Jade glaze suitable for ultra-high temperature firing and preparation method thereof, ceramics using the jade glaze and preparation method thereof

Abstract

The present invention relates to the technical field of jade glaze for daily art ceramics, and in particular to a jade glaze suitable for ultra-high temperature firing and a preparation method thereof, ceramics using the jade glaze and a preparation method thereof. By weight, the jade glaze suitable for ultra-high temperature firing includes the following raw materials mixed and ball-milled: 18-25 parts of Sanbao porcelain stone, 26-35 parts of quartz, 15-20 parts of kaolin, 6-9 parts of turquoise, 17-22 parts of glaze fruit and 1.3-1.7 parts of mullite refractory fiber. Mullite refractory fiber is introduced into the raw material to improve the viscosity of the glaze at ultra-high firing temperature, so that the jade glaze maintains low rheology at ultra-high temperature (1380-1410°C), and can present a stable appearance decorative effect, and can maintain the stability of coloration in both oxidizing and reducing atmospheres, has a wide firing range, a high yield rate / excellent product rate, a high hardness, and good stain resistance, and has high aesthetic value and economic significance. The jade glaze is particularly suitable for the preparation of daily art ceramics.

Description

Technical Field

[0001] The invention relates to the technical field of jade glazes for daily-use artistic ceramics, and in particular to a jade glaze suitable for ultra-high temperature firing and a preparation method thereof, and ceramics using the jade glaze and a preparation method thereof. Background Art

[0002] Jingdezhen porcelain has been famous since ancient times, among which the four traditional famous porcelains represented by "blue and white", "famille rose", "exquisite" and "colored glaze" are the best. Traditional colored glaze is made of feldspar glaze or alkaline earth metal as the main raw material, typically "gray glaze" made by mixing calcined limestone and plant ash after precipitation and aging, the main component of which is calcium oxide (CaO>10%, Na2O+K2O<3.9%), and this glaze is mostly fired at around 1300℃.

[0003] With the improvement of people's artistic level and living standards, the demand for high-temperature hard porcelain is becoming more and more urgent. Higher firing temperature corresponds to better porcelain effect, but the problem that comes with it is that the corresponding ceramic firing stability is extremely poor and the excellent rate is not high, which has become an important limiting factor for the development of this high-end fine ceramics.

[0004] When the firing temperature is greater than 1350°C, conventional "grey glaze" will be overfired, and it is difficult to obtain a glaze surface quality as smooth as jade by conventional methods of increasing the glaze firing temperature such as increasing the alumina content. In particular, for some artistic porcelain products with thicker glaze and placed vertically, if fired at a firing temperature greater than 1350°C, the glaze must have a suitable high-temperature viscosity to ensure that it has fine flow, no "glaze accumulation" and no pinhole glaze defects. This is the core problem that the present invention needs to solve. Summary of the invention

[0005] The main purpose of the present invention is to provide a jade glaze suitable for ultra-high temperature firing and a preparation method thereof, a ceramic using the jade glaze and a preparation method thereof, aiming to improve the technical problems of the existing high-temperature hard porcelain firing stability being extremely poor and the quality rate being low.

[0006] To achieve the above-mentioned purpose, the present invention proposes a jade glaze suitable for ultra-high temperature firing, which is obtained by mixing and ball-milling the following raw materials, by weight: 18-25 parts of Sanbao porcelain stone, 26-35 parts of quartz, 15-20 parts of kaolin, 6-9 parts of turquoise, 17-22 parts of glaze fruit and 1.3-1.7 parts of mullite refractory fiber.

[0007] The present invention provides a stable ultra-high temperature jade glaze, which is particularly suitable for the preparation of daily-use porcelain and art porcelain. It should be particularly pointed out that conventional ceramic tiles are mostly laid flat during production, and the glaze needs to have good fluidity to better spread on the surface of the ceramic tile. The jade glaze of this solution is used on daily-use porcelain / art porcelain, which is mostly placed vertically during production, and the shape structure is more complex than traditional ceramic tiles. Therefore, the glaze needs to maintain a moderate viscosity to ensure that it is not easy to flow and accumulate under the ceramic product during the ultra-high temperature firing process, but is evenly spread on the surface of the blank, so that the "glaze accumulation" phenomenon will not be formed, so that the glaze decoration effect of the ceramic product is better.

