A Langhong Flower Glaze Fusion Glaze and its Preparation Method

Abstract

This invention discloses a Langhong-flower glaze fusion glaze and its preparation method, belonging to the field of copper-red glaze firing technology. The Langhong-flower glaze fusion glaze of this invention includes a Langhong base glaze and a Langhua fusion glaze. The raw materials for the Langhong base glaze include Yaoli glaze fruit, quartz, kaolin, magnesium oxide, zinc oxide, copper oxide, and talc. The raw materials for the Langhua fusion glaze include nepheline syenite, copper oxide, copper carbonate, malachite, copper, sericite, zinc oxide, dolomite, rutile, zirconium silicate, boron trioxide, strontium oxide, bentonite, flint, and bovine bone. This invention overcomes the shortcomings of existing processes, such as complex firing regimes, high energy consumption, and reliance on experience, enabling repeatable and stable firing, and is suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of copper red glaze firing technology, specifically relating to a Langhong flower glaze fusion glaze and its preparation method. Background Technology

[0002] Langhong glaze is an outstanding representative of traditional high-temperature copper-red glaze in my country, first fired during the Kangxi period of the Qing Dynasty. Its vibrant and striking color, resembling freshly congealed ox blood, gives it the name "ox-blood red," and it possesses the typical characteristics of being as clear as a mirror, as smooth as jade, and as red as blood. Langhong glaze represents the highest achievement in high-temperature red glaze firing technology during the Qing Dynasty, possessing unique artistic charm and cultural connotations.

[0003] Langhong glaze uses copper oxide as the main colorant and is fired in a high-temperature reducing flame above 1300℃. The firing process requires extremely strict control over parameters such as kiln temperature, atmosphere (especially carbon monoxide concentration), and cooling rate. The reduced state of copper ions must be precisely formed and maintained within a specific temperature range; even slight deviations will lead to color failure. Currently, although modern technology has made many improvements to the Langhong glaze formula and firing process, it still mainly relies on experienced craftsmen, has a complex firing system, and is energy-intensive. It is difficult to reproduce the rich color and flowing texture of Langhong glaze and achieve high stability and high yield in industrial production. Summary of the Invention

[0004] In response to the content mentioned in the background art, the purpose of this invention is to provide a Langhong flower glaze fusion glaze and its preparation method. By optimizing the selection of different raw materials, this invention combines Langhong base glaze and Langhua fusion glaze, so that the fired porcelain has a deep color like Langhong first congealed ox blood, and can also form filamentous or mottled textures; from a distance, the overall appearance is full red, and when viewed up close, the scattered or interwoven textures in the red glaze can be seen.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution: This invention provides a method for preparing a Langhong flower glaze fusion glaze, comprising the following steps: S1. Weigh out each raw material according to the composition of Langhong base glaze and Langhua fusion glaze, crush and mix them evenly, add water and wet grind to obtain Langhong base glaze slurry and Langhua fusion glaze slurry for later use. S2. First, apply Langhong base glaze slurry to the surface of ceramic clay body and dry it. Then, apply Langhua fusion glaze slurry to the base glaze a second time and dry it to obtain ceramic glaze body. S3. Place the ceramic glaze blank into a sagger and transfer it into an electric-fired kiln. Fire it at a high temperature of 1305-1340℃. After cooling, the Langhonghua glaze fused glaze ceramic is obtained. The specific operation of the high-temperature firing is as follows: First, under an oxidizing atmosphere, the temperature is increased from room temperature to 1020-1060℃ at a rate of 1-3℃ / min and held for 25-35 min; then, the temperature is changed to a strong reducing atmosphere and increased to 1180-1210℃ at a rate of 0.8-1.2℃ / min and held for 10-20 min; finally, the temperature is changed to a weak reducing atmosphere and increased to 1305-1340℃ at a rate of 0.5-0.6℃ / min and held for 30-45 min; the resulting Langhonghua glaze fused glaze ceramic has the following glaze color: L*=12.0~15.8, a*=70.5~78.2, b*=24.0~30.6; The Langhong flower glaze fusion glaze comprises a Langhong base glaze and a Langhua fusion glaze, which are composed of the following raw materials by weight: Langhong base glaze: 400-475 parts of Yaoli glaze fruit, 130-155 parts of quartz, 65-82 parts of kaolin, 3-6 parts of magnesium oxide, 7-11 parts of zinc oxide, 22-30 parts of copper oxide, and 42-55 parts of talc. Langhua Fusion Glaze: Nepheline syenite 580-640 parts, copper oxide 9-11 parts, copper carbonate 18-21 parts, malachite 16-18.5 parts, copper 19.5-21 parts, sericite 36-45 parts, zinc oxide 20-25 parts, dolomite 8-14 parts, rutile 42-60 parts, zirconium silicate 11-15 parts, boron trioxide 5-8 parts, strontium oxide 1.5-3 parts, bentonite 48-55 parts, flint 30-40 parts, and bovine bone 45-65 parts.

