Formula and preparation process of ceramic bluing glaze water
By using specific raw material combinations and sintering processes, the sintering temperature of splashed blue glaze was reduced, solving the problem of high energy consumption and achieving the preservation of glaze characteristics and performance as well as the improvement of glazing effect.
Patent Information
- Application Number
- CN202411001997.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2026-01-27
AI Technical Summary
The existing blue glaze has a high sintering temperature, resulting in high energy consumption, and the glaze formula and firing process are complex, leading to a low success rate.
Using silicon dioxide, aluminum oxide, iron oxide, calcium oxide, magnesium oxide, titanium oxide, potassium oxide, sodium oxide, cobalt oxide, zirconium oxide and chromium trioxide as raw materials, combined with powder raw materials of specific particle size and water, the glaze is applied by blowing glaze and sintered in an oxidation-reduction atmosphere, with the sintering temperature controlled at 1000-1100℃.
The sintering temperature of the blue glaze was lowered, reducing energy consumption while maintaining the characteristics and properties of the glaze surface, thus improving the glazing effect and the uniformity of the glaze color.
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Figure CN121405360A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of blue glaze, specifically to a ceramic blue glaze water formula and preparation process. Background Technology
[0002] Sprinkled blue glaze, also known as "snowflake blue glaze," originated in Jingdezhen during the Xuande period of the Ming Dynasty, after which production ceased. Production resumed during the Kangxi period of the Qing Dynasty. Sprinkled blue glaze porcelain from the Kangxi, Yongzheng, and Qianlong periods of the Qing Dynasty exhibited stable color and exquisite craftsmanship. Its characteristic feature is a thicker glaze layer in areas of high concentration, while thinner layers reveal the white background, giving the glaze surface the appearance of snowflakes and a vibrant, elegant color. Due to the complex firing process and relatively low success rate, sprinkled blue glaze porcelain was a relatively rare variety at the time. In the late Qing Dynasty, the quality of sprinkled blue glaze porcelain production declined, with the body and glaze quality falling short of those of the early Qing period. The glaze formula and production process of Jun ware have long been lost. Research suggests that it may have involved applying blue glaze to the surface of fired white ware using a bamboo tube dipped in blue glaze, creating spots of varying thickness and depth (referred to in historical texts as "blowing blue"). The key to Jun ware lies in its glaze; the kiln-transformation colors after firing determine its value. White Jun ware includes moon white, fish belly white, ivory white, and jade white, while blue Jun ware includes sky blue, lake blue, powder blue, sapphire blue, and peacock blue. Different firing processes produce different glaze color variations. The glaze formula is also a crucial factor influencing the appearance of the finished Jun ware, and is key to the phenomenon of Jun ware entering the kiln with a single color but emerging with a myriad of colors. Currently, snowflake blue glaze, due to the requirement of sprinkling snowflakes into a bluish-green glaze, demands extremely high standards for raw materials, glazing, and firing processes. Very few can successfully produce it, making it a rare and precious item. Therefore, the oil used for snowflake blue glaze also requires extremely high quality. Currently, the sintering temperature of high-temperature glazes is between 1100-1200℃. Therefore, the sintering process of blue glaze requires a high temperature, resulting in high energy consumption. Summary of the Invention
[0003] To overcome the above shortcomings, this application provides a ceramic blue glaze formula and preparation process, aiming to improve the problem of high energy consumption caused by the high sintering temperature of high-temperature glazes.
[0004] This application provides a ceramic blue glaze formula, the raw materials of which are as follows by mass percentage: the main materials include 60.1-60.88% silicon dioxide, 16.34-30% aluminum oxide, 0-0.28% iron oxide, 0-0.82% calcium oxide, 0-2.28% magnesium oxide, 0-0.1% titanium oxide, 2.2-4.94% potassium oxide, 0-3.46% sodium oxide, 3-5% cobalt oxide, 0-1.2% zirconium oxide, and 0-1.4% chromium trioxide.
[0005] In one specific implementation, water is also included; after the above-mentioned raw materials are mixed, water is added and stirred to form ceramic blue glaze.
