KR102382086B1 - Glaze composition for ceramic ware and preparation method thereof - Google Patents

Abstract

The present invention relates to a preparation method of a glaze composition for ceramics and a glaze composition for ceramics prepared thereby and, more specifically, to a preparation method of a glaze composition for ceramics which comprises the steps of: burning dried apple tree xylem; defending apple tree ash; preparing a mixture including the apple tree ash, natural stone and clay; and adding water to prepare a gel, thereby imparting turquoise color, the unique color of celadon, to ceramics and being treated so as to have excellent surface smoothness.

Description

Glaze composition for ceramics and manufacturing method thereof

The present invention relates to a glaze composition for ceramics and a method for manufacturing the same, and more particularly, to a glaze composition for ceramics comprising apple tree ash sediment, natural stone and clay, and a method for preparing the same.

In general, glaze refers to a glassy material that is thinly coated on the surface of ceramics to impart luster, color, and pattern. By applying a glaze to the surface of the porcelain to impart color and luster, it is possible to increase the aesthetics of the porcelain, while increasing the strength, stain resistance and durability of the porcelain. In addition, it is possible to reduce the absorbency, there is an advantage of increasing the resistance to water or chemicals. Glaze should melt and flow well when glazed and baked on pottery to form a thin glass film on the surface by closely adhering to the base material.

Glazes are generally transparent, but there are opalescent oil, colored oil, crystal oil, salt-free oil, and crack oil. The composition and composition of the glaze differ according to the high and low firing temperature and the soil quality, and are generally classified into porcelain oil and earthenware oil. The main component is a silicic acid compound, and the raw material used is calcined at a high temperature (1,200~1,500℃) like porcelain, and there are feldspar, quartz, limestone, kaolin, etc. Kaolin, borax, feldspar, limestone, etc. are used. To add color, a metal oxide compound such as iron, copper, or cobalt is mixed.

In the case of glazes for manufacturing celadon, etc., since most chemicals are used, it is not only a factor polluting the environment, but also has a problem in that it is not easy to obtain the original color or texture of the natural celadon. Components such as iron, copper, cobalt, and manganese, which are color materials for making celadon turquoise, are pointed out as the cause of environmental pollution, and since they are expensive, there is a problem that the production cost increases when used.

KR 100919742 B1

An object of the present invention is to provide a glaze composition for ceramics capable of producing ceramics having excellent aesthetics, and a manufacturing method capable of producing the same.

According to one aspect of the present invention, the first step of obtaining apple tree material by completely burning the dried apple tree wood; a second step of adding water to the apple tree ash and leaving the suspension obtained by filtration for 20 to 30 hours, removing the supernatant, and drying the precipitate to obtain apple tree ash sediment; 50 to 60 parts by weight of the apple tree sediment, 10 to 15 parts by weight of feldspar, 5 to 10 parts by weight of silica, 5 to 10 parts by weight of limestone, 1 to 5 parts by weight of dolomite, 1 to 5 parts by weight of sericite, 3 to 10 parts by weight of basalt a third step of preparing a powder mixture by grinding and mixing parts by weight, 1 to 5 parts by weight of bone ash, and 5 to 10 parts by weight of kaolin; and a fourth step of preparing a gel by adding water to the powdery mixture; A method for producing a glaze composition for ceramics, comprising: may be provided.

Also, in the third step, at least one selected from the group consisting of germanium, aluminum oxide (Al ₂ O ₃ ), and zinc oxide (ZnO) may be further added and mixed in an amount of 1 to 5 parts by weight.

According to another aspect of the present invention, there may be provided a glaze composition for ceramics prepared by the above manufacturing method.

In addition, it may exhibit a blue-green color after calcination under reduced calcination conditions of 1200 to 1230 °C.

According to the manufacturing method according to an aspect of the present invention, a glaze composition for ceramics that can be treated to give ceramics a unique turquoise color and to have excellent surface smoothness and tactile feel can be manufactured.

The glaze composition for ceramics manufactured by the manufacturing method according to an aspect of the present invention can impart a unique color to celadon without including expensive chemicals. can be manufactured.

In addition, since the adhesion to the substrate is excellent and the flowability is excellent, the lubrication process is simplified, and the surface defect rate of the manufactured porcelain is reduced, so that the manufactured porcelain has a uniform surface and excellent hardness and durability.

1 is a flowchart of a method for manufacturing a glaze composition for ceramics according to an embodiment of the present invention.

The present invention relates to a method for preparing a glaze composition for ceramics and to a glaze composition for ceramics prepared thereby.

