A metallic luster glaze frit, its preparation method and ceramic product

Abstract

The present invention discloses a metallic luster glaze frit, its preparation method, and a ceramic product. The metallic luster glaze frit provided by the present invention utilizes the principle of phase separation and crystallization to make the fired glaze surface present a metallic luster. The glaze frit is rich in bone meal, which has strong phase separation ability and can promote the nucleation and crystallization components of iron oxide or iron phosphate; copper oxide, as a colorant and crystallization agent, under the action of a large amount of zinc oxide in the glaze frit components, phase-separates to precipitate CuFe2O4 crystals, making the glaze surface present a metallic luster. At the same time, no harmful metals such as lead frit are added to the glaze frit, which is green and environmentally friendly. Moreover, the components of the metallic luster glaze frit are simple, the cost is low, and the glazing process is simple, having extremely high practical application value. Finally, the novel green and environmentally friendly metallic luster glaze frit provided by the present invention can withstand high-temperature firing, the fired glaze surface has good metallic luster, and the glossiness is greater than 95, providing a broader space and more extensive choices for the decoration of ceramics.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramics, and particularly to a metallic luster glaze, a preparation method thereof, and a ceramic product. Background Art

[0002] Metallic luster glaze is a kind of ceramic art glaze with a metallic appearance and artistic effect. When applied to daily-use porcelain or art porcelain, its glaze surface emits a metallic-like luster, which is highly favored by consumers in the ceramic industry. Metal elements are added to the glaze formula of metallic luster glaze, which can not only produce a metallic-like appearance effect, but also enhance the chemical stability of the ceramic glaze surface and its tolerance to acids and alkalis. Currently, there are usually three methods for preparing metallic luster glaze: the first is the thermal spraying method, in which precious metal solutions (such as lead, gold, silver, and platinum, etc.) are sprayed onto the ceramic finished product, and then refired at a low temperature to make the ceramic surface present a metallic luster. However, this method has a high technical cost, resulting in limitations in both raw materials and the production process; the second is the reduction atmosphere sintering method, using a ceramic kiln with a reduction atmosphere, and using metal ions Cu 2+ and Ag + etc. to perform ion exchange with alkaline substances Na + and K + etc., and the metal ions diffuse to the glaze surface. However, this method does not form a vitreous layer, but only a hard adhesion of metal oxides to the ceramic body, and the specific implementation is more difficult; the third is the oxidation atmosphere sintering method, adding certain metal oxides to the basic glaze, and after firing, the glaze surface presents a metallic luster and tone. This process is simple and convenient to operate and is the most widely used in actual applications.

[0003] In the current oxidation atmosphere sintering process, most metallic luster glazes are formulated with lead borate base glazes because lead-containing fritted glazes have advantages such as good high-temperature fluidity, high gloss and smoothness, a wide firing range, and good body-glaze adaptability. However, lead is a toxic heavy metal, which not only pollutes the environment, but also affects the physical health of producers and users, and its scope of popularization and application is very limited. Moreover, the color change of lead-containing monochromatic metallic glazes is not obvious, and the metallic luster is not high. At the same time, this process generally adopts the method of adding excessive rare metal oxides, and there are many components, resulting in high costs. Not only that, the existing glaze products with metallic luster cannot withstand high-temperature firing processes above 1100 °C, which brings certain limitations to the actual use process of the glaze.

[0004] Therefore, it is of great significance to develop a metallic luster glaze that is green and environmentally friendly, has good metallic luster, low cost, and is high-temperature resistant. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a metallic luster glaze frit, a preparation method thereof, and a ceramic product, aiming to solve the problems of harmful metals, high cost, low gloss, and poor high-temperature firing resistance in current metallic luster glazes.

[0006] In a first aspect of the present invention, there is provided a metallic luster glaze frit. By mass, the raw materials of the metallic luster glaze frit include 23 - 27 parts of quartz, 4 - 7 parts of kaolin, 17 - 21 parts of potassium feldspar, 6 - 9 parts of sodium feldspar, 8 - 11 parts of calcite, 13 - 16 parts of zinc oxide, 3 - 5 parts of bone meal, 5 - 8 parts of fritted glaze, 1.5 - 3 parts of strontium carbonate, 1.5 - 2 parts of copper oxide, and 5 - 8 parts of iron oxide.

