CN111763074A - Firing method of large-diameter celadon ring - Google Patents
Firing method of large-diameter celadon ring Download PDFInfo
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- C04B33/34—Burning methods combined with glazing
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
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- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
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Abstract
The invention relates to a firing method of celadon, in particular to a firing method of a large-diameter celadon circular ring. Grinding and sieving kaolin, mixing with water and an auxiliary agent, stirring uniformly to obtain slurry, injecting the slurry into a gypsum mold to obtain a celadon ring blank, uniformly coating a layer of glaze on the surface of the celadon ring blank after biscuit firing, and then carrying out glaze firing to obtain a celadon ring blank finished product. The invention overcomes the defects that the celadon firing method in the prior art can not fire a large-diameter celadon circular ring which is not deformed and broken and has emerald green and uniform whole body, effectively prepares the celadon circular ring with large diameter, realizes the breakthrough of the process, and simultaneously has the advantages of same color as the celadon circular ring, greatly improved aesthetic property and higher sintering success rate.
Description
Technical Field
The invention relates to a firing method of celadon, in particular to a firing method of a large-diameter celadon circular ring.
Background
The Longquan celadon is a treasure of traditional Chinese Han porcelain, and is manufactured by Longquan people in Zhejiang in the period of the south-north dynasty by using local superior natural conditions. The eminence of Jing she Longquan celadon at the present stage represents that glittering and translucent pink green glaze and plum green glaze are fired as early as Nansong to achieve the peak, and the green glaze is jade, bright as mirror, thin as paper, and sound as chime. The ancient kiln sites for firing celadon in Longquan city are more than 500, and the ancient kiln sites in Longquan city are more than 360, which are called Longquan kilns.
In the existing celadon product, the celadon circular ring has a higher position in the field of celadon because of attractive appearance and good moral meaning. At present, only a single ring with the diameter like a bracelet can be prepared by the existing process, and for a celadon ring with a larger size specification, the celadon ring cannot be completely fired by the existing technology due to larger size and larger mass, and the defects of deformation, breakage and fracture often occur in the firing process.
Meanwhile, the existing celadon (such as a porcelain bowl, a porcelain bottle and the like) has a celadon vessel with a regular shape, and the existing celadon vessel needs to be in contact with a kiln plate erected at the top end of a kiln column in the sintering process, so that the bottom of the celadon vessel is usually inconsistent with the color of the vessel body, and therefore the traditional celadon sintering method cannot be used for firing ornaments which need the same color of the whole body and have jade-like texture of the whole body, such as a celadon bracelet, a celadon ring and other articles which need uniform color.
Disclosure of Invention
The invention aims to overcome the defect that the celadon firing method in the prior art can not fire a large-diameter celadon ring which is not deformed and broken and has emerald green and uniform whole body, and provides the firing method capable of effectively firing the celadon ring with larger diameter size.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a firing method of a large-diameter celadon circular ring comprises the following steps:
(S.1) slurry preparation: grinding and sieving kaolin, mixing with water and an auxiliary agent, and uniformly stirring to obtain slurry;
(S.2) preparing a mould: mixing gypsum powder and water according to different proportions to obtain two gypsum raw materials with different water absorbability, and mixing and molding the gypsum raw materials to obtain a gypsum mold with a celadon ring blank mold cavity inside;
(S.3) slip casting: injecting the prepared slurry into a gypsum mold to obtain a celadon ring blank;
(S.4) preparation before firing: uniformly inserting a plurality of silicon rods with tail ends facing to the circle center of the celadon ring blank into the inner surface of the celadon ring blank, erecting the silicon rods at the upper end of a kiln column with a kiln plate at the upper end, and pressing the kiln plate at the upper end of the silicon rods, so that the celadon ring blank is arranged in an overhead manner;
(S.5) bisque firing: drying the celadon ring blank and then carrying out biscuit firing to obtain a celadon ring semi-finished product;
(S.6) glazing: uniformly coating a layer of glaze on the surface of the celadon ring semi-finished product;
(S.7) glaze firing: and (4) glaze firing is carried out on the celadon ring semi-finished product with the glaze to obtain a celadon ring finished product.