[0008] Specifically, mullite refractory fiber is introduced to increase the viscosity of the glaze at ultra-high temperature, and "mullite-alkali-alkaline earth metal glaze" is used instead of traditional gray glaze or widely used feldspar glaze. Since mullite refractory fiber has high high-temperature viscosity and a needle-like structure, it can reduce the fluidity of the glaze at ultra-high temperature. At the same time, this scheme also adds turquoise ore instead of talc as raw materials, and the remaining raw materials include Sanbao porcelain stone, quartz, kaolin and glaze fruit. The combination of the above raw materials can significantly improve the high-temperature rheological effect of ultra-high temperature ceramic glaze, so that the jade glaze can withstand ultra-high firing temperature, and can still maintain low rheology under ultra-high temperature firing conditions, and still present a stable micro-green or flesh-red (glaze coloring effect) decorative effect in an oxidizing or reducing atmosphere. The ceramic has a transparent texture like jade, and the ceramics produced have a high yield rate and high aesthetic value and economic significance.

[0009] The turquoise used in this scheme is purchased from Zhushan County, Shiyan City, Hubei Province; the mullite refractory fiber used in this scheme is wear-resistant fiber cotton, produced in Deqing County, Huzhou City, Zhejiang Province. Since the mullite refractory fiber is mainly used to increase the viscosity of the glaze at ultra-high firing temperature, the jade glaze has better stability at ultra-high temperature, has low rheological properties, and the glaze color is more stable.

[0010] Preferably, the chemical composition of the Sanbao porcelain stone includes, by mass percentage, the following: SiO2 71.33-74.71%, Al2O3 14.62-15.41%, CaO 0.56-0.71%, MgO 0.13-0.17%, K2O 3.89-4.13%, Na2O 3.46-3.83% and loss on ignition 1.05-1.19%;

[0011] The chemical composition of the glaze fruit includes, by mass percentage, SiO2 74.43-75.02%, Al2O3 14.63-14.87%, CaO 1.52-1.97%, MgO 0.16-0.21%, K2O 2.90-3.11%, Na2O 2.37-2.39% and loss on ignition 2.28-2.85%.

[0012] When the Sanbao porcelain stone and glaze fruit in this scheme adopt the above-mentioned chemical composition, the obtained (jade glaze) ceramics have a higher superiority rate, and the ceramic surface quality made with the jade glaze is better and has a better jade-like transparent texture.

[0013] The chemical composition of the above-mentioned three treasures porcelain stone and glaze also contains some impurities, such as oxides of phosphorus and titanium.

[0014] In addition, the present invention also provides a method for preparing the jade glaze suitable for ultra-high temperature firing as described in any one of the above items, comprising the following steps:

[0015] According to weight, 1.3-1.7 parts of mullite refractory fiber and 6-9 parts of turquoise are added into a ball mill and dry-milled, and a mixture is obtained after sieving;

[0016] According to weight, 18-25 parts of Sanbao porcelain stone, 26-35 parts of quartz, 15-20 parts of kaolin and 17-22 parts of glaze fruit are added to the mixture, and then wet-milled in a ball mill to obtain the jade glaze suitable for ultra-high temperature firing.

[0017] In particular, in this scheme, the mullite refractory fiber and turquoise are first dry-milled in a ball mill, and then wet-milled after adding other raw materials. In this way, the obtained jade glaze has better quality and has a better porcelain effect when fired at an ultra-high temperature.

[0018] Preferably, the mixture is sieved through a 120-mesh sieve. The mixture needs to be sieved through a 120-mesh sieve, that is, the size (fineness) is ≤125 μm, and the fineness is more suitable to ensure that the mullite refractory fiber and turquoise in the mixture can play a better role in the jade glaze.

[0019] Preferably, the jade glaze suitable for ultra-high temperature firing is wet ball-milled to a fineness of 0.3-0.7% on a 250-mesh sieve. Similarly, the jade glaze after wet ball milling needs to pass through a 250-mesh (58 μm) sieve, and the sieve residue is 0.3-0.7%. When the fineness of the jade glaze is controlled within this range, it can be applied to the ceramic body more evenly and dispersedly, and has a better decorative effect.

[0020] In addition, the present invention also proposes a method for preparing ceramics, comprising the following steps: preparing a ceramic body, applying a jade glaze suitable for ultra-high temperature firing as described in any of the above items on the ceramic body, and firing in an oxidizing or reducing atmosphere to obtain the ceramics. The jade glaze prepared in this solution can be applied to the ceramic body by spraying or swinging glaze, and then ultra-high temperature firing can be used to obtain ceramics (daily art porcelain). Both the jade glaze and the ceramic preparation method provided by this method are simple and feasible, and are conducive to popularization and use.

