Longquan celadon and a preparation method thereof

Abstract

This invention provides a Longquan celadon and its preparation method, belonging to the field of ceramic materials and decorative technology. Specifically, this invention is an innovative "double-glaze combination" crackling technique. The body of this invention adopts a composite system of "Di kiln basic clay + Ge kiln modified purple clay," significantly increasing the iron and aluminum content in the body and moderately increasing the thermal expansion coefficient and "rigidity" of the body, enabling it to generate more stable support and reaction force for the glaze layer during cooling. The "double-glaze combination" glazing process is used on the body surface: first, a non-cracking Di kiln powder blue glaze is applied, and then some areas are removed from the glaze surface. Then, a plum-green crackling glaze is filled into the removed spaces. This glaze is a high-expansion coefficient, high-tension crackling glaze, and acts as a "stress engine" to drive the Di kiln glaze to produce secondary crackling. Utilizing the glaze characteristics of Ge and Di kilns, a celadon product with a unique sense of layering, density variation, and growth-like visual artistic effect is generated.

Description

Technical Field

[0001] This invention belongs to the field of ceramic materials and decorative technology, specifically relating to a Longquan celadon and its preparation method. Background Technology

[0002] Longquan ware from Zhejiang Province, one of the five famous kilns of the Song Dynasty, holds an important place in the history of world ceramics for its unique Ge ware crackle patterns and warm, jade-like glaze. Traditional Ge ware crackle patterns are rich in variety and have a mature system, commonly including crab claw patterns, fish roe patterns, hundred-crack patterns, and ice crack patterns. The core technique lies in adjusting the glaze formula (such as increasing quartz content and introducing components with high expansion coefficients) and the material ratio of the clay. The interaction between the clay and glaze causes the crackle to form naturally and evenly distribute across the entire surface of the porcelain, creating a densely interwoven visual effect. While this classic crackle style appears full and complete, reflecting a high degree of control over traditional porcelain-making techniques, its often uniform and rhythmic distribution can easily lack a sense of hierarchy and variation in form within the overall visual appeal. In the contemporary aesthetic context, its expressive form and artistic tension have certain limitations, making it difficult to further echo the rhythm and spatial expression of the vessel's shape.

[0003] Therefore, how to break through the random and uniform distribution of traditional crackle textures and achieve hierarchical and directional crackle textures has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a Longquan celadon and its preparation method. The preparation method provided by this invention is an innovative "double glaze combination" crackle effect, that is, to partially remove the glaze surface of the Di kiln (non-crackled), and then fill the removed space with the glaze slurry of the Ge kiln (crackled), so that after firing, a unique "Ge-Di kiln double glaze combination" crackle effect is formed: the texture of the Ge kiln crackle area is fine and uniform, and at this place, through the crackle tension of the Ge kiln, continuous linear crackles grow upward and conform to the shape, forming a new artistic effect of contrast and coexistence of "surface" and "line", "dense" and "sparse", "still" and "moving", which can achieve layered and directional crackle texture.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for preparing Longquan celadon, comprising the following steps: (1) Mix the foundation clay of the Di kiln, the purple gold clay of the Ge kiln, and an inorganic solvent to obtain clay material; the raw materials of the foundation clay of the Di kiln, by mass percentage of dry material, include: 42-50% porcelain clay, 22-30% quartz, 20-25% feldspar, and 1-3% purple gold clay; the raw materials of the purple gold clay of the Ge kiln, by mass percentage of dry material, include: 40-50% purple gold clay, 30-40% kaolin, and 10-20% quartz. (2) The clay obtained in step (1) is successively shaped and bisque-fired to obtain a bisque blank; (3) Apply glaze to the surface of the unglazed body obtained in step (2) using the Di kiln celadon glaze slurry to obtain a glazed body; the raw materials of the Di kiln celadon glaze slurry include, by dry weight percentage: 25-30% kaolin, 23-26% porcelain clay, 15.5-16.5% limestone, 8.5-9.5% purple clay and 22-24% wood ash; (4) The surface of the glazed blank obtained in step (3) is partially removed to obtain a glazed blank with partially exposed unglazed blank; (5) The Ge kiln plum green crackle glaze slurry is used to fill the exposed bisque part of the glaze blank obtained in step (4), and then the oxidation-reduction firing is carried out to obtain Longquan celadon; the raw materials of the Ge kiln plum green crackle glaze slurry include, by dry weight percentage: 5-10% purple clay, 10-20% kaolin, 22-25% limestone, 20-30% quartz and 15-30% feldspar.

[0006] Preferably, in step (1), the mass of Ge kiln purple clay is 15-30% of the total mass of Di kiln foundation clay and Ge kiln purple clay.

[0007] Preferably, in step (1), the content of Fe2O3 in Ge kiln purple clay is 5.5~7.5wt%, the content of Al2O3 is 20~25wt%, and the content of SiO2 is 1.0~1.5wt%.

[0008] Preferably, the raw materials of the Di kiln celadon glaze slurry in step (3) include, by mass percentage of dry materials: 26-29% kaolin, 24-25% porcelain clay, 15.8-16.2% limestone, 8.8-9.2% purple clay and 23-24% wood ash.

[0009] Preferably, the raw materials of the Ge kiln plum green crackle glaze slurry in step (5) include, by mass percentage of dry material: 6-9% purple clay, 12-18% kaolin, 23-24% limestone, 22-28% quartz and 20-25% feldspar.

[0010] Preferably, the oxidation-reduction calcination in step (5) includes sequentially performing a first heating, a first holding, a second heating, a second holding, a first cooling, a second cooling, and a third cooling; the first heating rate is 140~160℃ / h, the first heating time is 6.5~7.5h, and the final temperature of the first heating is 1050℃; the first holding time is 2~3h; the second heating rate is 75~95℃ / h, the second heating time is 2.5~3.5h, and the final temperature of the second heating is 1285℃; the second holding time is 10~30min; the first cooling rate is 95~105℃ / h, and the final temperature of the first cooling is 800℃; the second cooling rate is 25~30℃ / h, and the final temperature of the second cooling is 400℃; the third cooling is furnace cooling.

[0011] Preferably, both the first heating and the first heat preservation are carried out in an oxidizing atmosphere.

[0012] Preferably, both the second heating and the second heat preservation are carried out in a reducing atmosphere.

[0013] Preferably, the total time for the first heating, the first holding, the second heating, and the second holding is 10-15 hours.

