Light-transmitting powder, gradient light-transmitting ceramic tile and preparation method of gradient light-transmitting ceramic tile

Abstract

The invention relates to the field of architectural ceramics, and discloses light-transmitting powder, a gradually-changed light-transmitting ceramic tile and a preparation method of the gradually-changed light-transmitting ceramic tile. The light-transmitting powder comprises the following raw materials in parts by weight: 50-70 parts of nepheline syenite, 10-15 parts of superfine quartz, 10-20 parts of kaolin, 3-8 parts of barium carbonate, 5-10 parts of wollastonite, 3-5 parts of yttrium aluminum garnet and 2-4 parts of magnesium aluminate spinel. By adopting the formula, the light-transmitting green body which is high in light transmittance, stable in light transmittance and uniform in light transmittance can be prepared by compounding multiple components, and a good foundation is provided for preparing a ceramic tile with full-transparent jade texture.

Description

Technical Field

[0001] This invention relates to the field of building ceramics, and in particular to a translucent powder, a gradient translucent ceramic brick, and a method for preparing the same. Background Technology

[0002] As a widely used floor and wall decoration material, the development of ceramic tiles is closely linked to the changing aesthetic preferences of the consumer market. With the improvement of people's living standards and the increasing diversification of decorative aesthetic demands, consumers are no longer satisfied with the basic functional use of ceramic tiles, but are placing higher demands on their decorative, artistic, and spatial atmosphere-creating capabilities. Against this backdrop, natural stone, with its naturally formed textures, rich color variations, and unique feel, has long been regarded as a model of high-end decorative materials, possessing an irreplaceable natural beauty.

[0003] To meet market demand and overcome the limitations of natural stone, such as resource scarcity, high price, defects in physical properties (e.g., strength, wear resistance, stain resistance), and potential radioactive risks, the tile industry is actively committed to developing new tile products that can simulate the visual effects of natural stone. Among these, marble tiles have become one of the mainstream products in the market, successfully reproducing the texture and color of natural marble to a large extent.

[0004] However, within the vast system of natural stone, jade-like materials stand out for their warm texture, complex internal color patterns, profound layering, and unique gradient translucency, making them particularly precious and mysterious. Developing corresponding ceramic tile products that mimic the essence of jade has become a technological high ground in the industry. These jade-like ceramic tiles not only require realistic surface patterns, but the core challenge lies in reproducing the soft, gradient rainbow color effect created when light penetrates the stone, ensuring that the internal texture remains clear, three-dimensional, and layered even under translucent conditions.

[0005] In existing technologies, to achieve the light-transmitting effect of ceramic tiles, the common methods are: using raw materials with good light transmittance (such as transparent or translucent glazes, and body bodies with high glass phase content), or reducing the thickness of the tile body, or creating through holes or grooves in the body. For example, some ultra-thin slabs or products with special composite structures have a certain degree of light transmittance. However, these existing technical solutions have obvious limitations: First, their light transmittance effect is often uniform and rigid, making it difficult to simulate the "gradual" light transmittance of natural jade, which transitions naturally from the center outwards or along the texture; second, while achieving light transmittance, the printed or inkjet patterns on the tile surface usually remain on the surface layer, disconnected from the internal light-transmitting structure, resulting in a weakened sense of three-dimensionality and layering of the pattern when light is transmitted, or even making it blurry, failing to form a realistic texture that echoes the inside and outside and blends seamlessly.

[0006] Therefore, existing technologies cannot effectively solve the problem of synergistically achieving "gradient light transmission" and "three-dimensional texture layers." How to simultaneously realize a natural and soft gradient light transmission effect, similar to that of natural jade, and a perfectly integrated, clear, and three-dimensional internal texture within a single ceramic tile product has become a key technical challenge that urgently needs to be overcome by those skilled in the art. This also restricts the development and market promotion of high-end imitation jade ceramic tile products. Summary of the Invention

[0007] The main objective of this invention is to provide a translucent powder, a gradient translucent ceramic brick, and a method for preparing the same, in order to solve the aforementioned technical problems.

[0008] To achieve the above objectives, in a first aspect, the present invention proposes a light-transmitting powder comprising the following raw materials by weight: 50-70 parts of nepheline syenite, 10-15 parts of ultrafine quartz, 10-20 parts of kaolinite, 3-8 parts of barium carbonate, 5-10 parts of wollastonite, 3-5 parts of yttrium aluminum garnet, and 2-4 parts of magnesium aluminum spinel.