[0021] Preferably, the firing temperature is 1380-1410°C and the firing time is 28-30h. Different from the traditional ceramic firing temperature (1200-1300°C), the firing temperature of this solution adopts ultra-high temperature firing, specifically 1380-1410°C, and the firing cycle is 28-30h. At the same time, the ceramics obtained by using the glaze still have good decorative effect and high-quality rate.

[0022] Preferably, the specific gravity of the jade glaze suitable for ultra-high temperature firing applied to the ceramic body is 1.55-1.60 g / ml.

[0023] The present invention also provides a ceramic, which is prepared by any of the above ceramic preparation methods. Since the ceramic adopts all the technical solutions of the above preparation methods, it at least has all the effects brought by the above technical solutions, which will not be described one by one here.

[0024] Compared with the prior art, the jade glaze and ceramic suitable for ultra-high temperature firing of the present invention have the following beneficial effects: providing a stable ultra-high temperature jade glaze, introducing mullite refractory fiber into the raw materials, improving the viscosity of the glaze at ultra-high firing temperature, making the glaze / ceramic maintain low rheology at ultra-high temperature (1380-1410°C), and presenting a stable appearance decorative effect, maintaining color stability in both oxidizing and reducing atmospheres, having a wide firing range, a high yield / excellent product rate, high hardness, and good stain resistance, having high aesthetic value and economic significance, and the jade glaze is particularly suitable for the preparation of daily-use art ceramics, and can effectively broaden the application of daily-use art ceramics, especially high-end daily-use tea sets, high-end furnishings and other exquisite utensils. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a physical picture of a ceramic made by using the jade glaze suitable for ultra-high temperature firing in this scheme;

[0027] Figure 2 This is a picture of the jade-like glaze suitable for ultra-high temperature firing applied when preparing ceramics in this scheme.

[0028] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] A method for preparing ceramics comprises the following steps:

[0032] S1. Preparing a ceramic body;

[0033] S2. A jade glaze suitable for ultra-high temperature firing is applied to the ceramic body by swinging glaze, pouring glaze or spraying glaze, wherein the specific gravity of the jade glaze is 1.55-1.60 g / ml;

[0034] S3. After sintering at 1380-1410° C. for 28-30 hours under an oxidizing or reducing atmosphere, the ceramic is obtained.

[0035] A method for preparing a jade glaze suitable for ultra-high temperature firing comprises the following steps:

[0036] S21. By weight, 1.3-1.7 parts of mullite refractory fiber and 6-9 parts of turquoise were added to a ball mill and dry milled to obtain a mixture after passing through a 120 mesh sieve;

[0037] S22. Add 18-25 parts of Sanbao porcelain stone, 26-35 parts of quartz, 15-20 parts of kaolin and 17-22 parts of glaze fruit to the mixture by weight, and then use wet ball milling in a ball mill to obtain a jade glaze (glaze slurry) suitable for ultra-high temperature firing after 0.3-0.7% of the residue is sieved through a 250-mesh screen.

[0038] The chemical composition of the Sanbao porcelain stone includes, by mass percentage, SiO2 71.33-74.71%, Al2O3 14.62-15.41%, CaO 0.56-0.71%, MgO 0.13-0.17%, K2O 3.89-4.13%, Na2O 3.46-3.83% and loss on ignition 1.05-1.19%;

[0039] The chemical composition of the glaze fruit includes, by mass percentage, SiO2 74.43-75.02%, Al2O3 14.63-14.87%, CaO 1.52-1.97%, MgO 0.16-0.21%, K2O 2.90-3.11%, Na2O 2.37-2.39% and loss on ignition 2.28-2.85%.

[0040] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention, and are not used to limit the present invention.

[0041] In this scheme, the green body raw material adopts Jingdezhen porcelain clay to be thrown and trimmed to obtain a ceramic green body. The following provides a group of ceramic green body raw materials for the preparation of the following embodiments: by weight, 73-85 parts of Fuliang kaolin mud and 15-27 parts of Fujian Longyan soil. The chemical composition of the above ceramic green body is: SiO2 43.94-47.69%, Al2O3 33.82-37.04%, CaO 0.33-0.42%, MgO0.07-0.23%, K2O 1.26-1.70%, Na2O0.45-0.95%, and loss on ignition 10.84-11.12%. In the following embodiments, the ceramic green body raw materials are: 79 parts of Fuliang kaolin mud and 21 parts of Fujian Longyan soil.

