Glaze that does not inhibit the oxidation of the clay

Abstract

To provide a glaze that is less likely to develop blisters. 【Solution means】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) for 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); Al2O3 where 0.1 ≤ Al2O3 ≤ 0.6; SiO2 where 1 ≤ SiO2 ≤ 4; and B2O3 where B2O3 ≤ 1.

Description

[Technical Field]

[0001] This invention relates to glazes for ceramics. [Background technology]

[0002] Glaze is made by mixing various raw materials, mainly natural minerals, and heating them to create a glassy substance. However, the firing conditions (temperature and time) of the glaze vary depending on the base material, and the glaze is formulated to suit those conditions.

[0003] Glazes require time for each ingredient to melt and react with each other. To ensure a sufficiently long time for this reaction, one strategy is to lower the melting point of the glaze. The faster the firing process and the shorter the firing time, or the lower the firing temperature, the greater the need to use glazes with low melting points.

[0004] Patent documents 1 and 2 describe highly transparent glazes. Patent Document 3 describes a tile glaze that enables the manufacture of interior tiles without causing foaming even after a single firing, and which contains feldspar, clay, etc., along with specific amounts of various metal oxides. In the glaze described in the same document, the amount of frit (containing at least SiO2, Al2O3, CaO, alkali metal oxides, Zr2O3, B2O3, MgO, BaO, SrO, and ZnO, one or more of these) is 50 to 90 parts by weight relative to the total weight of components other than pigments. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2001-342087 [Patent Document 2] Japanese Patent Application Publication No. 08-165141 [Patent Document 3] Japanese Patent Application Publication No. 01-042342 [Overview of the project] [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 are completely burned 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 blackish, and the peripheral part becomes reddish, and a color difference may occur. When using a glaze with a low melting point (for example, 900°C or lower) to shorten the firing time, anko is likely to occur. In addition, the lower the hiding power of the glaze by color, the more it is affected by the base color, so it is easier to produce a color difference between the peripheral part and the central part of the base material, and thus it is 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 such base materials, the faster the firing, the easier anko is to occur.

[0007] Under the above background, in the present invention, an object is to provide a glaze in which anko is difficult 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 it is difficult to inhibit the supply of oxygen to the central part of the base material. The present inventors further found that by appropriately adjusting the selection of the components of the glaze and the mixing ratio of the components, there is a possibility that the above problems can be solved, 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] Glazes including the following in Seger notation: R 1 2O(R 1 (2O represents one or more of Li2O, Na2O, K2O, and KNaO) 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 defined as 0.1 ≤ Al2O3 ≤ 0.6; SiO2 is 1 ≤ SiO2 ≤ 4; and B2O3 ≤ 1 [2] The glaze described in [1] further comprises component F. [3] Glazes as described in [1] or [2], including the following in Seger notation: R 1 2O to R 1 2O ≤ 0.3; ZnO ≤ 0.5; 0.2 ≤ R 2 O; Al2O3 is defined as 0.1 ≤ Al2O3 ≤ 0.4; SiO2 is 1 ≤ SiO2 ≤ 2.5; and B2O3 is defined as B2O3 ≤ 0.5. [4] A glaze containing component F, as described in any of [1] to [3]. [5] A 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 composed of SiO2, Al2O3, CaO, alkali metal oxides, ZrO2, B2O3, and oxides of MgO, BaO, SrO, and ZnO. [6] A glaze according to any one of [1] to [5] for glazing and firing a body composed of raw materials containing carbonates, sulfides, and organic compounds. [7] The glaze according to any one of [1] to [6], wherein firing is performed 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 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 anko generation, including the following in Seger notation: R 1 2O (R 1 2O represents one or more of Li2O, Na2O, K2O, and KNaO) for 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); 0.1 ≤ Al2O3 ≤ 0.6 for Al2O3; 1 ≤ SiO2 ≤ 4 for SiO2; and B2O3 ≤ 1 for B2O3.

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

[10] as a material.