[0006] Secondly, this application also provides a process for preparing ceramic blue glaze, including the above-mentioned ceramic blue glaze formula; and the following steps:
[0007] S1. Select and mix ingredients according to the above formula to obtain the blue glaze ingredients;
[0008] S2. Mix the obtained blue glaze material together, add water and stir well, then set aside for later use.
[0009] S3. Take out the above glaze into the vessel, and apply the blue glaze to the ceramic body using the glazing method.
[0010] S4. Sintering with blue glaze: The glazed ceramic body is sent into the kiln for sintering.
[0011] In one specific implementation, in step S1, the raw materials are ground into powder by a grinder and then screened through a filter.
[0012] In one specific implementation, the sieve is selected to be 100-150 mesh.
[0013] In one specific implementation, in step S2, the formula powder is added to the mixing plate in proportion, and water is added to the mixing plate at the same time. The mixture is stirred evenly to obtain blue glaze water.
[0014] In one specific implementation, the ratio of the powdered raw material to water is 1:1.5 to 2.
[0015] In one specific implementation, in step S4, the sintering time is within 8 hours.
[0016] In one specific implementation, the sintering process of the glazed ceramic body involves raising the temperature from room temperature to 900°C in an oxidizing atmosphere, and then raising the temperature from 900°C to 1000-1100°C in a reducing atmosphere.
[0017] In one specific implementation, the heating rate under the oxidizing atmosphere is 300°C / h, and the heating rate under the reducing atmosphere is 100°C / h.
[0018] The beneficial effects of this application are:
[0019] 1. By effectively combining silicon oxide, aluminum oxide, iron oxide, calcium oxide, magnesium oxide, titanium oxide, potassium oxide, sodium oxide, cobalt oxide, zirconium oxide, and chromium trioxide as raw materials, the high-temperature glaze sintering temperature of this application can be carried out at 1000-1100℃, thereby reducing the sintering temperature of the oil without affecting the surface characteristics and performance of the splashed blue glaze, and thus achieving the purpose of reducing energy consumption.
[0020] 2. Filter the blue glaze powder raw material through a filter screen to obtain qualified blue glaze powder raw material. The filter screen selected is 100-150 mesh, so that the obtained blue glaze powder raw material has a particle size between 100-150 mesh. This particle size makes it easy to mix and stir the blue glaze raw material with water, thereby making the obtained blue glaze water uniform and improving the glazing effect of the ceramic body. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0022] Figure 1 This is a flowchart of the ceramic blue glaze formula and preparation process provided in the embodiments of this application;
[0023] Figure 2 A sintering temperature diagram of the ceramic blue glaze formula and preparation process provided for embodiments of this application;
[0024] Figure 3 Examples and comparative statistical charts of ceramic blue glaze formulations and preparation processes provided for embodiments of this application. Detailed Implementation
[0025] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.
[0026] The comparison table and glaze formula used in this application are as follows:
[0027] Comparison table:
[0028] serial number Wolfsbane ash Yaoli Glazed Fruit Pearl Bright Material Tin oxide Copper Flower Nitrogen frit Blue-00 10 30 3 2 7 48 Blue-01 15 40 5 1 9 30
[0029] Table 1 below shows the formula for the blue glaze:
[0030] serial number SiO2 Al2O3 Fe2O3 CaO MgO TiO2 K2O Na2O CoO ZrO2 Cr2O3 Blue-0 60.1 30 - - 2.28 - 2.2 - 4.5 - - Blue-1 67.3 25.1 0.1 0.28 - 0.07 4.17 1.92 3 0.67 0.46 Blue-2 64.49 23.17 0.14 0.41 1.14 0.05 3.57 1.73 4 0.6 0.7 Blue-3 68.88 16.34 0.28 0.82 1.28 0.1 4.94 3.46 5 1.2 1.4
[0031] Example 1
[0032] Please see Figure 1-3 This application provides a ceramic blue glaze water formula, the raw materials of which are as follows by mass percentage: the main materials include 60.1% silicon dioxide, 30% aluminum oxide, 2.28% magnesium oxide, 2.2% potassium oxide, 4.5% cobalt oxide, and water. The above raw materials are mixed and then water is added and stirred to form ceramic blue glaze water.
