Colorful metal glaze, preparation method thereof and ceramic product

Abstract

The invention provides colorful metal glaze, a preparation method thereof and a ceramic product, and belongs to the technical field of ceramic materials. The colorful metal glaze comprises basic glaze, a nano composite nucleating agent, a metal coloring agent and a rare earth toner, the nano composite nucleation agent is a nano particle with a core-shell structure. The ceramic product prepared by the invention has stable, uniform and strong metallic luster and lasting color, not only solves the problems of strong color development dependence, insufficient glaze surface stability, poor component synergism and the like of the existing metal glaze, but also improves the quality and artistic value of the ceramic product, and has wide market application prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic materials, in particular to a colorful metal glaze and a preparation method thereof and a ceramic product. BACKGROUND

[0002] Glaze is generally a layer of glassy thin layer of protective film formed on the surface of ceramic products by taking quartz, feldspar, clay and the like as raw materials, grinding, adjusting, applying glaze and sintering and the like. The glaze layer on the surface of the ceramic product can not only enhance the physical properties such as mechanical strength and thermal stability of the ceramic, but also enhance the appearance of the ceramic product and facilitate the cleaning of the surface of the ceramic product. Metal glaze is a special artistic glaze in the glaze of the ceramic industry, which is a special glaze allowing the glaze to refract a metallic luster and having a strong glass phase. The surface of the ceramic product applied with the metal glaze presents a metallic luster and can present various colors. The glaze with a metallic luster has an elegant and luxurious artistic effect, which is favored by the market and consumers.

[0003] The metal glaze in the prior art usually relies on a large amount of directly added metal oxides (such as copper oxide) and commercial metal colorants. This method excessively relies on pre-synthesized metal colorants, has high cost, and the difference in stability of the colorants at high temperature can cause color fluctuation between batches; and simple physical mixing can cause insufficient reaction of each component in the glaze when molten at high temperature, uneven distribution of metal particles, and problems such as color spots and uneven gloss, and the glaze is easily oxidized and darkened when exposed to air for a long time.

[0004] Therefore, it is necessary to provide a glaze formula and a preparation method of stable, uniform and strong metallic luster. SUMMARY

[0005] The present application is made in view of the above problems, and aims to provide a colorful metal glaze and a preparation method thereof and a ceramic product.

[0006] Specifically, the present application provides a colorful metal glaze, which comprises the following components in parts by weight: base glaze: 70-90 parts; nanocomposite crystal nucleus agent: 0.1-3 parts; metal colorant: 8-11 parts; rare earth color modifier: 0.5-2 parts; The nanocomposite crystal nucleus agent is a core-shell structure nanoparticle.

[0007] Further, the base glaze comprises the following components in parts by weight: potassium feldspar 20-30 parts, quartz 10-15 parts, spodumene 5-10 parts, kaolin 8-12 parts, calcined zinc oxide 4-7 parts, strontium carbonate 3-6 parts, talc 4-6 parts, Suzhou soil 5-8 parts.

[0008] Furthermore, the nanocomposite nucleating agent is a ZrO2@SiO2 core-shell structured nanoparticle, wherein ZrO2 is the core and SiO2 is the outer shell, and the average particle size of the nanocomposite nucleating agent is 20-50 nm.

[0009] Furthermore, the ZrO2@SiO2 core-shell structured nanoparticles were prepared using the sol-gel method. First, monoclinic ZrO2 nanosol was prepared, and then tetraethyl orthosilicate was hydrolyzed on its surface to form an amorphous SiO2 coating layer. Finally, the nanoparticles were dried to obtain a white powder.

[0010] Furthermore, the metal colorant includes copper oxide, ferric oxide, and manganese dioxide; The composition includes 2-4 parts copper oxide, 3-5 parts ferric oxide, and 1-2 parts manganese dioxide.

[0011] Furthermore, the rare earth colorant is a complex of neodymium oxide and praseodymium oxide; The mass ratio of neodymium oxide to praseodymium oxide is 0.2-4:1.

[0012] A second aspect of this invention provides a method for preparing a dazzling metallic glaze, comprising the following steps: (1) The nanocomposite nucleating agent and some of the basic glaze raw materials are pre-dispersed to obtain a premix; (2) Mix the remaining base glaze raw materials, the premix obtained in step (1) and the metal colorant, and perform wet ball milling to obtain the base glaze slurry; (3) Add rare earth colorant to the base glaze slurry obtained in step (2), mix evenly and then age to obtain the final glaze slurry; (4) Apply the final glaze to the ceramic body, dry it, and then fire it in the kiln.

