Ceramic tile with colorful flashing effect and preparation method thereof

Abstract

The invention discloses a ceramic tile with a colorful glittering effect and a preparation method thereof.The ceramic tile sequentially comprises a green body, a cover glaze layer, a pattern layer, a first glaze layer and a second glaze layer from bottom to top, raw material components for preparing the first glaze layer comprise first dry particles, and raw material components for preparing the second glaze layer comprise composite dry particles; the composite dry particles comprise first dry particles and second dry particles, the refractive index of the first dry particles ranges from 1.45 to 1.50, and the refractive index of the second dry particles ranges from 1.85 to 1.90. According to the invention, by controlling the microstructure and refractive index of the dry granular glaze layer, an interface of the optically denser medium and the optically thinner medium is constructed, and micro-areas of the optically denser medium and the optically thinner medium are formed, so that when light enters the glaze layer of the ceramic tile, the flash effect that the ceramic tile can change along with the angle of the visual angle is realized by changing the angle of the visual angle. Meanwhile, by introducing irregular crystal grains with different refractive indexes, the refractive index of the crystal grains to white light changes along with the wavelength, and a colorful flashing effect is presented.

Description

Technical Field

[0001] The invention belongs to the technical field of building ceramics, and particularly relates to a ceramic tile with a dazzling flashing effect and a preparation method thereof. Background Art

[0002] As a core material for interior and exterior decoration, architectural ceramic tiles have always been the focus of technological innovation for their dual attributes of functionality and aesthetics. Traditional ceramic tiles (such as glazed tiles and polished tiles) mainly achieve decorative effects through glaze coloring, relief textures, or imitation natural stone patterns. However, due to the limitations of material properties and process methods, their optical performance is mostly static color or a single gloss, which makes it difficult to meet the high-end demands of modern architecture for dynamic light and shadow, metallic texture, and technological aesthetics. Therefore, glittering ceramic tiles came into being. Glittering ceramic tiles are a type of high-end architectural decorative ceramic tile that uses special processes or material designs to form optical reflection, scattering, or interference effects on the surface or inside of the brick body, thereby presenting a shimmering, metallic luster, or color change.

[0003] At present, glitter ceramic tiles are generally based on traditional ceramic tiles. By adding optically active materials (such as microcrystalline particles, metal oxides, nano-coatings) or designing special microstructures (such as crystals close to light waves, multi-layer thin film structures), the optical effect of light on the surface or inside of the material is used to produce a glitter effect. Therefore, introducing components with light reflection or scattering into ceramic tiles to improve their decorative properties has become the main design approach for the development of glitter ceramic tiles. Based on this, most of the existing glitter ceramic tiles achieve a glitter effect by adding high-temperature resistant opaque colored embellishments or high-temperature resistant tiny flakes with a reflective effect to the glaze layer of the ceramic tiles. However, this glitter effect mainly utilizes the principle of light reflection, and its optical manifestation is a single glitter luster and static color.

[0004] Therefore, there is an urgent need to develop a ceramic tile with richer glitter effects. Summary of the Invention

[0005] The present invention aims to address at least one of the technical problems existing in the aforementioned prior art. To this end, the present invention provides a ceramic tile with a dazzling shimmering effect and a method for preparing the same. The ceramic tile can exhibit a variety of glosses, with the shimmering point changing with different viewing angles. It can also decompose white light to create a dazzling shimmering effect.

[0006] The inventive concept of the present invention is that during light propagation, due to differences in the propagation medium, optical phenomena such as absorption, scattering, reflection, diffraction, and transmission may occur. When light strikes the interface between a denser medium and a less dense medium at an incident angle greater than or equal to the critical angle, all of the light will be reflected back into the original medium, thereby forming a scintillating point at the interface between the denser and less dense media. Therefore, the present invention controls the structure and composition of the dry particle glaze layer, the refractive index of the dry particles, and the particle size distribution to construct an interface between the denser and less dense media, and to form microregions within the denser and less dense media. When light enters the ceramic tile glaze layer, the microregions within the glaze layer can be observed to fully reflect the light by varying the viewing angle, thereby achieving a scintillating effect that changes with viewing angle. Furthermore, by introducing irregular grains with varying refractive indices, after firing and polishing, their refractive index for white light can change with wavelength, thereby decomposing the light into different colors and presenting a dazzling scintillating effect.

