A process for firing Jun porcelain with tortoise shell glaze

Abstract

The present invention relates to the field of Jun porcelain firing, specifically a process for firing Jun porcelain with tortoise-shell glaze. First, a plain base is immersed in a slurry of ground glaze for 4-6 seconds to apply the glaze. After the ground glaze slurry adhered to the surface of the base is dried, a slurry of spotted glaze is locally applied to the ground glaze. After drying, the base is placed in a kiln for firing to obtain the tortoise-shell glazed Jun porcelain. The process proposed in this invention utilizes a specific glaze ratio and firing process. After high-temperature firing, the tortoise-shell glaze pattern exhibits stability and high saturation, significantly enhances glaze surface brightness, improves color development rate, and enhances glaze fluidity.

Description

Technical Field

[0001] The invention relates to the field of Jun porcelain firing, and in particular to a process for firing Jun porcelain with tortoise shell glaze. Background Art

[0002] Jun porcelain is renowned for its rich and diverse colors. During the high-temperature firing process, the glaze develops a natural kiln-changed effect, creating a mottled pattern and layered colors that imbue the piece with a unique sense of three-dimensionality and depth. Jun porcelain comes in a wide range of colors, including sky blue, lake green, azurite, and fiery red. These rich and varied hues offer a visual experience of beauty and impact. This chromatic presentation is not simply a superposition of colors, but rather a blending and complementing of each other, creating a vibrant and rich effect, some resembling clouds and mist, others like ripples on water.

[0003] Tortoiseshell glaze is a special type of Jun porcelain glaze, exhibiting a unique texture that resembles the pattern of a tortoise shell, with irregular and rich texture. Traditional tortoiseshell glaze, which uses iron as a dark brown coloring element, suffers from poor color stability, low color saturation, and a lack of brightness. Furthermore, the glaze's fluidity is difficult to control, creating challenges during its firing process.

[0004] To this end, the present invention proposes a process for firing Jun porcelain with tortoise shell glaze to solve the above-mentioned problems such as unstable tortoise shell glaze patterns, low color saturation, insufficient glaze brightness, low color development rate, and difficult to control glaze fluidity. Summary of the Invention

[0005] The purpose of the present invention is to propose a process for firing Jun porcelain with tortoise shell glaze to solve the above-mentioned problems such as unstable tortoise shell glaze pattern, low color saturation, insufficient glaze brightness, low color development rate, and difficult to control glaze fluidity.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A process for firing Jun porcelain with tortoise shell glaze, which involves dipping the base glaze slurry into the base glaze for 4-6 seconds. After the base glaze slurry adhered to the base glaze surface is dried, the base glaze slurry is then partially applied to the base glaze. After drying, the base glaze is fired in a kiln to obtain tortoise shell glaze Jun porcelain.

[0008] The base glaze comprises the following raw materials in parts by weight: 23-28 parts of feldspar, 10-15 parts of calcite, 13-18 parts of quartz, 28-33 parts of black medicinal stone, 8-13 parts of iron ore, 5-10 parts of titanium ore, and 3-5 parts of black stone; the black medicinal stone is obtained from Yezhugou, Huangdao Township, Jia County, Pingdingshan City, Henan Province, and its main components are SiO2, Al2O3 and CaO; the main components of the black stone are SiO2, Al2O3, Fe2O3, and CaO;

[0009] The spotted glaze comprises the following raw materials in parts by weight: 48-53 parts of white feldspar, 8-13 parts of quartz, 10-15 parts of calcite, 9-14 parts of this medicine, 1-5 parts of chlorite, 2-6 parts of zinc oxide, 1.5-3.5 parts of ilmenite, 0.5-2.5 parts of bone powder, 3-7 parts of copper ore, 1-5 parts of talc, 1-3 parts of ruthenium, 1-3 parts of amethyst, and 1-2 parts of cerium dioxide; the bone powder is calcined cattle bone powder, the chlorite is Yuzhou chlorite; the this medicine is Jiushan chlorite, a natural ore for glaze, produced in Li Village, Jiushan Township, Yuzhou;

[0010] The temperature changes in the kiln during the firing process are divided into the following stages:

[0011] S1: The temperature in the furnace increases from 20°C to 100°C within 30 minutes;

[0012] S2: The temperature in the furnace is increased from 100°C to 300°C within 30 minutes;

[0013] S3: The temperature in the furnace is increased from 300°C to 500°C within 30 minutes;

[0014] S4: The furnace temperature is increased from 500°C to 750°C within 30 minutes;

[0015] S5: The furnace temperature is increased from 750°C to 1050°C within 120 min;

[0016] S6: The furnace temperature is increased from 1050°C to 1200°C within 90 min;

[0017] S7: The furnace temperature is increased from 1200°C to 1260°C within 100 min;

[0018] S8: The temperature in the furnace is reduced from 1260°C to 1170°C within 20 minutes;

[0019] S9: After the kiln temperature is kept at 1170℃ for 90 minutes, the kiln is turned off and cooled naturally until the temperature inside the kiln drops to room temperature. The kiln is opened to obtain tortoiseshell glaze Jun porcelain;

