Shino glaze and method for producing the same

Abstract

The present application relates to a kind of shino glaze and preparation method thereof, belong to inorganic material technical field.The preparation method of shino glaze described in the present application includes: A.high clay, potassium feldspar, calcite, quartz sand, talc powder, zinc oxide are mixed to obtain glaze pulp, and the mass ratio of high clay, potassium feldspar, calcite, quartz sand, talc powder, zinc oxide is 12~19:31~39:8~12:22~29:10:5;B.the glaze pulp is stale;C.the glaze pulp after stale is mixed evenly, and then the glaze is applied on the surface of ceramic body using the mixed glaze pulp, so that the glaze layer thickness is between 3~4mm;D.the ceramic body after glazing is dried.The shino glaze disclosed in the present application and preparation method thereof have the characteristics of convenient material selection, low cost, non-toxic raw ore, green and healthy, low firing temperature, short cycle, energy saving and environmental protection, etc.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of shino glaze and its preparation method, belong to inorganic material technical field. BACKGROUND

[0002] Shino glaze is with its rugged simple and unadorned modeling, light snow glaze, warm jade quality, thick weight, soft hand, so that shino glaze has higher comfort in touch and vision, is loved by people. Shino glaze is from Japan, is tea pottery style that is fired by Mino kiln in Japan Momoyama era, has four or five hundred years of history, its predecessor is white day eyes, originates from China, belongs to feldspar glaze, compared with lime glaze, it has high temperature liquid phase surface tension, mature temperature range is wider, lower transparency and has certain opalescent effect etc.

[0003] The existing shino glaze is more for the design of shino glaze body modeling etc. appearance, and the research on the formula and process of shino glaze is insufficient;In addition, the formula and process of shino glaze have the following defects: a. continue the firing method of traditional feldspar glaze, the firing temperature is higher, usually higher than 1200 DEG C, the firing period is long, usually more than ten hours;b. shino glaze is 3-4mm thick, and the thick glaze layer is easy to produce shrinkage, cracking, glaze flow etc. These problems limit the development and application of shino glaze related technology and product;c. In addition, the existing glaze needs fine particle raw materials, needs long time grinding, high energy consumption, low generation efficiency;d. The raw material source of shino glaze is narrow. SUMMARY

[0004] The first object of the present application is to provide a new preparation method of shino glaze.

[0005] To achieve the first object of the present application, the preparation method of shino glaze comprises:

[0006] A. the kaolin, potassium feldspar, calcite, quartz sand, talc powder, zinc oxide, water are mixed to obtain glaze pulp, and the mass ratio of kaolin, potassium feldspar, calcite, quartz sand, talc powder, zinc oxide is 12-19:31-39:8-12:22-29:10:5;

[0007] B. the glaze pulp is aged;

[0008] C. the aged glaze pulp is mixed uniformly, and then the uniformly mixed glaze pulp is used to glaze the surface of ceramic body, so that the glaze layer thickness is between 3-4mm;

[0009] D. the ceramic body after glazing is dried;

[0010] E. The dried ceramic body of step D is fired; the firing is started from room temperature, and the temperature is raised to 500-600℃ at a rate of 5.5-6℃ / min, then raised to 600-900℃ at a rate of 3-4℃ / min, and then raised to 1180-1200℃ at a rate of 6-6.5℃ / min, and kept for 30-40min, and finally the heating is stopped, and the furnace is cooled to room temperature to obtain a Shi no glaze product.

[0011] The first stage of the heating rate cannot be too fast, otherwise defects are likely to occur, and the heating rate should not exceed 6℃ / min, and the second stage of the heating rate is 3-4℃ / min, and a too fast heating rate will also cause cracking and other problems. The above firing process can ensure that the organic matter is fully decomposed.

[0012] The firing time of step E is about 5h.

[0013] In one embodiment, the total mass of the kaolin, potassium feldspar, calcite, quartz sand, talc powder, and zinc oxide is M, and the mass ratio of M to water is 1:0.5-0.8; and the kaolin is preferably kaolin from the Panxi region.

[0014] In one embodiment, step A further comprises ball milling the glaze slurry, and the ball milling controls the ratio of the glaze slurry to the balls to be 1:1.5-2.

[0015] In one embodiment, the ball milling time is 6-8min.

[0016] In one embodiment, the particle size of the raw materials in the glaze slurry of step B is less than 100 mesh, preferably 100-240 mesh, and more preferably 100-190 mesh.

[0017] In one embodiment, the aging time of step B is more than 24h.

[0018] The aging of step B is preferably carried out in a sealed, dry, and cool environment.

[0019] In one embodiment, the ceramic body of step C is a bisque-fired ceramic body.

[0020] In one embodiment, the method of applying glaze of step C is at least one of dipping, brushing, and spraying; and since it is a thick glaze, dipping is the easiest way to control the thickness, and therefore dipping is preferred; and the dipping is preferably dipping the ceramic body into the glaze for 8-10s, and dipping multiple times until the thickness of the glaze layer meets the requirements.

