Glass-ceramic material, preparation method therefor, and application thereof

Abstract

The present invention provides a glass-ceramic material, a preparation method therefor, and an application thereof. The glass-ceramic material comprises at least two regions having different light transmittances; for any two adjacent regions with different light transmittances, the region with a smaller light transmittance is a low light transmittance region, and the region with a larger light transmittance is a high light transmittance region; a gradient region exists between the low light transmittance region and the high light transmittance region, the gradient region having a light transmittance between the light transmittance of the high light transmittance region and the light transmittance of the low light transmittance region, and the light transmittance of the gradient region exhibiting an increasing trend in a direction from the low light transmittance region to the high light transmittance region. The present invention achieves a non-uniform light transmittance effect in glass-ceramic material.

Description

Microcrystalline glass material, preparation method and application thereof

[0001] The present application claims priority to the Chinese patent application No. 202410726364.1, filed on June 5, 2024, and entitled "Microcrystalline glass material, preparation method and application thereof", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of microcrystalline glass materials, in particular to a microcrystalline glass material, a preparation method and application thereof. BACKGROUND

[0003] For glass materials, they are usually colorless transparent or pure color glass (such as green glass, yellow glass, etc.), and most of the structural parts of existing glass materials (such as mobile phone battery cover, lens, wearable shell and other shell components) adopt colorless transparent glass substrates, and then display different appearances and color effects through film pasting or film plating process, but this will increase the preparation complexity of glass material structural parts, and the actual application is limited. Directly making the glass material present non-uniform light transmittance and other characteristics can avoid film pasting or film plating treatment on the surface of the glass material, and more appearance effects can be designed compared with the existing glass material, so it can be a direction to improve the differentiation competitiveness of glass materials. Therefore, how to develop a glass material that can present non-uniform light transmittance and other characteristics is an important issue faced by those skilled in the art. SUMMARY

[0004] The present application provides a microcrystalline glass material, a preparation method and application thereof, which has non-uniform light transmittance and can be used in appearance structural parts and other products, realizing rich appearance effects of these products and effectively overcoming the defects of the prior art.

[0005] In one aspect of the present application, a microcrystalline glass material is provided, comprising at least two regions with different light transmittance; wherein for any two adjacent regions with different light transmittance, the one with smaller light transmittance is a low light transmittance region, and the one with larger light transmittance is a high light transmittance region, there is a gradual change region between the low light transmittance region and the high light transmittance region, the light transmittance of the gradual change region is between the light transmittance of the high light transmittance region and the light transmittance of the low light transmittance region, and the light transmittance of the gradual change region shows an increasing trend along the direction from the low light transmittance region to the high light transmittance region.

[0006] According to one embodiment of the present application, the difference between the light transmittance of the high light transmittance region and the light transmittance of the low light transmittance region is greater than or equal to 10%.

[0007] According to one embodiment of the present application, one or more of the crystallinity, crystal size and crystal type composition of the low light transmittance region and the high light transmittance region are different.

[0008] According to an embodiment of the present application, the difference between the crystallinity of the low light transmittance region and the crystallinity of the high light transmittance region is 3% to 80%; and / or, the difference between the crystal grain size of the low light transmittance region and the crystal grain size of the high light transmittance region is 10 to 500 nm.

[0009] According to an embodiment of the present application, the width of the gradient region in the direction from the low light transmittance region to the high light transmittance region is greater than or equal to 0.5 mm.

[0010] According to an embodiment of the present application, the glass-ceramic material is formed by heat treating at least a portion of the glass-ceramic substrate, wherein the at least two regions with different light transmittance are formed by the heat treating of at least a portion of the glass-ceramic substrate.

[0011] According to an embodiment of the present application, in the region subjected to the heat treatment, the glass-ceramic material is different from the glass-ceramic substrate in one or more of the following: crystallinity, crystal grain size, and crystal type composition.

[0012] According to another aspect of the present application, a method for preparing the above glass-ceramic material is provided, comprising the following steps: heat treating at least a portion of the glass-ceramic substrate, and forming the at least two regions with different light transmittance after the heat treatment, to obtain the glass-ceramic material.

[0013] According to an embodiment of the present application, the heat treatment is performed by using a heating device, wherein the heating device comprises at least two heating zones, the at least two heating zones correspond to the at least two regions with different light transmittance one by one, and the heating temperature of each two of the heating zones is different during the heat treatment, so as to heat treat the at least two regions of the glass-ceramic substrate at different temperatures, to form the at least two regions with different light transmittance, and to obtain the glass-ceramic material.

[0014] According to an embodiment of the present application, the heating device comprises a heating plate and a mold, the mold comprises clamping plates located on opposite sides of the glass-ceramic substrate, and the side of each of the clamping plates away from the glass-ceramic substrate is provided with the heating plate; during the heat treatment, the clamping plates are heated by the heating plates, and then the glass-ceramic substrate is heated by the clamping plates, so as to heat treat at least a portion of the glass-ceramic substrate.

[0015] According to an embodiment of the present application, one or more of the following conditions is different in any two of the heating zones: the thermal conductivity of the clamping plate, the material of the clamping plate, the thickness of the clamping plate, the distance between the clamping plate and the heating plate, and the heating power of the heating plate, so as to achieve different heating temperatures of the microcrystalline glass substrate in each of the two heating zones.

[0016] According to an embodiment of the present application, for any two of the heating zones, one of the heating zones is a first heating zone and the other of the heating zones is a second heating zone, the clamping plate in the first heating zone is connected to the clamping plate in the second heating zone, and the thermal conductivity of the clamping plate in the first heating zone is different from the thermal conductivity of the clamping plate in the second heating zone; and / or, for any two adjacent heating zones, one of the heating zones is a first heating zone and the other of the heating zones is a second heating zone; the clamping plate comprises a first sub-clamping plate and a second sub-clamping plate, the first sub-clamping plate comprises a main body part located in the first heating zone and an extension part located in the second heating zone, the main body part is connected to the extension part, and the main body part is in contact with the heating plate, the second sub-clamping plate is located in the second heating zone, and the second sub-clamping plate is located between the extension part and the heating plate; and / or, for any two of the heating zones, the clamping plate in the heating zone with a higher temperature is in direct contact with the heating plate, and the clamping plate in the heating zone with a lower temperature is spaced apart from the heating plate; and / or, the thermal conductivity of the clamping plate in at least one of the heating zones is 50-2000 w / (m-k); and / or, the thermal conductivity of the clamping plate in at least one of the heating zones is 0.01-30 w / (m-k).

[0017] According to an embodiment of the present application, the material of the clamping plate comprises one or more of graphite, ceramic, and metal.

[0018] According to an embodiment of the present application, the crystals in the microcrystalline glass substrate comprise one or more of petalite, spinel, lithium phosphate, monosilicate, disilicate, aluminum phosphate, aluminum metaphosphate, zirconium silicate, quartz, and quartz solid solution; and / or, the average grain size of the crystals in the microcrystalline glass substrate is 5-100 nm; and / or, the microcrystalline glass substrate has uniform light transmittance; and / or, the crystallinity of the microcrystalline glass substrate is 30%-95%; and / or, the microcrystalline glass substrate comprises the following components in terms of mole fraction: Li2O: 10%-25%; SiO2: 58%-72%; Na2O+K2O: 3%-7%; Al2O3: 2%-8%; P2O5+ZrO2+TiO2: 2%-13%; MgO+CaO+ZnO: 0-3%; B2O3: 0-5%.

[0019] In another aspect of the present application, a heating device is provided for preparing the glass-ceramic material or for implementing the method for preparing the glass-ceramic material, the heating device comprising: a mold comprising two clamping plates for clamping the glass-ceramic substrate, and for heat treating at least a portion of the glass-ceramic substrate through the clamping plates to obtain the glass-ceramic material having at least two regions with different light transmittances; and a heating plate for heating the clamping plates and for heating at least a portion of the glass-ceramic substrate through the clamping plates to achieve the heat treatment of at least a portion of the glass-ceramic substrate through the clamping plates to obtain the glass-ceramic material; wherein during the heat treatment of at least a portion of the glass-ceramic substrate, each of the clamping plates has the heating plate on the side away from the glass-ceramic substrate.

[0020] According to an embodiment of the present application, the heating device comprises at least two heating zones, and one or more of the following conditions of the clamping plates and the heating plates in any two of the heating zones are different: the thermal conductivity of the clamping plates, the material of the clamping plates, the thickness of the clamping plates, the distance between the clamping plates and the heating plates, and the heating power of the heating plates, so as to achieve different heating temperatures of the glass-ceramic substrate in any two of the heating zones during the heat treatment, and to achieve different temperature heat treatments of at least two regions of the glass-ceramic substrate to obtain the glass-ceramic material.

