KR102656941B1 - Manufacturing method of green-glazed ceramicware - Google Patents

Abstract

The present invention includes the steps of first firing and processing an earthen dough molding product formed into a certain shape; A first step of applying a first glaze mixture containing iron oxide to the surface of the first fired clay dough molding product; A second application of a second glaze mixture containing copper carbonate to the surface of the first application of the clay molding product; A third application of a third glaze mixture containing weak soil on the surface of the second application of the clay dough molding product; It relates to a method of manufacturing pottery including the step of processing the third-applied clay dough molding product by second firing, wherein the pattern implemented on the pottery remains clearly for a long time and does not discolor, and the surface of the pottery is not damaged at all by ultraviolet rays, etc. Cracks do not occur, the ceramics are durable enough to not break easily even under external impact, the surface is not easily scratched by sharp objects, etc., and it has very strong resistance to acids or bases. It relates to a method of manufacturing pottery that makes it easy to form gradients or various beautiful patterns while controlling the amount.

Description

Ceramic manufacturing method {MANUFACTURING METHOD OF GREEN-GLAZED CERAMICWARE}

The present invention relates to a method of manufacturing ceramics, and more specifically, the patterns implemented on the ceramics remain clearly for a long time and do not discolor, the surface of the ceramics does not crack at all due to ultraviolet rays, etc., and the ceramics are durable so that they are not easily broken even by external impacts. The surface is not easily scratched by sharp objects, has very strong resistance to acids or bases, and makes it easy to form gradients or various beautiful patterns by controlling the amount of sprayed liquid through spraying. It is about the method of making pottery.

Ceramics refers to various crafts made by firing clay molds at high temperatures. In particular, pottery can express various patterns and colors on the surface using clay called encrymation, and is used to process the surface of pottery to be clear and transparent. Various glazes are used.

Meanwhile, green-glazed ceramicware refers to ceramics that use copper components to develop green and blue colors on the surface to form various patterns.

Meanwhile, Patent Document 1 below discloses a method of manufacturing green glazed ceramics in which a large number of air bubbles are uniformly distributed in the glaze layer, but this manufacturing method had limitations such as difficulty in forming various patterns and insufficient durability. .

Therefore, the patterns implemented on the ceramics remain clearly for a long time and do not discolor, the surface of the ceramics does not crack at all due to ultraviolet rays, etc., and the ceramics are durable enough to not easily break even when exposed to external shock, and are not easily damaged by sharp objects. There is an urgent need for the development of a ceramic manufacturing method that does not cause scratches, has strong resistance to acids or bases, and makes it easy to form gradients or various beautiful patterns on the surface.

Patent Document 1: Korean Patent No. 10-1913594 (2018.10.31)

The purpose of the present invention is to ensure that patterns implemented on ceramics remain clearly for a long time and do not discolor, that the surface of the ceramics does not crack at all due to ultraviolet rays, etc., that the ceramics are durable enough to not easily break even when subjected to external impacts, and that the ceramics are not easily damaged by sharp objects, etc. The aim is to provide a method of manufacturing ceramics that does not easily scratch the surface, has strong resistance to acids or bases, and makes it easy to form gradients or various beautiful patterns on the surface.

A method of manufacturing pottery according to an embodiment of the present invention includes the steps of first firing and processing an earthen dough molding product formed into a certain shape; A first step of applying a first glaze mixture containing iron oxide to the surface of the first fired clay dough molding product; A second application of a second glaze mixture containing copper carbonate to the surface of the first application of the clay molding product; A third application of a third glaze mixture containing weak soil on the surface of the second application of the clay dough molding product; And a step of processing the thirdly applied clay dough molding product by second firing.

In the ceramic manufacturing method according to one embodiment of the present invention, the first glaze mixture is characterized in that it contains iron oxide, manganese, barium carbonate, feldspar, silica, limestone, kaolin, and water.

In the ceramic manufacturing method according to one embodiment of the present invention, the second glaze mixture includes copper carbonate, tin oxide, bone ash, zinc oxide, barium carbonate, feldspar, quartzite, marble, kaolin, and water.

In the ceramic manufacturing method according to one embodiment of the present invention, the third glaze mixture is characterized in that it contains feldspar, silica, limestone, medicinal clay, oak ash, barium carbonate, and water.
The method of manufacturing ceramics according to the present invention includes a first firing step of first firing and processing an earthen dough molding product formed into a certain shape; A first application step of first applying a first glaze mixture containing iron oxide to the surface of the first fired clay dough molding product; After the first application step, a second application step of applying a second glaze mixture containing copper carbonate to the surface of the first application of the clay dough molding product; After the second application step, a third application step of applying a third glaze mixture containing weak soil to the surface of the second application soil dough molding device; And a second firing step of processing the thirdly applied clay dough molding product by second firing, wherein the first glaze mixture contains iron oxide, manganese, barium carbonate, feldspar, silica, limestone, kaolin, and water. , The second glaze mixture contains copper carbonate, tin oxide, bone ash, zinc oxide, barium carbonate, feldspar, quartzite, marble, kaolin and water, and the third glaze mixture contains feldspar, silica, limestone, clay, oak ash, It is characterized in that it contains barium carbonate and water.

The method of manufacturing pottery according to the present invention maintains the pattern implemented on the pottery clearly for a long time and does not discolor, the surface of the pottery does not crack at all due to ultraviolet rays, etc., the pottery is durable and does not break easily even when exposed to external shock, and the ceramic has a sharp edge. The surface is not easily scratched by objects, etc., has very strong resistance to acids or bases, and has the advantage of being easy to form gradients or various beautiful patterns by controlling the amount of sprayed liquid through spraying.

