Grayish blue glaze and firing method thereof

[0027] Example 1

[0028] This embodiment is performed according to the following steps:

[0029] 1) First, prepare the following components according to the total weight percentage: quartz: 32.88%; feldspar: 38%; talc: 11%; clay: 2%; limestone: 6%; alumina: 3%; zirconium silicate: 7% ; Manganese oxide: 0.01%; iron oxide: 0.1%; chromium oxide: 0.01%, of which zirconium silicate is 3 micron grade;

[0030] 2) Then put the above solid raw material components into a drying room respectively for baking, in which the moisture mass percentage content of quartz, clay and feldspar is controlled within 5%; the moisture mass percentage content of other solid raw material components is controlled within Within 1%;

[0031] 3) According to the raw material ratio, add all the raw material components to the ball mill one by one, and add water, and the mass percentage content of the water is required to be controlled at 32%. Ball mill for 12 hours to form a glaze slurry;

[0032] 4) Pass the glaze slurry through a 200-mesh sieve;

[0033] 5) Use an iron remover to remove iron from the sieved glaze slurry, and then use a 140 mesh/inch screen to check the iron. If there are more than 2 iron points, return to the iron remover and remove iron until If the number of iron points is not more than 2, the glaze slurry is deemed qualified;

[0034] 6) Store the above-qualified glaze slurry in the tank, add 1% water by mass percentage, and cover the tank cover for aging. The glaze slurry should be aged for no less than two weeks. During the aging period, stir the glaze slurry every day , The mixing time is not less than half an hour every day;

[0035] 7) Then adjust the moisture mass percentage of the stale glaze slurry to 32%, and then put it into the glaze slurry mixing tank, open the spray gun to spray the body, the thickness of the first spray is 0.1mm, the first spray After spraying the glaze, use a hot air blower to dry the surface of the green body, and then spray the glaze for the second time. The thickness of the second glaze spray is 0.3mm, and a hot air blower blows hot air next to the two glaze sprays;

[0036] 8) Put the body sprayed with the glaze slurry into the drying room for 8 hours; then load it into the drawer kiln. The firing is mainly divided into low-fire heating stage, oxidation stage, medium-fire heat preservation stage and reduction stage , High-fire heat preservation stage, cooling stage; the specific parameters of each stage are as follows:

[0037] Low-fire heating stage: heating from room temperature to 300℃, the heating rate at this stage is 10℃/h; oxidation stage: heating from 300℃ to 980℃, heating speed is maintained at 25℃/h; medium heat holding stage: from Raise the temperature from 980°C to 990°C. In this stage, the oxygen content in the kiln should be controlled at 8% while ensuring the temperature is stable; reduction stage: heating up from 990°C to high retention temperature, this stage is divided into strong reduction period and weak Reduction period and oxygen permeation period; the strong reduction period takes 9 hours, from 990℃ to 1130℃, the volume content of CO in the kiln is controlled at 5%; the weak reduction period takes 4 hours, from 1130℃ to 1130℃ 1200℃, the volume content of CO in the kiln is controlled at 1%; the oxygen permeation period takes 4 hours, from 1200℃-stop fire temperature, it is required to pass enough air on the basis of weak reduction, while ensuring A certain gas flow rate to prevent sudden drop in temperature in the kiln and ensure that the kiln contains free oxygen. The volume content of CO in the kiln is controlled below 2%, and the volume content of oxygen is controlled at 1%; high-fire heat preservation stage: in the fire stop The temperature point is kept for 1 hour. At this stage, the amount of air and gas must be controlled to ensure that the oxygen content is about 5%; the cooling stage: the fire-stop temperature-room temperature, the whole process takes 30 hours; when the cooling stage is completed Fire into a gray-blue glaze.

