Jade green tone ceramic glaze, glazed ceramic and preparation method thereof

Abstract

The invention relates to a jade green tone ceramic glaze, glazed ceramic and a preparation method thereof. The glaze comprises 50-60 parts of potassium feldspar, 20-30 parts of quartz, 10-20 parts of calcite, 3-5 parts of kaolin, 2-8 parts of zinc oxide, 3-8 parts of frit and 1.5-3.5 parts of copper oxide. The method is simple in process, low in cost, high in quality, safe in kiln operation and good in product glazing technology, the glaze body of the glazed ceramic is good in combination degree and equivalent in expansion coefficient, and the surface of the obtained ceramic has a green glaze surface with high brightness and jade luster.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic glaze, in particular to a jade green tone ceramic glaze, a glazed ceramic and a preparation method thereof. BACKGROUND

[0002] The development of ceramic glaze color and process innovation has always been one of the core research directions in the field of ceramic manufacturing. As a typical representative of traditional Chinese celadon art, jade green tone glaze is inspired by the warm and restrained color of natural jade, combining aesthetic value and cultural connotation. However, there are many technical bottlenecks in the preparation process and raw material selection of traditional jade green tone glaze, which restricts its large-scale application and environmental protection development.

[0003] Traditional technology can realize the change of glaze color from light green to green by controlling the ratio of ferrous oxide (FeO) and ferric oxide (Fe2O3) and the firing atmosphere (reducing flame or oxidizing flame). For example, the classic "powder green" and "plum green" tones were created by the South Song Dynasty Longquan kiln through multiple glazing and thick glaze layer technology, but the process is complex, which needs to go through multiple bisque firing and glazing, resulting in high energy consumption and low yield.

[0004] Traditional glaze relies on natural mineral raw materials (such as porcelain stone and purple gold soil), which has large composition fluctuation, leading to insufficient glaze color stability, and is difficult to meet the needs of modern industrial production. In addition, high-priced or environmentally high-load ingredients are often used, such as imported "Huiqing" as a colorant for Ming Dynasty celadon, which is costly and scarce. Although the use of nitrates in modern enamel glaze can enhance the performance of the glaze, the nitrogen oxides produced by high-temperature decomposition seriously pollute the environment. Although the ecological glaze technology (such as adding far-infrared minerals) has developed in recent years, its color range is limited, and the purity and saturation of jade green tone are still difficult to compare with traditional technology.

[0005] Current glaze research and development mainly focus on single performance optimization, lacking systematic solutions for the coordinated improvement of jade green tone aesthetics and functionality. For example, using synthetic pigments (such as chromium oxide) can stabilize the color, but the glaze lacks the natural jade's warm and restrained feeling; low-temperature fast firing process can reduce energy consumption, but it is easy to cause glaze cracking or insufficient gloss.

[0006] In summary, the existing jade green tone ceramic glaze technology has the defects of complex process, high cost of raw materials, insufficient environmental protection, and poor glaze color stability. It is urgent to develop a new glaze formula and preparation process to retain the traditional jade aesthetic while reducing harmful substances through raw material substitution (such as environmentally friendly minerals or synthetic materials), process simplification (such as single glazing and optimized firing curve), and industrialized production. Technical breakthroughs in this direction will promote the sustainable development of the ceramic industry and meet the dual needs of modern markets for high-end artistic porcelain and healthy daily-use porcelain. SUMMARY

[0007] The present application aims to provide a preparation method of jade green tone ceramic glaze, which is simple in process, safe in operation, and high in quality, bright and elegant in luster, and good in gloss.