[0013] Furthermore, in step (1), the pre-dispersion is a dry mixing process, and the base glaze raw material used for pre-dispersion is kaolin or Suzhou clay.

[0014] Furthermore, in step (2), the weight ratio of material:ball:water in the wet ball mill is 1:1.2-1.6:0.4-0.6, the ball milling time is 2-4 hours, and the fineness requirement of the glaze slurry after ball milling is ≤0.5 parts sieve residue on a 10,000-hole sieve.

[0015] Furthermore, in step (3), the aging time is 12-48 hours.

[0016] Furthermore, in step (4), the thickness of the wet glaze layer after glazing is controlled at 0.6-0.9 mm.

[0017] Further, in step (4), the firing process includes: Heating to 1200-1300℃ in an oxidizing atmosphere; at this temperature, a weak reducing atmosphere is introduced and the temperature is held for 20-40 minutes; after the holding period, the temperature is cooled to 1000-1050℃ at a cooling rate of not less than 80℃ / minute. Switch to an inert protective atmosphere at 1000-1050℃ and keep warm for 10-20 minutes; Finally, allow it to cool naturally to room temperature.

[0018] Furthermore, the weak reducing atmosphere is a nitrogen mixture with a carbon monoxide volume concentration of 3-5%; the inert protective atmosphere is nitrogen or argon.

[0019] A third aspect of this application provides a ceramic article, the surface of which is coated with the aforementioned iridescent metallic glaze.

[0020] The present invention has the following beneficial effects: In this invention, the potassium feldspar, quartz, and other raw materials in the base glaze form a stable glassy phase structure at high temperatures, enhancing the mechanical strength and thermal stability of the ceramic products. The ZrO2@SiO2 core-shell structure nanoparticles, a nanocomposite nucleating agent, provide nucleation sites through their ZrO2 cores, while the SiO2 shell acts as a protective and regulating layer, allowing metal particles to be evenly distributed within the glaze layer and avoiding problems such as color spots and uneven gloss. The rational combination of copper oxide, ferric oxide, and manganese dioxide in the metallic colorants not only reduces dependence on single metal oxides but also produces rich colors through the synergistic effect of different metal elements. Copper oxide imparts a unique blue or green hue to the glaze, ferric oxide can produce red or brown, and manganese dioxide can adjust the depth and saturation of the color. The rare earth colorant complex of neodymium oxide and praseodymium oxide further optimizes the color performance of the glaze.

[0021] In terms of preparation process, the pre-dispersion step involves dry mixing of the nanocomposite nucleating agent with a portion of the basic glaze raw materials, ensuring uniform dispersion of nanoparticles in the glaze and improving the sufficiency of subsequent reactions. During wet ball milling, strict control of the weight ratio of material, balls, and water, as well as the milling time, guarantees the fineness and uniformity of the glaze slurry, laying the foundation for the smoothness and gloss of the glaze surface. The design of the firing regime is even more crucial. Heating under an oxidizing atmosphere allows for the complete combustion of organic matter in the glaze, creating favorable conditions for subsequent reactions. Introducing a weak reducing atmosphere and maintaining the temperature promotes the reduction of metal oxides into metal particles, forming a metallic luster. Rapid cooling and switching between an inert protective atmosphere effectively prevent the oxidation and agglomeration of metal particles, ensuring the stability and durability of the metallic luster of the glaze surface.

[0022] The ceramic products prepared by this invention have a stable, uniform, and strong metallic luster. This not only solves the problems of strong dependence on color development, insufficient glaze stability, and poor component synergy in existing metallic glazes, but also improves the quality and artistic value of ceramic products, and has broad market application prospects. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this drawing 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 drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a photograph of the metallic glaze prepared in Example 1 of the present invention; Figure 2 This is an effect diagram of the metallic glaze prepared in Example 1 of the present invention.

[0025] The purpose, features, and advantages of this accompanying drawing will be further explained in conjunction with the embodiments and with reference to the accompanying drawing. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following description and illustration are provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0027] Obviously, the following description is merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios without any inventive effort. Furthermore, it is understood that although the effort involved in such development may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0028] An embodiment of the first aspect of this application provides a dazzling metallic glaze, which comprises the following components by weight: base glaze: 70-90 parts; Nanocomposite nucleating agent: 0.1-3 parts; Metallic colorant: 8-11 parts; Rare earth colorant: 0.5-2 parts; The nanocomposite nucleating agent is a core-shell structured nanoparticle.