Hereinafter, a preferred embodiment according to the present invention will be described with reference to the drawings. However, this is only an exemplary embodiment and the present invention is not limited thereto. The technical spirit of the present invention is determined by the claims, and the following examples are only one means for efficiently explaining the technical spirit of the present invention to those of ordinary skill in the art to which the present invention belongs. In addition, since the accompanying drawings are only an example shown to explain the technical idea of the present invention in more detail, the technical idea of the present invention is not limited to the form of the accompanying drawings.

In the description of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. And the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

1 is a flowchart illustrating an embodiment of a method for manufacturing a glaze composition for ceramics according to an aspect of the present invention. Referring to Figure 1, the method for producing a glaze composition for ceramics according to a preferred embodiment of the present invention includes the steps of completely burning an apple tree to obtain an apple tree material (S1); Defending the apple tree ash (S2); pulverizing and mixing apple wood ash, natural stone, bone ash and clay (S3); and adding water to prepare a gel composition (S4).

First, the first step (S1) of obtaining apple tree material by completely burning the apple tree is performed. Here, the woody part of the apple tree is used as a raw material, and this step (S1) may be performed by preparing the dried apple tree woody part and completely burning it. The drying may be performed by placing the woody part of the apple tree in a well-ventilated shade for 15 to 30 days. Complete combustion is performed by burning the dried apple tree xylem in an enclosed space to obtain apple tree ash.

Next, the step (S2) of fertilizing the apple tree ash is performed. This step (S2) is performed to remove the alkali component of the apple tree ash, put the apple tree ash obtained in the previous step (S1) into a container, add 2 to 3 times water, and leave the alkali component When it is dissolved in water, it can be achieved by removing the supernatant. After adding water to the apple tree ash, before leaving it for a while, filtration is preferably performed first through a 60 to 80 mesh sieve to remove impurities, and the suspension obtained by filtration is left for 20 to 30 hours and then the supernatant is removed to remove the precipitate It is possible to obtain the apple tree ash sediment obtained by After adding water to the apple tree ash and leaving it for a while, the process of removing the supernatant may be repeated several times, and preferably performed 1 to 3 times. The final fertilized apple tree ash sediment is dried in the shade for 2 to 10 days to obtain dried apple tree ash sediment. The apple tree ash sediment obtained through the above-described method may be added and used as a main color component to improve the characteristic cyan color in the glaze composition according to an aspect of the present invention.

Next, the step (S3) of pulverizing and mixing apple tree ash, natural stone, bone ash and clay is performed. A mixture for a glaze composition may be prepared by mixing and adding natural stone, bone ash and clay to the apple tree ash sediment obtained in the previous step (S2). Here, the natural stone may include feldspar, silica, limestone, dolomite, sericite and basalt, and the clay may include kaolin. If necessary, the natural stone may further include germanium, and the clay may further include refractory earth.

The mixture may be prepared in the form of a pulverized powder, and each raw material component to be mixed to prepare the mixture may be pulverized before mixing or pulverized after being mixed. The mixture is 50 to 60 parts by weight of the apple tree ash sediment, 10 to 15 parts by weight of feldspar, 5 to 10 parts by weight of silica, 5 to 10 parts by weight of limestone, 1 to 5 parts by weight of dolomite, 1 to 5 parts by weight of sericite, basalt 3 to 10 parts by weight, 1 to 5 parts by weight of bone ash, and 5 to 10 parts by weight of kaolin may be included. The pulverization may be performed by a known method, for example, the raw material may be pulverized into fine particles using a jet pulverizer or a ball mill. The pulverized raw material is preferably filtered through a 125 to 170 mesh sieve so that those having a particle size of a predetermined size are mixed.

If the silicon content is high, the glaze does not melt easily at high temperatures and the color becomes cloudy. Apple wood ash has a low content of silicon and iron compared to other ash, so when it is included in the glaze, it has excellent color clarity and reduces the phenomenon of the glaze flowing down easily. There are advantages to doing it. In addition, the high phosphorus oxide content has the effect of allowing the appearance of the manufactured porcelain to have a soft feeling with a non-excessive gloss. When the content of apple tree ash sediment in the mixture for preparing the glaze composition according to an aspect of the present invention is less than 50 parts by weight or more than 60 parts by weight, it may be difficult to develop a color suitable for celadon.

Feldspar functions as a fluxing agent that helps the fusion of silica and limestone. When clay is added, it dissolves the clay to give it strength and helps the glaze to adhere to the clay surface. When the content of feldspar is less than 10 parts by weight in the mixture for preparing the glaze composition according to one aspect of the present invention, the glaze does not adhere well to the porcelain surface, which may cause a problem of roughness of the porcelain surface, and more than 15 parts by weight When it is included, the flowability of the glaze produced is not good, so the surface smoothness may be lowered, while a problem may occur in that the clarity is lowered when the color is expressed.