[0020] Among them, the S1-S4 stage is the oxidizing atmosphere control stage. The gate plate in the kiln is not completely closed, and there is sufficient oxygen burning in the furnace. When it reaches the 750℃ stage, the gate plate is closed, and the combustion atmosphere in the furnace begins to turn to fire, the flame supply is increased, and the fan suction is reduced to form a heavy reducing atmosphere. At 1050℃, the gate plate gap is opened, the flame supply is reduced, and the atmosphere is controlled to be a moderate reducing atmosphere. The color begins to appear. At 1260℃, the color of the Jun porcelain glaze is stable, and then the temperature is reduced to 1170℃. The temperature in the kiln is kept warm for 90 minutes for color fixation.

[0021] Preferably, the body of the plain body is a fragrant ash body, which contains the following raw materials in parts by weight: 52 parts of kaolin, 11 parts of clay, 14 parts of quartz sand, 5 parts of wollastonite, and 18 parts of soda stone. The kaolin and clay are both produced in Huangzhen, Jiaxian County.

[0022] Preferably, the preparation process of the biscuit is as follows: mixing the biscuit raw materials and water by weight and grinding them to 260-320 mesh, injection molding the slurry, drying and biscuit firing to obtain the biscuit.

[0023] Preferably, the preparation process of the ground glaze slurry is: the ground glaze raw materials and water are mixed and ground to 370-420 mesh, left to stand for 6-7 hours, and the water content of the slurry is adjusted to 48-53%, thereby obtaining the ground glaze slurry.

[0024] Preferably, the preparation process of the spotted glaze slurry is: the raw materials of the spotted glaze and water are mixed by equal weight and ground to 370-420 mesh, left to stand for 6-7 hours, and the water content of the slurry is adjusted to 48-53%, thereby obtaining the spotted glaze slurry.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The black medicinal stone in the base glaze contains a large amount of silicon, calcium and aluminum. Calcium and aluminum have a granular feel and are difficult to dissolve in water. The glaze surface will appear milky, making the local Jun porcelain feel heavy and rich in connotation.

[0027] 2. The black stone in the base glaze contains a large amount of aluminum and iron, and presents dark red and black tones in an oxidizing atmosphere. This composite base color is closer to the natural color and texture that appears when the tortoise shell grows. Unlike other tortoise shell glaze imitation colors, the glaze formula proposed in this invention is based on the black base glaze, with rich kiln-fired colors and better imitation.

[0028] 3. The base glaze contains iron ore and titanium ore. In traditional porcelain firing, iron acts as a coloring element and appears black-brown under oxidation. However, if the combustion atmosphere is not accurately controlled, the glaze color will be purple and unstable. The present invention adds titanium to cooperate with iron, so that the iron oxidation is more thorough and the black-brown color is stable. The titanium can refine the glaze crystal texture, increase the glaze gloss, improve the glaze layer strength, and make the glaze surface smoother and more delicate. The titanium ore particles can present a unique light yellow color, which is more unified with the tortoise-shell-shaped yellow-white glaze, and the transition is natural, adding an artistic effect to the porcelain.

[0029] 4. The spotted glaze contains this medicine and bone powder. The aluminum element in this medicine and the calcium element in the bone powder together increase the thickness of the glaze, and it is milky white with an opacifying effect. In addition, the bone powder can also increase the stability of the dispersion of the entire glaze color, making the color elements in the glaze more evenly dispersed, and then forming a more delicate and smooth visual effect of the glaze, enhancing the overall jade texture of the porcelain and making the visual effect richer.

[0030] 5. The spotted glaze contains a small amount of zinc oxide and talc, which have a fluxing effect in the glaze, reduce the expansion coefficient of the glaze, improve the fluidity of the spotted glaze, and increase the gloss of the glaze. Compared with the traditional Jun porcelain production process, the stability of the glaze is greatly improved, which is conducive to improving firing efficiency and saving resources.

[0031] 6. Feldspar minerals can lower the melting point of glazes and promote the melting of glazes because their main components are calcium-containing aluminum silicates. Adding feldspar minerals to glazes can improve the fluidity of glazes. Based on this, the weight proportion of white feldspar in the spotted glaze of the present invention is 48-53 parts, and the weight proportion of yellow feldspar in the base glaze is 23-28 parts, resulting in a large difference in fluidity between the two. The base glaze has weaker fluidity and can firmly adhere to the incense ash body, while the spotted glaze has relatively strong fluidity. In the molten state, the spotted glaze will flow to form unique patterns, resembling a tortoise shell, and has high artistic value.

[0032] 7. The spotted glaze contains a small amount of chlorite, which is a natural chlorite native to Yuzhou. It belongs to the kaolinite clay mineral type and contains a large amount of silicon and aluminum elements. It is green in color overall. Chlorite can reduce the firing temperature of Jun porcelain raw materials, promote the melting of other mineral raw materials, make the texture of the body dense, and the appearance translucent, thereby increasing the texture of Jun porcelain.