[0006] In this invention, the Langhong base glaze contains magnesium oxide, zinc oxide, and talc, which act as strong fluxes to ensure complete melting at specific temperatures, forming a smooth, even, and relatively active glass layer. This provides a suitable liquid interface for the subsequent application of the Langhua fusion glaze, allowing the two glazes to fuse well and preventing delamination or peeling. Appropriate proportions of quartz and kaolin effectively regulate the thermal expansion coefficient of the base glaze, matching it with the thermal expansion coefficients of the ceramic body and the Langhua fusion glaze, thus effectively reducing defects such as glaze peeling. The base glaze also contains some copper oxide, which establishes a preliminary color development foundation during the reduction stage. High-temperature melting allows it to penetrate and blend with the Langhua fusion glaze, resulting in a color that is not merely superficial but rather layered and developed from within.

[0007] In a preferred embodiment, the carbon monoxide content of the strong reducing atmosphere is 4.8%-5.5%, and the carbon monoxide content of the weak reducing atmosphere is 1.6%-1.9%; after the weak reducing atmosphere is heated, it is cooled to 850-900℃ at a rate of 0.6-1℃ / min, and then naturally cooled to room temperature.

[0008] In a preferred embodiment, the Langhua fusion glaze is composed of the following raw materials by weight: 610 parts nepheline syenite, 10 parts copper oxide, 19 parts copper carbonate, 17.5 parts malachite, 20 parts copper, 42 parts sericite, 24 parts zinc oxide, 11 parts dolomite, 54 parts rutile, 13 parts zirconium silicate, 6 parts boron trioxide, 2.5 parts strontium oxide, 52 parts bentonite, 34 parts flint, and 55 parts bovine bone.

[0009] In this invention's Langhua fusion glaze, copper oxide is the most commonly used copper-based coloring material. Its color development is extremely sensitive to the base glaze composition and firing atmosphere. The inventors discovered that simply increasing the amount of copper oxide is insufficient to achieve a deep, uniform red color, as copper ion saturation leads to the precipitation of coarse crystals or the formation of uneven color spots. Therefore, this invention uses a specific ratio of copper oxide, copper carbonate, malachite, and copper as the core coloring materials. Copper carbonate releases a small amount of gas upon heating and decomposition, which not only promotes texture formation but also fine-tunes the local structure of the glaze and promotes copper ion dispersion. Malachite contains other trace elements besides copper; these trace impurities can further act as mineralizers or fluxes, altering the coordination environment of copper ions to promote color development. During high-temperature firing, copper undergoes initial oxidation before entering the subsequent two reducing atmospheres, continuously and stably providing copper ions. This results in finer, more uniform copper colloidal particles in the glaze layer, thus better controlling the color development process. In addition, nepheline syenite, as the main flux, provides alkali metal oxides such as potassium and sodium and introduces alumina, which can lower the melting temperature of the glaze and increase the gloss of the glaze surface.