[0038] Example 2

[0039] This embodiment is performed according to the following steps:

[0040] 1) First, prepare the following components according to the total weight percentage: quartz: 30%; feldspar: 32%; talc: 9%; clay: 3.2%; limestone: 9%; alumina: 5%; zirconium silicate: 9% ; Manganese oxide: 0.05%; iron oxide: 0.4%; chromium oxide: 0.05%; cobalt oxide: 0.3%; dispersant: 1%; sodium carboxymethyl cellulose: 1%; among them, zirconium silicate is of 3 micron grade, The dispersant is ceramic dispersant A15;

[0041] 2) Then put the above solid raw material components into a drying room for baking, in which the moisture mass percentage content of quartz, clay and feldspar is controlled within 5%: the moisture mass percentage content of other solid raw material components is controlled within Within 1%;

[0042] 3) Add all the raw material components to the ball mill one by one according to the raw material ratio, and add water. The mass percentage content of the water is required to be controlled at 36%. Ball mill for 15 hours to form a glaze slurry:

[0043] 4) Pass the glaze slurry through a 200-mesh sieve;

[0044] 5) Use an iron remover to remove iron from the sieved glaze slurry, and then use a 140 mesh/inch screen to check the iron. If there are more than 2 iron points, return to the iron remover and remove iron until If the number of iron points is not more than 2, the glaze slurry is deemed qualified;

[0045] 6) Store the above-qualified glaze slurry in the tank, add 2% water by mass percentage, and cover the cylinder cover for aging. The glaze slurry should be aged for no less than two weeks. During the aging period, the glaze slurry should be stirred every day , The mixing time is not less than half an hour every day;

[0046] 7) Then adjust the moisture mass percentage of the stale glaze slurry to 36%, and then put it into the glaze slurry mixing kettle, open the spray gun to spray the glaze on the green body, and the thickness of the first spray glaze is 0.2mm. After spraying the glaze, use a hot air blower to dry the surface of the green body, and then spray the glaze for the second time. The thickness of the second glaze spray is 0.5mm, and a hot air blower blows hot air next to the two glaze sprays;

[0047] 8) Put the body sprayed with the glaze slurry into the drying room for 24 hours; then load it into the drawer kiln. The firing is mainly divided into low-fire heating stage, oxidation stage, medium-fire heat preservation stage, and reduction stage , High-fire heat preservation stage, cooling stage; the specific parameters of each stage are as follows:

[0048] Low-fire heating stage: heating from room temperature to 300℃, the heating rate at this stage is 15℃/h; oxidation stage: heating from 300℃ to 980℃, the heating speed is maintained at 45℃/h; medium heat holding stage: from 980℃ is raised to 990℃. In this stage, the oxygen content in the kiln is controlled at 12% while ensuring the temperature is stable; reduction stage: the temperature is raised from 990℃ to high retention temperature. This stage is divided into strong reduction stage and weak Reduction period and oxygen permeation period; the strong reduction period takes 13 hours, from 990°C to 1130°C, and the volume content of CO in the kiln is controlled at 2%; the weak reduction period takes 6 hours, from 1130°C to 1130°C 1200℃, the volume content of CO in the kiln is controlled at 3%; the oxygen permeation period takes 5 hours, from 1200℃-stop fire temperature, it is required to pass enough air on the basis of weak reduction, while ensuring A certain gas flow rate to prevent sudden drop in temperature in the kiln and to ensure that the kiln contains free oxygen. The volume content of CO in the kiln should be controlled below 2%, and the volume content of oxygen should be controlled at 5%; high-fire heat preservation stage: during fire suppression The temperature point is kept for 2 hours. At this stage, the amount of air and gas must be controlled to ensure that the oxygen content is about 5%; the cooling stage: the flame-stop temperature-room temperature, the whole process takes 45 hours; when the cooling stage is completed Fire into a gray-blue glaze.

[0049] The above raw material ratio and firing method adopt traditional equipment in the firing process of gray-blue glaze, which fully meets the requirements of mass production. This firing method can not only greatly improve the appearance quality and glaze performance of porcelain parts, but also And it can guarantee a high qualified rate of products and has good economic benefits.