[0021] In a specific embodiment, the ceramic body of step C is further pre-processed before glazing, the pre-processing including cleaning the surface of the ceramic body of dust and appropriately supplementing water, and the ceramic body can be glazed after the surface of the ceramic body is dried by wind; the appropriate supplementing of water is such that no pores and cracks are generated during glazing and the glaze can be hung; the drying of step D is preferably at a temperature lower than 60 DEG C, and the drying is preferably natural drying.

[0022] Too little supplementing of water can result in defects, and too much supplementing of water can result in failure to hang the glaze, and too much water can be appropriately dried before glazing.

[0023] The drying can be performed by using a drying oven or by natural drying, and the temperature should not be too high, and is preferably lower than 60 DEG C, and the natural drying is the most cost-saving, and the ceramic body is not easily deformed, and thus the natural drying is preferred.

[0024] A second object of the present application is to provide a new Shino glaze.

[0025] To achieve the second object of the present application, the Shino glaze is prepared by the above method, has a whiteness of 67-74, a glossiness of 23-31, a smooth and flat glaze surface, and good thermal shock resistance, and is not cracked after three times of thermal exchange at 200-20 DEG C.

[0026] Beneficial effects:

[0027] The Shino glaze and the preparation method thereof disclosed by the present application have the characteristics of convenient material selection, low cost, non-toxic raw ore, green and healthy, low firing temperature, short firing period, energy saving and environmental protection, and the like, and the specific performance is as follows:

[0028] 1. The Shino glaze preparation method disclosed by the present application has the characteristics of low firing temperature and short firing period, and the highest firing temperature is 1180-1200 DEG C, and the firing period is about 5 h, and the energy consumption is low and the production efficiency is high.

[0029] 2. The Shino glaze preparation method disclosed by the present application has the characteristics of low mesh number of glaze screening and coarse glaze particles (the diameter is about 0.150 mm), and thus the ball milling time is short, and only needs to be rapidly ball milled for 6-8 min, and the residue after screening through a 100 mesh standard sieve is less than 0.5%, and the energy consumption is reduced and the production efficiency is increased.

[0030] 3. The Shino glaze preparation method disclosed by the present application has a wide source of raw materials, and opens up a new application prospect for the comprehensive utilization of the rich ceramic resources in Panxi region.

[0031] 4. The Shino glaze disclosed by the present application is a raw ore glaze except for a small amount of zinc oxide, and belongs to the category of raw ore glaze. The raw ore material is used in the preparation of the Shino glaze, and no toxic raw material such as lead and cadmium is introduced, and the pollution to the environment is reduced, and the method is safe and reliable, and is more widely used.

[0032] 5. The Shino glaze produced by the present application has no special requirements for the body.

[0033] 6. The Shino glaze has a glaze layer of 3-4 mm, which is relatively thick and is prone to problems such as shrinkage, cracking, and glaze flow, which limit the development and application of related technologies and products of the Shino glaze. The Shino glaze of the present application solves the problem and has a light snow-like glaze color, soft texture, and warm quality, and has high ornamental and use values. It is suitable for tea bowls, cups, and other tea utensils, and can also be used for pots, plates, toys, inkstones, and other household utensils. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A process flow chart of the present application;

[0035] Figure 2 Photos of Shino glaze on light-colored porcelain body for Examples 1-5;

[0036] Figure 3 Photos of Shino glaze on light-colored porcelain body for Comparative Examples 1-5;

[0037] Figure 4 A photo of a Shino glaze cup prepared from glaze slip for Example 1;

[0038] Figure 5 A Shino sintering temperature curve of the present application. DETAILED DESCRIPTION

[0039] To achieve the first object of the present application, the preparation method of the Shino glaze comprises:

[0040] A. mixing kaolin, potassium feldspar, calcite, quartz sand, talc powder, zinc oxide, and water to obtain glaze slip, wherein the mass ratio of the kaolin, potassium feldspar, calcite, quartz sand, talc powder, and zinc oxide is 12-19:31-39:8-12:22-29:10:5;

[0041] B. aging the glaze slip;

[0042] C. mixing the aged glaze slip uniformly, and then applying the uniformly mixed glaze slip to the surface of the ceramic body to form a glaze layer with a thickness of 3-4 mm;

[0043] D. drying the ceramic body after glazing;

[0044] E. The dried ceramic body of step D is fired; the firing is started from room temperature, and the temperature is raised to 500-600℃ at a rate of 5.5-6℃ / min, then raised to 600-900℃ at a rate of 3-4℃ / min, and then raised to 1180-1200℃ at a rate of 6-6.5℃ / min, and kept for 30-40min, and finally the heating is stopped, and the furnace is cooled to room temperature to obtain a Shi no glaze product.