Quartzite plays a role in forming the vitreous as the framework of the glaze. In the mixture for preparing the glaze composition according to an aspect of the present invention, if the silicate content is less than 5 parts by weight, glassy formation may not be well and the roughness of the porcelain surface may occur. The surface of the porcelain becomes rough and there may be a problem in that the sharpness is lowered when the color is expressed.

Limestone improves the flow of the glaze while also functioning as a fluxing agent, affecting the luster and flexibility of the porcelain surface by emulsifying it. If the content of limestone in the mixture for the preparation of the glaze composition according to one aspect of the present invention is less than 5 parts by weight, the glaze does not dissolve well and thus the porcelain surface becomes rough. There may be problems with degradation.

Dolomite prevents glassy cracks from forming and lowers the coefficient of thermal expansion without changing the fusion temperature of the glaze. When the dolomite content is less than 1 part by weight in the mixture for preparing the glaze composition according to one aspect of the present invention, it is difficult to exert the effect due to the addition, so that the fluidity of the glaze is reduced, the color evenness is reduced, and the surface touch of the porcelain is reduced. A problem of lowering may occur, and if it exceeds 5 parts by weight, a problem of lowering the surface feel may occur. In the mixture for preparing the glaze composition according to an aspect of the present invention, the content of limestone and dolomite is preferably included to have a mixing weight ratio of 1: 0.2 to 0.5. When the limestone and dolomite contents are included in the mixture to have the above-mentioned weight ratio, there is an advantage in that the surface smoothness and touch of the porcelain are optimized during the glazing to be produced, and the color distribution is even, so that it has an aesthetic appearance.

Sericite gives color to the glaze so that the porcelain has a color suitable for celadon and excellent luster. If the content of sericite in the mixture for preparing the glaze composition according to one aspect of the present invention is less than 1 part by weight or more than 5 parts by weight, a problem in which the color of the developed ceramics is deteriorated may occur.

Basalt enhances the color clarity for blue color so that more vivid colors can be developed. If the content of basalt in the mixture for preparing the glaze composition according to an aspect of the present invention is less than 3 parts by weight or more than 10 parts by weight, there may be a problem in that the color clarity is deteriorated.

If necessary, the mixture may further include 1 to 5 parts by weight of germanium. Germanium may improve the stain resistance and durability of ceramics, and if the added content is less than 1 part by weight, it is difficult to show the effect due to the addition, and if it exceeds 5 parts by weight, a problem of increasing the surface roughness of the ceramic may occur.

Bone ash is added to improve glaze permeability and can be obtained by burning bone. Preferably, it may be obtained by burning fat-removed bovine bones at a temperature between about 880 and 980° C. and then pulverizing them. When the content of bone ash in the mixture for preparing the glaze composition according to an aspect of the present invention is less than 1 part by weight or more than 5 parts by weight, a problem of lowering the clarity when the color is expressed may occur.

Kaolin serves to suspend the glaze slip and provide adhesion to the substrate. If the content of kaolin in the mixture for preparing the glaze composition according to one aspect of the present invention is less than 5 parts by weight, the color may be deteriorated and the glaze layer may be peeled off when the color is expressed. Sharpness is lowered, the surface smoothness is lowered, the flow of the glaze is deteriorated, and there may be problems that the lubrication workability is lowered.

If necessary, the clay may further include refractory soil. In this case, the mixing ratio of kaolin and refractory soil may be 1 to 0.15 to 0.3. When the content of the refractory soil mixed and added to the kaolin is less than the above-mentioned content range, it is difficult to exhibit the effect of improving heat resistance and durability due to the addition, and when the content exceeds the above-mentioned content range, the color may not be evenly expressed.

If necessary, the mixture may further include 1 to 5 parts by weight of at least one selected from the group consisting of aluminum oxide (Al ₂ O ₃ ) and zinc oxide (ZnO). When aluminum oxide is added, it can improve the viscosity of the glaze and improve the firmness and durability of the glazed porcelain, and zinc oxide can reduce the coefficient of thermal expansion of the glaze, soften the glaze, and impart luster. When the content of at least one selected from the group consisting of aluminum oxide (Al ₂ O ₃ ) and zinc oxide (ZnO) is less than 1 part by weight, it is difficult to show the effect due to the addition, and when it exceeds 5 parts by weight, the surface roughness of the ceramics increases. problems may arise.

