A high-temperature clear blue colored glaze and its preparation method

Abstract

This invention discloses a high-temperature clear blue glaze and its preparation method, belonging to the technical field of high-temperature glazes. The high-temperature clear blue glaze of this invention comprises a base glaze and a colorant. The base glaze is composed of potassium feldspar, quartz, kaolin, calcite, talc, and zinc oxide. The colorant is composed of zircon, dolomite, chromium oxide, azurite, pearlite, praseodymium oxide, cerium oxide, and vanadium pentoxide. By adjusting the formula raw materials and controlling the firing process, this invention prepares a natural and beautiful clear blue glaze with a lustrous, crystalline sheen, resembling the colors of lakes and mountains, while also exhibiting high hardness, high wear resistance, and heat resistance. The glaze surface has high density and good stability, and can be widely used in teaware, tableware, decoration, industry, and many other fields.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature colored glaze technology, specifically relating to a high-temperature clear blue colored glaze and its preparation method. Background Technology

[0002] The preparation of colored glazes is one of the most visually expressive techniques in ceramic decoration. By adding metal oxides as colorants to the glaze and combining them with specific firing conditions, the glaze layer can display a variety of colors such as red, blue, green, purple, black, and cyan. High-temperature colored glazes offer a rich variety of expressive forms. They can be used independently as a creative medium or interact with other materials to create more diverse art forms. By combining colored glazes with elements such as blue and white porcelain, overglaze enamels, and colorants, or by integrating them with art forms such as ceramics and calligraphy, the resulting images can be more vivid, lively, creative, and artistically appealing.

[0003] Traditional colored glazes include celadon glaze (using ferrous iron as a colorant), red glaze (using cuprous oxide as a colorant), and blue glaze (using cobalt as a colorant). The key difference between colored glazes and ordinary glazes lies in the selection of raw materials in the colored glaze formula and the specific high-temperature firing process required to obtain the vibrant colors. To achieve special colors and textures, it is often necessary to blend more different types of metal oxides as colorants. This makes the firing process increasingly difficult to control. While achieving the desired glaze color, it can easily lead to uneven coloring, pinholes, bubbles, and reduced wear or heat resistance on the glaze surface. Summary of the Invention

[0004] In view of the content mentioned in the background art, the purpose of this invention is to provide a high-temperature clear blue colored glaze and its preparation method. By adjusting the formula raw materials and controlling the firing process, this invention prepares a clear blue colored glaze that is natural and beautiful, with a lustrous and crystal clear appearance, resembling the scenery of lakes and mountains, while also possessing high hardness, high wear resistance, and heat resistance.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] This invention provides a high-temperature clear blue colored glaze, comprising a base glaze and a colorant, which are composed of the following raw materials in parts by weight:

[0007] Base glaze: 40-52 parts potassium feldspar, 18-26 parts quartz, 13-19 parts kaolin, 5-11 parts calcite, 3-8 parts talc, 2-5 parts zinc oxide;

[0008] Colorant: 14-20 parts zircon, 4-7 parts dolomite, 3.5-4.8 parts chromium oxide, 1.2-1.4 parts azurite, 0.05-0.15 parts pearlite, 0.18-0.3 parts praseodymium oxide, 0.15-0.45 parts cerium oxide, and 0.12-0.28 parts vanadium pentoxide.

[0009] Furthermore, the mass ratio of the base glaze to the colorant is (86-92):(8-14).

[0010] Furthermore, the colorant is composed of the following raw materials by weight: 16 parts zircon, 6 parts dolomite, 4.2 parts chromium oxide, 1.4 parts azurite, 0.08 parts pearlite, 0.26 parts praseodymium oxide, 0.3 parts cerium oxide, and 0.22 parts vanadium pentoxide.

[0011] This invention also provides a method for preparing the above-mentioned high-temperature clear blue colored glaze, comprising the following steps:

[0012] Step 1: Weigh the raw materials for the base glaze and colorant according to the formula, and crush them for later use;

[0013] Step 2: Mix the base glaze and colorant powder, add water and ball mill to obtain a glaze slurry for later use;

[0014] Step 3: Apply glaze slurry to the surface of the ceramic clay body, dry it, and then transfer it to the kiln for high-temperature firing at 1290-1330℃. After cooling, the Qinglan colored glaze porcelain is obtained.