[0045] The first stage heating rate cannot be too fast, otherwise defects are easily produced, and the heating rate should not exceed 6℃ / min, and the second stage heating rate is 3-4℃ / min, and a too fast heating rate will also cause cracking and other problems. The above firing process can ensure that the organic matter is fully decomposed.

[0046] The firing time of step E is about 5h.

[0047] In one embodiment, the total mass of the kaolin, potassium feldspar, calcite, quartz sand, talc powder and zinc oxide is M, and the mass ratio of M to water is 1:0.5-0.8; the kaolin is preferably the kaolin in the Panxi region.

[0048] In one embodiment, step A further comprises ball milling the glaze slurry, and the ball milling controls the ratio of glaze slurry:ball to be 1:1.5-2.

[0049] In one embodiment, the ball milling time is 6-8min.

[0050] In one embodiment, the particle size of the raw materials in the glaze slurry of step B is below 100 mesh, preferably 100-240 mesh, and more preferably 100-190 mesh.

[0051] In one embodiment, the aging time of step B is more than 24h.

[0052] The aging of step B is preferably carried out in a sealed, dry and cool environment.

[0053] In one embodiment, the ceramic body of step C is a bisque-fired ceramic body.

[0054] In one embodiment, the glazing method of step C is at least one of dipping, brushing and spraying; since it is a thick glaze, dipping is the easiest way to control the thickness, and therefore dipping is preferred; the dipping is preferably dipping the ceramic body into the glaze for 8-10s, and dipping multiple times until the glaze layer thickness meets the requirements.

[0055] In a specific embodiment, the ceramic body of step C is further pre-processed before glazing, which includes cleaning the surface of the ceramic body of dust and appropriately supplementing water, and the surface of the ceramic body is allowed to dry before glazing, and the appropriate supplement of water is determined according to whether air holes, cracks or glaze are generated during glazing; the drying temperature of step D is preferably less than 60℃, and the drying is preferably natural drying.

[0056] Too little water supplementing is prone to defects, and too much water supplementing cannot be hung with glaze, and too much water can be appropriately dried before dipping, and the water supplementing is flexibly controlled.

[0057] The drying can be oven drying or natural drying, and the temperature is preferably less than 60℃, and the natural drying is the most cost-saving, and the ceramic body is not prone to deformation, and thus the natural drying is preferred.

[0058] In a specific embodiment, the materials are kaolin, potassium feldspar, calcite, quartz sand, talc powder and zinc oxide, the chemical composition of the mineral raw materials is shown in Table 1, the ZnO is analytical pure with a purity of 99%, the firing temperature is 1180-1200℃, and the holding time is 30-40 min. The Shino glaze formula disclosed by the present application (each component is in percentage by mass) is that the content of kaolin is 12-19%, the content of potassium feldspar is 31-39%, the content of calcite is 8-12%, the content of quartz sand is 22-29%, the content of talc powder is 10%, and the content of zinc oxide is 5%.

[0059] Table 1 Chemical composition of mineral raw materials (wt%)

[0060]

[0061] The specific process scheme is as follows:

[0062] 1. Weighing: use an electronic balance to weigh each raw material according to the formula table;

[0063] 2. Ball milling: put the weighed raw materials into a rapid ball mill, control the ratio of material, ball and water to be 1:2:0.5, and rapidly ball mill for 8 min;

[0064] 3. Sieving: sieve the milled glaze slurry through a 100-mesh standard sieve;

[0065] 4. Aging: put the sieved glaze slurry into a glaze cup, seal it with plastic wrap, and place it in a dry and cool place for aging for 24 h;

[0066] 5. Glazing: stir the aged glaze slurry evenly; wipe the surface of the porcelain ceramic body with a wet sponge to remove dust and appropriately supplement water, and then glaze the surface of the ceramic body after the water is dried; in this experiment, the glazing is performed by dipping, and the ceramic body is dipped into the glaze for 8-10 s each time, and the glazing can be performed multiple times to keep the thickness of the glaze layer between 3-4 mm;

[0067] 6. Drying: the glazed ceramic body is naturally air-dried.

[0068] 7. Firing: the air-dried ceramic body is placed in an electric kiln for firing; the temperature is raised from room temperature to 600℃ at a rate of 5.5℃ / min, then to 900℃ at a rate of 3℃ / min, and then to 1180-1200℃ at a rate of 6℃ / min, and maintained for 30-40 min; finally, the heating is stopped and the kiln is allowed to cool to room temperature to obtain the Shi-no glazed product, and the firing time is about 5 h.

[0069] To achieve the second object of the present application, the Shi-no glaze is prepared by the above method, has a whiteness of 67-74, a glossiness of 23-31, a smooth and even glaze surface, and good thermal shock resistance, and does not crack after 200-20℃ thermal exchange for three times.

[0070] The specific embodiments of the present application are further described below in conjunction with examples, and the present application is not limited in the scope of the described examples.

