Blood red glaze and preparation method thereof

Abstract

The invention discloses a blood red glaze and a preparation method thereof, and belongs to the technical field of inorganic non-metallic materials, the blood red glaze comprises the following components by mass percentage: 20-30% of feldspar, 55-65% of loess, 6-10% of quartz, 2-4% of plant ash, and 5-7% of iron oxide; the preparation method comprises the following steps: performing crushing treatment and ball milling on a glaze raw material to obtain glaze slip, coating a biscuit with the glaze slip, performing drying treatment to obtain a biscuit containing a glaze layer, performing high-temperature sintering on the biscuit containing the glaze layer in a sectional heating manner in a strong oxidizing atmosphere, and then cooling to room temperature to obtain the blood red glaze. According to the preparation method, the content of ferric oxide and the oxidizing atmosphere are controlled, the microstructure of a glaze layer and the crystallization behavior of ferric oxide are regulated and controlled, and a large number of stable hematite crystals are formed on the surface in the glaze in the sintering process, so that the dark red glaze color effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a blood-red glaze and a preparation method thereof. Background Art

[0002] Blood red glaze is colored by hematite and is widely used in ceramic crafts, tiles, ceramics and other fields. Its unique red effect makes it an ideal choice for decorating ceramic objects. The main coloring atom of traditional red glaze is Cu. With the continuous advancement of science and technology and the development of ceramic technology, the emergence of iron red glaze has brought new possibilities and opportunities to the ceramic industry. This new glaze is deeper in color, giving ceramic products a different experience in color, texture and appearance.

[0003] These studies have made important contributions to the preparation of iron-based colored glazes. However, there are relatively few existing methods for preparing red glazes using iron oxide as the main coloring substance. Common hematite crystals often appear in the preparation of silver glazes, brown glazes, and black glazes. Currently, it is rare to see hematite crystals as the main dark red coloring substance. This preparation method uses hematite as the main coloring substance to obtain a blood-red glaze porcelain. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a blood-red glaze and a preparation method thereof. By controlling the content of iron oxide and the oxidizing atmosphere, the microstructure of the glaze layer and the crystallization behavior of iron oxide are regulated, and a large number of stable hematite crystals are formed on the surface of the glaze during the sintering process, thereby presenting a deep red glaze effect.

[0005] The present invention is achieved through the following technical solutions: A blood-red glaze, which includes, by mass percentage, 20-30% feldspar, 55-65% loess, 6-10% quartz, 2-4% wood ash, and 5-7% iron oxide.

[0006] Preferably, the glaze layer of the blood-red glaze is ε-Fe2O3 crystals and is orange-red in color.

[0007] A method for preparing blood-red glaze comprises the following steps: Step 1, crushing and ball-milling the glaze raw materials to obtain glaze slurry; Step 2, coating the glaze slurry on the green body and drying it to obtain the green body containing the glaze layer; Step 3, in a strong oxidizing atmosphere, the green body containing the glaze layer is sintered at high temperature by a stepwise heating method, and then cooled to room temperature to obtain a blood-red glaze; First, the furnace temperature was increased to 1000-1050 ℃ at a heating rate of 3 ℃ / min, then increased to 1200-1250 ℃ at a heating rate of 1 ℃ / min and kept at this temperature for 20 min, then increased to 1300 ℃ at a heating rate of 2 ℃ / min and kept at this temperature for 60 min, then decreased to 900 ℃ and kept at this temperature for 30 min, and finally cooled to room temperature.

[0008] Preferably, the glaze slurry is prepared by wet ball milling in step 1 as follows: The glaze raw material is crushed to obtain a glaze, and the glaze, ball mill stone and water are mixed in a ratio of 1:1:1 and ball milled to obtain a glaze slurry.

[0009] Preferably, the glaze slurry has a specific gravity of 1.50-1.70 g / cm 3 .

[0010] Preferably, during the wet ball milling process, the ball milling speed is 280-340 r / min, and the ball milling time is 50-70 min.

[0011] Preferably, the thickness of the glaze layer is 1-2 mm.

[0012] Preferably, the biscuit sintering temperature of the biscuit is 800-900°C.

[0013] A porcelain comprises a porcelain embryo and the blood-red glaze attached to the surface of the porcelain embryo.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a blood-red glaze, wherein the glaze slurry is applied to a nearly fired biscuit for drying, and then the dried biscuit is sintered. During the sintering process, the furnace temperature is raised to 1200-1250°C and kept warm for 20 min, then the furnace temperature is raised to 1300°C and kept warm for 60 min, then the temperature is lowered to 900°C and kept warm for 30 min, and a blood-red color is formed on the body after cooling. By changing the amount of iron oxide added and controlling the oxidizing atmosphere, the microstructure of the glaze layer and the crystallization behavior of iron oxide are regulated, so that stable and fine hematite crystals are generated on the glaze surface, thereby presenting an obvious blood-red glaze. It is the hematite crystals precipitated on the surface of the glaze layer that make the glaze color deep red, revealing the relationship between the change in the glaze layer structure and the color of the glaze surface. The preparation method is simple and controllable, and shows a deeper color and luster than the blood-red glaze prepared by the existing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a 25um annular illumination image of the blood-red glaze prepared by the present invention; Figure 2 This is a gold color chart of the iron red gold glaze of the present invention; Figure 3 This is the Raman diagram of the iron red gold glaze prepared in the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0019] A blood-red glaze, which includes, by mass percentage, 20-30% feldspar, 55-65% loess, 6-10% quartz, 2-4% wood ash, and 5-7% iron oxide.