[0009] The present invention uses the above formula to prepare a translucent body with high light transmittance, stable light transmittance, and uniform light transmittance by compounding multiple components, which provides a good foundation for preparing ceramic tiles with a fully translucent jade texture.

[0010] Preferably, the glass phase content of the light-transmitting powder after firing is 45-62%, the porosity is <2%, the light transmittance is 0.5-1.1%, and the whiteness is 75-90. The light transmittance of the present invention is obtained by the light transmittance detection method in the published patent CN112285069A, entitled "A Method for Detecting the Light Transmittance of Light-Transmitting Ceramic and an Optical Density Meter Device".

[0011] Preferably, the particle size of the ultrafine quartz is D90 < 30 μm. More preferably, D90 < 15 μm. Smaller particle size quartz can promote solid-state reactions during firing, reduce residual crystals, and reduce light scattering. When combined with yttrium aluminum garnet and magnesium aluminum spinel, it can significantly enhance the light transmittance and light transmittance stability of the green body, while also increasing its hardness, wear resistance, and corrosion resistance.

[0012] Secondly, this invention proposes a method for preparing gradient translucent ceramic tiles, comprising the following steps: S11. Prepare any of the light-transmitting powders as described above, and lay a layer of the light-transmitting powders flat through the bottom to form a first light-transmitting powder layer; S12. Mix the light-transmitting powder with the colorant to prepare at least two colors of monochrome light-transmitting powder, and apply it according to a pre-set texture pattern to form a three-dimensional texture layer. S13. A second layer of translucent powder is applied on the three-dimensional texture layer to form a second translucent powder layer; after being smoothed, it is rolled and formed to produce a gradient translucent blank. S2. Print a pattern layer on the gradient translucent blank according to a preset pattern; S3, Apply protective glaze; S4. After firing, the gradient translucent ceramic tile is obtained by brushing, polishing and grinding the edges. The three-dimensional texture layer comprises at least a portion of two or more different monochromatic translucent powders layered from bottom to top.

[0013] This invention uses the above-mentioned formula of translucent powder to form a unique gradient translucent texture layer in a three-dimensional fabric with various monochrome translucent powders. The translucent properties of the fired body of the translucent powder are uniform and stable, which imitates the gradient translucent effect of natural jade and achieves three-dimensional unity between the surface printing and the internal translucent structure.

[0014] Preferably, step S121 is further included between step S12 and step S13: applying a layer of light-shielding glaze on the three-dimensional texture layer; the thickness of the light-shielding glaze layer is 0.5~1mm; adding a layer of light-shielding glaze adjusts the actual light transmittance of each color layer, making the texture inside the body complex and varied under light, and giving it a more three-dimensional sense of layering.

[0015] The chemical composition of the light-shielding glaze, by mass percentage of oxides, includes: SiO2 61~67%, Al2O3 17~20%, CaO 0.03~1%, MgO 0.02~0.3%, K2O 0.3~0.6%, Na2O 2.5~3%, BaO 0.03~1%, P2O5 0.03~1%, ZrO2 3~7%, and LOI 3~6%.

[0016] More preferably, the chemical composition of the light-shielding glaze, by mass percentage of oxides, includes: 64.38% SiO2, 18.59% Al2O3, 0.42% CaO, 0.1% MgO, 0.58% K2O, 2.88% Na2O, 0.68% BaO, 0.68% P2O5, 6.82% ZrO2, and 4.87% LOI.

[0017] Preferably, the raw materials of the protective glaze, by weight, include: 7-13 parts of sodium feldspar, 28-45 parts of potassium feldspar, 8-15 parts of quartz, 5-12 parts of calcium phosphate, 3-7 parts of zinc oxide, 5-8 parts of calcined kaolin, 13-28 parts of dolomite, and 2-4 parts of diopside.

[0018] Preferably, the thickness of the first translucent powder layer is 7-10 mm.

[0019] Preferably, the thickness of the three-dimensional texture layer is 2~10mm.

[0020] Preferably, the thickness of the second translucent powder layer is 1~4mm.

[0021] Preferably, in step S4, the firing temperature is 1180~1230℃ and the firing time is 70~85min.

[0022] Thirdly, the present invention also provides a gradient translucent ceramic tile, which is prepared by any of the gradient translucent ceramic tile preparation methods described above.