[0071] Example 1

[0072] The materials are weighed according to the mass percentage: kaolin content is 12%, potassium feldspar content is 32%, calcite content is 12%, quartz sand content is 29%, and talc content is 10%, and zinc oxide content is 5%.

[0073] Water is added to the raw materials of step 1, and placed in a rapid ball mill, with the material:ball:water ratio controlled at 1:2:0.5, and rapid ball milling is performed for 8 min;

[0074] The glaze slurry in step 2 is passed through a 100-mesh standard sieve, and the residue is less than 0.5%;

[0075] The glaze slurry of step 3 is placed in a glaze cup, sealed with plastic wrap, and placed in a dry and cool place for 24 h for aging;

[0076] The aged glaze slurry of step 4 is removed from the upper clear liquid, and then stirred uniformly;

[0077] The glaze is applied by immersion, the dust on the surface of the ceramic body is wiped off with a wet sponge, and the ceramic body is appropriately watered, and then the glaze is applied after the water on the surface of the ceramic body is air-dried, the ceramic body is immersed in the glaze for 8-10 s each time, and the glaze is applied multiple times, so that the thickness of the glaze layer is maintained at 3-4 mm.

[0078] The glazed ceramic body is naturally air-dried;

[0079] The sample obtained in step 7 is put into an electric kiln for firing, starting from room temperature and increasing to 600 DEG C at a rate of 5.5 DEG C / min, then increasing to 900 DEG C at a rate of 3 DEG C / min, and then increasing to 1180 DEG C at a rate of 6 DEG C / min and keeping for 40 min, and finally stopping heating and cooling to room temperature with the furnace to obtain a Shino glaze product.

[0080] In order to facilitate observation, the light-colored ceramic blank in example 1 is fired into a light-colored ceramic disc, as shown in Figure 2 No. 1 sample of the present application, and in addition, a dark red ceramic blank cup is fired by the method of example 1 Figure 4 .

[0081] The whiteness of the ceramic Shino glaze product in the present application is determined by an SBDY-1 type digital whiteness meter, and the glossiness is determined by a WGG60 glossiness meter produced by Shanghai Jieying Electronic Technology Co., Ltd.

[0082] The Shino glaze prepared in the present example has a whiteness of 67.4, a glossiness of 24.5, and a thermal shock resistance of 200 DEG C to 20 DEG C for 3 times without cracking, and good opalescent effect and smooth and flat glaze surface.

[0083] Example 2

[0084] The materials are weighed according to mass percentage: kaolin content is 12%, potassium feldspar content is 32%, calcite content is 12%, quartz sand content is 29%, talc content is 10%, and zinc oxide content is 5%.

[0085] Water is added to the raw materials in step 1, and placed in a rapid ball mill, and the material: ball: water is controlled to be 1:2:0.5, and rapid ball milling is performed for 8 min;

[0086] The glaze slurry in step 2 is passed through a 100-mesh standard sieve, and the residue is less than 0.5%;

[0087] The glaze slurry in step 3 is placed in a glaze cup, sealed with plastic wrap, and placed in a dry and cool place for 24 h for aging;

[0088] The aged glaze slurry in step 4 is removed from the upper clear liquid, and then stirred uniformly;

[0089] The glaze is applied by immersion, the dust on the surface of the ceramic blank is wiped off with a wet sponge, and the water is appropriately supplemented, and the ceramic blank is immersed in the glaze for 8-10 s each time, and the glaze layer thickness is maintained between 3-4 mm;

[0090] The glazed ceramic blank is naturally air-dried;

[0091] The sample obtained in step 7 is put into an electric kiln for firing, starting from room temperature and increasing to 600℃ at a rate of 5.5℃ / min; then increasing to 900℃ at a rate of 3℃ / min; then increasing to 1200℃ at a rate of 6℃ / min and keeping for 40min; finally stopping heating and cooling to room temperature with the furnace to obtain Shino glaze products.

[0092] For the convenience of observation, the light-colored ceramic round pieces are fired by using the light-colored biscuit ceramic body of Example 2, as shown in No. 2 sample of Figure 2 .

[0093] The Shino glaze prepared in this example has a whiteness of 69.8, a glossiness of 24.9, a thermal shock resistance of 200℃-20℃ rapid cooling for 3 times without cracking, a good opalescent effect, and a smooth and flat glaze surface.

[0094] Example 3

[0095] The materials are weighed according to the mass percentage: kaolin content is 13%, potassium feldspar content is 38%, calcite content is 9%, quartz sand content is 24%, talc content is 11%, and zinc oxide content is 5%.

