Glaze that does not inhibit the oxidation of raw materials

Abstract

To provide a glaze in which fisheyes are less likely to occur. 【Solution means】A glaze containing the following in Seger notation: R 1 2O (where 1 R2O represents one or more of Li2O, Na2O, K2O, and KNaO)) for R 1 R2O ≤ 0.4; ZnO ≤ 0.65; 0 ≤ R 2 O (where 2 O represents one or more of CaO, MgO, SrO, and BaO)); 0.1 ≤ Al2O3 ≤ 0.6 for Al2O3; 1 ≤ SiO2 ≤ 4 for SiO2; and B2O3 ≤ 1 for B2O3.

Description

Technical Field

[0001] The present invention relates to a glaze for ceramics.

Background Art

[0002] A glaze is a substance that becomes glassy by mixing various raw materials mainly composed of natural minerals and applying heat. The firing conditions (temperature and time) etc. vary depending on the target substrate, and the glaze is formulated to suit those conditions.

[0003] The glaze requires time for each raw material to melt and react with each other. One measure to ensure a sufficiently long time for this is to lower the melting point of the glaze. The shorter the firing time or the lower the firing temperature, the higher the necessity of using a glaze with a lower melting point for firing.

[0004] Patent Documents 1 and 2 describe highly transparent glazes. Patent Document 3 describes a glaze for tiles that enables the production of interior tiles without causing a foaming phenomenon even in a single firing, which contains feldspar, clay, etc. together with specific amounts of various metal oxides. In the glaze in this document, the amount of frit (containing at least one or more of SiO2, Al2O3, CaO, oxides of alkali metals, Zr2O3, B2O3, MgO, BaO, SrO, and ZnO) is 50 to 90 parts by weight with respect to the total weight of the components other than the pigment.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, the organic substances in the base material start to burn at around 700°C during firing. However, if the glaze starts to melt before the organic substances burn out, the base material may carbonize and turn black. Such black portions are sometimes referred to as "anko (black core or black center)" in this technical field. When anko occurs, the central part of the surface of the base material turns black, resulting in a color difference between the central part and the peripheral part. That is, due to anko, the central part of the fired porcelain becomes a color with a black tint, and the peripheral part becomes a color with a red tint, and a color difference may occur. When using a glaze with a low melting point (for example, 900°C or less) to shorten the firing time, anko is likely to occur. In addition, the lower the hiding power of the glaze due to color, the more it is affected by the base color, so a color difference is likely to occur between the peripheral part and the central part of the base material, and thus it becomes difficult to obtain the intended color. Natural minerals such as clay contain a certain amount of organic substances. In addition, some base materials contain organic substances such as carbonates, sulfides, binders, and dispersants. Especially in the firing in the low temperature range for these base materials, the faster the firing, the more likely anko is to occur.

[0007] Under the above background, in the present invention, it is an object to provide a glaze in which anko is less likely to occur.

Means for Solving the Problems

[0008] In view of the above problems, the present inventors focused on making the melting point of the glaze not drop too much, and making the glaze such that after reaching the melting temperature (melting point), the reaction after melting proceeds rapidly and the supply of oxygen to the central part of the base material is not easily inhibited. The present inventors further found that by appropriately adjusting the selection of the components of the glaze and the blending ratio of the components, there is a possibility of solving the above problems, and as a result of further intensive research, the present invention has been completed. That is, the present invention relates to at least the following inventions: [1] A glaze containing the following in Seger notation: R 1 2O (where R 1 2O represents one or more of Li2O, Na2O, K2O, and KNaO) to R 1 2O ≤ 0.4; ZnO ≤ 0.65; 0 ≤ R 2 O (where R 2 O represents one or more of CaO, MgO, SrO, and BaO); 0.1 ≤ Al2O3 ≤ 0.6 for Al2O3; 1 ≤ SiO2 ≤ 4 for SiO2; and B2O3 ≤ 1 for B2O3. [2] The glaze according to [1], further containing an F component. [3] A glaze according to [1] or [2], containing the following in Seger notation: R 1 2O to R 1 2O ≤ 0.3; ZnO ≤ 0.5; 0.2 ≤ R 2 O; 0.1 ≤ Al2O3 ≤ 0.4 for Al2O3; 1 ≤ SiO2 ≤ 2.5 for SiO2; and B2O3 ≤ 0.5 for B2O3. [4] The glaze according to any one of [1] to [3], further containing an F component. [5] The glaze according to any one of [1] to [4], wherein the weight ratio of frit to the total weight of the glaze is 50% by weight or less; provided that the frit is a frit composed of SiO2, Al2O3, CaO, oxides of alkali metals, ZrO2, B2O3, and oxides of MgO, BaO, SrO, and ZnO. [6] The glaze according to any one of [1] to [5], for glazing and firing a substrate composed of a raw material containing carbonates, sulfides, and a raw material containing organics. [7] The glaze according to any one of [1] to [6], wherein the firing is firing at a temperature of 1000°C to 1200°C as the maximum temperature. [8] The glaze according to any one of [1] to [7], wherein the firing is performed within 4 hours. [9] The glaze according to any one of [1] to [8], which is used for firing a substrate within 4 hours at a temperature of 1000°C to 1200°C as the maximum temperature.