Figure 1 is a diagram showing a schematic process diagram of the ceramic manufacturing method according to the present invention.
Figures 2 and 3 are example photos of ceramics with various patterns manufactured according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Figure 1 is a diagram showing a schematic process diagram of the method for manufacturing ceramics according to the present invention, and Figures 2 and 3 are exemplary photographs of ceramics with various patterns manufactured according to the present invention.

Hereinafter, the ceramic manufacturing method according to the present invention will be described in detail with reference to the attached FIGS. 1 to 3.

The present invention relates to a method of manufacturing ceramics, and more specifically, the patterns implemented on the ceramics remain clearly for a long time and do not discolor, the surface of the ceramics does not crack at all due to ultraviolet rays, etc., and the ceramics are durable so that they are not easily broken even by external impacts. The surface is not easily scratched by sharp objects, has very strong resistance to acids or bases, and makes it easy to form gradients or various beautiful patterns by controlling the amount of sprayed liquid through spraying. It is about the method of making pottery.

Ceramics (ceramicware) refers to "pottery", which refers to clay sculptures (objects) of various shapes made using clay paste mixed with fine earth and water and baked at approximately 800 to 1,000℃, and clay paste sculptures are approx. It is a compound word of “porcelain,” which means baked at 1,100 to 1,400°C. It is a molded object that is shaped into a certain shape by kneading fine clay by hand or using a vacuum kneader, shaping it using a pottery wheel, etc., and then cutting it. It refers to various crafts made by treating the surface with various glazes and baking at a high temperature of over 1,200℃.

In particular, pottery can express various patterns and colors on its surface using clay called cremation, for example, inlay technique, printing technique, artificial flower technique, foil technique, gwiyal technique, deombeong technique, iron painting technique, bluing technique, It is possible to form various and beautiful patterns on the surface using techniques such as black porcelain technique and cinnabar technique.

Meanwhile, various glazes are used to make the surface of ceramics clear and transparent. In other words, glaze refers to a glassy lye mixture of silicates that is applied thinly to the surface when manufacturing pottery and then melts and sticks to the surface of the pottery when fired at high temperature. Depending on the type of pottery, it is called pottery oil. It can be divided into metal oil, stoneware oil, and porcelain oil. Pottery oil melts around 1,100℃, stoneware oil melts around 1,200 to 1,300℃, and porcelain oil melts around 1,300℃, depending on the raw materials used. It is divided into feldspar oil, alkaline oil, lime oil, salt oil, condensed oil, zinc oil, etc., and white oil depending on the appearance condition. , colored oil, celadon oil, glass oil, black oil, transparent oil, opaque oil, matte oil. It is also divided into crystalline oil, cracked oil, etc.

Such a glaze should have a coefficient of thermal expansion approximately equal to that of the base material of the ceramics, but its melting point should be lower than that of the base material of the ceramics. The main component of these glazes is a silicate compound, and the glazes used for ceramics fired at high temperatures (1,200 to 1,500°C), such as porcelain, typically include feldspar, quartz, limestone, kaolin, etc., and, like pottery, are fired at low temperatures (960 to 1,000°C). Glazes used for pottery fired at ℃) typically include kaolin, borax, feldspar, limestone, etc. Meanwhile, metal components such as iron, copper, cobalt, etc. are sometimes mixed into these glazes to add color.

Meanwhile, green-glazed ceramicware refers to ceramics that use copper components to develop green and blue colors on the surface to form various patterns.

The present inventor, who is Korean Master No. 17-512 of the Republic of Korea and the grand prize winner of the Korea International Art Competition (G20 Seoul Summit Special Exhibition), serves as a judge/chief judge for various ceramics-related skills competitions and international general art competitions. Through many years of ceramic art creation activities and research on various ceramics production, we have discovered that the patterns implemented on the ceramics remain clearly for a long time and do not discolor, the surface of the ceramics does not crack at all due to ultraviolet rays, etc., and the ceramics do not easily break even when subjected to external impacts. It is durable, does not scratch the surface easily due to sharp objects, has very strong resistance to various acids or bases, and can form gradients or various beautiful patterns by controlling the amount of sprayed liquid through the spray technique. An easy pottery manufacturing method was developed.

A method of manufacturing pottery according to an embodiment of the present invention includes the steps of first firing and processing an earthen dough molding product formed into a certain shape; A first step of applying a first glaze mixture containing iron oxide to the surface of the first fired clay dough molding product; A second application of a second glaze mixture containing copper carbonate to the surface of the first application of the clay molding product; A third application of a third glaze mixture containing weak soil on the surface of the second application of the clay dough molding product; And a step of processing the thirdly applied clay dough molding product by second firing.

As such, the method of manufacturing pottery according to the present invention involves glazing (= deombeongsi glazing) a specific part (front or body) of the first fired molded object by immersing it in a first glaze mixture that can exhibit a warm brown color. After the first application, the second application process is carried out by spraying a second glaze mixture that can immediately display a green or blue color without a separate drying process, forming various green patterns and creating a gradation in the desired area. It is possible to easily form a glaze, and immediately after this 2nd application process, the entire molded object that has progressed to the 2nd application process is completely immersed in the third glaze mixture without any separate drying process. It has a technical feature in that it is possible to form beautiful green oil crystals by placing the cleaned part on the bottom, placing it in a high-temperature calciner (kiln), and performing a secondary firing process.

The clay dough molding device is made by kneading the clay (for example, white clay) used in the manufacture of pottery with water, repeatedly adding and removing it from a vacuum clay pot, etc., and cutting the lump of clay dough that has been sufficiently kneaded into a certain size. After placing it on the potter's wheel, while rotating the potter's wheel, it is molded into the desired shape using hands or tools, and then shaped into various shapes of household pottery such as tea bowls, jars, plates, vases, etc., or ornaments of various shapes. In this way, when a molded article with a certain shape is made, it is dried by natural drying at room temperature for about 1 to 2 days, and the molded article that has been dried to some extent is placed on the potter's wheel again and rotated, and the bottom of the molded article ( Heel cutting is performed to cut the heel into a certain shape. Meanwhile, once the heel cutting is completed in this way, it goes through a drying process again at room temperature in the drying room for 2 to 3 days.