[0014] The present invention also provides Longquan celadon prepared by the preparation method described in the above technical solution.

[0015] This invention provides a method for preparing Longquan celadon, comprising the following steps: mixing the basic clay of the Di kiln, the purple-gold clay of the Ge kiln, and an inorganic solvent to obtain a clay material; the raw materials of the Di kiln basic clay, by dry weight percentage, include: 42-50% porcelain clay, 22-30% quartz, 20-25% feldspar, and 1-3% purple-gold clay; the raw materials of the Ge kiln purple-gold clay, by dry weight percentage, include: 40-50% purple-gold clay, 30-40% kaolin, and 10-20% quartz; shaping and bisque-firing the clay material sequentially to obtain a bisque body; applying a Di kiln powder blue glaze slurry to the surface of the bisque body to obtain a glazed body; the raw materials of the Di kiln powder blue glaze slurry include: 42-50% porcelain clay, 22-30% quartz, 20-25% feldspar, and 1-3% purple-gold clay; the raw materials of the Di kiln powder blue glaze slurry include: 40-50% purple-gold clay, 30-40% kaolin, and 10-20% quartz; the clay material is then shaped and bisque-fired to obtain a bisque body; a glaze is then applied to the surface of the bisque body using Di kiln powder blue glaze slurry, to obtain a glazed body; the raw materials of the Di kiln powder blue glaze slurry include: 42-50% porcelain clay, 22-30% quartz, 20-25% feldspar, and 1-3% purple-gold clay; the raw materials of the Ge kiln powder blue glaze slurry include: 40-50% purple-gold clay, The dry materials, by weight percentage, include: 25-30% kaolin, 23-26% porcelain clay, 15.5-16.5% limestone, 8.5-9.5% purple clay, and 22-24% wood ash. Partial removal is performed on the surface of the glazed body to obtain a partially exposed glazed body. A Ge kiln plum-green crackle glaze is applied to fill the exposed glazed body, followed by oxidation-reduction firing to obtain Longquan celadon. The raw materials of the Ge kiln plum-green crackle glaze, by weight percentage, include: 5-10% purple clay, 10-20% kaolin, 22-25% limestone, 20-30% quartz, and 15-30% feldspar. This invention employs a composite system of "Di kiln basic clay + Ge kiln purple gold clay modification," which significantly increases the iron and aluminum content in the body, moderately increases the thermal expansion coefficient and "rigidity" of the body, enabling it to provide more stable support and reaction force to the glaze layer during cooling. The body, as the foundation of porcelain, plays a crucial role in the overall effect of "double glaze combination." A non-crackled Di kiln celadon glaze is applied to the surface of the body, and some areas are removed from the glaze surface. Then, a plum-green crackled glaze is filled into the removed space. This glaze is a crackled glaze with a high expansion coefficient and high tension, and acts as a "stress engine" to drive the Di kiln glaze to produce secondary crazing. By utilizing the glaze characteristics of Ge kiln and Di kiln, celadon products with a unique sense of layering, density variation, and growth-like visual artistic effect are generated. Attached Figure Description

[0016] Figure 1 The image shows the actual Longquan celadon porcelain prepared in Example 1. Figure 2 This is a photograph of the Longquan celadon porcelain prepared in Example 2. Figure 3 The image shows the actual Longquan celadon porcelain prepared in Example 3. Figure 4 The image shows the actual Longquan celadon prepared in Comparative Example 1. Figure 5 The image shows the actual Longquan celadon prepared in Comparative Example 2. Figure 6 The image shows the actual Longquan celadon prepared in Comparative Example 3. Detailed Implementation

[0017] This invention also provides a method for preparing Longquan celadon, comprising the following steps: (1) Mix the foundation clay of the Di kiln, the purple gold clay of the Ge kiln, and an inorganic solvent to obtain clay material; the raw materials of the foundation clay of the Di kiln, by mass percentage of dry material, include: 42-50% porcelain clay, 22-30% quartz, 20-25% feldspar, and 1-3% purple gold clay; the raw materials of the purple gold clay of the Ge kiln, by mass percentage of dry material, include: 40-50% purple gold clay, 30-40% kaolin, and 10-20% quartz. (2) The clay obtained in step (1) is successively shaped and bisque-fired to obtain a bisque blank; (3) Apply glaze to the surface of the unglazed body obtained in step (2) using the Di kiln celadon glaze slurry to obtain a glazed body; the raw materials of the Di kiln celadon glaze slurry include, by dry weight percentage: 25-30% kaolin, 23-26% porcelain clay, 15.5-16.5% limestone, 8.5-9.5% purple clay and 22-24% wood ash; (4) The surface of the glazed blank obtained in step (3) is partially removed to obtain a glazed blank with partially exposed unglazed blank; (5) The Ge kiln plum green crackle glaze slurry is used to fill the exposed bisque part of the glaze blank obtained in step (4), and then the oxidation-reduction firing is carried out to obtain Longquan celadon; the raw materials of the Ge kiln plum green crackle glaze slurry include, by dry weight percentage: 5-10% purple clay, 10-20% kaolin, 22-25% limestone, 20-30% quartz and 15-30% feldspar.

[0018] This invention does not impose any special restrictions on the source of the raw materials; commercially available products familiar to those skilled in the art can be used.

[0019] In one implementation, the porcelain clay can be from the Sangxiyang porcelain clay mining site in Linggen Village, Longquan City, Zhejiang Province; the purple clay can be from the Wuling porcelain clay mining site in Zhuyang Village, Baoxi Township, Longquan City, Zhejiang Province; the kaolin can be from the Xiyuan porcelain clay mining site in Yuandi Village, Longquan City, Zhejiang Province; the quartz can be from the Changgang mining site in Nanlong Village, Lanju Township, Longquan City, Zhejiang Province; the feldspar can be from the Nanyuan mining site in Shangdun Village, Chatian Town, Longquan City, Zhejiang Province; the limestone can be from the Houzhuang mining site in Shenji Village, Daotai Township, Longquan City, Zhejiang Province; and the wood ash can be from the Tangshang collection site in Yejiao Village, Badu Town, Longquan City, Zhejiang Province.

[0020] This invention mixes the foundation clay of the Di kiln, the purple gold clay of the Ge kiln, and an inorganic solvent to obtain clay material.