[0029] This invention relates to a dazzling metallic glaze comprising a base glaze, a nanocomposite nucleating agent, a metallic colorant, and a rare earth toner. The base glaze, as the main component, provides the essential physical properties and chemical stability for the dazzling metallic glaze. The nanocomposite nucleating agent plays a crucial nucleation role during the high-temperature melting process of the base glaze. Its core-shell structure design allows the core ZrO2 to precisely induce the crystallization and growth of metal particles, while the outer shell SiO2 acts as a protective film, preventing excessive agglomeration of metal particles at high temperatures and ensuring uniform distribution of metal particles within the glaze layer.

[0030] In this embodiment, the base glaze comprises the following components by weight: 20-30 parts potassium feldspar, 10-15 parts quartz, 5-10 parts spodumene, 8-12 parts kaolin, 4-7 parts calcined zinc oxide, 3-6 parts strontium carbonate, 4-6 parts talc, and 5-8 parts Suzhou clay.

[0031] The potassium feldspar melts at high temperatures to form a glassy phase, providing the glaze with viscosity and fluidity, which helps in the uniform distribution of other components and enhances the bonding between the glaze and the ceramic body. Quartz has a high melting point and chemical stability, and reacts with other substances at high temperatures to form a robust network structure, improving the hardness and wear resistance of the glaze and making ceramic products more durable. Spodumene promotes the melting of the glaze, reducing energy consumption, and also improves the coefficient of thermal expansion of the glaze, enhancing the thermal stability of ceramic products and preventing cracking due to temperature changes during use. Kaolin has good plasticity and viscosity, which helps in shaping and maintaining the shape during glaze preparation, and it can also adsorb other components, making the glaze more uniform and stable. Calcined zinc oxide reacts with other oxides at high temperatures, acting as a flux and adjusting the gloss of the glaze. It can make the glaze surface smoother and more delicate, enhance the reflective effect of the glaze, and thus improve the metallic luster. Strontium carbonate in glazes improves the chemical stability and corrosion resistance of the glaze layer, and also has a certain influence on the color of the glaze surface. It can interact with metallic colorants to fine-tune the color of the glaze. Talc has lubricating and fluxing properties; it can reduce the viscosity of the glaze, making the glaze slurry easier to apply to the ceramic body, and it helps to form a uniform glaze layer during firing. Suzhou clay can improve the suspension and stability of the glaze, preventing sedimentation and stratification during storage and use, and ensuring the uniformity of the glaze quality.

[0032] The rational proportions of these basic glaze raw materials and the interaction between their components result in complex physical and chemical changes during high-temperature firing, forming a stable glass phase structure. This provides a favorable environment for the action of nanocomposite nucleating agents, metallic colorants, and rare earth toners, collectively creating a metallic glaze with a stable, uniform, and strong metallic luster.

[0033] In this embodiment, the nanocomposite nucleating agent is a ZrO2@SiO2 core-shell structured nanoparticle, wherein ZrO2 is the core and SiO2 is the shell, and the average particle size of the nanocomposite nucleating agent is 20-50 nm.

[0034] The ZrO2@SiO2 core-shell structured nanoparticles were prepared using a sol-gel method. First, a monoclinic ZrO2 nanosol was prepared, and then tetraethyl orthosilicate was hydrolyzed on its surface to form an amorphous SiO2 coating layer. Finally, the nanoparticles were dried to obtain a white powder.

[0035] The preparation method of the ZrO2@SiO2 core-shell structured nanoparticles is as follows: (1) Dissolve 5g of zirconium oxychloride in 200mL of deionized water to prepare solution A. Place solution A in a 70℃ constant temperature water bath, add 25% ammonia water under magnetic stirring, and adjust the pH of the solution to 9-10; continue stirring for 2 hours to generate white Zr(OH)4 precipitate, centrifuge and wash; dry the washed wet gel at 80℃ for 12 hours, and then place it in a muffle furnace and calcine at 500℃ for 2 hours (heating rate 2℃ / min) to obtain monoclinic ZrO2 nanopowder.