[0015] Furthermore, in step two, after mixing the powders, the ball milling ratio is (4-5):(6-8):1, the ball milling speed is 400-500 rpm, and the powders are milled to a particle size D. 50 The thickness is 2-4 μm; after ball milling, the specific gravity of the glaze slurry needs to be adjusted to 1.60-1.64 g / mL.

[0016] Furthermore, the raw material formula for the ceramic clay blank in step three is as follows: 35-45 parts by weight of kaolin, 30-40 parts by weight of talc, 15-24 parts by weight of feldspar, 5-10 parts by weight of quartz, and 3-6 parts by weight of bentonite; the firing parameters are: heating rate of 4-5℃ / min, heating to 900-950℃ and holding for 20-40 min, and cooling to room temperature with the furnace.

[0017] Furthermore, the glazing method described in step three is immersion glazing, with a coating thickness of 0.4 mm.

[0018] Furthermore, the high-temperature firing described in step three employs a programmed temperature increase, specifically as follows: First, air is introduced into the furnace, and the temperature is raised from room temperature to 400-420℃ at a rate of 100-120℃ / h. Then, the temperature is raised to 920-960℃ at a rate of 250-300℃ / h and held for 20-30 minutes. Subsequently, the air supply is reduced, additional carbon is added, and the CO content in the atmosphere is controlled at 3%. The temperature is then raised to 1060-1100℃ at a rate of 100-120℃ / h. Finally, the additional carbon addition is stopped to eliminate CO, and the temperature is raised to 1290-1330℃ at a rate of 60-80℃ / h and held for 30-40 minutes.

[0019] Furthermore, after the high-temperature firing in step three is completed, the temperature is first reduced to 650-700℃ at a rate of 80-100℃ / h, and then cooled to room temperature along with the furnace.

[0020] Furthermore, the glaze color of the obtained Qinglan colored glaze porcelain is: L*=41.9~44.3, a*=-43.1~-41.2, b*=-24.4~-23.2.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The colorant of this invention is based on chromium oxide, azurite, and pearlite as the core components, while praseodymium oxide, cerium oxide, and vanadium pentoxide are introduced to assist in color adjustment, so as to synergistically produce a blue-green transition, thereby obtaining the target clear blue color. This invention mixes the selected colorant with the base glaze in an appropriate ratio to form a glaze, and also provides a blank. The glaze slurry made from the glaze is dipped onto the surface of the ceramic blank, which has been pre-shaped and bisque-fired, and then subjected to a two-stage firing. The selected base glaze not only provides an ideal melting environment and protective layer for the colorant, but also promotes its uniform dispersion and stable color development. The blank mainly matches the colorant and base glaze, thereby stabilizing the glaze layer and reducing defects.

[0023] 2. The two-stage firing process of this invention adopts a staged heating firing process. By finely adjusting the light oxidation / light reduction / neutral atmosphere at the corresponding temperature stages, a pure and full blue-green color is obtained. This process avoids defects such as bubbles and pinholes while also improving the hardness, wear resistance and thermal shock resistance of the product.

[0024] 3. The color of the Qinglan colored glaze obtained by this invention is stable between L*=41.9~44.3, a*=-43.1~-41.2, and b*=-24.4~-23.2. It resembles the scenery of lakes and mountains, is naturally beautiful, and is understated and serene. It is not only beautiful but also has high hardness, high wear resistance, heat resistance and other functional properties. It can be widely used in many fields such as teaware, tableware, decoration and industry. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] Example 1

[0028] A method for preparing a high-temperature clear blue color includes the following steps:

[0029] 1. Weigh out 46 parts by weight of potassium feldspar, 24 parts by weight of quartz, 15 parts by weight of kaolin, 7 parts by weight of calcite, 6 parts by weight of talc, and 4 parts by weight of zinc oxide. Powder and mix these components to prepare the base glaze powder. Weigh out 16 parts by weight of zircon, 6 parts by weight of dolomite, 4.2 parts by weight of chromium oxide, 1.4 parts by weight of azurite, 0.08 parts by weight of pearlite, 0.26 parts by weight of praseodymium oxide, 0.3 parts by weight of cerium oxide, and 0.22 parts by weight of vanadium pentoxide. Powder and mix these components to prepare the colorant powder. Mix the above base glaze powder and colorant powder at a mass ratio of 9:1. Add water and zirconium oxide balls to the resulting mixture and wet mill at 500 rpm until the particle size D is reached. 50 The glaze slurry was 3 μm thick; the obtained glaze slurry was sieved to remove iron, allowed to stand for 48 h to age, and the specific gravity was adjusted to 1.62 g / mL for later use.

[0030] 2. Weigh out 40 parts kaolin, 35 parts talc, 20 parts feldspar, 8 parts quartz, and 5 parts bentonite by weight. Crush and mix them, then add water and zirconia balls for wet grinding. The ratio of material, balls, and water is 4:5:1. Grind at 500 rpm until the particle size D is reached. 50 The thickness is 20 μm; the obtained slurry is sieved to remove iron, dehydrated (moisture content 20%), and left to stand for 30 h for aging; the obtained clay is molded (25 MPa), transferred to a furnace and fired in an air atmosphere at 4℃ / min from room temperature to 920℃ for 30 min, and then cooled to room temperature with the furnace to obtain ceramic blanks.

[0031] 3. The glaze slurry is evenly coated onto the surface of the ceramic clay body (0.4 mm thickness) through dipping. After drying, it is transferred to a kiln for programmed heating: First, air is introduced into the kiln (controlling the O2 content in the atmosphere to 1.5%), and the temperature is raised from room temperature to 420℃ at 120℃ / h, then raised to 950℃ at 250℃ / h and held for 25 min; subsequently, the air supply is reduced, additional carbon is added, and the CO content in the atmosphere is controlled to 3%, and the temperature is continued to rise to 1100℃ at 100℃ / h; finally, the additional carbon addition is stopped to eliminate CO (controlling the O2 content in the atmosphere to not exceed 0.01%), and the temperature is continued to rise to 1310℃ at 70℃ / h and held for 40 min. After firing, the temperature is lowered to 680℃ at 90℃ / h, and then cooled to room temperature in the kiln to obtain the Qinglan colored glaze porcelain product.

[0032] Example 2

[0033] A method for preparing a high-temperature clear blue color includes the following steps:

[0034] 1. Weigh out 40 parts by weight of potassium feldspar, 18 parts by weight of quartz, 13 parts by weight of kaolin, 5 parts by weight of calcite, 3 parts by weight of talc, and 2 parts by weight of zinc oxide. Powder and mix these components to prepare the base glaze powder. Weigh out 14 parts by weight of zircon, 4 parts by weight of dolomite, 3.5 parts by weight of chromium oxide, 1.2 parts by weight of azurite, 0.05 parts by weight of pearlite, 0.18 parts by weight of praseodymium oxide, 0.15 parts by weight of cerium oxide, and 0.12 parts by weight of vanadium pentoxide. Powder and mix these components to prepare the colorant powder. Mix the above base glaze powder and colorant powder at a mass ratio of 92:8. Add water and zirconium oxide balls to the resulting mixture and wet-mill at 500 rpm until the particle size D is reached. 50 The glaze slurry was 2 μm thick; the obtained glaze slurry was sieved to remove iron, allowed to stand for 48 h to age, and the specific gravity was adjusted to 1.6 g / mL for later use.

[0035] 2. Weigh out 35 parts kaolin, 30 parts talc, 15 parts feldspar, 5 parts quartz, and 3 parts bentonite by weight. Crush and mix them, then add water and zirconia balls for wet grinding. The ratio of material, balls, and water is 4:5:1. Grind at 500 rpm until the particle size D is reached. 50 The thickness is 20 μm; the obtained mud slurry is sieved to remove iron, dehydrated (moisture content 20%), and left to stand for 30 h for aging; the obtained mud material is molded (25 MPa), transferred into the furnace and fired in air atmosphere at 5℃ / min from room temperature to 900℃ for 40 min, and then cooled to room temperature with the furnace to obtain ceramic clay blanks.