[0042] In other embodiments, the raw materials and dosage of the ceramic body can be adjusted adaptively.

[0043] Comparative Example 1

[0044] A method for preparing ceramics comprises the following steps:

[0045] S1. Preparing a ceramic body;

[0046] S2. Jade glaze was applied on the ceramic body by pouring glaze, the specific gravity of the jade glaze was 1.60g / ml; the jade glaze was prepared by wet ball milling after mixing the following raw materials: 14 parts of wollastonite, 31 parts of quartz, 21 parts of potassium feldspar, 16 parts of albite, and 18 parts of kaolin;

[0047] S3. After sintering at 1400° C. for 28 hours under a reducing atmosphere, the ceramic flows.

[0048] Example 1

[0049] A method for preparing ceramics comprises the following steps:

[0050] S1. Preparing a ceramic body;

[0051] S2. A jade glaze suitable for ultra-high temperature firing is applied to the ceramic body by spraying glaze, wherein the specific gravity of the jade glaze is 1.60 g / ml;

[0052] S3. After sintering at 1400° C. for 28 hours under a reducing atmosphere, the ceramic is obtained.

[0053] The method for preparing the jade glaze suitable for ultra-high temperature firing comprises the following steps:

[0054] S21. According to weight, 1.4 parts of mullite refractory fiber, 8 parts of turquoise, 24 parts of Sanbao porcelain stone, 28 parts of quartz, 17 parts of kaolin and 21.6 parts of glaze fruit are wet-milled in a ball mill (the material:water ratio is 100:40), and the residue after 250 mesh sieve is 0.3-0.7% to obtain a jade glaze suitable for ultra-high temperature firing.

[0055] In terms of mass percentage, the chemical composition of the Sanbao porcelain stone includes: SiO2 73.35%, Al2O3 14.83%, CaO 0.64%, MgO 0.15%, K2O 3.93%, Na2O 3.80% and loss on ignition 1.08% (the balance is impurities); the chemical composition of the glaze fruit includes: SiO2 75.02%, Al2O3 14.64%, CaO 1.73%, MgO 0.19%, K2O 3.04%, Na2O 2.37% and loss on ignition 2.75% (the balance is impurities).

[0056] Example 2

[0057] A method for preparing ceramics comprises the following steps:

[0058] S1. Preparing a ceramic body;

[0059] S2. A jade glaze suitable for ultra-high temperature firing is applied on the ceramic body by swinging glaze and spraying glaze, and the specific gravity of the jade glaze is 1.58g / ml;

[0060] S3. After sintering at 1410° C. for 28 hours under a reducing atmosphere, the ceramic is obtained.

[0061] The method for preparing the jade glaze suitable for ultra-high temperature firing comprises the following steps:

[0062] S21. According to weight, 1.5 parts of mullite refractory fiber, 6.5 parts of turquoise, 23 parts of Sanbao porcelain stone, 34 parts of quartz, 16 parts of kaolin and 19 parts of glaze fruit are wet-milled in a ball mill, and 0.3-0.7% of the residue is sieved through a 250-mesh sieve to obtain a jade glaze suitable for ultra-high temperature firing.

[0063] In terms of mass percentage, the chemical composition of the Sanbao porcelain stone includes: SiO2 71.87%, Al2O3 15.35%, CaO 0.70%, MgO 0.17%, K2O 4.06%, Na2O 3.58% and loss on ignition 1.13% (the balance is impurities); the chemical composition of the glaze fruit includes: SiO2 74.66%, Al2O3 14.78%, CaO 1.92%, MgO 0.16%, K2O 2.95%, Na2O 2.39% and loss on ignition 2.53% (the balance is impurities).

[0064] Comparative Example 2

[0065] The parameters and preparation steps of this comparative example are consistent with those of Example 1, except that no mullite refractory fiber is added.

[0066] Comparative Example 3

[0067] The parameters and preparation steps of this comparative example are consistent with those of Example 1, except that turquoise is not added.

[0068] Comparative Example 4

[0069] The parameters and preparation steps of this comparative example are consistent with those of Example 1, with the only difference being that the turquoise in the jade glaze raw material is replaced by talc.