[0033] 8. The raw materials for spotted glaze contain a small amount of ilmenite and copper ore. The iron oxide and titanium oxide in the ilmenite react with the copper oxide in the copper ore under a reducing atmosphere. The fired glaze shows a certain light yellow-brown color. Compared with the traditional black-yellow color fired with modified ferric oxide as the colorant, it has higher saturation, more layering and artistic effect.

[0034] 9. Cerium dioxide in the spotted glaze has strong redox ability and the ability to store and release oxygen. During the firing process, it can adapt to different combustion atmospheres and accelerate the coloring and fixing of the spotted glaze. Compared with the light yellowish brown patterns fired by traditional formulas, the spotted glaze proposed by the present invention can quickly show color, and because of the trace oxygen elements released by cerium dioxide in a reducing atmosphere, maroon or blue-green spots can appear in the light yellowish brown patterns, which are more similar to the real growth patterns of the tortoise shell.

[0035] 10. Jun porcelain is kept warm and fixed in color when the temperature drops from 1260℃ to 1170℃. Compared with the traditional firing process, keeping the temperature at 1170℃ as the color fixing temperature can prevent the glaze from being too fluid in an excessively high ambient temperature for a long time, which will cause glaze flow, making the tortoise shell pattern area too large and the pattern unclear. After many firing tests, it was verified that when the temperature is kept at 1170℃, the fluidity of the spotted glaze forms a pattern on the surface of the Jun porcelain that is closest to the tortoise shell pattern, and after 90 minutes of color fixing at 1170℃, the surface of the glaze layer is smooth, the color is bright, and the color effect is more vivid.

[0036] In summary, the process of firing Jun porcelain with tortoise shell glaze proposed in the present invention has the advantages of stable tortoise shell glaze pattern and high saturation after high-temperature firing through specific glaze ratio and firing process, significantly enhanced glaze brightness, improved color rendering rate, and more controllable glaze fluidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The glaze color of Jun porcelain after firing is presented in this invention Figure 1 ;

[0038] Figure 2 The glaze color of Jun porcelain after firing is presented in this invention Figure 2 ;

[0039] Figure 3 This is a photo of a hawksbill turtle specimen published on the Internet. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] The present invention provides the following technical solutions:

[0042] Example 1:

[0043] A tortoise shell glaze, comprising a base glaze and a spotted glaze applied to a plain body, wherein the base glaze comprises the following raw materials in parts by weight: 23 parts of orthoclase, 10 parts of calcite, 13 parts of quartz, 28 parts of black medicinal stone, 8 parts of iron ore, 5 parts of titanium ore, and 3 parts of black stone;

[0044] The black medicinal stone is taken from Yezhugou, Huangdao Township, Jia County, Pingdingshan City, Henan Province, and its main components are SiO2, Al2O3 and CaO;

[0045] The main components of the black stone are SiO2, Al2O3, Fe2O3 and CaO.

[0046] Furthermore, the spotted glaze comprises the following raw materials in parts by weight: 48-53 parts of white feldspar, 8-13 parts of quartz, 10 parts of calcite, 9 parts of this medicine, 1 part of chlorite, 2 parts of zinc oxide, 1.5 parts of ilmenite, 0.5 parts of bone powder, 3 parts of copper ore, 1 part of talc, 1 part of ruthenium blue stone, 1 part of purple quartz, and 1 part of cerium dioxide;

[0047] The bone powder is calcined cattle bone powder, and the chlorite is Yuzhou chlorite;

[0048] The medicine mentioned above is Jiushan medicine, which is a natural glaze mineral produced in Li Village, Jiushan Township, Yuzhou.

[0049] A process for firing Jun porcelain with tortoise-shell glaze, wherein the base body is immersed in a base glaze slurry for 4 seconds for glazing. After the base glaze slurry adhered to the base body surface is dried, the base glaze slurry is then partially applied with a mottled glaze slurry. After drying, the base glaze is placed in a kiln for firing to obtain the tortoise-shell glaze Jun porcelain. The characteristics are:

[0050] The temperature changes in the kiln during the firing process are divided into the following stages:

[0051] S1: The temperature in the furnace increases from 20°C to 100°C within 30 minutes;

[0052] S2: The temperature in the furnace is increased from 100°C to 300°C within 30 minutes;

[0053] S3: The temperature in the furnace is increased from 300°C to 500°C within 30 minutes;

[0054] S4: The furnace temperature is increased from 500°C to 750°C within 30 minutes;

[0055] S5: The furnace temperature is increased from 750°C to 1050°C within 120 min;

[0056] S6: The furnace temperature is increased from 1050°C to 1200°C within 90 min;

[0057] S7: The furnace temperature is increased from 1200°C to 1260°C within 100 min;

[0058] S8: The temperature in the furnace is reduced from 1260°C to 1170°C within 20 minutes;

[0059] S9: After the kiln temperature is kept at 1170℃ for 90 minutes, the kiln is turned off and cooled naturally until the temperature inside the kiln drops to room temperature. The kiln is opened to obtain tortoiseshell glaze Jun porcelain;