Next, a step (S4) of preparing a gel composition by adding water to the powder mixture prepared in the previous step (S3), which is prepared by mixing the above-mentioned raw materials, is performed. A predetermined amount of water may be added while stirring the powdery mixture to prepare a gel composition. At this time, the amount of water added is preferably 50 to 110 parts by weight, preferably 60 to 80 parts by weight, based on 100 parts by weight of the powdery mixture. When the mixing weight ratio of the powder mixture and water is within the above range, there is an advantage in that the flowability and applicability of the glaze to be manufactured are optimized. In order to maximize the effect of the oil, the gel composition is preferably applied to the oil after filtering it through a 125 to 170 mesh sieve.

If necessary, the gel composition may be aged at a low temperature before application. When the gel composition is aged and applied at a low temperature, adhesion to the substrate is strengthened while maintaining excellent flowability, and the surface durability is strengthened even after firing and the expressed color clarity is improved. The low-temperature aging may be performed at 5 to 15° C. for 7 to 30 days. If the low-temperature aging period is less than 7 days, it is difficult to show the effect due to the aging, and if it exceeds 30 days, the degree of improvement in the effect due to the lapse of time is not remarkable, so a problem of lowering productivity may occur.

The glaze composition for ceramics prepared by the manufacturing method according to an embodiment of the present invention may be reduced-fired to express a celadon-specific aesthetic turquoise color that is a desired color. After applying the glaze composition for ceramics prepared by the manufacturing method according to an embodiment of the present invention to the primary fired ceramics, the second reduction firing at a temperature of 1200 to 1230 ° C. All of them can make excellent ceramics.

Hereinafter, more specific and preferred examples are presented to help the understanding of the present invention, but these examples are merely illustrative of the present invention and do not limit the appended claims, and are within the scope and spirit of the present invention. It is obvious to those skilled in the art that various changes and modifications to the embodiments are possible, and it is natural that such variations and modifications fall within the scope of the appended claims.

Example

<Preparation of apple tree ash sediment>

After completely burning the apple tree branches dried in the shade for 10 days to obtain ash, put it in a container, add twice the volume based water, and stir it, and then filter it sequentially using a 60 mesh sieve and 80 mesh sieve to remove impurities. . After the impurity-removed suspension was left for 25 hours, the supernatant was removed and a precipitate was obtained, which was left in the shade for 3 days to dry completely to obtain dried apple tree ash sediment, which was used for the preparation of a glaze composition.

<Preparation of glaze composition>

Each component was mixed in a compounding ratio according to Table 1 below. Each component was pulverized using a ball mill before mixing, and filtered through a 130 mesh sieve was used to prepare a mixture for preparing a glaze composition. In Table 1 below, the content of each component means parts by weight, and in the case of Preparation Example 1, a mixture of kaolin and refractory earth was used in a 3:1 weight ratio, and in Preparation Example 10, kaolin and refractory earth were used in a 1:1 ratio. A mixture was used in a weight ratio, and kaolin was used in other preparation examples.

Preparation Example 1 Preparation Example 2 Preparation 3 Preparation 4 Production Example 5 Preparation 6 Preparation 7 Preparation 8 Preparation 9 Preparation 10 apple tree
re 53 56 53 40 63 50 50 50 50 52 feldspar 12 10 10 10 10 10 10 10 10 12 burr 7 6 5 10 5 10 10 5 10 7 limestone 7 6 5 10 5 10 9 5 10 7 dolomite 2 3 2 5 One 5 4 2 - 2 sericite 2 2 4 5 One 5 2 2 - 2 basalt 3 3 6 5 4 - 10 5 5 3 germanium One - - - - - - - - - bone ash 3 3 5 5 4 - 5 5 5 3 clay 8 8 10 10 7 10 - 16 10 12 Oxidation
aluminum One One - - - - - - - - zinc oxide One 2 - - - - - - - -

Each component was put into a stirrer at a mixing ratio according to Table 1, and while stirring and mixing, one-fold water was added. After filtering it through a sieve, it was aged in the shade of 15°C for 7 days and used for fertilization.

<Preparation of ceramic specimens for evaluation>

Each of the compositions of Preparation Examples 1 to 9 according to Table 1 was applied to the upper surface of the unglazed white porcelain specimens at 900° C., and then the test pieces were prepared by chaebol-roasting them with gas in a reducing atmosphere at 1210° C. for 1 hour. Two test pieces were prepared for each preparation example, and sensory evaluation and physical property evaluation were performed on the prepared test pieces.

