass sheets with a thickness of 5 mm, and make them into flat crystallized glass sheets through rough grinding, fine grinding, and polishing processes to obtain heat-bendable microcrystalline glass.

[0050] The prepared heat-bendable microcrystalline glass is placed in a 3D graphite mold, and then placed in a heating furnace with nitrogen as the protective gas. After 3 hours, the temperature is uniformly raised to 620°C, and then the upper mold is used to press and shape it for 10 seconds; finally, the 3D graphite mold is moved into a 530°C furnace, kept warm for 30 minutes, and then uniformly cooled to room temperature after 6 hours to obtain a heat-bent microcrystalline glass product.

[0051] Examples 2 to 6

[0052] Examples 2 to 6 respectively provide a method for preparing a heat-bendable microcrystalline glass. Compared with Example 1, the ratios of glass material A and glass material B in Examples 2-6 are adjusted to 35:65, 40:60, 45:55, 50:50, and 70:30, respectively. At the same time, according to the melting temperature requirements of the mixed materials in different proportions, the temperature of the platinum crucible in step S3 of Examples 2-6 is adjusted from 1550°C to 1560°C, 1570°C, 1580°C, 1590°C and 1600°C, respectively. The remaining steps are consistent with Example 1 and are not repeated here.

[0053] Comparative Examples 1 to 3

[0054] Comparative Examples 1-3 each provide a method for preparing a heat-bendable glass-ceramic. Compared with Example 1, Comparative Example 1 adjusts the two-step method for preparing the base glass in Example 1 to a one-step method, that is, directly using the same raw materials as in Example 1 to prepare the glass-ceramic. The specific operation is as follows: the raw materials of glass frit A and glass frit B are weighed in proportion, and mixed in a mass ratio of 30:70 to obtain a mixture C. The subsequent steps are consistent with Example 1.

[0055] In Comparative Examples 2-3, the ratios of glass frit A and glass frit B were adjusted to 20:80 and 80:20, respectively. The remaining steps were the same as those in Example 1 and are not described again.

[0056] The heat-bendable glass-ceramics prepared in Examples 2-6 and Comparative Examples 1-3 were respectively used to prepare heat-bendable glass-ceramics products using the same method as in Example 1.

[0057] The relevant properties of the heat-bent glass-ceramics of Examples 1-6 and Comparative Examples 1-3 were tested, and the results are shown in Table 1; wherein, the differential thermal analysis curve, expansion curve, X-ray diffractometer test results, scanning electron microscope test results and transmittance test results of the heat-bent glass-ceramics of Example 1 are shown in Table 1. Figure 1-Figure 5 shown.

[0058] Table 1 Test results of relevant properties of heat-bent glass-ceramics products of Examples 1-6 and Comparative Examples 1-3

[0059]

[0060] The density of the heat-bent glass-ceramics of Example 1 obtained by the Archimedean method is 3.12 g / cm 3 .Depend on Figure 1 It can be seen that the crystallization peak temperature of the heat-bent glass-ceramics of Example 1 obtained by differential heating is 640°C; the softening point temperature obtained by thermal expansion is 560°C, and the linear expansion coefficient α is 7.82×10 -6 / ℃(50~450℃)( Figure 2); The crystallinity of the heat-bent glass-ceramics was 86.5% and the grain size was 2.1 nm ( Figure 3 ); The crystals in the heat-bent glass-ceramics were observed by JMS-5610LV scanning electron microscope to be 1-10 nm spherical or quasi-spherical and evenly distributed ( Figure 4 ).like Figure 5 As shown, the transmittance of the heat-bent glass-ceramics prepared in Example 1 in the visible light range tested by a GD751 spectrophotometer is greater than 90.8% (thickness 0.68 mm, after 550 nm). It can be seen that the adjustable temperature range between the softening point temperature and the crystallization peak temperature of the heat-bent glass-ceramics prepared in Example 1 is 80°C, and the heat-bendable glass-ceramics prepared by the preparation method of the present invention is suitable for heat bending treatment, and the heat-bent glass-ceramics obtained after heat bending treatment has a stable crystal phase, high dimensional accuracy, a smooth surface, and high crystallinity and transmittance.

[0061] It can be seen from Table 1 that when the ratio of glass material A and glass material B increases from 30:70 to 70:30, the temperature difference between the softening point temperature and the crystallization peak temperature of the heat-bent microcrystalline glass prepared in Examples 1-6 increases from 80°C to 110°C. At the same time, the transmittance is greater than 90%, the crystallinity is greater than or equal to 76%, and the crystals in the heat-bent microcrystalline glass observed by the JMS-5610LV scanning electron microscope are uniformly distributed, and are 1-10nm spherical or quasi-spherical, indicating that the heat-bendable microcrystalline glass prepared according to the preparation method of the present invention is suitable for heat bending treatment, and still has good performance after heat bending treatment.

[0062] Compared with Example 1, the temperature difference between the softening point temperature and the crystallization peak temperature of the heat-bent microcrystalline glass prepared in Comparative Example 1 is reduced to 23°C. At the same time, the grain size is increased, the linear expansion coefficient is reduced, and the transmittance is significantly reduced to only 37%, indicating that the stability of the heat-bendable microcrystalline glass prepared according to Comparative Example 1 will be significantly reduced after heat bending treatment.