Meanwhile, the molded object prepared according to this conventional method is completed into ceramics through the process described later.

First, the molded article prepared through the above process is placed in a firing furnace (kiln) and the first firing is performed while slowly raising the temperature to 850 to 950°C.

In this first firing, the temperature is raised to the maximum temperature of 850 to 950 ℃ for approximately 12 hours, and the fuel input to the kiln is stopped immediately after the temperature is raised to the maximum temperature, and the kiln is heated for about 1 to 200 ℃ until the temperature of the kiln reaches approximately 200 ℃. A gradual cooling process is carried out over 2 days.

On the other hand, when the kiln cools down to a temperature of about 200℃, the kiln door is opened, and 2 to 3 hours after opening the kiln door, the temperature reaches a level where the first fired molded article can be taken out of the kiln. It cools down, and when the first fired molding product is cooled, it is taken out and a triple coating operation described later is performed.

The method of manufacturing ceramics according to the present invention has a technical feature in that it performs a triple coating operation, which will be described later.

The triple trial proceeds in the following order.

First, the first glazing step is performed on the molded product that has been first fired in the same manner as described above with the first glaze mixture containing iron oxide.

This first glazing process is carried out using a first glaze mixture in which iron oxide, manganese, barium carbonate, feldspar, silica, limestone, kaolin and water are evenly mixed, and the desired part of the molded object (for example, the mouth in the case of a teacup) is used. So that the first glaze mixture is evenly applied to the surface of the corresponding part of the first fired molded article through the process of dipping the touching part (the "front" part or the body part corresponding to the belly) in the first glaze mixture and then taking it out. do.

In this way, the first glazing process using the first glaze mixture can be carried out through the entire glazing process, which is performed by immersing the entire first fired molding object in a container containing the first glaze mixture and then taking it out.

For example, the first glaze mixture is 100 kg of water, 5 to 15 kg of iron oxide (Fe ₂ O ₃ ) powder, preferably 10 kg, 3 to 10 kg of manganese (Mn) powder, preferably 5 kg, and carbonic acid. Barium (BaCO ₃ ) 5 to 15 kg, preferably 10 kg, feldspar powder 30 to 40 kg, preferably 36 kg, silica powder 10 to 20 kg, preferably 15 kg, limestone 10 to 20 kg, preferably It is prepared by adding 14 kg of kaolin powder, 5 to 15 kg, preferably 10 kg, and mixing evenly using a mixer, etc.

The iron oxide contained in the first glaze mixture helps create a brown-based color, and the manganese serves to prevent the iron oxide contained in the first glaze mixture from volatilizing and disappearing during the firing process. Meanwhile, the barium carbonate and kaolin serve as a solvent to help the various components contained in the first glaze mixture to be evenly mixed, and the feldspar, silica, and limestone are used to give the first glaze mixture a clear and transparent feel. performs its role. Meanwhile, the kaolin acts as a flux as described above, and at the same time helps to make the brown color of iron oxide deeper and heavier.

On the other hand, since the internal moisture of the first fired molded article has been almost removed, the first glaze mixture applied to the surface through the first application is quickly absorbed into the inside through the surface of the molded article, and the second glaze mixture described later is absorbed into the molded article. No separate drying process is required for application.

Next, a second application process is performed by spraying a second glaze mixture containing copper carbonate on the desired surface of the molded article on which the first application process was performed.

On the other hand, the process of secondary application using the second glaze mixture is carried out by spraying the area requiring secondary application as described above, but also by partially pouring only that part into a container containing the second glaze mixture. It is also possible to proceed through the partial deombeongsiyu process, which is a method of soaking and then taking out.

The second glaze mixture used in the second glaze is prepared by evenly mixing copper carbonate, tin oxide, bone ash, zinc oxide, barium carbonate, feldspar, quartzite, marble, kaolin, and water.

Such a second glaze mixture is, for example, 1 to 5 kg of copper carbonate (Cu(CO ₃ )) powder, preferably 3 kg, and 1 to 5 kg of tin oxide (SnO ₂ ) powder to 105 kg of water, preferably. 3 kg, bone ash powder 0.5 to 2 kg, preferably 1 kg, zinc oxide (zinc oxide, ZnO) powder 0.5 to 2 kg, preferably 1 kg, barium carbonate powder 5 to 10 kg, preferably 6 kg, feldspar powder 40 to 50 kg, preferably 45 kg, silica powder 20 to 30 kg, preferably 26 kg, marble powder 15 to 25 kg, preferably 18 kg, kaolin powder 1 to 3 kg, preferably It is prepared by adding 2 kg and mixing evenly using a mixer.

The bone ash is manufactured by calcining and pulverizing animal bones at high temperature. In the present invention, bovine bones are boiled in water to remove fat, then roasted in a kiln heated to about 1,000°C, and then powdered. used. It is also possible to purchase and use bone hoe distributed by “Daewondojae” located in Icheon-si, Gyeonggi-do.

The copper carbonate and tin oxide contained in the second glaze mixture help to express green and blue colors, and the bone ash plays a role in improving the strength of the surface of the ceramics being manufactured, and the zincate, barium carbonate, and marble And kaolin plays a role as a flux that helps the various components included in the second glaze mixture to be evenly mixed, and the feldspar and quartzite can play a role in giving the second glaze mixture a clear and transparent feel.

Meanwhile, it is possible to form various patterns by putting the second glaze mixture prepared in this way into a spray gun and spraying it at various thicknesses on various areas.

In particular, during the spraying process, it is possible to very easily achieve desired shapes and beautiful gradations by controlling the spray amount, spray area, and spray moving speed.

