KR20200053912A - Translucent celadon composition and manufacturing method of the same - Google Patents

Abstract

The present invention is formed by mixing ceramics in which a tricalcium phosphate (TCP) crystal phase is a main crystal phase and an anorthite crystal phase is a sub-crystal phase. A crystal structure of conventional porcelain is mostly composed of mullite and quartz, and thus does not have translucent properties. Crystallization of the mullite and quartz is suppressed, TCP (Ca_3(PO_4)_2) main crystal is generated, and anorthite sub-crystal is generated, thereby manufacturing ceramics having excellent translucent properties, moldability, and whiteness and deducing an optimal component content ratio.

Description

Translucent ceramic composition and method for manufacturing the same {TRANSLUCENT CELADON COMPOSITION AND MANUFACTURING METHOD OF THE SAME}

The present invention relates to a ceramic porcelain, and more particularly, to a light-transmitting porcelain composition that can be used for lighting and a method for manufacturing the same.

In general, ceramics are manufactured using clay, which has excellent plasticity, into bowls, bottles, and pots. Recently, various demands have arisen based on eco-friendly characteristics of ceramics.

Particularly, attempts have been made to make lighting products using ceramics. Recently, along with the development of LED lighting, there is a need to develop lighting ceramics for physical properties corresponding to this.

Accordingly, porcelain products in which a light is transmitted through a hole in a porcelain to make light distribution through a hole or to form a porcelain with a thickness of 2 to 3 mm are being developed.

However, this form does not conform to various three-dimensional structures of lighting products, and there is a problem in that durability is significantly reduced due to the thin thickness of ceramic products. Accordingly, as in Korean Patent Registration No. 10-1651354, a technique has been developed to secure the strength of ceramics in order to maintain a thin thickness of ceramics, but there is still no technology to express the translucency of ceramics itself.

In addition, even when expressing light transmittance, plasticity and the like of the base must be secured for molding. Since there is no light transmittance expression technology, there is no technology for securing the strength and plasticity of the base while expressing light transmittance.

[Advanced technical literature]

Korean Registered Patent No. 10-1651354 (2016. 08. 25.)

The present invention is to solve the problems of the prior art described above, the object of the present invention is to provide a porcelain composition that is secured permeability itself.

In addition, the present invention is to provide a porcelain composition that ensures the whiteness and formability of the substrate while ensuring transmittance.

The present invention improves the light transmittance of the substrate in order to utilize a ceramic material having low light transmittance as an interior light, than glass, acrylic, and plastic materials used as general lighting. The general possession of porcelain cannot be used as a light fixture due to its low light transmittance, but since it has a certain degree of light transmittance in the case of the main china substrate having a TCP (Tricalcium phosphate) crystal structure, the light transmittance of this material is improved to produce it as a light fixture and a support body.

At this time, in order to improve the light transmittance, we developed a technology that suppresses the existing crystalline phases of quartz and mullite, and can be generated by uniformly distributing TCP crystals. That is, the above problem was solved by providing a light-transmitting porcelain composition with a base in which a TCP (Tricalcium Phosphate, Ca3 (PO4) 2) crystal phase is the main crystal phase.

 In addition, for various types of designs, we developed a technology that can improve the plasticity of your possession.

In one embodiment of the present invention, a TCP (Tricalcium Phosphate) crystal phase is a main crystal phase, and the Anorthite crystal phase is formed by blending a sub-crystalline phase. In other words, the crystal structure of ordinary ceramics is mostly made of Mullite and Quartz, so it does not have light transmission properties, but it suppresses crystallization of Mullite and Quartz and generates TCP (Tricalcium phosphate, Ca3 (PO4) 2) main crystal and Anorthite sub-crystalline phase. A substrate having excellent light transmittance, moldability, and whiteness was prepared, and an optimum component content ratio was derived.

In one aspect of the present invention, the possession of synthetic ash 35 to 45% by weight, limestone 10 to 15% by weight, kaolin 12 to 14% by weight, field par (Felds par) 18 to 20% by weight, Potterystone 3 to 5 It consists of 5% to 6% by weight of the composition component.

In addition, the base is 25 to 32% by weight of SiO2, 22 to 27% by weight of CaO, 22 to 23% by weight of P2O5, 2.5 to 3.5% by weight of KNaO, 11 to 13% by weight of Al2O3, 0.08 to 0.10% by weight of Fe2O3 Is done. At this time, the Ca / P ratio in the substrate is formed from 1.38 to 1.50. This is because light transmission has also reduced the limestone, which is an inhibitory factor.