[0096] Water is added to the raw materials in step 1, and the mixture is placed in a rapid ball mill, with the material:ball:water ratio controlled at 1:2:0.5, and rapid ball milling for 8min;

[0097] The glaze slurry in step 2 is passed through a 100-mesh standard sieve, and the residue is less than 0.5%;

[0098] The glaze slurry in step 3 is placed in a glaze cup and sealed with plastic wrap, and then placed in a dry and cool place for 24h aging;

[0099] The aged glaze slurry in step 4 is removed from the upper layer of the clear liquid, and then stirred uniformly;

[0100] The glaze is applied by dipping, first wiping the surface of the biscuit ceramic body with a wet sponge to remove dust, and then appropriately adding water. After the water on the surface of the ceramic body is air-dried, the glaze can be applied. Each time the ceramic body is dipped into the glaze for 8-10s, and the glaze layer thickness can be maintained at 3-4mm by multiple dipping;

[0101] The glazed ceramic body is naturally air-dried;

[0102] The sample obtained in step 7 is put into an electric kiln for firing, starting from room temperature and increasing to 600℃ at a rate of 5.5℃ / min; then increasing to 900℃ at a rate of 3℃ / min; then increasing to 1180℃ at a rate of 6℃ / min and keeping for 30min; finally stopping heating and cooling to room temperature with the furnace to obtain Shino glaze products.

[0103] For the convenience of observation, the light-colored ceramic round pieces are fired by using the light-colored biscuit ceramic body of Example 3, as shown in No. 3 sample ofFigure 2 Sample No. 3.

[0104] The Shino glaze prepared in this embodiment has a whiteness of 73.4, a gloss of 23.9, and thermal shock resistance: it does not crack after being rapidly cooled three times from 200℃ to 20℃. It also has a good opacity effect and a smooth and flat glaze surface.

[0105] Example 4

[0106] The materials are weighed according to the following percentages by weight: kaolin content is 12%, potassium feldspar content is 38%, calcite content is 10%, quartz sand content is 25%, talc content is 10%, and zinc oxide content is 5%.

[0107] Add water to the raw material in step 1, place it in a high-speed ball mill, control the ratio of material:ball:water = 1:2:0.5, and ball mill for 8 minutes.

[0108] Pass the glaze slurry from step 2 through a 100-mesh standard sieve, and the residue should be less than 0.5%.

[0109] Pour the glaze slurry from step 3 into a glaze cup, seal it with plastic wrap, and place it in a dry, cool place to age for 24 hours.

[0110] Remove the clear liquid from the top layer of the aged glaze slurry in step 4, and then stir it evenly.

[0111] Glazing is done by dipping the ceramic body in the glaze. First, wipe the dust off the surface of the unglazed ceramic body with a damp sponge and add water as needed. After the surface of the ceramic body is dry, the glaze can be applied. Each time, immerse the ceramic body in the glaze for 8 to 10 seconds. Multiple glazings can be performed to keep the glaze layer thickness between 3 and 4 mm.

[0112] The glazed ceramic body is air-dried naturally;

[0113] The sample obtained in step 7 was placed in an electric kiln for firing. The temperature was increased from room temperature to 600°C at a rate of 5.5°C / min; then increased to 900°C at a rate of 3°C / min; then increased to 1180°C at a rate of 6°C / min and held for 30 minutes; finally, the heating was stopped and the sample was cooled to room temperature in the kiln to obtain the Shino glaze product.

[0114] For ease of observation, in Example 4, light-colored unglazed ceramic blanks were used to fire light-colored ceramic discs. See details below. Figure 2 Sample No. 4.

[0115] The Shino glaze prepared in this embodiment has a whiteness of 71.6, a gloss of 24.1, and thermal shock resistance: it does not crack after being rapidly cooled three times between 200℃ and 20℃. It also has a good opacity effect and a smooth and flat glaze surface.

[0116] Example 5

[0117] The raw materials are weighed according to the mass percentage: kaolin content is 19%, potassium feldspar content is 32%, calcite content is 8%, quartz sand content is 26%, talc content is 10%, and zinc oxide content is 5%

[0118] Water is added to the raw materials of step 1, and placed in a rapid ball mill, with the material:ball:water ratio controlled at 1:2:0.5, and rapid ball milling for 8 minutes;

[0119] The glaze slurry in step 2 is sieved through a 100-mesh standard sieve, and the residue is less than 0.5%;

[0120] The glaze slurry of step 3 is placed in a glaze cup, sealed with plastic wrap, and placed in a dry and cool place for 24 hours of aging;

[0121] The aged glaze slurry of step 4 is removed from the top layer, and then stirred uniformly;

[0122] The glaze is applied by dipping, first wiping the surface of the porcelain body with a wet sponge to remove dust, and then applying the glaze. The porcelain body is immersed in the glaze for 8-10 seconds each time, and the glaze layer thickness is maintained at 3-4 mm;

[0123] The glazed porcelain body is naturally air-dried;

[0124] The sample obtained in step 7 is placed in an electric kiln and fired, starting from room temperature at a heating rate of 5.5°C / min to 600°C, then at a heating rate of 3°C / min to 900°C, then at a heating rate of 6°C / min to 1180°C, and holding for 30 minutes, and finally stopping heating and cooling to room temperature to obtain a Shino glaze product.