[0020] The surface of the glaze layer of the blood-red glaze is composed of fine ε-Fe2O3 crystals and presents an orange-red effect.

[0021] A method for preparing iron red gold glaze comprises the following steps: Step 1, crushing and ball-milling the glaze raw materials to obtain glaze slurry; The glaze raw materials include, by mass percentage, 20-30% feldspar, 55-65% loess, 6-10% quartz, 2-4% plant ash, and 5-7% iron oxide.

[0022] The glaze slurry is wet ball milled. After the raw materials are evenly mixed according to the above percentages, they are added into water for ball milling to obtain the glaze slurry. The fineness is 200 mesh, the sieve residue is less than 1%, and the specific gravity of the glaze slurry is adjusted to 1.50-1.70 g / cm3 .

[0023] During the wet ball milling process, the ratio of glaze: ball mill stone: water is 1:1:1, the ball milling speed is set to 280-340 r / min, and the ball milling time is 50-70 min.

[0024] Step 2, applying the prepared glaze slurry to the almost fired green body by dipping glaze method and then drying the green body to obtain the green body with glaze layer; The biscuit is formed by high-temperature biscuit firing at a temperature of 800-900° C. The thickness of the glaze layer is 1-2 mm.

[0025] Step 3: sinter the obtained green body containing the glaze layer at high temperature by means of staged heating, and always keep the firing environment in a strong oxidizing atmosphere, so as to obtain a blood-red glaze on the surface of the green body and a dark red color on the surface of the blank.

[0026] The high temperature sintering method of the blank is as follows: The blank was placed in an electric furnace for firing. The firing process adopted multi-stage heating. The furnace temperature was raised to 1000-1050 ℃ at a heating rate of 3 ℃ / min, and then raised to 1200-1250 ℃ at a heating rate of 1 ℃ / min and kept warm for 20 min. Then, the furnace temperature was raised to 1300 ℃ at a heating rate of 2 ℃ / min and kept warm for 60 min. The temperature was then lowered to 900 ℃ and kept warm for 30 min. Finally, it was cooled to room temperature.

[0027] This method regulates the microstructure of the glaze layer and the crystallization behavior of iron oxide by changing the amount of iron oxide added and controlling the oxidizing atmosphere, so that a large number of stable hematite crystals are generated on the glaze surface, presenting a deep blood red color. This method has achieved a higher level of improvement in color, texture and appearance of ceramic products.

[0028] Example 1 A method for preparing iron red gold glaze comprises the following steps: Step 1, crushing and ball-milling the glaze raw materials to obtain glaze slurry; The glaze raw materials include, by mass percentage, 20% feldspar, 65% loess, 4% quartz, 4% wood ash, and 7% iron oxide.

[0029] The above raw materials were mixed evenly to obtain glaze raw materials. The glaze raw materials, ball milling stone and water were mixed evenly in a ratio of 1:1:1 and then wet ball milled. The ball milling speed was set to 280 r / min and the ball milling time was 70 min. After wet ball milling, glaze slurry was obtained with a fineness of 200 mesh and a sieve residue of less than 1%. The specific gravity of the glaze slurry was 1.70 g / cm 3 .

[0030] Step 2: Apply the prepared glaze slurry to the almost fired green body by dipping method and then dry it to obtain the green body containing a glaze layer, wherein the thickness of the glaze layer is 1 mm.

[0031] Step 3: In a strong oxidizing atmosphere, the green body containing the glaze layer obtained in step 2 is subjected to high-temperature sintering in a step-by-step heating manner to obtain iron red gold glaze.

[0032] The obtained green body containing the glaze layer is sintered at high temperature by means of staged heating, and the firing environment is always kept in a strong oxidizing atmosphere, so that a blood-red glaze is obtained on the surface of the green body, and the surface of the blank is dark red.

[0033] The high temperature sintering method of the blank is as follows: The blank was placed in an electric furnace for firing. The furnace temperature was first raised to 1050°C at a heating rate of 3°C / min, then raised to 1200°C at a heating rate of 1°C / min and kept warm for 20 min, then raised to 1300°C at a heating rate of 2°C / min and kept warm for 60 min, then cooled to 900°C and kept warm for 30 min, and finally cooled to room temperature to obtain iron red gold glaze.