Compared with the prior art, the celadon ring has different places. Firstly, two different gypsum raw materials with different water absorption capacities are prepared by adopting two different proportions of gypsum powder and water in the preparation process of a gypsum mold, then the gypsum raw material with high water absorption is arranged inside a celadon ring blank mold cavity of the gypsum mold, the gypsum raw material with low water absorption is arranged outside the celadon ring blank mold cavity of the gypsum mold, when slurry is injected into the celadon ring blank mold cavity, because the gypsum inside the celadon ring blank mold cavity has high water absorption, the water on the inner side of the obtained celadon ring blank is less and more dry, the mechanical strength of the celadon ring blank is more excellent than that on the outer side of the celadon ring blank, further preparation is carried out for inserting a silicon rod as a support on the inner surface of the celadon ring blank in the next step, and the outer side of the celadon ring blank still can be molded due to more water, and when the outer shape of the celadon.
Compared with the prior art, the invention has the second technical characteristic that the placement mode adopted in the process of biscuit firing and glaze firing is greatly different from the prior art. Because the diameter of the celadon ring in the invention is larger, the weight and other parameters of the celadon ring are greatly different from those of the existing celadon ring, and the used firing method is also different. Because the diameter of the celadon ring is larger, the traditional kiln column and kiln plate for firing celadon ware cannot be used for firing the celadon ware. In addition, the traditional celadon needs to place a blank body to be fired on a kiln plate during firing, so that the part of the bottom of the celadon, which is in contact with the kiln plate, cannot be glazed during firing, and the color of the blank body is inconsistent with the color of a vessel body, which is not harmful and elegant on the traditional bottle-type vessels (such as domestic bowls and porcelain vases), but the defect is fatal to a celadon ring playing a decorative role. According to the invention, the silicon rods are inserted into the inner surface of the celadon ring blank, the tail ends of the silicon rods point to the circle center of the celadon ring blank, each silicon rod can share part of the weight of the celadon ring blank, the silicon rods are uniformly arranged, so that the force borne by each silicon rod is consistent, the deformation of the celadon ring blank is prevented, then the silicon rods are placed on the kiln plate, and then the kiln plate is pressed on the silicon rods, so that the celadon ring blank can be arranged on the kiln plate in an overhead manner, and cannot be contacted with the kiln plate in the sintering process, and the color of the sintered celadon ring is as one, and the attractiveness is greatly improved.
Preferably, the ratio of kaolin to water in step (s.1) is 100: (30-50), wherein the auxiliary agent comprises, by mass, 0.1-0.5% of organic silicon micro powder, 0.1-1% of sodium borosilicate, 1-3% of diatomite and 40000.5-1% of polyethylene glycol.
The celadon blank ring is made of kaolin which contains more silicon dioxide and aluminum oxide, and can be chemically sintered to form a whole in the high-temperature firing process, and various performance indexes of the celadon blank ring can be further improved by adding the auxiliary agent. The organic silicon micro powder and the diatomite are added, micro pores generated in the sintering process of kaolin can be filled, the density of the sintered semi-product is higher, the sodium borosilicate can be melted in the firing process, the whole semi-finished product generates a certain glass effect, the surface is smoother, and the effect is better. The polyethylene glycol can play a role in thickening, so that the slurry has higher viscosity, and fewer air holes contained in the slurry are contained, and meanwhile, the slurry has a certain bonding effect, so that the obtained celadon blank ring has a better mechanical effect.