[0009] Although not bound by theory, the principle by which anko is less likely to occur in the glaze of the present invention is considered as follows. Anko may occur when the supply of oxygen to the organics contained in the substrate becomes insufficient, causing the substrate to carbonize and turn black, and the substrate containing iron also changes color from red to black. During the firing of the ceramic body, which is the raw material for porcelain, combustion CO2 gas is generated from the body. When the desired firing is performed as usual, a reddish color is obtained due to the coloration of reddish components such as Fe2O3. In contrast, the central part, which is covered with molten glaze, does not receive sufficient O2 and the firing proceeds in a reducing state, resulting in the generation of many black substances such as FeO and carbon components. It was considered that the color of these black substances causes the central part to become blackish, and the contrast with the red color of the periphery may cause a reddish color to appear. In the glaze of the present invention, the melting start temperature of the glaze is moderately high, so the reaction proceeds quickly after melting, and a longer time is ensured for the generation of reddish color components such as Fe2O3. Therefore, it is believed that the formation of reddish hues can be suppressed by using the glaze of the present invention. [Effects of the Invention]

[0010] The glaze of the present invention, compared to conventional glazes, is less likely to produce underglaze (reduces the amount of underglaze that forms) even with short firing times, or reduces the degree of underglaze that does occur. In other words, according to the present invention, color variations (poor color tone) due to the presence or absence of underglaze are reduced, and the yield of fired ceramics is improved (leading to waste reduction and a reduction in environmental impact). According to the present invention, rapid firing is possible, thereby improving production efficiency. Furthermore, by shortening the firing time, energy consumption per unit area of ​​production (combustion, electricity, etc.) can be reduced, resulting in a reduction in environmental impact.

[0011] In some embodiments of the glaze of the present invention, the following effects may be achieved: • While severe carbonization and remaining carbon in the substrate can hinder the sintering (bonding reaction) of the substrate, the glaze of the present invention is expected to prevent the deterioration of quality, such as strength, caused by the aforementioned insufficient reaction affecting the substrate. It is also possible to eliminate concerns about delamination between the glaze layer and the substrate over time, and the occurrence of crazing in the glaze layer due to reduced adhesion between the glaze layer and the substrate. Raising the melting point of the glaze not only increases the burning time of organic compounds, but also, in the case of carbonates and sulfuric acids, it allows time for them to escape as gases through thermal decomposition (this can eliminate problems such as irregular opacity (loss of gloss) or inhibition of glaze color development caused by residual sulfuric acids). Furthermore, by promoting the escape of sulfuric acid through gasification, the residual sulfides in the substrate can be reduced, which is expected to suppress efflorescence on the substrate surface. [Modes for carrying out the invention]

[0012] The following describes the components used in the present invention, their quantities, and their actions and functions, and provides a more detailed explanation of the present invention. In this specification, "less likely to cause lumps," "suppressed lumps," or "suppressed lumps" means that lumps are less likely to occur compared to other glazes, or that the occurrence of lumps is reduced.

[0013] The present invention relates to a glaze, as described above, comprising the following in Seger notation: R 1 2O(R 1 (2O represents one or more of Li2O, Na2O, K2O, and KNaO) 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 is defined as 0.1 ≤ Al2O3 ≤ 0.6; SiO2 is 1 ≤ SiO2 ≤ 4; and B2O3 ≤ 1 In this specification, the amounts of each component are expressed in Seger notation unless otherwise specified.

[0014] Of the above components, R 1 2O and B2O3 are components that lower the melting point of the glaze. 1It is used in quantities where 2O ≤ 0.4 and B2O3 ≤ 1. These components have the advantage of maintaining the glaze's melting point at a certain level, as well as suppressing the thermal expansion of the clay body and thus preventing the formation of crazing. Furthermore, these components are highly volatile, and their gases tend to fuse to products and furnaces, posing a safety problem. However, the glaze of the present invention can avoid such problems. The amount of B2O3 is not limited as long as it is within the range that achieves the desired effect of the present invention, with an upper limit of 1 mole and a lower limit of 0 moles as an example, or it may be 0.01 moles. The proportion of B2O3 in the total frit (including frits containing SiO2, Al2O3, CaO, alkali metal oxides, ZrO2, B2O3, and oxides of MgO, BaO, SrO, and ZnO) is not limited, and proportions greater than 2% by weight are exemplified. The source of B2O3 is not limited, and in addition to frit, B2O3-based raw materials may include glass powder and minerals (urexite, colemanite, boric acid, borax). The amount of B2O3 supplied from these sources is not limited, and the total amount supplied from B2O3-based raw materials may be 50% or less of the total supply of B2O3.