[0021] In this invention, the raw materials of the foundation clay for the Di kiln, by mass percentage, comprise: 42-50% porcelain clay, 22-30% quartz, 20-25% feldspar, and 1-3% purple clay. As one embodiment, the mass percentage of the porcelain clay can be 43%, 44%, 45%, 46%, 47%, 48%, or 49%; the mass percentage of the quartz can be 23%, 24%, 25%, 26%, 27%, 28%, or 29%; the mass percentage of the feldspar can be 21%, 22%, 23%, or 24%; and the mass percentage of the purple clay can be 2%. The foundation clay for the Di kiln of this invention is a fine, highly plastic clay base.

[0022] The present invention does not impose any special limitations on the particle size of the kaolin, quartz, feldspar and purple clay, and commercially available products known to those skilled in the art can be used.

[0023] This invention does not impose any particular limitation on the preparation method of the foundation clay for the Di kiln; any preparation method well known to those skilled in the art can be used. As one embodiment, the preparation method of the foundation clay for the Di kiln can be a mixture of porcelain clay, quartz, feldspar, and purple clay.

[0024] In this invention, the raw materials of the Ge kiln purple clay, by weight percentage of dry material, comprise: 40-50% purple clay, 30-40% kaolin, and 10-20% quartz. As one embodiment, the weight percentage of the purple clay can be 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, or 49%; the weight percentage of the kaolin can be 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, or 39%; and the weight percentage of the quartz can be 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or 19%.

[0025] The present invention does not impose any special limitations on the particle size of the purple clay, kaolin, and quartz, and commercially available products well known to those skilled in the art can be used.

[0026] This invention does not impose any particular limitation on the preparation method of the Ge kiln purple clay; any preparation method well known to those skilled in the art can be used. As one embodiment, the preparation method of the Ge kiln purple clay can be a mixture of purple clay, kaolin, and quartz.

[0027] In this invention, the preferred content of Fe2O3 in the Ge kiln purple clay is 5.5~7.5wt%; the preferred content of Al2O3 in the Ge kiln purple clay is 20~25wt%; and the preferred content of SiO2 in the Ge kiln purple clay is 1.0~1.5wt%. By limiting the contents of Fe2O3, Al2O3, and SiO2 in the Ge kiln purple clay to the above ranges, this invention can significantly increase the iron and aluminum content of the body, moderately increase the coefficient of thermal expansion of the body, and increase the "rigidity" of the body. This allows it to generate more stable support and reaction force on the glaze layer (especially the high-tension Ge kiln glaze) during cooling, which is an important basis for inducing directional crazing.

[0028] In one embodiment, the Fe2O3 content in the Ge kiln purple clay can be 5.6wt%, 5.7wt%, 5.8wt%, 5.9wt%, 6.0wt%, 6.1wt%, 6.2wt%, 6.3wt%, 6.4wt%, 6.5wt%, 6.6wt%, 6.7wt%, 6.8wt%, 6.9wt%, 7.0wt%, 7.1wt%, 7.2wt%, 7.3wt%, or 7.4wt%; the Al2O3 content in the Ge kiln purple clay can be 21wt%, 22wt%, 23wt%, or 24wt%; and the SiO2 content in the Ge kiln purple clay can be 1.1wt%, 1.2wt%, 1.3wt%, or 1.4wt%.

[0029] This invention does not impose any special limitations on other components in the Ge kiln purple gold clay; any Ge kiln purple gold clay well known to those skilled in the art can be used.

[0030] In this invention, the preferred mass of the Ge kiln purple-gold clay is 15-30% of the total mass of the Di kiln foundation clay and the Ge kiln purple-gold clay. As one embodiment, the mass of the Ge kiln purple-gold clay can be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, or 29% of the total mass of the Di kiln foundation clay and the Ge kiln purple-gold clay. Limiting the mass of the Ge kiln purple-gold clay to the above range allows for a more stable support and reaction force on the glaze layer.

[0031] This invention does not impose any particular limitation on the type of inorganic solvent; any inorganic solvent well-known to those skilled in the art can be used. As one embodiment, the inorganic solvent may be water.

[0032] The present invention does not impose any special limitation on the amount of the inorganic solvent used; it can be adjusted according to actual needs.

[0033] In this invention, the mixing of the foundation clay of the Di kiln, the purple-gold clay of the Ge kiln, and the inorganic solvent is preferably done by ball milling. This invention does not impose any special limitations on the ball milling operation; any ball milling operation well-known to those skilled in the art can be used.

[0034] After mixing, the present invention preferably sieves and ages the product obtained by mixing in sequence.

[0035] In this invention, the moisture content of the product obtained by mixing is preferably 23-25%.

[0036] The present invention does not impose any special limitations on the sieving operation; any operation well known to those skilled in the art can be used. As one embodiment, the sieving is preferably performed through a 250-mesh sieve.

[0037] This invention does not impose any particular limitation on the aging process; any aging operation well-known to those skilled in the art can be used. As one embodiment, the aging time can be 48 hours. In this invention, the aging process, through microbial action and ion exchange, greatly improves the plasticity and binding strength of the clay.

[0038] After obtaining the clay, the present invention will sequentially shape and fire the clay to obtain a bisque.

[0039] In this invention, the forming process is preferably wheel forming. This invention does not impose any special limitations on the wheel forming operation; any operation well-known to those skilled in the art can be used.

[0040] The present invention does not impose any special limitations on the shape of the green blank, which can be adjusted according to actual needs.

[0041] After molding is completed, the present invention preferably dries the product obtained by molding.

[0042] In this invention, the drying is preferably done in the shade; the drying temperature is preferably room temperature.

[0043] In this invention, the bisque firing temperature is preferably 800~1000℃, more preferably 920℃; the bisque firing time is preferably 5~7h, more preferably 6h. This invention uses bisque firing to obtain a bisque blank with sufficient strength.

[0044] The present invention does not impose any particular limitation on the rate of heating to the bisque firing temperature; any heating rate known to those skilled in the art can be used.

[0045] After bisque firing, the present invention preferably cools the product obtained by bisque firing to obtain a blank.

[0046] The present invention does not impose any particular limitation on the cooling operation; any cooling operation well known to those skilled in the art can be used. As one embodiment, the cooling can be furnace-in-process cooling.

[0047] After obtaining the unglazed body, the present invention applies a celadon glaze slurry from the Di kiln to the surface of the unglazed body to obtain a glazed body.