[10] A glaze with suppressed occurrence of ancho, including the following in Seger notation: R 1 2O (R 1 2O represents one or more of Li2O, Na2O, K2O, and KNaO) to R 1 2O ≤ 0.4; ZnO ≤ 0.65; 0 ≤ R 2 O (R 2 O represents one or more of CaO, MgO, SrO, and BaO); Al2O3 is 0.1 ≤ Al2O3 ≤ 0.6; SiO2 is 1 ≤ SiO2 ≤ 4; and B2O3 is B2O3 ≤ 1.

[11] A method for manufacturing ceramics, including applying a glaze according to any one of [1] to

[10] to a material.

[0009] Although not bound by theory, the principle by which ancho is less likely to occur in the glaze of the present invention is considered as follows. Ancho may occur when the supply of oxygen to the organics contained in the substrate becomes insufficient, the substrate carbonizes and turns black, and the substrate containing iron also changes color from red to black. During the firing of the base material, which is the raw material of ceramics and the object of firing, combustion CO2 gas is generated from the base material. When normal desired firing is performed, a reddish color is obtained by the coloring of components that develop a red color, such as Fe2O3. On the other hand, in the central part covered with the melted glaze, sufficient O2 is not supplied and the firing proceeds while remaining in a reduced state. As a result, the generation of black substances such as FeO and carbon components increases, and the central part becomes blackish due to the color of these black substances, and it was considered that anko might occur as a contrast to the red color of the peripheral part. In the glaze of the present invention, since the melting start temperature of the glaze is moderately high, the reaction after melting proceeds rapidly, and a longer time can be ensured for generating components that develop a red color, such as Fe2O3. Therefore, it is considered that the occurrence of anko can be suppressed by using the glaze of the present invention.

Advantages of the Invention

[0010] The glaze of the present invention has the effect of making it difficult for anko to occur even during short-time firing or reducing the degree of anko that occurs, as compared with conventional glazes. That is, according to the present invention, color bleeding (color tone defect) due to the presence or absence of anko is reduced, and the yield of fired ceramics is improved (leading to waste reduction and environmental load reduction). According to the present invention, rapid firing becomes possible, so the production efficiency is improved. In addition, by shortening the firing time, the energy consumption (combustion, electricity, etc.) per unit production area can be reduced, and the effect of reducing the environmental load can also be achieved.

[0011] Among the glazes of the present invention, in a certain aspect, the following effects may also be achieved: · When carbonization is severe and carbon remains in the base material, it hinders the sintering (bonding reaction) of the base material. On the other hand, in the glaze of the present invention, an effect of preventing a decrease in quality such as strength due to the insufficient reaction that affects the base material side can also be expected. It is also possible to eliminate concerns about delamination over time and the occurrence of penetration of the glaze layer due to a decrease in the adhesion between the glaze layer and the base material. · By raising the melting point of the glaze, not only can the combustion time of organic substances be increased. When carbonates and sulfates are included, the time for escaping as gas through thermal decomposition can also be increased (if sulfates adhere and remain, it may cause irregular opacification (loss of luster) or inhibit the color development of the glaze, but such problems can be solved). · Also, by promoting the dissipation due to the gasification of sulfates and reducing the residue of sulfides in the substrate, suppression of the efflorescence phenomenon on the substrate surface can also be expected.