On the other hand, since such spray injection controls the amount sprayed and drying occurs simultaneously during the spraying process, once the second application through this spray injection is completed, it is possible to immediately perform the third application described later without a separate drying process. It becomes.

The third coating is performed on the molding product that has been subjected to the second coating using a third glaze mixture containing medicinal soil and oak ash.

The third glaze mixture used in this third application is prepared by evenly mixing feldspar, silica, limestone, clay, oak ash, barium carbonate, and water.

Such a third glaze mixture is, for example, 130 kg of water, 10 to 15 kg of feldspar powder, preferably 12.5 kg, 5 to 15 kg of silica powder, preferably 10 kg, and 20 to 25 kg of limestone powder, preferably. Add 22.5 kg, 70 to 80 kg, preferably 75 kg of medicinal soil powder, 3 to 10 kg of oak ash, preferably 6 kg, and 2 to 10 kg of barium carbonate, preferably 4 kg, and mix evenly using a mixer, etc. Prepare through the process.

Meanwhile, the feldspar, silica, and limestone included in the third glaze mixture help give the third glaze mixture a clear and transparent feel, and the weak clay helps the third-glazed pottery achieve a warm ivory color. In addition, the oak ash and barium carbonate can serve as a solvent to help the various components contained in the third glaze mixture to be evenly mixed.

Yakto (藥土) included in the third glaze mixture is a material usually mixed with glaze used in pottery crafts, and refers to soil that has rotted due to leaves or grass roots accumulated over a long period of time in a mountain with many pine trees.

The present inventor purchased medicinal soil distributed from “Cheongha Dojae” located in Hyeonam-ri, Yeoju-eup, Yeoju-gun, Gyeonggi-do, and used it in the ceramic manufacturing method of the present invention.

Meanwhile, a process of processing the clay dough molding product that has gone through the first application, second application, and third application processes through the above-described process is performed by second firing.

This secondary firing process is carried out in a firing furnace maintaining a temperature of 1,280 to 1,300°C. In this way, the molded article that has undergone triple casting through the first, second, and third trials is subjected to secondary firing. Through the process of melting and mixing the ingredients contained in each glaze mixture, it is possible to form beautiful crystals of various green glazes.

Hereinafter, various examples and comparative examples will be described that can confirm the excellent effects of the ceramic manufacturing method according to the present invention.

[Molding product manufacturing example 1] - Preparation of white clay molding device

After putting the kneaded white clay in a vacuum and kneading it sufficiently, 100 disk-shaped clay molding objects with a diameter of 30 cm and a thickness of 1.5 cm and a bottom heel formed at the bottom for mounting in a kiln were molded. These molding objects were 48. An earthen dough molding device for testing was prepared by naturally drying it in a ventilated shade while maintaining a temperature of 25°C for a period of time.

[Molded article manufacturing example 2] - Molded article first firing process

The molded article manufactured in Example 1 of Molding Product Manufacturing Example 1 was placed in a kiln for primary firing, and the first firing process was performed for 6 hours while maintaining the temperature of the kiln at 900°C. After 6 hours, the first firing kiln was Heating was stopped and maintained for 48 hours to gradually cool the molded product. Afterwards, the door of the first firing kiln was opened, and after 3 hours, the first fired molding product was taken out.

[Glaze Preparation Example 1] - Preparation of the first glaze mixture for primary coating

In 100 kg of water, 10 kg of iron oxide (Fe ₂ O ₃ ) powder with a particle size of 2 ㎛, 5 kg of manganese (Mn) powder with a particle size of 2 ㎛, 10 kg of barium carbonate (BaCO ₃ ) powder with a particle size of 2 ㎛, and feldspar with a particle size of 2 ㎛. 36kg of powder, 15kg of silica powder with a particle size of 2㎛, 14kg of limestone powder with a particle size of 2㎛, and 10kg of kaolin powder with a particle size of 2㎛ were added and mixed evenly using a mixer to prepare the first glaze mixture.

[Glaze Preparation Example 2] - Preparation of second glaze mixture for secondary coating

In 105 kg of water, 3 kg of copper carbonate (Cu(CO ₃ )) powder with a particle size of 2 ㎛, 3 kg of tin oxide (SnO ₂ ) powder with a particle size of 2 ㎛, and 1 kg of bone ash powder with a particle size of 2 ㎛, particle size 2 1 kg of zinc oxide (zinc oxide, ZnO) powder with a particle size of 2 μm, 6 kg of barium carbonate powder with a particle size of 2 μm, 45 kg of feldspar powder with a particle size of 2 μm, 26 kg of silica powder with a particle size of 2 μm, 18 kg of marble powder with a particle size of 2 μm, and 2 kg of kaolin powder with a particle size of 2㎛ was added and mixed evenly using a mixer to prepare a second glaze mixture.

[Glaze Preparation Example 3] - Preparation of third glaze mixture for tertiary coating

In 130 kg of water, 12.5 kg of feldspar powder with a particle size of 2 ㎛, 10 kg of silica powder with a particle size of 2 ㎛, 22.5 kg of limestone powder with a particle size of 2 ㎛, 75 kg of clay powder with a particle size of 2 ㎛, and 6 kg of oak ash with a particle size of 2 ㎛. 4 kg of barium carbonate (2㎛) was added and mixed evenly using a mixer to prepare the third glaze mixture.

