High-temperature underglaze Chinese red glaze as well as preparation method and sintering process thereof
By using rare earth and chromium composite coloring and nano-encapsulation technology, the problem of unstable red glaze color under high temperature has been solved, achieving a bright, stable, non-toxic, and environmentally friendly glaze effect at high temperatures. It is applicable to a variety of glazing methods and has wide adaptability.
Patent Information
- Application Number
- CN202511457331.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-13
- Publication Date
- 2025-12-16
AI Technical Summary
In existing technologies, the high-temperature underglaze red glaze turns dark, has an incorrect color, and lacks saturation after firing. Furthermore, traditional glazes contain toxic heavy metals, making it difficult to stably present a bright red color at high temperatures.
By employing rare earth and chromium composite coloring and combining heterogeneous encapsulation technology and nano-encapsulation technology, high-temperature red pigments, glaze matrix and related additives are used to prepare high-temperature underglaze Chinese red glaze through high-energy ball milling, spray drying and high-temperature calcination. Combined with the firing process under oxidizing or weak reducing atmosphere, the stability of pigments and the brightness of glaze color are ensured.
It achieves bright and stable glaze color at high temperatures, avoids the use of toxic heavy metals, has wide process adaptability, can be applied in a variety of glazing methods, and has a delicate and saturated glaze color, possessing high artistic value and practicality.
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Abstract
Description
TECHNICAL FIELD
[0002] The present application relates to the field of high-temperature color glaze design and sintering, and relates to a high-temperature underglaze Chinese red color glaze and a preparation method and a sintering process thereof. BACKGROUND
[0004] The ceramic color of the Chinese red color glaze after sintering is bright and colorful like the national flag, and is bright red, moist and bright, which is one of the most precious glazes in ceramic color glazes. The big red color represents auspiciousness, wealth and happiness, and symbolizes celebration, which is a color that people have always loved. However, the sintering of the big red color glaze ceramic product is extremely difficult, because the color glaze is extremely unstable in high temperature, and is very sensitive to the atmosphere of the kiln during sintering. A slight change will not achieve the desired effect. It is very difficult to obtain a big red color glaze ceramic product with a relatively pure color. In order to mass-produce this precious glaze, ceramic technicians have made a lot of efforts, and occasionally a few products can be sintered in the process of continuous exploration, but mass production is often unsuccessful. In a relatively low temperature (lower than 1000℃), the big red color is relatively stable and easy to control, but the lead and cadmium dissolution of the ceramic product sintered at low temperature does not meet the requirements, which will cause harm to human health during use. Therefore, if such a big red color glaze ceramic product with a bright and colorful color like the national flag can be developed in high-temperature underglaze products and industrialized, it will bring unique color effects to high-temperature underglaze ceramic products, and improve the competitiveness of enterprises. SUMMARY
[0006] The present application aims to overcome the above technical deficiencies, and provides a high-temperature underglaze Chinese red color glaze and a preparation method and a sintering process thereof, which solves the technical problem of the existing technology that the red color glaze sintered at high temperature is dark, not correct, and not saturated enough.
[0007] To achieve the above technical purpose, the technical scheme of the present application provides a high-temperature underglaze Chinese red color glaze, which comprises a high-temperature red color material, a glaze base body and related additives. The raw materials of the Chinese red color glaze, calculated by mass percentage, comprise 15-35 parts of high-temperature red color material, 60-80 parts of glaze base body, and 5-10 parts of related additives.
[0008] In any embodiment, the high-temperature red color material comprises a base material and a colorant, and calculated by mass percentage, comprises 5-23 parts of base material and 10-12 parts of colorant; wherein the base material is one or more of yttrium oxide, zirconium oxide, cerium oxide, neodymium oxide and strontium oxide; and the colorant is one or more of chromium sesquioxide, chicken blood stone and iron red.
[0009] In any embodiment, the glaze matrix is one or more of potassium feldspar, muscovite, quartz sand, boric acid, and wollastonite.