[0060] Among them, the S1-S4 stage is the oxidizing atmosphere control stage. The gate plate in the kiln is not completely closed, and there is sufficient oxygen burning in the furnace. When it reaches the 750℃ stage, the gate plate is closed, and the combustion atmosphere in the furnace begins to turn to fire, the flame supply is increased, and the fan suction is reduced to form a heavy reducing atmosphere. At 1050℃, the gate plate gap is opened, the flame supply is reduced, and the atmosphere is controlled to be a moderate reducing atmosphere. The color begins to appear. At 1260℃, the color of the Jun porcelain glaze is stable, and then the temperature is reduced to 1170℃. The temperature in the kiln is kept warm for 90 minutes for color fixation.

[0061] Furthermore, the body of the plain body is a fragrant ash body, which contains the following raw materials in parts by weight: 52 parts of kaolin, 11 parts of clay, 14 parts of quartz sand, 5 parts of wollastonite, and 18 parts of soda stone. The kaolin and clay are both produced in Huangzhen, Jia County.

[0062] Furthermore, the preparation process of the biscuit is as follows: mixing the biscuit raw materials and water by weight and grinding them to 260 mesh, injection molding the slurry, drying and biscuit firing to obtain the biscuit.

[0063] Furthermore, the preparation process of the ground glaze slurry is as follows: the raw materials of the ground glaze and water are mixed and ground to 370 mesh, and the mixture is allowed to stand for 6 hours, and the water content of the slurry is adjusted to 48%, thereby obtaining the ground glaze slurry.

[0064] Furthermore, the preparation process of the spotted glaze slurry is as follows: the raw materials of the spotted glaze and water are mixed by equal weight and ground to 370 mesh, left to stand for 6 hours, and the water content of the slurry is adjusted to 48%, thereby obtaining the spotted glaze slurry.

[0065] Example 2:

[0066] A tortoise shell glaze, comprising a base glaze and a spotted glaze applied to a plain body, wherein the base glaze comprises the following raw materials in parts by weight: 24 parts of orthoclase, 11 parts of calcite, 14 parts of quartz, 29 parts of black medicinal stone, 9 parts of iron ore, 6 parts of titanium ore, and 3.5 parts of black stone;

[0067] The black medicinal stone is taken from Yezhugou, Huangdao Township, Jia County, Pingdingshan City, Henan Province, and its main components are SiO2, Al2O3 and CaO;

[0068] The main components of the black stone are SiO2, Al2O3, Fe2O3 and CaO.

[0069] Furthermore, the spotted glaze comprises the following raw materials in parts by weight: 49 parts of white feldspar, 9 parts of quartz, 11 parts of calcite, 10 parts of this medicine, 2 parts of chlorite, 3 parts of zinc oxide, 2 parts of ilmenite, 1 part of bone meal, 4 parts of copper ore, 2 parts of talc, 1.5 parts of rutile, 1.5 parts of violet stone, and 1.2 parts of cerium dioxide;

[0070] The bone powder is calcined cattle bone powder, and the chlorite is Yuzhou chlorite;

[0071] The medicine mentioned above is Jiushan medicine, which is a natural glaze mineral produced in Li Village, Jiushan Township, Yuzhou.

[0072] A process for firing Jun porcelain with tortoise-shell glaze, wherein the base body is immersed in a base glaze slurry for 5 seconds for glazing. After the base glaze slurry adhered to the base body surface is dried, the base glaze slurry is then partially applied with a mottled glaze slurry. After drying, the base glaze is placed in a kiln for firing to obtain the tortoise-shell glaze Jun porcelain. The characteristics are:

[0073] The temperature changes in the kiln during the firing process are divided into the following stages:

[0074] S1: The temperature in the furnace increases from 20°C to 100°C within 30 minutes;

[0075] S2: The temperature in the furnace is increased from 100°C to 300°C within 30 minutes;

[0076] S3: The temperature in the furnace is increased from 300°C to 500°C within 30 minutes;

[0077] S4: The furnace temperature is increased from 500°C to 750°C within 30 minutes;

[0078] S5: The furnace temperature is increased from 750°C to 1050°C within 120 min;

[0079] S6: The furnace temperature is increased from 1050°C to 1200°C within 90 min;

[0080] S7: The furnace temperature is increased from 1200°C to 1260°C within 100 min;

[0081] S8: The temperature in the furnace is reduced from 1260°C to 1170°C within 20 minutes;

[0082] S9: After the kiln temperature is kept at 1170℃ for 90 minutes, the kiln is turned off and cooled naturally until the temperature inside the kiln drops to room temperature. The kiln is opened to obtain tortoiseshell glaze Jun porcelain;

[0083] Among them, the S1-S4 stage is the oxidizing atmosphere control stage. The gate plate in the kiln is not completely closed, and there is sufficient oxygen burning in the furnace. When it reaches the 750℃ stage, the gate plate is closed, and the combustion atmosphere in the furnace begins to turn to fire, the flame supply is increased, and the fan suction is reduced to form a heavy reducing atmosphere. At 1050℃, the gate plate gap is opened, the flame supply is reduced, and the atmosphere is controlled to be a moderate reducing atmosphere. The color begins to appear. At 1260℃, the color of the Jun porcelain glaze is stable, and then the temperature is reduced to 1170℃. The temperature in the kiln is kept warm for 90 minutes for color fixation.