[0070] Comparative Example 5

[0071] The parameters and preparation steps of this comparative example are consistent with those of Example 1, with the only difference being that the mullite refractory fiber in the jade glaze raw material is replaced by calcined alumina.

[0072] Comparative Example 6

[0073] The parameters and preparation steps of this comparative example are consistent with those of Example 1, with the only difference being that the turquoise in the jade glaze raw material is replaced by talc, and the mullite refractory fiber is replaced by calcined alumina.

[0074] Comparative Example 7

[0075] The parameters and preparation steps of this comparative example are consistent with those of Example 1, with the only difference being that the turquoise in the jade glaze raw material is replaced with talc (7.6 parts) and CuO (0.4 parts).

[0076] The ceramics (products) obtained in Comparative Examples 1-7 and Examples 1-2 were tested for performance, and the specific test results are shown in the following table:

[0077]

[0078] Note: 1. The above-mentioned wrinkles refer to Figure 1 All positions similar to A where there are bend transitions or grooves.

[0079] 2. Glaze accumulation degree: severe > large > small > none.

[0080] It can be seen from the test results of Comparative Example 1 that when ordinary glazes are fired at ultra-high temperatures, the obtained ceramic coloring effect is poor, and the conventional "gray glaze" is easy to flow at high temperatures. Since the product is placed vertically, the glaze on the top of the product will flow downward due to gravity, causing the glaze to accumulate under the product during firing. At the same time, the glaze layer on the top of the product is thin, and even some areas are "glazed", and cannot be evenly and completely attached to the surface of the blank, resulting in the inability to obtain a uniform coloring effect. There are also many defects such as pinholes on the glaze surface, and the rate of superior ceramic products is low.

[0081] It can be seen from the test results of Examples 1-2 that the jade glaze of this scheme can be well applied to ultra-high temperature firing conditions (1380-1410°C), and the obtained ceramic products have good color stability and uniform color distribution. Since turquoise is added to the raw materials of the jade glaze, and turquoise contains elements such as copper, after being added to the jade glaze, the obtained ceramic products can present a green jade transparent texture, while the coloring effect of free copper in the firing process is unstable, and the jade transparent texture in this scheme cannot be achieved by using a conventional glaze system. For example, in Comparative Example 1, its coloring effect and surface quality are both poor. In addition to having a good coloring effect, the ceramic products obtained by this scheme also have a high rate of superior products. The viscosity of the jade glaze is moderate at high temperature, and it is not easy to flow downward, so that the obtained ceramic (daily porcelain) products have a good decorative effect. Although there is a small amount of glaze accumulation in some folds, it does not affect the overall morphology of the product and is still a qualified ceramic product. Furthermore, when the jade glaze of Examples 1-2 is used on artistic porcelain with a less complex appearance, such glaze accumulation phenomenon will not occur because there are fewer bends or grooves.

[0082] It can be seen from the test results of Comparative Example 2 and Example 1 that when mullite refractory fiber is not added to the jade glaze, the stability of the glaze under ultra-high temperature system cannot be guaranteed, which will also cause the jade glaze to have a large fluidity at ultra-high temperature, similar to the traditional "gray glaze" firing effect. Therefore, the coloring effect and surface quality of the ceramic product are all reduced. It can be seen from the test results of Comparative Example 3 and Example 1 that when turquoise is not added to the jade glaze of this scheme, due to the lack of the introduction of "copper", the ceramic product will present a conventional white color and will not have an effect similar to natural jade, and the surface quality of the ceramic product will also be reduced, and the ceramic product will be "raw-fired" ("raw-fired" refers to the high water absorption rate of the ceramic product, the poor gloss and rough glaze surface, and the low strength).

[0083] It can be seen from the test results of Comparative Examples 4-6 and Example 1 that when turquoise is replaced by talc, the high-temperature fluidity of the glaze will be enhanced due to the stronger flux effect of talc, and talc does not contain copper. Therefore, the coloring effect and surface quality of the ceramic product are reduced; when the mullite refractory fiber is replaced by calcined alumina, the introduction of alumina will deteriorate the surface quality of the ceramic product; when turquoise is replaced by talc and CuO, despite the introduction of copper oxide, the final color of the ceramic product is still not as good as the overall appearance and surface quality when turquoise is used, and the obtained ceramic product does not have the warm jade texture.