[0007] To solve the above technical problems, the first aspect of the present invention provides a ceramic tile, which includes, from bottom to top, a body, a surface glaze layer, a pattern layer, a first glaze layer and a second glaze layer. The raw material components for preparing the first glaze layer include first dry particles, and the raw material components for preparing the second glaze layer include composite dry particles. The composite dry particles include first dry particles and second dry particles. The refractive index of the first dry particles is between 1.45-1.50, and the refractive index of the second dry particles is between 1.85-1.90.

[0008] Specifically, the present invention employs a double-layer glaze structure, wherein the inner first glaze layer utilizes low-refractive-index dry particles, while the outer second glaze layer incorporates a predetermined amount of high-refractive-index dry particles mixed with the low-refractive-index dry particles. This allows the high-refractive-index dry particles in the second glaze layer to be completely surrounded by the low-refractive-index dry particles in the first and second glaze layers, forming an interface between a denser and less dense medium. After the glaze layers are subsequently fired and polished, not only does the glaze surface serve as a total reflection window for the light source, but the surrounding areas of the high-refractive-index dry particles also form an interface with the low-refractive-index dry particles, reflecting light entering the glaze layers and enhancing the shimmering effect.

[0009] At the same time, according to the formula of total reflection: θc = arcsin(n2 / n1), where: n2 represents the refractive index of the lower density medium, and n1 represents the refractive index of the higher density medium; when n2 = 1.45, n1 = 1.90, θc = 0.868, that is, the critical incident angle is approximately 49.743°, when the incident angle is greater than 49.743°, total reflection occurs at the interface; when n2 = 1.50, n1 = 1.80, θc = 0.985, that is, the critical incident angle is approximately 56.443°, when the incident angle is greater than 56.443°, total reflection occurs at the interface. Therefore, by controlling the refractive indices of the first and second dry particles and adjusting the difference between their refractive indices, light reflected from the high-refractive index dry particles at the irregular interface formed by the high-refractive index second dry particles and the low-refractive index first dry particles can enter the human eye through total internal reflection in the micro-regions, refracted at the interface between the high-refractive index dry particles and air, and thus produce a shimmering effect that varies with viewing angle. Furthermore, after sintering and polishing, the first and second dry particles with different refractive indices have multiple irregular crystal faces and interfaces. When incident with white light, the refractive index varies with wavelength, resulting in decomposition into different colors, creating a dazzling shimmering effect.

[0010] In some embodiments of the present invention, the chemical composition of the first dry particles comprises, by weight percentage: 48.00-50.00% SiO2, 15.00-17.50% Al2O3, 0.01-0.03% Fe2O3, 0.03-0.10% TiO2, 7.50-9.00% CaO, 3.50-4.00% MgO, 3.00-3.50% K2O, 4.00-4.50% Na2O, 0.01-0.05% ZrO2, 1.50-2.50% ZnO, 8.50-9.50% BaO, 1.50-2.00% SrO, 3.00-4.50% B2O3, and a loss on ignition of ≤0.10%. The chemical composition of the first dry particles contains a certain amount of B2O3 with a low refractive index, which helps to reduce the refractive index of the dry particles.

[0011] In some embodiments of the present invention, the particle size of the first dry particles is 200-250 mesh.

[0012] In some embodiments of the present invention, the initial melting temperature of the first dry particles is 1110-1135°C.

[0013] In some embodiments of the present invention, the chemical composition of the second dry particles comprises, by weight percentage: 53.00-55.00% SiO2, 17.00-19.00% Al2O3, 0.01-0.03% Fe2O3, 0.01-0.05% TiO2, 5.50-7.00% CaO, 1.00-2.00% MgO, 3.50-4.50% K2O, 2.50-4.00% Na2O, 0.05-0.10% ZrO2, 2.50-3.00% ZnO, 4.50-5.50% BaO, 3.50-4.50% SrO, 2.50-3.50% La2O3, and a loss on ignition of ≤0.15%. The chemical composition of the second dry particle contains a certain amount of highly refractive La2O3, which helps to increase the refractive index of the dry particle. By adjusting the chemical composition of the first and second dry particles to create a difference in the refractive index of the two dry particles, the shimmering effect of the ceramic tile is further enhanced.