[0084] Furthermore, the body of the plain body is a fragrant ash body, which contains the following raw materials in parts by weight: 52 parts of kaolin, 11 parts of clay, 14 parts of quartz sand, 5 parts of wollastonite, and 18 parts of soda stone. The kaolin and clay are both produced in Huangzhen, Jia County.

[0085] Furthermore, the preparation process of the biscuit is as follows: mixing the biscuit raw materials and water by weight and grinding them to 270 mesh, injection molding the slurry, drying and biscuit firing to obtain the biscuit.

[0086] Furthermore, the preparation process of the ground glaze slurry is as follows: the raw materials of the ground glaze and water are mixed by weight and ground to 380 mesh, left to stand for 6.5 hours, and the water content of the slurry is adjusted to 49%, thereby obtaining the ground glaze slurry.

[0087] Furthermore, the preparation process of the spotted glaze slurry is as follows: the raw materials of the spotted glaze and water are mixed by equal weight and ground to 380 mesh, left to stand for 6.5 hours, and the water content of the slurry is adjusted to 49%, thereby obtaining the spotted glaze slurry.

[0088] Example 3:

[0089] A tortoise shell glaze, comprising a base glaze and a spotted glaze applied to a plain body, wherein the base glaze comprises the following raw materials in parts by weight: 25 parts of orthoclase, 12 parts of calcite, 15 parts of quartz, 30 parts of black medicinal stone, 10 parts of iron ore, 7 parts of titanium ore, and 4 parts of black stone;

[0090] The black medicinal stone is taken from Yezhugou, Huangdao Township, Jia County, Pingdingshan City, Henan Province, and its main components are SiO2, Al2O3 and CaO;

[0091] The main components of the black stone are SiO2, Al2O3, Fe2O3 and CaO.

[0092] Furthermore, the spotted glaze comprises the following raw materials in parts by weight: 50 parts of white feldspar, 10 parts of quartz, 12 parts of calcite, 11 parts of this medicine, 3 parts of chlorite, 4 parts of zinc oxide, 2.5 parts of ilmenite, 1.5 parts of bone meal, 5 parts of copper ore, 3 parts of talc, 2 parts of rutile, 2 parts of violet stone, and 1.4 parts of cerium dioxide;

[0093] The bone powder is calcined cattle bone powder, and the chlorite is Yuzhou chlorite;

[0094] The medicine mentioned above is Jiushan medicine, which is a natural glaze mineral produced in Li Village, Jiushan Township, Yuzhou.

[0095] A process for firing Jun porcelain with tortoise-shell glaze, wherein the base body is immersed in a base glaze slurry for 4 seconds for glazing. After the base glaze slurry adhered to the base body surface is dried, the base glaze slurry is then partially applied with a mottled glaze slurry. After drying, the base glaze is placed in a kiln for firing to obtain the tortoise-shell glaze Jun porcelain. The characteristics are:

[0096] The temperature changes in the kiln during the firing process are divided into the following stages:

[0097] S1: The temperature in the furnace increases from 20°C to 100°C within 30 minutes;

[0098] S2: The temperature in the furnace is increased from 100°C to 300°C within 30 minutes;

[0099] S3: The temperature in the furnace is increased from 300°C to 500°C within 30 minutes;

[0100] S4: The furnace temperature is increased from 500°C to 750°C within 30 minutes;

[0101] S5: The furnace temperature is increased from 750°C to 1050°C within 120 min;

[0102] S6: The furnace temperature is increased from 1050°C to 1200°C within 90 min;

[0103] S7: The furnace temperature is increased from 1200°C to 1260°C within 100 min;

[0104] S8: The temperature in the furnace is reduced from 1260°C to 1170°C within 20 minutes;

[0105] S9: After the kiln temperature is kept at 1170℃ for 90 minutes, the kiln is turned off and cooled naturally until the temperature inside the kiln drops to room temperature. The kiln is opened to obtain tortoiseshell glaze Jun porcelain;

[0106] Among them, the S1-S4 stage is the oxidizing atmosphere control stage. The gate plate in the kiln is not completely closed, and there is sufficient oxygen burning in the furnace. When it reaches the 750℃ stage, the gate plate is closed, and the combustion atmosphere in the furnace begins to turn to fire, the flame supply is increased, and the fan suction is reduced to form a heavy reducing atmosphere. At 1050℃, the gate plate gap is opened, the flame supply is reduced, and the atmosphere is controlled to be a moderate reducing atmosphere. The color begins to appear. At 1260℃, the color of the Jun porcelain glaze is stable, and then the temperature is reduced to 1170℃. The temperature in the kiln is kept warm for 90 minutes for color fixation.