[0036] 3. The glaze slurry is evenly coated onto the surface of the ceramic clay body (0.4 mm thickness) through dipping. After drying, it is transferred to a kiln for programmed heating: First, air is introduced into the kiln (controlling the O2 content in the atmosphere to 1.5%), and the temperature is raised from room temperature to 420℃ at 120℃ / h, then raised to 960℃ at 300℃ / h and held for 20 min; subsequently, the air supply is reduced, additional carbon is added, and the CO content in the atmosphere is controlled to 3%, and the temperature is continued to rise to 1060℃ at 100℃ / h; finally, the additional carbon addition is stopped to eliminate CO (controlling the O2 content in the atmosphere to not exceed 0.01%), and the temperature is continued to rise to 1330℃ at 80℃ / h and held for 30 min. After firing, the temperature is lowered to 700℃ at 100℃ / h, and then cooled to room temperature in the kiln to obtain the Qinglan colored glaze porcelain product.

[0037] Example 3

[0038] A method for preparing a high-temperature clear blue color includes the following steps:

[0039] 1. Weigh out 52 parts by weight of potassium feldspar, 26 parts by weight of quartz, 19 parts by weight of kaolin, 11 parts by weight of calcite, 8 parts by weight of talc, and 5 parts by weight of zinc oxide. Powder and mix these components to prepare the base glaze powder. Weigh out 20 parts by weight of zircon, 7 parts by weight of dolomite, 4.8 parts by weight of chromium oxide, 1.3 parts by weight of azurite, 0.15 parts by weight of pearlite, 0.3 parts by weight of praseodymium oxide, 0.45 parts by weight of cerium oxide, and 0.28 parts by weight of vanadium pentoxide. Powder and mix these components to prepare the colorant powder. Mix the above base glaze powder and colorant powder at a mass ratio of 86:14. Add water and zirconium oxide balls to the resulting mixture and wet-mill at 400 rpm until the particle size D is reached. 50 The glaze slurry was sieved to remove iron, allowed to stand for 48 h to age, and its specific gravity was adjusted to 1.64 g / mL for later use.

[0040] 2. Weigh out 45 parts kaolin, 40 parts talc, 24 parts feldspar, 10 parts quartz, and 6 parts bentonite by weight. After crushing and mixing, add water and zirconia balls for wet grinding. The ratio of material, balls, and water is 4:5:1. Grind at 500 rpm until the particle size D is reached. 50 The thickness is 20 μm; the obtained mud slurry is sieved to remove iron, dehydrated (moisture content 20%), and left to stand for 30 h for aging; the obtained mud material is molded (25 MPa), transferred into the furnace and fired in air atmosphere at 5℃ / min from room temperature to 950℃ for 20 min, and then cooled to room temperature with the furnace to obtain ceramic clay blanks.

[0041] 3. The glaze slurry is evenly coated onto the surface of the ceramic clay body (0.4 mm thickness) through dipping. After drying, it is transferred to a kiln for programmed heating: First, air is introduced into the kiln (controlling the O2 content in the atmosphere to 1.5%), and the temperature is raised from room temperature to 400℃ at a rate of 100℃ / h. Then, the temperature is raised to 920℃ at a rate of 250℃ / h and held for 30 min. Subsequently, the air supply is reduced, additional carbon is added, and the CO content in the atmosphere is controlled to 3%. The temperature is then raised to 1100℃ at a rate of 120℃ / h. Finally, the additional carbon addition is stopped to eliminate CO (controlling the O2 content in the atmosphere to no more than 0.01%), and the temperature is raised to 1290℃ at a rate of 60℃ / h and held for 40 min. After firing, the temperature is lowered to 650℃ at a rate of 80℃ / h, and then cooled to room temperature in the kiln to obtain the Qinglan colored glaze porcelain product.

[0042] Comparative Example 1

[0043] Referring to the steps and parameters of Example 1, the difference is that the raw materials of the colorant formula in step 1 are changed to: 16 parts zircon, 6 parts dolomite, 5.6 parts chromium oxide, 0.08 parts pearlite, 0.26 parts praseodymium oxide, 0.3 parts cerium oxide, and 0.22 parts vanadium pentoxide.