[0014] In some embodiments of the present invention, the particle size of the second dry particles is 80-120 mesh.

[0015] In some embodiments of the present invention, the initial melting temperature of the second dry particles is 1145-1170°C.

[0016] Specifically, light reflection requires a relatively clear interface. Large, high-refractive-index dry particles receive more light at their surface, thereby enhancing the recognition of totally reflected light at different angles and creating a flashing effect over a wider range. Therefore, the present invention controls the particle size of the second, high-refractive-index dry particles to be larger than that of the first, low-refractive-index dry particles, and the initial melting temperature of the second dry particles to be higher than that of the first dry particles. This reduces erosion caused by the reaction between the high-refractive-index surface and the low-refractive-index dry particles, thereby creating a clearer interface, thereby increasing the reflection intensity of light and enhancing the flashing effect.

[0017] In some embodiments of the present invention, in the composite dry particles, the mass ratio of the first dry particles to the second dry particles is (90-95):(5-10).

[0018] The present invention has no special requirements on the raw materials for preparing the green body and the surface glaze layer, and the green body and the surface glaze of ordinary polished glaze tiles can be used for preparation.

[0019] A second aspect of the present invention provides a method for preparing the above-mentioned ceramic tile, comprising the following steps:

[0020] The surface of the green body is sequentially coated with a top glaze, an inkjet printed pattern, a first dry particle glaze and a composite dry particle to form a top glaze layer, a pattern layer, a first glaze layer and a second glaze layer. After drying, the green body is fired in a kiln and polished to obtain the ceramic tile.

[0021] In some embodiments of the present invention, the first dry granular glaze is applied by pouring glaze, and the pouring amount is 200-300g / m 2 The specific gravity of the glaze slurry is 1.55-1.65g / cm 3 The flow rate is 65-75s for 4 cups. The particle size of the first dry particle is relatively fine, and the wet glazing method is used, which is more conducive to the smoothness of the glaze surface.

[0022] In some embodiments of the present invention, the composite dry particles are applied by glue dry method, and the application amount is 250-300g / m 2 The composite dry particles are applied by bonding with glue. The composite dry particles contain both coarse second dry particles and fine first dry particles. The wet glazing method will easily cause the glaze to separate, while the dry glazing method can effectively ensure the uniform distribution of coarse and fine dry particles.

[0023] In some embodiments of the present invention, the maximum firing temperature is 1170-1210° C., and the firing period is 65-70 minutes.

[0024] Compared with the prior art, the above technical solution of the present invention has at least the following technical effects or advantages:

[0025] (1) The present invention controls the microstructure and refractive index of the dry granular glaze layer to construct an interface between a denser medium and a less dense medium, and to form microregions of the denser medium and the less dense medium. When light enters the glaze layer of the ceramic tile, the microregions in the glaze layer can be observed to fully reflect the light by changing the viewing angle, thereby achieving a shimmering effect that changes with the viewing angle of the ceramic tile. Furthermore, by introducing irregular grains with different refractive indices, after firing and polishing, the refractive index of white light changes with wavelength, thereby decomposing the light into different colors, presenting a dazzling shimmering effect.

[0026] (2) The present invention employs a double-layer glaze structure, with a low-refractive-index first dry particle serving as the inner layer and a composite dry particle formed by mixing a high-refractive-index second dry particle with the first dry particle serving as the outer layer. This allows the high-refractive-index dry particles to be completely surrounded by the low-refractive-index dry particles, forming an interface between a denser medium and a less dense medium. After the glaze layer is subsequently fired and polished, not only does the glaze surface serve as a total reflection window for the light source, but the surrounding areas of the high-refractive-index dry particles also form an interface between a denser medium and a less dense medium with the low-refractive-index dry particles, reflecting light entering the glaze layer and thereby enhancing the flashing effect.