Embodiments for Carrying out the Invention

[0012] Hereinafter, the components, amounts of components, and actions / functions used in the present invention will be described to explain the present invention in more detail. In this specification, "it is difficult for anchor to occur" or "the occurrence of anchor is suppressed" or "the occurrence of anchor is suppressed" means that the occurrence of anchor is less likely to occur compared to other glazes, or the occurrence of anchor is reduced.

[0013] As described above, the present invention relates to a glaze including the following in Seger notation: R 1 2O (R 1 2O represents one or more of Li2O, Na2O, K2O, and KNaO) in R 1 2O ≤ 0.4; ZnO ≤ 0.6; 0 ≤ R 2 O (R 2 O represents one or more of CaO, MgO, SrO, and BaO); Al2O3 where 0.1 ≤ Al2O3 ≤ 0.6; SiO2 where 1 ≤ SiO2 ≤ 4; and B2O3 where B2O3 ≤ 1. Note that the amounts of the respective components in this specification are the amounts represented by Seger notation unless otherwise specified.

[0014] Among the above components, R 1 2O and B2O3 are components that lower the melting point of the glaze. Respectively, R 1It is used in an amount of 2O ≤ 0.4 and B2O3 ≤ 1. These components have the advantage of keeping the melting point of the glaze at a certain level, and also have the advantage of suppressing the thermal expansion of the substrate to suppress the occurrence of penetration. In addition, these components have high volatility, and there is a problem in safety that the gas is likely to adhere to the product and the furnace. However, in the glaze of the present invention, such a problem can also be avoided. The amount of B2O3 is not limited as long as it is within the range that exhibits the desired effect of the present invention. The upper limit value is 1 mol, and the lower limit value is exemplified by 0 mol and may be 0.01 mol. The proportion of B2O3 in the entire frit (frit containing oxides of SiO2, Al2O3, CaO, alkali metal oxides, ZrO2, B2O3, and oxides of MgO, BaO, SrO, and ZnO) is not limited, and a proportion greater than 2% by weight is exemplified. The source of B2O3 is not limited. In addition to the frit, it may be glass powder or minerals (urexite, colemanite, boric acid, borax) as the B2O3-based raw material. The amount of B2O3 provided from these sources of B2O3 is not limited, and the supply amount from the B2O3-based raw material may be 50% or less of the total supply amount of B2O3 in total.

[0015] R 1 As R, the glaze of the present invention containing Li is preferable. This is because Li is suitable for smoothly progressing the melting reaction of the glaze while keeping the melting point of the glaze at a certain level.

[0016] R2O in the glaze of the present invention 1 The amount is preferably 0.01 ≤ R 1 2O ≤ 0.4, more preferably 0.02 ≤ R 1 2O ≤ 0.35, even more preferably 0.05 ≤ R 1 2O ≤ 0.3. By using R 1 2O in these amounts, not only the desired color development is achieved, but also penetration is prevented.

[0017] In the present invention, alkali (R 1By reducing the amount of (2O), the thermal expansion of the glaze becomes smaller. Therefore, it is possible to reduce the amount of Al2O3 and / or SiO2, and it is possible to further promote the reaction of the glaze after melting. The proportion of SiO2 in the whole frit is not limited, and a proportion of about 56% by weight or less is exemplified, and it may be less than 55% by weight, and an amount of 50% by weight or less is preferable.

[0018] The raw materials for supplying the alkali metals used in the glaze of the present invention are not limited. As such raw materials, glass-based raw materials such as frit are highly versatile and preferable, and feldspar is also preferable. As feldspar, minerals such as petalite and spodumene containing Li are particularly preferable. By using these minerals, Li can be supplied more reliably, and the melting reaction of the glaze can proceed more smoothly without lowering the melting point.