[0084] Comparative Example 8

[0085] The parameters and preparation steps of this comparative example are consistent with those of Example 1, except that the amount of turquoise and / or mullite refractory fiber in the jade glaze raw material is different, as shown in the following table:

[0086] Adjusted jade glaze raw materials and dosage Comparative Example 8-1 3 parts turquoise Comparative Example 8-2 5 parts turquoise Comparative Example 8-3 10 parts turquoise Comparative Example 8-4 0.5 parts of mullite refractory fiber Comparative Example 8-5 1 part mullite refractory fiber Comparative Example 8-6 2 parts of mullite refractory fiber Comparative Example 8-7 5 parts turquoise, 0.8 parts mullite refractory fiber Comparative Example 8-8 10 parts turquoise, 2 parts mullite refractory fiber

[0087] Note: The other raw materials and amounts in the jade glaze remain unchanged unless otherwise specified.

[0088] Example 3

[0089] The parameters and preparation steps of this embodiment are consistent with those of embodiment 1, and the only difference is that the amount of turquoise and mullite refractory fiber in the jade glaze raw material is different (the amount of some raw materials also changes accordingly), as shown in the following table:

[0090] Adjusted jade glaze raw materials and dosage Example 3-1 6 parts turquoise Example 3-2 9 parts turquoise Example 3-3 1.3 parts of mullite refractory fiber Embodiment 3-4 1.7 parts of mullite refractory fiber Embodiment 3-5 7 parts turquoise, 1.5 parts mullite refractory fiber Embodiment 3-6 9 parts turquoise, 1.6 parts mullite refractory fiber

[0091] Note: The other raw materials and amounts in the jade glaze remain unchanged unless otherwise specified.

[0092] The ceramics (products) obtained in Comparative Example 8 and Example 3 were tested for performance, and the specific test results are shown in the following table:

[0093]

[0094] It can be seen from the above test results that when the amount of turquoise and mullite refractory fiber in this scheme is within the limited range, it has a good coloring effect. The jade glaze has a moderate viscosity at high temperature and will not flow down. It can be evenly attached to the surface of the body. The surface of the ceramic product is also free of defects, and the rate of superior products is high. When the amount of turquoise added is too little, due to the introduction of less "copper", it does not have the light emerald green effect similar to jade; when the amount of turquoise added is too much, it is easy to cause the color of the product to turn red. When the amount of mullite refractory fiber added is too little, at high temperature, the glaze is still easy to flow down, which will cause uneven distribution of glaze on the body, poor coloring effect, and obvious glaze accumulation; when the amount of mullite refractory fiber added is too much, it is easy to cause the glaze quality to deteriorate, and the yield rate of the obtained ceramic products is not high.

[0095] Example 4

[0096] The parameters and preparation steps of this embodiment are consistent with those of embodiment 1, and the only difference is that the preparation method of the jade glaze suitable for ultra-high temperature firing is different (combination of dry ball milling and wet ball milling is adopted):

[0097] S21. By weight, 1.4 parts of mullite refractory fiber and 8 parts of turquoise were added to a ball mill and dry milled to obtain a mixture after passing through a 120 mesh sieve;

[0098] S22. Add 24 parts of Sanbao porcelain stone, 28 parts of quartz, 17 parts of kaolin and 21.6 parts of glaze fruit to the mixture by weight, and then use wet ball milling in a ball mill. After the residue is 0.3-0.7% through a 250-mesh sieve, a jade glaze (glaze slurry) suitable for ultra-high temperature firing is obtained.

[0099] Example 5

[0100] A method for preparing ceramics comprises the following steps:

[0101] S1. Preparing a ceramic body;

[0102] S2. A jade glaze suitable for ultra-high temperature firing is applied on the ceramic body by swinging glaze and spraying glaze, and the specific gravity of the jade glaze is 1.55g / ml;

[0103] S3. After sintering at 1395° C. for 30 hours under a reducing atmosphere, the ceramic is obtained.

[0104] The method for preparing the jade glaze suitable for ultra-high temperature firing comprises the following steps:

[0105] S21. By weight, 1.7 parts of mullite refractory fiber and 8.5 parts of turquoise were added to a ball mill and dry milled to obtain a mixture after passing through a 120 mesh sieve;

[0106] S22. Add 22 parts of Sanbao porcelain stone, 27.8 parts of quartz, 20 parts of kaolin and 20 parts of glaze fruit to the mixture by weight, and then use wet ball milling in a ball mill. After the residue is 0.3-0.7% through a 250-mesh sieve, a jade glaze (glaze slurry) suitable for ultra-high temperature firing is obtained.