[Glaze Preparation Example 4] - Fourth glaze mixture (1st glaze mixture + 2nd glaze mixture)

In 205 kg of water, 10 kg of iron oxide (Fe ₂ O ₃ ) powder with a particle size of 2 ㎛, 5 kg of manganese (Mn) powder with a particle size of 2 ㎛, 10 kg of barium carbonate (BaCO ₃ ) powder with a particle size of 2 ㎛, and feldspar with a particle size of 2 ㎛. 36kg of powder, 15kg of silica powder with a particle size of 2㎛, 14kg of limestone powder with a particle size of 2㎛, 10kg of kaolin powder with a particle size of 2㎛, 3kg of copper carbonate (Cu(CO ₃ )) powder with a particle size of 2㎛, particle size of 2 3 kg of tin oxide (SnO ₂ ) powder with a particle size of 2 ㎛, 1 kg of bone ash powder with a particle size of 2 ㎛, 1 kg of zinc oxide (ZnO) powder with a particle size of 2 ㎛, 6 kg of barium carbonate powder with a particle size of 2 ㎛, Add 45kg of feldspar powder with a particle size of 2㎛, 26kg of silica powder with a particle size of 2㎛, 18kg of marble powder with a particle size of 2㎛, and 2kg of kaolin powder with a particle size of 2㎛ and mix evenly using a mixer to prepare the fourth glaze mixture. did.

[Glaze Preparation Example 5] - Fifth glaze mixture (1st glaze mixture + 3rd glaze mixture)

In 230 kg of water, 10 kg of iron oxide (Fe ₂ O ₃ ) powder with a particle size of 2 ㎛, 5 kg of manganese (Mn) powder with a particle size of 2 ㎛, 10 kg of barium carbonate (BaCO ₃ ) powder with a particle size of 2 ㎛, and feldspar with a particle size of 2 ㎛. 36kg of powder, 15kg of silica powder with a particle size of 2㎛, 14kg of limestone powder with a particle size of 2㎛, 10kg of kaolin powder with a particle size of 2㎛, 12.5kg of feldspar powder with a particle size of 2㎛, 10kg of silica powder with a particle size of 2㎛, particle size 22.5 kg of limestone powder with a particle size of 2 μm, 75 kg of clay powder with a particle size of 2 μm, 6 kg of oak ash with a particle size of 2 μm, and 4 kg of barium carbonate with a particle size of 2 μm were added and mixed evenly using a mixer to prepare the fifth glaze mixture. .

[Glaze Manufacturing Example 6] - 6th glaze mixture (2nd glaze mixture + 3rd glaze mixture)

In 235 kg of water, 3 kg of copper carbonate (Cu(CO ₃ )) powder with a particle size of 2 ㎛, 3 kg of tin oxide (SnO ₂ ) powder with a particle size of 2 ㎛, and 1 kg of bone ash powder with a particle size of 2 ㎛, particle size 2 1kg of ㎛ zinc oxide (zinc oxide, ZnO) powder, 6kg of barium carbonate powder with a particle size of 2㎛, 45kg of feldspar powder with a particle size of 2㎛, 26kg of silica powder with a particle size of 2㎛, 18kg of marble powder with a particle size of 2㎛, 2kg of kaolin powder with a particle size of 2㎛, 12.5kg of feldspar powder with a particle size of 2㎛, 10kg of silica powder with a particle size of 2㎛, 22.5kg of limestone powder with a particle size of 2㎛, 75kg of medicinal clay powder with a particle size of 2㎛, oak tree with a particle size of 2㎛ 6 kg of ash and 4 kg of barium carbonate with a particle size of 2㎛ were added and mixed evenly using a mixer to prepare the sixth glaze mixture.

[Glaze Preparation Example 7] - 7th glaze mixture (1st glaze mixture + 2nd glaze mixture + 3rd glaze mixture)

In 335 kg of water, 10 kg of iron oxide (Fe ₂ O ₃ ) powder with a particle size of 2 ㎛, 5 kg of manganese (Mn) powder with a particle size of 2 ㎛, 10 kg of barium carbonate (BaCO ₃ ) powder with a particle size of 2 ㎛, and feldspar with a particle size of 2 ㎛. 36kg of powder, 15kg of silica powder with a particle size of 2㎛, 14kg of limestone powder with a particle size of 2㎛, 10kg of kaolin powder with a particle size of 2㎛, 3kg of copper carbonate (Cu(CO ₃ )) powder with a particle size of 2㎛, particle size of 2 3 kg of tin oxide (SnO ₂ ) powder with a particle size of 2 ㎛, 1 kg of bone ash powder with a particle size of 2 ㎛, 1 kg of zinc oxide (ZnO) powder with a particle size of 2 ㎛, 6 kg of barium carbonate powder with a particle size of 2 ㎛, 45kg of feldspar powder with a particle size of 2㎛, 26kg of silica powder with a particle size of 2㎛, 18kg of marble powder with a particle size of 2㎛, 2kg of kaolin powder with a particle size of 2㎛, 12.5kg of feldspar powder with a particle size of 2㎛, quartzite with a particle size of 2㎛ Add 10 kg of powder, 22.5 kg of limestone powder with a particle size of 2 ㎛, 75 kg of clay powder with a particle size of 2 ㎛, 6 kg of oak ash with a particle size of 2 ㎛, and 4 kg of barium carbonate with a particle size of 2 ㎛ and mix evenly using a mixer. A glaze mixture was prepared.

[Example 1] - Proceed with the first, second and third glaze mixtures sequentially (Dumbeong + Spray + Dump)

The first glazing was performed on the entire surface of the molded object through the process of dipping the entire molded object that had completed the first firing process through the molded object manufacturing example 2 into a container containing the first glaze mixture prepared through the glaze manufacturing example 1. did. Afterwards, without going through a separate drying process on the surface of the first coated molded object, 10 g of the second glaze mixture prepared through Glaze Preparation Example 2 is immediately sprayed on the entire surface of the first coated molded object to perform a second coat. was performed, and immediately after such spraying, without going through a separate drying process, the entire surface of the molded object was subjected to a third application through the process of dipping the entire product into a container containing the third glaze mixture prepared through the above glaze preparation example 3. The process proceeded. Afterwards, the glaze on the bottom heel of the molded product that had progressed to the third firing was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, 2 The heating of the tea firing kiln was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Example 2] - Proceed with the first, second and third glaze mixtures sequentially (Deombeong + Deombeong + Deombeong)