[0019] In the present invention, as an auxiliary flux component, R 2 O (R 2 = Ca, Mg, Sr, and / or Ba) alkaline earth metal oxides are used. In the present invention, as the alkaline earth metal oxide, ZnO is also used in an amount of ZnO ≤ 0.65. The above alkaline earth metal oxides have a small effect on lowering the melting point of the glaze compared to the above R 1 2O, while having an action of promoting the melting reaction of the glaze that does not proceed sufficiently with only R 1 2O. The amount of R 2 O (R 2 = Ca, Mg, Sr, and / or Ba) in the glaze of the present invention may be adjusted within a range that exhibits the desired effects in the present invention. The amount of R 2 O (R 2 = Ca, Mg, Sr, and / or Ba) may be, for example, 0.8 mol or less, and an amount of 0.7 mol or less is preferable. As the lower limit value of the amount of R 2 O, 0 mol is exemplified, and it may be 0.01 mol. R 2 O (R 2As (Ca, Mg, Sr, and / or Ba), those containing CaO are preferred. R 2 When RO contains CaO, the amount of CaO is not limited and may be, for example, 0.8 mol or less, and an amount of 0.7 mol or less is preferred. The proportion of the amount of CaO in the entire frit is not limited, and a proportion of 20% by weight or less is exemplified, and it may be less than 18% by weight, and an amount of 17% by weight or less is preferred. Reducing the amount of CaO is preferred because it contributes to widening the adjustable range for the amounts of other components including the coloring component. Among the glazes of the present invention, those containing both CaO and ZnO are preferred. The total amount of CaO and ZnO in the glaze containing both CaO and ZnO as the glaze of the present invention is not limited, and an amount of 0.02 mol or more and 0.9 mol or less is exemplified, and an amount greater than 0.5 mol and 0.85 or less is preferred.

[0020] The glaze of the present invention contains ZnO as an alkaline earth metal oxide. By containing ZnO as an alkaline earth metal oxide in the glaze of the present invention, the effect of suppressing the generation of anchor is further enhanced by emphasizing the action of the melting reaction of the glaze. The amount of ZnO is not limited as long as it is within the range that exhibits the desired effect of the present invention, the upper limit value is 0.6 mol, and 0.01 mol is exemplified as the lower limit value.

[0021] The glaze of the present invention contains, as other components for controlling the melting of the glaze Al2O3 such that 0.1 ≤ Al2O3 ≤ 0.6; SiO2 such that 1 ≤ SiO2 ≤ 4 is included.

[0022] Al2O3 is a component that affects color development and also has a great influence on melting. The amount of Al2O3 in the glaze of the present invention is 0.1 ≤ Al2O3 ≤ 0.6 (0.1 or more and 0.6 or less. Hereinafter, the notation using "~" in this specification has the same meaning). Preferably, 0.1 ≤ Al2O3 ≤ 0.5, and more preferably, 0.1 ≤ Al2O3 ≤ 0.4.

[0023] SiO2 is a component that controls the properties of the glaze, similar to the Al2O3 component. In the glaze of the present invention, the amount of SiO2 is 1 ≤ SiO2 ≤ 4, preferably 1 ≤ SiO2 ≤ 3.5, and more preferably 1 ≤ SiO2 ≤ 3.

[0024] Among the glazes of the present invention, glazes containing the following in Seger notation are preferred in order to more surely achieve the desired effects: R 1 2O for R 1 2O ≤ 0.3; ZnO ≤ 0.5; 0.2 ≤ R 2 O; Al2O3 where 0.1 ≤ Al2O3 ≤ 0.4; SiO2 where 1 ≤ SiO2 ≤ 2.5; and B2O3 where B2O3 ≤ 0.5.

[0025] Among the glazes of the present invention, those containing an F (fluorine) component are preferred. The glazes of the present invention containing an F component can make the melting reaction proceed more smoothly while suppressing a decrease in the melting point or without decreasing the melting point. Since the F component is often used as a raw material for the glass system, an external addition raw material such as CaF2 (= fluorite) may be added to the glaze of the present invention. The amount of the F component in the glaze of the present invention containing the F component is not limited. The amount of the F component is preferably 5% or less, and more preferably 3% or less, based on the weight of the entire glaze. Among the glazes of the present invention, glazes in which the weight ratio of frit to the weight of the entire glaze is 50% by weight or less are preferred. The frit in this specification is a frit containing oxides of SiO2, Al2O3, CaO, alkali metal oxides, ZrO2, B2O3, and oxides of MgO, BaO, SrO, and ZnO. Such frit may contain a small amount of components such as P2O5 and Bi2O3. Since a great deal of thermal energy is required to melt frit with a high melting point, a small frit blending ratio has the advantage of requiring less energy during production. Therefore, among the glazes according to the present invention, a glaze with a frit weight ratio of 50% by weight or less is preferable because the blending amount of frit is relatively small.