[0007] The metallic luster glaze frit according to the embodiments of the present invention has at least the following beneficial effects: The present invention provides a metallic luster glaze frit. Using the principle of phase separation and crystallization, the metal oxides added to the frit form regularly arranged crystals on the glaze surface during sintering, which can perform specular reflection or scattering on light, making the fired glaze surface exhibit a metallic luster. The frit provided by the present invention is rich in bone meal, which has strong phase separation ability and can promote the nucleation and crystallization components of iron oxide or iron phosphate; zinc oxide can reduce the high-temperature viscosity of the melt and promote crystallization; copper oxide, as a colorant and crystallization agent, under the action of a large amount of zinc oxide in the frit components, phase-separates to precipitate CuFe2O4 crystals, making the glaze surface exhibit a metallic luster; silicon dioxide and alumina can increase the firing temperature of the frit and increase the high-temperature viscosity, thereby affecting the precipitation and growth of crystals; the component strontium carbonate can reduce the glaze temperature, improve the smoothness and gloss of the glaze surface, and form a uniform and smooth coating at high temperature. At the same time, harmful metals such as lead fritted glaze are not added to the frit, avoiding environmental pollution and damage to production workers during the production process of the frit, as well as the risk of dissolving lead elements due to acid erosion during use and endangering human health, which is green and environmentally friendly. Moreover, the composition of the metallic luster glaze frit is simple, the cost is low, and the glazing process is simple, having extremely high practical application value. Finally, the novel green and environmentally friendly metallic luster glaze frit provided by the present invention can be fired at high temperatures (it can be fired under the condition that the firing temperature is greater than 1100 °C), enabling the production of sanitary ceramics, expanding the actual application range of the frit; and the fired glaze surface has good metallic luster, with a gloss greater than 95, providing a broader space and more extensive choices for the decoration of ceramics.

[0008] In some embodiments of the present invention, the molar ratio of silicon dioxide (SiO2) to alumina (Al2O3) in the metallic luster glaze frit is 10.5 - 12.5.

[0009] The present invention regulates the metallic color intensity of the glaze surface by the silica-alumina ratio, and the range of the silica-alumina ratio is 10.5 to 12.5. Increasing the silica-alumina ratio increases the gloss of the glaze surface but weakens the metallic color; decreasing the silica-alumina ratio decreases the gloss of the glaze surface but increases the metallic color. Within the range of 10.5 to 12.5, the glaze surface can exhibit a strong metallic feeling and excellent glossiness.

[0010] In some embodiments of the present invention, the chemical composition of the frit includes magnesium oxide (MgO), calcium oxide (CaO), aluminum oxide (Al2O3), silicon dioxide (SiO2), potassium oxide (K2O), sodium oxide (Na2O), and zirconium dioxide (ZrO2).

[0011] In some preferred embodiments of the present invention, by mass percentage, the chemical composition of the frit includes 2.5% to 4.6% of magnesium oxide, 12.6% to 15.3% of calcium oxide, 10.3% to 14.6% of aluminum oxide, 63.7% to 66.8% of silicon dioxide, 1.8% to 3.2% of potassium oxide, 0.8% to 3.5% of sodium oxide, and 1.2% to 2.8% of zirconium dioxide.

[0012] In a specific embodiment of the present invention, the chemical composition of the frit includes 3.4% of MgO, 14.39% of CaO, 11.48% of Al2O3, 64.46% of SiO2, 2.74% of K2O, 1.38% of Na2O, and 1.61% of ZrO2.