[0021] According to an embodiment of the present application, for any two adjacent heating zones, one of the heating zones is a first heating zone and the other of the heating zones is a second heating zone, the clamping plates in the first heating zone are connected to the clamping plates in the second heating zone, and the clamping plates in the first heating zone have different thermal conductivities from the clamping plates in the second heating zone; and / or, for any two adjacent heating zones, one of the heating zones is a first heating zone and the other of the heating zones is a second heating zone; the clamping plates comprise a first sub-clamping plate and a second sub-clamping plate, the first sub-clamping plate comprises a main body part in the first heating zone and an extension part in the second heating zone, the main body part is connected to the extension part, the second sub-clamping plate is located in the second heating zone and between the extension part and the heating plate; and / or, for any two of the heating zones, the clamping plates in the heating zone with a higher temperature are in direct contact with the heating plates, and the clamping plates in the heating zone with a lower temperature have a gap between the clamping plates and the heating plates; and / or, the clamping plates in at least one of the heating zones have a thermal conductivity of 50-2000 w / (m-k); and / or, the clamping plates in at least one of the heating zones have a thermal conductivity of 0.01-30 w / (m-k).

[0022] According to an embodiment of the present application, the material of the clamping plate comprises one or more of graphite, ceramic and metal.

[0023] According to another aspect of the present application, a structural member is provided, comprising the microcrystalline glass material.

[0024] According to another aspect of the present application, a terminal product is provided, comprising the structural member.

[0025] The microcrystalline glass material, the preparation method and the application thereof provided by the present application have at least two regions with different light transmittance, and a gradual change region exists between two adjacent regions with different light transmittance, so that the microcrystalline glass presents the characteristic of non-uniform light transmittance, and can be used in appearance structural members and other products, to realize the rich appearance effect of these products and improve the differentiated competitiveness of these products, and at the same time, the film pasting or film plating treatment on the surface of the glass material can be avoided, thereby the preparation process of the appearance structural members and other products formed by the glass material can be simplified, the cost is reduced, and it has important significance for practical industrial application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a structural schematic diagram of a heating device according to an embodiment of the present application;

[0027] Fig. 2 is a structural schematic diagram of a heating device according to another embodiment of the present application;

[0028] Fig. 3 is a structural schematic diagram of a heating device according to another embodiment of the present application;

[0029] Fig. 4 is a structural schematic diagram of a microcrystalline glass material according to an embodiment of the present application;

[0030] Fig. 5 is a structural schematic diagram of a microcrystalline glass material according to another embodiment of the present application.

[0031] Fig. 1 is a structural schematic diagram of a heating device according to an embodiment of the present application; DETAILED DESCRIPTION

[0032] In order for those skilled in the art to better understand the scheme of the present application, the present application is further described in detail below. The following specific embodiments are only used to describe the principles and characteristics of the present application, and the examples are only used to explain the present application, but not to limit the scope of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] The embodiment of the present application provides a kind of glass-ceramic material, as shown in Figure 4 and Figure 5, the glass-ceramic material includes at least two regions of different light transmittance;Wherein, for any two adjacent regions of different light transmittance, the one with smaller light transmittance is low light transmittance area 101, the one with larger light transmittance is high light transmittance area 102, there is gradual change area 103 between low light transmittance area 101 and high light transmittance area 102, the light transmittance of gradual change area 103 is between the light transmittance of high light transmittance area 102 and the light transmittance of low light transmittance area 101 (that is, the light transmittance of gradual change area 103 is not higher than the light transmittance of high light transmittance area 102, and not lower than the light transmittance of low light transmittance area 101), and the light transmittance of gradual change area 103 increases along the direction from low light transmittance area 101 to high light transmittance area 102.

[0034] For example, as shown in Figure 4 and Figure 5, the glass-ceramic material includes two regions of different light transmittance, and gradual change area 103 between the two regions of different light transmittance.

[0035] In the embodiment of the present application, the glass-ceramic material is integrally formed, rather than being formed by splicing different glass-ceramics, that is, for any two adjacent regions of different light transmittance, low light transmittance area 101, high light transmittance area 102, and gradual change area 103 between low light transmittance area 101 and high light transmittance area 102 are integrally formed, rather than being formed by splicing glass-ceramics with low light transmittance, glass-ceramics with gradually changing light transmittance, and glass-ceramics with high light transmittance.

[0036] Specifically, the glass-ceramic material is formed by heat treating at least part of the glass-ceramic substrate 1, wherein at least two regions of different light transmittance are formed by heat treating at least part of the glass-ceramic substrate 1 to obtain the glass-ceramic material.

[0037] Specifically, the glass-ceramic substrate 1 used and the glass-ceramic obtained after heat treating the glass-ceramic substrate 1 are both glass-ceramics, which include glass phase and crystal phase, and by heat treating at least part of the glass-ceramic substrate 1, the grain size (crystal particle size), crystallinity, etc. of these regions can be controlled to exhibit different light transmittance.

[0038] Generally, in the region subjected to heat treatment, the glass-ceramic material is different from the glass-ceramic substrate 1 in one or more of the following aspects: crystallinity, crystal particle size, and crystal type composition.

[0039] Specifically, during heat treatment, the grain size of the region of the glass-ceramic substrate 1 subjected to heat treatment will grow, the crystallinity will increase, and at the same time, the crystal type (crystal form) composition will also change to some extent, for example, at least one original crystal will change into other crystal type, and at least one new crystal type will be generated, etc.

[0040] In addition, for any two adjacent regions with different transmittances, one or more of the crystallinity, the crystal grain size, and the crystal type composition of the low-transmittance region 101 and the high-transmittance region 102 are different.

[0041] Specifically, in the process of heat treating at least part of the regions of the glass-ceramic substrate 1, the higher the heat treatment temperature of a region of the glass-ceramic substrate 1, the larger the grain size, the higher the crystallinity, and the lower the transmittance of the region, so that the glass-ceramic material can be prepared by heat treating at least two regions of the glass-ceramic substrate 1 at different temperatures to make the transmittances of the at least two regions different, thereby obtaining at least two regions with different transmittances. Meanwhile, when heat treating at least part of the regions of the glass-ceramic substrate 1, different heat treatment temperatures usually also result in different crystal type compositions.

[0042] It should be noted that the crystal type composition of the low-transmittance region 101 and the high-transmittance region 102 being different means that the type of at least one crystal in the low-transmittance region 101 is different from the type of at least one crystal in the high-transmittance region 102. When the low-transmittance region 101 contains multiple crystals and / or the high-transmittance region 102 contains multiple crystals, at least part of the crystal types of the low-transmittance region 101 and the high-transmittance region 102 are different, and the low-transmittance region 101 and the high-transmittance region 102 can or can not contain the same crystal.

[0043] In some preferred embodiments, the crystals (glass-ceramic phases) in the glass-ceramic material can include one or more of petalite, spinel, lithium phosphate, lithium monosilicate, lithium disilicate, aluminum phosphate, aluminum metaphosphate, zirconium silicate, quartz, and quartz solid solution.

[0044] In some embodiments, the glass-ceramic material can include the following components in the following molar fractions (molar percentages): Li2O: 10% to 25%; SiO2: 58% to 72%; Na2O + K2O: 3% to 7% (i.e., the sum of the molar fractions of Na2O and K2O is 3% to 7%); Al2O3: 2% to 8%; P2O5 + ZrO2 + TiO2: 2% to 13% (i.e., the sum of the molar fractions of P2O5, ZrO2, and TiO2 is 2% to 13%); MgO + CaO + ZnO: 0 to 3% (i.e., the sum of the molar fractions of MgO, CaO, and ZnO is 0 to 3%); and B2O3: 0 to 5%.

[0045] Specifically, for any two adjacent regions with different transmittances, the difference between the transmittance of the high-transmittance region 102 and the transmittance of the low-transmittance region 101 can be greater than or equal to 10%, such as 10%, 20%, 30%, 40%, 50%, 60%, 70%, or a range formed by any two of them, which is conducive to the effect of the glass-ceramic material presenting a non-uniform transmittance.

[0046] Specifically, for any two adjacent regions with different light transmittances, the difference between the crystallinity of the low light transmittance region 101 and the crystallinity of the high light transmittance region 102 can be 3% to 80%, for example, 3%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 60%, 70%, 80%, or a range consisting of any two of them.