[0026] Among the glazes of the present invention, as components of ordinary glazes, glazes composed of the following components in Seger notation are preferable: R 1 2O (R 1 2O represents one or more of Li2O, Na2O, K2O, and KNaO) to R 1 2O ≦ 0.4; ZnO ≦ 0.6; 0 ≦ R 2 O (R 2 O represents one or more of CaO, MgO, SrO, and BaO); 0.1 ≦ Al2O3 ≦ 0.6 for Al2O3; 1 ≦ SiO2 ≦ 4 for SiO2; and B2O3 ≦ 1 for B2O3. According to such a glaze, the generation of anchor can be more reliably suppressed.

[0027] A glaze further containing an F component of 5% or less and / or 20% or less of zirconium silicate as a colorant or opacifier of 10% or less based on the weight of the entire glaze, that is, a glaze composed of the above components and an F component of 5% or less and / or 20% or less of zirconium silicate as a colorant or opacifier of 10% or less based on the weight of the entire glaze is preferable. According to the glaze of the present invention to which the F component and / or zirconium silicate as a colorant or opacifier is added in the amount within the above range, the generation of anchor can be suppressed without relying only on the masking power against anchor by these components, and the color development by other glaze components can be maintained. Among these glazes, according to a glaze containing an F component of 5% or less based on the weight of the entire glaze, the generation of anchor can be more reliably suppressed. In addition, among these glazes, a glaze containing zirconium silicate of 20% or less as a colorant or opacifier of 10% or less based on the total weight of the glaze also exhibits the effect of enabling arbitrary coloring.

[0028] Among the glazes of the present invention, a glaze composed of the following components according to the Seger notation as the components of a normal glaze is more preferable: R 1 2O with R 1 2O ≦ 0.3; ZnO ≦ 0.5; 0.2 ≦ R 2 O; For Al2O3, 0.1 ≦ Al2O3 ≦ 0.4; For SiO2, 1 ≦ SiO2 ≦ 2.5; and For B2O3, B2O3 ≦ 0.5. According to such a glaze, the generation of anko can be more surely suppressed.

[0029] A glaze further containing an F component of 5% or less and / or zirconium silicate of 20% or less as a colorant or opacifier of 10% or less based on the total weight of the glaze described in the previous paragraph, that is, a glaze composed of the above components and an F component of 5% or less and / or zirconium silicate of 20% or less as a colorant or opacifier of 10% or less based on the total weight of the glaze is also preferable. According to the glaze of the present invention to which the F component and / or zirconium silicate as a colorant or opacifier is added in the amounts within the above ranges, the generation of anko can be more surely suppressed without depending only on the concealing power against anko by these components, and the color development by the components of other glazes can be maintained. Among these glazes, a glaze containing an F component of 5% or less based on the total weight of the glaze can more surely suppress the generation of anko. In addition, among these glazes, a glaze containing zirconium silicate of 20% or less as a colorant or opacifier of 10% or less based on the total weight of the glaze also exhibits the effect of enabling arbitrary coloring.

[0030] The substrate on which the glaze of the present invention is used, that is, the formed material on which the glaze is applied and fired, is not limited. The glaze of the present invention is preferable for glazing and firing a substrate composed of a raw material containing a carbonate, a sulfide, and a raw material containing organic substances. This is because, in the said substrate, the generation of anchor is suppressed remarkably especially compared with the conventional glaze by the glaze of the present invention.

[0031] The firing temperature when firing the substrate using the glaze of the present invention is not limited. The glaze of the present invention is preferably fired at a temperature of about 1000°C to about 1200°C at the highest temperature. The temperature in the range of about 1000°C to about 1200°C is relatively low as the firing temperature of the substrate compared with a temperature higher than 1200°C. Therefore, in the temperature range, firing does not progress with a glaze having a high melting point, while anchor is likely to occur with a glaze having too low a melting point. On the other hand, in the glaze of the present invention having a suitable melting point, the substrate is sufficiently fired even at the temperature in the above range, and the generation of anchor is suppressed. Therefore, among the glazes of the present invention, a glaze for firing a substrate at a temperature of about 1000°C to about 1200°C at the highest temperature within 4 hours is preferable.