[0013] In some embodiments of the present invention, by mass percentage, the chemical composition of the metallic luster glaze frit includes 6.09% to 8.73% of aluminum oxide (Al2O3), 43.70% to 55.93% of silicon dioxide (SiO2), 2.02% to 2.58% of potassium oxide (K2O), 1.29% to 1.79% of sodium oxide (Na2O), 0.64% to 0.99% of magnesium oxide (MgO), 7.03% to 10.35% of calcium oxide (CaO), 0.08% to 0.13% of zirconium dioxide (ZrO2), 12.93% to 15.92% of zinc oxide (ZnO), 0.87% to 1.45% of phosphorus pentoxide (P2O5), 5.03% to 8.03% of iron(III) oxide (Fe2O3), 1.45% to 1.90% of copper(II) oxide (CuO), and 1.48% to 2.96% of strontium oxide (SrO).

[0014] In the second aspect of the present invention, a method for preparing a glaze slurry of the above-mentioned metallic luster glaze frit is provided, including the steps of: mixing each raw material component according to a mass parts ratio, then adding water and an adhesive, and after mixing evenly, putting it into a ball mill and ball milling until the particles with a particle size below 10 μm account for 65% to 68% of the total weight of the glaze slurry to obtain the glaze slurry.

[0015] The preparation method of the glaze slurry of the metallic luster glaze according to the embodiment of the present invention has at least the following beneficial effects: The preparation method of the present invention has a simple process, is closer to production, and can be directly industrialized. Moreover, by controlling the particle size of the glaze slurry, the glaze particles with a particle size lower than 10 μm account for 65% - 68% of the total weight of the glaze slurry. Within this range, the melting effect of the glaze surface is good, and it is not easy to crack the glaze after firing.

[0016] In some embodiments of the present invention, the adhesive includes sodium carboxymethylcellulose. Sodium carboxymethylcellulose, as an adhesive, has the functions of moisture absorption and water retention.

[0017] Preferably, the mass fraction of the adhesive is 0.2 - 0.4 parts.

[0018] In some embodiments of the present invention, the mass ratio of the total mass of each raw material of the metallic luster glaze to the mass of water is (1 - 3):1, preferably 2:1.

[0019] In a specific embodiment of the present invention, each raw material of the metallic luster glaze and water are mixed at a mass ratio of 2:1, 0.2 - 0.4 parts of sodium carboxymethylcellulose are added, and after mixing evenly, they are put into a ball mill for sufficient grinding. The sufficient grinding means that the proportion of the number of particles with a particle size below 10 μm in the mixture is 68%.

[0020] In the third aspect of the present invention, a preparation method of a ceramic product is proposed, including the steps:

[0021] S1. Provide a green body;

[0022] S2. Apply the glaze slurry onto the green body;

[0023] S3. Put the green body applied with the glaze slurry into a sanitary ceramic kiln for firing to obtain the ceramic product;

[0024] Wherein, the glaze slurry is obtained by the above-mentioned preparation method.

[0025] The preparation method of the ceramic product according to the embodiment of the present invention has at least the following beneficial effects: The preparation method of the ceramic product provided by the present invention uses a green and environmentally friendly metallic luster glaze to prepare ceramic products, which can adapt to the production of sanitary ceramics, can be fired under the condition that the firing temperature is greater than 1100 °C, broadens the actual application range of the glaze, provides a broader space for the decoration of sanitary ceramics, as well as more beautiful glaze colors, is closer to production, and can be directly industrialized.

[0026] In some embodiments of the present invention, the thickness of the applied glaze slurry is 0.3 - 0.5 mm.

[0027] In the solution of the present invention, the thickness of the glaze application has a great influence on the color of the glaze surface. The thickness of the glaze application directly affects the quality of the color of the glaze surface. If the glaze is too thin, the metallic luster is not obvious, the metallic luster effect is not ideal, and very few spinel crystals precipitate; if the glaze layer is too thick, the glaze surface will emit gray mottles and the metallic feeling will be weakened. The range of the thickness of the glaze application in the present invention is 0.3 mm to 0.5 mm. Within the above range, the metallic feeling of the glaze surface is strong and the metallic luster is obvious.

[0028] In some embodiments of the present invention, the green body is a product green body made of the raw materials of existing ordinary sanitary ceramic slurries.

[0029] In some embodiments of the present invention, in step S2, the glaze slurry is applied to the green body by using a spray gun.