[0044] Comparative Example 2

[0045] Referring to the steps and parameters of Example 1, the difference is that the raw materials of the colorant formula in step 1 are changed to: 16 parts zircon, 6 parts dolomite, 4.2 parts chromium oxide, 1.4 parts azurite, 0.26 parts praseodymium oxide, 0.3 parts cerium oxide, and 0.22 parts vanadium pentoxide.

[0046] Comparative Example 3

[0047] Referring to the steps and parameters of Example 1, the difference is that the raw materials of the colorant formula in step 1 are changed to: 16 parts zircon, 6 parts dolomite, 4.2 parts chromium oxide, 1.4 parts azurite, 0.08 parts pearlite, 0.3 parts cerium oxide, and 0.22 parts vanadium pentoxide.

[0048] Comparative Example 4

[0049] Referring to the steps and parameters of Example 1, the difference is that the raw materials of the colorant formula in step 1 are changed to: 16 parts zircon, 6 parts dolomite, 4.2 parts chromium oxide, 1.4 parts azurite, 0.08 parts pearlite, 0.26 parts praseodymium oxide, and 0.3 parts cerium oxide.

[0050] Comparative Example 5

[0051] Referring to the steps and parameters in Example 1, the difference lies in the adjustment of the programmed heating and high-temperature firing steps in step 3: First, air is introduced into the furnace (controlling the O2 content in the atmosphere to 1.5%), and the temperature is raised from room temperature to 950°C at 120°C / h, and held for 25 min; then, the air supply is reduced, additional carbon is added, and the CO content in the atmosphere is controlled to 3%, and the temperature is raised to 1100°C at 100°C / h; finally, the additional carbon is stopped to eliminate CO (controlling the O2 content in the atmosphere to not exceed 0.01%), and the temperature is raised to 1310°C at 70°C / h, and held for 40 min.

[0052] Comparative Example 6

[0053] Referring to the steps and parameters in Example 1, the difference lies in the adjustment of the programmed heating and high-temperature firing steps in step 3: First, air is introduced into the furnace (controlling the O2 content in the atmosphere to 1.5%), and the temperature is raised from room temperature to 420°C at a rate of 120°C / h, then raised to 950°C at a rate of 250°C / h, and held for 25 min; then the air supply is reduced, additional carbon is added, and the CO content in the atmosphere is controlled to 6%, and the temperature is further raised to 1100°C at a rate of 100°C / h; finally, the additional carbon is stopped to eliminate CO (controlling the O2 content in the atmosphere to not exceed 0.01%), and the temperature is further raised to 1310°C at a rate of 70°C / h, and held for 40 min.

[0054] Comparative Example 7

[0055] Referring to the steps and parameters in Example 1, the difference lies in the adjustment of the programmed heating and high-temperature firing steps in step 3 as follows: First, air is introduced into the furnace (controlling the O2 content in the atmosphere to 1.5%), and the temperature is raised from room temperature to 420°C at a rate of 120°C / h. Then, the temperature is raised to 950°C at a rate of 250°C / h and held for 25 minutes. Subsequently, the air supply is reduced, additional carbon is added, and the CO content in the atmosphere is controlled to 3%. The temperature is then raised to 1100°C at a rate of 100°C / h. Finally, the temperature is raised to 1310°C at a rate of 70°C / h and held for 40 minutes.

[0056] Test case

[0057] The colored glaze porcelain samples prepared in Examples 1-3 and Comparative Examples 1-7 were tested, and the results are shown in Tables 1 and 2. (Brightness and color were tested according to GB / T 4739-2015; abrasion resistance was tested using a Taber abrasion tester (500g load); lead and cadmium migration was tested according to GB 31604.34-2016; water absorption was tested according to GB / T 3299-2011; thermal shock resistance was tested according to GB / T 3298-2022)

[0058] Table 1. Appearance and color of sample glaze

[0059]

[0060] Table 2 Sample performance test results

[0061]

[0062] According to the glaze appearance and color data in Table 1, this invention produces a smooth, pure, uniform, and warm blue-green glaze—Qinglan Color Glaze—with color values ​​between L*=41.9~44.3, a*=-43.1~-41.2, and b*=-24.4~-23.2, resembling the beauty of lakes and mountains, naturally beautiful, understated and serene. Furthermore, according to the sample performance test results in Table 2, this invention ensures high product quality while satisfying the glaze color requirements, and also achieves high hardness, high wear resistance, and heat resistance, making it widely applicable in numerous fields such as teaware, tableware, decoration, and industry.