[0023] Compared with existing technologies, the present invention has the following advantages: the translucent powder provided by the present invention has stable performance, and the fired body has high light transmittance and uniform and stable light transmittance. The gradient translucent ceramic tiles made with this translucent powder have clear and three-dimensional texture layers, and under light penetration, they present a natural and realistic gradient translucent texture effect like jade, enhancing the product's sense of layering and three-dimensionality, and meeting the demand of the high-end market for fully translucent gradient texture decoration. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a photograph of the ceramic tile prepared in Example 4 under natural light. Figure 2 This is a photograph of the ceramic tile prepared in Example 4 under transmitted light. Figure 3 This is a photograph of the ceramic tile prepared in Example 5 under transmitted light. The realization of the purpose, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. At the same time, the raw materials mentioned below, unless otherwise specified, are all commercially available products; the process steps or preparation methods not mentioned in detail are all process steps or preparation methods known to those skilled in the art.

[0027] This embodiment discloses a method for preparing gradient translucent ceramic tiles, including the following steps: S11. Prepare a translucent powder, wherein the raw materials for the translucent powder, by weight, include: 50-70 parts of nepheline syenite, 10-15 parts of ultrafine quartz, 10-20 parts of kaolin, 3-8 parts of barium carbonate, 5-10 parts of wollastonite, 3-5 parts of yttrium aluminum garnet, and 2-4 parts of magnesium aluminum spinel. A layer of translucent powder is laid flat across the bottom to form the first translucent powder layer; the thickness of the powder layer is 7-10 mm.

[0028] S12. The light-transmitting powder and colorant are mixed to prepare at least two colors of monochrome light-transmitting powder, which is then applied according to a pre-set texture pattern to form a three-dimensional texture layer; the thickness of the applied powder is 2~10 mm; at least a portion of the three-dimensional texture layer includes two or more different colors of monochrome light-transmitting powder superimposed from bottom to top.

[0029] S13. Apply another layer of translucent powder on the three-dimensional textured layer to form a second translucent powder layer; the thickness of the powder layer is 1~4 mm. After smoothing, roll-press to form a gradient translucent blank; S2. Print a pattern layer on the gradient translucent blank according to a preset pattern; S3. Apply protective glaze; the raw materials of the protective glaze, by weight, include: 7-13 parts sodium feldspar, 28-45 parts potassium feldspar, 8-15 parts quartz, 5-12 parts calcium phosphate, 3-7 parts zinc oxide, 5-8 parts calcined kaolin, 13-28 parts dolomite, and 2-4 parts diopside.

[0030] S4. After firing, the firing temperature is 1180~1230℃, and the firing time is 70~85min. After brushing, polishing, and edge grinding, the gradient translucent ceramic tile is obtained.

[0031] This invention employs translucent powder and various monochromatic translucent powders through multi-channel three-dimensional fabrication to create a unique gradient translucent texture in the ceramic body. In some preferred embodiments, the glass phase content of the translucent powder after firing is 45-62%, the porosity is <2%, the light transmittance is 0.5-1.1%, and the whiteness is 75-90. The superposition of multiple colors within the ceramic body creates differences in light transmittance in different areas, thereby creating a jade-like layered effect with transitional colors and overlapping shadows. It should be noted that the light transmittance described in this invention is obtained using the light transmittance detection method published in patent CN112285069A, entitled "A Method for Detecting the Light Transmittance of Translucent Ceramic and an Optical Density Meter Device." The colorant in step S12 can be a known ceramic colorant.

[0032] In some preferred embodiments, the particle size of the ultrafine quartz is D90 < 30 μm. More preferably, D90 < 15 μm.

[0033] In the light-transmitting powder used in this invention, yttrium aluminum garnet (YAG) has a microstructure composed of pure, isotropic YAG grains, belonging to the cubic crystal system. Its refractive index is the same in all directions, significantly enhancing the light transmittance of the green body. Magnesium aluminum spinel exhibits high light transmittance across a wide wavelength range from ultraviolet to mid-infrared, with a wider transmission range than YAG. It also belongs to the isotropic cubic crystal system, and its grain boundaries do not scatter light, enhancing light transmittance while providing high hardness and high wear and corrosion resistance. The combination of fine-grained quartz with YAG and magnesium aluminum spinel helps the crystal interfaces fuse, promotes solid-phase reactions during firing, reduces residual crystals, reduces light scattering, and makes the light transmittance of the green body more uniform.