[0030] In some embodiments of the present invention, in step S3, the firing temperature for firing in the kiln is 1180 - 1250 °C, preferably about 1200 °C.

[0031] In some embodiments of the present invention, in step S3, the firing time for firing in the kiln is 16 - 21 h, preferably 18 h.

[0032] In some embodiments of the present invention, before step S3, there is also a step: putting the green body applied with the glaze slurry into a drying kiln at a temperature of 90 - 110 °C and drying for 5 - 6 h.

[0033] Preferably, put the green body applied with the glaze slurry into a drying kiln at a temperature of 100 °C and dry for 5.5 h.

[0034] In the fourth aspect of the present invention, a ceramic product is proposed, which is obtained by using the above preparation method.

[0035] In some embodiments of the present invention, the glossiness of the glaze surface of the ceramic product is greater than 95.

[0036] The ceramic product according to the embodiment of the present invention has at least the following beneficial effects: The ceramic product provided by the present invention uses the above new type of green and environmentally friendly metallic luster glaze material, can be fired at high temperature, can realize the production of sanitary ceramics, broadens the actual application range of the glaze material; and the fired glaze surface has good metallic glossiness, and the glossiness is greater than 95, providing a broader space and more extensive choices for the decoration of ceramics. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The following further describes the present invention in conjunction with the drawings and embodiments, where:

[0038] Figure 1 is a schematic diagram of the ceramic product of Embodiment 1 of the present invention;

[0039] Figure 2Apparent morphology diagram of the ceramic product in Embodiment 1 of the present invention magnified by 2.9 times;

[0040] Figure 3 Microscopic morphology diagram of the ceramic product in Embodiment 1 of the present invention magnified 1000 times by scanning electron microscopy;

[0041] Figure 4 Microscopic morphology diagram of the ceramic product in Embodiment 1 of the present invention magnified 10,000 times by scanning electron microscopy;

[0042] Figure 5 Microscopic morphology diagram of the ceramic product in Embodiment 1 of the present invention magnified 30,000 times by scanning electron microscopy. Detailed implementation manners

[0043] The concept of the present invention and the technical effects generated will be clearly and completely described below in conjunction with the embodiments to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0044] In the description of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] In the description of the present invention, unless otherwise specified, the numerical range "a~b" represents the abbreviated representation of any real number combination between a and b, where a and b are both real numbers. Unless otherwise specified, each reaction or operation step can be carried out in sequence or not in sequence. Preferably, the reaction method in the present invention is carried out in sequence.

[0046] In the following embodiments, those without specific technologies or conditions indicated are carried out according to the technologies or conditions described in the literature in this field or according to the product specifications. All reagents or instruments without indicating the manufacturer can be obtained as conventional products through commercial purchase.

[0047] Embodiment 1

[0048] In this embodiment, the formula of the metallic luster glaze is as follows:

[0049] Quartz (26 parts), kaolin (5 parts), potassium feldspar (18 parts), sodium feldspar (7 parts), calcite (10 parts), zinc oxide (15 parts), cattle bone meal (4 parts), frit (5 parts), strontium carbonate (2.5 parts), copper oxide (2 parts), and iron oxide (6 parts).

[0050] The composition of the frit is MgO 3.4%, CaO 14.39%, Al2O3 11.48%, SiO2 64.46%, K2O2.74%, Na2O 1.38%, and ZrO2 1.61%.

[0051] (1) mixing the raw materials of the metallic glaze with water in a mass ratio of 2:1, adding 0.3 parts of sodium carboxymethyl cellulose, mixing evenly, and then putting into a ball mill and grinding until the number of particles with a particle size of less than 10 μm accounts for 68% of the particles, to obtain a glaze slurry;

[0052] (2) applying the glaze slurry onto the body using a spray gun, with a glaze thickness of 0.4 mm;

[0053] (3) The green body with the glaze slurry applied is then placed in a drying kiln at 100°C for 5.5 hours;

[0054] (4) The dried green body is placed in a kiln for firing at a temperature of 1200°C for 18 hours to obtain a ceramic product.