[0047] Specifically, for any two adjacent regions with different light transmittances, the difference between the crystal grain size of the low light transmittance region 101 and the crystal grain size of the high light transmittance region 102 can be 10 to 500 nm, for example, 10 nm, 30 nm, 50 nm, 80 nm, 100 nm, 130 nm, 150 nm, 180 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, or a range consisting of any two of them.

[0048] In the embodiments of the present application, the crystal grain size of each region is the average crystal grain size of the region, and the light transmittance of each region is the average light transmittance of the region. The light transmittance refers to the visible light transmittance, which can be measured by conventional methods in the art, and is not particularly limited.

[0049] In addition, in the embodiments of the present application, the width of the gradient region 103 in the direction from the low light transmittance region 101 to the high light transmittance region 102 can be greater than or equal to 0.5 mm, and further can be greater than or equal to 1 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 1 cm, 1.5 cm, 2 cm, or a range consisting of any two of them.

[0050] In the embodiments of the present application, the microcrystalline glass material can be flat (i.e., the microcrystalline glass material can be a sheet-shaped microcrystalline glass (or flat sheet microcrystalline glass, 2D microcrystalline glass)), or have a bending structure (i.e., the microcrystalline glass material can be a microcrystalline glass with a bending structure (or 3D microcrystalline glass)), or other regular or irregular shaped microcrystalline glass.

[0051] The embodiments of the present application also provide a preparation method of the above-mentioned microcrystalline glass material, comprising the following steps: heat treating at least part of the regions of the microcrystalline glass substrate 1, and forming at least two regions with different light transmittances after heat treatment to obtain the microcrystalline glass material.

[0052] The preparation method of the microcrystalline glass material of the embodiment of the present application is a microcrystalline glass non-uniform light transmittance process. Through the preparation process, the microcrystalline glass material with at least two regions with different light transmittances can be prepared, the non-uniform light transmittance effect of the microcrystalline glass material is realized, the non-uniform light transmittance effect of the microcrystalline glass material is controllable, more ID appearances can be designed, the appearance structure parts and other products formed by using the microcrystalline glass material can present more rich visual effects, the differentiation design of the products is realized, meanwhile, the mass production of the microcrystalline glass material can be realized, which has important significance for the actual industrial application.

[0053] Generally, the at least partial region of the microcrystalline glass substrate 1 is heat treated, and at least two regions with different light transmittances are formed after heat treatment. Specifically, the at least two regions of the microcrystalline glass can be heat treated at different temperatures to make the light transmittances of the at least two regions different, so that at least two regions with different light transmittances are obtained, and the microcrystalline glass material is prepared.

[0054] Specifically, as shown in FIGS. 1 to 3, the heating device can be used for heat treatment, and the heating device includes a heating plate and a mold. During the heat treatment of the at least partial region of the microcrystalline glass substrate 1, the mold is heated by the heating plate, and then the at least partial region of the microcrystalline glass substrate 1 is heated by the mold, so as to realize the heat treatment of the at least partial region of the microcrystalline glass substrate 1.

[0055] Specifically, as shown in FIGS. 1 to 3, the mold includes clamps located on opposite sides of the microcrystalline glass substrate 1 (hereinafter, the clamp located on one side of the microcrystalline glass substrate 1 is referred to as a first clamp 21, and the clamp located on the other side of the microcrystalline glass substrate 1 is referred to as a second clamp 22), and the clamps located on opposite sides of the microcrystalline glass substrate 1 are respectively provided with heating plates on the sides away from the microcrystalline glass substrate 1, that is, the first clamp 21 is provided with a heating plate (hereinafter referred to as a first heating plate 31) on the side away from the microcrystalline glass substrate 1, and the second clamp 22 is provided with a heating plate (hereinafter referred to as a second heating plate 32) on the side away from the microcrystalline glass substrate 1. During the heat treatment, the microcrystalline glass substrate 1 is located between the first clamp 21 and the second clamp 22, the first heating plate 31 is located on the side of the first clamp 21 away from the microcrystalline glass substrate 1, and the second heating plate 32 is located on the side of the second clamp 22 away from the microcrystalline glass substrate 1. The first clamp 21 is heated by the first heating plate 31, the second clamp 22 is heated by the second heating plate 32, and then the at least partial region of the microcrystalline glass substrate 1 is heated by the first clamp 21 and the second clamp 22, so as to realize the heat treatment of the at least partial region of the microcrystalline glass substrate 1.

[0056] Generally, as shown in FIGS. 1-3, during the heat treatment process, the clamping plates are in direct contact with the glass-ceramic substrate 1, i.e., the first clamping plate 21 is in direct contact with one side surface of the glass-ceramic substrate 1, and the second clamping plate 22 is in direct contact with the other side surface of the glass-ceramic substrate 1, and the glass-ceramic substrate 1 is clamped between the first clamping plate 21 and the second clamping plate 22.

[0057] In the embodiment of the present application, the light transmittance (color) of the different light transmittance regions of the glass-ceramic material can be achieved by heat treating the glass-ceramic substrate 1 at different temperatures. The higher the heating temperature (heat treatment temperature) of a region, the lower the light transmittance of the region. The different light transmittances of different regions can be achieved by using different mold materials (clamping plate materials, clamping plate materials), different mold shapes (clamping plate shapes), or by heating the predetermined positions of the glass-ceramic substrate 1, and the glass-ceramic material is prepared.

[0058] With reference to FIGS. 1-3, the heating device can include at least two heating zones corresponding to the at least two regions with different light transmittances, i.e., one heating zone corresponds to one region with a certain light transmittance. During the heat treatment process, the heating temperatures of the two heating zones are different to heat treat the at least two regions of the glass-ceramic substrate 1 at different temperatures, form at least two regions with different light transmittances, and prepare the glass-ceramic material.

[0059] Specifically, the temperatures of the clamping plates in each of the two heating zones are different (i.e., the temperatures of the first clamping plates 21 in the two heating zones are different, and the temperatures of the second clamping plates 22 in the two heating zones are different), so that the heating temperatures of the two heating zones are different. In each heating zone, the temperatures of the first clamping plates 21 and the second clamping plates 22 on opposite sides of the glass-ceramic substrate 1 are substantially the same.

[0060] Specifically, as shown in FIGS. 1-3, for each two adjacent heating zones, the clamping plates in one heating zone are connected to the clamping plates in the other heating zone, specifically, the first clamping plates 21 in one heating zone are connected to the first clamping plates 21 in the other heating zone, and the second clamping plates 22 in one heating zone are connected to the second clamping plates 22 in the other heating zone.

[0061] Generally, for any two adjacent heating zones, due to the existence of temperature diffusion, there is a certain transition state (transition zone) between the two adjacent regions with different light transmittances formed by the two adjacent heating zones.

[0062] For example, as shown in FIG. 4 and FIG. 5, the glass-ceramic material has two regions with different light transmittances, i.e., a low light transmittance region 101 and a high light transmittance region 102, and a transition region 103 between the low light transmittance region 101 and the high light transmittance region 102. As shown in FIG. 1 to FIG. 3, in the preparation process of the glass-ceramic material, the heating device used has two heating zones, i.e., a first heating zone 41 corresponding to the low light transmittance region 101 and a second heating zone 42 corresponding to the high light transmittance region 102. The heating temperature of the first heating zone 41 on the glass-ceramic substrate 1 is higher than that of the second heating zone 42 on the glass-ceramic substrate 1. Due to factors such as temperature diffusion, a transition region exists in the glass-ceramic substrate 1. The transition region is located between the preset low light transmittance region and the preset high light transmittance region. The heating temperature of the transition region is between the heating temperature of the preset low light transmittance region and the heating temperature of the preset high light transmittance region. After heat treatment, the transition region forms the transition region 103 in the prepared glass-ceramic material. The preset low light transmittance region forms the low light transmittance region 101 in the prepared glass-ceramic material. The preset high light transmittance region forms the high light transmittance region 102 in the prepared glass-ceramic material.

[0063] Specifically, in the above-mentioned at least two heating zones, one or more conditions of the thermal conductivity of the clamping plate, the material of the clamping plate, the thickness of the clamping plate, the distance between the clamping plate and the heating plate, and the heating power of the heating plate in any two heating zones are different, so as to realize different heating temperatures of the glass-ceramic substrate 1 in each two heating zones.

[0064] In the above-mentioned at least two heating zones, the thermal conductivity of the clamping plate in any two heating zones is different, which means that the thermal conductivity of the first clamping plate 21 in one heating zone is different from that of the first clamping plate 21 in another heating zone, the thermal conductivity of the second clamping plate 22 in one heating zone is different from that of the second clamping plate 22 in another heating zone, and the thermal conductivities of the first clamping plate 21 and the second clamping plate 22 in the same heating zone are basically the same.