[0010] In any embodiment, the relevant additives include plasticizers, dispersants, and mineralizers, and by mass percentage, include 2-4 parts of plasticizer, 1-3 parts of dispersant, and 2-3 parts of mineralizer; the plasticizer is one or more of montmorillonite, sodium silicate, nano-calcium carbonate, and vapor-deposited nano-silica; the dispersant is one or more of sodium tripolyphosphate and β-cyclodextrin; and the mineralizer is one or more of sodium hexafluoroaluminate and sodium fluoride.
[0011] Furthermore, this invention also proposes the above-mentioned high-temperature underglaze Chinese red glaze preparation method and firing process, including the following steps:
[0012] (A) Preparation of high-temperature red pigment:
[0013] A1. Add the base material and colorant to the grinding aid and deionized water, and use a ball mill for high-energy ball milling until the particle size reaches the nano or submicron level.
[0014] A2. The mixture of base material and colorant obtained in step A1 is uniformly dispersed using a high-speed mixer. Then, the mixture slurry is spray-dried to obtain dried colorant powder.
[0015] A3. After drying, the powder is protected in an inert gas atmosphere and calcined at 1100~1200℃ for 4~10 hours. After being crushed and passed through a 500~1000 mesh sieve, a high-temperature red pigment is obtained.
[0016] (B) Preparation of basic glaze slurry:
[0017] B1. Weigh and mix the components of the glaze matrix.
[0018] B2. Add deionized water and dispersant and ball mill until the glaze slurry can usually pass through a 325~500 mesh sieve.
[0019] (C) Slurry integration:
[0020] C1. Add the prepared high-temperature red pigment to the base glaze slurry.
[0021] C2. After adding the plasticizer and mineralizer in proportion, all components are thoroughly stirred and mixed evenly to obtain the high-temperature underglaze Chinese red glaze.
[0022] This invention also proposes a high-temperature underglaze Chinese red glaze firing process, including the following steps:
[0023] D1. First, slowly raise the temperature to 1130~1150℃ in an oxidizing atmosphere and calcine at the bisque firing temperature for 3~4 hours to fully remove organic matter and moisture from the body and glaze.
[0024] D2. Heat to 1300~1400℃ in an oxidizing or weakly reducing atmosphere, calcine at high temperature for 6~10 hours, and then cool naturally to room temperature after calcination.
[0025] In addition, the present invention also proposes the application of the above-mentioned high-temperature underglaze Chinese red glaze or the high-temperature underglaze Chinese red glaze prepared and sintered by the above-mentioned preparation method in high-temperature underglaze applications.
[0026] Compared with existing technologies, the beneficial effects of this invention include: the Chinese red high-temperature underglaze glaze proposed in this invention is environmentally friendly and has high-temperature stability. Due to the use of rare earth and chromium composite coloring combined with heterogeneous encapsulation technology and nano-encapsulation technology, the colorant does not contain traditional toxic heavy metals such as cadmium and lead, and can maintain a bright and stable color in oxidizing or weakly reducing atmospheres up to 1200~1300℃; in addition, it has wide process adaptability. By adjusting the amount of additives such as plasticizers and suspending agents, the rheological properties of the slurry can be flexibly changed, making it suitable for various glazing methods. The introduced mineralizer also helps to appropriately reduce the firing temperature; moreover, and most importantly, it has excellent color. The use of rare earth elements can produce a unique and pure red tone, and the nano-sized colorant particles help to obtain a more delicate and saturated glaze color. Attached Figure Description Figure 1 It is a ceramic plate fired with high-temperature underglaze red glaze obtained in Example 1 of this invention. Figure 2 It is a ceramic plate fired with high-temperature underglaze red glaze obtained in Example 2 of this invention. Figure 3 It is a ceramic plate fired with high-temperature underglaze red glaze obtained in Example 3 of the present invention. Figure 4 This is a ceramic slab fired with underglaze red glaze, prepared as Comparative Example 1 of this invention. Figure 5 This is a ceramic slab fired with underglaze red glaze, prepared as Comparative Example 2 of this invention. Figure 6 This is a ceramic slab fired with underglaze red glaze, prepared as Comparative Example 3 of this invention. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0029] In this invention, the terms "some embodiments," "this embodiment," and examples are used to describe a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.