[0055] Figure 1 The figure is a schematic diagram of the ceramic product obtained in Example 1 of the present invention. It can be seen that the glaze surface is uniform, the metallic feel is strong, and the metallic gloss is good.

[0056] Figure 2 This is a 2.9-fold magnified surface morphology image of the ceramic product obtained in Example 1 of the present invention. It can be seen that the color is uniform and there are no obvious defects.

[0057] Figures 3 - 5 The scanning electron microscope microscopic morphology pictures of the ceramic product obtained in Example 1 of the present invention at 1000 times, 1000 times and 3000 times magnification respectively show the precipitation, nucleation and crystallization of crystals. CuFe2O4 crystals are phase-separated on the glaze surface of the ceramic product, giving the glaze surface a metallic luster.

[0058] Embodiment 2-9

[0059] The difference from Example 1 is that the glaze formula and the composition of the frit are different. Other conditions are the same as those of Example 1.

[0060] The formula of the metallic glaze in Examples 2-9 is shown in Table 1.

[0061] The composition of the frit in Example 2-3 is the same as that in Example 1.

[0062] The frit compositions of Examples 4-6 are: MgO 4.1%, CaO 13.7%, Al2O3 12.36%, SiO2 64.79%, K2O 2.1%, Na2O 1.1%, ZrO2 1.45%.

[0063] The frit compositions of Examples 7-9 are: MgO 2.6%, CaO 13.52%, Al2O3 10.92%, SiO2 65.2%, K2O 2.5%, Na2O 2.8%, ZrO2 2.2%.

[0064] The ceramic products prepared in Examples 1-9 were subjected to appearance inspection and glossiness inspection, and the results are shown in Table 1. Among them, the glossiness inspection method is: using a 3nh glossiness meter NHG60 from 3nh to measure the glossiness.

[0065] Table 1 (all shown in parts by mass)

[0066]

[0067]

[0068] From the above results, it can be seen that for the ceramic products prepared in Examples 1-9, the fired glaze surface has a good appearance, uniform color, strong metallic color, smooth glaze surface, and good metallic glossiness, and the glossiness is greater than 95. This shows that the technical solutions provided in Examples 1-9 are feasible. This metallic luster glaze uses the principle of phase separation and crystallization to make the fired glaze surface present a metallic-like luster. The glaze is rich in bone meal, which has strong phase separation ability and can promote the nucleation and crystallization components of iron oxide or iron phosphate; copper oxide, as a colorant and crystallization agent, under the action of a large amount of zinc oxide in the glaze components, phase-separates to precipitate CuFe2O4 crystals, making the glaze surface present a metallic-like luster. At the same time, no harmful metals such as lead frit are added to the glaze, which is green and environmentally friendly.

[0069] Examples 10-15

[0070] The difference from Example 1 is: different glaze formulations. Other conditions are the same as those in Example 1.

[0071] The formulations of the metallic luster glaze in Examples 10-15 are shown in Table 2. The ceramic products prepared in Examples 10-15 were subjected to appearance inspection and glossiness inspection, and the results are shown in Table 2. Among them, the glossiness inspection method is the same as above.

[0072] Table 2 (all shown in parts by mass)

[0073]

[0074]

[0075] As can be seen from the above results, the silica-alumina ratio in the glaze also has a certain influence on the gloss and metallic color of the ceramic product. Increasing the silica-alumina ratio increases the gloss of the glaze surface but weakens the metallic color; decreasing the silica-alumina ratio decreases the gloss of the glaze surface but increases the metallic color. In the range of 10.5 - 12.5, the glaze surface can simultaneously exhibit a strong metallic feeling and excellent gloss.

[0076] Example 16

[0077] The difference from Example 1 is that the glazing thickness is 0.3 mm. Other conditions are the same as those in Example 1.

[0078] Example 17

[0079] The difference from Example 1 is that the glazing thickness is 0.5 mm. Other conditions are the same as those in Example 1.

[0080] Comparative Examples 1 - 7

[0081] The difference from Example 1 is that the glaze formulation is different. Other conditions are the same as those in Example 1.