[0015] R 1 Therefore, the glaze of the present invention containing Li is preferred. This is because Li is suitable for maintaining the melting point of the glaze at a certain height while allowing the melting reaction of the glaze to proceed smoothly.

[0016] R in the glaze of the present invention 1 The amount of 2O is preferably 0.01 ≤ R 1 2O ≤ 0.4, and more preferably 0.02 ≤ R 1 2O ≤ 0.35, and even more preferably 0.05 ≤ R 1 2O ≤ 0.3. 1 Using 2O in these amounts not only achieves the desired color but also prevents crazing.

[0017] In this invention, alkali (R 1By reducing the amount of Al2O3 and / or SiO2, the thermal expansion of the glaze is reduced. Therefore, it is possible to reduce the amount of Al2O3 and / or SiO2, and to further accelerate the reaction of the glaze after melting. The proportion of SiO2 in the total frit is not limited, but is exemplified by a proportion of about 56% by weight or less, may be less than 55% by weight, and is preferably 50% by weight or less.

[0018] The raw materials used to supply the alkali metals 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 preferred, and feldspar is also preferred. Minerals containing lithium, such as petalite and spodumene, are particularly preferred as feldspar. This is because using these minerals ensures a more reliable supply of lithium, allowing the glaze melting reaction to proceed more smoothly without lowering the melting point.

[0019] In this invention, R is used as an auxiliary fluxing component. 2 O(R 2 Alkaline earth metal oxides (Ca, Mg, Sr, and / or Ba) are used. In this invention, ZnO is also used as an alkaline earth metal oxide in an amount of ZnO ≤ 0.65. The above alkaline earth metal oxides are the above R 1 Compared to 2O, it has less effect on the decrease in the melting point of the glaze, while R 1 This component has the effect of accelerating the melting reaction of glazes, which would not proceed sufficiently with 2O alone. R in the glaze of the present invention 2 O(R 2 The amounts of Ca, Mg, Sr, and / or Ba may be adjusted within a range that produces the desired effect in the present invention. 2 O(R 2 The amount of (=Ca, Mg, Sr, and / or Ba) may be, for example, 0.8 moles or less, and an amount of 0.7 moles or less is preferred. 2 As an example of the lower limit for the amount of O, 0 moles was given, and 0.01 moles was also acceptable. R 2 O(R 2=Ca, Mg, Sr, and / or Ba) preferably contains CaO. 2 The amount of CaO in the case of O containing CaO is not limited and may be, for example, 0.8 moles or less, and an amount of 0.7 moles or less is preferred. The proportion of CaO in the total frit is not limited, with examples including a proportion of 20% by weight or less, and may be less than 18% by weight, with 17% by weight or less being preferred. Reducing the amount of CaO is preferable because it contributes to a wider range of adjustability for the amounts of other components that include the color-developing 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 of the present invention that contains both CaO and ZnO is not limited, but an amount of 0.02 moles or more and 0.9 moles or less is exemplified, and an amount greater than 0.5 moles and 0.85 moles or less is preferred.

[0020] The glaze of the present invention contains ZnO as an alkaline earth metal oxide. The glaze of the present invention, by containing ZnO as an alkaline earth metal oxide, exhibits the effect of more strongly suppressing the formation of granules in addition to the effects of the glaze's melting reaction. The amount of ZnO is not limited as long as it is within the range that achieves the desired effect of the present invention, but the upper limit is 0.6 moles and the lower limit is 0.01 moles as an example.

[0021] The glaze of the present invention includes other components for controlling the melting of the glaze, Al2O3 is defined as 0.1 ≤ Al2O3 ≤ 0.6; SiO2 ≤ 1 ≤ SiO2 ≤ 4 include.