[0034] It should be noted that the various monochromatic translucent powders of this invention, combined with the fabric application effect, achieve both horizontal layering and vertical extension. Each layer of monochromatic translucent powder forms a transverse mesh structure during the application process, while the application areas of different monochromatic translucent powders exhibit staggered layering, thus extending vertically upwards in a columnar shape, penetrating part of the blank and intersecting with the horizontally layered structure. The different monochromatic translucent powders form a secondary mixing and three-dimensional encapsulation, reducing the sense of boundary at the edges, preventing obvious interface abrupt changes during light propagation, and enhancing the scattering path. Furthermore, the color thickness gradients formed by each monochromatic translucent powder are different, and the inherent absorption coefficients of the superimposed monochromatic translucent powders also differ. The translucent powder, as the bottom layer, establishes an optical window, introducing more light sources into the intermediate three-dimensional texture layer. Due to the difference in refractive index of the different monochromatic materials in the three-dimensional texture layer, continuous micro-refraction occurs between layers rather than sharp abrupt changes, forming a three-dimensional refractive index gradient structure. Ultimately, the gradient transitions from planar to three-dimensional, presenting a floating, interwoven three-dimensional depth, accurately mimicking the intricate network of veins within natural jade. This invention achieves a gradual transition of light and dark areas by adjusting the three corresponding relationships of "thickness, light absorption, and light transmittance" in the body layer, thus mimicking the natural transition of light and dark textures formed by the uneven distribution of mineral content inside natural jade.

[0035] In some preferred embodiments, a light-shielding glaze can also be disposed between the three-dimensional texture layer and the second translucent powder layer. Specifically, step S121 can be included between steps S12 and S13: applying a light-shielding glaze layer on the three-dimensional texture layer; the thickness of the light-shielding glaze layer is 0.5~1mm; the chemical composition of the light-shielding glaze, in terms of the mass percentage of oxides, includes: SiO2 61~67%, Al2O3 17~20%, CaO 0.03~1%, MgO 0.02~0.3%, K2O 0.3~0.6%, Na2O 2.5~3%, BaO 0.03~1%, P2O5 0.03~1%, ZrO2 3~7%, and LOI 3~6%. More preferably, the chemical composition of the light-shielding glaze, by mass percentage of oxides, includes: 64.38% SiO2, 18.59% Al2O3, 0.42% CaO, 0.1% MgO, 0.58% K2O, 2.88% Na2O, 0.68% BaO, 0.68% P2O5, 6.82% ZrO2, and 4.87% LOI.

[0036] This light-blocking glaze achieves a certain light-blocking effect by controlling the glaze composition. The three-dimensional texture layer is formed by layering various monochrome materials in a staggered manner, while the light-blocking glaze is applied to the uneven surface created by these different monochrome materials. Because different monochrome areas exhibit different light refraction, reflection, and scattering effects after firing, the presence of the light-blocking glaze, combined with the uneven edges between the monochrome material layers, creates more complex changes in the light path, macroscopically simulating the complex light and shadow variations and sense of weight within natural jade.

[0037] It should be noted that the preset images for the 3D texture layer and the pattern layer can be the same design, or, as needed, partially misaligned design images can be used to create a visual effect with embellished translucent patterns.

[0038] The following examples further illustrate the present invention in detail. It should also be understood that the following examples are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters in the following examples are merely one example within a suitable range; that is, those skilled in the art can make appropriate selections within the range based on the description herein, and are not intended to be limited to the specific values ​​in the examples below. Where specific conditions are not specified in the examples, conventional conditions or conditions recommended by the manufacturer shall apply.

[0039] It should be noted that the colorant mentioned in step S12 is a ceramic colorant known in the art. Furthermore, the three-dimensional textured layer described in this solution is not limited to the fabric application method in the following embodiments. Those skilled in the art can configure various different colors of monochromatic translucent powder and apply different preset patterns according to actual needs, all of which fall within the scope of protection of this invention.

[0040] Example 1 Only translucent powder was used for the fabric application. The raw materials of the translucent powder, by weight, included: 50 parts nepheline syenite, 15 parts ultrafine quartz (D90 < 30), 15 parts kaolin, 6 parts barium carbonate, 7 parts wollastonite, 3 parts yttrium aluminum garnet, and 4 parts magnesium aluminum spinel. The application thickness was 9 mm, and the mixture was fired at 1180℃ for 73 min to produce a translucent blank.

[0041] Example 2 Only translucent powder was used for the fabric application. The raw materials of the translucent powder, by weight, included: 56 parts nepheline syenite, 12 parts ultrafine quartz (D90 < 15), 15 parts kaolin, 5 parts barium carbonate, 5 parts wollastonite, 4 parts yttrium aluminum garnet, and 3 parts magnesium aluminum spinel. The application thickness was 9 mm, and the mixture was fired at 1180℃ for 73 min to produce a translucent blank.