On the other hand, the base material may be further blended with natural bone ash, but it was confirmed that the synthetic bone ash was more highly transmissive.

In addition, the substrate may further include a mullite crystal phase or a Kurtz crystal phase.

In another aspect, the present invention is a step of first mixing the raw material and mixing by secondary high-speed agitation, vacuum smelting the blended raw material to produce a base material in which the TCP crystal phase is the main crystal phase and the Anorthite crystal phase is the sub-crystalline phase, High-speed stirring by adding water to the TCP substrate, followed by low-speed stirring, injecting and molding the slurry into the stirred substrate, and drying and then firing the molded body, and firing comprises 850 to 950 The above problem was solved by providing a method of providing a translucent porcelain composition that is first fired in FIG. And re-heated at 1250 to 1270 degrees and secondly fired.

In one embodiment of the present invention, the possession is 35 to 45% by weight of synthetic bone ash, 10 to 15% by weight of limestone, 12 to 14% by weight of kaolin, 18 to 20% by weight of Felds par, 3 to 3 of Potterystone 5% by weight, consisting of 5 to 6% by weight of the composition components, 25 to 32% by weight of SiO2, 22 to 27% by weight of CaO, 22 to 23% by weight of P2O5, 2.5 to 3.5% by weight of KNaO, Al2O3 consists of 11 to 13% by weight and Fe2O3 0.08 to 0.10% by weight.

The light-transmitting porcelain composition according to the present invention maintained the whiteness and moldability of the porcelain while securing the permeability according to the formation of the TCP crystal phase and the anorthite crystal phase.

1 is a view showing a manufacturing process of the base according to an embodiment of the present invention.
2 is a view showing a manufacturing process of the molded body according to an embodiment of the present invention.
3 is a graph showing the results of the plasticity measurement of the TCP composition.
4 is a graph showing the transmittance of the TCP crystal-forming fired body.
5 is a graph showing the whiteness of the TCP crystal-forming fired body.
6 is a graph showing the strength of the TCP crystal-forming fired body.

Hereinafter, preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various modifications by those skilled in the art within the scope of the technical spirit of the present invention. This is possible. Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

Hereinafter, a translucent porcelain composition and a method for manufacturing the same according to an embodiment of the present invention will be described in detail.

TCP decision generation and Translucent  Possession manufacturing

The present invention has developed a technique for generating and controlling TCP (Tricalcium phosphate, Ca3 (PO4) 2) crystals in order to impart and improve light transmittance to a substrate having a lighting effect. In order to confirm the conditions for the formation of TCP crystals, the ratio of CaO and P2O5, the representative chemical components of SiO2 and the chemical components required for TCP production, was adjusted to evaluate the physical properties after mixing the raw materials.

The chemical components affecting the TCP crystal formation conditions were found to be SiO2, CaO, and P2O5 components. Mullite crystals are formed as the content of SiO2 increases, and anorthite crystals are formed when the SiO2 content and CaO content are about 1: 1.

In addition, it was confirmed that when the P2O5 component is added to SiO2 and CaO, TCP crystals are generated and anorthite crystals are formed along with the composition. Therefore, in order to generate TCP crystals, the ratio of CaO and P2O5 is very important, and a technique for generating and controlling crystals was applied to the substrate by evaluating the properties of the synthesized TCP according to this ratio.

To this end, based on the evaluation of the physical properties of the white porcelain, the ratio of SiO2, CaO, and P2O5 components was adjusted to form the primary blending ratio within the range in which TCP crystals are generated. The basic composition is composed of feldspar, pottery, and kaolin, which are solvents, and bone ash is added to create light transmission properties.

Referring to FIG. 1, raw materials having a primary composition were blended to prepare a substrate. In the method of mixing the raw materials, the raw materials were first mixed by ball milling, followed by secondary mixing with a high-speed stirrer. After removing the iron powder by injecting the mixed slurry with a degreasing machine, the sieve was sieved to 325 mesh using a vibrating body. The sieved slurry was put in a vacuum extrusion filter (filter press) to remove moisture, and then vacuum smelted in a vacuum smelter to prepare TCP crystallization substrates.

As shown in FIG. 1, a TCP crystal-forming substrate was prepared, and a molded article was prepared as shown in FIG. The molding method was an injection molding method, and 21% of moisture was added to the TCP substrate, followed by high-speed stirring for 4 hours and low-speed stirring for 24 hours. After confirming the proper viscosity and specific gravity (viscosity, specific gravity value) and injecting the slurry into a gypsum mold, it was molded and dried at 60 ° C. for 24 hours to prepare.