[0082] The formulations of the metallic luster glaze in Comparative Examples 1 - 7 are shown in Table 3.

[0083] Appearance inspection and gloss measurement were carried out on the ceramic products prepared in Comparative Examples 1 - 7, and the results are shown in Table 3. Among them, the gloss measurement method is: using the 3nh glossmeter NHG60 of 3nh to measure the gloss.

[0084] Table 3 (all shown in parts by mass)

[0085]

[0086]

[0087] As can be seen from the results of Examples 1 - 9 and Comparative Examples 1 - 7, the ratios of the raw materials have different effects on the gloss, metallic color, and the final color presented by the ceramic product, either affecting its gloss, or its metallic color, or having an impact on the glaze color. Only the raw materials and ratios within the technical solution scope of the present invention can finally form an excellent yellow metallic luster, with strong metallic color and good gloss.

[0088] Comparative Examples 8 - 13

[0089] The difference from Example 1 is that the number of parts of zinc oxide and bone meal in the glaze is different. Other conditions are the same as those in Example 1.

[0090] The formulations of the metallic luster glaze in Comparative Examples 8 - 13 are shown in Table 4.

[0091] The ceramic products prepared in Comparative Examples 8-13 were subjected to appearance inspection and glossiness inspection, and the results are shown in Table 4. Among them, the glossiness inspection method was as follows: The glossiness was measured using a 3nh glossmeter NHG60 by 3nh.

[0092] Table 4 (All shown in parts by mass)

[0093]

[0094] It can be seen from Example 1 and Comparative Examples 8-13 that in the glaze provided by the present invention, bone meal and zinc oxide have a great influence on the glossiness and metallic color of the glaze surface. This is because bone meal has a strong phase separation ability and can promote the nucleation and crystallization components of iron oxide or iron phosphate; zinc oxide can reduce the high-temperature viscosity of the melt and promote crystallization. In the formulation of Comparative Example 8, the contents of bone meal and zinc oxide are relatively small, the metallic color presented on the glaze surface is weak, and the glaze surface is relatively yellow, and scattered grayish-white crystals precipitate on the glaze surface; in the formulation of Comparative Example 9, there is bone meal but no zinc oxide, the glaze surface is black, without metallic color, and there are many small pores, mainly because the fluidity of the glaze is low and it cannot play a role in phase separation; in the formulation of Comparative Example 10, the amount of bone meal increases and there is no zinc oxide, the glaze surface is black, without metallic luster, and there are many large pores, also because the fluidity of the glaze is low, and although bone meal is added, it still cannot play a role in phase separation; in the formulation of Comparative Example 11, there is zinc oxide but no bone meal, the glaze surface is silver-gray, with a little metallic color, and grayish-white spots precipitate, mainly because there is no bone meal, although the fluidity of the glaze is good, but there is no phase separation effect; in the formulation of Comparative Example 12, the content of zinc oxide is increased and there is no bone meal, the glaze surface is light silver-gray, with a little metallic color, and red crystals precipitate, mainly because there is no bone meal, no phase separation effect, and the content of zinc oxide is relatively high, which is easy to promote crystallization on the glaze surface; in the formulation of Comparative Example 13, there is no zinc oxide and no bone meal, the glaze surface is black, without metallic color, and there are many large pores.

[0095] Comparative Example 14

[0096] The difference from Example 1 was that the glazing thickness was 0.1 mm. Other conditions were the same as those in Example 1.

[0097] Comparative Example 15

[0098] The difference from Example 1 was that the glazing thickness was 0.7 mm. Other conditions were the same as those in Example 1.

[0099] Comparative Example 16

[0100] The difference from Example 1 was that the glazing thickness was 0.9 mm. Other conditions were the same as those in Example 1.

[0101] The ceramic products prepared in Examples 16 - 17 and Comparative Examples 14 - 15 were subjected to appearance inspection and glossiness inspection, and the results are shown in Table 5. Among them, the glossiness inspection method was as follows: The glossiness was measured using a 3nh glossmeter NHG60 of 3nh.

