Bubble art glaze and preparation method of glazed foamed ceramic

Abstract

The invention relates to the technical field of ceramics, in particular to glazed foamed ceramic and bubble art glaze thereof. The oxide is prepared from the following chemical components in percentage by mass: 56 + / -2% of silicon dioxide, 9.0 + / -0.5% of aluminum oxide, 8.0 + / -1% of calcium oxide, 3.5 + / -1% of magnesium oxide, 5.5 + / -1% of zinc oxide, 12.0 + / -1% of potassium oxide, 3.5 + / -1% of sodium oxide, 2.5 + / -0.5% of diboron trioxide and 0-1.5% of colored metal oxide. The foaming agent raw materials comprise high-temperature decomposition type carbonate and high-temperature reaction type silicon carbide or silicon-oxygen-carbon. The glaze surface is devitrified, opacifying and matte, the carbonate foaming agent is completely decomposed and escaped on the glaze surface in the early stage to form a rough and uneven effect, silicon carbide or silicon-oxygen-carbon reacts in an oxidizing atmosphere at 1025 + / -25 DEG C to generate foaming gas, the foaming gas is matched with a boron element, and the temperature is rapidly increased to the highest firing temperature to promote glaze bubbles to break through the glaze surface to form open bubbles.

Description

Technical Field

[0001] This invention relates to the field of ceramic technology, specifically to a glazed foamed ceramic and its bubble art glaze. Background Technology

[0002] Glaze is a thin, glassy layer covering the surface of ceramic, enamel, and other ceramic bodies. It is obtained through grinding, glazing, and firing. Based on the different appearance characteristics after firing, glazes can be divided into transparent glazes, crackle glazes, crystalline glazes, opaque glazes, and bubble glazes. Bubble glazes are usually made from raw materials such as low-temperature molten metal, feldspar, kaolin, quartz, talc, foaming agents, and colorants, through processes such as ball milling, glazing, and firing. The foaming mechanism of foam glazes is that during the high-temperature melting process of the glaze, the foaming agent generates gas, which foams in the glaze melt. After cooling, a large number of open or closed bubbles are formed in the glaze layer, thus giving the glaze surface a foamed effect. Summary of the Invention

[0003] The purpose of this invention is to provide a glazed foamed ceramic and its bubble art glaze, the glaze being matte and opaque with numerous small open bubbles.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: The bubble art glaze has the following oxide chemical composition by mass percentage: silicon dioxide 56±2%, aluminum oxide 9.0±0.5%, calcium oxide 8.0±1%, magnesium oxide 3.5±1%, zinc oxide 5.5±1%, potassium oxide 12.0±1%, sodium oxide 3.5±1%, boron trioxide 2.5±0.5%, and coloring metal oxides 0-1.5%. The bubble art glaze also contains foaming agent raw materials, including high-temperature decomposition carbonates and high-temperature reaction silicon carbide or silicon-oxygen-carbon.

[0005] Preferably, the coloring metal oxide is one or more of iron oxide, cobalt oxide, chromium oxide, and nickel oxide.

[0006] Preferably, the carbonate is magnesium carbonate and calcium carbonate.

[0007] The present invention further provides a method for preparing glazed foamed ceramics, which specifically includes the following steps: S1. Grinding: Except for the high-temperature reactive foaming agent, the foaming glaze in the bubble art glaze is loaded into a ball mill and ball-milled to the target particle size. The loading amount is 45%-50% of the ball mill volume. S2. After ball milling, add a high-temperature reactive foaming agent, stir and mix, pour out and age to obtain a glaze slurry; S3. Apply the glaze slurry to the surface of the body, allow it to dry naturally, and then fire it. The specific firing process is as follows: S31. Slowly raise the temperature to 450±50℃ and hold for 30±10 minutes. S32. Change the atmosphere to a reducing atmosphere and rapidly heat to 850±50℃, then hold the temperature for 30±10 min. S33. Control the heating rate to raise the temperature to 1025±25℃; S34. When the temperature reaches 1025±25℃, the atmosphere is changed to an oxidizing atmosphere. The temperature is raised to 1220±20℃ and held at the highest firing temperature for 45±15 minutes.

[0008] Preferably, the target particle size for grinding in step S1 is 200-250 mesh.

[0009] Preferably, the Baume degree of the glaze slurry in step S2 is in the range of 47-52.

[0010] Preferably, the ratio of ball material to water in step S2 is 1:0.5-0.6:0.6-0.8.

[0011] Preferably, the heating rate in step S31, which raises the temperature to 450±50℃, is 4℃ / min-6℃ / min.