[0048] In this invention, the raw materials of the Di kiln celadon glaze slurry, by dry weight percentage, include: 25-30% kaolin, 23-26% porcelain clay, 15.5-16.5% limestone, 8.5-9.5% purple clay, and 22-24% wood ash. As one embodiment, the weight percentage of kaolin can be 26%, 27%, 28%, or 29%; the weight percentage of porcelain clay can be 24% or 25%; the weight percentage of limestone can be 15.6%, 15.7%, 15.8%, 15.9%, 16.0%, 16.1%, 16.2%, 16.3%, or 16.4%; the weight percentage of purple clay can be 8.6%, 8.7%, 8.8%, 8.9%, 9.0%, 9.1%, 9.2%, 9.3%, or 9.4%; and the weight percentage of wood ash can be 23%. In this invention, the glaze in the Di kiln celadon glaze has a relatively low coefficient of thermal expansion, and after firing, it is celadon in color, opaque in appearance, and has a strong jade-like texture.

[0049] The present invention does not impose any special limitation on the particle size of the kaolin, porcelain clay, limestone, purple clay and plant ash, and commercially available products known to those skilled in the art can be used.

[0050] The present invention does not have a special limitation on the amount of water used in the Di kiln celadon glaze slurry; the required amount of Di kiln celadon glaze slurry can be obtained by using the amount known to those skilled in the art.

[0051] The present invention does not impose any particular limitation on the preparation method of the Di kiln celadon glaze slurry; any preparation method well known to those skilled in the art can be used. As one embodiment, the preparation method of the Di kiln celadon glaze slurry may involve weighing the glaze material according to the specified ratio, then ball milling it, and subsequently passing it through a 300-mesh sieve.

[0052] In this invention, the Baume degree of the Di kiln celadon glaze is preferably 52~55°.

[0053] In this invention, the glazing is preferably performed using an immersion glazing method. This invention does not impose any particular limitations on the operation of the immersion glazing method; any immersion glazing method well-known to those skilled in the art can be used. As one embodiment, the glazing time can be 3-5 seconds.

[0054] In this invention, the thickness of the glazed blank after glazing is preferably 0.6~0.8mm.

[0055] After glazing is completed, the present invention preferably dries the glazed product to obtain a glazed blank.

[0056] The present invention does not have any special limitations on the drying operation, and can use operations well known to those skilled in the art until the glaze completely loses its gloss.

[0057] After obtaining the glaze blank, the present invention performs partial removal on the surface of the glaze blank to obtain a glaze blank with partially exposed unglazed blank.

[0058] In this invention, it is preferable to draw a pattern on the surface of the glaze blank before partial removal. This invention does not impose any particular limitations on the pattern drawing operation; adjustments can be made according to the actual required pattern.

[0059] The present invention does not have any special limitations on the operation of the partial removal. The operation is familiar to those skilled in the art. The local powder blue glaze layer of the Di kiln is removed so that the removed area exposes the underlying unglazed body.

[0060] After partial removal is completed, the present invention preferably cleans the product obtained by partial removal to obtain a glazed blank with partially exposed unglazed body.

[0061] The present invention does not impose any special limitations on the cleaning operation; any operation known to those skilled in the art can be used to clean all glaze debris in the groove.

[0062] After obtaining a partially exposed unglazed body, the present invention uses Ge kiln plum green crackle glaze to fill the exposed unglazed body in the glazed body, and then performs oxidation-reduction firing to obtain Longquan celadon.

[0063] In this invention, the raw materials of the Ge ware plum-green crackled glaze slurry, by dry weight percentage, include: 5-10% purple clay, 10-20% kaolin, 22-25% limestone, 20-30% quartz, and 15-30% feldspar. In this invention, the glaze slurry contains a crackled glaze with a high coefficient of thermal expansion and high tensile strength. Its function is not only to create its own crackling, but also to act as a "stress engine" to drive the secondary crackling of the Ge ware glaze. Its coefficient of thermal expansion is significantly higher than that of the glaze material in the aforementioned Ge ware powder-blue glaze slurry.

[0064] In one embodiment, the mass percentage of the purple clay can be 6%, 7%, 8%, or 9%; the mass percentage of the kaolin can be 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or 19%; the mass percentage of the limestone can be 23% or 24%; the mass percentage of the quartz can be 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, or 29%; and the mass percentage of the feldspar can be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, or 29%.

[0065] The present invention does not impose any special limitation on the particle size of the purple clay, kaolin, limestone, quartz and feldspar, and commercially available products well known to those skilled in the art can be used.

[0066] This invention does not impose any particular limitation on the preparation method of the Ge ware plum-green crackled glaze slurry; any preparation method well known to those skilled in the art can be used. As one embodiment, the preparation method of the Ge ware plum-green crackled glaze slurry can be as follows: weigh the glaze material according to the specified ratio, then ball mill it, and finally pass it through a 300-mesh sieve.

[0067] In this invention, the Baume degree of the Ge kiln plum green crackle glaze is preferably 48~50°.

[0068] In this invention, the glazing is preferably done by dotting; the dotting is preferably done by applying glaze with a brush dipped in glaze slurry. This invention does not impose any special limitations on the dotting operation; any operation familiar to those skilled in the art can be used to ensure that the glazed surface is substantially flush with the surrounding glazed surface of the kiln.

[0069] After glazing, the product obtained by glazing is dried. The present invention does not have specific limitations on the drying operation; surface drying can be achieved using methods well-known to those skilled in the art.

[0070] In this invention, the oxidation-reduction calcination preferably includes sequentially performing a first heating, a first holding, a second heating, a second holding, a first cooling, a second cooling, and a third cooling; the rate of the first heating is preferably 140~160℃ / h, more preferably 150℃ / h; the time of the first heating is preferably 6.5~7.5h, more preferably 7h; the final temperature of the first heating is preferably 1050℃; the time of the first holding is preferably 2~3h, more preferably 2.5h; the rate of the second heating is preferably 75~95℃ / h, more preferably 85℃ / h. The second heating time is preferably 2.5~3.5h, more preferably 3h; the final temperature of the second heating is preferably 1285℃; the second holding time is preferably 10~30min, more preferably 20min; the first cooling rate is preferably 95~105℃ / h, more preferably 100℃ / h; the final temperature of the first cooling is preferably 800℃; the second cooling rate is preferably 25~30℃ / h, more preferably 28℃ / h; the final temperature of the second cooling is preferably 400℃; the third cooling is preferably furnace cooling.