[0036] (2) Take 1g of ZrO2 nanopowder prepared in the above steps, disperse it in 160mL of anhydrous ethanol, and sonicate it for 30 minutes to form a uniform suspension B; add 40mL of deionized water and 2mL of concentrated ammonia (as a catalyst) to the suspension B, and mechanically stir at room temperature.

[0037] (3) Mix 2 mL of tetraethyl orthosilicate with 20 mL of anhydrous ethanol to prepare solution C. Using a constant pressure separatory funnel, slowly add solution C to suspension B at a rate of 1 drop / second. After the addition is complete, continue the reaction at room temperature for 12 hours. During this process, tetraethyl orthosilicate hydrolyzes and condenses on the surface of ZrO2 nanoparticles to form an amorphous SiO2 shell. After the reaction is complete, wash the product three times with anhydrous ethanol by centrifugation, and then dry it at 100°C for 6 hours to obtain a white powder. Calcine the dried powder in an air atmosphere at 550°C for 1 hour to obtain the final product, which is ZrO2@SiO2 core-shell structured nanoparticles.

[0038] In this embodiment, the metal colorant includes copper oxide, ferric oxide, and manganese dioxide; the copper oxide is 2-4 parts, the ferric oxide is 3-5 parts, and the manganese dioxide is 1-2 parts.

[0039] The oxidized and reduced states of copper oxide, ferric oxide, and manganese dioxide in metallic colorants change under different firing atmospheres and temperatures. Under a weakly reducing atmosphere, copper oxide may be reduced to cuprous ions with a unique luster, giving the glaze a mysterious blue or green hue. Ferric oxide undergoes complex phase transitions at high temperatures, producing warm tones such as red and brown. Manganese dioxide acts as a color regulator, interacting with other metal ions to adjust the saturation and brightness of colors.

[0040] In this embodiment, the rare earth colorant is a complex of neodymium oxide and praseodymium oxide; the mass ratio of neodymium oxide to praseodymium oxide is 0.2-4:1.

[0041] The rare earth colorants neodymium oxide and praseodymium oxide complex add unique colors to the glaze; praseodymium oxide can also form complexes with other metal ions, further altering the optical properties of the glaze. By precisely controlling the mass ratio of neodymium oxide to praseodymium oxide, the color of the glaze can be finely adjusted to meet the personalized color needs of different consumers.

[0042] A second aspect of the present invention provides a method for preparing a dazzling metallic glaze, comprising the following steps: (1) Pre-disperse 1-3 parts of nanocomposite nucleating agent with an equal weight of base glaze raw material (such as kaolin) to obtain a premix; ensure that the nanoparticles are initially dispersed and isolated; (2) Mix the remaining base glaze raw materials, the premix obtained in step (1) and the metal colorant, and perform wet ball milling to obtain the base glaze slurry; (3) Add 0.5-2 parts of rare earth colorant to the base glaze slurry obtained in step (2), stir at low speed for 30 minutes to mix evenly, and then age to allow the rare earth ions to be fully hydrolyzed and adsorbed to obtain the final glaze slurry; (4) Apply the final glaze to the ceramic body, dry it, and then fire it in the kiln.

[0043] In this embodiment, in step (1), the pre-dispersion is a dry mixing process, and the base glaze raw material used for pre-dispersion is kaolin or Suzhou clay.

[0044] In this embodiment, in step (2), the weight ratio of material:ball:water in the wet ball mill is 1:1.2-1.6:0.4-0.6, preferably 1:1.5:0.5, the ball milling time is 2-4 hours, and the fineness requirement of the glaze slurry after ball milling is ≤0.5 parts sieve residue on a 10,000-hole sieve.

[0045] In this embodiment, the aging time in step (3) is 12-48 hours.

[0046] In this embodiment, in step (4), the thickness of the wet glaze layer after glazing is controlled at 0.6-0.9 mm.

[0047] In this embodiment, step (4) includes the firing process as follows: The temperature is increased to 1200-1300℃ at a rate of 3℃ / min under an oxidizing atmosphere. At this temperature, a weak reducing atmosphere is introduced and the temperature is maintained for 20-40 minutes. The purpose of this step is to fully reduce the metal oxide into metal particles, creating conditions for the formation of metallic luster. During the heating stage in the oxidizing atmosphere, it is ensured that the organic matter in the glaze is completely burned, avoiding residual impurities from affecting the glaze quality. The introduction of a weak reducing atmosphere and the maintenance temperature allow for precise control of the metal particle generation process, ensuring that the metal particles are evenly distributed in the glaze layer.