Preferably, in the step (s.2), the ratio of gypsum to water in the celadon ring blank die cavity in the gypsum die is (1-1.3): 1, the ratio of gypsum to water outside the celadon ring blank die cavity is (1.5-1.8): 1.
the ratio of the gypsum to the water is the key for forming the celadon ring blank, and through a plurality of tests, the ratio of the gypsum to the water is (1-1.3): 1, the water-absorbing property is good, but the water is not completely absorbed, and the silicon rod has a certain toughness while maintaining a certain mechanical property, and prevents the occurrence of cracks when the silicon rod is inserted. When the proportion of gypsum is too large, the water absorption effect is too good, the celadon ring blank is too dry, the toughness is poor, cracks are easy to generate, and meanwhile, when the proportion of gypsum is too high, the precision of the mold is poor, the mold is rough and more, and the mold is not suitable for production. And when the ratio of the gypsum to the water is (1.5-1.8): its water absorbing capacity is moderate when 1, under the prerequisite of having guaranteed certain mechanical properties, the celadon ring embryo of gained still has certain shaping ability, when colliding with or need the minor repair, can shape again and conveniently repair.
Preferably, the diameter of the celadon ring blank obtained in the step (S.3) is 30-120 cm.
Preferably, the number of the silicon rods in the step (S.4) is 3-8.
Preferably, in the step (S.5), the drying temperature is 20-40 ℃, and the drying time is 24-48 h.
Preferably, in the step (S.5), the bisque firing temperature is 750-900 ℃ and the bisque firing time is 5-8 hours.
In the biscuit firing process, certain moisture still remains in the ring blank, and meanwhile, certain moisture can be formed by the decomposition of components in the material in the biscuit firing process, so that if more water vapor is contained in the kiln, the celadon product can possibly generate cracks or deform, and the final success rate is low. Therefore, the invention has multiple air release processes in the biscuit firing process, can reduce the water vapor content in the kiln and improves the success rate of final sintering.
Preferably, the glaze in the step (s.6) comprises the following components in parts by weight: 50 parts of albite powder, 20-30 parts of green mica powder, 10-30 parts of clay, 5-10 parts of sodium silicate, 1-5 parts of boric acid, 1-3 parts of polyvinyl alcohol, 0.01-0.1 part of ferrous chloride and 0.001-0.005 part of metal aluminum powder.
The glaze of the invention, the albite powder and the clay, can be hard, so that the generated enamel layer has certain hardness. Meanwhile, the albite powder can be melted at a high temperature, so that the generated glaze layer has a semitransparent jewel-like effect. The green mica contains more ferrous elements, so that the color of the finally sintered glaze layer can keep green as a whole and is just like emerald color, and a certain amount of ferrous chloride is added into the glaze layer to further improve the content of ferrous iron and further improve the emerald color. The addition of the sodium silicate and the boric acid can play a role of a fluxing agent, so that a generated glaze layer is more compact, meanwhile, the addition of the boron element can effectively improve the heat resistance of the glaze layer, and the phenomenon that the glaze layer is cracked in the heating process is prevented. The addition of the polyvinyl alcohol can increase the suspension property and the dispersibility of the glaze, and meanwhile, the bonding property between the polyvinyl alcohol and the semi-finished product after bisque firing is further improved. According to the invention, trace metal aluminum powder which can serve as a protective agent is added into the glaze, the metal aluminum powder can absorb oxygen in the air, divalent iron elements around the aluminum powder in the glaze are protected from being oxidized by the oxygen, and the finally obtained celadon is prevented from being yellow in color.
Preferably, the glaze firing temperature in the step (S.7) is 1280-1330 ℃, and the glaze firing time is 8-12 hours.
Preferably, a layer of carbon powder is uniformly laid between the two kiln plates during the glaze firing in the step (s.7).
According to the invention, a layer of carbon powder is uniformly laid between the two kiln plates, and can react with oxygen to generate carbon monoxide in the biscuit firing process, and the carbon powder has reducibility, so that a ferric iron element can be reduced into ferrous iron, and the oxygen content in the kiln can be reduced.
Therefore, the invention has the following beneficial effects:
(1) the celadon circular ring with large diameter is effectively prepared, and the breakthrough of the process is realized;
(2) the celadon circular ring has the same color, so that the attractiveness is greatly improved;
(3) the sintering success rate is higher.