At this time, the prepared molded body was completely dried and then heated to 900 ° C for primary firing, and then again heated to 1280 ° C for secondary firing. In the second firing, a holding time of about 1 hour at a high temperature was given to maintain the firing temperature at a high temperature. Thereafter, the product was naturally cooled to prepare a TCP crystal-forming fired body. Under these firing conditions, the primary firing temperature and the secondary firing temperature were determined in consideration of the basic properties such as absorption, shrinkage, and density of the TCP crystal-generated firing body.

Test Example 1

Composition of Test Example 1 NO Boneash Lime
stone Kaolin Feldspar Pottery
stone Transmittance
(%) Whiteness Formability Remark NB SB 1-1 70 25 5 44 0 ? 1-2 60 30 10 48 0 0 1-3 50 35 15 43 0 0 1-4 40 40 20 41 0 0

Chemical composition of Test Example 1 _NO SiO ₂ CaO P ₂ O ₅ KNaO Al ₂ O ₃ Fe ₂ O ₃ Ig.loss Ca / P 1-1 15.83 37.45 28.18 0.75 9.90 0.07 5.74 1.67 1-2 21.62 32.10 24.15 1.50 12.64 0.09 6.08 1.67 1-3 27.41 26.75 20.13 2.25 15.38 0.10 6.40 1.67 1-4 33.18 21.40 16.10 3.00 17.66 0.30 4.04 1.67

In Test Example 1, a comparative test was performed for each amount of NB (natural bone ash) added. The physical properties of P2O5 were analyzed, and the Ca / P ratio was fixed at 1.67 by using NB. At this time, Kaolin was added more than 20% to ensure minimal formability, and feldspar was added to improve sinterability.

The moldability of the 1-2 to 1-4 composition was good, and the whiteness was good due to the use of NB, but a phenomenon that appeared as a yellow series occurred. At this time, it was confirmed that the P2O5 content is excellent when the 20 ~ 25% Al2O3 content is 10 ~ 15%. In addition, it was confirmed that it is desirable to lower the Ca / P ratio in order to improve the permeability, and the increase in the amount of Kaolin increases the Al2O3 content, leading to a decrease in transmittance, and it is desirable to reduce the amount of addition. It was analyzed to be necessary. On the other hand, feldspar needs to be added at least 10% to improve sinterability.

Test Example 2

Composition of Test Example 2 NO Boneash Lime
stone
(Limestone) Kaolin
(china clay) Feldspar
( feldspar ) Pottery
stone
( Stone ) Transmittance
(%) Whiteness Formability Remark NB SB 2-1 30 11 26 26 7 50 0 0 2-2 40 15 20 20 5 55 0 ? 2-3 50 19 15 15 3 45 ? x 2-4 60 22.5 8 8 1.5 40 ? x

Chemical composition of Test Example 2 SiO ₂ CaO P ₂ O ₅ KNaO Al ₂ O ₃ Fe ₂ O ₃ Ig.loss Ca / P 2-1 35.84 19.39 16.75 1.13 15.12 0.06 7.37 1.48 2-2 27.26 26.03 22.34 3.36 11.59 0.09 9.33 1.48 2-3 15.32 32.69 27.93 2.74 9.90 0.12 9.51 1.48 2-4 9.85 39.05 33.51 1.50 8.11 0.07 9.70 1.48

In Test Example 2, SB (synthetic bone ash) and Lime stone (limestone) were added while changing the amounts. The Ca / P ratio was fixed at 1.5, the P2O5 content was increased, and the SB addition amount was increased to increase the P2O5 content. In addition, the amount of Lime stone was adjusted to fix the Ca / P ratio at 1.5. In the case of using SB, as the amount of Lime stone added increased, the moldability deteriorated and the use of Clay was required. As the use of Clay (clay) increased, the transmittance decreased, so it was preferable to use a content of 10% or less.

As a result, the whiteness was better than the use of SB (Whitish color), and when the amount of SB added increased to 50% or more, the whiteness decreased. This was analyzed as an increase in the amount of Limestone added. In addition, when the Ca / P ratio is adjusted to 1.48 or less, an improvement in transmittance is expected.