[0010] In a preferred embodiment, the water-to-ball ratio in S1 for wet grinding is (1.5-3):1:(0.3-0.6), the ball milling speed is 300-500 rpm, and the time is 4-12 h. After ball milling, the process includes sieving to remove iron, aging, and adjusting the specific gravity of the Langhong base glaze slurry and the Langhua fusion glaze slurry to 1.55-1.62 g / cm³. 3 .

[0011] In a preferred embodiment, the glazing method described in S2 is spray glazing, wherein the thickness of the Langhong base glaze slurry applied to the ceramic clay body surface is 0.5-0.8 mm, and the thickness of the Langhua fusion glaze slurry applied to the base glaze is 0.6-1.0 mm.

[0012] As a preferred embodiment, the raw material composition of the ceramic clay blank in S2 is: 320-480 parts of kaolin, 10-20 parts of bentonite, 200-300 parts of quartz, 30-90 parts of waste porcelain powder, 60-100 parts of talc powder, and 160-220 parts of potassium feldspar.

[0013] In one preferred embodiment, the ceramic blank needs to be bisque fired first, with a firing temperature of 900-1000℃, a heating rate of 3-5℃ / min, and a holding time of 30-40 min.

[0014] Another objective of this invention is to provide a Langhonghua glaze fusion glaze prepared by the above-described preparation method.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention provides a Langhong base glaze formula through precise raw material ratio, which not only serves as a carrier layer but also as a functional reaction and buffer platform. This base glaze formula can ensure the stability of the firing process and the tight bonding of the glaze layer, creating important basic conditions for Langhua fusion glaze and overall color development effect.

[0016] 2. Since the coloring behavior of single copper oxide is limited, and the combination of dual raw materials is insufficient to achieve special color effects, and is easily affected by the basic composition of the glaze and the firing atmosphere, this invention introduces copper-based raw materials with different chemical forms. These copper-based raw material combinations exhibit differences in decomposition and oxidation temperatures, allowing copper ions to be released more gradually and continuously throughout the firing process, thus improving color stability. This copper-based raw material combination is also more conducive to forming cuprous oxide colloidal particles of moderate size and uniform distribution, thereby promoting a deep and pure color. Based on a Langhong base glaze, this invention uses a combination of copper oxide, copper carbonate, malachite, and copper as the core, while simultaneously introducing rutile, zinc oxide, zirconium silicate, boron trioxide, and strontium oxide for further color adjustment and crystallization assistance, constructing a composite system fused glaze to obtain a richly colored Langhong glaze.

[0017] 3. For the composite fused glaze system constructed from the selected Langhong base glaze and Langhua fused glaze, this invention also provides a matching multi-stage high-temperature firing process. By optimizing and adjusting the heating parameters and firing atmosphere, the microscopic particles, crystal morphology, and phase separation structure of the glaze layer are precisely controlled, ultimately obtaining the unique color of the Langhong fused glaze (L*=12.0~15.8, a*=70.5~78.2, b*=24.0~30.6). This invention overcomes the shortcomings of existing processes, such as complex firing regimes, high energy consumption, and reliance on experience. It allows for repeatable and stable firing, making it suitable for industrial production. Attached Figure Description

[0018] Figure 1 The glaze appearance of the sample prepared in Example 1 of the present invention.

[0019] Figure 2 The glaze appearance of the sample prepared in Comparative Example 1 of this invention is shown.

[0020] Figure 3 The glaze appearance of the sample prepared in Comparative Example 7 of this invention is shown. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with embodiments. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Example 1 A method for preparing a Langhong flower glaze fusion glaze includes the following steps: 1. Weigh out 440 parts of Yaoli glaze fruit, 142 parts of quartz, 72 parts of kaolin, 5 parts of magnesium oxide, 9 parts of zinc oxide, 26 parts of copper oxide, and 48 parts of talc powder according to the specified weight ratio. Crush and mix these components to obtain Langhong base glaze powder. Add water and zirconium oxide balls to the powder, maintaining a ball-to-material-to-water ratio of 2:1:0.5. Ball mill at 400 rpm for 8 hours. Sieve to remove iron, allow to stand for 48 hours to age, and adjust the specific gravity to 1.58 g / cm³. 3 The base glaze slurry is then obtained for later use.