[0008] The present application adopts the following scheme to solve the above technical problems: A preparation method of jade green tone ceramic glaze comprises the following steps: (1) Glaze processing Glaze raw materials are weighed according to the following mass percentage, wet ground and crushed, stirred and homogenized for more than 10 days to obtain glaze slurry: Potassium feldspar 50-60 parts Quartz 20-30 parts Calcite 10-20 parts Kaolin 3-5 parts Zinc oxide 2-8 parts Frit 3-8 parts Copper oxide 1.5-3.5 parts (2) Glazing The glaze slurry obtained in step (1) is passed through an 80-100 mesh sieve, and the glaze slurry is applied to the biscuit body, with a glaze layer thickness of 1.5-2 mm, and the obtained glaze biscuit is dried to a water content of less than 1%; (3) Firing The glaze biscuit obtained in step (2) is placed in a kiln, and fired in an oxidizing atmosphere at a temperature of 1230-1250℃ to obtain the jade green tone ceramic glaze.

[0009] Further, in the wet grinding process of step (1), the medium in the ball mill is material, ball and water, and the weight ratio is 1:(1.5-2):(0.1-1).

[0010] Further, the frit is a commercially available medium-temperature transparent frit.

[0011] Further, the fineness of the glaze slurry obtained in step (1) is 0.3%-0.5% on a 10,000 mesh sieve.

[0012] Further, the specific gravity of the glaze slurry used in step (2) is 1.55-1.65 g / cm 3 .

[0013] Further, step (2) uses immersion, showering or spraying to apply the glaze.

[0014] Further, the firing time of step (3) is 10-12h, and the highest temperature point is kept for 30-60min.

[0015] Further, the temperature rising control condition in the firing process of step (3) is as follows: Room temperature-300℃, 1~3h; 300-800℃, 1~2 h; 800-1000℃, 0.5~1.5 h; 1000-1250℃, 2~4 h; 1250℃, holding for 0.5~1 h; Natural cooling to room temperature.

[0016] The application further provides a jade green tone ceramic glaze prepared by the method.

[0017] The application further provides a ceramic with jade green glaze, wherein the jade green tone glaze on the surface of the ceramic is prepared by the method.

[0018] The application further provides a preparation method of a ceramic with jade green glaze, wherein the jade green tone glaze on the surface of the ceramic is prepared by the method.

[0019] Further, the raw material of the biscuit body comprises 25~30 parts of kaolin, 20~25 parts of feldspar, 20~30 parts of quartz and 10~15 parts of clay.

[0020] Further, the preparation method of the biscuit body comprises the following steps: a. grinding and homogenizing the raw material of the biscuit body to obtain a body slurry with a 3~5% residue on a 100-mesh sieve and a specific gravity of 1.5~1.6 g / cm 3 ; b. dehydrating the obtained body slurry to a water content of 25%~30%, homogenizing and aging for 1~2 months, and repeatedly refining the body mud; c. drying and dehydrating the obtained body mud after shaping, and finishing the surface; c. finishing the biscuit body at 750℃~800℃ for 6~8 h to obtain the biscuit body.

[0021] The application adds divalent copper, which is a color-producing agent for green, in the glaze. The divalent copper has low activity and can stably produce color. The use of zinc oxide and frit can increase the gloss of the glaze surface. The application has simple process, low cost, high quality, safe kiln operation and good product glaze surface technology. The glaze body of the glazed ceramic has good bonding degree and similar expansion coefficient, and the obtained ceramic surface has a high-brightness jade-gloss green glaze. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a first view of a physical picture of the jade green glazed ceramic obtained in Example 1 of the application. Figure 2 It is a second view of a physical picture of the jade green glazed ceramic obtained in Example 1 of the application. Figure 3 First view of the physical picture of the jade green glaze ceramic obtained in Example 2 of the present application; Figure 4 Second view of the physical picture of the jade green glaze ceramic obtained in Example 2 of the present application; Figure 5 Physical picture of the jade green glaze ceramic obtained in Example 3 of the present application; Figure 6 Physical picture of the jade green glaze ceramic obtained in Example 4 of the present application; Figure 7 Physical picture of the jade green glaze ceramic obtained in Example 5 of the present application. DETAILED DESCRIPTION

[0023] In order to better understand the present application, the following examples are further illustrations of the present application, but the content of the present application is not limited to the following examples.

