Multicoloured four-time firing process

Abstract

A colorful four-time firing process relates to the technical field of ceramic product appearance decoration, and adopts a four-time firing process and one-time biscuiting: drying and fettling after an implement is formed, decorating patterns on the surface, brushing and corroding with an aqueous solution to enable the surface to be in a concave-convex shape, and firing in an electric kiln to 700 DEG C; secondary biscuiting: cleaning the surface, spraying ground coat, separately dyeing, and biscuiting to 900 DEG C in an electric kiln; third biscuit firing: applying various colored glazes for 10-12 times according to a formula and a picture effect, and performing biscuit firing in an electric kiln to 850 DEG C; and glaze firing: grinding and drying the utensil, applying internal glaze water, and performing glaze firing. According to the technology, water erosion carving is combined, through three times of low-temperature biscuiting and one time of high-temperature glaze firing, the surface of the ceramic product is shown in an image pattern, the technology is wider in expression range, high in stability, high in operability and clearer in pattern effect layer.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic product appearance decoration, and in particular to a colorful four-time firing process. Background Art

[0002] In the production process of ceramics, the decoration before glaze firing is relatively simple, usually using colored glaze or underglaze painting as a surface treatment, which makes the surface pattern of ceramic products single and poor in appearance. In order to solve this problem, the inventor applied for invention patent CN 106187326 A "A colorful production process" in 2016 and was authorized in 2018. Different color pastes are used for vertical lines and spraying / brushing to form complex and delicate natural textures on the surface of ceramic products. The ceramic products made have a strong decorative sense, highlighting the exquisite workmanship, grace and elegance of ceramics.

[0003] However, after years of research, the inventors found that the "a kind of colorful production process" in CN 106187326 A is only suitable for vertical line or point color expression, and cannot achieve the expression of concrete patterns. How to display concrete patterns on the surface of ceramic products has become the key research and development topic of the inventors in recent years. Summary of the invention

[0004] The present invention provides a four-time firing process for colorful patterns to solve the technical problem that the production of colorful patterns in the prior art is only suitable for vertical line or point color expression, and cannot achieve the expression of concrete patterns.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A colorful four-time firing process adopts a four-time firing process, including three low-temperature bisque firings and one high-temperature glaze firing. The specific process steps are as follows: (1) Primary bisque firing: After the object is formed, it is dried, trimmed, and the surface is decorated with patterns. A protective agent is applied according to the picture. After being etched with an aqueous solution, the surface is made concave and convex with a depth of more than 2 mm, and then fired in an electric kiln at 700°C. (2) Secondary bisque firing: clean the surface, spray the base glaze according to the vertical lines of the picture, the specific gravity of the glaze should be between 1.50 and 1.55, dye it, and put it into the electric kiln for bisque firing at 900℃; (3) Three-time bisque firing: According to the picture effect, apply various colored glazes 10 to 12 times according to the formula, the specific gravity of the glaze is between 1.30-1.35, and then put it into the electric kiln for bisque firing at 850℃; (4) Glaze firing: Grind the object, use 300-grit water-based sandpaper to gently grind it in water, then dry it, apply internal glaze, and glaze it. Use an electric dual-purpose kiln to fire it from room temperature to 800°C within 4 hours, add liquefied gas or natural gas, and the pressure is 0.01MPa; the temperature rises to 1000°C within 1 hour, stop the gas, normalize and keep warm for 0.5 hours; after the insulation is completed, add gas, the pressure is 0.025MPa, and the strong reduction stage is maintained for 2 hours; when the temperature is burned to 1200°C, gradually reduce the gas pressure to 0.001MPa, the process takes about 2 hours; the temperature rises to 1350°C, use a No. 11 temperature cone, observe its softening, pour it out and keep warm for 20 minutes.

[0006] In the above step (1), the protective agent is obtained by placing a shellac sheet in a container and immersing it in a high concentration ethanol solution to dissolve it.