[0024] 2. Weigh out 610 parts by weight of nepheline syenite, 10 parts by weight of copper oxide, 19 parts by weight of copper carbonate, 17.5 parts by weight of malachite, 20 parts by weight of copper, 42 parts by weight of sericite, 24 parts by weight of zinc oxide, 11 parts by weight of dolomite, 54 parts by weight of rutile, 13 parts by weight of zirconium silicate, 6 parts by weight of boron trioxide, 2.5 parts by weight of strontium oxide, 52 parts by weight of bentonite, 34 parts by weight of flint, and 55 parts by weight of ox bone. Crush and mix these components to obtain Langhua fused glaze powder. Add water and zirconium oxide balls to the powder, with a ball-to-material-to-water ratio of 2.5:1:0.5. Ball mill at 400 rpm for 10 hours. Sieve to remove iron, allow to stand for 48 hours to age, and adjust the specific gravity to 1.60 g / cm³. 3 The resulting fused glaze slurry is then ready for use.

[0025] 3. Weigh out 400 parts kaolin, 15 parts bentonite, 260 parts quartz, 50 parts waste porcelain powder, 85 parts talc powder, and 185 parts potassium feldspar according to the following weight proportions: crush and mix, add water and zirconia balls, with a ball-to-material-to-water ratio of 1.5:1:0.6, ball mill at 300 rpm for 6 hours, sieve to remove iron, dehydrate (moisture content 20%), and let stand for 48 hours to age; press the clay into molds, transfer it to a furnace, and bisque-fire it under air atmosphere conditions by heating from room temperature to 960℃ at 5℃ / min and holding for 35 minutes; then cool it to room temperature with the furnace to obtain ceramic clay blanks.

[0026] 4. Using a glaze sprayer, evenly spray a 0.7 mm base glaze onto the surface of the ceramic clay body. After drying, spray a second 0.8 mm fusion glaze on top of the base glaze and dry to obtain the ceramic glazed body. Place the ceramic glazed body into a sagger and transfer it to an electric-diesel kiln. First, under an oxidizing atmosphere (controlling the oxygen content in the kiln to 2.4%), heat from room temperature to 1035℃ at a rate of 2℃ / min and hold for 30 min. Then, switch to a strong reducing atmosphere (controlling the carbon monoxide content in the kiln to 5.2%) and continue heating to 1195℃ at a rate of 1℃ / min, holding for 15 min. Finally, switch to a weak reducing atmosphere (controlling the carbon monoxide content in the kiln to 1.8%) and continue heating to 1325℃ at a rate of 0.5℃ / min, holding for 40 min. After completion, cool to 880℃ at a rate of 0.8℃ / min, and then allow to cool naturally to room temperature to obtain the Langhonghua glaze fusion glaze ceramic.

[0027] Example 2 A method for preparing a Langhong flower glaze fusion glaze includes the following steps: 1. Weigh out 400 parts of Yaoli glaze fruit, 130 parts of quartz, 65 parts of kaolin, 3 parts of magnesium oxide, 7 parts of zinc oxide, 22 parts of copper oxide, and 42 parts of talc powder according to the specified weight ratio. Crush and mix these components to obtain Langhong base glaze powder. Add water and zirconium oxide balls to the powder, maintaining a ball-to-material-to-water ratio of 2:1:0.5. Ball mill at 400 rpm for 8 hours. Sieve to remove iron, allow to stand for 48 hours to age, and adjust the specific gravity to 1.58 g / cm³. 3 The base glaze slurry is then obtained for later use.