[0030] If the application documents contain similar descriptions such as "first / second", the following explanation shall be added: In the following description, the terms "first / second / third" are used only to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.
[0031] In this embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.
[0032] The following describes embodiments of this application. The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all conventional products that can be obtained commercially.
[0033] Example 1
[0034] This embodiment proposes a high-temperature underglaze Chinese red glaze. The raw materials, calculated by mass percentage, include a high-temperature red pigment, which contains 5 parts of yttrium oxide as the base material and 10 parts of chromium trioxide as the colorant; 80 parts of potassium feldspar as the glaze matrix; and 5 parts of additives, which contain 2 parts of montmorillonite as a plasticizer, 1 part of sodium tripolyphosphate as a dispersant, and 2 parts of sodium hexafluoroaluminate as a mineralizer.
[0035] The high-temperature underglaze Chinese red glaze of this embodiment is prepared by the following steps:
[0036] Preparation of high-temperature red pigment:
[0037] A1. Add yttrium oxide and chromium trioxide to the grinding aid and deionized water, and use a ball mill for high-energy ball milling until the particle size reaches the submicron level;
[0038] A2. The mixture of yttrium oxide and chromium trioxide obtained in step A1 is uniformly dispersed using a high-speed mixer. The mixture slurry is then spray-dried to obtain dried pigment powder.
[0039] A3. After the dried powder is protected in an inert gas atmosphere, it is calcined at 1100℃ for 4 hours, then crushed and passed through a 500-mesh sieve to obtain a high-temperature red pigment.
[0040] Basic glaze preparation:
[0041] B1. Weigh the potassium feldspar according to the formula;
[0042] B2. Add deionized water and dispersant and ball mill until the glaze slurry can usually pass through a 325 mesh sieve.
[0043] Slurry integration:
[0044] C1. Add the prepared high-temperature red pigment to the base glaze slurry.
[0045] C2. Add montmorillonite (plasticizer), sodium tripolyphosphate (dispersant), and sodium hexafluoroaluminate (mineralizer) in the specified proportions and mix thoroughly.
[0046] The firing process in this embodiment includes the following steps:
[0047] D1. First, slowly raise the temperature to 1130℃ in an oxidizing atmosphere and calcine at the bisque firing temperature for 3 hours to fully remove organic matter and moisture from the body and glaze.
[0048] D2. Heat to 1300℃ in an oxidizing atmosphere, calcine at high temperature for 6 hours, and then allow to cool naturally to room temperature after firing.
[0049] The sintering effect is shown in the attached figure. Figure 1 As shown.
[0050] Example 2
[0051] This embodiment proposes a high-temperature underglaze Chinese red glaze. The raw materials, calculated by mass percentage, include high-temperature red pigment, which contains 23 parts of strontium oxide as the base material and 12 parts of chicken-blood stone as the colorant; 60 parts of wollastonite as the glaze matrix; and 5 parts of additives, which contain 2 parts of nano-calcium carbonate as the plasticizer, 1 part of β-cyclodextrin as the dispersant, and 2 parts of sodium fluoride as the mineralizer.
[0052] The high-temperature underglaze Chinese red glaze of this embodiment is prepared by the following steps:
[0053] Preparation of high-temperature red pigment:
[0054] A1. Add strontium oxide and bloodstone to grinding aid and deionized water, and use a ball mill for high-energy ball milling until the particle size reaches the nanoscale.
[0055] A2. The mixture of strontium oxide and bloodstone obtained in step A1 is uniformly dispersed using a high-speed mixer. The mixture slurry is then spray-dried to obtain dried pigment powder.
[0056] A3. After drying, the powder is protected in an inert gas atmosphere and calcined at 1200℃ for 10 hours. After being crushed and passed through a 1000-mesh sieve, a high-temperature red pigment is obtained.
[0057] Basic glaze preparation:
[0058] B1. Weigh the wollastonite according to the formula;
[0059] B2. Add deionized water and dispersant and ball mill until the glaze slurry can usually pass through a 500-mesh sieve.
[0060] Slurry integration:
[0061] C1. Add the prepared high-temperature red pigment to the base glaze slurry.