[0022] Al2O3 is a component that significantly affects both color development and 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; hereafter, 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, like Al2O3, is a component that controls the properties of the glaze. The amount of SiO2 in the glaze of the present invention 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 because they more reliably produce the desired effect: R 1 2O to R 1 2O ≤ 0.3; ZnO ≤ 0.5; 0.2 ≤ R 2 O; Al2O3 is defined as 0.1 ≤ Al2O3 ≤ 0.4; SiO2 is 1 ≤ SiO2 ≤ 2.5; and B2O3 is defined as B2O3 ≤ 0.5.

[0025] Among the glazes of the present invention, those containing F (fluorine) component are preferred. Glazes of the present invention containing F component can allow the melting reaction to proceed more smoothly while suppressing or not lowering the melting point. While the aforementioned F component is often used as a glass-based raw material, it may be added to the glaze of the present invention using an externally split raw material such as CaF2 (=fluorite). The amount of component F in the glaze of the present invention is not limited. The amount of component F is preferably 5% or less, and more preferably 3% or less, relative to the total weight of the glaze. Among the glazes of the present invention, glazes in which the weight ratio of frit to the total weight of the glaze is 50% by weight or less are preferred. Frit as used herein refers to frit containing SiO2, Al2O3, CaO, alkali metal oxides, ZrO2, B2O3, and oxides of MgO, BaO, SrO, and ZnO. Such frit may contain small amounts of components such as P2O5 and Bi2O3. Since a large amount of thermal energy is required to melt frit, which has a high melting point, a small proportion of frit in the glaze has the advantage of requiring less energy during manufacturing. Therefore, among the glazes according to the present invention, glazes in which the weight proportion of frit is 50% by weight or less are preferred because they have a relatively small amount of frit.

[0026] Among the glazes of the present invention, a glaze comprising the following components in Seger notation as the components of a conventional glaze is preferred: R 1 2O(R 1 (2O represents one or more of Li2O, Na2O, K2O, and KNaO) 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 is defined as 0.1 ≤ Al2O3 ≤ 0.6; SiO2 is 1 ≤ SiO2 ≤ 4; and B2O3 ≤ 1 This type of glaze can more effectively suppress the formation of bean paste.

[0027] A glaze containing, in addition to the above-mentioned glaze described in the previous paragraph, 5% or less of component F and / or 10% or less of a coloring agent or emulsion, and 20% or less of zircon silicate, relative to the total weight of the glaze, is preferred. That is, a glaze consisting of the above-mentioned components and 5% or less of component F and / or 10% or less of a coloring agent or emulsion, and 20% or less of zircon silicate, relative to the total weight of the glaze, is preferred. This is because, according to the glaze of the present invention, in which component F and / or zircon silicate as a coloring agent or emulsion is added in the above-mentioned range, the occurrence of lumps can be suppressed without relying solely on the hiding power of these components, and the color development by other components of the glaze can be maintained. Among these glazes, those containing 5% or less of component F relative to the total weight of the glaze can more reliably suppress the formation of lumps. Furthermore, among these glazes, those containing 20% ​​or less zircon silicate as a coloring agent or emulsion at a concentration of 10% or less relative to the total weight of the glaze offer the effect of enabling arbitrary coloring.

[0028] Among the glazes of the present invention, a glaze comprising the following components, as expressed in Seger notation, as a conventional glaze component is even more preferable: R 1 2O to R 1 2O ≤ 0.3; ZnO ≤ 0.5; 0.2 ≤ R 2 O; Al2O3 is defined as 0.1 ≤ Al2O3 ≤ 0.4; SiO2 is 1 ≤ SiO2 ≤ 2.5; and B2O3 is defined as B2O3 ≤ 0.5. This type of glaze can more effectively suppress the formation of bean paste.