[0028] 2. Weigh out 580 parts by weight of nepheline syenite, 9 parts by weight of copper oxide, 18 parts by weight of copper carbonate, 16 parts by weight of malachite, 19.5 parts by weight of copper, 36 parts by weight of sericite, 20 parts by weight of zinc oxide, 8 parts by weight of dolomite, 42 parts by weight of rutile, 11 parts by weight of zirconium silicate, 5 parts by weight of boron trioxide, 1.5 parts by weight of strontium oxide, 48 parts by weight of bentonite, 30 parts by weight of flint, and 45 parts by weight of ox bone. Crush and mix these components to obtain Langhua fused glaze powder. Add water and zirconium oxide balls to the powder, with a ball-to-material-to-water ratio of 2.5:1:0.5. Ball mill at 400 rpm for 10 hours. Sieve to remove iron, allow to stand for 48 hours to age, and adjust the specific gravity to 1.60 g / cm³. 3 The resulting fused glaze slurry is then ready for use.

[0029] 3. Weigh out 320 parts kaolin, 10 parts bentonite, 200 parts quartz, 30 parts waste porcelain powder, 60 parts talc powder, and 160 parts potassium feldspar according to the following weight proportions: crush and mix, add water and zirconia balls, with a ball-to-material-to-water ratio of 1.5:1:0.6, ball mill at 300 rpm for 6 hours, sieve to remove iron, dehydrate (moisture content 20%), and let stand for 48 hours to age; press the clay into molds, transfer it to a furnace, and bisque-fire it in an air atmosphere by heating from room temperature to 900℃ at 5℃ / min and holding for 40 minutes; then cool it to room temperature with the furnace to obtain ceramic clay blanks.

[0030] 4. Using a glaze sprayer, evenly spray a 0.8 mm base glaze onto the surface of the ceramic clay body. After drying, spray a 0.6 mm fusion glaze on top of the base glaze and dry to obtain a ceramic glazed body. Place the ceramic glazed body into a sagger and transfer it to an electric-diesel kiln. First, under an oxidizing atmosphere (controlling the oxygen content in the kiln to 2.4%), heat from room temperature to 1060℃ at a rate of 2℃ / min and hold for 30 min. Then, switch to a strong reducing atmosphere (controlling the carbon monoxide content in the kiln to 5.5%) and continue heating at a rate of 1℃ / min to 1210℃, holding for 10 min. Finally, switch to a weak reducing atmosphere (controlling the carbon monoxide content in the kiln to 1.6%) and continue heating at a rate of 0.5℃ / min to 1340℃, holding for 30 min. After completion, cool to 900℃ at a rate of 1℃ / min, and then allow to cool naturally to room temperature to obtain Langhonghua glaze fusion glaze ceramic.

[0031] Example 3 A method for preparing a Langhong flower glaze fusion glaze includes the following steps: 1. Weigh out 475 parts of Yaoli glaze fruit, 155 parts of quartz, 82 parts of kaolin, 6 parts of magnesium oxide, 11 parts of zinc oxide, 30 parts of copper oxide, and 55 parts of talc powder according to the specified weight ratio. Crush and mix these components to obtain Langhong base glaze powder. Add water and zirconium oxide balls to the powder, maintaining a ball-to-material-to-water ratio of 2:1:0.5. Ball mill at 400 rpm for 8 hours. Sieve to remove iron, allow to stand for 48 hours to age, and adjust the specific gravity to 1.58 g / cm³. 3 The base glaze slurry is then obtained for later use.

[0032] 2. Weigh out 640 parts by weight of nepheline syenite, 11 parts by weight of copper oxide, 21 parts by weight of copper carbonate, 18.5 parts by weight of malachite, 21 parts by weight of copper, 45 parts by weight of sericite, 25 parts by weight of zinc oxide, 14 parts by weight of dolomite, 60 parts by weight of rutile, 15 parts by weight of zirconium silicate, 8 parts by weight of boron trioxide, 3 parts by weight of strontium oxide, 55 parts by weight of bentonite, 40 parts by weight of flint, and 65 parts by weight of ox bone. Crush and mix these components to obtain Langhua fused glaze powder. Add water and zirconium oxide balls to the powder, with a ball-to-material-to-water ratio of 2.5:1:0.5. Ball mill at 400 rpm for 10 hours. Sieve to remove iron, allow to stand for 48 hours to age, and adjust the specific gravity to 1.60 g / cm³. 3 The resulting fused glaze slurry is then ready for use.