Test Example 3

Composition of Test Example 3 NO Boneash Lime
stone Kaolin Feldspar Pottery
stone Clay Transmittance
(%) Whiteness Formability Remark NB SB 3-1 40 20 14 20 6 50 0 ? 3-2 40 15 14 20 5 6 55 0 0 3-3 40 12 14 20 8 6 55 0 0 3-4 40 10 14 20 10 6 57 0 0

Chemical composition of Test Example 3 SiO ₂ CaO P ₂ O ₅ KNaO Al ₂ O ₃ Fe ₂ O ₃ Ig.loss Ca / P 3-1 21.09 28.84 22.34 3.00 13.00 0.09 11.64 1.63 3-2 27.26 26.04 22.34 3.00 11.59 0.09 9.33 1.48 3-3 31.10 24.37 22.34 3.00 10.75 0.09 8.29 1.38 3-4 33.89 23.25 22.34 3.00 9.96 0.09 7.37 1.32

In Test Example 3, the SB addition amount was fixed at 40%, and the Limestone addition amount was adjusted to test by Ca / P ratio. At this time, the SB content was fixed and the Ca / P ratio was changed and analyzed. The Ca / P ratio was tested at 1.63 to 1.32, and the permeability and fire resistance were checked while lowering the Ca / P ratio. In addition, the moldability and permeability were checked according to the comparative use of Kaolin and Potterystone.

As a result, the lower the Ca / P ratio, the better the permeability due to the increase in the TCP crystal phase, and the lower the Ca / P ratio, the lower the fire resistance. The permeability and fire resistance of the 3-3 composition were the best, and the permeability of the 3-4 composition was the best, but the fire resistance was low. It was confirmed that the use of potterystone has an effect of enhancing light transmittance when using Kaolin.

Test Example 4

Composition of Test Example 4 Boneash Lime
stone Kaolin Feldspar Pottery
stone Clay Transmittance
(%) Plasticity
(%) Whiteness NB SB 4-1 40 12 18 20 8 2 58 24.05 0 4-2 40 12 16 20 8 4 58 24.55 0 4-3 40 12 14 20 8 6 58 25.35 0 4-4 40 12 12 20 8 8 5 25.88 0

Chemical composition of Test Example 4 SiO ₂ CaO P ₂ O ₅ KNaO Al ₂ O ₃ Fe ₂ O ₃ Ig.loss Ca / P 4-1 31.10 24.37 22.34 3.00 10.69 0.09 8.35 1.38 4-2 31.10 24.37 22.34 3.00 10.72 0.09 8.32 1.38 4-3 31.10 24.37 22.34 3.00 10.75 0.09 8.29 1.38 4-4 31.10 24.37 22.34 3.00 10.78 0.09 8.26 1.38

In Test Example 4, the formability and transmittance of Kaolin and Clay were compared, and the Kaolin content was adjusted to 20% or less to improve the transmittance. At this time, the plasticity was measured while increasing the amount of clay added, and the change in transmittance when clay was added was measured.

As a result, there was almost no change in permeability at 2 ~ 6% of the clay addition amount, and the plasticity value exceeded 25% when adding 6% of the clay, thereby improving the moldability. Addition of 8% or more of Clay became a factor of deterioration in permeability.

Test Example 5

Composition of Test Example 5 Boneash Lime
stone Kaolin Feldspar Pottery
stone Clay Transmittance
(%) Whiteness Formability Flower
(mm) Firing
Temperature NB SB 5-1 40 10 14 20 10 6 65 0 0 12.5 1260 ℃ 5-2 65 ? 0 18.4 1280 ℃ 5-3 40 12 14 20 8 6 60 0 0 7.6 1260 ℃ 5-4 65 0 0 11.4 1280 ℃ 5-5 40 15 14 20 5 6 58 0 0 4.0 1260 ℃ 5-6 63 0 0 6.5 1280 ℃ 5-7 40 20 14 20 - 6 55 0 ? 2.3 1260 ℃ 5-8 58 0 ? 4.2 1280 ℃

Chemical composition of Test Example 5 SiO ₂ CaO P ₂ O ₅ KNaO Al ₂ O ₃ Fe ₂ O ₃ Ig.loss Ca / P 5-1 33.89 23.25 22.34 3.00 9.96 0.09 7.37 1.32 5-2 33.89 23.25 22.34 3.00 9.96 0.09 7.37 1.32 5-3 31.10 24.37 22.34 3.00 10.75 0.09 8.29 1.38 5-4 31.10 24.37 22.34 3.00 10.75 0.09 8.29 1.38 5-5 27.26 26.04 22.34 3.00 11.59 0.09 9.33 1.48 5-6 27.26 26.04 22.34 3.00 11.59 0.09 9.33 1.48 5-7 21.09 28.84 22.34 3.00 13.00 0.09 11.64 1.63 5-8 21.09 28.84 22.34 3.00 13.00 0.09 11.64 1.63