[0032] The firing time when firing the substrate using the glaze of the present invention is not limited. The glaze of the present invention is preferably fired within 4 hours. Since the firing time within 4 hours is a short firing time that is less than half of the normal firing time of 8 hours or more, sufficient firing is not performed with a glaze having a high melting point, and anchor is likely to occur with a glaze having too low a melting point. On the other hand, in the glaze of the present invention having a suitable melting point, the substrate is sufficiently fired, and the generation of anchor is suppressed.

[0033] <Other components> Colorants used in the technical field may be added or incorporated into the glaze of the present invention. Examples of such colorants include metal oxides such as Co3O4, MnO2, and Fe2O3, black pigments, pink pigments, brown pigments, green pigments, and yellow pigments. The amounts of these colorants are not limited as long as they do not inhibit the object of the present invention. Such amounts are, for example, amounts corresponding to 10% or less by weight based on the total weight of the glaze, preferably amounts of 0.3% to 10%, and more preferably amounts of 0.3% to 5%. In the glaze of the present invention, opacifying agents such as zircon silicate can also be used as colorants. The amount of the opacifying agent is not limited as long as it does not inhibit the object of the invention. Such amounts are, for example, amounts corresponding to 20% or less by weight based on the total weight of the glaze, preferably 18% or less, and more preferably 15% or less.

[0034] In addition, P, Cu, Ti, V, Cr, Ni, Sn, Sb, Bi, Ta, Nb, Y, W, Mo, etc., which are generally used as components of the glaze, can also be added to the glaze of the present invention as long as the effects of the present invention are not impaired. The amounts of these components are not limited as long as they do not inhibit the object of the present invention. Such amounts are, for example, amounts corresponding to 3% to 5% or less by weight based on the total weight of the glaze, preferably amounts of 1% to 3%.

[0035] The glaze of the present invention may contain trace amounts of components other than those described above as components inevitably mixed in the manufacturing process of the glaze as long as the object of the present invention is not inhibited.

[0036] <Ceramics> The present invention also provides a ceramic manufactured using any of the above glazes. The manufacture of the ceramic can be carried out by a conventional method in the technical field at a relatively low firing temperature. That is, the firing temperature of the ceramic is about 1000 °C to about 1200 °C, the firing time is about 0.5 hours to about 4 hours, and the amount of glaze adhesion is 200 g to 1500 g / m 2 and thus the ceramic can be manufactured. The method for manufacturing the ceramics of the present invention is not limited, and includes a method of applying the glaze of the present invention to a desired material.

[0037] The size of the base material for manufacturing the ceramics or the ceramics of the present invention is not limited. When the ceramics of the present invention or the base material are placed flat, the area specified from the upper surface is about 25 cm 2 ~ about 10,000 cm 2 is exemplified.

Example

[0038] Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples in any sense.

[0039] Method for manufacturing test sample and test method To a base material formed by vacuum extrusion molding of a kneaded material composed of an inorganic aggregate, a clay material, and an organic binder, a glaze of 700 g / m 2 was applied, and fired at a predetermined temperature for a predetermined time. The glaze was formulated to have the components shown in the following table (expressed by the Seger ratio), and the obtained glaze was wet pulverized with a pot mill for 3 hours to obtain a glaze slip. The particle size of this slip was such that 1 to 5% was 45 μm or more. Regarding the glazes of Examples 1 to 12, which are examples having the configuration of the present invention, the evaluation of the presence or absence of the occurrence of anko (a state in which a color difference occurs between the central part and the peripheral part of the base material) was visually performed as the state of the base material. On the other hand, Comparative Examples 1 to 4 were also prepared and evaluated as examples not having the configuration of the present invention. In any of the examples and comparative examples, the weight ratio of the frit was less than 50% by weight based on the total weight of the glaze.

[0040] Results As shown in the following table. From these results, it was clarified that the glaze of the present invention has the effect of suppressing the occurrence of anko even in firing for a short time at a low temperature.