[0033] 3. Weigh out 480 parts of kaolin, 20 parts of bentonite, 300 parts of quartz, 90 parts of waste porcelain powder, 100 parts of talc powder, and 220 parts of potassium feldspar according to the following weight proportions: crush and mix them, add water and zirconia balls, with a ball-to-material-to-water ratio of 1.5:1:0.6, ball mill at 300 rpm for 6 hours, sieve to remove iron, dehydrate (moisture content 20%), and let stand for 48 hours to age; press the clay into molds, transfer it into a furnace, and bisque-fire it under air atmosphere conditions by heating from room temperature to 1000℃ at 5℃ / min and holding for 30 minutes, and then cool it to room temperature with the furnace to obtain ceramic clay blanks.

[0034] 4. Using a glaze sprayer, evenly spray a 0.5 mm base glaze onto the surface of the ceramic clay body. After drying, spray a 1.0 mm fusion glaze on top of the base glaze and dry to obtain the ceramic glazed body. Place the ceramic glazed body into a sagger and transfer it to an electric-diesel kiln. First, under an oxidizing atmosphere (controlling the oxygen content in the kiln to 2.4%), heat from room temperature to 1020℃ at a rate of 2℃ / min and hold for 30 min. Then, switch to a strong reducing atmosphere (controlling the carbon monoxide content in the kiln to 4.8%) and continue heating to 1180℃ at a rate of 1℃ / min, holding for 20 min. Finally, switch to a weak reducing atmosphere (controlling the carbon monoxide content in the kiln to 1.9%) and continue heating to 1305℃ at a rate of 0.5℃ / min, holding for 45 min. After completion, cool to 850℃ at a rate of 0.6℃ / min, and then allow to cool naturally to room temperature to obtain the Langhonghua glaze fusion glaze ceramic.

[0035] Comparative Example 1 The only difference is that instead of using Langhong base glaze, only Langhua fusion glaze is sprayed; otherwise, it is the same as in Example 1.

[0036] Comparative Example 2 The difference is that copper oxide is not added to the raw material of Langhong base glaze powder in step 1, but otherwise it is the same as in Example 1.

[0037] Comparative Example 3 (Copper carbonate was replaced with an equal amount of copper oxide, the most commonly used copper-based colorant) The difference is that in step 2, copper carbonate is not added to the Langhua fusion glaze powder, and the proportions of copper oxide, malachite, and copper are adjusted to 29 parts, 17.5 parts, and 20 parts, respectively. The rest is the same as in Example 1.

[0038] Comparative Example 4 (Malachite was replaced with an equal amount of copper oxide, the most commonly used copper-based colorant) The difference is that malachite is not added to the Langhua fusion glaze powder in step 2, and the proportions of copper oxide, copper carbonate, and copper are adjusted to 27.5 parts, 19 parts, and 20 parts, respectively. The rest is the same as in Example 1.

[0039] Comparative Example 5 (replacing copper with an equal amount of copper oxide, the most commonly used copper-based colorant) The difference is that in step 2, no copper is added to the Langhua fusion glaze powder, and the amounts of copper oxide, copper carbonate, and malachite are adjusted to 30 parts, 19 parts, and 17.5 parts, respectively. The rest is the same as in Example 1.

[0040] Comparative Example 6 The difference is that strontium oxide is not added to the Langhua fusion glaze powder in step 2, otherwise it is the same as in Example 1.

[0041] Comparative Example 7 Referring to Example 1, the difference lies in adjusting the high-temperature firing process parameters in step 4: First, under an oxidizing atmosphere (controlling the oxygen content in the kiln to 2.4%), the temperature is increased from room temperature to 1035°C at a rate of 2°C / min and held for 30 min; then, the temperature is changed to a strong reducing atmosphere (controlling the carbon monoxide content in the kiln to 5.2%), and the temperature is increased to 1325°C at a rate of 1°C / min and held for 15 min; finally, the temperature is changed to a weak reducing atmosphere (controlling the carbon monoxide content in the kiln to 1.8%) and held at a constant temperature for 40 min. After completion, the temperature is cooled to 880°C at a rate of 0.8°C / min, and then allowed to cool naturally to room temperature to obtain the Langhonghua glaze fused glaze ceramic.