[0033] The process for preparing ceramic blue glaze includes the above-mentioned ceramic blue glaze formula;
[0034] And the following steps:
[0035] S1. Select and mix ingredients according to the above formula to obtain the blue glaze ingredients;
[0036] S2. Mix the obtained blue glaze material together, add water and stir well, then set aside for later use.
[0037] S3. Take out the above glaze into the vessel, and apply the blue glaze to the ceramic body using the glazing method.
[0038] S4. Sintering with blue glaze: The glazed ceramic body is sent into the kiln for sintering.
[0039] In step S1, the raw materials are ground into powder by a grinder and then screened through a filter screen. Each raw material is ground into powder and then screened through a filter screen to select qualified powder raw materials for making blue glaze.
[0040] The sieve is selected with a mesh size of 100-150. Specifically, this ensures that the particle size of the glaze powder raw material being screened is between 100-150 mesh, which makes it easier for the powder raw material to mix with water during the mixing process and ensures that it is stirred evenly.
[0041] In step S2, the formula powder is added into the mixing plate in proportion, and water is added to the mixing plate at the same time. The mixture is stirred evenly to obtain blue glaze water. The mixing plate is equipped with a mixing tank. Specifically, water is poured into the mixing tank, and then the ingredients of the blue glaze water are poured into the mixing tank in sequence. At the same time, the mixture is stirred and mixed until it is evenly mixed to form blue glaze water.
[0042] The ratio of powdered raw materials to water is 1:1.5 to 2. Depending on the needs, an appropriate amount of water can be added to make blue glaze of different concentrations.
[0043] In step S4, the sintering time is within 8 hours, and the sintering temperature is raised to 900°C within 3-5 hours. During this process, the glaze layer on the surface of the ceramic body begins to melt, and the surface becomes small, unsintered particles. The temperature is raised to 1100°C within 5-7 hours. At this time, the glaze layer on the surface of the ceramic body melts further, and the glaze layer melts into a viscous liquid that flows from top to bottom. The melting of the glaze layer makes the glaze surface flat, and the glaze layer forms a glassy body.
[0044] The sintering process of the glazed ceramic body involves heating from room temperature to 900℃ in an oxidizing atmosphere, then heating from 900℃ to 1100℃ in a reducing atmosphere. After holding at this temperature for 20 minutes, the ceramic body is naturally cooled to room temperature. The finished product is then removed from the kiln to obtain blue-glazed ceramic.
[0045] The heating rate is 300℃ / h under an oxidizing atmosphere and 100℃ / h under a reducing atmosphere.
[0046] The blue glaze formula in this embodiment can reduce the sintering temperature of the ceramic body glaze to 1100℃. At the same time, the finished blue glaze has a uniform distribution of round snowflakes on the surface, a bright glaze color, and a strong jade-like texture.
[0047] Example 2
[0048] Please see Figure 1-3 This application provides a ceramic blue glaze water formula, the raw materials of which are as follows by mass percentage: the main materials include 67.3% silicon dioxide, 25.1% aluminum oxide, 0.1% iron oxide, 0.28% calcium oxide, 0.07% titanium oxide, 4.17% potassium oxide, 1.92% sodium oxide, 3% cobalt oxide, 0.67% zirconium oxide, 0.46% chromium trioxide, and water. The above raw materials are mixed and then water is added and stirred to form ceramic blue glaze water.
[0049] The process for preparing ceramic blue glaze includes the above-mentioned ceramic blue glaze formula;
[0050] And the following steps:
[0051] S1. Select and mix ingredients according to the above formula to obtain the blue glaze ingredients;
[0052] S2. Mix the obtained blue glaze material together, add water and stir well, then set aside for later use.
[0053] S3. Take out the above glaze into the vessel, and apply the blue glaze to the ceramic body using the glazing method.
[0054] S4. Sintering with blue glaze: The glazed ceramic body is sent into the kiln for sintering.
[0055] In step S1, the raw materials are ground into powder by a grinder and then screened through a filter screen. Each raw material is ground into powder and then screened through a filter screen to select qualified powder raw materials for making blue glaze.
[0056] The sieve is selected with a mesh size of 100-150. Specifically, this ensures that the particle size of the glaze powder raw material being screened is between 100-150 mesh, which makes it easier for the powder raw material to mix with water during the mixing process and ensures that it is stirred evenly.