The first glazing was performed on the entire surface of the molded object through the process of dipping the entire molded object that had completed the first firing process through the molded object manufacturing example 2 into a container containing the first glaze mixture prepared through the glaze manufacturing example 1. did. Afterwards, without going through a separate drying process on the surface of the molded object that was first coated, a secondary coating was applied to the entire surface of the molded object through the process of dipping the entire thing into a container containing the second glaze mixture prepared through the above glaze preparation example 2. Testing was performed. Afterwards, without going through a separate drying process, a third coating process was carried out on the entire surface of the molded object by directly immersing the entire product in a container containing the third glaze mixture prepared through Glaze Preparation Example 3. Afterwards, the glaze on the bottom heel of the molded product that had progressed to the third firing was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, 2 The heating of the tea firing kiln was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 1] - First glaze mixture + Deombeongsi oil

The entire surface of the molded object was glazed through the process of dipping the molded object that had completed the first firing process through Manufacturing Example 2 into a container containing the first glaze mixture prepared through Glaze Manufacturing Example 1. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 2] - First glaze mixture + spray oil

Applying 10 g of the first glaze mixture prepared in Glaze Preparation Example 1 was sprayed on the entire surface of the molded product that had completed the first firing process through Preparation Example 2 of the molded product. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 3] - Second glaze mixture + Deombeongsi oil

The entire surface of the molded object was glazed through the process of dipping the entire molded object that had completed the first firing process through Manufacturing Example 2 into a container containing the second glaze mixture prepared through Glaze Preparation Example 2. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 4] - Second glaze mixture + spray oil

Applying 10 g of the second glaze mixture prepared through Glaze Preparation Example 2 was sprayed on the entire surface of the molded product that had completed the first firing process through Preparation Example 2 of the molded object. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 5] - Third glaze mixture + Deombeongsi oil

The entire surface of the molded object was glazed through the process of dipping the entire molded object that had completed the first firing process through Manufacturing Example 2 into a container containing the third glaze mixture prepared through Glaze Preparation Example 3. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 6] - Third glaze mixture + spray oil

Applying 10 g of the third glaze mixture prepared in Glaze Preparation Example 3 was sprayed onto the entire surface of the molded product that had completed the first firing process through Preparation Example 2 of the molded product. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 7] - Fourth glaze mixture + Deombeongsi oil

The entire surface of the molded object was glazed by dipping the molded object that had completed the first firing process through Manufacturing Example 2 into a container containing the fourth glaze mixture prepared through Glaze Preparation Example 4. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 8] - Fourth glaze mixture + spray oil

Applying 10 g of the fourth glaze mixture prepared in Glaze Preparation Example 4 was sprayed on the entire surface of the molded product that had completed the first firing process through Preparation Example 2 of the molded product. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 9] - No. 5 glaze mixture + Deombeongsi oil

The entire surface of the molded object was glazed through the process of dipping the entire molded object that had completed the first firing process through Manufacturing Example 2 into a container containing the fifth glaze mixture prepared through Glaze Manufacturing Example 5. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 10] - No. 5 glaze mixture + spray oil

Proofing was performed by spraying 10 g of the fifth glaze mixture prepared in Glaze Preparation Example 5 on the entire surface of the molded product that had completed the first firing process through Preparation Example 2 of the molded object. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 11] - No. 6 Glaze Mixture + Deombeongsi Oil

The entire surface of the molded object was glazed through the process of dipping the entire molded object that had completed the first firing process through Manufacturing Example 2 into a container containing the sixth glaze mixture prepared through Glaze Preparation Example 6. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 12] - No. 6 glaze mixture + spray oil

Applying 10 g of the sixth glaze mixture prepared in Glaze Preparation Example 6 was applied to the entire surface of the molded product that had completed the first firing process through Preparation Example 2 of the molded product. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 13] - No. 7 glaze mixture + Deombeongsi oil

The entire surface of the molded object was glazed through the process of dipping the entire molded object that had completed the first firing process through the molded object Preparation Example 2 into a container containing the seventh glaze mixture prepared through the Glaze Preparation Example 7. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 14] - No. 7 glaze mixture + spray oil

Applying 10 g of the seventh glaze mixture prepared in Glaze Preparation Example 7 was applied to the entire surface of the molded product that had completed the first firing process through Preparation Example 2. Afterwards, the glaze on the bottom heel of the molded product was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, the secondary firing kiln was opened. Heating was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 15] - Proceed with the 3rd, 2nd and 1st glaze mixtures sequentially (Dumbeong + Spray + Dump)

The entire surface of the molded object was subjected to primary application through the process of dipping the molded object that had completed the first firing process through the molded object manufacturing example 2 into a container containing the third glaze mixture prepared through the glaze manufacturing example 3. did. Afterwards, without going through a separate drying process on the surface of the first coated molded object, 10 g of the second glaze mixture prepared through Glaze Preparation Example 2 was immediately sprayed on the entire surface of the first coated molded object to perform the second coat. was performed, and immediately after such spraying, without going through a separate drying process, the entire surface of the molded object was subjected to a third application through the process of dipping the entire product into a container containing the first glaze mixture prepared through the above glaze preparation example 1. The process proceeded. Afterwards, the glaze on the bottom heel of the molded product that had progressed to the third trial was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, 2 The heating of the tea firing kiln was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 16] - Proceed with the 3rd, 1st and 2nd glaze mixtures sequentially (Dumbeong + Spray + Dump)