Drawings
FIG. 1 is a schematic view of a structure of the present invention during sintering.
Wherein: the green ceramic ring blank 1, the silicon rod 2 and the kiln plate 3.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to represent only some, but not all, of the examples of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A firing method of a large-diameter celadon circular ring comprises the following steps:
(S.1) slurry preparation: grinding and sieving kaolin, mixing with water and an auxiliary agent, and uniformly stirring to obtain slurry;
the ratio of the kaolin to the water is 100: 30, the auxiliary agent comprises 0.1 percent of organic silicon micro powder, 0.1 percent of sodium borosilicate, 1 percent of diatomite and 40000.5 percent of polyethylene glycol by mass percent of kaolin.
(S.2) preparing a mould: mixing gypsum powder and water according to the proportion of 1: 1 and 1.5: 1, mixing to obtain two gypsum raw materials with different water absorbability, mixing and molding the gypsum raw materials to obtain a gypsum mold with an inner celadon ring blank mold cavity, wherein the water absorption of the inner part (the ratio of gypsum powder to water is 1: 1) of the celadon ring blank mold cavity of the gypsum mold is greater than that of the outer part (the ratio of gypsum powder to water is 1.5: 1) of the celadon ring blank mold cavity.
(S.3) slip casting: and injecting the prepared slurry into a gypsum mold to obtain a celadon ring blank 1 with the diameter of 30 cm.
(S.4) preparation before firing: as shown in fig. 1, 4 silicon rods 2 with tail ends facing the center of the celadon ring blank 1 are uniformly inserted into the inner surface of the celadon ring blank, then the silicon rods are erected at the upper end of a kiln column with a kiln plate 3 at the upper end, and then the kiln plate 3 is pressed against the upper end of the silicon rods, so that the celadon ring blank 1 is arranged in an overhead manner.
(S.5) bisque firing: and drying the celadon ring blank at 30 ℃ for 24 hours, and then carrying out biscuit firing at 750 ℃ for 5 hours to obtain a semi-finished celadon ring.
(S.6) glazing: uniformly coating a layer of glaze on the surface of the celadon ring semi-finished product, wherein the glaze comprises the following components in parts by weight: 50 parts of albite powder, 20 parts of green mica powder, 10 parts of clay, 5 parts of sodium silicate, 1 part of boric acid, 1 part of polyvinyl alcohol, 0.01 part of ferrous chloride and 0.001 part of metal aluminum powder.
(S.7) glaze firing: and (4) glazing and firing the celadon ring semi-finished product with the glaze at 1280 ℃ for 8 hours to obtain the celadon ring finished product.
Example 2
A firing method of a large-diameter celadon circular ring comprises the following steps:
(S.1) slurry preparation: grinding and sieving kaolin, mixing with water and an auxiliary agent, and uniformly stirring to obtain slurry;
the ratio of the kaolin to the water is 100: 50, the auxiliary agent comprises 0.5 percent of organic silicon micro powder, 1 percent of sodium borosilicate, 3 percent of diatomite and 40001 percent of polyethylene glycol by mass percent of kaolin.
(S.2) preparing a mould: mixing gypsum powder and water according to the proportion of 1.3: 1 and 1.8: 1 mixing to obtain two gypsum raw materials with different water absorbability, mixing and molding the gypsum raw materials to obtain a gypsum mold with an inner celadon ring blank mold cavity, wherein the water absorbability inside the celadon ring blank mold cavity of the gypsum mold (the ratio of gypsum powder to water is 1.3: 1) is higher than that outside the celadon ring blank mold cavity (the ratio of gypsum powder to water is 1.8: 1).
(S.3) slip casting: and injecting the prepared slurry into a gypsum mold to obtain a celadon ring blank with the diameter of 120 cm.