[0024] Example 1 Preparation of the blank (1) Formula 30 parts of kaolin, 25 parts of feldspar, 30 parts of quartz, and 15 parts of clay.

[0025] (2) Processing technology ①, raw material processing a. According to the above formula, accurately weigh and crush in a wet ball mill; b. The grinding medium is material, ball and water, and the weight ratio is 1:1.5:0.7; c. Ball milling time is 20 hours, and the blank slurry fineness is 4% of the 10,000 mesh sieve residue and the specific gravity is 1.5 g / cm³; d. The well-milled blank slurry is continuously stirred in the slurry storage tank to prevent sedimentation. It is pumped to the filter press by a slurry pump, and is pressed and dewatered to a mud cake with a water content of 25%, and is dragged to the mud pool for aging for 2 months to make the water content uniform and the sodium humate alcoholization, and increase the plasticity of the blank; e. The already aged mud cake is repeatedly kneaded 2-3 times in a vacuum pug mill (vacuum degree 95%) to make the mud material expel air, the water content uniform, the structure dense, and the plasticity improved. At this time, the water content of the blank mud is 20%.

[0026] ②, forming a. Hand-pulling blank forming is adopted; b. Drying at 70°C or natural drying fixes the physical shape of the formed blank, but since it contains a certain amount of water, the blank body still has certain plasticity and is easy to deform and collapse, so it must be dried and dewatered to be shaped; c. After the dried and shaped blank, the surface is rough and uneven, and the size is not accurate, so it must be finely trimmed with a knife and sandpaper, and the surface of the blank body is made smooth and the size is made accurate with a brush dipped in water; d. Finishing the body at a temperature of 90°C or natural drying to a moisture content of 1% or less.

[0027] 3. Bisque firing The finished and dried body is subjected to bisque firing in a kiln at a temperature of 780°C for 7 hours to give the body mechanical strength, reduce breakage and increase the yield.

[0028] Glaze preparation (1) Formulation Potassium feldspar 50 parts, quartz 20 parts, calcite 20 parts, kaolin 5 parts, zinc oxide 8 parts, frit (origin: Zibo, Shandong, medium temperature transparent frit) 5 parts, copper oxide 3.5 parts.

[0029] (2) Processing technology 1. Glaze raw material processing a. Accurately weigh the materials according to the above formulation and process them in a wet ball mill; b. The medium in the ball mill is material, balls and water, and the weight ratio is 1:1.5:0.6; c. The grinding time of the glaze slurry is 48 hours, and the fineness of the glaze slurry is 0.4% on a 100-mesh sieve, and the specific gravity is 1.6 g / cm³; d. The glaze slurry is continuously stirred and homogenized in the glaze storage tank or pool for one month.

[0030] 2. Glazing a. The glaze slurry in the pool or tank is pumped into the glazing work bucket, and the glaze slurry is sieved through an 80-mesh sieve, and the specific gravity of the glaze slurry is 1.6%, and the flow rate is 40 seconds; b. The glaze slurry is applied to the bisque-fired body by dipping, spraying or spraying, and the glaze layer thickness is 1.5 mm; c. The glazed body is dried at a temperature of 90°C or naturally dried to a moisture content of 1% or less.

[0031] 3. Firing The qualified glazed body is placed on a shelf and fired in an oxidizing atmosphere according to the following firing process:

[0032] The appearance of the finished product is shown in Figure 1 , 2 .

[0033] Example 2 The difference from Example 1 is that: In the glaze preparation process: The glaze formulation is: potassium feldspar 52 parts, quartz 30 parts, calcite 20 parts, kaolin 5 parts, zinc oxide 8 parts, frit 8 parts, copper 3.5 parts.

[0034] The appearance of the finished product is shown in Figure 3 ,4 As shown.

[0035] Example 3 The difference from Example 1 is as follows: During the glaze preparation process: The glaze formula is as follows: 54 parts potassium feldspar, 28 parts quartz, 18 parts calcite, 3 parts kaolin, 6 parts zinc oxide, 6 parts frit, and 2.5 parts copper.