[0125] For easy observation, a light-colored porcelain disc is fired using a light-colored bisque body according to Example 5, as shown in Figure 2 No. 5 sample.

[0126] The Shino glaze prepared in this example has a whiteness of 70.3, a glossiness of 30.2, a thermal shock resistance of 200°C-20°C, and a good opalescent effect, with a smooth and flat glaze surface.

[0127] Comparative Example 1

[0128] The raw materials are weighed according to the mass percentage: kaolin content is 12%, potassium feldspar content is 32%, calcite content is 12%, quartz sand content is 29%, talc content is 10%, and zinc oxide content is 5%.

[0129] Water is added to the raw materials of step 1, and placed in a rapid ball mill, with the material:ball:water ratio controlled at 1:2:0.5, and rapid ball milling for 8 minutes;

[0130] The slip in Step 2 is sieved through a 100-mesh standard sieve, with the residue being less than 0.5%;

[0131] The slip in Step 3 is placed in a glaze cup, sealed with plastic wrap, and left to stand in a dry and cool place for 24 hours to age;

[0132] The aged slip in Step 4 is removed from the upper clear liquid, and then stirred evenly;

[0133] The glazing is performed by dipping. The dust on the surface of the ceramic body is wiped off with a wet sponge, and the ceramic body is appropriately watered. After the water on the surface of the ceramic body is dried, the glazing is performed. The ceramic body is dipped into the glaze for 8-10 seconds each time, and the glazing can be performed multiple times, so that the thickness of the glaze layer is maintained at 3-4 mm;

[0134] The glazed ceramic body is naturally air-dried;

[0135] The sample obtained in Step 7 is placed in an electric kiln. The temperature is raised to 600°C at a rate of 5.5°C / min from room temperature, then raised to 900°C at a rate of 3°C / min, and then raised to 1160°C at a rate of 6°C / min (the difference between Comparative Example 1 and Example 1 is only the temperature), and the temperature is maintained for 40 minutes. Finally, the heating is stopped, and the furnace is cooled to room temperature to obtain a Shino glaze product.

[0136] In order to facilitate observation, the light-colored ceramic disc is burned by using a light-colored bisque ceramic body in Comparative Example 1. Details are shown in Figure 3 No. 1 sample.

[0137] The Shino glaze prepared in this comparative example has a whiteness of 65.7, a glossiness of 9.1, a thermal shock resistance of 200°C-20°C rapid cooling for 3 times without cracking, an uneven glaze surface, and no warm and moist luster.

[0138] Comparative Example 2

[0139] The materials are weighed according to the mass percentage: the content of kaolin is 12%, the content of potassium feldspar is 32%, the content of calcite is 12%, the content of quartz sand is 29%, the content of talc is 10%, and the content of zinc oxide is 5%.

[0140] Water is added to the raw materials in Step 1, and placed in a rapid ball mill. The material:ball:water is controlled to be 1:2:0.5, and the rapid ball milling is performed for 8 minutes;

[0141] The slip in Step 2 is sieved through a 100-mesh standard sieve, with the residue being less than 0.5%;

[0142] The slip in Step 3 is placed in a glaze cup, sealed with plastic wrap, and left to stand in a dry and cool place for 24 hours to age;

[0143] The aged slip in Step 4 is removed from the upper clear liquid, and then stirred evenly;

[0144] The glaze is applied by dipping, and the dust on the surface of the ceramic body is wiped with a wet sponge, and the ceramic body is appropriately watered. After the water on the surface of the ceramic body is dried, the ceramic body is dipped into the glaze for 8-10 s, and the dipping is repeated to keep the thickness of the glaze layer at 3-4 mm.

[0145] The ceramic body with the glaze is naturally dried

[0146] The sample obtained in step 7 is placed in an electric kiln, and the temperature is raised to 600℃ at a rate of 5.5℃ / min from room temperature, then raised to 900℃ at a rate of 3℃ / min, then raised to 1240℃ at a rate of 6℃ / min, and kept for 40 min. Finally, the heating is stopped, and the sample is cooled to room temperature in the kiln to obtain a Shino glaze product.

[0147] For the convenience of observation, the light-colored ceramic disc is fired by using the light-colored biscuit ceramic body of Comparative Example 2, which is detailed in Figure 3 No. 2 sample.

[0148] The Shino glaze prepared in the present comparative example has a whiteness of 45.5, a glossiness of 43.4, a thermal shock resistance of 200℃-20℃ rapid cooling for 3 times without cracking, a poor opalescence, and a large number of bubbles visible to the naked eye in the glaze layer.

[0149] Comparative Example 3

[0150] The materials are weighed according to the mass percentage: the content of kaolin is 30%, the content of potassium feldspar is 40%, the content of calcite is 10%, and the content of quartz sand is 20%.