[0042] Comparative Example 8 Referring to Example 1, the difference lies in adjusting the high-temperature firing process parameters in step 4: First, under an oxidizing atmosphere (controlling the oxygen content in the kiln to 2.4%), the temperature is increased from room temperature to 1035°C at a rate of 2°C / min and held for 30 min; then, the temperature is changed to a strong reducing atmosphere (controlling the carbon monoxide content in the kiln to 5.2%), and the temperature is increased to 1235°C at a rate of 1°C / min and held for 15 min; finally, the temperature is changed to a weak reducing atmosphere (controlling the carbon monoxide content in the kiln to 1.8%), and the temperature is increased to 1360°C at a rate of 0.5°C / min and held for 40 min. After completion, the temperature is cooled to 880°C at a rate of 0.8°C / min, and then allowed to cool naturally to room temperature to obtain the Langhonghua glaze fused glaze ceramic.

[0043] Test case The colored glaze porcelain samples prepared in Examples 1-3 and Comparative Examples 1-8 were tested, and the results are shown in Table 1 (gloss test according to GB / T 11420-2024; colorimetry test according to GB / T 4739-2015; lead and cadmium migration test according to GB 31604.34-2016; thermal shock resistance test according to GB / T 3298-2022).

[0044] Table 1 Sample test results

[0045] In summary, the Langhonghua glaze fused glaze ceramic prepared by this invention has a pure color, with a stable color intensity within the range of L*=12.0~15.8, a*=70.5~78.2, and b*=24.0~30.6. The glaze surface is oxblood red and contains filamentous or mottled textures. The appearance is full, natural and beautiful, and has good market competitiveness. Comparison Example 1 shows that the lack of a base glaze buffer in the Langhua fusion glaze resulted in a lighter and uneven color. Comparison Example 2 shows that the lack of copper oxide in the Langhong base glaze resulted in a less deep glaze color and reduced glaze quality, leading to defects. Comparison Examples 3-5 show that when the types of copper-based raw materials used were insufficient, the red color of the glaze became significantly lighter, affecting texture formation or causing uneven color development. This was due to an incomplete or unbalanced chemical environment, which failed to produce a good synergistic effect. Comparison Example 6 shows that the lack of strontium oxide as a special and effective flux resulted in localized dark or light colors and significantly reduced color uniformity. Comparison Example 7 shows that when the first stage of strong reduction was raised to the highest firing temperature, and the second stage of weak reduction was kept at a constant temperature, not only did the glaze color become lighter, but the glaze quality also decreased. Comparison Example 8 shows that even a slight increase in firing temperature resulted in a significant decrease in glaze quality. This invention produces a rich, pure red glaze while ensuring high product quality. It overcomes the shortcomings of existing processes, such as complex firing procedures, high energy consumption, and reliance on experience. It can be fired repeatedly and stably, making it suitable for industrial production.