[0012] Preferably, the heating rate in step S32, which raises the temperature to 850±50℃, is 8℃ / min-10℃ / min, and the heating rate in step S33, which raises the temperature to 1025±25℃, is 4℃ / min-6℃ / min.

[0013] Preferably, the heating rate in step S34, which raises the temperature to 1220±20℃, is 8℃ / min-10℃ / min.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The bubble art glaze of this invention contains a high-temperature decomposition carbonate foaming agent and a high-temperature reaction silicon carbide or silicon-oxygen carbon. The carbonate foaming agent completely decomposes and escapes on the glaze surface during the process of heating from 450±50℃ to 850±50℃ and during the holding firing process, forming a rough and uneven effect. At the same time, it inhibits the reaction of silicon carbide or silicon-oxygen carbon until the atmosphere is changed and the temperature is raised to 1025±25℃, where more free oxygen ions appear. Silicon carbide or silicon-oxygen carbon reacts to generate foaming gas. The addition of boron helps to reduce the surface tension of the glaze melt. Combined with rapid heating to the maximum firing temperature, it promotes the glaze bubbles to break through the glaze surface and form open bubbles, which are densely distributed.

[0015] The bubble art glaze of this invention adds more calcium and zinc elements to the base glaze to make the glaze surface opaque and turbid, and controls the silicon-aluminum ratio at 6.1-6.6 to make the glaze surface matte. Attached Figure Description

[0016] Figure 1 This is a partial schematic diagram of the glaze surface of the foamed ceramic prepared in Example 1 of the present invention. Detailed Implementation

[0017] Example 1 This embodiment provides a method for preparing glazed foamed ceramics, which specifically includes the following steps: S0. Material preparation: Accurately weigh each component of the bubble art glaze according to the formula. The bubble art glaze includes the base glaze and the foaming agent. The base glaze is mixed and set aside. The foaming agent raw materials include high-temperature decomposition type magnesium carbonate and calcium carbonate, as well as high-temperature reaction type silicon carbide or silicon-oxygen-carbon. The magnesium carbonate and calcium carbonate are mixed into the base glaze.

[0018] Prepare the base glaze and colorant according to the following mass percentages of oxides: silicon dioxide 55.97%, aluminum oxide 8.55%, calcium oxide 8.27%, magnesium oxide 3.28%, zinc oxide 5.66%, potassium oxide 12.18%, sodium oxide 3.48%, and boron trioxide 2.61%.

[0019] S1. Grinding: Except for the high-temperature reactive foaming agent, the foaming glaze in the bubble art glaze is loaded into a ball mill and ball milled. The loading amount is 45% of the ball mill volume, the ball material water ratio is 1:0.55:0.65, the ball milling speed is 400 r / min, and the ball milling is carried out until the average particle size is 250 mesh.

[0020] S2. After ball milling, add a high-temperature reactive foaming agent. The amount of the high-temperature reactive foaming agent silicon carbide is 0.15% of the mass of the base glaze. Stir and mix, pour out, and age to obtain a glaze slurry with a Baume degree range of 50.

[0021] S3. Apply the glaze slurry to the surface of the body, let it dry naturally, and then fire it. The specific firing process is as follows: S31. Slowly raise the temperature to 450℃ at a heating rate of 5℃ / min and hold it for 30min; S32. Change the atmosphere to a reducing atmosphere and rapidly raise the temperature to 900℃ at a heating rate of 10℃ / min, and hold it for 30min; S33. Control the heating rate to raise the temperature to 1025℃ at a heating rate of 5℃ / min; S34. When the temperature reaches 1025℃, change to an oxidizing atmosphere and raise the temperature to 1220℃ at a heating rate of 10℃ / min, and hold it for 45min at the highest firing temperature.

[0022] Example 2 This embodiment provides a method for preparing glazed foamed ceramics, which specifically includes the following steps: S0. Material preparation: Accurately weigh each component of the bubble art glaze according to the formula. The bubble art glaze includes a base glaze, a foaming agent, and a colorant. The base glaze and colorant are mixed together for later use. The foaming agent raw materials include high-temperature decomposition type magnesium carbonate and calcium carbonate, as well as high-temperature reaction type silicon carbide or silicon-oxygen-carbon. Magnesium carbonate and calcium carbonate are mixed into the base glaze.

[0023] Prepare the base glaze and colorant according to the following mass percentages of oxides: silicon dioxide 56.28%, aluminum oxide 8.81%, calcium oxide 8.65%, magnesium oxide 3.52%, zinc oxide 5.21%, potassium oxide 11.19%, sodium oxide 3.02%, boron trioxide 2.32%, iron oxide 0.2%, and cobalt oxide 0.8%.