For sensory evaluation, trained panelists (10 females and 10 males in their 30s and 40s) evaluated the color, appearance, and feel of the upper surface of the test piece glazed with the glaze composition of Preparation Examples 1 to 9 on a 5-point scale (1= Very dislike, 3 = average, 5 = very good) was evaluated. In detail, the color is similar to that of Goryeo celadon, showing a deep turquoise color, the appearance is the case where the overall color is uniform and there is no part where the glaze is dried or peeled while giving a soft luster, and the touch is when the surface is not rough. The smooth case was evaluated as 5 points, which is a very good condition, and the average value was obtained for each item and evaluated, and the results are shown in Table 2 below.

The evaluation of the physical properties of the glaze layer was conducted to confirm the strength and long-term durability. In terms of strength, the case where there was no abnormality when using a microwave oven was evaluated as ○, and the case where abnormalities such as microcracks occurred on the surface were evaluated as ×. To evaluate the long-term durability of the glaze layer, the process of immersing another test piece in water for 1 day and drying it in a dry oven at 60°C for 1 day is repeated 15 times as a set, and peeling phenomenon from the surface or edge of the glaze layer formed on the upper surface was observed, and as a result, a case in which microcracks or peeling was not observed was evaluated as ○, and a case in which microcracks or peeling was observed was evaluated as ×. The evaluation results are summarized in Table 2 below.

division sensory evaluation Physical property evaluation colour Exterior touch burglar long term
durability Preparation Example 1 4.7 4.8 4.7 ○ ○ Preparation 2 4.6 4.6 4.7 ○ ○ Preparation 3 4.6 4.6 4.4 ○ ○ Preparation 4 3.7 4.3 4.0 ○ ○ Preparation 5 3.9 4.4 4.2 ○ × Preparation 6 3.5 3.8 4.0 ○ ○ Preparation 7 4.3 4.0 3.8 × × Preparation 8 3.8 3.3 4.0 × × Preparation 9 4.0 3.4 3.9 ○ ○ Preparation 10 3.4 3.0 3.8 ○ ×

Referring to Table 2, it can be seen that the sensory evaluation and physical property evaluation results were both excellent in the case of the test pieces glazed with the glaze compositions of Preparation Examples 1 to 3 corresponding to Examples of the present invention. In Preparation Examples 4 and 5, in which the apple tree ash sediment content was out of the appropriate content range, and in Preparation Example 6 in which bone ash and volcanic stone were excluded, the degree of color expression was significantly reduced, and the clay content was out of the appropriate content range in Preparation Example 7, In Figures 8 and 10, peeling of the glaze was observed, or the color was not evenly distributed and the glaze was dried, and the appearance evaluation was significantly lowered. In Preparation Example 10, in which an excessive amount of refractory soil was included, a decrease in color and appearance was particularly remarkable. In Preparation Example 9, in which some natural stone components were excluded, the color was not evenly distributed, so the appearance evaluation was significantly lowered and the roughness of the surface increased.

It was confirmed that the glaze composition prepared by the manufacturing method according to a preferred embodiment of the present invention can express an aesthetically excellent celadon color when it is fired after lubrication, and also has excellent adhesion to the substrate, resulting in excellent strength and long-term durability. .

Claims (4)

A method for producing a glaze composition for ceramics exhibiting a blue-green color after firing under reduced firing conditions of 1200 to 1230°C, the method comprising:
a first step of completely burning the dried apple tree xylem to obtain apple tree ash;
a second step of adding water to the apple tree ash and leaving the suspension obtained by filtration for 20 to 30 hours, removing the supernatant, and drying the precipitate to obtain apple tree ash sediment;
50 to 60 parts by weight of the apple tree ash sediment, 10 to 15 parts by weight of feldspar, 5 to 10 parts by weight of silica, 5 to 10 parts by weight of limestone, 1 to 5 parts by weight of dolomite, 1 to 5 parts by weight of sericite, 3 to 10 parts by weight of basalt a third step of preparing a powder mixture by grinding and mixing parts by weight, 1 to 5 parts by weight of bone ash, and 5 to 10 parts by weight of kaolin; and
a fourth step of adding water to the powder mixture to form a gel and aging at 5 to 15° C. for 7 to 30 days at low temperature; A method for producing a glaze composition for ceramics, comprising:
The method of claim 1,
In the third step, germanium, aluminum oxide (Al ₂ O ₃ ), and at least one selected from the group consisting of zinc oxide (ZnO) is further added and mixed in an amount of 1 to 5 parts by weight, a method for producing a glaze composition for ceramics.
A glaze composition for ceramics, prepared by the method of claim 1 or 2.
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