[0048] After the heat treatment is completed, the temperature is lowered to 1000-1050℃ at a rate of 80-100℃ / minute. This rapid cooling is to freeze the metal atoms and low-valence ions generated during the reduction stage and force them to rapidly precipitate micron-sized metal crystals around a nanocomposite nucleating agent. At 1000-1050℃, an inert protective atmosphere is switched and the temperature is maintained for 10-20 minutes. Nitrogen protection aims to prevent the reduced metal particles from being re-oxidized during subsequent cooling, thereby stabilizing their color and luster. This step is crucial for ensuring the durability of the iridescent effect. Finally, the temperature is allowed to cool naturally to room temperature under a nitrogen atmosphere.

[0049] In this embodiment, the weak reducing atmosphere is a nitrogen mixture with a carbon monoxide volume concentration of 3-5%; the inert protective atmosphere is nitrogen or argon.

[0050] A third aspect of this application provides a ceramic article, the surface of which is coated with the aforementioned iridescent metallic glaze.

[0051] Example The following examples describe the disclosure of this invention in more detail. These examples are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of this disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight. Unless otherwise stated, all reagents used in the examples are available commercially or synthesized using conventional methods and are ready for use without further processing. Unless otherwise stated, all instruments used in the examples are available commercially.

[0052] Example 1 A dazzling metallic glaze comprises: a base glaze (76 parts); a nano-composite nucleating agent (2 parts); a metallic colorant (9 parts); and a rare earth colorant (1.5 parts). Among them, 25 parts of potassium feldspar in the base glaze were purchased from Lingshou County Huizhong Mineral Products Co., Ltd. Twelve samples of quartz were purchased from Leixiang Mineral Products Processing Plant in Lingshou County. Eighteen portions of spodumene were purchased from Shijiazhuang Xu'ang Mineral Products Processing Co., Ltd. Ten parts of kaolin, whose main components are mullite, wollastonite and other aluminosilicate minerals, were purchased from Lingshou County Xuhai Mineral Products Trading Co., Ltd. Five parts of calcined zinc oxide were purchased from Shenyang Senio Chemical Co., Ltd. Five portions of strontium carbonate were purchased from Shijiazhuang Jinghuang Technology Co., Ltd. Five portions of talc were purchased from Suzhou Yiwei Nano Chemical Co., Ltd. Six portions of Suzhou clay, namely Suzhou kaolin, whose main component is aluminum silicate, were purchased from Shanghai Panshi Mining Co., Ltd. The nanocomposite nucleating agent is ZrO2@SiO2 core-shell structured nanoparticles; The metallic colorant contains 3 parts copper oxide, 4 parts ferric oxide, and 2 parts manganese dioxide; The mass ratio of neodymium oxide to praseodymium oxide in rare earth colorants is 3:1.

[0053] The preparation method of the iridescent metallic glaze includes the following steps: (1) The nanocomposite nucleating agent and an equal weight of kaolin are pre-dispersed to obtain a premix; to ensure that the nanoparticles are initially dispersed and isolated; (2) Mix the remaining basic glaze raw materials, the premix obtained in step (1) and the metal colorant, and perform wet ball milling, wherein the weight ratio of material:ball:water is 1:1.5:0.5, the ball milling time is 3 hours, and the fineness requirement of the glaze slurry after ball milling is ≤0.5 parts of residue on a 10,000-mesh sieve, to obtain the basic glaze slurry; (3) Add rare earth colorant to the base glaze slurry obtained in step (2), stir at low speed for 30 minutes to mix evenly, and then age for 24 hours to allow rare earth ions to be fully hydrolyzed and adsorbed to obtain the final glaze slurry. (4) Apply the final glaze slurry to the ceramic body, controlling the thickness of the wet glaze layer to 0.7 mm, and fire it in a kiln after drying; the firing process includes: The temperature was increased to 1250°C at a rate of 3°C / min under an oxidizing atmosphere; at this temperature, a nitrogen mixture with a carbon monoxide volume concentration of 4% was introduced and held for 30 minutes; after the holding period, the temperature was cooled to 1050°C at a rate of 90°C / min; at 1050°C, the temperature was switched to a nitrogen atmosphere and held for 15 minutes; finally, the temperature was allowed to cool naturally to room temperature under a nitrogen atmosphere.