[0036] The appearance of the finished product is as follows Figure 5 As shown.

[0037] Example 4 The difference from Example 1 is as follows: During the glaze preparation process: The glaze formula is as follows: 55 parts potassium feldspar, 27 parts quartz, 17 parts calcite, 4 parts kaolin, 5 parts zinc oxide, 5 parts frit, and 2.5 parts copper.

[0038] The appearance of the finished product is as follows Figure 6 As shown.

[0039] Example 5 The difference from Example 1 is as follows: During the glaze preparation process: The glaze formula is as follows: 56 parts potassium feldspar, 26 parts quartz, 16 parts calcite, 3 parts kaolin, 4 parts zinc oxide, 4 parts frit, and 3 parts copper.

[0040] The appearance of the finished product is as follows Figure 7 As shown.

[0041] The above description is merely a preferred embodiment of the present invention, and should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing a jade green tone ceramic glaze, characterized by, It comprises the following steps: (1), glaze processing Glaze raw materials are weighed according to the following mass fraction, wet grinding and crushing, stirring and homogenizing for more than 10 days to obtain glaze slurry: Potassium feldspar 50~60 parts Quartz 20~30 parts Calcite 10~20 parts Kaolin 3~5 parts Zinc oxide 2~8 parts Frit 3~8 parts Copper oxide 1.5~3.5 parts; (2), glazing The glaze slurry obtained in step (1) is passed through an 80~100 mesh screen, and the glaze slurry is applied to the biscuit body, the glaze layer thickness is 1.5~2mm, and the obtained glaze biscuit is dried to a water content of less than 1%; (3), firing The glaze biscuit obtained in step (2) is placed in a kiln, and fired in an oxidizing atmosphere at a temperature of 1230~1250℃ to obtain the jade green tone ceramic glaze.

2. The production method according to claim 1, characterized by, The fineness of the glaze slurry obtained in step (1) is 0.3%~0.5% on a 1000 mesh screen.

3. The production method according to claim 1, characterized by, The specific gravity of the slip used in step (2) is 1.55 to 1.65 g / cm 3 .

4. The preparation method according to claim 1, characterized in that, The firing time of step (3) is 8~12h, and the highest temperature point is kept for 30~60min.

5. The preparation method according to claim 1, characterized in that, The temperature rising control conditions in the firing process of step (3) are as follows: Room temperature-300℃, 1~3h; 300-800℃，1~2 h； 800-1000℃，0.5~1.5 h； 1000-1250℃，2~4 h； 1250℃, keep for 0.5~1h; Natural cooling to room temperature.

6. A jade green shade ceramic glaze, characterized by, Prepared by the method of any one of claims 1~5.

7. A ceramic with jade green glaze, characterized by, The ceramic surface glaze is prepared by the method of any one of claims 1~5.

8. A method for producing a ceramic with jade green glaze, characterized by, The jade green tone glaze on the ceramic surface is prepared by the method of any one of claims 1~5.

9. The preparation method according to claim 7, characterized in that, The raw materials of the ceramic biscuit body include kaolin 25~30 parts, feldspar 20~25 parts, quartz 20~30 parts, and clay 10~15 parts.

10. The preparation method according to claim 7, characterized in that, The preparation method of the biscuit body comprises the following steps: a, grinding and homogenizing the raw material of the raw body to obtain a body slip with 3~5% of the residue of the million-hole sieve and 1.5~1.6g / cm of the specific gravity 3 ; b, the obtained biscuit slurry is dehydrated to a water content of 25%~30%, and is homogenized and aged for 1~2 months, and the mud is repeatedly refined to obtain biscuit mud; c, the obtained biscuit mud is dried and dehydrated after shaping, and the surface is finished; c, the finished biscuit body is biscuited at 750℃~800℃, and the time is 6~8h to obtain the biscuit body.

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