[0065] In the above-mentioned at least two heating zones, the material of the clamping plate in any two heating zones is different, which means that the material of the first clamping plate 21 in one heating zone is different from that of the first clamping plate 21 in another heating zone, the material of the second clamping plate 22 in one heating zone is different from that of the second clamping plate 22 in another heating zone, and the materials of the first clamping plate 21 and the second clamping plate 22 in the same heating zone are basically the same.

[0066] In the above-mentioned at least two heating zones, the thickness of the clamping plate in any two heating zones is different, which means that the thickness of the first clamping plate 21 in one heating zone is different from that of the first clamping plate 21 in another heating zone, the thickness of the second clamping plate 22 in one heating zone is different from that of the second clamping plate 22 in another heating zone, and the thicknesses of the first clamping plate 21 and the second clamping plate 22 in the same heating zone are basically the same.

[0067] wherein the distance between the clamping plate and the heating plate in any two heating zones is different refers to that in the two heating zones, the distance between the first clamping plate 21 and the first heating plate 31 in one heating zone is different from the distance between the first clamping plate 21 and the first heating plate 31 in the other heating zone, the distance between the second clamping plate 22 and the second heating plate 32 in one heating zone is different from the distance between the second clamping plate 22 and the second heating plate 32 in the other heating zone, and in the same heating zone, the distance between the first clamping plate 21 and the first heating plate 31 is substantially the same as the distance between the second clamping plate 22 and the second heating plate 32.

[0068] wherein the heating power of the heating plate in any two heating zones is different refers to that in the two heating zones, the heating power of the first heating plate 31 in one heating zone is different from the heating power of the first heating plate 31 in the other heating zone, the heating power of the second heating plate 32 in one heating zone is different from the heating power of the second heating plate 32 in the other heating zone, and in the same heating zone, the heating power of the first heating plate 31 is substantially the same as the heating power of the second heating plate 32.

[0069] Specifically, the material of the clamping plate (i.e. the material of the first clamping plate 21 and the second clamping plate 22) can include one or more of graphite, ceramic, metal, and the material of the first clamping plate 21 and the second clamping plate 22 in the same heating zone is the same.

[0070] Generally, the higher the thermal conductivity of the clamping plate, the easier it is to conduct heat, and the higher the heating temperature of the microcrystalline glass substrate 1, so that a region with relatively low light transmittance is formed in the prepared microcrystalline glass material. Therefore, by the difference in the thermal conductivity of the molds of different heating zones, the difference in the surface temperature of the microcrystalline glass substrate 1 during heat treatment (i.e. heat treatment of at least two regions of the microcrystalline glass substrate 1 at different temperatures) is achieved, so that the prepared microcrystalline glass material has different regions with different crystallinity, grain size, and crystal type, etc., thereby forming a non-uniform transmittance effect.

[0071] In some embodiments, the thermal conductivity of the clamping plate in at least one heating zone is 50-2000 w / (m-k), such as 50 w / (m-k), 100 w / (m-k), 300 w / (m-k), 500 w / (m-k), 800 w / (m-k), 1000 w / (m-k), 1300 w / (m-k), 1500 w / (m-k), 1800 w / (m-k), 2000 w / (m-k), or a range between any two of them.

[0072] In some embodiments, the thermal conductivity of the clamping plate in at least one heating zone is 0.01-30 w / (m-k), for example, 0.01 w / (m-k), 0.05 w / (m-k), 0.1 w / (m-k), 0.5 w / (m-k), 1 w / (m-k), 3 w / (m-k), 5 w / (m-k), 8 w / (m-k), 10 w / (m-k), 13 w / (m-k), 15 w / (m-k), 18 w / (m-k), 20 w / (m-k), 23 w / (m-k), 25 w / (m-k), 28 w / (m-k), 30 w / (m-k), or a range between any two of them.

[0073] In some embodiments, as shown in FIG. 1, for any two heating zones, one of which is the first heating zone 41 and the other of which is the second heating zone 42, the clamping plate in the first heating zone 41 is connected to the clamping plate in the second heating zone 42, and the thermal conductivities of the clamping plate in the first heating zone 41 and the clamping plate in the second heating zone 42 are different, that is, the first clamping plate 21 in the first heating zone 41 is connected to the first clamping plate 21 in the second heating zone 42, and the thermal conductivities of the first clamping plate 21 in the first heating zone 41 and the first clamping plate 21 in the second heating zone 42 are different, the second clamping plate 22 in the first heating zone 41 is connected to the second clamping plate 22 in the second heating zone 42, and the thermal conductivities of the second clamping plate 22 in the first heating zone 41 and the second clamping plate 22 in the second heating zone 42 are different, wherein the clamping plate in the first heating zone 41 can be in direct contact with the heating plate (the first clamping plate 21 is in contact with the first heating plate 31, and the second clamping plate 22 is in contact with the second heating plate 32).

[0074] With continued reference to FIGS. 1 and 3, each clamping plate includes at least two sub-clamping plates, that is, the clamping plate is spliced from sub-clamping plates of different materials (different thermal conductivities) (the first clamping plate 21 is spliced from sub-clamping plates of different materials, and the second clamping plate 22 is spliced from sub-clamping plates of different materials), wherein for any two sub-clamping plates, at least part of one of the sub-clamping plates is located in a different heating zone from the other sub-clamping plate, for example, the two sub-clamping plates are located in different heating zones (as shown in FIG. 1), or part of one sub-clamping plate is located in one heating zone and the remaining part and the other sub-clamping plate are located in another heating zone (as shown in FIG. 3).

[0075] Specifically, as shown in FIGS. 1 and 3, for any two sub-clamping plates, one of which is the first sub-clamping plate 201 and the other of which is the second sub-clamping plate 202, the first clamping plate 21 includes the first sub-clamping plate 201 and the second sub-clamping plate 202, and the second clamping plate 22 includes the first sub-clamping plate 201 and the second sub-clamping plate 202.

[0076] In some embodiments, as shown in FIG. 1, for any two heating zones, one of which is the first heating zone 41 and the other of which is the second heating zone 42, the first clamp plate 21 includes a first sub-clamp plate 201 located at the first heating zone 41 and a second sub-clamp plate 202 located at the second heating zone 42, and the second clamp plate 22 includes the first sub-clamp plate 201 located at the first heating zone 41 and the second sub-clamp plate 202 located at the second heating zone 42, that is, for any two heating zones, the material of the sub-clamp plate (the first sub-clamp plate 201) in one heating zone is different from the material of the sub-clamp plate (the second sub-clamp plate 202) in the other heating zone, so that the thermal conductivity of the clamp plates in the two heating zones is different, to achieve the difference in the heating temperature of the glass-ceramic substrate 1 in the two heating zones, that is, to achieve the heat treatment of the glass-ceramic substrate 1 in the two heating zones at different temperatures, and the area of the glass-ceramic substrate 1 in contact with the clamp plate with higher thermal conductivity will form an area with lower light transmittance (such as the low light transmittance area 101) after heat treatment, and the area of the glass-ceramic substrate 1 in contact with the clamp plate with lower thermal conductivity will form an area with higher light transmittance (such as the high light transmittance area 102) after heat treatment.

[0077] Specifically, the sub-clamp plate can be a graphite clamp plate, a ceramic clamp plate (the materials of the first clamp plate 21 and the second clamp plate 22 are ceramic), or a metal clamp plate. That is, the material of the first sub-clamp plate 201 can be graphite, ceramic, or metal, the material of the second sub-clamp plate 202 can be graphite, ceramic, or metal, and the materials of the first sub-clamp plate 201 and the second sub-clamp plate 202 are different.

[0078] For example, for any two heating zones, the clamp plate (the first sub-clamp plate 201) in one heating zone is of graphite material (at this time, the mold in this heating zone is a graphite mold), and the clamp plate (the second sub-clamp plate 202) in the other heating zone is of ceramic material (at this time, the mold in this heating zone is a ceramic mold), and because the thermal conductivities of the ceramic mold and the graphite mold are different, the temperature transferred to the surface of the glass-ceramic substrate 1 is different, so that the heating temperature of the area of the glass-ceramic substrate 1 in contact with the ceramic mold and the heating temperature of the area of the glass-ceramic substrate 1 in contact with the graphite mold are different during heat treatment, and thus the crystallinity, grain size, and crystal type of the two areas change differently, forming areas with different light transmittances in the prepared glass-ceramic material.