[0054] Example 2 A dazzling metallic glaze is composed of the following components: base glaze: 76 parts; nano-composite nucleating agent: 1 part; metallic colorant: 6 parts; rare earth colorant: 1.5 parts; The base glaze contains 22 parts potassium feldspar, 15 parts quartz, 10 parts spodumene, 8 parts kaolin, 4 parts calcined zinc oxide, 6 parts strontium carbonate, 6 parts talc, and 5 parts Suzhou clay. The nanocomposite nucleating agent is ZrO2@SiO2 core-shell structured nanoparticles; The metallic colorant contains 2 parts copper oxide, 3 parts ferric oxide, and 1 part manganese dioxide. The mass ratio of neodymium oxide to praseodymium oxide in rare earth colorants is 3:1.

[0055] Example 3 A dazzling metallic glaze comprises: a base glaze (77 parts); a nano-composite nucleating agent (3 parts); a metallic colorant (11 parts); and a rare earth colorant (1.5 parts). The base glaze contains 28 parts potassium feldspar, 10 parts quartz, 5 parts spodumene, 12 parts kaolin, 7 parts calcined zinc oxide, 3 parts strontium carbonate, 4 parts talc, and 8 parts Suzhou clay. The nanocomposite nucleating agent is ZrO2@SiO2 core-shell structured nanoparticles; The metallic colorant contains 4 parts copper oxide, 5 parts ferric oxide, and 2 parts manganese dioxide; The mass ratio of neodymium oxide to praseodymium oxide in rare earth colorants is 2:1.

[0056] Example 4 A dazzling metallic glaze is composed of the following components: base glaze: 76 parts; nano-composite nucleating agent: 0.1 parts; metallic colorant: 9 parts; rare earth colorant: 1.5 parts; The base glaze contains 25 parts potassium feldspar, 12 parts quartz, 8 parts spodumene, 10 parts kaolin, 5 parts calcined zinc oxide, 5 parts strontium carbonate, 5 parts talc, and 6 parts Suzhou clay. The nanocomposite nucleating agent is ZrO2@SiO2 core-shell structured nanoparticles; The metallic colorant contains 3 parts copper oxide, 4 parts ferric oxide, and 2 parts manganese dioxide; The mass ratio of neodymium oxide to praseodymium oxide in rare earth colorants is 3:1.

[0057] Example 5 A dazzling metallic glaze is composed of the following components: base glaze: 76 parts; nano-composite nucleating agent: 2 parts; metallic colorant: 9 parts; rare earth colorant: 1.5 parts; The base glaze contains 25 parts potassium feldspar, 12 parts quartz, 8 parts spodumene, 10 parts kaolin, 5 parts calcined zinc oxide, 5 parts strontium carbonate, 5 parts talc, and 6 parts Suzhou clay. The nanocomposite nucleating agent is ZrO2@SiO2 core-shell structured nanoparticles; The metallic colorant contains 3 parts copper oxide, 4 parts ferric oxide, and 2 parts manganese dioxide; The mass ratio of neodymium oxide to praseodymium oxide in rare earth colorants is 0.2:1.

[0058] Comparative Example 1 This comparative example is basically the same as Example 1, except that a weak reducing gas is not introduced during the firing process in step (4).

[0059] Comparative Example 2 This comparative example is basically the same as Example 1, except that after the heat preservation during the firing process in step (4) is completed, it is cooled to 1050°C at a cooling rate of 20°C / minute.

[0060] Comparative Example 3 This comparative example is basically the same as Example 1, except that in step (4), the firing process is directly air-cooled to room temperature at 1050°C.

[0061] Experimental Case The following performance tests were performed on the metallic glazes of Examples 1-5 and Comparative Examples 1-3: Gloss: The gloss level at 60° was tested according to GB4806.10-2016 standard. Chromaticity coordinates: L*a*b* values ​​were determined using a spectrophotometer; Alkali resistance: Observe the changes after soaking in 5% NaOH solution for 24 hours.

[0062] The test results are shown in Table 1.

[0063]

[0064] As shown in Table 1, the iridescent metallic glazes of Examples 1-5 generally outperformed Comparative Examples 1-3 in all performance indicators. Regarding gloss, the values ​​for gloss in the examples were generally higher, indicating that strictly adhering to the weak reducing atmosphere and rapid cooling steps in the firing process effectively promoted the formation and distribution of metal particles, thereby enhancing the gloss of the glaze. In contrast, Comparative Example 1 did not introduce a weak reducing gas, Comparative Example 2 had an excessively slow cooling rate, and Comparative Example 3 was directly air-cooled. These operations all affected the formation and distribution of metal particles, resulting in a significant decrease in gloss.