[0042] Example 3 Only translucent powder was used for the fabric application. The raw materials of the translucent powder, by weight, included: 61 parts nepheline syenite, 10 parts ultrafine quartz (D90 < 30), 13 parts kaolin, 3 parts barium carbonate, 6 parts wollastonite, 5 parts yttrium aluminum garnet, and 2 parts magnesium aluminum spinel. The application thickness was 9 mm, and the mixture was fired at 1180℃ for 73 min to produce a translucent blank.

[0043] Comparative Example 1 Only translucent powder was used for the fabric application. The raw materials of the translucent powder, by weight, included: 56 parts nepheline syenite, 12 parts quartz (D90 > 30), 15 parts kaolin, 5 parts barium carbonate, 5 parts wollastonite, 4 parts yttrium aluminum garnet, and 3 parts magnesium aluminum spinel. The application thickness was 9 mm, and the mixture was fired at 1180℃ for 73 min to produce a translucent blank.

[0044] Comparative Example 2 Only translucent powder was used for the fabric application. The raw materials of the translucent powder, by weight, included: 58 parts nepheline syenite, 12 parts ultrafine quartz (D90 < 15), 17 parts kaolin, 5 parts barium carbonate, 5 parts wollastonite, and 3 parts magnesium aluminum spinel. The application thickness was 9 mm, and the mixture was fired at 1180℃ for 73 min to produce a translucent blank.

[0045] Comparative Example 3 Only translucent powder was used for the fabric application. The raw materials of the translucent powder, by weight, included: 58 parts nepheline syenite, 12 parts ultrafine quartz (D90 < 15), 16 parts kaolin, 5 parts barium carbonate, 5 parts wollastonite, and 4 parts yttrium aluminum garnet. The application thickness was 9 mm, and the mixture was fired at 1180℃ for 73 min to produce a translucent blank.

[0046] Comparative Example 4 Only translucent powder was used for the fabric application. The raw materials of the translucent powder, by weight, included: 58 parts nepheline syenite, 13 parts ultrafine quartz (D90 < 15), 17 parts kaolin, 5 parts barium carbonate, 4 parts wollastonite, 2 parts yttrium aluminum garnet, and 1 part magnesium aluminum spinel. The application thickness was 9 mm, and the mixture was fired at 1180℃ for 73 min to produce a translucent blank.

[0047] The translucent blanks fired in Examples 1-3 and Comparative Examples 1-4 were each divided into 9 regions, and the light transmittance of each region was measured. The light transmittance measurement method was the "A Method for Detecting the Light Transmittance of Translucent Ceramics" disclosed in patent CN112285069A. The measurement results are shown in Table 1.

[0048] Table 1. Light transmittance of the translucent blanks fired in Examples 1-3 and Comparative Examples 1-4 (unit: %) As shown in Table 1, the translucent green bodies of Examples 1-3 have high light transmittance, and the light transmittance of each region is uniform and stable. Among them, Example 2 shows the best results. Comparative Example 1 uses conventional quartz with excessively large particle size; Comparative Example 2 does not add yttrium aluminum garnet; Comparative Example 3 does not add magnesium aluminum spinel; and Comparative Example 4 adjusts the amount of each component. The light transmittance of the translucent green bodies obtained after firing all show a decrease, and the light transmittance is unstable.

[0049] The glass phase content, porosity, and whiteness of the translucent preforms obtained in Examples 1-3 were tested. The test results are shown in Table 2.

[0050] Table 2. Glass phase content, porosity, and whiteness of the translucent preforms obtained in Examples 1-3 Gradient translucent ceramic tiles were prepared using the translucent powder of this invention. All colorants were purchased from Qunyi Ceramic Raw Materials Co., Ltd. Specifically, the monochromatic translucent powders used in the following embodiments are shown in Table 3.

[0051] Table 3 Example 4 A method for preparing a gradient translucent ceramic tile includes the following steps: S11. Prepare a translucent powder, wherein the raw materials of the translucent powder, by weight, include: 56 parts nepheline syenite, 12 parts ultrafine quartz (D90 < 15 μm), 15 parts kaolin, 5 parts barium carbonate, 5 parts wollastonite, 4 parts yttrium aluminum garnet, and 3 parts magnesium aluminum spinel. A layer of translucent powder is laid flat across the bottom to form the first translucent powder layer; the thickness of the powder layer is 7.95 mm.