[0107] In terms of mass percentage, the chemical composition of the Sanbao porcelain stone includes: SiO2 74.62%, Al2O3 14.64%, CaO 0.59%, MgO 0.14%, K2O 4.10%, Na2O 3.63% and loss on ignition 1.06% (the balance is impurities); the chemical composition of the glaze fruit includes: SiO2 74.88%, Al2O3 14.85%, CaO 1.67%, MgO 0.20%, K2O 3.11%, Na2O 2.37% and loss on ignition 2.35% (the balance is impurities).

[0108] The ceramics (products) obtained in Examples 4-5 were subjected to performance tests, and the specific test results are shown in the following table:

[0109]

[0110] It can be seen from the above test results that, in addition to the special limitations of the raw materials, this scheme also adopts a combination of dry and wet ball milling to prepare jade glaze, wherein the mullite refractory fiber and turquoise are first dry-milled, and the obtained materials are then mixed with the remaining raw materials for wet ball milling. Practice has shown that the use of this type of process has better dispersion and can basically avoid glaze accumulation on complex ceramic products, making the jade glaze in this scheme more suitable for use on green bodies with complex morphologies, and there is no glaze accumulation at relatively special fold positions. The overall ceramic product is closer to the translucent and warm texture of natural jade, and the decorative effect is excellent.

[0111] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A jade glaze suitable for ultra-high temperature firing, characterized in that: The invention comprises the following raw materials which are mixed and then ball-milled by weight: 18-25 parts of Sanbao porcelain stone, 26-35 parts of quartz, 15-20 parts of kaolin, 6-9 parts of turquoise, 17-22 parts of glaze fruit and 1.3-1.7 parts of mullite refractory fiber.

2. The jade glaze suitable for ultra-high temperature firing according to claim 1, characterized in that: The chemical composition of the Sanbao porcelain stone includes, by mass percentage, SiO2 71.33-74.71%, Al2O3 14.62-15.41%, CaO0.56-0.71%, MgO 0.13-0.17%, K2O 3.89-4.13%, Na2O 3.46-3.83% and loss on ignition 1.05-1.19%; The chemical composition of the glaze fruit includes, by mass percentage, SiO2 74.43-75.02%, Al2O3 14.63-14.87%, CaO 1.52-1.97%, MgO0.16-0.21%, K2O 2.90-3.11%, Na2O 2.37-2.39% and loss on ignition 2.28-2.85%.

3. A method for preparing a jade glaze suitable for ultra-high temperature firing as claimed in any one of claims 1 to 2, characterized in that: The steps include: According to weight, 1.3-1.7 parts of mullite refractory fiber and 6-9 parts of turquoise are added into a ball mill and dry-milled, and a mixture is obtained after sieving; According to weight, 18-25 parts of Sanbao porcelain stone, 26-35 parts of quartz, 15-20 parts of kaolin and 17-22 parts of glaze fruit are added to the mixture, and then wet-milled in a ball mill to obtain the jade glaze suitable for ultra-high temperature firing.

4. The method for preparing the jade glaze suitable for ultra-high temperature firing according to claim 3, characterized in that: The mixed material is sieved through a 120-mesh sieve.

5. The method for preparing the jade glaze suitable for ultra-high temperature firing according to claim 3, characterized in that: The jade glaze suitable for ultra-high temperature firing is wet ball-milled to a fineness of 0.3-0.7% of the residue on a 250-mesh sieve.

6. A method for preparing ceramics, characterized in that: The steps include: A ceramic body is prepared, and the jade glaze suitable for ultra-high temperature firing as described in any one of claims 1 to 2 is applied on the ceramic body, and the ceramic is obtained after firing in an oxidizing or reducing atmosphere.

7. The method for preparing ceramics according to claim 6, characterized in that: The sintering temperature is 1380-1410° C., and the sintering time is 28-30 hours.

8. The method for preparing ceramics according to claim 6, characterized in that: The specific gravity of the jade glaze suitable for ultra-high temperature firing applied to the ceramic body is 1.55-1.60 g / ml.

9. A ceramic, characterized in that: The ceramic is prepared by the method for preparing the ceramic according to any one of claims 6 to 8.

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