[0062] C2. Add the plasticizer nano-calcium carbonate, the dispersant β-cyclodextrin, and the mineralizer sodium fluoride in proportion and mix thoroughly.
[0063] The firing process in this embodiment includes the following steps:
[0064] D1. First, slowly raise the temperature to 1150℃ in an oxidizing atmosphere and calcine at the bisque firing temperature for 4 hours to fully remove organic matter and moisture from the body and glaze.
[0065] D2. Heat to 1400℃ in a weak reducing atmosphere, calcine at high temperature for 10 hours, and then cool naturally to room temperature after calcination.
[0066] The sintering effect is shown in the attached figure. Figure 2 As shown.
[0067] Example 3
[0068] This embodiment proposes a high-temperature underglaze Chinese red glaze. The raw materials, calculated by mass percentage, include high-temperature red pigment, which contains 5 parts of yttrium oxide and 15 parts of strontium oxide as base materials, 5 parts of chromium trioxide and 5 parts of chicken blood stone as colorants; 60 parts of muscovite as glaze matrix; and 10 parts of additives, which contain 4 parts of sodium silicate as plasticizer, 3 parts of sodium tripolyphosphate as dispersant, and 3 parts of sodium hexafluoroaluminate as mineralizer.
[0069] The high-temperature underglaze Chinese red glaze of this embodiment is prepared by the following steps:
[0070] Preparation of high-temperature red pigment:
[0071] A1. Add yttrium oxide, strontium oxide, chromium trioxide and bloodstone to the grinding aid and deionized water, and use a ball mill for high-energy ball milling until the particle size reaches the nanoscale.
[0072] A2. The mixture of yttrium oxide, strontium oxide, chromium trioxide and bloodstone obtained in step A1 is uniformly dispersed using a high-speed mixer. The mixture slurry is then spray-dried to obtain dried pigment powder.
[0073] A3. After the dried powder is protected in an inert gas atmosphere, it is calcined at 1150℃ for 8 hours, then crushed and passed through an 800-mesh sieve to obtain a high-temperature red pigment.
[0074] Basic glaze preparation:
[0075] B1. Weigh the muscovite according to the formula;
[0076] B2. Add deionized water and dispersant and ball mill until the glaze slurry can usually pass through a 400-mesh sieve.
[0077] Slurry integration:
[0078] C1. Add the prepared high-temperature red pigment to the base glaze slurry.
[0079] C2. Add sodium silicate plasticizer, sodium tripolyphosphate dispersant, and sodium hexafluoroaluminate mineralizer in proportion and stir thoroughly until evenly mixed.
[0080] The firing process in this embodiment includes the following steps:
[0081] D1. First, slowly raise the temperature to 1140℃ in an oxidizing atmosphere and calcine at the bisque firing temperature for 3 hours to fully remove organic matter and moisture from the body and glaze.
[0082] D2. Heat to 1350℃ in an oxidizing atmosphere, calcine at high temperature for 8 hours, and then allow to cool naturally to room temperature after calcination.
[0083] The sintering effect is shown in the attached figure. Figure 3 As shown.
[0084] Comparative Example 1
[0085] This comparative example proposes a high-temperature underglaze red glaze. The raw materials, calculated by mass percentage, include red pigment, which contains 15 parts of yttrium oxide as the base material and 5 parts of chromium trioxide as the colorant; and 75 parts of muscovite as the glaze matrix.
[0086] The high-temperature underglaze red glaze of this comparative example was prepared by the following steps:
[0087] Preparation of red pigment:
[0088] A1. Add yttrium oxide and chromium trioxide to the grinding aid and deionized water, and use a ball mill for high-energy ball milling until the particle size reaches the nanoscale.
[0089] A2. The mixture of yttrium oxide and chromium trioxide obtained in step A1 is uniformly dispersed using a high-speed mixer. The mixture slurry is then spray-dried to obtain dried pigment powder.
[0090] A3. After the dried powder is protected in an air atmosphere, it is calcined at 1150℃ for 6 hours, then crushed and passed through a 600-mesh sieve to obtain a red pigment.
[0091] Basic glaze preparation:
[0092] B1. Weigh the muscovite according to the formula;
[0093] B2. Add deionized water and dispersant and ball mill until the glaze slurry can usually pass through a 600-mesh sieve.