[0079] Specifically, the thermal conductivity of the ceramic material is low, so that the heating temperature of the area of the glass-ceramic substrate 1 in contact with the ceramic mold during the heat treatment is low, and the crystallinity and other characteristics of the area are not affected by the heat treatment, so that the area of the prepared glass-ceramic material has a high light transmittance, forming a high light transmittance area 102; the thermal conductivity of the graphite material is high, so that the heating temperature of the area of the glass-ceramic substrate 1 in contact with the graphite mold during the heat treatment is high, and the crystallinity, grain size and crystal type of the area are changed greatly, so that the light transmittance of the area of the prepared glass-ceramic material is reduced, forming a low light transmittance area 101.

[0080] In some embodiments, as shown in FIG. 3, for any two adjacent heating areas, one of which is the first heating area 41 and the other of which is the second heating area 42; the clamping plate comprises a first sub-clamping plate 201 and a second sub-clamping plate 202, the first sub-clamping plate 201 comprises a main body part located in the first heating area 41 and an extension part located in the second heating area 42, the main body part is connected with the extension part, and the main body part is in contact with the heating plate in the first heating area 41, the second sub-clamping plate 202 is located in the second heating area 42, and the second sub-clamping plate 202 is located between the extension part and the heating plate, and the second sub-clamping plate 202 can be in contact with the heating plate, so that during the heat treatment of the glass-ceramic substrate 1, the second sub-clamping plate 202 is located between the extension part of the first sub-clamping plate 201 and the heating plate in the second heating area 42, and the thermal conductivity of the second sub-clamping plate 202 is different from that of the first sub-clamping plate 201, so that the heating temperature of the second heating area 42 to the glass-ceramic substrate 1 is different from that of the first heating area 41 to the glass-ceramic substrate 1, thereby realizing that the prepared glass-ceramic material has areas with different light transmittances, and at the same time, in any heating area, the first sub-clamping plate 201 is in direct contact with the glass-ceramic substrate 1, so that the surface of the glass-ceramic material has better uniformity, avoiding the influence of the surface uniformity of the glass-ceramic material due to the contact of the glass-ceramic substrate 1 with clamping plates of different materials during the heat treatment, and at the same time, the heat of the heating area with a higher temperature is diffused through the first sub-clamping plate 201, which can also increase the width of the gradual change area 103 (specifically, the width of the gradual change area 103 can be greater than or equal to 1 cm).

[0081] Generally, the thermal conductivity of the first sub-clamping plate 201 is greater than that of the second sub-clamping plate 202, for example, the first sub-clamping plate 201 is made of graphite material, and the second sub-clamping plate 202 is made of ceramic material, so that the heating temperature of the first heating area 41 to the glass-ceramic substrate 1 is higher than that of the second heating area 42 to the glass-ceramic substrate 1, realizing the temperature heat treatment of at least two areas of the glass-ceramic substrate 1, forming at least two areas with different light transmittances, and preparing the glass-ceramic material.

[0082] In practice, the size and shape of each clamp plate can be adjusted according to the position and shape of the different light transmittance regions in the glass-ceramic material, and no specific limitation is imposed.

[0083] In addition, the greater the distance between the clamp plate and the heating plate, the less heat the heating plate conducts to the mold, the lower the heating temperature of the glass-ceramic substrate 1 during the heat treatment process, and the higher the light transmittance of the glass-ceramic material formed. Therefore, by designing the structure of the mold, the distance between the clamp plate and the heating plate in different heating zones can be different, and different temperature heat treatment can be performed on different regions of the glass-ceramic substrate 1.

[0084] In some embodiments, as shown in FIG. 2, in any two heating zones, the clamp plate in the heating zone with a higher temperature is in direct contact with the heating plate (i.e., the first clamp plate 21 in the heating zone is in direct contact with the first heating plate 31, and the second clamp plate 22 is in direct contact with the second heating plate 32), and there is a gap 20 between the clamp plate and the heating plate in the heating zone with a lower temperature (i.e., there is a gap 20 between the first clamp plate 21 and the first heating plate 31 in the heating zone, and there is a gap 20 between the second clamp plate 22 and the second heating plate 32, and the distance between the first clamp plate 21 and the first heating plate 31 is substantially equal to the distance between the second clamp plate 22 and the second heating plate 32 (the width of the gap 20 in the direction from the clamp plate to the heating plate)), thereby achieving different temperature heat treatment of at least two regions of the glass-ceramic substrate 1. Wherein the first clamp plate 21 can be integrally formed (i.e., the first clamp plates 21 of different heating zones are integrally formed, rather than being formed by splicing multiple sub-clamp plates), and the second clamp plate 21 can be integrally formed (i.e., the second clamp plates 22 of different heating zones are integrally formed, rather than being formed by splicing multiple sub-clamp plates).

[0085] Specifically, as shown in FIGS. 1-3, in each heating zone, the clamping plate is in direct contact with the glass-ceramic substrate 1, that is, the first clamping plate 21 is in direct contact with one side surface of the glass-ceramic substrate 1, and the second clamping plate 22 is in direct contact with the other side surface of the glass-ceramic substrate 1. The thickness of the clamping plate in the heating zone with a higher temperature is greater than the thickness of the clamping plate in the heating zone with a lower temperature, that is, the thickness of the first clamping plate 21 in the heating zone with a higher temperature is greater than the thickness of the first clamping plate 21 in the heating zone with a lower temperature, and the thickness of the second clamping plate 22 in the heating zone with a higher temperature is greater than the thickness of the second clamping plate 22 in the heating zone with a lower temperature, so that the clamping plate in the heating zone with a higher temperature is in direct contact with the heating plate (i.e., the spacing between the clamping plate and the heating plate is substantially 0), while there is a gap 20 between the clamping plate and the heating plate in the heating zone with a lower temperature (i.e., the spacing between the clamping plate and the heating plate is greater than 0), that is, the side of the clamping plate in the heating zone with a lower temperature facing the heating plate forms a hollowed-out region (i.e., the gap 20), which does not contact the heating plate, so that the heat conduction of the clamping plate in the two different heating zones to the glass-ceramic substrate 1 is different, the surface temperature of the glass-ceramic substrate 1 during the heat treatment process is different (i.e., the heat treatment of at least two regions of the glass-ceramic substrate 1 at different temperatures is realized), so that the crystallinity, grain size, and crystal type of different regions of the prepared glass-ceramic material are different, and the effect of non-uniform transmittance is formed.

[0086] In addition, the heat treatment of different regions of the glass-ceramic substrate 1 at different temperatures can also be realized by the partition design of the heating plate, for example, the heating plate is partitioned and operated, the heating power of different partitions is different, the heating temperature of different regions of the glass-ceramic substrate 1 is different, the surface temperature of the glass-ceramic substrate 1 during the heat treatment process is different (i.e., the heat treatment of at least two regions of the glass-ceramic substrate 1 at different temperatures is realized), so that the crystallinity, grain size, and crystal type of different regions of the prepared glass-ceramic material are different, and the effect of non-uniform transmittance is formed.

[0087] In specific implementation, the temperature (i.e., the heating temperature of the glass-ceramic substrate 1 by each heating zone) and time and the like conditions of the heat treatment of at least part of the regions of the glass-ceramic substrate 1 can be regulated according to the transmittance and the like characteristics of each region of the glass-ceramic material, for example, the heating temperature of the above-mentioned heating zone to the glass-ceramic substrate 1 can be between 300-1000℃, and the time can be between 1-60 min, but is not limited thereto. The heating temperature of the heating zone to the glass-ceramic substrate 1 specifically refers to the temperature of the heating plate, and the heat of the heating plate is transmitted to the glass-ceramic substrate 1 through the clamping plate to heat treat the glass-ceramic substrate 1.

[0088] In the embodiments of the present application, the microcrystalline glass substrate 1 used can be a conventional microcrystalline glass in the art, which can be commercially available or self-made according to conventional methods in the art, and no particular limitation is made thereto.

[0089] In the embodiments of the present application, the microcrystalline glass substrate 1 used can be transparent microcrystalline glass (colorless transparent glass) or semi-transparent colored microcrystalline glass doped with transition metal ions (semi-transparent colored microcrystalline glass formed by doping transition metal ions).

[0090] In the embodiments of the present application, the microcrystalline glass substrate 1 used can be in the form of a flat sheet (i.e., the microcrystalline glass substrate 1 can be a sheet-shaped microcrystalline glass (or flat sheet microcrystalline glass, 2D microcrystalline glass)) or have a curved structure (i.e., the microcrystalline glass substrate 1 can be a microcrystalline glass having a curved structure (or 3D microcrystalline glass)), or can be a microcrystalline glass in other regular or irregular shapes.