[0027] (3) The present invention controls the refractive index of the first dry particle and the second dry particle and adjusts the difference in refractive index between the two to form an irregular interface between the high-refractive index dry particle and the low-refractive index dry particle. For light reflected in the high-refractive index dry particle, it is refracted by the interface between the high-refractive index dry particle and the air through total internal reflection in the micro-region and enters the human eye, thereby observing a flashing effect that changes with different viewing angles. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the examples to facilitate understanding of the present invention by those skilled in the art. It is necessary to point out that the examples are only used to further illustrate the present invention and are not to be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above-mentioned invention should still fall within the scope of protection of the present invention. At the same time, the raw materials mentioned below that are not described in detail are all commercially available products; the process steps or preparation methods that are not mentioned in detail are all process steps or preparation methods known to those skilled in the art.

[0029] The bodies and glazes of the above embodiments and comparative examples are those of ordinary polished glaze tiles.

[0030] Example 1

[0031] A ceramic tile comprises, from bottom to top, a body, a surface glaze layer, a pattern layer, a first glaze layer and a second glaze layer.

[0032] Wherein: the raw material components for preparing the first glaze layer include first dry particles, the raw material components for preparing the second glaze layer include composite dry particles, and the composite dry particles include the first dry particles and the second dry particles in a mass ratio of 95:5.

[0033] The chemical composition of the first dry granules, by weight, includes: 48.34% SiO2, 16.51% Al2O3, 0.02% Fe2O3, 0.05% TiO2, 7.77% CaO, 3.72% MgO, 3.25% K2O, 4.26% Na2O, 0.03% ZrO2, 2.03% ZnO, 8.74% BaO, 1.72% SrO, 3.48% B2O3, and a loss on ignition of 0.08%. The first dry granules have a refractive index of 1.50, an onset melting temperature of 1120°C, and a particle size of 200-250 mesh.

[0034] The chemical composition of the second dry granules, by weight, includes: 53.78% SiO2, 17.34% Al2O3, 0.02% Fe2O3, 0.02% TiO2, 5.73% CaO, 1.55% MgO, 4.08% K2O, 2.82% Na2O, 0.07% ZrO2, 2.86% ZnO, 4.81% BaO, 3.82% SrO, 2.98% La2O3, and a loss on ignition of 0.12%. The second dry granules have a refractive index of 1.87, a melting point of 1158°C, and a particle size of 80-120 mesh.

[0035] The method for preparing the ceramic tile comprises the following steps:

[0036] (1) The first dry particle was wet ball milled to obtain a specific gravity of 1.61 g / cm 3 , apply -4 cups of the first dry glaze slurry at a flow rate of 72s;

[0037] (2) mixing the first dry particles and the second dry particles in a mass ratio to obtain composite dry particles;

[0038] (3) Apply glaze, inkjet print pattern, and pour the first dry granular glaze slurry (the amount of glaze is 210g / m 2 ), by applying composite dry particles with acrylic glue (applying amount is 265g / m 2 ), forming a surface glaze layer, a pattern layer, a first glaze layer and a second glaze layer in sequence, and after drying, firing in a kiln (the maximum firing temperature is 1195°C, the holding time at the maximum temperature is 12 minutes, and the firing cycle is 70 minutes), and polishing (the surface gloss is polished to above 75°) to obtain the ceramic tile of this embodiment.

[0039] Example 2

[0040] A ceramic tile comprises, from bottom to top, a body, a surface glaze layer, a pattern layer, a first glaze layer and a second glaze layer.

[0041] Wherein: the raw material components for preparing the first glaze layer include first dry particles, the raw material components for preparing the second glaze layer include composite dry particles, and the composite dry particles include the first dry particles and the second dry particles in a mass ratio of 90:10.