[0071] In this invention, the first heating is an oxidation firing stage (room temperature → 1050℃), ensuring sufficient oxidation and removing residual moisture and organic matter from the body and glaze; the first heat preservation is the heat preservation stage of oxidation firing; the second heating (1050℃ → 1250℃) is a reduction firing stage; the second heat preservation is the heat preservation stage of reduction firing, during which iron in both glazes is reduced to Fe. 2+ This is the critical period for the formation of cyan.

[0072] In this invention, both the first heating and the first heat preservation are preferably carried out in an oxidizing atmosphere. This invention does not impose any particular limitation on the oxidizing atmosphere; any oxidizing atmosphere well-known to those skilled in the art can be used.

[0073] In this invention, both the second heating and the second heat preservation are preferably carried out in a reducing atmosphere. This invention does not impose any particular limitation on the reducing atmosphere; any reducing atmosphere well-known to those skilled in the art can be used.

[0074] In this invention, the first cooling, the second cooling, and the third cooling are preferably all carried out in a neutral atmosphere. This invention does not specifically limit the type of neutral atmosphere; any neutral atmosphere well-known to those skilled in the art can be used.

[0075] In this invention, the total time for the first heating, the first holding, the second heating, and the second holding is preferably 10-15 hours. As one embodiment, the total time for the first heating, the first holding, the second heating, and the second holding can be 12.5 hours.

[0076] In this invention, the first cooling stage (1285℃→800℃) is a rapid cooling section, which helps to fix the liquid phase separation structure of the glaze and prevent excessive crystallization in the glaze layer; the second cooling stage (800℃→400℃) is a slow cooling / crack formation key stage, which is crucial for the formation of Ge ware plum green glaze (high coefficient of thermal expansion, approximately 8.2×10⁻⁶). -6 / K) and the Di kiln celadon glaze (lower coefficient of expansion, approximately 5.9×10) -6 / K) Due to the huge temperature difference and shrinkage difference, strong internal stress is generated, which leads to the main crack (secondary crack) extending directionally from the interface into the core period of the celadon glaze; slow cooling is a necessary condition to obtain clear, strong, and continuous linear cracks; the third cooling (400℃→room temperature) is the natural cooling stage.

[0077] The present invention does not have any special limitations on the operation of furnace cooling; any operation known to those skilled in the art can be used.

[0078] In this invention, the oxidation-reduction sintering is preferably carried out in a high-temperature gas furnace. This invention does not specify the type of high-temperature gas furnace; any instrument or equipment well-known to those skilled in the art can be used.

[0079] This invention, through the design of the body composition and the utilization of the glaze characteristics of Ge and Di kilns, actively controls the morphology, density, and spatial distribution of glaze crackle patterns to generate celadon products with a unique sense of layering, variations in density, and a growth-like visual artistic effect. This invention can actively design and generate celadon with layered, directional crackle patterns. Through a unique "body formula - double-layer glaze - local replacement" technical system, the crackle patterns grow on a fine and uniform base, forming continuous linear main crackles that conform to the shape, creating a new artistic effect of contrasting and coexisting "surface" and "line," "density" and "sparseness," and "stillness" and "movement."

[0080] This invention abandons the old approach of fine-tuning a single glaze formulation, instead seeking breakthroughs from the perspectives of more fundamental material interface mechanics and thermal stress engineering. The research and development path is established as follows: Innovative Principle: Drawing on the stress design concept of composite materials, a body-enamel system with a gradient of expansion coefficients is constructed to create a controllable interfacial stress source.

[0081] Material innovation: Returning to the local raw material system of Longquan, but carrying out functional restructuring and refining, developing low-expansion "base glaze" and high-expansion "stress source glaze" respectively.

[0082] Technological innovation: The "glazing" step is upgraded to "glaze patterning", combined with directional slow cooling technology to guide the stress release path.

[0083] The proposal of this invention is the culmination of this systematic research and development path. It marks a new direction in the study of Ge ware techniques, moving from the stage of "phenomenon reproduction" to "innovative crackle glaze."

[0084] The present invention also provides Longquan celadon prepared by the preparation method described in the above technical solution.

[0085] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0086] The sources of the raw materials used in the examples and comparative examples are as follows: The porcelain clay was produced at the Sangxiyang porcelain clay mining site in Linggen Village, Longquan City, Zhejiang Province. The purple clay originates from the Wuling porcelain clay mining site in Zhuyang Village, Baoxi Township, Longquan City, Zhejiang Province. The kaolin originates from the Xiyuan porcelain clay mining site in Yuandi Village, Longquan City, Zhejiang Province. The quartz was mined at Changgang Mining Site, Nanlong Village, Lanju Township, Longquan City, Zhejiang Province. The feldspar was mined at the Nanyuan mining site in Shangdun Village, Chatian Town, Longquan City, Zhejiang Province. The limestone was mined at Houzhuang Mining Site, Shenji Village, Daotai Township, Longquan City, Zhejiang Province. The wood ash was collected from Tangshang Collection Point, Yejiao Village, Badu Town, Longquan City, Zhejiang Province.