[0052] S12. Take the monochrome translucent powders of different colors in Table 1, and partially layer them according to the pre-set texture pattern to form a three-dimensional texture layer; the thickness of the powder is 2~6mm.

[0053] S13. Apply another layer of translucent powder on the three-dimensional textured layer to form a second translucent powder layer; the thickness of the powder layer is 3-4 mm. After smoothing, roll-press to form a gradient translucent blank. S2. Print a pattern layer on the gradient translucent blank according to a preset pattern; S3. Apply protective glaze; the raw materials of the protective glaze, by weight, include: 10 parts sodium feldspar, 35 parts potassium feldspar, 12 parts quartz, 8 parts calcium phosphate, 5 parts zinc oxide, 7 parts calcined kaolin, 20 parts dolomite, and 3 parts diopside.

[0054] S4. After firing at 1180℃ for 73 minutes, the gradient translucent ceramic tile is obtained by brushing, polishing and grinding the edges.

[0055] Example 5 A method for preparing a gradient translucent ceramic tile includes the following steps: S11. Prepare a translucent powder, wherein the raw materials of the translucent powder, by weight, include: 56 parts nepheline syenite, 12 parts ultrafine quartz (D90 < 15 μm), 15 parts kaolin, 5 parts barium carbonate, 5 parts wollastonite, 4 parts yttrium aluminum garnet, and 3 parts magnesium aluminum spinel. A layer of translucent powder is laid flat across the bottom to form the first translucent powder layer; the thickness of the powder layer is 7.95 mm.

[0056] S12. Take the monochrome translucent powders of different colors in Table 1, and partially layer them according to the pre-set texture pattern to form a three-dimensional texture layer; the thickness of the powder is 2~6 mm.

[0057] S121. Apply a layer of light-shielding glaze to the three-dimensional textured layer; the thickness of the light-shielding glaze layer is 0.8 mm; the chemical composition of the light-shielding glaze, in terms of the mass percentage of oxides, includes: SiO2 64.38%, Al2O3 18.59%, CaO 0.42%, MgO 0.1%, K2O 0.58%, Na2O 2.88%, BaO 0.68%, P2O5 0.68%, ZrO2 6.82%, and LOI 4.87%.

[0058] S13. Apply a layer of translucent powder on the light-blocking glaze layer to form a second translucent powder layer; the powder thickness is 3-4 mm. After smoothing, roll-press to form a gradient translucent blank. S2. Print a pattern layer on the gradient translucent blank according to a preset pattern; S3. Apply protective glaze; the raw materials of the protective glaze, by weight, include: 10 parts sodium feldspar, 33 parts potassium feldspar, 13 parts quartz, 9 parts calcium phosphate, 5 parts zinc oxide, 8 parts calcined kaolin, 18 parts dolomite, and 4 parts diopside.

[0059] S4. After firing at 1180℃ for 73 minutes, the gradient translucent ceramic tile is obtained by brushing, polishing and grinding the edges.

[0060] Example 6 A method for preparing a gradient translucent ceramic tile includes the following steps: S11. Prepare a translucent powder, wherein the raw materials of the translucent powder, by weight, include: 50 parts nepheline syenite, 15 parts ultrafine quartz (D90 < 30 μm), 15 parts kaolin, 6 parts barium carbonate, 7 parts wollastonite, 3 parts yttrium aluminum garnet, and 4 parts magnesium aluminum spinel. A layer of translucent powder is laid flat across the bottom to form the first translucent powder layer; the thickness of the powder layer is 7.95 mm.

[0061] S12. Take the monochrome translucent powders of different colors in Table 1, and partially layer them according to the pre-set texture pattern to form a three-dimensional texture layer; the thickness of the powder is 2~6mm.

[0062] S121. Apply a layer of light-shielding glaze to the three-dimensional textured layer; the thickness of the light-shielding glaze layer is 0.7 mm; the chemical composition of the light-shielding glaze, in terms of the mass percentage of oxides, includes: SiO2 64.38%, Al2O3 18.59%, CaO 0.42%, MgO 0.1%, K2O 0.58%, Na2O 2.88%, BaO 0.68%, P2O5 0.68%, ZrO2 6.82%, and LOI 4.87%.