[0042] The chemical composition of the first dry granules, by weight, includes: 49.13% SiO2, 15.27% Al2O3, 0.02% Fe2O3, 0.06% TiO2, 8.05% CaO, 3.64% MgO, 3.15% K2O, 4.19% Na2O, 0.03% ZrO2, 1.88% ZnO, 8.63% BaO, 1.65% SrO, 4.23% B2O3, and a loss on ignition of 0.07%. The first dry granules have a refractive index of 1.48, a melting point of 1115°C, and a particle size of 200-250 mesh.

[0043] The chemical composition of the second dry granules, by weight, includes: 54.08% SiO2, 17.91% Al2O3, 0.01% Fe2O3, 0.02% TiO2, 5.65% CaO, 1.26% MgO, 3.67% K2O, 2.76% Na2O, 0.06% ZrO2, 2.72% ZnO, 4.63% BaO, 3.65% SrO, 3.43% La2O3, and a loss on ignition of 0.15%. The second dry granules have a refractive index of 1.89, a melting point of 1166°C, and a particle size of 80-120 mesh.

[0044] The method for preparing the ceramic tile comprises the following steps:

[0045] (1) The first dry particle was wet ball milled to obtain a specific gravity of 1.63 g / cm 3 , apply -4 cups of the first dry glaze slurry at a flow rate of 68s;

[0046] (2) mixing the first dry particles and the second dry particles in a mass ratio to obtain composite dry particles;

[0047] (3) Apply glaze, inkjet print pattern, and pour the first dry granular glaze slurry (the amount of glaze is 205g / m 2 ), by applying composite dry particles with acrylic glue (applying amount is 270g / m 2 ), forming a surface glaze layer, a pattern layer, a first glaze layer and a second glaze layer in sequence, and after drying, firing in a kiln (the maximum firing temperature is 1200°C, the holding time at the maximum temperature is 10 minutes, and the firing cycle is 68 minutes), and polishing (the surface gloss is polished to above 75°) to obtain the ceramic tile of this embodiment.

[0048] Example 3

[0049] A ceramic tile comprises, from bottom to top, a body, a surface glaze layer, a pattern layer, a first glaze layer and a second glaze layer.

[0050] Wherein: the raw material components for preparing the first glaze layer include first dry particles, the raw material components for preparing the second glaze layer include composite dry particles, and the composite dry particles include the first dry particles and the second dry particles in a mass ratio of 93:7.

[0051] The chemical composition of the first dry granules, by weight, includes: 48.84% SiO2, 16.13% Al2O3, 0.03% Fe2O3, 0.06% TiO2, 7.85% CaO, 3.74% MgO, 3.16% K2O, 4.11% Na2O, 0.04% ZrO2, 1.78% ZnO, 8.71% BaO, 1.68% SrO, 3.78% B2O3, and a loss on ignition of 0.09%. The first dry granules have a refractive index of 1.46, a melting point of 1113°C, and a particle size of 200-250 mesh.

[0052] The chemical composition of the second dry granules, by weight, includes: 54.05% SiO2, 18.13% Al2O3, 0.02% Fe2O3, 0.01% TiO2, 5.71% CaO, 1.31% MgO, 3.76% K2O, 3.03% Na2O, 0.05% ZrO2, 2.68% ZnO, 4.75% BaO, 3.66% SrO, 2.67% La2O3, and a loss on ignition of 0.17%. The second dry granules have a refractive index of 1.86, a melting point of 1162°C, and a particle size of 80-120 mesh.

[0053] The method for preparing the ceramic tile comprises the following steps:

[0054] (1) The first dry particle was wet ball milled to obtain a specific gravity of 1.58 g / cm 3 , apply -4 cups of the first dry glaze slurry at a flow rate of 74s;

[0055] (2) mixing the first dry particles and the second dry particles in a mass ratio to obtain composite dry particles;

[0056] (3) Apply glaze, inkjet print pattern, and pour the first dry granular glaze slurry (the amount of glaze is 215g / m 2 ), by applying composite dry particles with acrylic glue (applying amount is 265g / m 2 ), forming a surface glaze layer, a pattern layer, a first glaze layer and a second glaze layer in sequence, and after drying, firing in a kiln (the maximum firing temperature is 1195°C, the holding time at the maximum temperature is 10 minutes, and the firing cycle is 68 minutes), and polishing (the surface gloss is polished to above 75°) to obtain the ceramic tile of this embodiment.