[0091] In specific implementations, a flat sheet microcrystalline glass can be directly used as the microcrystalline glass substrate 1, or a flat sheet microcrystalline glass can be formed into a 3D microcrystalline glass through a hot bending forming process and then used as the microcrystalline glass substrate 1, and then the above heat treatment process is performed to realize the changes in the crystallinity and grain size of different regions of the microcrystalline glass (e.g., to realize the increase in the crystallinity and the growth in the crystal size of local regions), so as to realize the changes in the crystallinity, grain size, and crystal type of different regions on the same microcrystalline glass, and to cause the changes in the light transmittance of different regions, thereby obtaining a microcrystalline glass material having at least two regions with different light transmittances.

[0092] Generally, the microcrystalline glass substrate 1 has uniform light transmittance and uniform crystallization inside, i.e., the light transmittance of each region is basically consistent, and the crystallinity of each region is basically consistent.

[0093] In some embodiments, the crystallinity of the microcrystalline glass substrate 1 can be 30%-95%, such as 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or a range between any two of them.

[0094] In some embodiments, the crystals in the microcrystalline glass substrate 1 can include one or more of petalite, spinel, lithium phosphate, lithium monosilicate, lithium disilicate, aluminum phosphate, aluminum metaphosphate, zirconium silicate, quartz, and quartz solid solution.

[0095] In some embodiments, the average grain size of the crystals in the microcrystalline glass substrate 1 can be 5-100 nm, such as 5 nm, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, or a range between any two of them.

[0096] In some embodiments, the glass-ceramic substrate 1 comprises the following molar fractions of components: Li2O: 10% to 25%; SiO2: 58% to 72%; Na2O + K2O: 3% to 7%; Al2O3: 2% to 8%; P2O5 + ZrO2 + TiO2: 2% to 13%; MgO + CaO + ZnO: 0 to 3%; B2O3: 0 to 5%.

[0097] The embodiment of the present application also provides a heating device for preparing the above glass-ceramic material or for implementing the above method for preparing the glass-ceramic material, as shown in FIGS. 1 to 3, which comprises: a mold comprising two clamping plates (a first clamping plate 21 and a second clamping plate 22), the two clamping plates being used to clamp the glass-ceramic substrate 1, and then heat treating at least a partial region of the glass-ceramic substrate 1 through the clamping plates to prepare the glass-ceramic material having at least two regions with different light transmittances; and heating plates used to heat the clamping plates and then heat at least a partial region of the glass-ceramic substrate 1 through the clamping plates to heat treat at least a partial region of the glass-ceramic substrate 1 through the clamping plates to prepare the glass-ceramic material; wherein during the heat treatment of at least a partial region of the glass-ceramic substrate 1, there is a heating plate on the side of each clamping plate away from the glass-ceramic substrate 1 (the heating plate on the side of the first clamping plate 21 away from the glass-ceramic substrate 1 is referred to as a first heating plate 31, and the heating plate on the side of the second clamping plate 22 away from the glass-ceramic substrate 1 is referred to as a second heating plate 32).

[0098] Specifically, during the heat treatment, the glass-ceramic substrate 1 is located between the first clamping plate 21 and the second clamping plate 22, the first heating plate 31 is located on the side of the first clamping plate 21 away from the glass-ceramic substrate 1, the second heating plate 32 is located on the side of the second clamping plate 22 away from the glass-ceramic substrate 1, the first clamping plate 21 is heated by the first heating plate 31, the second clamping plate 22 is heated by the second heating plate 32, and then at least a partial region of the glass-ceramic substrate 1 is heated by the first clamping plate 21 and the second clamping plate 22 to heat treat at least a partial region of the glass-ceramic substrate 1 to form at least two regions with different light transmittances and prepare the glass-ceramic material.

[0099] As described above, the heating device comprises at least two heating zones (as shown in FIGS. 1 to 3), and one or more of the following conditions in any two heating zones are different: the thermal conductivity of the clamping plates, the material of the clamping plates, the thickness of the clamping plates, the distance between the clamping plates and the heating plates, and the heating power of the heating plates, so as to realize that the heating temperatures of the two heating zones on the glass-ceramic substrate 1 are different during the heat treatment.

[0100] As described above, in some embodiments, as shown in FIG. 1, for any two heating zones, one of which is the first heating zone 41 and the other of which is the second heating zone 42, the clamping plate in the first heating zone 41 is connected to the clamping plate in the second heating zone 42, and the thermal conductivity of the clamping plate in the first heating zone 41 is different from the thermal conductivity of the clamping plate in the second heating zone 42, that is, the first clamping plate 21 in the first heating zone 41 is connected to the first clamping plate 21 in the second heating zone 42, and the thermal conductivity of the first clamping plate 21 in the first heating zone 41 is different from the thermal conductivity of the first clamping plate 21 in the second heating zone 42, the second clamping plate 22 in the first heating zone 41 is connected to the second clamping plate 22 in the second heating zone 42, and the thermal conductivity of the second clamping plate 22 in the first heating zone 41 is different from the thermal conductivity of the second clamping plate 22 in the second heating zone 42, wherein the clamping plate in the first heating zone 41 can be in direct contact with the heating plate (the first clamping plate 21 is in contact with the first heating plate 31, and the second clamping plate 22 is in contact with the second heating plate 32).

[0101] As described above, in some embodiments, as shown in FIG. 3, for any two adjacent heating zones, one of which is the first heating zone 41 and the other of which is the second heating zone 42; the clamping plate comprises a first sub-clamping plate 201 and a second sub-clamping plate 202, the first sub-clamping plate 201 comprises a main body part located in the first heating zone 41 and an extension part located in the second heating zone 42, the main body part is connected to the extension part, and the main body part is in direct contact with the heating plate in the first heating zone 41, the second sub-clamping plate 202 is located in the second heating zone 42, and the second sub-clamping plate 202 is located between the extension part and the heating plate, and the second sub-clamping plate 202 can be in direct contact with the heating plate.

[0102] As described above, in some embodiments, as shown in FIG. 2, for any two heating zones, the clamping plate in the heating zone with higher temperature is in direct contact with the heating plate (i.e., the first clamping plate 21 in the heating zone is in direct contact with the first heating plate 31, and the second clamping plate 22 is in direct contact with the second heating plate 32), and there is a gap 20 between the clamping plate in the heating zone with lower temperature and the heating plate (i.e., there is a gap 20 between the first clamping plate 21 and the first heating plate 31 in the heating zone, and there is a gap 20 between the second clamping plate 22 and the second heating plate 32, and the distance between the first clamping plate 21 and the first heating plate 31 is substantially equal to the distance between the second clamping plate 22 and the second heating plate 32).

[0103] As described above, in some embodiments, the thermal conductivity of the mold of at least one heating zone can be 50-2000 w / (m-k).

[0104] As described above, in some embodiments, the thermal conductivity of the mold of at least one heating zone can be 0.01-30 w / (m-k).

[0105] As mentioned above, the material of the clamping plate can include one or more of graphite, ceramic, and metal.

[0106] The embodiment of the present application also provides a structural member comprising the microcrystalline glass material, which has the advantages corresponding to the microcrystalline glass material, and details are not repeated.

[0107] Specifically, the structural member can be an appearance structural member of an electronic product such as a mobile phone, for example, a battery cover, a mobile phone back cover (back cover plate), a lens, a housing of a wearable device, and the like, and details are not particularly limited.

[0108] In specific implementation, the microcrystalline glass material can be used to process the structural member through a thickness numerical control machine tool (CNC), a film plating process, and the like, and these processes are all conventional operations in the field, and details are not particularly limited.

[0109] The embodiment of the present application also provides a terminal product comprising the structural member, which has the advantages corresponding to the microcrystalline glass material, and details are not repeated.

[0110] Specifically, the terminal product can be a terminal product such as an electronic product such as a mobile phone, a wearable device, and the like, and details are not particularly limited.

[0111] The present application is further described below through specific embodiments.

[0112] In the following embodiments, the microcrystalline glass substrate 1 used includes the following components in terms of mole percentage: Li2O: 10% to 25%; SiO2: 58% to 72%; Na2O+K2O: 3% to 7%; Al2O3: 2% to 8%; P2O5+ZrO2+TiO2: 2% to 13%; MgO+CaO+ZnO: 0 to 3%; B2O3: 0 to 5%.

[0113] Embodiment 1

[0114] The structural diagram of the microcrystalline glass material of this embodiment 1 is shown in FIG. 4, which includes two regions with different light transmittances (low light transmittance region 101 and high light transmittance region 102), and a gradient region 103 between the low light transmittance region 101 and the high light transmittance region 102, the light transmittance of the gradient region 103 is between the light transmittance of the high light transmittance region 102 and the light transmittance of the low light transmittance region 101, and the light transmittance of the gradient region 103 shows an increasing trend along the direction from the low light transmittance region 101 to the high light transmittance region 102.