[0057] In step S2, the formula powder is added into the mixing plate in proportion, and water is added to the mixing plate at the same time. The mixture is stirred evenly to obtain blue glaze water. The mixing plate is equipped with a mixing tank. Specifically, water is poured into the mixing tank, and then the ingredients of the blue glaze water are poured into the mixing tank in sequence. At the same time, the mixture is stirred and mixed until it is evenly mixed to form blue glaze water.
[0058] The ratio of powdered raw materials to water is 1:1.5 to 2. Depending on the needs, an appropriate amount of water can be added to make blue glaze of different concentrations.
[0059] In step S4, and with a sintering time of less than 8 hours, the sintering temperature is raised to 900°C within 3-5 hours. During this process, the glaze layer on the surface of the ceramic body begins to melt, and the surface becomes small, unsintered particles. The temperature is raised to 1070°C within 5-7 hours. At this time, the glaze layer on the surface of the ceramic body melts further, and the glaze layer melts into a viscous liquid that flows from top to bottom. The melting of the glaze layer makes the glaze surface flat, and the glaze layer forms a glassy body.
[0060] The sintering process of the glazed ceramic body involves raising the temperature from room temperature to 900℃ in an oxidizing atmosphere, and then raising the temperature from 900℃ to 1070℃ in a reducing atmosphere.
[0061] The heating rate is 300℃ / h under an oxidizing atmosphere and 100℃ / h under a reducing atmosphere.
[0062] The blue glaze formula in this embodiment reduces the sintering temperature of the ceramic body glaze to 1700℃. In addition, the blue glaze surface in this embodiment has a uniform distribution of snowflake-like dots, and the bottle body has a flow pattern.
[0063] Example 3
[0064] Please see Figure 1-3 This application provides a ceramic blue glaze formula, the raw materials of which are as follows by mass percentage: the main materials include 64.49% silicon dioxide, 23.17% aluminum oxide, 0.14% iron oxide, 0.41% calcium oxide, 1.14% magnesium oxide, 0.05% titanium oxide, 3.57% potassium oxide, 1.73% sodium oxide, 4% cobalt oxide, 0.6% zirconium oxide, and 0.7% chromium trioxide, and also include water. The above raw materials are mixed and then water is added and stirred to form ceramic blue glaze.
[0065] The process for preparing ceramic blue glaze includes the above-mentioned ceramic blue glaze formula;
[0066] And the following steps:
[0067] S1. Select and mix ingredients according to the above formula to obtain the blue glaze ingredients;
[0068] S2. Mix the obtained blue glaze material together, add water and stir well, then set aside for later use.
[0069] S3. Take out the above glaze into the vessel, and apply the blue glaze to the ceramic body using the glazing method.
[0070] S4. Sintering with blue glaze: The glazed ceramic body is sent into the kiln for sintering.
[0071] In step S1, the raw materials are ground into powder by a grinder and then screened through a filter screen. Each raw material is ground into powder and then screened through a filter screen to select qualified powder raw materials for making blue glaze.
[0072] The sieve is selected with a mesh size of 100-150. Specifically, this ensures that the particle size of the glaze powder raw material being screened is between 100-150 mesh, which makes it easier for the powder raw material to mix with water during the mixing process and ensures that it is stirred evenly.
[0073] In step S2, the formula powder is added into the mixing plate in proportion, and water is added to the mixing plate at the same time. The mixture is stirred evenly to obtain blue glaze water. The mixing plate is equipped with a mixing tank. Specifically, water is poured into the mixing tank, and then the ingredients of the blue glaze water are poured into the mixing tank in sequence. At the same time, the mixture is stirred and mixed until it is evenly mixed to form blue glaze water.
[0074] The ratio of powdered raw materials to water is 1:1.5 to 2. Depending on the needs, an appropriate amount of water can be added to make blue glaze of different concentrations.
[0075] In step S4, and with a sintering time of less than 8 hours, the sintering temperature is raised to 900°C within 3-5 hours. During this process, the glaze layer on the surface of the ceramic body begins to melt, and the surface becomes small, unsintered particles. The temperature is raised to 1000°C within 5-7 hours. At this time, the glaze layer on the surface of the ceramic body melts further, and the glaze layer melts into a viscous liquid that flows from top to bottom. The melting of the glaze layer makes the glaze surface flat, and the glaze layer forms a glassy body.