(S.4) preparation before firing: evenly insert 8 silicon rods 2 of tail end orientation celadon ring embryo 1 centre of a circle to celadon ring embryo internal surface, then erect the silicon rod in the kiln post upper end that the upper end was equipped with kiln board 3, then press to establish a kiln board 3 to the silicon rod upper end to make somebody a mere figurehead with celadon ring embryo 1 sets up.
(S.5) bisque firing: and (3) drying the celadon ring blank at 20 ℃ for 48h in a ventilating way, and then carrying out biscuit firing at 900 ℃ for 8h to obtain a semi-finished celadon ring.
(S.6) glazing: uniformly coating a layer of glaze on the surface of the celadon ring semi-finished product, wherein the glaze comprises the following components in parts by weight: 50 parts of albite powder, 30 parts of green mica powder, 30 parts of clay, 10 parts of sodium silicate, 5 parts of boric acid, 3 parts of polyvinyl alcohol, 0.1 part of ferrous chloride and 0.005 part of metal aluminum powder.
(S.7) glaze firing: and uniformly paving a layer of carbon powder between the two kiln plates, and then carrying out glaze firing on the celadon circular ring semi-finished product with the glaze material, wherein the glaze firing temperature is 1330 ℃, and the glaze firing time is 12 hours, so as to obtain the celadon circular ring finished product.
Example 3
A firing method of a large-diameter celadon circular ring comprises the following steps:
(S.1) slurry preparation: grinding and sieving kaolin, mixing with water and an auxiliary agent, and uniformly stirring to obtain slurry;
the ratio of the kaolin to the water is 100: 40, the auxiliary agent comprises 0.3 percent of organic silicon micro powder, 0.8 percent of sodium borosilicate, 2 percent of diatomite and 40000.8 percent of polyethylene glycol by mass percent of kaolin.
(S.2) preparing a mould: mixing gypsum powder and water according to the proportion of 1.1: 1 and 1.6: 1 mixing to obtain two gypsum raw materials with different water absorbability, mixing and molding the gypsum raw materials to obtain a gypsum mold with an inner celadon ring blank mold cavity, wherein the water absorbability inside the celadon ring blank mold cavity of the gypsum mold (the ratio of gypsum powder to water is 1.1: 1) is higher than that outside the celadon ring blank mold cavity (the ratio of gypsum powder to water is 1.6: 1).
(S.3) slip casting: and injecting the prepared slurry into a gypsum mold to obtain a celadon ring blank with the diameter of 100 cm.
(S.4) preparation before firing: evenly insert 3 silicon rods 2 that establish the tail end towards the 1 centre of a circle of celadon ring embryo to celadon ring embryo internal surface, then erect the silicon rod in the kiln post upper end that the upper end is equipped with kiln board 3, then press to establish a kiln board 3 to the silicon rod upper end to make somebody a mere figurehead setting of celadon ring embryo 1.
(S.5) bisque firing: and (3) drying the celadon ring blank at 40 ℃ for 24h in a ventilating way, and then carrying out biscuit firing at 800 ℃ for 6h to obtain a semi-finished celadon ring.
(S.6) glazing: uniformly coating a layer of glaze on the surface of the celadon ring semi-finished product, wherein the glaze comprises the following components in parts by weight: 50 parts of albite powder, 25 parts of green mica powder, 20 parts of clay, 8 parts of sodium silicate, 2 parts of boric acid, 2 parts of polyvinyl alcohol, 0.05 part of ferrous chloride and 0.002 part of metal aluminum powder.
(S.7) glaze firing: and (3) glazing and firing the celadon ring semi-finished product with the glaze at 1300 ℃ for 10 hours to obtain the celadon ring finished product.
Example 4
A firing method of a large-diameter celadon circular ring comprises the following steps:
(S.1) slurry preparation: grinding and sieving kaolin, mixing with water and an auxiliary agent, and uniformly stirring to obtain slurry;
the ratio of the kaolin to the water is 100: 45, the auxiliary agent comprises 0.4 percent of organic silicon micro powder, 0.8 percent of sodium borosilicate, 1.5 percent of diatomite and 40000.6 percent of polyethylene glycol by mass percent of kaolin.