[0057] Comparative Example 1

[0058] The difference between Comparative Example 1 and Example 1 is that the layer structure of the ceramic tile is different. The ceramic tile of Comparative Example 1 does not include the first glaze layer, and includes a body, a surface glaze layer, a pattern layer and a second glaze layer from bottom to top.

[0059] Comparative Example 2

[0060] The difference between Comparative Example 2 and Example 1 is that the raw material components for preparing the second glaze layer are different. The raw material components for preparing the second glaze layer in Comparative Example 2 are only the first dry particles, and do not contain the second dry particles.

[0061] Comparative Example 3

[0062] The difference between Comparative Example 3 and Example 1 is that the particle size of the second dry particles in the composite dry particles is different. In the composite dry particles of Comparative Example 3, the particle size of the second dry particles is the same as that of the first dry particles, which is 200-250 mesh.

[0063] Comparative Example 4

[0064] The difference between Comparative Example 4 and Example 1 is that the chemical composition of the second dry particles is different. The chemical composition of the second dry particles in Comparative Example 4 is as follows: 50.47% SiO2, 16.09% Al2O3, 0.02% Fe2O3, 0.02% TiO2, 5.37% CaO, 1.45% MgO, 3.82% K2O, 2.64% Na2O, 0.07% ZrO2, 2.68% ZnO, 4.51% BaO, 3.58% SrO, 9.12% La2O3, and 0.16% loss on ignition.

[0065] Comparative Example 5

[0066] The difference between Comparative Example 5 and Example 1 is that the raw material components for preparing the second glaze layer are different. The raw material components for preparing the second glaze layer in Comparative Example 5 include first dry particles and 80-120 mesh flaky zircon sand, and the mass ratio of the first dry particles to the flaky zircon sand is 97:3.

[0067] Performance Testing

[0068] The ceramic tile samples prepared in Examples 1-3 and Comparative Examples 1-5 were irradiated with monochromatic light and white light from an adequate light source, respectively. The light source was irradiated directly and obliquely onto the tile surface using a camera, and a hemispherical space was captured around the tile surface. The optical phenomena on the tile surface were recorded as the viewing angle changed. The results are shown in Table 1.

[0069] Table 1:

[0070]

[0071] As can be seen from Table 1, for the ceramic tile samples prepared in Examples 1-3, bright flashing spots can be observed on the tile surface under sufficient monochromatic light source and changes in visual angle, presenting a lively flashing effect; and under sufficient white light source and changes in visual angle, not only bright flashing spots appear on the tile surface, but also some of the light spots are accompanied by colored spots, presenting a colorful effect.

[0072] Compared with Example 1, in Comparative Example 1, since the structural layer of the ceramic tile does not contain the first glaze layer, the area around the second dry particles with high refractive index in the glaze layer is a non-light source light incident area (the contact surface between the high refractive index dry particles and the air exposed by the polishing of the glaze layer is the light source light incident area), that is, the high refractive index medium does not form a complete reflection and refraction interface with the low refractive index medium, which reduces the probability of flashing light spots and colored light spots appearing on the brick surface, or even eliminates them.

[0073] Compared to Example 1, in Comparative Example 2, the second glaze layer contained only the first dry particles, without the second dry particles. This meant that the entire glaze layer consisted of a medium with a uniform refractive index, with no interface between a less dense and a less dense medium. Consequently, light from the light source propagated through the glaze without reflection or refraction. Consequently, no flashes of light or colored spots appeared on the brick surface.

[0074] In Comparative Example 3, compared to Example 1, the two dry particles in the second glaze layer have the same fine particle size, resulting in a smaller high-refractive-index region in the glaze layer. This reduces the probability of light passing from a denser medium to a less dense medium. Consequently, only faint flashes of light appear on the brick surface, and the colored spots are also relatively faint.