[0076] The sintering process of the glazed ceramic body involves raising the temperature from room temperature to 900℃ in an oxidizing atmosphere, and then raising the temperature from 900℃ to 1000℃ in a reducing atmosphere.
[0077] The heating rate is 300℃ / h under an oxidizing atmosphere and 100℃ / h under a reducing atmosphere.
[0078] The blue glaze formula in this embodiment can reduce the sintering temperature of the ceramic body glaze to 1000℃, while the finished blue glaze surface has a uniform distribution of round snowflakes, which is distinctive.
[0079] Example 4
[0080] Please see Figure 1-3This application provides a ceramic blue glaze formula, the raw materials of which are as follows by mass percentage: the main materials include 68.88% silicon dioxide, 16.34% aluminum oxide, 0.28% iron oxide, 0.82% calcium oxide, 1.28% magnesium oxide, 0.1% titanium oxide, 4.94% potassium oxide, 3.46% sodium oxide, 5% cobalt oxide, 1.2% zirconium oxide, and 1.4% chromium trioxide, and also include water. The above raw materials are mixed and then water is added and stirred to form ceramic blue glaze.
[0081] The process for preparing ceramic blue glaze includes the above-mentioned ceramic blue glaze formula;
[0082] And the following steps:
[0083] S1. Select and mix ingredients according to the above formula to obtain the blue glaze ingredients;
[0084] S2. Mix the obtained blue glaze material together, add water and stir well, then set aside for later use.
[0085] S3. Take out the above glaze into the vessel, and apply the blue glaze to the ceramic body using the glazing method.
[0086] S4. Sintering with blue glaze: The glazed ceramic body is sent into the kiln for sintering.
[0087] In step S1, the raw materials are ground into powder by a grinder and then screened through a filter screen. Each raw material is ground into powder and then screened through a filter screen to select qualified powder raw materials for making blue glaze.
[0088] The sieve is selected with a mesh size of 100-150. Specifically, this ensures that the particle size of the glaze powder raw material being screened is between 100-150 mesh, which makes it easier for the powder raw material to mix with water during the mixing process and ensures that it is stirred evenly.
[0089] In step S2, the formula powder is added into the mixing plate in proportion, and water is added to the mixing plate at the same time. The mixture is stirred evenly to obtain blue glaze water. The mixing plate is equipped with a mixing tank. Specifically, water is poured into the mixing tank, and then the ingredients of the blue glaze water are poured into the mixing tank in sequence. At the same time, the mixture is stirred and mixed until it is evenly mixed to form blue glaze water.
[0090] The ratio of powdered raw materials to water is 1:1.5 to 2. Depending on the needs, an appropriate amount of water can be added to make blue glaze of different concentrations.
[0091] In step S4, and with a sintering time of less than 8 hours, the sintering temperature is raised to 900°C within 3-5 hours. During this process, the glaze layer on the surface of the ceramic body begins to melt, and the surface becomes small, unsintered particles. The temperature is raised to 1050°C within 5-7 hours. At this time, the glaze layer on the surface of the ceramic body melts further, and the glaze layer melts into a viscous liquid that flows from top to bottom. The melting of the glaze layer makes the glaze surface flat, and the glaze layer forms a glassy body.
[0092] The sintering process of the glazed ceramic body involves raising the temperature from room temperature to 900℃ in an oxidizing atmosphere, and then raising the temperature from 900℃ to 1050℃ in a reducing atmosphere.
[0093] The heating rate is 300℃ / h under an oxidizing atmosphere and 100℃ / h under a reducing atmosphere.
[0094] The blue glaze formula of this embodiment can reduce the sintering temperature of the ceramic body glaze sintering process to 1050℃, while forming spots of uniform depth on the surface of the blue glaze.