[0087] Example 1 A method for preparing Longquan celadon includes the following steps: (1) Clay preparation The basic clay for the Di kiln is obtained by mixing porcelain clay, quartz, feldspar, and purple clay. The raw materials of the Di kiln basic clay, by dry weight percentage, are: porcelain clay 50%, quartz 26%, feldspar 23%, and purple clay 1%. Ge kiln purple clay is obtained by mixing purple clay, kaolin, and quartz. The raw materials of Ge kiln purple clay, by dry weight percentage, are: purple clay 50%, kaolin 30%, and quartz 20%. The Ge kiln purple clay contains 7.5 wt% Fe₂O₃, 20 wt% Al₂O₃, and 1.0 wt% SiO₂. Take 80 parts of the foundation clay of the Di kiln and 20 parts of the purple gold clay of the Ge kiln (that is, the purple gold clay of the Ge kiln accounts for 20% of the total mass of the foundation clay of the Di kiln and the purple gold clay of the Ge kiln), add an appropriate amount of water and mix them by ball milling, then pass them through a 250-mesh sieve, adjust the moisture content to 24%, and age for 48 hours to obtain the clay material. (2) The clay is hand-thrown to form a green body, which is then air-dried at room temperature and then fired in a kiln at 920°C for 6 hours. The green body is then cooled in the kiln to obtain a bisque. (3) Weigh out kaolin, porcelain clay, limestone, purple clay and plant ash, mix them, add water and ball mill, pass through a 300-mesh sieve to obtain a glaze slurry with a Baume degree of 53°; use the immersion glazing method to immerse the unglazed body into the Di kiln celadon glaze slurry, the glazing time is 4 seconds, the glaze layer thickness is 0.7 mm, and after drying, the glazed body is obtained; wherein, the raw materials of the Di kiln celadon glaze slurry, by dry weight percentage, are: kaolin 30%, porcelain clay 23%, limestone 16.5%, purple clay 8.5% and plant ash 22%; (4) On the surface of the glazed body, according to the pre-designed lines (around the rim of the vessel), use a sharp glaze carving knife to remove the local area of ​​the Di kiln powder blue glaze layer, so that the removed area exposes the underlying unglazed body, forming a white pattern. Keep the removed edges clear and avoid burrs to obtain a glazed body with partially exposed unglazed body. (5) Weigh out purple clay, kaolin, limestone, quartz and feldspar, mix them and add water to ball mill, pass through a 300-mesh sieve to obtain a glaze slurry with a Baume degree of 48°; then use a brush to dip the glaze slurry to dot the glaze, and accurately fill the area of ​​the exposed bisque in step (4) so ​​that the glazed surface is flush with the surrounding Ge kiln glaze surface, and after drying, carry out oxidation-reduction firing to obtain Longquan celadon; among them, the raw materials of Ge kiln plum green crackle glaze slurry are as follows by dry material weight percentage: purple clay 5%, kaolin 20%, limestone 22%, quartz 23% and feldspar 30%; The redox firing process is as follows: The furnace was heated from room temperature to 1050°C at a rate of 160°C / h in an oxidizing atmosphere (excess air coefficient of 1.2, free oxygen content of 6% by volume) for a total time of 6.5 hours, and then held at 1050°C for 2 hours. Next, in a reducing atmosphere (excess air coefficient of 0.88, carbon monoxide content of 4% by volume, free oxygen content ≤0.2%), the furnace was heated from 1050°C to 1285°C at a rate of 95°C / h for a total time of 3.5 hours. It was then held at 1285°C for 30 minutes, after which the furnace was shut off and the furnace entered a cooling phase. Under a nitrogen atmosphere (nitrogen volume percentage ≥98%, free oxygen content ≤0.8%, carbon monoxide content ≤0.2%, no active oxidizing or reducing components), the furnace was cooled from 1285°C to 800°C at a rate of 95°C / h, and then from 800°C to 400°C at a rate of 30°C / h. Finally, the furnace was cooled to room temperature.

[0088] The actual image of the Longquan celadon prepared in Example 1 is shown below. Figure 1 As shown.

[0089] from Figure 1As can be seen, the Longquan celadon teacup produced in this embodiment has fine and uniform ice-crack-like cracks in the Ge kiln plum-green crackle glaze area below the cup, and several continuous long linear cracks grow from the edge of this area into the surrounding Di kiln powder-blue glaze. These cracks are abundant, and about 7 to 8 crack textures can be produced on a partially visible powder-blue glaze surface, forming a striking artistic effect of contrast between "dense" and "sparse", "dots" and "lines". The crack texture has obvious directionality and a sense of growth, which significantly enhances the visual layering and decorative expression of the object.

[0090] Example 2 A method for preparing Longquan celadon includes the following steps: (1) Clay preparation The basic clay for the Di kiln is obtained by mixing porcelain clay, quartz, feldspar, and purple clay. The raw materials of the Di kiln basic clay, by dry weight percentage, are: porcelain clay 42%, quartz 30%, feldspar 25%, and purple clay 3%. Ge kiln purple clay is obtained by uniformly mixing purple clay, kaolin, and quartz. The raw materials of Ge kiln purple clay, by dry weight percentage, are: purple clay 40%, kaolin 40%, and quartz 20%. The content of Fe2O3 in Ge kiln purple clay is 5.5wt%, Al2O3 25wt%, and SiO2 1.5wt%. Take 70 parts of the foundation clay of the Di kiln and 30 parts of the purple gold clay of the Ge kiln (that is, the purple gold clay of the Ge kiln accounts for 30% of the total mass of the foundation clay of the Di kiln and the purple gold clay of the Ge kiln), add an appropriate amount of water and mix them by ball milling, then pass them through a 250-mesh sieve, adjust the moisture content to 23%, and age for 48 hours to obtain the clay material. (2) The clay is hand-thrown to form a green body, which is then air-dried at room temperature and then fired in a kiln at 920°C for 6 hours. The green body is then cooled in the kiln to obtain a bisque. (3) Weigh out kaolin, porcelain clay, limestone, purple clay and plant ash, mix them, add water and ball mill, pass through a 300-mesh sieve to obtain a glaze slurry with a Baume degree of 53°; use the immersion glazing method to immerse the unglazed body into the Di kiln celadon glaze slurry, the glazing time is 4 seconds, the glaze layer thickness is 0.7 mm, and after drying, the glazed body is obtained; wherein, the raw materials of the Di kiln celadon glaze slurry, by dry weight percentage, are: kaolin 25%, porcelain clay 26%, limestone 15.5%, purple clay 9.5% and plant ash 24%; (4) On the surface of the glazed body, according to the pre-designed lines (decorated on the lower abdomen of the vessel), use a sharp glaze carving knife to remove the local Di kiln powder blue glaze layer, so that the removed area exposes the underlying unglazed body, forming a blank pattern. Keep the removed edges clear and avoid burrs to obtain a glazed body with partially exposed unglazed body. (5) Weigh out purple clay, kaolin, limestone, quartz and feldspar, mix them and add water to ball mill, pass through a 300-mesh sieve to obtain a glaze slurry with a Baume degree of 48°; then use a brush to dip the glaze slurry to dot the glaze, and accurately fill the area of ​​the exposed unglazed body in step (4) so ​​that the glazed surface is flush with the surrounding Ge kiln glaze surface, and after drying, carry out oxidation-reduction firing to obtain Longquan celadon; among them, the raw materials of Ge kiln plum green crackle glaze slurry are as follows by dry material weight percentage: purple clay 10%, kaolin 10%, limestone 25%, quartz 30% and feldspar 25%; The redox firing process is as follows: The furnace was heated from room temperature to 1050°C at a rate of 140°C / h in an oxidizing atmosphere (excess air coefficient of 1.3, free oxygen content of 7% by volume) for a total time of 7.5 hours; then held at 1050°C for 3 hours; then heated from 1050°C to 1285°C at a rate of 75°C / h in a reducing atmosphere (excess air coefficient of 0.91, carbon monoxide content of 5% by volume, free oxygen content ≤0.3%) for a total time of 3 hours; subsequently, the furnace was shut off and a cooling phase was initiated. The furnace was held at 1285°C for 10 minutes in a nitrogen atmosphere (nitrogen volume percentage ≥99%, free oxygen content ≤0.5%, carbon monoxide content ≤0.1%, no active oxidizing or reducing components), then cooled from 1285°C to 800°C at a rate of 105°C / h, then cooled from 800°C to 400°C at a rate of 25°C / h, and finally cooled to room temperature with the furnace.