[0115] The preparation process of the microcrystalline glass material of this embodiment 1 is as follows:

[0116] The preset high light transmission area and the preset low light transmission area of the glass-ceramic substrate 1 are heat treated by using a heating device to obtain the glass-ceramic material.

[0117] The glass-ceramic substrate 1 is a colorless and transparent glass-ceramic sheet, the average crystal size is 30 nm, the crystallinity is 75%, and the visible light transmittance is 91%.

[0118] The heating device includes a heating plate (a first heating plate 31 and a second heating plate 32) and a mold, and the mold includes a first clamping plate 21 and a second clamping plate 22. During the heat treatment, the glass-ceramic substrate 1 is located between the first clamping plate 21 and the second clamping plate 22, the first heating plate 31 is located on the side of the first clamping plate 21 away from the glass-ceramic substrate 1, the second heating plate 32 is located on the side of the second clamping plate 22 away from the glass-ceramic substrate 1, the first clamping plate 21 is heated by the first heating plate 31, the second clamping plate 22 is heated by the second heating plate 32, and then the glass-ceramic substrate 1 is heated by the first clamping plate 21 and the second clamping plate 22, so that the preset high light transmission area and the preset low light transmission area of the glass-ceramic substrate 1 are heat treated to obtain the glass-ceramic material.

[0119] As shown in FIG. 1, the heating device includes two heating areas, i.e., a first heating area 41 corresponding to the low light transmission area 101 and a second heating area 42 corresponding to the high light transmission area 102. The mold is composed of a graphite mold and a ceramic mold, i.e., the mold of the first heating area 41 is a graphite mold (the first clamping plate 21 and the second clamping plate 22 of the first heating area 41 are both graphite materials), and the mold of the second heating area 42 is a ceramic mold (the first clamping plate 21 and the second clamping plate 22 of the second heating area 42 are both ceramic materials).

[0120] During the heat treatment, the temperature of the heating plate is 880℃ (the temperature of the first heating plate 31 and the second heating plate 32 is 880℃ respectively), and the heat treatment time (heating time) of the glass-ceramic substrate 1 is 30 min. After the heat treatment, the glass-ceramic material is obtained.

[0121] During the heat treatment, the mold of the first heating area 41 is a graphite mold, which has high thermal conductivity, so that the surface temperature of the glass-ceramic substrate 1 is high, and the crystallinity, the grain size and the crystal type of the glass-ceramic substrate 1 change greatly. In the obtained glass-ceramic material, the grain size in the low light transmission area 101 is about 110 nm, the crystallinity is more than 98%, and the average visible light transmittance is about 40% (as shown in FIG. 4).

[0122] The mold in the second heating zone 42 is a ceramic mold, which has low thermal conductivity, so that the surface temperature of the glass-ceramic substrate 1 is low, and the crystallinity and other characteristics of the glass-ceramic substrate 1 are basically not affected. In the prepared glass-ceramic material, the grain size in the high light transmission zone 102 is basically maintained at about 30 nm, the crystallinity is about 90%, and the average visible light transmittance is about 90% (as shown in FIG. 4).

[0123] Meanwhile, due to factors such as temperature diffusion (heat of the first heating zone 41 diffuses along the first clamp plate 21 and the second clamp plate 22 to the second heating zone 42), after heat treatment, a gradient zone 103 is formed between the low light transmission zone 101 and the high light transmission zone 102 of the glass-ceramic material. The visible light transmittance of the gradient zone 103 is between the visible light transmittance of the low light transmission zone 101 and the visible light transmittance of the high light transmission zone 102, and the visible light transmittance of the gradient zone 103 shows an increasing trend along the direction from the low light transmission zone 101 to the high light transmission zone 102; as shown in FIG. 4, the grain size of the gradient zone 103 reaches about 60 nm, the crystallinity reaches about 95%, the average visible light transmittance is about 70%, and the width of the gradient zone 103 in the direction from the low light transmission zone 101 to the high light transmission zone 102 is about 1 mm.

[0124] Embodiment 2

[0125] The structure of the glass-ceramic material of this embodiment 2 is shown in FIG. 5, which includes two regions with different light transmittances (low light transmission zone 101 and high light transmission zone 102), and gradient zone 103 between the low light transmission zone 101 and the high light transmission zone 102. The light transmittance of the gradient zone 103 is between the light transmittance of the high light transmission zone 102 and the light transmittance of the low light transmission zone 101, and the light transmittance of the gradient zone 103 shows an increasing trend along the direction from the low light transmission zone 101 to the high light transmission zone 102.

[0126] The preparation process of the glass-ceramic material of this embodiment 1 is as follows:

[0127] The preset high light transmission zone and the preset low light transmission zone of the glass-ceramic substrate 1 are heat treated by using a heating device to prepare a glass-ceramic material.

[0128] The glass-ceramic substrate 1 is a colorless and transparent glass-ceramic sheet, which has an average crystal size of 30 nm, a crystallinity of 75%, and a visible light transmittance (light transmittance) of 91%.

[0129] The structure diagram of the heating device is shown in FIG. 2, and the heating device comprises a heating plate (a first heating plate 31 and a second heating plate 32) and a mold, and the mold comprises a first clamping plate 21 and a second clamping plate 22; during the heat treatment, the microcrystalline glass substrate 1 is located between the first clamping plate 21 and the second clamping plate 22, the first heating plate 31 is located on the side of the first clamping plate 21 away from the microcrystalline glass substrate 1, the second heating plate 32 is located on the side of the second clamping plate 22 away from the microcrystalline glass substrate 1, the first clamping plate 21 is heated by the first heating plate 31, the second clamping plate 22 is heated by the second heating plate 32, and then the microcrystalline glass substrate 1 is heated by the first clamping plate 21 and the second clamping plate 22, so that the preset high-transmittance area and the preset low-transmittance area of the microcrystalline glass substrate 1 are heat treated, and the microcrystalline glass material is prepared.

[0130] As shown in FIG. 2, the heating device comprises two heating areas, namely a first heating area 41 corresponding to the low-transmittance area 101 and a second heating area 42 corresponding to the high-transmittance area 102; the mold is made of graphite (that is, the first clamping plate 21 and the second clamping plate 22 of each heating area are made of graphite), the clamping plates of the first heating area 41 are in direct contact with the heating plates (the first clamping plate 21 is in direct contact with the first heating plate 31, and the second clamping plate 22 is in direct contact with the second heating plate 32), and there is a gap 20 between the clamping plates and the heating plates of the second heating area 42 (there is a gap 20 between the first clamping plate 21 and the first heating plate 31 in the second heating area 42, there is a gap 20 between the second clamping plate 22 and the second heating plate 32, and the distance between the first clamping plate 21 and the first heating plate 31 is substantially equal to the distance between the second clamping plate 22 and the second heating plate 32).

[0131] As shown in FIG. 2, the first heating area 41 is located in the middle of the heating device (the first heating area 41 is substantially circular), and the second heating area 42 is annularly arranged outside the first heating area 41.

[0132] In the heat treatment process, the temperature of the heating plate is 720℃ (the temperature of the first heating plate 31 and the second heating plate 32 is 700℃ respectively), the time (heating time) of the heat treatment of the glass-ceramic substrate 1 is 30min, and the glass-ceramic material is prepared after the heat treatment. Because the contact between the clamping plate of the mold and the heating plate is non-uniform (there is a gap 20 between the mold and the heating plate in the second heating area 42), the preset low light transmission area and the preset high light transmission area of the glass-ceramic substrate 1 are heated differently. The clamping plate of the first heating area 41 directly contacts the heating plate, so that the temperature of the first heating area 41 is quickly transferred, and the surface temperature of the preset low light transmission area of the glass-ceramic substrate 1 located in the first heating area 41 is about 700℃. The clamping plate of the second heating area 42 is separated from the heating plate by the gap 20, so that the temperature of the second heating area 42 is slowly transferred, and the surface temperature of the preset high light transmission area of the glass-ceramic substrate 1 located in the second heating area 42 is about 670℃.

[0133] As shown in FIG. 5, in the prepared glass-ceramic material, the grain size in the low light transmission area 101 is about 110nm, the crystallinity is more than 98%, and the average visible light transmittance is about 20%; the grain size in the high light transmission area 102 is about 50nm, the crystallinity is about 90%, and the average visible light transmittance is about 70%; at the same time, the visible light transmittance of the gradient area 103 formed between the low light transmission area 101 and the high light transmission area 102 is between the visible light transmittance of the low light transmission area 101 and the visible light transmittance of the high light transmission area 102, and the visible light transmittance of the gradient area 103 increases along the direction from the low light transmission area 101 to the high light transmission area 102, and the width of the gradient area 103 in the direction from the low light transmission area 101 to the high light transmission area 102 is about 1mm.