[0046] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they are not intended to limit the present invention. It should be noted that various changes and modifications can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a Langhong flower glaze fusion glaze, characterized in that, Includes the following steps: S1. Weigh out each raw material according to the composition of Langhong base glaze and Langhua fusion glaze, crush and mix them evenly, add water and wet grind to obtain Langhong base glaze slurry and Langhua fusion glaze slurry for later use. S2. First, apply Langhong base glaze slurry to the surface of ceramic clay body and dry it. Then, apply Langhua fusion glaze slurry to the base glaze a second time and dry it to obtain ceramic glaze body. S3. Place the ceramic glaze blank into a sagger and transfer it into an electric kiln for high-temperature firing. After cooling, the Langhonghua glaze fused glaze ceramic is obtained. The specific operation of the high-temperature firing is as follows: First, under an oxidizing atmosphere, the temperature is increased from room temperature to 1020-1060℃ at a rate of 1-3℃ / min and held for 25-35 min; then, the temperature is changed to a strong reducing atmosphere and increased to 1180-1210℃ at a rate of 0.8-1.2℃ / min and held for 10-20 min; finally, the temperature is changed to a weak reducing atmosphere and increased to 1305-1340℃ at a rate of 0.5-0.6℃ / min and held for 30-45 min; the resulting Langhonghua glaze fused glaze ceramic has the following glaze color: L*=12.0~15.8, a*=70.5~78.2, b*=24.0~30.6; The Langhonghua glaze fusion glaze comprises a Langhong base glaze and a Langhua glaze fusion glaze, which are composed of the following raw materials by weight: Langhong base glaze: 400-475 parts of Yaoli glaze fruit, 130-155 parts of quartz, 65-82 parts of kaolin, 3-6 parts of magnesium oxide, 7-11 parts of zinc oxide, 22-30 parts of copper oxide, and 42-55 parts of talc. Langhua Fusion Glaze: Nepheline syenite 580-640 parts, copper oxide 9-11 parts, copper carbonate 18-21 parts, malachite 16-18.5 parts, copper 19.5-21 parts, sericite 36-45 parts, zinc oxide 20-25 parts, dolomite 8-14 parts, rutile 42-60 parts, zirconium silicate 11-15 parts, boron trioxide 5-8 parts, strontium oxide 1.5-3 parts, bentonite 48-55 parts, flint 30-40 parts, and bovine bone 45-65 parts.

2. The method for preparing the Langhong flower glaze fusion glaze according to claim 1, characterized in that, The carbon monoxide content of the strong reducing atmosphere is 4.8%-5.5%, and the carbon monoxide content of the weak reducing atmosphere is 1.6%-1.9%. After the weak reducing atmosphere is heated, it is cooled to 850-900℃ at a rate of 0.6-1℃ / min, and then naturally cooled to room temperature.

3. The method for preparing the Langhong flower glaze fusion glaze according to claim 1, characterized in that, The Langhua fusion glaze is composed of the following raw materials by weight: 610 parts nepheline syenite, 10 parts copper oxide, 19 parts copper carbonate, 17.5 parts malachite, 20 parts copper, 42 parts sericite, 24 parts zinc oxide, 11 parts dolomite, 54 parts rutile, 13 parts zirconium silicate, 6 parts boron trioxide, 2.5 parts strontium oxide, 52 parts bentonite, 34 parts flint, and 55 parts bovine bone.

4. The method for preparing the Langhong flower glaze fusion glaze according to claim 1, characterized in that, In S1, the water-to-ball ratio for wet grinding is (1.5-3):1:(0.3-0.6), the ball mill speed is 300-500 rpm, and the time is 4-12 h. After ball milling, the process includes sieving to remove iron, aging, and adjusting the specific gravity of the Langhong base glaze slurry and the Langhua fusion glaze slurry to 1.55-1.62 g / cm³. 3 .

5. The method for preparing the Langhong flower glaze fusion glaze according to claim 1, characterized in that, The glazing method described in S2 is spray glazing. The thickness of the Langhong base glaze slurry applied to the ceramic clay body is 0.5-0.8 mm, and the thickness of the Langhua fusion glaze slurry applied to the base glaze is 0.6-1.0 mm.

6. The method for preparing the Langhong flower glaze fusion glaze according to claim 1, characterized in that, The raw material composition of the ceramic clay blank described in S2 is as follows: 320-480 parts of kaolin, 10-20 parts of bentonite, 200-300 parts of quartz, 30-90 parts of waste porcelain powder, 60-100 parts of talc powder, and 160-220 parts of potassium feldspar.

7. The method for preparing the Langhong flower glaze fusion glaze according to claim 6, characterized in that, The ceramic blank needs to be bisque fired first, with a firing temperature of 900-1000℃, a heating rate of 3-5℃ / min, and a holding time of 30-40 min.

8. The Langhonghua glaze fusion glaze prepared by the preparation method according to any one of claims 1-7.

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