[0063] S13. Apply a layer of translucent powder on the light-blocking glaze layer to form a second translucent powder layer; the powder thickness is 3-4 mm. After smoothing, roll-press to form a gradient translucent blank. S2. Print a pattern layer on the gradient translucent blank according to a preset pattern; S3. Apply protective glaze; the raw materials of the protective glaze, by weight, include: 12 parts sodium feldspar, 34 parts potassium feldspar, 10 parts quartz, 10 parts calcium phosphate, 6 parts zinc oxide, 7 parts calcined kaolin, 16 parts dolomite, and 4 parts diopside.

[0064] S4. After firing at 1180℃ for 73 minutes, the gradient translucent ceramic tile is obtained by brushing, polishing and grinding the edges.

[0065] Example 7 A method for preparing a gradient translucent ceramic tile includes the following steps: S11. Prepare a translucent powder, wherein the raw materials of the translucent powder, by weight, include: 61 parts nepheline syenite, 10 parts ultrafine quartz (D90 < 30 μm), 13 parts kaolinite, 3 parts barium carbonate, 6 parts wollastonite, 5 parts yttrium aluminum garnet, and 2 parts magnesium aluminum spinel. A layer of translucent powder is laid flat across the bottom to form the first translucent powder layer; the thickness of the powder layer is 7.95 mm.

[0066] S12. Take the monochrome translucent powders of different colors in Table 1, and partially layer them according to the pre-set texture pattern to form a three-dimensional texture layer; the thickness of the powder is 2~6 mm.

[0067] S121. Apply a layer of light-shielding glaze to the three-dimensional textured layer; the thickness of the light-shielding glaze layer is 0.7 mm; the chemical composition of the light-shielding glaze, in terms of the mass percentage of oxides, includes: SiO2 64.38%, Al2O3 18.59%, CaO 0.42%, MgO 0.1%, K2O 0.58%, Na2O 2.88%, BaO 0.68%, P2O5 0.68%, ZrO2 6.82%, and LOI 4.87%.

[0068] S13. Apply a layer of translucent powder on the light-blocking glaze layer to form a second translucent powder layer; the powder thickness is 3-4 mm. After smoothing, roll-press to form a gradient translucent blank. S2. Print a pattern layer on the gradient translucent blank according to a preset pattern; S3. Apply protective glaze; the raw materials of the protective glaze, by weight, include: 12 parts sodium feldspar, 32 parts potassium feldspar, 13 parts quartz, 10 parts calcium phosphate, 5 parts zinc oxide, 7 parts calcined kaolin, 17 parts dolomite, and 4 parts diopside.

[0069] S4. After firing at 1180℃ for 73 minutes, the gradient translucent ceramic tile is obtained by brushing, polishing and grinding the edges.

[0070] like Figure 1 and Figure 2 As shown, the ceramic tile prepared in Example 4 exhibits different visual effects under natural light and under light penetration. Under light penetration, it breaks through the simple planar effect and simulates the three-dimensional layering of jade's translucency and gradient. Figure 2 The ceramic tiles lack a light-blocking glaze, resulting in an overall yellowish tint when light shines through them. For example... Figure 3 As shown, the ceramic tile of Example 5, although using the same preset pattern for fabric application as Example 4, exhibits a richer, more profound color and a more three-dimensional visual effect under transmitted light due to the application of a light-blocking glaze. It should be noted that, because the same preset pattern layer is used, the glaze effect of the ceramic tile of Example 5 under natural light is the same as that of the ceramic tile of Example 4. The difference in visual effect is only observed under transmitted light.

[0071] The ceramic tiles prepared in Examples 4-7 were subjected to performance testing. The testing methods and standards are as follows: 1. Glaze effect under natural light: The surface effect of the tile as observed by the naked eye under natural light.

[0072] 2. Glaze effect under light penetration: Shine light on the back of the tile and observe the surface effect of the tile under this condition with the naked eye.

[0073] 3. Abrasion resistance: Abrasion resistance is tested according to GB / T 3810.7-2016: observe the wear of the brick surface after grinding at a specific number of grinding revolutions, and classify it into 0-5 levels. Among them, visible wear after 100 revolutions is level 0, visible wear after 150 revolutions is level 1, visible wear after 600 revolutions is level 2, visible wear after 750 / 1500 revolutions is level 3, visible wear after 2100 / 6000 / 12000 revolutions is level 4, and visible wear after more than 12000 revolutions is level 5.

[0074] The test results are shown in Table 4.

[0075] Table 4 Performance test results of ceramic tiles prepared in Examples 4-7 As shown in Table 4, the ceramic tiles prepared in Examples 4 to 7 exhibit a jade-like translucency and warmth under natural light. Under light penetration, the sample effect is rich in color, has a strong three-dimensional effect, and good translucency.