[0063] 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 high-temperature clear blue colored glaze, characterized in that, Includes the following steps: Step 1: Weigh the raw materials for the base glaze and colorant according to the formula, and crush them for later use; Step 2: Mix the base glaze and colorant powder, add water and ball mill to obtain a glaze slurry for later use; Step 3: Apply glaze slurry to the surface of the ceramic clay body, dry it, and then transfer it to the kiln for high-temperature firing at 1290-1330℃. After cooling, the Qinglan colored glaze porcelain is obtained. In step three, the high-temperature firing process employs a programmed temperature increase, specifically as follows: First, air is introduced into the furnace, and the temperature is raised from room temperature to 400-420℃ at a rate of 100-120℃ / h. Then, the temperature is raised to 920-960℃ at a rate of 250-300℃ / h and held for 20-30 minutes. Subsequently, the air flow rate is reduced, additional carbon is added, and the CO content in the atmosphere is controlled at 3%. The temperature is then raised to 1060-1100℃ at a rate of 100-120℃ / h. Finally, the additional carbon addition is stopped to eliminate CO, and the temperature is raised to 1290-1330℃ at a rate of 60-80℃ / h and held for 30-40 minutes. After the high-temperature firing is completed, the temperature is first lowered to 650-700℃ at a rate of 80-100℃ / h, and then cooled to room temperature along with the furnace. The base glaze and colorant are composed of the following raw materials in parts by weight: Base glaze: 40-52 parts potassium feldspar, 18-26 parts quartz, 13-19 parts kaolin, 5-11 parts calcite, 3-8 parts talc, 2-5 parts zinc oxide; Colorant: 14-20 parts zircon, 4-7 parts dolomite, 3.5-4.8 parts chromium oxide, 1.2-1.4 parts azurite, 0.05-0.15 parts pearlite, 0.18-0.3 parts praseodymium oxide, 0.15-0.45 parts cerium oxide, 0.12-0.28 parts vanadium pentoxide; The mass ratio of the base glaze to the colorant is (86-92):(8-14).

2. The method for preparing high-temperature clear blue colored glaze according to claim 1, characterized in that, The colorant is composed of the following raw materials by weight: 16 parts zircon, 6 parts dolomite, 4.2 parts chromium oxide, 1.4 parts azurite, 0.08 parts pearlite, 0.26 parts praseodymium oxide, 0.3 parts cerium oxide, and 0.22 parts vanadium pentoxide.

3. The method for preparing high-temperature clear blue colored glaze according to claim 1, characterized in that, Step 2: After mixing the powders, add water and ball mill at a powder-to-water ratio of (4-5):(6-8):

1. The ball mill speed is 400-500 rpm. Ball mill until the particle size D is reached. 50 The thickness is 2-4 μm, and after ball milling, the specific gravity of the glaze slurry needs to be adjusted to 1.60-1.64 g / mL.

4. The method for preparing high-temperature clear blue colored glaze according to claim 1, characterized in that, The raw material formula for the ceramic clay blank in step three is as follows: 35-45 parts by weight of kaolin, 30-40 parts by weight of talc, 15-24 parts by weight of feldspar, 5-10 parts by weight of quartz, and 3-6 parts by weight of bentonite; the firing parameters are: heating rate of 4-5℃ / min, heating to 900-950℃ and holding for 20-40 minutes, and cooling to room temperature with the furnace.

5. The method for preparing high-temperature clear blue colored glaze according to claim 1, characterized in that, The glazing method described in step three is immersion glazing, with a coating thickness of 0.4 mm.

6. The method for preparing high-temperature clear blue colored glaze according to claim 1, characterized in that, The resulting Qinglan colored glaze porcelain has the following glaze color values: L*=41.9~44.3, a*=-43.1~-41.2, b*=-24.4~-23.2.

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