[0134] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A microcrystalline glass material, characterized in that, The microcrystalline glass material comprises at least two regions with different light transmittances; wherein for any two adjacent regions with different light transmittances, one with a smaller light transmittance is a low light transmittance region, and the other with a larger light transmittance is a high light transmittance region; there is a transition region between the low light transmittance region and the high light transmittance region, the light transmittance of the transition region is between the light transmittance of the high light transmittance region and the light transmittance of the low light transmittance region, and the light transmittance of the transition region increases in the direction from the low light transmittance region to the high light transmittance region.

2. The microcrystalline glass material of claim 1, wherein, The difference between the light transmittance of the high light transmittance region and the light transmittance of the low light transmittance region is greater than or equal to 10%.

3. The glass-ceramic material according to claim 1, characterized in that, One or more of the crystallinity, the crystal size, and the crystal type composition of the low light transmittance region and the high light transmittance region are different.

4. The microcrystalline glass material according to any one of claims 1-3, characterized in that, The difference between the crystallinity of the low light transmittance region and the crystallinity of the high light transmittance region is 3%-80%; And / or, the difference between the crystal size of the low light transmittance region and the crystal size of the high light transmittance region is 10-500 nm.

5. The glass-ceramic material according to any one of claims 1 to 3, characterized in that, The width of the transition region in the direction from the low light transmittance region to the high light transmittance region is greater than or equal to 0.5 mm.

6. The glass-ceramic material according to any one of claims 1 to 3, characterized in that, The microcrystalline glass material is formed by heat treating at least a part of the microcrystalline glass substrate, wherein the at least two regions with different light transmittances are formed by the heat treatment of at least a part of the microcrystalline glass substrate.

7. The glass-ceramic material according to claim 6, characterized in that, In the region subjected to the heat treatment, the microcrystalline glass material is different from the microcrystalline glass substrate in one or more of the crystallinity, the crystal size, and the crystal type composition.

8. A method of producing the glass-ceramic material according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: The microcrystalline glass material is prepared by heat treating at least a part of the microcrystalline glass substrate and forming at least two regions with different light transmittances after the heat treatment.

9. The method of claim 8, wherein the glass-ceramic material is prepared by the steps of: The heat treatment is performed by using a heating device, the heating device comprises at least two heating zones, the at least two heating zones correspond to the at least two regions with different light transmittances one by one, and the heating temperature of each two heating zones on the microcrystalline glass substrate is different, so that the at least two regions of the microcrystalline glass substrate are subjected to heat treatment at different temperatures, the at least two regions with different light transmittances are formed, and the microcrystalline glass material is prepared.

10. The method of claim 9, wherein the glass-ceramic material is prepared by the steps of: The heating device comprises a heating plate and a mold, the mold comprises clamping plates located on opposite sides of the microcrystalline glass substrate, and the clamping plates located on opposite sides of the microcrystalline glass substrate each has a heating plate on the side away from the microcrystalline glass substrate; in the process of the heat treatment, the clamping plates are heated by the heating plates, and then the microcrystalline glass substrate is heated by the clamping plates, so as to heat treat at least a part of the microcrystalline glass substrate.

11. The method of claim 10, wherein the glass-ceramic material is prepared by the steps of: One or more of the following conditions of the clamping plates in any two heating zones are different: the thermal conductivity of the clamping plates, the material of the clamping plates, the thickness of the clamping plates, the distance between the clamping plates and the heating plates, and the heating power of the heating plates, so that the heating temperature of each two heating zones on the microcrystalline glass substrate is different.

12. The method of claim 10, wherein, for any two of the heating zones, one of which is a first heating zone and the other of which is a second heating zone, the clamping plate in the first heating zone is connected to the clamping plate in the second heating zone, and the clamping plate in the first heating zone has a different thermal conductivity than the clamping plate in the second heating zone; and / or, for any two adjacent heating zones, one of which is a first heating zone and the other of which is a second heating zone, the clamping plate comprises a first sub-clamping plate and a second sub-clamping plate, the first sub-clamping plate comprises a main body portion located in the first heating zone and an extension portion located in the second heating zone, the main body portion is connected to the extension portion, and the main body portion is in contact with the heating plate, the second sub-clamping plate is located in the second heating zone, and the second sub-clamping plate is located between the extension portion and the heating plate; and / or, for any two of the heating zones, the clamping plate in the heating zone with a higher temperature is in direct contact with the heating plate, and the clamping plate in the heating zone with a lower temperature has a gap between the clamping plate and the heating plate; and / or, the clamping plate in at least one of the heating zones has a thermal conductivity of 50-2000 w / (m-k); and / or, the clamping plate in at least one of the heating zones has a thermal conductivity of 0.01-30 w / (m-k).

13. The method of making a glass-ceramic material according to any one of claims 10 to 12, characterized in that, The clamping plate is made of one or more of graphite, ceramic, and metal.

14. The method of any one of claims 8-12, wherein, the crystals in the glass-ceramic substrate comprise one or more of petalite, spinel, lithium phosphate, monolithium phosphate, dilithium phosphate, aluminum phosphate, aluminum metaphosphate, zirconium silicate, quartz, and quartz solid solution; and / or, the average grain size of the crystals in the glass-ceramic substrate is 5-100 nm; and / or, the glass-ceramic substrate has uniform light transmittance; and / or, the glass-ceramic substrate has a crystallinity of 30%-95%; and / or, the glass-ceramic substrate comprises the following components in the following molar fractions: Li2O: 10%-25%; SiO2: 58%-72%; Na2O+K2O: 3%-7%; Al2O3: 2%-8%; P2O5+ZrO2+TiO2: 2%-13%; MgO+CaO+ZnO: 0-3%; B2O3: 0-5%.

15. A heating device for producing the glass-ceramic material according to any one of claims 1 to 7, or for carrying out the production process of the glass-ceramic material according to any one of claims 8 to 14, characterized in that, The heating device comprises: a mold comprising two clamping plates, the two clamping plates are used to clamp a glass-ceramic substrate, and then at least part of the glass-ceramic substrate is heat treated through the clamping plates to obtain the glass-ceramic material having at least two regions with different light transmittances. The heating plates are used to heat the clamping plates and then heat at least part of the glass-ceramic substrate through the clamping plates to realize heat treatment of at least part of the glass-ceramic substrate through the clamping plates to obtain the glass-ceramic material; wherein during the heat treatment of at least part of the glass-ceramic substrate, the heating plates are respectively arranged on the side of each clamping plate away from the glass-ceramic substrate.

16. The heating device of claim 15, wherein, The heating device comprises at least two heating zones, and one or more conditions of the thermal conductivity of the clamping plate, the material of the clamping plate, the thickness of the clamping plate, the distance between the clamping plate and the heating plate, and the heating power of the heating plate in any two heating zones are different, so that the heating temperature of the glass-ceramic substrate in each two heating zones is different during the heat treatment, and then the heat treatment of at least two regions of the glass-ceramic substrate at different temperatures is realized to obtain the glass-ceramic material.

17. The heating device according to claim 16, wherein, For any two adjacent heating zones, one of which is a first heating zone and the other of which is a second heating zone, the clamping plate in the first heating zone is connected to the clamping plate in the second heating zone, and the thermal conductivity of the clamping plate in the first heating zone is different from that of the clamping plate in the second heating zone; and / or, for any two adjacent heating zones, one of which is a first heating zone and the other of which is a second heating zone; the clamping plate comprises a first sub-clamping plate and a second sub-clamping plate, the first sub-clamping plate comprises a main body part located in the first heating zone and an extension part located in the second heating zone, the main body part is connected to the extension part, and the second sub-clamping plate is located in the second heating zone and between the extension part and the heating plate; and / or, for any two heating zones, the clamping plate in the heating zone with a higher temperature is in direct contact with the heating plate, and the clamping plate in the heating zone with a lower temperature is spaced apart from the heating plate; and / or, the thermal conductivity of the clamping plate in at least one heating zone is 50-2000 w / (m-k); and / or, the thermal conductivity of the clamping plate in at least one heating zone is 0.01-30 w / (m-k).

18. The heating device according to any one of claims 15-17, characterized in that The material of the clamping plate comprises one or more of graphite, ceramic and metal.

19. A structural member, characterized by The glass-ceramic material according to any one of claims 1-7.

20. A terminal product, characterized in that The structural member according to claim 19.

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