[0076] Taking Example 5 as an example, the light transmittance at various points on the surface of the tile was tested. The testing standards and methods are as follows: Transmittance test: The ceramic tile of Example 5 was divided into 18 regions along the long side of the tile and numbered from 1 to 18. The transmittance of different color blocks in the regions numbered 1, 3, 5, 7, 9, 11, 13, 15 and 17 was tested.

[0077] The test results are shown in Table 5.

[0078] Table 5. Light transmittance of ceramic tiles prepared in Example 5 at various locations (unit: %) Note: " / " indicates that there is no corresponding color block in the area for measuring transmittance; multiple data points indicate that there are multiple transmittance measurements for the area with corresponding color blocks.

[0079] As shown in Table 5, the light transmittance of the entire brick varies greatly, ranging from 0.11 to 0.94, with different transmittance ranges depending on the distribution of different monochrome materials. Furthermore, the complex internal three-dimensional texture creates variations in light penetration; even blocks of the same color exhibit subtle changes in transmittance, avoiding a harsh, uniform appearance and allowing for natural transitions between light and dark areas. The absence of abrupt interface changes during light propagation enhances the scattering path.

[0080] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A translucent powder, characterized in that, The light-transmitting powder comprises the following raw materials by weight: 50-70 parts of nepheline syenite, 10-15 parts of ultrafine quartz, 10-20 parts of kaolin, 3-8 parts of barium carbonate, 5-10 parts of wollastonite, 3-5 parts of yttrium aluminum garnet, and 2-4 parts of magnesium aluminum spinel.

2. The light-transmitting powder as described in claim 1, characterized in that, The light-transmitting powder, after sintering, has a glass phase content of 45-62%, a porosity of <2%, a light transmittance of 0.5-1.1%, and a whiteness of 75-90.

3. The light-transmitting powder as described in claim 1, characterized in that, The particle size of the ultrafine quartz is D90 < 30 μm.

4. A method for preparing a gradient translucent ceramic tile, characterized in that, Includes the following steps: S11. Prepare the light-transmitting powder as described in any one of claims 1 to 3, and lay a layer of the light-transmitting powder flat through the bottom to form a first light-transmitting powder layer; S12. Mix the light-transmitting powder with the colorant to prepare at least two colors of monochrome light-transmitting powder, and apply it according to a pre-set texture pattern to form a three-dimensional texture layer. S13. A second layer of translucent powder is applied on the three-dimensional texture layer to form a second translucent powder layer; after being smoothed, it is rolled and formed to produce a gradient translucent blank. S2. Print a pattern layer on the gradient translucent blank according to a preset pattern; S3, Apply protective glaze; S4. After firing, the gradient translucent ceramic tile is obtained by brushing, polishing and grinding the edges. The three-dimensional texture layer comprises at least a portion of two or more different monochromatic translucent powders layered from bottom to top.

5. The method for preparing a gradient translucent ceramic tile as described in claim 4, characterized in that, Between steps S12 and S13, there is also step S121: applying a layer of light-shielding glaze to the three-dimensional texture layer; the thickness of the light-shielding glaze layer is 0.5~1mm; The chemical composition of the light-shielding glaze, by mass percentage of oxides, includes: SiO2 61~67%, Al2O3 17~20%, CaO 0.03~1%, MgO 0.02~0.3%, K2O 0.3~0.6%, Na2O 2.5~3%, BaO 0.03~1%, P2O5 0.03~1%, ZrO2 3~7%, and LOI 3~6%.

6. The method for preparing a gradient translucent ceramic tile as described in claim 4, characterized in that, The raw materials of the protective glaze, by weight, include: 7-13 parts of sodium feldspar, 28-45 parts of potassium feldspar, 8-15 parts of quartz, 5-12 parts of calcium phosphate, 3-7 parts of zinc oxide, 5-8 parts of calcined kaolin, 13-28 parts of dolomite, and 2-4 parts of diopside.

7. The method for preparing a gradient translucent ceramic tile as described in claim 4, characterized in that, The thickness of the first translucent powder layer is 7~10 mm.

8. The method for preparing a gradient translucent ceramic tile as described in claim 4, characterized in that, The thickness of the three-dimensional texture layer is 2~10mm.

9. The method for preparing a gradient translucent ceramic tile as described in claim 4, characterized in that, The thickness of the second translucent powder layer is 1~4mm.

10. A gradient translucent ceramic tile, characterized in that, The ceramic tile was prepared using the method described in any one of claims 4 to 9.

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