[0024] S1. Grinding: Except for the high-temperature reactive foaming agent, the foaming agent in the bubble art glaze is loaded into a ball mill and ball milled. The loading amount is 48% of the ball mill volume, the ball material water ratio is 1:0.6:0.8, the ball milling speed is 450 r / min, and the ball milling is carried out until the average particle size is 200 mesh.

[0025] S2. After ball milling, add a high-temperature reactive foaming agent. The amount of the high-temperature reactive foaming agent, silica-carbon, is 0.15% of the mass of the base glaze. Stir and mix, pour out, and age to obtain a glaze slurry with a Baume degree range of 52.

[0026] S3. Apply the glaze slurry to the surface of the body, let it dry naturally, and then fire it. The specific firing process is as follows: S31. Slowly raise the temperature to 400℃ at a heating rate of 4℃ / min and hold it for 30min; S32. Change the atmosphere to a reducing atmosphere and rapidly raise the temperature to 860℃ at a heating rate of 8℃ / min, and hold it for 30min; S33. Control the heating rate to raise the temperature to 1050℃ at a heating rate of 5℃ / min; S34. When the temperature reaches 1050℃, change to an oxidizing atmosphere and raise the temperature to 1220℃ at a heating rate of 8℃ / min, and hold it for 60min at the highest firing temperature.

[0027] The foregoing has shown and described the basic principles, main features and advantages of this invention. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of this invention. Various changes and modifications can be made to this invention without departing from the spirit and scope of this invention. All such changes and modifications fall within the scope of this invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. Bubble art glaze, characterized in that, The oxide chemical composition of this bubble art glaze, by mass percentage, is as follows: silicon dioxide 56±2%, aluminum oxide 9.0±0.5%, calcium oxide 8.0±1%, magnesium oxide 3.5±1%, zinc oxide 5.5±1%, potassium oxide 12.0±1%, sodium oxide 3.5±1%, boron trioxide 2.5±0.5%, and coloring metal oxides 0-1.5%. Furthermore, this bubble art glaze contains foaming agent raw materials, including high-temperature decomposition carbonates and high-temperature reaction silicon carbide or silicon-oxygen-carbon.

2. The bubble art glaze according to claim 1, characterized in that: The coloring metal oxide is one or more of iron oxide, cobalt oxide, chromium oxide, and nickel oxide.

3. The bubble art glaze according to claim 1, characterized in that: The carbonates are magnesium carbonate and calcium carbonate.

4. A method for preparing glazed foamed ceramics, characterized in that, Specifically, the steps include the following: S1. Grinding: The bubble art glaze as described in any one of claims 1 to 3, excluding the high-temperature reactive foaming agent, is loaded into a ball mill and ball-milled to the target particle size, with the loading amount being 45%-50% of the ball mill volume; S2. After ball milling, add a high-temperature reactive foaming agent, stir and mix, pour out and age to obtain a glaze slurry; S3. Apply the glaze slurry to the surface of the body, allow it to dry naturally, and then fire it. The specific firing process is as follows: S31. Slowly raise the temperature to 450±50℃ and hold for 30±10 minutes. S32. Change the atmosphere to a reducing atmosphere and rapidly heat to 850±50℃, then hold the temperature for 30±10 min. S33. Control the heating rate to raise the temperature to 1025±25℃; S34. When the temperature reaches 1025±25℃, the atmosphere is changed to an oxidizing atmosphere. The temperature is raised to 1220±20℃ and held at the highest firing temperature for 45±15 minutes.

5. The method for preparing glazed foamed ceramics according to claim 4, characterized in that: The target particle size for grinding in step S1 is 200-250 mesh.

6. The method for preparing glazed foamed ceramics according to claim 4, characterized in that: The Baume degree of the glaze slurry in step S2 is in the range of 47-52.

7. The method for preparing glazed foamed ceramics according to claim 4, characterized in that: The ratio of ball material to water in step S2 is 1:0.5-0.6:0.6-0.

8.

8. The method for preparing glazed foamed ceramics according to claim 4, characterized in that: The heating rate in step S31, which raises the temperature to 450±50℃, is 4℃ / min-6℃ / min.

9. The method for preparing glazed foamed ceramics according to claim 4, characterized in that: The heating rate in step S32, which raises the temperature to 850±50℃, is 8℃ / min-10℃ / min, and the heating rate in step S33, which raises the temperature to 1025±25℃, is 4℃ / min-6℃ / min.

10. The method for preparing glazed foamed ceramics according to claim 4, characterized in that: The heating rate in step S34, which raises the temperature to 1220±20℃, is 8℃ / min-10℃ / min.

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