[0095] Comparative Example 1
[0096] A type of splashed blue glaze, the base glaze material ratio is: 10% wolfberry grass ash, 30% Yaoli glaze fruit, 3% pearl glaze, 2% tin oxide, 7% copper flower, and 48% nitrate flocculent;
[0097] The glaze material ratio is: Yaoli glaze fruit 35%, Shouan second lime 20%, and nitrate flocculant 45%;
[0098] The chemical percentage composition of the porcelain body is as follows: SiO2: 74.4%, Al2O3: 20%, Fe2O3: 0.4%, K2O+Na2O: 4%, CaO: 0.3%, MgO: 0.9%.
[0099] After glazing, the porcelain body is placed in a shuttle kiln for firing. An oxidizing atmosphere is used from room temperature to 980℃, and a reducing atmosphere is used above 980℃. The temperature is raised to the highest point of 1150℃ and held for 20 minutes. The body is then allowed to cool naturally to room temperature and removed from the kiln to obtain a porcelain body decorated with blue glaze.
[0100] Comparative Example 2
[0101] A type of splashed blue glaze, the base glaze material ratio is: 15% wolfberry grass ash, 40% Yaoli glaze fruit, 5% pearl glaze, 1% tin oxide, 9% copper flower, and 30% nitrate flocculent.
[0102] The glaze material ratio is: Yaoli glaze fruit 40%, Shouan second lime 30%, and nitrate frit 30%;
[0103] The chemical percentage composition of the porcelain body is as follows: SiO2: 70%, Al2O3: 25%, Fe2O3: 1%, K2O+Na2O: 3%, TiO2: 0.2%, CaO: 0.2%, MgO: 0.6%.
[0104] After glazing, the porcelain body is placed in a shuttle kiln for firing. An oxidizing atmosphere is used from room temperature to 980℃, and a reducing atmosphere is used above 980℃. The temperature is raised to the highest point of 1200℃ and held for 20 minutes. The body is then allowed to cool naturally to room temperature and removed from the kiln to obtain a porcelain body decorated with blue glaze.
[0105] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
Claims
1. A formula for a ceramic blue glaze, characterized in that, The raw materials, by mass percentage, are as follows: the main materials include silicon dioxide 60.1-60.88%, aluminum oxide 16.34-30%, iron oxide 0-0.28%, calcium oxide 0-0.82%, magnesium oxide 0-2.28%, titanium oxide 0-0.1%, potassium oxide 2.2-4.94%, sodium oxide 0-3.46%, cobalt oxide 3-5%, zirconium oxide 0-1.2%, and chromium trioxide 0-1.4%.
2. The ceramic blue glaze formula according to claim 1, characterized in that, It also includes water. After the above raw materials are mixed, water is added and stirred to form ceramic blue glaze.
3. A process for preparing ceramic blue glaze, characterized in that, The ceramic blue glaze formula includes any one of claims 1-2; and the following steps: S1. Select and mix ingredients according to the above formula to obtain the blue glaze ingredients; S2. Mix the obtained blue glaze material together, add water and stir well, then set aside for later use. S3. Take out the above glaze into the vessel, and apply the blue glaze to the ceramic body using the glazing method. S4. Sintering of blue glaze: The glazed ceramic body is sent into the kiln for sintering.
4. The ceramic blue glaze preparation process according to claim 3, characterized in that, In step S1, the raw materials are ground into powder using a grinder and then screened through a filter.
5. The ceramic blue glaze preparation process according to claim 4, characterized in that, The screen used is 100-150 mesh.
6. The ceramic blue glaze preparation process according to claim 3, characterized in that, In step S2, the formula powder is added to the mixing plate in proportion, and water is added to the mixing plate at the same time. The mixture is stirred evenly to obtain blue glaze water.
7. The ceramic blue glaze preparation process according to claim 6, characterized in that, The ratio of the powdered raw material to water is 1:1.5 to 2.
8. The ceramic blue glaze preparation process according to claim 3, characterized in that, In step S4, the sintering time is within 8 hours.
9. The ceramic blue glaze preparation process according to claim 8, characterized in that, The sintering process of the glazed ceramic body involves raising the temperature from room temperature to 900℃ in an oxidizing atmosphere, and then raising the temperature from 900℃ to 1000-1100℃ in a reducing atmosphere.
10. The ceramic blue glaze preparation process according to claim 9, characterized in that, The heating rate is 300℃ / h under the oxidizing atmosphere and 100℃ / h under the reducing atmosphere.