The first glazing was performed on the entire surface of the molded object through the process of dipping the entire molded object that had completed the first firing process through the molded object manufacturing example 2 into a container containing the third glaze mixture prepared through the glaze manufacturing example 3. did. Afterwards, without going through a separate drying process on the surface of the first coated molded object, 10 g of the first glaze mixture prepared through Glaze Preparation Example 1 is immediately sprayed on the entire surface of the first coated molded object to perform a second coat. was performed, and immediately after such spraying, without going through a separate drying process, the entire surface of the molded object was subjected to a third application through the process of dipping the entire product into a container containing the second glaze mixture prepared through the above glaze preparation example 2. The process proceeded. Afterwards, the glaze on the bottom heel of the molded product that had progressed to the third firing was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, 2 The heating of the tea firing kiln was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 17] - Proceed with the 2nd, 1st and 3rd glaze mixtures sequentially (Dumbeong + Spray + Dump)

The entire surface of the molded object was subjected to primary coating through the process of dipping the molded object that had completed the first firing process through the molded object manufacturing example 2 into a container containing the second glaze mixture prepared through the glaze manufacturing example 2. did. Afterwards, without going through a separate drying process on the surface of the first coated molded object, 10 g of the first glaze mixture prepared through Glaze Preparation Example 1 is immediately sprayed on the entire surface of the first coated molded object to perform a second coat. was performed, and immediately after such spraying, without going through a separate drying process, the entire surface of the molded object was subjected to a third application through the process of dipping the entire product into a container containing the third glaze mixture prepared through the above glaze preparation example 3. The process proceeded. Afterwards, the glaze on the bottom heel of the molded product that had progressed to the third firing was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, 2 The heating of the tea firing kiln was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 18] - Proceed with the 2nd, 3rd and 1st glaze mixtures sequentially (Dumbeong + Spray + Dump)

The entire surface of the molded object was subjected to primary coating through the process of dipping the molded object that had completed the first firing process through the molded object manufacturing example 2 into a container containing the second glaze mixture prepared through the glaze manufacturing example 2. did. Afterwards, without going through a separate drying process on the surface of the firstly applied molded article, 10 g of the third glaze mixture prepared through Glaze Preparation Example 3 was immediately sprayed on the entire surface of the firstly applied molded article to perform a second application. was performed, and immediately after such spraying, without going through a separate drying process, the entire surface of the molded object was subjected to a third application through the process of dipping the entire product into a container containing the first glaze mixture prepared through the above glaze preparation example 1. The process proceeded. Afterwards, the glaze on the bottom heel of the molded product that had progressed to the third firing was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, 2 The heating of the tea firing kiln was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Comparative Example 19] - Proceed with the 1st, 3rd and 2nd glaze mixtures sequentially (Dumbeong + Spray + Dump)

The first glazing was performed on the entire surface of the molded object through the process of dipping the entire molded object that had completed the first firing process through the molded object manufacturing example 2 into a container containing the first glaze mixture prepared through the glaze manufacturing example 1. did. Afterwards, without going through a separate drying process on the surface of the firstly applied molded article, 10 g of the third glaze mixture prepared through Glaze Preparation Example 3 was immediately sprayed on the entire surface of the firstly applied molded article to perform a second application. was performed, and immediately after such spraying, without going through a separate drying process, the entire surface of the molded object was subjected to a third application through the process of dipping the entire product into a container containing the second glaze mixture prepared through the above glaze preparation example 2. The process proceeded. Afterwards, the glaze on the bottom heel of the molded product that had progressed to the third firing was wiped off and placed in a kiln for secondary firing. The secondary firing process was performed for 12 hours while maintaining the temperature of the kiln at 1,280°C. After 12 hours, 2 The heating of the tea firing kiln was stopped and maintained for 72 hours to gradually cool the molded product. Afterwards, the door of the kiln for the second firing was opened, and after 3 hours, the finished second firing pottery was taken out.

[Experiment 1]

An experiment in which the disc-shaped ceramics manufactured through Examples 1 and 2 and Comparative Examples 1 to 19 were placed in a high temperature chamber where the internal temperature was maintained at 40°C for 400 days and observed regularly to check whether discoloration occurred on the surface of the ceramics. was performed, and the results are shown in Table 1 below.

division 30 days have passed 100 days have passed 200 days have passed 300 days have passed 400 days have passed Example 1 X X X X X Example 2 X X X X X Comparative Example 1 X O O O O Comparative Example 2 X O O O O Comparative Example 3 X O O O O Comparative Example 4 X O O O O Comparative Example 5 X O O O O Comparative Example 6 X O O O O Comparative Example 7 X X O O O Comparative Example 8 X X O O O Comparative Example 9 X X O O O Comparative Example 10 X X O O O Comparative Example 11 X X O O O Comparative Example 12 X X O O O Comparative Example 13 X X O O O Comparative Example 14 X X O O O Comparative Example 15 X X X O O Comparative Example 16 X X X O O Comparative Example 17 X X X O O Comparative Example 18 X X X O O Comparative Example 19 X X X O O

(O: Discoloration occurs, X: No discoloration occurs)

Looking at the results in Table 1 above, it can be seen that in the case of ceramics manufactured according to the manufacturing method of the present invention, no discoloration occurs on the surface of the ceramics for a long period of time.

[Experiment 2]

An experiment in which the disc-shaped ceramics manufactured through Examples 1 and 2 and Comparative Examples 1 to 19 were placed in a high temperature chamber where the internal temperature was maintained at 40°C for 400 days and observed regularly to check whether cracks occurred on the surface of the ceramics. was performed, and the results are shown in Table 2 below.

division 30 days have passed 100 days have passed 200 days have passed 300 days have passed 400 days have passed Example 1 X X X X X Example 2 X X X X X Comparative Example 1 X O O O O Comparative Example 2 X O O O O Comparative Example 3 X O O O O Comparative Example 4 X O O O O Comparative Example 5 X O O O O Comparative Example 6 X O O O O Comparative Example 7 X X O O O Comparative Example 8 X X O O O Comparative Example 9 X X O O O Comparative Example 10 X X O O O Comparative Example 11 X X O O O Comparative Example 12 X X O O O Comparative Example 13 X X O O O Comparative Example 14 X X O O O Comparative Example 15 X X X O O Comparative Example 16 X X X O O Comparative Example 17 X X X O O Comparative Example 18 X X X O O Comparative Example 19 X X X O O

(O: Discoloration occurs, X: No discoloration occurs)

Looking at the results in Table 2 above, it can be seen that in the case of ceramics manufactured according to the manufacturing method of the present invention, no cracks occur on the surface of the ceramics for a long period of time.