[0075] Comparative Example 4, compared to Example 1, utilizes conventional opaque crystalline dry particles in the second glaze layer instead of the transparent dry particles of Example 1. After high-temperature firing, the opaque crystalline dry particles form small, opaque crystalline particles within the glaze layer. Light cannot penetrate these particles, instead being directly reflected, forming flashes of light. Furthermore, since light cannot enter the opaque crystal particles, total internal reflection does not occur, and white light cannot be decomposed into different colors, resulting in no colored spots.

[0076] Compared to Example 1, in Comparative Example 5, due to the inclusion of a small amount of flaky zircon sand in the second glaze layer, the zircon sand surface directly reflects both monochromatic and white light, forming bright, flashing spots. Furthermore, zircon sand is an opaque crystal that cannot decompose white light into its various colors, resulting in no colored spots.

[0077] For those skilled in the art to which the present invention belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present invention, without having to resort to creative work. Therefore, based on the disclosure of the present invention, simple improvements made by those skilled in the art to the present invention should be within the scope of protection of the present invention. The above embodiments are preferred embodiments of the present invention, and all processes similar to the present invention and equivalent changes made should fall within the scope of protection of the present invention.

Claims

1. A ceramic tile, characterized in that: From bottom to top, the invention comprises a body, a surface glaze layer, a pattern layer, a first glaze layer and a second glaze layer. The raw material components for preparing the first glaze layer include first dry particles, and the raw material components for preparing the second glaze layer include composite dry particles. The composite dry particles include first dry particles and second dry particles. The refractive index of the first dry particles is between 1.45 and 1.50, and the refractive index of the second dry particles is between 1.85 and 1.

90.

2. The ceramic tile according to claim 1, characterized in that The chemical composition of the first dry particles comprises, by weight percentage, 48.00-50.00% SiO2, 15.00-17.50% Al2O3, 0.01-0.03% Fe2O3, 0.03-0.10% TiO2, 7.50-9.00% CaO, 3.50-4.00% MgO, 3.00-3.50% K2O, 4.00-4.50% Na2O, 0.01-0.05% ZrO2, 1.50-2.50% ZnO, 8.50-9.50% BaO, 1.50-2.00% SrO, 3.00-4.50% B2O3, and a loss on ignition of ≤0.10%.

3. The ceramic tile according to claim 1 or 2, characterized in that: The particle size of the first dry particles is 200-250 mesh; and / or the initial melting temperature of the first dry particles is 1110-1135°C.

4. The ceramic tile according to claim 1, characterized in that The chemical composition of the second dry particles comprises, by weight percentage, 53.00-55.00% SiO2, 17.00-19.00% Al2O3, 0.01-0.03% Fe2O3, 0.01-0.05% TiO2, 5.50-7.00% CaO, 1.00-2.00% MgO, 3.50-4.50% K2O, 2.50-4.00% Na2O, 0.05-0.10% ZrO2, 2.50-3.00% ZnO, 4.50-5.50% BaO, 3.50-4.50% SrO, 2.50-3.50% La2O3, and a loss on ignition of ≤0.15%.

5. The ceramic tile according to claim 1 or 4, characterized in that: The particle size of the second dry particles is 80-120 mesh; and / or the initial melting temperature of the second dry particles is 1145-1170°C.

6. The ceramic tile according to claim 1, characterized in that In the composite dry particles, the mass ratio of the first dry particles to the second dry particles is (90-95):(5-10).

7. A method for preparing a ceramic tile according to any one of claims 1 to 6, characterized in that: The following steps are involved: The surface of the green body is sequentially coated with a top glaze, an inkjet printed pattern, a first dry particle glaze and a composite dry particle to form a top glaze layer, a pattern layer, a first glaze layer and a second glaze layer. After drying, the green body is fired in a kiln and polished to obtain the ceramic tile.

8. The method for preparing ceramic tiles according to claim 7, characterized in that: The first dry granular glaze is applied by pouring glaze, and the pouring amount is 200-300g / m 2 .

9. The method for preparing ceramic tiles according to claim 7, characterized in that: The composite dry particles are applied by glue dry method, with an application amount of 250-300g / m 2 .

10. The method for preparing ceramic tiles according to claim 7, characterized in that: The maximum firing temperature is 1170-1210° C., and the firing cycle is 65-70 minutes.

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