[0107] Furthermore, the body of the plain body is a fragrant ash body, which contains the following raw materials in parts by weight: 52 parts of kaolin, 11 parts of clay, 14 parts of quartz sand, 5 parts of wollastonite, and 18 parts of soda stone. The kaolin and clay are both produced in Huangzhen, Jia County.

[0108] Furthermore, the preparation process of the biscuit is as follows: mixing the biscuit raw materials and water by weight and grinding them to 280 mesh, injection molding the slurry, drying and biscuit firing to obtain the biscuit.

[0109] Furthermore, the preparation process of the ground glaze slurry is as follows: the raw materials of the ground glaze and water are mixed by weight and ground to 390 mesh, left to stand for 6.5 hours, and the water content of the slurry is adjusted to 50%, thereby obtaining the ground glaze slurry.

[0110] Furthermore, the preparation process of the spotted glaze slurry is as follows: the raw materials of the spotted glaze and water are mixed by equal weight and ground to 390 mesh, left to stand for 6.5 hours, and the water content of the slurry is adjusted to 50%, thereby obtaining the spotted glaze material.

[0111] Example 4:

[0112] A tortoise shell glaze, comprising a base glaze and a spotted glaze applied to a plain body, wherein the base glaze comprises the following raw materials in parts by weight: 27 parts of orthoclase, 14 parts of calcite, 17 parts of quartz, 32 parts of black medicinal stone, 12 parts of iron ore, 9 parts of titanium ore, and 4 parts of black stone;

[0113] The black medicinal stone is taken from Yezhugou, Huangdao Township, Jia County, Pingdingshan City, Henan Province, and its main components are SiO2, Al2O3 and CaO;

[0114] The main components of the black stone are SiO2, Al2O3, Fe2O3 and CaO.

[0115] Furthermore, the spotted glaze comprises the following raw materials in parts by weight: 52 parts of white feldspar, 12 parts of quartz, 14 parts of calcite, 13 parts of this medicine, 4 parts of chlorite, 5 parts of zinc oxide, 3 parts of ilmenite, 2 parts of bone meal, 6 parts of copper ore, 4 parts of talc, 2.5 parts of rutile, 2.5 parts of violet stone, and 1.8 parts of cerium dioxide;

[0116] The bone powder is calcined cattle bone powder, and the chlorite is Yuzhou chlorite;

[0117] The medicine mentioned above is Jiushan medicine, which is a natural glaze mineral produced in Li Village, Jiushan Township, Yuzhou.

[0118] A process for firing Jun porcelain with tortoise-shell glaze, wherein the base body is immersed in a base glaze slurry for 6 seconds for glazing. After the base glaze slurry adhered to the base body surface is dried, the base glaze slurry is then partially applied with a mottled glaze slurry. After drying, the base glaze is placed in a kiln for firing to obtain the tortoise-shell glaze Jun porcelain. The process is characterized by:

[0119] The temperature changes in the kiln during the firing process are divided into the following stages:

[0120] S1: The temperature in the furnace increases from 20°C to 100°C within 30 minutes;

[0121] S2: The temperature in the furnace is increased from 100°C to 300°C within 30 minutes;

[0122] S3: The temperature in the furnace is increased from 300°C to 500°C within 30 minutes;

[0123] S4: The furnace temperature is increased from 500°C to 750°C within 30 minutes;

[0124] S5: The furnace temperature is increased from 750°C to 1050°C within 120 min;

[0125] S6: The furnace temperature is increased from 1050°C to 1200°C within 90 min;

[0126] S7: The furnace temperature is increased from 1200°C to 1260°C within 100 min;

[0127] S8: The temperature in the furnace is reduced from 1260°C to 1170°C within 20 minutes;

[0128] S9: After the kiln temperature is kept at 1170℃ for 90 minutes, the kiln is turned off and cooled naturally until the temperature inside the kiln drops to room temperature. The kiln is opened to obtain tortoiseshell glaze Jun porcelain;

[0129] Among them, the S1-S4 stage is the oxidizing atmosphere control stage. The gate plate in the kiln is not completely closed, and there is sufficient oxygen burning in the furnace. When it reaches the 750℃ stage, the gate plate is closed, and the combustion atmosphere in the furnace begins to turn to fire, the flame supply is increased, and the fan suction is reduced to form a heavy reducing atmosphere. At 1050℃, the gate plate gap is opened, the flame supply is reduced, and the atmosphere is controlled to be a moderate reducing atmosphere. The color begins to appear. At 1260℃, the color of the Jun porcelain glaze is stable, and then the temperature is reduced to 1170℃. The temperature in the kiln is kept warm for 90 minutes for color fixation.

[0130] Furthermore, the body of the plain body is a fragrant ash body, which contains the following raw materials in parts by weight: 52 parts of kaolin, 11 parts of clay, 14 parts of quartz sand, 5 parts of wollastonite, and 18 parts of soda stone. The kaolin and clay are both produced in Huangzhen, Jia County.