[Experiment 3]

After placing the disc-shaped ceramics manufactured through Examples 1 and 2 and Comparative Examples 1 to 19 in a horizontal state, both sides of the ceramics were firmly fixed with clamps, and a 3-diameter porcelain was placed in the exact center of the ceramics at a certain height from the upper surface of the ceramics. An experiment was conducted to test whether cracks occurred on the surface of ceramics by dropping a stainless steel weight weighing 200 g in the shape of a cylinder with a circular cross-section of ㎝ vertically. The results are shown in Table 3 below.

Fall height 10cm 20cm 30cm 40cm 50cm Example 1 X X X X X Example 2 X X X X X Comparative Example 1 X O O O O Comparative Example 2 X O O O O Comparative Example 3 X O O O O Comparative Example 4 X O O O O Comparative Example 5 X O O O O Comparative Example 6 X O O O O Comparative Example 7 X X O O O Comparative Example 8 X X O O O Comparative Example 9 X X O O O Comparative Example 10 X X O O O Comparative Example 11 X X O O O Comparative Example 12 X X O O O Comparative Example 13 X X O O O Comparative Example 14 X X O O O Comparative Example 15 X X X O O Comparative Example 16 X X X O O Comparative Example 17 X X X O O Comparative Example 18 X X X O O Comparative Example 19 X X X O O

(O: Crack occurs due to impact, X: No crack occurs due to impact)

Looking at the results in Table 3 above, it can be seen that ceramics manufactured according to the manufacturing method of the present invention have very strong impact durability.

[Experiment 4]

The disc-shaped ceramics manufactured through Examples 1 and 2 and Comparative Examples 1 to 19 were completely immersed in an aqueous solution of sodium chloride in which 100 g of salt was completely dissolved in 3 liters of water for a certain period of time, and the surface of the ceramics was periodically chemically treated with the aqueous solution of sodium chloride. An experiment was conducted to observe whether damage occurred, and the results are shown in Table 4 below.

hour 5 days 10 days 20th 30 days 40 days Example 1 X X X X X Example 2 X X X X X Comparative Example 1 X O O O O Comparative Example 2 X O O O O Comparative Example 3 X O O O O Comparative Example 4 X O O O O Comparative Example 5 X O O O O Comparative Example 6 X O O O O Comparative Example 7 X X O O O Comparative Example 8 X X O O O Comparative Example 9 X X O O O Comparative Example 10 X X O O O Comparative Example 11 X X O O O Comparative Example 12 X X O O O Comparative Example 13 X X O O O Comparative Example 14 X X O O O Comparative Example 15 X X X O O Comparative Example 16 X X X O O Comparative Example 17 X X X O O Comparative Example 18 X X X O O Comparative Example 19 X X X O O

(O: Chemical damage occurs on the surface, X: No chemical damage occurs on the surface)

Looking at the results in Table 4 above, it can be seen that ceramics manufactured according to the manufacturing method of the present invention have very strong chemical resistance to aqueous sodium chloride solution.

[Experiment 5]

The disc-shaped ceramics manufactured through Examples 1 and 2 and Comparative Examples 1 to 19 were completely immersed in an aqueous sulfuric acid solution containing 3 liters of water and 500 ml of a 98% (w/w) sulfuric acid solution for a certain period of time and periodically An experiment was conducted to observe whether the surface of the ceramics was chemically damaged by an aqueous sulfuric acid solution, and the results are shown in Table 5 below.

hour 5 days 10 days 20th 30 days 40 days Example 1 X X X X X Example 2 X X X X X Comparative Example 1 X O O O O Comparative Example 2 X O O O O Comparative Example 3 X O O O O Comparative Example 4 X O O O O Comparative Example 5 X O O O O Comparative Example 6 X O O O O Comparative Example 7 X X O O O Comparative Example 8 X X O O O Comparative Example 9 X X O O O Comparative Example 10 X X O O O Comparative Example 11 X X O O O Comparative Example 12 X X O O O Comparative Example 13 X X O O O Comparative Example 14 X X O O O Comparative Example 15 X X X O O Comparative Example 16 X X X O O Comparative Example 17 X X X O O Comparative Example 18 X X X O O Comparative Example 19 X X X O O

(O: Chemical damage occurs on the surface, X: No chemical damage occurs on the surface)

Looking at the results in Table 5 above, it can be seen that ceramics manufactured according to the manufacturing method of the present invention have very strong chemical resistance to aqueous sulfuric acid solution.

Claims (4)

A first firing step of first firing and processing the clay dough molding product molded into a certain shape;
A first application step of first applying a first glaze mixture containing iron oxide to the surface of the first fired clay dough molding product;
After the first application step, a second application step of applying a second glaze mixture containing copper carbonate to the surface of the first application of the clay dough molding product;
After the second application step, a third application step of applying a third glaze mixture containing weak soil to the surface of the second application soil dough molding device; and
It includes a secondary firing step of processing the third-applied clay dough molding product by secondary firing,
The first glaze mixture contains iron oxide, manganese, barium carbonate, feldspar, silica, limestone, kaolin, and water,
The second glaze mixture contains copper carbonate, tin oxide, bone ash, zinc oxide, barium carbonate, feldspar, quartzite, marble, kaolin and water,
The third glaze mixture is a ceramic manufacturing method characterized in that it contains feldspar, silica, limestone, medicinal soil, oak ash, barium carbonate and water.





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