(S.2) preparing a mould: mixing gypsum powder and water according to the proportion of 1.2: 1 and 1.7: 1, mixing to obtain two gypsum raw materials with different water absorbability, mixing and molding the gypsum raw materials to obtain a gypsum mold with an inner celadon ring blank mold cavity, wherein the water absorbability inside the celadon ring blank mold cavity of the gypsum mold (the ratio of gypsum powder to water is 1.2: 1) is higher than that outside the celadon ring blank mold cavity (the ratio of gypsum powder to water is 1.7: 1).
(S.3) slip casting: and injecting the prepared slurry into a gypsum mold to obtain a celadon ring blank with the diameter of 100 cm.
(S.4) preparation before firing: the silicon rods 2 with the tail ends facing the circle center of the celadon ring blank 1 are evenly inserted into the inner surface of the celadon ring blank, then the silicon rods are erected at the upper end of a kiln column with a kiln plate 3 at the upper end, and then the kiln plate 3 is pressed at the upper end of the silicon rods, so that the celadon ring blank 1 is arranged in an overhead mode.
(S.5) bisque firing: and (3) drying the celadon ring blank at 25 ℃ for 36h in a ventilating way, and then carrying out biscuit firing at 850 ℃ for 7 h to obtain a semi-finished celadon ring product.
(S.6) glazing: uniformly coating a layer of glaze on the surface of the celadon ring semi-finished product, wherein the glaze comprises the following components in parts by weight: 50 parts of albite powder, 25 parts of green mica powder, 20 parts of clay, 8 parts of sodium silicate, 3 parts of boric acid, 2 parts of polyvinyl alcohol, 0.07 part of ferrous chloride and 0.004 part of metal aluminum powder.
(S.7) glaze firing: and (3) glazing and firing the celadon ring semi-finished product with the glaze at 1305 ℃ for 10 hours to obtain the celadon ring finished product.
Example 5
A firing method of a large-diameter celadon circular ring comprises the following steps:
(S.1) slurry preparation: grinding and sieving kaolin, mixing with water and an auxiliary agent, and uniformly stirring to obtain slurry;
the ratio of the kaolin to the water is 100: 35, the auxiliary agent comprises 0.4% of organic silicon micro powder, 0.2% of sodium borosilicate, 2.5% of diatomite and 40000.75% of polyethylene glycol in percentage by mass of kaolin.
(S.2) preparing a mould: mixing gypsum powder and water according to the proportion of 1.2: 1 and 1.8: 1, mixing to obtain two gypsum raw materials with different water absorbability, mixing and molding the gypsum raw materials to obtain a gypsum mold with an inner celadon ring blank mold cavity, wherein the water absorbability inside the celadon ring blank mold cavity of the gypsum mold (the ratio of gypsum powder to water is 1.2: 1) is higher than that outside the celadon ring blank mold cavity (the ratio of gypsum powder to water is 1.8: 1).
(S.3) slip casting: and injecting the prepared slurry into a gypsum mold to obtain a celadon ring blank with the diameter of 110 cm.
(S.4) preparation before firing: evenly insert 4 silicon rods 2 of tail end orientation celadon ring embryo 1 centre of a circle to celadon ring embryo internal surface, then erect the silicon rod in the kiln post upper end that the upper end was equipped with kiln board 3, then press to establish a kiln board 3 to the silicon rod upper end to make somebody a mere figurehead with celadon ring embryo 1 sets up.
(S.5) bisque firing: and (3) drying the celadon ring blank at 35 ℃ for 30h in a ventilating way, and then carrying out biscuit firing at 780 ℃ for 6h to obtain a semi-finished celadon ring.
(S.6) glazing: uniformly coating a layer of glaze on the surface of the celadon ring semi-finished product, wherein the glaze comprises the following components in parts by weight: 50 parts of albite powder, 28 parts of green mica powder, 12 parts of clay, 6 parts of sodium silicate, 4 parts of boric acid, 3 parts of polyvinyl alcohol, 0.1 part of ferrous chloride and 0.0045 part of metal aluminum powder.