[0102] Table 5

[0103]

[0104] From the above results, it can be seen that the thickness of the glaze application has a very great influence on the color of the glaze surface. The thickness of the glaze application directly affects the quality of the color of the glaze surface. If the glaze is too thin, the metallic luster is not obvious, the metallic luster effect is not ideal, and very few spinel crystals precipitate; if the glaze layer is too thick, gray mottles will appear on the glaze surface and the metallic feeling will be weakened. The range of the glaze application thickness in the present invention is 0.3 mm to 0.5 mm. Within the above range, the metallic feeling of the glaze surface is strong and the metallic luster is obvious.

[0105] The above - described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A metallic luster glaze frit, characterized in that, By mass parts, the raw materials of the metallic luster glaze include 23 - 27 parts of quartz, 4 - 7 parts of kaolin, 17 - 21 parts of potassium feldspar, 6 - 9 parts of albite, 8 - 11 parts of calcite, 13 - 16 parts of zinc oxide, 3 - 5 parts of bone meal, 5 - 8 parts of frit, 1.5 - 3 parts of strontium carbonate, 1.5 - 2 parts of copper oxide, and 5 - 8 parts of iron oxide; among them, the copper oxide and iron oxide contained in the glaze components phase-separate and precipitate CuFe₂O₄ crystals during the firing process; By mass percentage, the chemical composition of the frit includes 10.3% - 14.6% of alumina and 63.7% - 66.8% of silica; The molar ratio of silica to alumina in the metallic luster glaze is 10.5 - 12.

5.

2. The metallic luster glaze according to claim 1, wherein By mass percentage, the chemical composition of the frit further includes 2.5% - 4.6% of magnesia, 12.6% - 15.3% of calcium oxide, 1.8% - 3.2% of potassium oxide, 0.8% - 3.5% of sodium oxide, and 1.2% - 2.8% of zirconia.

3. The metallic luster glaze according to claim 1, characterized in that, By mass percentage, the chemical composition of the metallic luster glaze includes 6.09% - 8.73% of alumina, 43.70% - 55.93% of silica, 2.02% - 2.58% of potassium oxide, 1.29% - 1.79% of sodium oxide, 0.64% - 0.99% of magnesia, 7.03% - 10.35% of calcium oxide, 0.08% - 0.13% of zirconia, 12.93% - 15.92% of zinc oxide, 0.87% - 1.45% of phosphorus pentoxide, 5.03% - 8.03% of iron oxide, 1.45% - 1.90% of copper oxide, and 1.48% - 2.96% of strontium oxide.

4. A method for preparing a glaze slurry of a metallic luster glaze frit as described in any one of claims 1-3, characterized in that, It includes the steps: according to the mass parts ratio, mix each raw material component, then add water and an adhesive, mix evenly and put it into a ball mill to ball mill until the particles with a particle size below 10μm account for 65% - 68% of the total weight of the glaze slurry to obtain the glaze slurry.

5. The preparation method of the glaze slurry according to claim 4, characterized in that, The adhesive includes sodium carboxymethyl cellulose, and the mass parts of the adhesive are 0.2 - 0.4 parts.

6. A method for preparing a ceramic product, characterized in that, It includes the following steps: Provide a green body; Apply the glaze slurry on the green body; Put the green body with the applied glaze slurry into a sanitary ceramic kiln for firing to obtain the ceramic product; Among them, the glaze slurry is obtained by the preparation method described in any one of claims 4 - 5.

7. The method for preparing a ceramic product according to claim 6, characterized in that, The thickness of the applied glaze slurry is 0.3 - 0.5mm.

8. The method for preparing the ceramic product according to claim 6, wherein, The firing temperature for firing in the kiln is 1180 - 1250°C, and the firing time is 16 - 21h.

9. The method for preparing the ceramic product according to claim 8, characterized in that, Before putting the green body with the applied glaze slurry into a sanitary ceramic kiln for firing, it further includes the step: put the green body with the applied glaze slurry into a drying kiln at a temperature of 90 - 110°C and dry for 5 - 6h.

10. A ceramic product, characterized in that, It is obtained by using the preparation method of the ceramic product described in any one of claims 6 - 9.

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