[0029] A glaze further comprising the above-mentioned glaze described in the previous paragraph, with 5% or less of component F and / or 10% or less of a coloring agent or emulsion, comprising 20% ​​or less of zircon silicate, is also preferable. That is, a glaze consisting of the above-mentioned components and 5% or less of component F and / or 10% or less of a coloring agent or emulsion, comprising 20% ​​or less of zircon silicate, is also preferable. This is because, according to the glaze of the present invention, in which component F and / or zircon silicate as a coloring agent or emulsion is added in the above-mentioned range, the occurrence of lumps can be suppressed more reliably without relying solely on the hiding power of these components, and the color development by other glaze components can be maintained. Among these glazes, those containing 5% or less of component F relative to the total weight of the glaze can more reliably suppress the formation of lumps. Furthermore, among these glazes, those containing 20% ​​or less zircon silicate as a coloring agent or emulsion at a concentration of 10% or less relative to the total weight of the glaze offer the effect of enabling arbitrary coloring.

[0030] The body material on which the glaze of the present invention is used, that is, the molded material to which the glaze is applied and fired, is not limited. The glaze of the present invention is preferred for glazing and firing a body composed of raw materials containing carbonates, sulfides, and organic compounds. This is because, in the aforementioned body, the occurrence of granulation is particularly significantly suppressed by the glaze of the present invention compared to conventional glazes.

[0031] The firing temperature when firing the body using the glaze of the present invention is not limited. The glaze of the present invention is preferable if the firing is performed at a maximum temperature of approximately 1000°C to approximately 1200°C. The temperatures in the range of approximately 1000°C to 1200°C mentioned above are relatively low for firing the clay body compared to temperatures higher than 1200°C. Therefore, at temperatures in this range, firing does not proceed with glazes that have a high melting point, while glazes that have a very low melting point are prone to developing a paste-like structure. In contrast, with the glaze of the present invention, which has a suitable melting point, the clay body is sufficiently fired even at temperatures in this range, and the development of paste-like structures is suppressed. Therefore, among the glazes of the present invention, the glaze used for firing the body at a maximum temperature of approximately 1000°C to approximately 1200°C for a period of 4 hours or less is preferred.

[0032] The firing time when firing the body using the glaze of the present invention is not limited. The glaze of the present invention is preferable if the firing is carried out within 4 hours. Since this firing time of 4 hours or less is less than half the usual firing time of 8 hours or more, glazes with high melting points will not be fired sufficiently, and glazes with too low a melting point are prone to developing a paste-like structure. In contrast, with the glaze of the present invention, which has a suitable melting point, the body is fired sufficiently and the development of paste-like structures is suppressed.

[0033] <Other ingredients> The glaze of the present invention may contain or be blended with colorants used in the art. Examples of such colorants include metal oxides such as Co3O4, MnO2, and Fe2O3, as well as pigments such as black pigments, pink pigments, brown pigments, green pigments, and yellow pigments. The amount of these colorants is not limited as long as it does not hinder the objective of the present invention. Such an amount is, for example, equivalent to 10% or less of the total weight of the glaze, preferably 0.3% to 10%, and more preferably 0.3% to 5%. The glaze of the present invention may also be used as a coloring agent, such as an emulsion agent such as zircon silicate. The amount of emulsion agent is not limited as long as it does not hinder the purpose of the invention. Such an amount is, for example, equivalent to 20% or less by weight of the total weight of the glaze, preferably 18% or less, and more preferably 15% or less.

[0034] In addition, the glaze of the present invention may also contain P, Cu, Ti, V, Cr, Ni, Sn, Sb, Bi, Ta, Nb, Y, W, and Mo, which are commonly used as components of glazes, to the extent that they do not impair the effects of the present invention. The amounts of these components are not limited as long as they do not hinder the purpose of the present invention. Such amounts are, for example, equivalent to 3% to 5% or less by weight of the total weight of the glaze, and preferably 1% to 3%.

[0035] The glaze of the present invention may contain trace amounts of components other than those mentioned above, as these are components that are inevitably mixed in during the manufacturing process of the glaze, as long as they do not hinder the objectives of the present invention.

[0036] <Ceramics> The present invention also provides ceramics manufactured using any of the above glazes, and the manufacture of such ceramics can be carried out by conventional methods in the art at a relatively low firing temperature. Specifically, the firing temperature of the ceramics is approximately 1000°C to approximately 1200°C, the firing time is approximately 0.5 hours to approximately 4 hours, and the amount of glaze applied is 200g to 1500g / m². 2 As such, it is possible to manufacture ceramics. The method for manufacturing the ceramics of the present invention is not limited to this, and includes a method of applying the glaze of the present invention to a desired material.