[0065] In terms of chromaticity, the embodiment achieved fine adjustment of the glaze color by precisely controlling the composition and ratio of metallic colorants and rare earth toners, as well as a reasonable firing process. In the comparative embodiment, due to changes in the firing process, the reduction of metal oxides and the formation of metal particles were interfered with, ultimately resulting in a glaze color that deviated from expectations, and unsatisfactory color saturation and brightness.

[0066] In the alkali resistance test, the glaze of the example showed little change after being immersed in 5% NaOH solution for 24 hours, indicating its good chemical stability. This is because during normal firing, the various components in the glaze react fully to form stable chemical bonds. In contrast, the comparative example, due to changes in the firing process, experienced alterations in the chemical composition and structure of its glaze, resulting in reduced alkali resistance.

[0067] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A dazzling metallic glaze, characterized in that, The iridescent metallic glaze comprises the following components by weight: Base glaze: 70-90 parts; Nanocomposite nucleating agent: 0.1-3 parts; Metallic colorant: 8-11 parts; Rare earth colorant: 0.5-2 parts; The nanocomposite nucleating agent is a core-shell structured nanoparticle.

2. The iridescent metallic glaze according to claim 1, characterized in that, The base glaze comprises the following components by weight: 20-30 parts potassium feldspar, 10-15 parts quartz, 5-10 parts spodumene, 8-12 parts kaolin, 4-7 parts calcined zinc oxide, 3-6 parts strontium carbonate, 4-6 parts talc, and 5-8 parts Suzhou clay.

3. The iridescent metallic glaze according to claim 1, characterized in that, The nanocomposite nucleating agent is a ZrO2@SiO2 core-shell structured nanoparticle, in which ZrO2 is the core and SiO2 is the outer shell, and the average particle size of the nanocomposite nucleating agent is 20-50 nm.

4. The iridescent metallic glaze according to claim 1, characterized in that, The metallic colorant includes copper oxide, ferric oxide, and manganese dioxide; The composition includes 2-4 parts copper oxide, 3-5 parts ferric oxide, and 1-2 parts manganese dioxide.

5. The iridescent metallic glaze according to claim 1, characterized in that, The rare earth colorant is a complex of neodymium oxide and praseodymium oxide; The mass ratio of neodymium oxide to praseodymium oxide is 0.2-4:

1.

6. A method for preparing a dazzling metallic glaze, characterized in that, The method for preparing the iridescent metallic glaze according to any one of claims 1-5 comprises the following steps: (1) The nanocomposite nucleating agent and some of the basic glaze raw materials are pre-dispersed to obtain a premix; (2) Mix the remaining base glaze raw materials, the premix obtained in step (1) and the metal colorant, and perform wet ball milling to obtain the base glaze slurry; (3) Add rare earth colorant to the base glaze slurry obtained in step (2), mix evenly and then age to obtain the final glaze slurry; (4) Apply the final glaze to the ceramic body, dry it, and then fire it in the kiln.

7. The method for preparing iridescent metallic glaze according to claim 6, characterized in that, In step (1), the pre-dispersion is a dry mixing process, and the base glaze raw material used for pre-dispersion is kaolin or Suzhou clay.

8. The method for preparing iridescent metallic glaze according to claim 6, characterized in that, In step (2), the weight ratio of material:ball:water in the wet ball mill is 1:1.2-1.6:0.4-0.6, the ball milling time is 2-4 hours, and the fineness requirement of the glaze slurry after ball milling is ≤0.5 parts residue on a 10,000-mesh sieve.

9. The method for preparing iridescent metallic glaze according to claim 6, characterized in that, In step (4), the firing process includes: Heating to 1200-1300℃ in an oxidizing atmosphere; at this temperature, a weak reducing atmosphere is introduced and the temperature is held for 20-40 minutes; after the holding period, the temperature is cooled to 1000-1050℃ at a cooling rate of not less than 80℃ / minute. Switch to an inert protective atmosphere at 1000-1050℃ and keep warm for 10-20 minutes; Finally, allow it to cool naturally to room temperature.

10. A ceramic product, characterized in that, The ceramic product is coated with a dazzling metallic glaze as described in any one of claims 1-5.

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