(S.7) glaze firing: and uniformly paving a layer of carbon powder between the two kiln plates, and then carrying out glaze firing on the celadon circular semi-finished product with the glaze material, wherein the glaze firing temperature is 1310 ℃, and the glaze firing time is 10 hours, so as to obtain the celadon circular finished product.
Claims (9)
1. The firing method of the large-diameter celadon circular ring is characterized by comprising the following steps of:
(S.1) slurry preparation: grinding and sieving kaolin, mixing with water and an auxiliary agent, and uniformly stirring to obtain slurry;
(S.2) preparing a mould: mixing gypsum powder and water according to different proportions to obtain two gypsum raw materials with different water absorbability, mixing and molding the gypsum raw materials to obtain a gypsum mold with an celadon ring blank mold cavity inside, wherein the water absorption rate inside the celadon ring blank mold cavity of the gypsum mold is greater than that outside the celadon ring blank mold cavity;
(S.3) slip casting: injecting the prepared slurry into a gypsum mold to obtain a celadon ring blank;
(S.4) preparation before firing: uniformly inserting a plurality of silicon rods with tail ends facing to the circle center of the celadon ring blank into the inner surface of the celadon ring blank, erecting the silicon rods at the upper end of a kiln column with a kiln plate at the upper end, and pressing the kiln plate at the upper end of the silicon rods, so that the celadon ring blank is arranged in an overhead manner;
(S.5) bisque firing: drying the celadon ring blank and then carrying out biscuit firing to obtain a celadon ring semi-finished product;
(S.6) glazing: uniformly coating a layer of glaze on the surface of the celadon ring semi-finished product;
(S.7) glaze firing: and (4) glaze firing is carried out on the celadon ring semi-finished product with the glaze to obtain a celadon ring finished product.
2. The firing method of the celadon circular ring with the large diameter according to claim 1, wherein the ratio of kaolin to water in the step (s.1) is 100: (30-50), wherein the auxiliary agent comprises, by mass, 0.1-0.5% of organic silicon micro powder, 0.1-1% of sodium borosilicate, 1-3% of diatomite and 40000.5-1% of polyethylene glycol.
3. The firing method of the large-diameter celadon circular ring according to claim 1, wherein in the step (S.2), the ratio of gypsum to water in the celadon ring blank die cavity in the gypsum die is (1-1.3): 1, the ratio of gypsum to water outside the celadon ring blank die cavity is (1.5-1.8): 1.
4. the firing method of the large-diameter celadon ring as claimed in claim 1, wherein the diameter of the celadon ring blank obtained in the step (S.3) is 30-120 cm.
5. The firing method of the celadon circular ring with the large diameter as claimed in claim 1, wherein the number of the silicon rods in the step (S.4) is 3-8.
6. The firing method of the large-diameter celadon ring according to claim 1, wherein in the step (S.5), the drying temperature is 20-40 ℃, and the drying time is 24-48 h.
7. The firing method of the celadon circular ring with the large diameter according to claim 1 or 6, wherein the bisque firing temperature in the step (S.5) is 750 to 900 ℃, and the bisque firing time is 5 to 8 hours.
8. The firing method of the celadon circular ring with the large diameter as claimed in claim 1, wherein the glaze in the step (S.6) comprises the following components in parts by weight: 50 parts of albite powder, 20-30 parts of green mica powder, 10-30 parts of clay, 5-10 parts of sodium silicate, 1-5 parts of boric acid, 1-3 parts of polyvinyl alcohol, 0.01-0.1 part of ferrous chloride and 0.001-0.005 part of metal aluminum powder.
9. The firing method of the celadon ring with the large diameter according to claim 1, wherein the glaze firing temperature in the step (S.7) is 1280 to 1330 ℃, and the glaze firing time is 8 to 12 hours.
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