[0037] The size of the ceramics or the base material for manufacturing ceramics according to the present invention is not limited. The area of ​​the ceramic or the aforementioned base material that can be identified from the top surface when laid flat is approximately 25 cm². 2 ~About 10000cm 2 Examples are given. [Examples]

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

[0039] Method for manufacturing test samples and testing methods A base material formed by vacuum extrusion molding of a mixture consisting of inorganic aggregate, clay, and organic binder is subjected to 700 g / m². 2 The glaze was applied, and the piece was fired at a predetermined temperature for a predetermined time. The glaze was formulated according to the components shown in the table below (expressed in Seger ratios), and the resulting glaze was wet-milled in a pot mill for 3 hours to obtain glaze slip. The particle size of this slip was 1-5% for particles 45 μm or larger. For the glazes of Examples 1 to 12, which are embodiments of the present invention, the condition of the body was evaluated by visual inspection to determine whether or not "anko" (a condition in which a color difference occurs between the center and the periphery of the body) occurred. On the other hand, Comparative Examples 1 to 4 were also prepared and evaluated as examples that do not have the configuration of the present invention. In all examples and comparative examples, the weight percentage of the frit was less than 50% by weight of the total weight of the glaze.

[0040] result The results are shown in the table below. These results clearly demonstrate that the glaze of the present invention has the effect of suppressing the formation of bean paste even when fired at low temperatures for a short time. [Table 1-1] [Table 1-2] [Table 1-3]

[0041] The table below shows reference examples (reference examples and reference comparative examples) related to the present invention. The presence or absence of red bean paste formation is described based on the results inferred from the component composition in each reference example. [Table 2] [Industrial applicability]

[0042] The method of the present invention makes it possible to provide glazes that surpass the performance of conventional products. Therefore, the present invention will greatly contribute to the development of the glaze manufacturing industry, the ceramic product manufacturing industry, and related industries.

Claims

1. Glazes including the following in Seger notation: R １ ２ O(R １ ２ O is Li ２ O, Na ２ O, K ２ O and one or more of KNaO) is represented by R １ ２ O ≤ 0.4; 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 to B ２ O ３ ≤ 1.

2. The glaze according to claim 1, comprising the following in Seger notation: R １ ２ O to R １ ２ O ≤ 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 to B ２ O ３ ≤0.

5.

3. The glaze consists of the following: (1) Using Seger notation, R １ ２ O(R) １ ２ O is Li ２ O, Na ２ O, K ２ R represents one or more of O and KNaO. １ ２ O ≤ 0.4; 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 to B ２ O ３ ≤ 1, and Component F at 5% or less relative to the total weight of the glaze and / or coloring agent at 10% or less or zircon silicate at 20% or less. or (2) Using Seger notation, R １ ２ O to R １ ２ O ≤ 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 to B ２ O ３ ≤0.5, Furthermore Component F at a concentration of 5% or less relative to the total weight of the glaze, and / or a coloring agent at a concentration of 10% or less, or zircon silicate at a concentration of 20% or less.

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

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

6. A glaze according to claim 1 or 3 for glazing and firing a body composed of raw materials containing carbonates, sulfides, and organic compounds.

7. The glaze according to claim 1 or 3, wherein the firing is performed at a maximum temperature of 1000°C to 1200°C.

8. The glaze according to claim 1 or 3, wherein firing is carried out within 4 hours.

9. A glaze according to claim 1 or 3 for use in firing a clay body at a maximum temperature of 1000°C to 1200°C for a period of 4 hours or less.

10. Glazes that suppress the formation of red pigment, including the following in Seger notation: R １ ２ O(R) １ ２ O is Li ２ O, Na ２ O, K ２ R represents one or more of O and KNaO. １ ２ O ≤ 0.4; 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 is B ２ O ３ ≤ 1

11. A method for manufacturing ceramics, comprising applying the glaze described in claim 1, 3, or 10 to a material.

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