Table 1-1

Table 1-2

Table 1-3

[0041] The following table shows reference examples (reference examples and reference comparative examples) related to the present invention. The presence or absence of anchor generation was described as the result inferred from the component composition in each reference example.

Table 2

Industrial Applicability

[0042] According to the method of the present invention, it is possible to provide a glaze that exceeds the performance of conventional products. Therefore, the present invention greatly contributes to the development of the glaze manufacturing industry, the porcelain product manufacturing industry, and related industries.

Claims

1. Glazes with the Segel notation, including: R １ ２ O (R １ ２ O is Li ２ O, Na ２ O.K. ２ represents one or more of O and KNaO) １ ２ O ≤ 0.4; ZnO: 0.3≦ZnO≦0.65; 0≦R ２ O (R ２ O represents one or more of CaO, MgO, SrO and BaO; Al ２ O ３ を0.1≦Al ２ O ３ ≦0.6; SiO ２ 1≦SiO ２ ≦4; and B ２ O ３ 0.15≦B ２ O ３ <= 1.

2. The glaze of claim 1 comprising, in Segel notation: R １ ２ O to R １ ２ O ≦ 0.3; ZnO: 0.3≦ZnO≦0.5; 0.2≦R ２ O; Al ２ O ３ を0.1≦Al ２ O ３ ≦0.4; SiO ２ 1≦SiO ２ ≦2.5; and B ２ O ３ 0.15≦B ２ O ３ <0.

5.

3. Glaze consisting of: (1) In Segel notation, R １ ２ O (R １ ２ O is Li ２ O, Na ２ O.K. ２ represents one or more of O and KNaO) １ ２ O ≤ 0.4; ZnO: 0.3≦ZnO≦0.6; 0≦R ２ O (R ２ O represents one or more of CaO, MgO, SrO and BaO; Al ２ O ３ を0.1≦Al ２ O ３ ≦0.6; SiO ２ 1≦SiO ２ ≦4; and B ２ O ３ 0.15≦B ２ O ３ ≦1, and 5% or less of F component and / or 10% or less of coloring agent or 20% or less of zirconium silicate based on the total weight of the glaze; or (2) In Segel notation, R １ ２ O to R １ ２ O ≦ 0.3; ZnO: 0.3≦ZnO≦0.5; 0.2≦R ２ O; Al ２ O ３ を0.1≦Al ２ O ３ ≦0.4; SiO ２ 1≦SiO ２ ≦2.5; and B ２ O ３ 0.15≦B ２ O ３ ≦0.5, And The glaze contains up to 5% F component and / or up to 10% coloring agent or up to 20% zirconium silicate by weight of the total glaze.

4. The glaze according to claim 1 or 3, further comprising an F component.

5. 4. A glaze according to claim 1 or 3, wherein the weight ratio of the frit to the total weight of the glaze is 50% by weight or less; provided that the frit is selected from the group consisting of SiO ２ , Al ２ O ３ , CaO, oxides of alkali metals, ZrO ２ , B ２ O ３ and a frit composed of oxides of MgO, BaO, SrO and ZnO.

6. The glaze according to claim 1 or 3, which is intended for application to and firing on a base material composed of a raw material containing carbonates, sulfides, and an organic material.

7. The glaze according to claim 6, wherein the firing is at a maximum temperature of 1000°C to 1200°C.

8. The glaze of claim 6, wherein the firing is carried out for 4 hours or less.

9. 4. A glaze according to claim 1 or 3 for use in firing a body at a maximum temperature of 1000°C to 1200°C for a period not exceeding 4 hours.

10. Glazes with reduced bean formation, including the following in the Segel notation: R １ ２ O (R １ ２ O is Li ２ O, Na ２ O.K. ２ represents one or more of O and KNaO) １ ２ O ≤ 0.4; ZnO: 0.3≦ZnO≦0.65; 0≦R ２ O (R ２ O represents one or more of CaO, MgO, SrO and BaO; Al ２ O ３ を0.1≦Al ２ O ３ ≦0.6; SiO ２ 1≦SiO ２ ≦4; and B ２ O ３ 0.15≦B ２ O ３ <= 1.

11. A method for producing ceramics, comprising applying the glaze according to claim 1, 3 or 10 to a material.

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