[0131] Furthermore, the preparation process of the biscuit is as follows: mixing the biscuit raw materials and water by weight and grinding them to 310 mesh, injection molding the slurry, drying and biscuit firing to obtain the biscuit.

[0132] Furthermore, the preparation process of the ground glaze slurry is as follows: the raw materials of the ground glaze and water are mixed by equal weight and ground to 410 mesh, left to stand for 6.8 hours, and the water content of the slurry is adjusted to 52%, thereby obtaining the ground glaze slurry.

[0133] Furthermore, the preparation process of the spotted glaze slurry is as follows: the raw materials of the spotted glaze and water are mixed by equal weight and ground to 410 mesh, left to stand for 6.8 hours, and the water content of the slurry is adjusted to 52%, thereby obtaining the spotted glaze slurry.

[0134] Example 5:

[0135] A tortoise shell glaze, comprising a base glaze and a spotted glaze applied to a plain body, wherein the base glaze comprises the following raw materials in parts by weight: 28 parts of orthoclase, 15 parts of calcite, 18 parts of quartz, 33 parts of black medicinal stone, 13 parts of iron ore, 10 parts of titanium ore, and 5 parts of black stone;

[0136] The black medicinal stone is taken from Yezhugou, Huangdao Township, Jia County, Pingdingshan City, Henan Province, and its main components are SiO2, Al2O3 and CaO;

[0137] The main components of the black stone are SiO2, Al2O3, Fe2O3 and CaO.

[0138] Furthermore, the spotted glaze comprises the following raw materials in parts by weight: 53 parts of white feldspar, 13 parts of quartz, 15 parts of calcite, 14 parts of this medicine, 5 parts of chlorite, 6 parts of zinc oxide, 3.5 parts of ilmenite, 2.5 parts of bone meal, 7 parts of copper ore, 5 parts of talc, 3 parts of rutile, 3 parts of violet stone, and 2 parts of cerium dioxide;

[0139] The bone powder is calcined cattle bone powder, and the chlorite is Yuzhou chlorite;

[0140] The medicine mentioned above is Jiushan medicine, which is a natural glaze mineral produced in Li Village, Jiushan Township, Yuzhou.

[0141] A process for firing Jun porcelain with tortoise-shell glaze, wherein the base body is immersed in a base glaze slurry for 6 seconds for glazing. After the base glaze slurry adhered to the base body surface is dried, the base glaze slurry is then partially applied with a mottled glaze slurry. After drying, the base glaze is placed in a kiln for firing to obtain the tortoise-shell glaze Jun porcelain. The process is characterized by:

[0142] The temperature changes in the kiln during the firing process are divided into the following stages:

[0143] S1: The temperature in the furnace increases from 20°C to 100°C within 30 minutes;

[0144] S2: The temperature in the furnace is increased from 100°C to 300°C within 30 minutes;

[0145] S3: The temperature in the furnace is increased from 300°C to 500°C within 30 minutes;

[0146] S4: The furnace temperature is increased from 500°C to 750°C within 30 minutes;

[0147] S5: The furnace temperature is increased from 750°C to 1050°C within 120 min;

[0148] S6: The furnace temperature is increased from 1050°C to 1200°C within 90 min;

[0149] S7: The furnace temperature is increased from 1200°C to 1260°C within 100 min;

[0150] S8: The temperature in the furnace is reduced from 1260°C to 1170°C within 20 minutes;

[0151] S9: After the kiln temperature is kept at 1170℃ for 90 minutes, the kiln is turned off and cooled naturally until the temperature inside the kiln drops to room temperature. The kiln is opened to obtain tortoiseshell glaze Jun porcelain;

[0152] Among them, the S1-S4 stage is the oxidizing atmosphere control stage. The gate plate in the kiln is not completely closed, and there is sufficient oxygen burning in the furnace. When it reaches the 750℃ stage, the gate plate is closed, and the combustion atmosphere in the furnace begins to turn to fire, the flame supply is increased, and the fan suction is reduced to form a heavy reducing atmosphere. At 1050℃, the gate plate gap is opened, the flame supply is reduced, and the atmosphere is controlled to be a moderate reducing atmosphere. The color begins to appear. At 1260℃, the color of the Jun porcelain glaze is stable, and then the temperature is reduced to 1170℃. The temperature in the kiln is kept warm for 90 minutes for color fixation.

[0153] Furthermore, the body of the plain body is a fragrant ash body, which contains the following raw materials in parts by weight: 52 parts of kaolin, 11 parts of clay, 14 parts of quartz sand, 5 parts of wollastonite, and 18 parts of soda stone. The kaolin and clay are both produced in Huangzhen, Jia County.

[0154] Furthermore, the preparation process of the biscuit is as follows: mixing the biscuit raw materials and water by weight and grinding them to 320 mesh, injection molding the slurry, drying and biscuit firing to obtain the biscuit.

[0155] Furthermore, the preparation process of the ground glaze slurry is as follows: the raw materials of the ground glaze and water are mixed and ground to 420 mesh, left to stand for 7 hours, and the water content of the slurry is adjusted to 53%, thereby obtaining the ground glaze slurry.