[0094] Slurry integration:
[0095] C1. Add the prepared red pigment to the base glaze and stir thoroughly until evenly mixed.
[0096] This comparative firing process includes the following steps:
[0097] D1. First, slowly raise the temperature to 1140℃ in an air atmosphere and calcine at the bisque firing temperature for 3 hours to fully remove organic matter and moisture from the body and glaze.
[0098] D2. Heat to 1300℃ in air atmosphere, calcine at high temperature for 6 hours, and then cool naturally to room temperature after firing.
[0099] The sintering effect is shown in the attached figure. Figure 4 As shown.
[0100] Comparative Example 2
[0101] This comparative example proposes a high-temperature underglaze red glaze. The raw materials, calculated by mass percentage, include 15 parts of chromium trioxide as a colorant; 75 parts of quartz sand as a glaze matrix; and 10 parts of additives, including 4 parts of sodium silicate as a plasticizer, 3 parts of sodium tripolyphosphate as a dispersant, and 3 parts of sodium hexafluoroaluminate as a mineralizer.
[0102] The high-temperature underglaze red glaze of this comparative example was prepared by the following steps:
[0103] Preparation of red pigment:
[0104] A1. Add chromium trioxide to the grinding aid and deionized water, and use a ball mill for high-energy ball milling until the particle size reaches the submicron level.
[0105] A2. The chromium trioxide mixture obtained in step A1 is uniformly dispersed using a high-speed mixer, and then the mixture slurry is spray-dried to obtain dried pigment powder.
[0106] A3. After the dried powder is protected in an air atmosphere, it is calcined at 1150℃ for 10 hours, then crushed and passed through a 1000-mesh sieve to obtain a red pigment.
[0107] Basic glaze preparation:
[0108] B1. Weigh the quartz sand according to the formula;
[0109] B2. Add deionized water and dispersant and ball mill until the glaze slurry can usually pass through a 600-mesh sieve.
[0110] Slurry integration:
[0111] C1. Add the prepared red pigment to the base glaze and stir thoroughly until evenly mixed.
[0112] C2. Add sodium silicate plasticizer, sodium tripolyphosphate dispersant, and sodium hexafluoroaluminate mineralizer in proportion and stir thoroughly until evenly mixed.
[0113] This comparative firing process includes the following steps:
[0114] D1. First, slowly raise the temperature to 1150℃ in an air atmosphere and calcine at the bisque firing temperature for 4 hours to fully remove organic matter and moisture from the body and glaze.
[0115] D2. Heat to 1400℃ in air atmosphere, calcine at high temperature for 10 hours, and then cool naturally to room temperature after firing.
[0116] The sintering effect is shown in the attached figure. Figure 5 As shown.
[0117] Comparative Example 3
[0118] This comparative example proposes a high-temperature underglaze red glaze. The raw materials, calculated by mass percentage, include red pigment, which contains 15 parts of yttrium oxide as the base material and 5 parts of chromium trioxide as the colorant; and 10 parts of additives, which contain 4 parts of sodium silicate as the plasticizer, 3 parts of sodium tripolyphosphate as the dispersant, and 3 parts of sodium hexafluoroaluminate as the mineralizer.
[0119] The high-temperature underglaze red glaze of this comparative example was prepared by the following steps:
[0120] Preparation of red pigment:
[0121] A1. Add yttrium oxide and chromium trioxide to the grinding aid and deionized water, and use a ball mill for high-energy ball milling until the particle size reaches the submicron level;
[0122] A2. The mixture of yttrium oxide and chromium trioxide obtained in step A1 is uniformly dispersed using a high-speed mixer. The mixture slurry is then spray-dried to obtain dried pigment powder.
[0123] A3. After the dried powder is protected in an air atmosphere, it is calcined at 1150℃ for 10 hours, then crushed and passed through a 1000-mesh sieve to obtain a red pigment.
[0124] Slurry integration:
[0125] C1. Add sodium silicate plasticizer, sodium tripolyphosphate dispersant, and sodium hexafluoroaluminate mineralizer to the prepared red pigment in proportion and stir thoroughly until evenly mixed.