[0151] Water is added to the raw materials in step 1, and the mixture is placed in a rapid ball mill, and the ratio of material, ball and water is controlled to be 1:2:0.5. The mixture is rapidly ball milled for 15 min.

[0152] The glaze slurry in step 2 is sieved through a 250-mesh standard sieve, and the residue is less than 0.5%.

[0153] The glaze slurry in step 3 is placed in a glaze cup, sealed with plastic wrap, and placed in a dry and cool place for 24 h for aging.

[0154] The supernatant of the aged glaze slurry in step 4 is removed, and the mixture is stirred uniformly.

[0155] The glaze is applied by dipping, and the dust on the surface of the ceramic body is wiped with a wet sponge, and the ceramic body is appropriately watered. After the water on the surface of the ceramic body is dried, the ceramic body is dipped into the glaze for 8-10 s, and the dipping is repeated to keep the thickness of the glaze layer at 3-4 mm.

[0156] The ceramic body with the glaze is naturally dried

[0157] The sample obtained in step 7 is placed in an electric kiln for firing, starting from room temperature at a temperature rising rate of 5.5 ℃ / min to 600 ℃; then at a temperature rising rate of 3 ℃ / min to 900 ℃; then at a temperature rising rate of 6 ℃ / min to 1200 ℃, and keeping for 30 min; finally, stop heating, and cool down to room temperature with the furnace to obtain a Shino glaze product.

[0158] For easy observation, the light-colored ceramic round pieces are fired by using the light-colored biscuit ceramic body of Comparative Example 3, as shown in Table 3. Figure 3

[0159] The Shino glaze prepared in the present comparative example has large cracks on the glaze surface, and the glaze color is yellow, without the characteristic of the Shino glaze color being snow white.

[0160] Comparative Example 4

[0161] The materials are weighed according to the mass percentage: the content of kaolin is 10%, the content of potassium feldspar is 40%, the content of calcite is 13%, the content of quartz sand is 25%, the content of talc powder is 5%, the content of aluminum oxide is 5%, and the content of zinc oxide is 2%.

[0162] Water is added to the raw materials in step 1, and placed in a rapid ball mill, with the material:ball:water being controlled at 1:2:0.5, and rapid ball milling for 15 min;

[0163] The glaze slurry in step 2 is passed through a 250-mesh standard sieve, and the residue is less than 0.5%;

[0164] The glaze slurry in step 3 is placed in a glaze cup, sealed with plastic wrap, and placed in a dry and cool place for 24 h for aging;

[0165] The supernatant of the aged glaze slurry in step 4 is removed, and then it is stirred uniformly;

[0166] The glazing is performed by immersion glazing, the dust on the surface of the biscuit ceramic body is wiped with a wet sponge, and the water is appropriately supplemented, and then the glazing is performed after the water on the surface of the ceramic body is air dried, the ceramic body is immersed in the glaze for 8-10 s each time, and the glazing can be performed multiple times, so that the thickness of the glaze layer is maintained at 3-4 mm;

[0167] The glazed ceramic body is naturally air dried;

[0168] The sample obtained in step 7 is placed in an electric kiln for firing, starting from room temperature at a temperature rising rate of 5.5 ℃ / min to 600 ℃; then at a temperature rising rate of 3 ℃ / min to 900 ℃; then at a temperature rising rate of 6 ℃ / min to 1200 ℃, and keeping for 30 min; finally, stop heating, and cool down to room temperature with the furnace to obtain a Shino glaze product.

[0169] For easy observation, the light-colored ceramic round pieces are fired by using the light-colored biscuit ceramic body of Comparative Example 4, as shown in Table 4. Figure 3 No. 4 sample.​

[0170] The Shino glaze prepared in this comparative example exhibited severe glaze shrinkage and a dull surface. While the addition of Al2O3 increased the high-temperature viscosity and surface tension of the glaze melt, thus preventing glaze flow, the precipitation of Ca3Al2O6 crystals in the glaze layer also contributed to a dull and lackluster finish, resulting in the loss of the warm, jade-like texture characteristic of Shino glaze. Furthermore, the Shino glaze passing through a 250-mesh sieve suffered from glaze shrinkage due to its excessively fine particles.

[0171] Comparative Example 5

[0172] The materials are weighed according to the following percentages by weight: kaolin content is 10%, potassium feldspar content is 40%, calcite content is 15%, quartz sand content is 25%, talc content is 8%, and zinc oxide content is 2%.

[0173] Add water to the raw material in step 1, place it in a high-speed ball mill, control the ratio of material:ball:water = 1:2:0.5, and ball mill for 15 minutes.

[0174] Pass the glaze slurry from step 2 through a 250-mesh standard sieve, and the residue should be less than 0.5%.

[0175] Pour the glaze slurry from step 3 into a glaze cup, seal it with plastic wrap, and place it in a dry, cool place to age for 24 hours.