[0091] The actual image of the Longquan celadon prepared in Example 2 is shown below. Figure 2 As shown.

[0092] from Figure 2 As can be seen, the Longquan celadon teacup produced in this embodiment exhibits fine and uniform ice-crack-like glaze in the Ge ware plum-green crackle glaze area below the cup, with several continuous long linear crackles growing from the edge of this area into the surrounding Di ware powder-blue glaze. These crackles are evenly distributed and well-spaced; approximately 5-6 crackle lines can be produced on a partially visible powder-blue glaze surface, creating a striking artistic effect of contrasting density and sparseness, dots and lines. The crackle texture has a clear directionality and sense of growth, significantly enhancing the visual depth and decorative expressiveness of the object.

[0093] Example 3 A method for preparing Longquan celadon includes the following steps: (1) Clay preparation The basic clay for the Di kiln is obtained by mixing porcelain clay, quartz, feldspar, and purple clay. The raw materials of the Di kiln basic clay, by dry weight percentage, are: porcelain clay 45%, quartz 25%, feldspar 28%, and purple clay 2%. Ge kiln purple clay is obtained by uniformly mixing purple clay, kaolin, and quartz. The raw materials of Ge kiln purple clay, by dry weight percentage, are: purple clay 45%, kaolin 35%, and quartz 20%. The Fe2O3 content in Ge kiln purple clay is 6.5wt%, Al2O3 content is 22wt%, and SiO2 content is 1.2wt%. Take 85 parts of the foundation clay of the Di kiln and 15 parts of the purple gold clay of the Ge kiln (that is, the purple gold clay of the Ge kiln accounts for 15% of the total mass of the foundation clay of the kiln and the purple gold clay of the Ge kiln), add an appropriate amount of water and mix them by ball milling, then pass them through a 250-mesh sieve, adjust the moisture content to 25%, and age for 48 hours to obtain the clay material. (2) The clay is hand-thrown to form a green body, which is then air-dried at room temperature and then fired in a kiln at 920°C for 6 hours. The green body is then cooled in the kiln to obtain a bisque. (3) Weigh out kaolin, porcelain clay, limestone, purple clay and plant ash, mix them, add water and ball mill, pass through a 300-mesh sieve to obtain a glaze slurry with a Baume degree of 53°; use the glazing method to immerse the unglazed body into the Di kiln celadon glaze slurry, the glazing time is 4 seconds, the glaze layer thickness is 0.7 mm, and after drying, the glazed body is obtained; wherein, the raw materials of the Di kiln celadon glaze slurry, by dry material mass percentage, are: kaolin 28%, porcelain clay 24%, limestone 16%, purple clay 9% and plant ash 23%; (4) On the surface of the glazed body, according to the pre-designed lines (decorated on the lower abdomen of the vessel), use a sharp glaze carving knife to remove the local Di kiln powder blue glaze layer, so that the removed area exposes the underlying unglazed body, forming a blank pattern. Keep the removed edges clear and avoid burrs to obtain a glazed body with partially exposed unglazed body. (5) Weigh out purple clay, kaolin, limestone, quartz and feldspar, mix them and add water to ball mill, pass through a 300-mesh sieve to obtain a glaze slurry with a Baume degree of 48°; then use a brush to dip the glaze slurry to dot the glaze, and accurately fill the area of ​​the exposed bisque in step (4) so ​​that the glazed surface is flush with the surrounding Ge kiln glaze surface. After drying, perform oxidation-reduction firing to obtain Longquan celadon; among them, the raw materials of Ge kiln plum green crackle glaze slurry are as follows by dry weight percentage: purple clay 6%, kaolin 19%, limestone 24%, quartz 23% and feldspar 28%; The redox firing process is as follows: The furnace was heated from room temperature to 1050°C at a rate of 150°C / h in an oxidizing atmosphere (excess air coefficient of 1.15, free oxygen content by volume of 5.5%) for a total time of 7 hours; then held at 1050°C for 2.5 hours; then heated from 1050°C to 1285°C at a rate of 85°C / h in a reducing atmosphere (excess air coefficient of 0.95, carbon monoxide content by volume of 6%, free oxygen content ≤0.4%) for a total time of 3 hours; then held at 1285°C for 20 minutes; then the furnace was shut off and the furnace entered the cooling stage. Under a nitrogen atmosphere (nitrogen volume percentage ≥98.5%, free oxygen content ≤0.6%, carbon monoxide content ≤0.15%, no active oxidizing or reducing components), the furnace was cooled from 1285°C to 800°C at a rate of 100°C / h, then cooled from 800°C to 400°C at a rate of 28°C / h, and finally cooled to room temperature with the furnace.

[0094] The actual image of the Longquan celadon prepared in Example 3 is shown below. Figure 3 As shown.

[0095] from Figure 3 As can be seen, the Longquan celadon teacup produced in this embodiment exhibits fine and uniform ice-crack-like glaze in the Ge ware plum-green crackle glaze area below the cup. Several continuous, long, linear crackles extend from the edge of this area into the surrounding Di ware powder-blue glaze. While the number of these crackles is relatively small, the effect is still aesthetically pleasing and complete. On a partially visible powder-blue glaze surface, approximately 2-3 crackle patterns can be produced, creating a striking artistic effect of contrasting density and sparseness, dots and lines. The crackle patterns possess a clear directionality and sense of growth, significantly enhancing the visual depth and decorative expressiveness of the object.

[0096] Comparative Example 1 This comparative study reduced the difference in the coefficient of expansion and stress storage capacity of the Ge ware glaze slurry, making it impossible for the crackling energy to be transferred to the Di ware glaze layer, thus preparing a celadon sample with sparse crackling, as detailed below: The dry weight percentage of the Ge kiln plum green crackle glaze slurry is as follows: purple clay 2%, kaolin 20%, limestone 22%, quartz 10%, feldspar 46%, and the rest is the same as in Example 1.