[0063] In addition, when the proportion of glass material A is too low, the crystals of the heat-bendable microcrystalline glass will increase, resulting in a low polishing rate and poor transmittance (Comparative Example 2); when the proportion of glass material A is high, it will affect the degree of crystallization of the heat-bendable microcrystalline glass, resulting in a low crystallization degree, and thus unable to meet the performance requirements of 2.5-3D cover glass (Comparative Example 3).

[0064] In summary, the present invention discloses a heat-bendable microcrystalline glass and a preparation method thereof. By adopting a two-step method to prepare the basic glass and strictly controlling the ratio of glass material A and glass material B, the temperature difference between the softening point and the crystallization peak temperature of the microcrystalline glass can be controlled within the range of 70°C-110°C, thereby expanding the controllable temperature range during the heat bending process and improving the transmittance of the heat-bent microcrystalline glass. At the same time, it avoids the occurrence of crystal phase transformation or disappearance during the heat bending process, as well as the occurrence of unstable performance after the heat bending process. It is suitable for the preparation of 2.5D-3D cover glass. The heat-bendable microcrystalline glass prepared by the preparation method of the present invention has a stable crystal phase, high dimensional accuracy, a smooth surface, and high glass transmittance. It can be widely used in aerospace technology, integrated circuit boards, solid lasers, infrared generators, infrared detection devices, high-temperature resistant cookers, high-temperature observation windows, and communication mobile terminal electronic equipment. At the same time, the preparation process of the present invention is simple and low-cost, and there is no need to increase the yield of heat-bent glass by adding an external protective layer, so it is suitable for industrial production.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A heat-bendable glass-ceramic, characterized by: The base glass includes a certain proportion of glass frit A and glass frit B, wherein the glass frit A includes the following components: 65-75 wt% SiO2, 4-8 wt% Al2O3, 10-17 wt% Li2O, 4-7 wt% ZrO2, 3-5 wt% P2O5, and 0-0.5 wt% B2O3; the glass frit B includes the following components: 40-55 wt% SiO2, 14-20 wt% Al2O3, 0-2 wt% Li2O, 4-7 wt% ZrO2, 0-3 wt% P2O5, 2-6 wt% K2O, 12-20 wt% Na2O, 4-8 wt% CaO, 0-0.5 wt% B2O3, and 0.2-2 wt% BaO; the mass ratio of the glass frit A to the glass frit B is (30-70): (70-30).

2. A method for preparing the heat-bendable glass-ceramics according to claim 1, characterized in that: The steps include: S1. Weigh the raw materials according to the composition of glass frit A, mix them well, add them into a crucible at 1500-1650°C, and keep them warm for 4-8 hours to obtain glass liquid A. Then, perform infiltration, drying, and sieving to obtain glass frit A. S2. Weigh raw materials according to the composition of glass frit B, mix them evenly, add them into a crucible at 1550-1680°C, and keep them warm for 6-10 hours to obtain glass liquid B. Then, perform infiltration, drying, and sieving to obtain glass frit B; S3. Weigh the glass frit A prepared in step S1 and the glass frit B prepared in step S2 in a mass ratio of (30-70): (70-30), mix them, and sieve them to obtain a mixture C. Add the mixture C into a crucible, keep it at a predetermined temperature for a predetermined time, and then stir and anneal it to obtain a base glass. S4. The base glass prepared in step S3 is crystallized, ground, and polished to obtain heat-bendable micro-ceramic glass.

3. The method for preparing heat-bendable glass-ceramics according to claim 2, wherein: In step S3, the predetermined temperature is 1500-1600° C., and the holding time is 2-4 hours.

4. The method for preparing heat-bendable glass-ceramics according to claim 3, wherein: In step S3, the stirring operation is performed at a speed of 4 to 12 rpm for 4 to 6 hours. The annealing operation is performed by pouring the stirred glass liquid into a mold at 400 to 420°C. After the color of the glass darkens, the glass is placed in an annealing furnace at 510 to 540°C, kept at this temperature for 3 to 5 hours, and then uniformly cooled to room temperature over 12 to 24 hours.

5. The method for preparing heat-bendable glass-ceramics according to claim 2, wherein: In step S4, the crystallization operation is as follows: placing the base glass in a crystallization furnace, uniformly heating it to 520-540°C, keeping it warm for 1-2 hours, then uniformly heating it to 640-680°C, keeping it warm for 4-24 hours, and then uniformly cooling it to room temperature over 12-24 hours.

6. The method for preparing heat-bendable glass-ceramics according to claim 2, wherein: The particle sizes of the glass frit A and the glass frit B are greater than 1 mm.

7. The method for preparing heat-bendable glass-ceramics according to claim 2, wherein: In step S3, the sieve used in the screening operation has an aperture of 1 cm.

8. The method for preparing heat-bendable glass-ceramics according to claim 2, wherein: The heat-bendable microcrystalline glass prepared in step S4 is placed in a 2.5-3D mold, and a heat-bent microcrystalline glass product is obtained by heat bending treatment.

9. The method for preparing heat-bendable glass-ceramics according to claim 8, wherein: The hot bending treatment operation is as follows: placing a 2.5-3D mold containing bendable microcrystalline glass into a heating furnace with nitrogen as the protective gas, uniformly heating it to 580-620°C over 1-3 hours, and then using the upper mold to press and shape it for 5-10 seconds; then keeping it at 520-540°C for 10-30 minutes, and then uniformly cooling it to room temperature over 4-6 hours.

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