[0156] Furthermore, the preparation process of the spotted glaze slurry is as follows: the raw materials of the spotted glaze and water are mixed by equal weight and ground to 420 mesh, left to stand for 7 hours, and the water content of the slurry is adjusted to 53%, thereby obtaining the spotted glaze slurry.

[0157] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A process for firing Jun porcelain with tortoise shell glaze, comprising: dipping a plain body into a base glaze slurry for 4-6 seconds for glazing; allowing the base glaze slurry to dry on the surface of the plain body; then applying a spot glaze slurry to the base glaze; and after drying, firing the base glaze in a kiln to obtain tortoise shell glaze Jun porcelain. The process is characterized by: The base glaze comprises the following raw materials in parts by weight: 23-28 parts of feldspar, 10-15 parts of calcite, 13-18 parts of quartz, 28-33 parts of black medicinal stone, 8-13 parts of iron ore, 5-10 parts of titanium ore, and 3-5 parts of black stone; the black medicinal stone is obtained from Yezhugou, Huangdao Township, Jia County, Pingdingshan City, Henan Province, and its main components are SiO2, Al2O3, and CaO; the main components of the black stone are SiO2, Al2O3, Fe2O3, and CaO; The spotted glaze comprises the following raw materials in parts by weight: 48-53 parts of white feldspar, 8-13 parts of quartz, 10-15 parts of calcite, 9-14 parts of this medicine, 1-5 parts of chlorite, 2-6 parts of zinc oxide, 1.5-3.5 parts of ilmenite, 0.5-2.5 parts of bone powder, 3-7 parts of copper ore, 1-5 parts of talc, 1-3 parts of ruthenium, 1-3 parts of amethyst, and 1-2 parts of cerium dioxide; the bone powder is calcined cattle bone powder, the chlorite is Yuzhou chlorite; the this medicine is Jiushan chlorite, a natural ore for glaze, produced in Li Village, Jiushan Township, Yuzhou; The temperature changes in the kiln during the firing process are divided into the following stages: S1: The temperature in the furnace increases from 20°C to 100°C within 30 minutes; S2: The temperature in the furnace is increased from 100°C to 300°C within 30 minutes; S3: The temperature in the furnace is increased from 300°C to 500°C within 30 minutes; S4: The furnace temperature is increased from 500°C to 750°C within 30 minutes; S5: The furnace temperature is increased from 750°C to 1050°C within 120 min; S6: The furnace temperature is increased from 1050°C to 1200°C within 90 min; S7: The temperature in the furnace is increased from 1200°C to 1260°C within 100 min; S8: The temperature in the furnace is reduced from 1260°C to 1170°C within 20 minutes; S9: After the kiln temperature is kept at 1170℃ for 90 minutes, the kiln is turned off and cooled naturally until the temperature inside the kiln drops to room temperature. The kiln is opened to obtain tortoiseshell glaze Jun porcelain; Among them, the S1-S4 stage is the oxidizing atmosphere control stage. The gate plate in the kiln is not completely closed, and there is sufficient oxygen burning in the furnace. When it reaches the 750℃ stage, the gate plate is closed, and the combustion atmosphere in the furnace begins to turn to fire, the flame supply is increased, and the fan suction is reduced to form a heavy reducing atmosphere. At 1050℃, the gate plate gap is opened, the flame supply is reduced, and the atmosphere is controlled to be a moderate reducing atmosphere. The color begins to appear. At 1260℃, the color of the Jun porcelain glaze is stable, and then the temperature is reduced to 1170℃. The temperature in the kiln is kept warm for 90 minutes for color fixation.

2. The process for firing Jun porcelain with tortoise shell glaze according to claim 1, characterized in that: The body of the plain body is made of incense ash, which contains the following raw materials in parts by weight: 52 parts of kaolin, 11 parts of clay, 14 parts of quartz sand, 5 parts of wollastonite, and 18 parts of soda stone. The kaolin and clay are both produced in Huangzhen, Jiaxian County.

3. The process for firing Jun porcelain with tortoise shell glaze according to claim 2, characterized in that: The preparation process of the biscuit is as follows: mixing the biscuit raw materials and water by weight to grind to 260-320 mesh, injection molding the slurry, drying and biscuit firing to obtain the biscuit.

4. The process for firing Jun porcelain with tortoise shell glaze according to claim 1, characterized in that: The preparation process of the bottom glaze slurry is as follows: the bottom glaze raw materials and water are mixed in equal weights and ground to 370-420 mesh, left to stand for 6-7 hours, and the water content of the slurry is adjusted to 48-53%, thereby obtaining the bottom glaze slurry.

5. The process for firing Jun porcelain with tortoise shell glaze according to claim 1, characterized in that: The preparation process of the spotted glaze slurry is as follows: the raw materials of the spotted glaze and water are mixed in equal weights and ground to 370-420 mesh, left to stand for 6-7 hours, and the water content of the slurry is adjusted to 48-53%, thereby obtaining the spotted glaze slurry.

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