In Test Example 5, changes in physical properties due to differences in firing temperatures were measured (1260 ° C & 1280 ° C). At this time, in order to improve the permeability, the permeability and the degree of chemical conversion were measured at 1260 ° C & 1280 ° C, and the appropriate calcination temperature and composition were checked by measuring various properties according to the Ca / P ratio change at each calcination temperature. In addition, the physical properties for each calcination temperature at the Ca / P ratio of 1.32 to 1.63 were measured.

As a result, the higher the Ca / P ratio, the lower the permeability and the degree of conversion, and the higher the firing temperature, the higher the permeability, but the lower the degree of conversion. The composition of 5-1,5-2,5-4,5-6 is more than 63%, which is the proper transmittance, but the composition of 5-1,5-2,5-4 is weak and has a low fire resistance, making it difficult to use as a light-transmitting substrate. In addition, the composition of the 5-8mm section, which is the appropriate degree of composition, showed 5-3,5-6 composition.

Therefore, as described above, the 5-6 composition at a firing temperature of 1280 ° C shows the best physical properties in terms of properties such as permeability, whiteness, formability, and chemical degree.

As described above, the present invention has been described and illustrated in connection with a preferred embodiment for illustrating the technical idea of the present invention, but the present invention is not limited to the configuration and operation as illustrated and described, without departing from the scope of the technical idea. Those skilled in the art will appreciate that many changes and modifications to the present invention are possible. Accordingly, all such suitable modifications and modifications and equivalents should be considered as falling within the scope of the present invention.

Claims (9)

TCP (Tricalcium Phosphate) crystal phase is a main crystal phase, anorthite crystal phase comprises a substrate that is a secondary crystal phase, the substrate is a light-transmitting porcelain composition, characterized in that calcined at 1270 to 1290 degrees.
According to claim 1,
The light-transmitting porcelain composition is 35 to 45% by weight of synthetic bone ash, 10 to 15% by weight of limestone, 12 to 14% by weight of kaolin, 18 to 20% by weight of Felds par, 3 to 5% by weight of Pottery Stone, Light-transmitting porcelain composition comprising 5 to 6% by weight of the composition component.
According to claim 1,
The substrate is composed of 25 to 32% by weight of SiO2, 22 to 27% by weight of CaO, 22 to 23% by weight of P2O5, 2.5 to 3.5% by weight of KNaO, 11 to 13% by weight of Al2O3, and 0.08 to 0.10% by weight of Fe2O3. Characterized by a translucent porcelain composition.
According to claim 3,
The light-transmitting porcelain composition, wherein the Ca / P ratio is 1.38 to 1.50.
According to claim 3,
The light-transmitting porcelain composition, characterized in that the content ratio of SiO2 to CaO in the substrate is 0.9 to 1.1.
The substrate is a light-transmitting porcelain composition further comprising a mullite crystal phase or a cuts crystal phase.
Mixing the ingredients in the first step and mixing the mixture at a second high speed;
Vacuum kneading the blended raw materials to produce a base having a TCP crystal phase as a main crystal phase and an Anorthite crystal phase as a secondary crystal phase;
Adding water to the TCP substrate, followed by high-speed stirring and low-speed stirring;
Injecting and forming a slurry into the stirred substrate; And
After drying the molded body; Including,
The firing step is a method of producing a light-transmitting porcelain composition, characterized in that the primary firing at 850 to 950 degrees, and the second firing by re-heating at 1270 to 1290 degrees.
The method of claim 7,
The possession is 35 to 45% by weight of synthetic bone ash, 10 to 15% by weight of limestone, 12 to 14% by weight of kaolin, 18 to 20% by weight of Felds par, 3 to 5% by weight of Potterystone, Cray 5 Method for producing a light-transmitting porcelain composition, characterized in that it consists of a composition component of 6 to 6% by weight.
The method of claim 8,
The substrate is composed of 25 to 32% by weight of SiO2, 22 to 27% by weight of CaO, 22 to 23% by weight of P2O5, 2.5 to 3.5% by weight of KNaO, 11 to 13% by weight of Al2O3, and 0.08 to 0.10% by weight of Fe2O3. Method for producing a translucent porcelain composition.

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