[0176] Remove the clear liquid from the top layer of the aged glaze slurry in step 4, and then stir it evenly.

[0177] Glazing is done by dipping the ceramic body in the glaze. First, wipe the dust off the surface of the unglazed ceramic body with a damp sponge and add water as needed. After the surface of the ceramic body is dry, the glaze can be applied. Each time, immerse the ceramic body in the glaze for 8 to 10 seconds. Multiple glazings can be performed to keep the glaze layer thickness between 3 and 4 mm.

[0178] The glazed ceramic body is air-dried naturally;

[0179] The sample obtained in step 7 was placed in an electric kiln for firing. The temperature was increased from room temperature to 600°C at a rate of 5.5°C / min; then increased to 900°C at a rate of 3°C / min; then increased to 1220°C at a rate of 6°C / min and held for 10 minutes; finally, the heating was stopped and the sample was cooled to room temperature in the kiln to obtain the Shino glaze product.

[0180] For easier observation, Comparative Example 5 used a light-colored bisque-fired ceramic body to fire light-colored ceramic discs, see details. Figure 3 Sample No. 5.

[0181] The Shino glaze prepared in this comparative example exhibited severe glaze flow and shrinkage. Excessive potassium feldspar content reduces the glaze viscosity and melting temperature, ultimately leading to severe glaze flow. Shino glaze passing through a 250-mesh sieve resulted in shrinkage due to its excessively fine particles.

Claims

1. A method for preparing Shino glaze products, characterized in that, The preparation method of the Shino glaze includes: A. A glaze slurry is prepared by mixing kaolin, potassium feldspar, calcite, quartz sand, talc, zinc oxide, and water, wherein the mass ratio of kaolin, potassium feldspar, calcite, quartz sand, talc, and zinc oxide is 12-19:31-39:8-12:22-29:10:5; the glaze slurry is ball-milled, with the glaze slurry:ball ratio controlled at 1:1.5-2, and the ball-milling time is 6-8 minutes. B. The glaze slurry is aged for at least 24 hours; C. Mix the aged glaze slurry evenly, and then apply the evenly mixed glaze slurry to the surface of the ceramic body. Apply the glaze by dipping, and the dipping time is 8 to 10 seconds. Through multiple dipping, the glaze layer thickness is made between 3 and 4 mm. D. Dry the glazed ceramic body; E. The ceramic blank dried in step D is fired; the firing process begins at room temperature and the temperature is increased to 500℃ to 600℃ at a rate of 5.5℃ / min to 6℃ / min; then the temperature is increased to 600℃ to 900℃ at a rate of 3℃ / min to 4℃ / min; then the temperature is increased to 1180℃ to 1200℃ at a rate of 6℃ / min to 6.5℃ / min and held for 30 to 40 minutes; finally, the heating is stopped and the ceramic blank is cooled to room temperature in the furnace to obtain the Shino glaze product.

2. The method for preparing Shino glaze products according to claim 1, characterized in that, The total mass of the kaolin, potassium feldspar, calcite, quartz sand, talc, and zinc oxide is M, and the mass ratio of M to water is 1:0.5 to 0.

8.

3. The method for preparing Shino glaze products according to claim 1, characterized in that, The kaolin mentioned is kaolin from the Panxi region.

4. The method for preparing Shino glaze products according to claim 1 or 2, characterized in that, The particle size of the raw materials in the glaze slurry described in step B is below 100 mesh.

5. The method for preparing Shino glaze products according to claim 4, characterized in that, The particle size of the raw materials in the glaze slurry described in step B is 100 mesh to 240 mesh.

6. The method for preparing Shino glaze products according to claim 4, characterized in that, The particle size of the raw materials in the glaze slurry described in step B is 100 mesh to 190 mesh.

7. The method for preparing Shino glaze products according to claim 1, characterized in that, The aging process described in step B is carried out in a sealed, dry, and cool environment.

8. The method for preparing Shino glaze products according to claim 1 or 2, characterized in that, The ceramic body described in step C is a bisque-fired ceramic body.

9. The method for preparing Shino glaze products according to claim 1 or 2, characterized in that, Before glazing, the ceramic body described in step C undergoes a pretreatment process, which includes cleaning the dust off the surface of the ceramic body and adding water as needed. After the surface of the ceramic body dries, glazing can be applied. The appropriate water addition is based on the condition that no air holes or cracks are generated during glazing and the glaze can adhere.

10. The method for preparing Shino glaze products according to claim 1, characterized in that, The drying temperature in step D is less than 60°C.

11. The method for preparing Shino glaze products according to claim 10, characterized in that, The drying process described in step D is natural air drying.

12. Shino glaze products, characterized in that, The Shino glaze product is prepared by the method described in any one of claims 1 to 11, with a whiteness of 67 to 74, a gloss of 23 to 31, a smooth and flat glaze surface, good thermal shock resistance, and no cracking after three heat exchanges at 200 to 200°C.

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