[0097] The actual image of the Longquan celadon prepared in Comparative Example 1 is shown below. Figure 4 As shown.

[0098] from Figure 4 It can be seen that the Longquan celadon teacup produced in this comparative example has weak overall cracking stress on the glaze surface, a small number of fine cracks in the Ge kiln crack area, no outward-extending linear cracks, and the overall crack density is the lowest among the three comparative examples, showing a large area of ​​white space on the powder blue glaze and sparse plum green crack patterns.

[0099] Comparative Example 2 This comparative example maintains a certain difference in expansion, but reduces the cohesion and stress continuity of the glaze layer, so that the stress is released randomly in localized areas, producing only a small amount of crazing texture, forming a gradient contrast, as shown below: The dry weight percentage of the Ge kiln plum green crackle glaze slurry is as follows: purple clay 8%, kaolin 22%, limestone 22%, quartz 18%, feldspar 30%, and the rest is the same as in Example 1.

[0100] The actual image of the Longquan celadon prepared in Comparative Example 2 is shown below. Figure 5 As shown.

[0101] from Figure 5 It can be seen that the Longquan celadon teacup prepared in this comparative proportion has a generally weak glaze structure stability and a weak overall cracking trend. Only 2 to 3 short, independent crack lines are generated in the Ge kiln glaze filling area. There are no long lines extending, no intersecting textures, and no outward-growing derivative cracks. The glaze cracking effect is incomplete.

[0102] Comparative Example 3 This comparative example allows for the initial release of stress, but the energy is insufficient, resulting in only short-lived, low-energy linear cracks. This leads to soft crack lines with no extension or growth potential, as detailed below: The dry weight percentage of the Ge kiln plum-green crackle glaze slurry is as follows: 4% purple clay, 22% kaolin, 22% limestone, 22% quartz, and 30% feldspar. The other components are the same as in Example 1.

[0103] The actual image of the Longquan celadon prepared in Comparative Example 3 is shown below. Figure 6 As shown.

[0104] from Figure 6 It can be seen that the Longquan celadon teacup prepared in this comparative proportion can generate about 5 crackle patterns on the glaze surface. The number of crackle patterns is moderate. However, due to the incomplete release of internal stress in the glaze layer, the lines are thin and soft, with poor three-dimensionality and insufficient tension. There is no tendency to extend outward or continue to grow, and no long crackle patterns are generated. The texture is fixed and unchanging.

[0105] As can be seen from the above embodiments and comparative examples, the preparation method provided by the present invention grows continuous linear main cracks that fit the shape on a fine and uniform substrate, forming a new artistic effect of contrast and coexistence of "surface" and "line", "dense" and "sparse", "still" and "moving", and can achieve layered and directional crack textures.

[0106] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing Longquan celadon, comprising the following steps: (1) The foundation clay of the Di kiln, the purple gold clay of the Ge kiln, and an inorganic solvent are mixed to obtain clay material; the raw materials of the foundation clay of the Di kiln include, by mass percentage of dry material: The composition consists of 42-50% kaolin, 22-30% quartz, 20-25% feldspar, and 1-3% purple clay. The raw materials for Ge ware purple clay, by dry weight percentage, include: purple clay 40-50%, kaolin 30-40%, and quartz 10-20%. (2) The clay obtained in step (1) is successively shaped and bisque-fired to obtain a bisque blank; (3) Apply glaze to the surface of the unglazed body obtained in step (2) using the Di kiln celadon glaze slurry to obtain a glazed body; the raw materials of the Di kiln celadon glaze slurry include, by dry weight percentage: 25-30% kaolin, 23-26% porcelain clay, 15.5-16.5% limestone, 8.5-9.5% purple clay and 22-24% wood ash; (4) The surface of the glazed blank obtained in step (3) is partially removed to obtain a glazed blank with partially exposed unglazed blank; (5) The Ge kiln plum green crackle glaze slurry is used to fill the exposed bisque part of the glaze blank obtained in step (4), and then the oxidation-reduction firing is carried out to obtain Longquan celadon; the raw materials of the Ge kiln plum green crackle glaze slurry include, by dry weight percentage: 5-10% purple clay, 10-20% kaolin, 22-25% limestone, 20-30% quartz and 15-30% feldspar.

2. The preparation method according to claim 1, characterized in that, In step (1), the mass of Ge kiln purple clay is 15-30% of the total mass of Di kiln foundation clay and Ge kiln purple clay.

3. The preparation method according to claim 1, characterized in that, In step (1), the content of Fe2O3 in Ge kiln purple clay is 5.5~7.5wt%, the content of Al2O3 is 20~25wt%, and the content of SiO2 is 1.0~1.5wt%.

4. The preparation method according to claim 1, characterized in that, The raw materials for the Diyao powder blue glaze slurry in step (3) include, by dry weight percentage: 26-29% kaolin, 24-25% porcelain clay, 15.8-16.2% limestone, 8.8-9.2% purple clay and 23-24% wood ash.

5. The preparation method according to claim 1, characterized in that, In step (5), the raw materials of the Ge kiln plum green crackle glaze paste, by dry weight percentage, include: 6-9% purple clay, 12-18% kaolin, 23-24% limestone, 22-28% quartz, and 20-25% feldspar.

6. The preparation method according to claim 1, characterized in that, The oxidation-reduction calcination in step (5) includes sequentially performing a first heating, a first holding, a second heating, a second holding, a first cooling, a second cooling, and a third cooling; the first heating rate is 140~160℃ / h, the first heating time is 6.5~7.5h, and the final temperature of the first heating is 1050℃; the first holding time is 2~3h; the second heating rate is 75~95℃ / h, the second heating time is 2.5~3.5h, and the final temperature of the second heating is 1285℃; the second holding time is 10~30min; the first cooling rate is 95~105℃ / h, and the final temperature of the first cooling is 800℃; the second cooling rate is 25~30℃ / h, and the final temperature of the second cooling is 400℃; the third cooling is furnace cooling.

7. The preparation method according to claim 6, characterized in that, The first heating and the first holding were both carried out in an oxidizing atmosphere.

8. The preparation method according to claim 6, characterized in that, The second heating and the second holding were both carried out in a reducing atmosphere.

9. The preparation method according to claim 1, characterized in that, The total time for the first heating, the first holding, the second heating, and the second holding is 10-15 hours.

10. Longquan celadon prepared by the preparation method according to any one of claims 1 to 9.

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