[0126] This comparative firing process includes the following steps:
[0127] D1. First, slowly raise the temperature to 1150℃ in an air atmosphere and calcine at the bisque firing temperature for 4 hours to fully remove organic matter and moisture from the body and glaze.
[0128] D2. Heat to 1400℃ in air atmosphere, calcine at high temperature for 10 hours, and then cool naturally to room temperature after firing.
[0129] The sintering effect is shown in the attached figure. Figure 6 As shown.
[0130] As can be seen from the firing results of the examples and comparative examples, the high-temperature underglaze Chinese red glaze in Examples 1-3 of the present invention has a bright and beautiful glaze color, full color, and correct color, without darkening or blackening. It has extremely high artistic value and practicality, and good application prospects.
[0131] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A high-temperature underglaze Chinese red glaze, characterized in that, It includes high-temperature red pigment, glaze matrix and related additives; characterized in that the raw materials of the Chinese red glaze, calculated by mass percentage, include 15-35 parts of high-temperature red pigment; 60-80 parts of glaze matrix; and 5-10 parts of related additives.
2. The high-temperature underglaze Chinese red glaze according to claim 1, characterized in that, The high-temperature red pigment comprises a base material and a colorant, and by mass percentage, it comprises 5-23 parts of base material and 10-12 parts of colorant; wherein the base material is one or more of yttrium oxide, zirconium oxide, cerium oxide, neodymium oxide, and strontium oxide; and the colorant is one or more of chromium trioxide, bloodstone, and iron oxide.
3. The high-temperature underglaze Chinese red glaze according to claim 1, characterized in that, The glaze matrix is one or more of potassium feldspar, muscovite, quartz sand, boric acid and wollastonite.
4. The high-temperature underglaze Chinese red glaze according to claim 1, characterized in that, The relevant additives include plasticizers, dispersants, and mineralizers, and by mass percentage, include 2-4 parts of plasticizer, 1-3 parts of dispersant, and 2-3 parts of mineralizer; characterized in that the plasticizer is one or more of montmorillonite, sodium silicate, nano-calcium carbonate, and vapor-deposited nano-silica; the dispersant is one or more of sodium tripolyphosphate and β-cyclodextrin; and the mineralizer is one or more of sodium hexafluoroaluminate and sodium fluoride.
5. The method for preparing high-temperature underglaze Chinese red glaze according to claims 1-4, characterized in that, Includes the following steps: Preparation of high-temperature red pigment: A1. Add the base material and colorant to the grinding aid and deionized water, and use a ball mill for high-energy ball milling until the particle size reaches the nano or submicron level. A2. The mixture of base material and colorant obtained in step A1 is uniformly dispersed using a high-speed mixer. Then, the mixture slurry is spray-dried to obtain dried colorant powder. A3. After drying, the powder is protected in an inert gas atmosphere and calcined at 1100~1200℃ for 4~10 hours. After being crushed and passed through a 500~1000 mesh sieve, a high-temperature red pigment is obtained. Basic glaze preparation: B1. Weigh and mix the components of the glaze matrix. B2. Add deionized water and dispersant and ball mill until the glaze slurry can usually pass through a 325~500 mesh sieve. Slurry integration: C1. Add the prepared high-temperature red pigment to the base glaze slurry. C2. After adding the plasticizer and mineralizer in proportion, all components are thoroughly stirred and mixed evenly to obtain the high-temperature underglaze Chinese red glaze.
6. The firing of the high-temperature underglaze Chinese red glaze according to claims 1-5 includes the following process: D1. First, slowly raise the temperature to 1130~1150℃ in an oxidizing atmosphere and calcine at the bisque firing temperature for 3~4 hours to fully remove organic matter and moisture from the body and glaze. D2. Heat to 1300~1400℃ in an oxidizing or weakly reducing atmosphere, calcine at high temperature for 6~10 hours, and then cool naturally to room temperature after calcination.
7. The high-temperature underglaze Chinese red glaze according to any one of claims 1-4 or the high-temperature underglaze Chinese red glaze prepared and sintered by the preparation method according to any one of claims 5-6, is used in high-temperature underglaze applications.