[0007] The present invention can show a more accurate shape after combining with water erosion carving. In order to remove the protective agent of water erosion carving, the first bisque firing is added. The second bisque firing is based on the fact that continuous glazing of thick glaze will often cause glaze shrinkage, and the temperature is higher than the third bisque firing, which will produce a slight touch after glaze firing. Therefore, it is adjusted to a "four-firing process" of three low-temperature bisque firings combined with one high-temperature glaze firing.

[0008] The process of the present invention combines water erosion carving with three low-temperature bisque firings and one high-temperature glaze firing to achieve the display of concrete patterns on the surface of ceramic products. The process of the present invention has a wider performance range, high stability, strong operability, and clearer pattern effect levels. DETAILED DESCRIPTION

[0009] A colorful four-time firing process adopts a four-time firing process, including three low-temperature bisque firings and one high-temperature glaze firing. The specific process steps are as follows: (1) Primary bisque firing: After the object is formed, it is dried, trimmed, and the surface is decorated with patterns. A protective agent is applied according to the picture. The protective agent is obtained by placing shellac sheets in a container and immersing them in a high-concentration ethanol solution. After being etched with the aqueous solution, the surface becomes concave and convex with a depth of more than 2 mm. It is then put into an electric kiln and fired at 700°C. (2) Secondary bisque firing: clean the surface, spray the base glaze according to the vertical lines of the picture, the specific gravity of the glaze should be between 1.50 and 1.55, dye it, and put it into the electric kiln for bisque firing at 900℃; (3) Three-time bisque firing: According to the picture effect, apply various colored glazes 10 to 12 times according to the formula, the specific gravity of the glaze is between 1.30-1.35, and then put it into the electric kiln for bisque firing at 850℃; (4) Glaze firing: Grind the object, use 300-grit water-based sandpaper to gently grind it in water, then dry it, apply internal glaze, and glaze it. Use an electric dual-purpose kiln to fire it from room temperature to 800°C within 4 hours, add liquefied gas or natural gas, and the pressure is 0.01MPa; the temperature rises to 1000°C within 1 hour, stop the gas, normalize and keep warm for 0.5 hours; after the insulation is completed, add gas, the pressure is 0.025MPa, and the strong reduction stage is maintained for 2 hours; when the temperature is burned to 1200°C, gradually reduce the gas pressure to 0.001MPa, the process takes about 2 hours; the temperature rises to 1350°C, use a No. 11 temperature cone, observe its softening, pour it out and keep warm for 20 minutes.

Claims

1. The four-time firing process of colorful porcelain is characterized by The four-firing process is adopted, including three low-temperature bisque firings and one high-temperature glaze firing. The specific process steps are as follows: (1) Primary bisque firing: After the object is formed, it is dried, trimmed, and the surface is decorated with patterns. A protective agent is applied according to the picture. After being etched with an aqueous solution, the surface is made concave and convex with a depth of more than 2 mm, and then fired in an electric kiln at 700°C. (2) Secondary bisque firing: clean the surface, spray the base glaze according to the vertical lines of the picture, the specific gravity of the glaze should be between 1.50 and 1.55, dye it, and put it into the electric kiln for bisque firing at 900℃; (3) Three-time bisque firing: According to the picture effect, apply various colored glazes 10 to 12 times according to the formula, the specific gravity of the glaze is between 1.30-1.35, and then put it into the electric kiln for bisque firing at 850℃; (4) Glaze firing: Grind the object gently with 300-grit water sandpaper in water, then dry it, apply internal glaze, and glaze fire it. Use an electric dual-purpose kiln to fire it from room temperature to 800°C within 4 hours, add liquefied gas or natural gas, and the pressure is 0.01MPa; the temperature rises to 1000°C within 1 hour, and the gas is turned off and the normalizing is kept warm for 0.5 hours; After the insulation is completed, add gas with a pressure of 0.025MPa, and maintain the strong reduction stage for 2 hours; when the temperature reaches 1200℃, gradually lower the gas pressure to 0.001MPa, and the process takes about 2 hours; the temperature rises to 1350℃, use No. 11 temperature cone, observe its softening, pour and keep warm for 20 minutes.

2. The colorful four-time firing process according to claim 1 is characterized in that In step (1), the protective agent is obtained by placing a shellac sheet in a container and immersing it in a high concentration ethanol solution to dissolve it.