[0034] Example 2 A method for preparing iron red gold glaze comprises the following steps: Step 1, crushing and ball-milling the glaze raw materials to obtain glaze slurry; The glaze raw materials include, by mass percentage, 30% feldspar, 55% loess, 7% quartz, 2% wood ash, and 6% iron oxide.

[0035] The above raw materials were mixed evenly to obtain glaze raw materials. The glaze raw materials, ball milling stone and water were mixed evenly in a ratio of 1:1:1 and then wet ball milled. The ball milling speed was set to 300 r / min and the ball milling time was 60 min. After wet ball milling, glaze slurry was obtained with a fineness of 200 mesh and a sieve residue of less than 1%. The specific gravity of the glaze slurry was 1.60 g / cm 3 .

[0036] Step 2: Apply the prepared glaze slurry to the almost fired green body by dipping method and then dry it to obtain the green body containing a glaze layer, wherein the thickness of the glaze layer is 1.5 mm.

[0037] Step 3: In a strong oxidizing atmosphere, the green body containing the glaze layer obtained in step 2 is subjected to high-temperature sintering in a step-by-step heating manner to obtain iron red gold glaze.

[0038] The obtained green body containing the glaze layer is sintered at high temperature by means of staged heating, and the firing environment is always kept in a strong oxidizing atmosphere, so that a blood-red glaze is obtained on the surface of the green body, and the surface of the blank is dark red.

[0039] The high temperature sintering method of the blank is as follows: The blank was placed in an electric furnace for firing. The furnace temperature was first raised to 1000°C at a heating rate of 3°C / min, then raised to 1220°C at a heating rate of 1°C / min and kept at this temperature for 20 min, then raised to 1300°C at a heating rate of 2°C / min and kept at this temperature for 60 min, then cooled to 900°C and kept at this temperature for 30 min, and finally cooled to room temperature to obtain iron red gold glaze.

[0040] Example 3 A method for preparing iron red gold glaze comprises the following steps: Step 1, crushing and ball-milling the glaze raw materials to obtain glaze slurry; The glaze raw materials include, by mass percentage, 23% feldspar, 57% loess, 10% quartz, 3% wood ash, and 7% iron oxide.

[0041] The above raw materials were mixed evenly to obtain glaze raw materials. The glaze raw materials, ball milling stone and water were mixed evenly in a ratio of 1:1:1 and then wet ball milled. The ball milling speed was set to 340 r / min and the ball milling time was 70 min. After wet ball milling, glaze slurry was obtained with a fineness of 200 mesh and a sieve residue of less than 1%. The specific gravity of the glaze slurry was 1.70 g / cm 3 .

[0042] Step 2: Apply the prepared glaze slurry to the almost fired green body by dipping method and then dry it to obtain the green body containing a glaze layer, wherein the thickness of the glaze layer is 1.5 mm.

[0043] Step 3: In a strong oxidizing atmosphere, the green body containing the glaze layer obtained in step 2 is subjected to high-temperature sintering in a step-by-step heating manner to obtain iron red gold glaze.

[0044] The obtained green body containing the glaze layer is sintered at high temperature by means of staged heating, and the firing environment is always kept in a strong oxidizing atmosphere, so that a blood-red glaze is obtained on the surface of the green body, and the surface of the blank is dark red.

[0045] The high temperature sintering method of the blank is as follows: The blank was placed in an electric furnace for firing. The furnace temperature was first raised to 1050°C at a heating rate of 3°C / min, then raised to 1250°C at a heating rate of 1°C / min and kept at this temperature for 20 min, then raised to 1300°C at a heating rate of 2°C / min and kept at this temperature for 60 min, then cooled to 900°C and kept at this temperature for 30 min, and finally cooled to room temperature to obtain iron red gold glaze.

[0046] See also Figure 1, 25um annular illumination image of iron red gold glaze, the small red crystals precipitated on its surface are hematite, which is the coloring substance of the glaze with deep red color; Figure 2 This is the gold intensity diagram of iron red gold glaze. The color of the glaze surface is measured using a spectrophotometer. Its absorption peak is observed to confirm that the color is dark red; Figure 3 This is the Raman image of the iron red gold glaze. The red crystal particles on the surface of the glaze were tested and it was confirmed that the precipitated crystals were hematite.

[0047] Example 4 A kind of porcelain, including a porcelain embryo and a blood-red glaze attached to its surface.

[0048] The preparation method of the iron red gold, by changing the amount of iron oxide added and controlling the oxidizing atmosphere, regulates the microstructure of the glaze layer and the crystallization behavior of iron oxide, so that fine and stable hematite crystals are generated on the glaze surface, thereby presenting a deep blood-red glaze; compared with the existing preparation method, the red glaze prepared in this application shows a deeper color and uses a simpler and easier to control colorant. Blood-red glaze is a very distinctive ceramic glaze color, which is bright and deep, as vivid and full of vitality as flowing blood. This glaze color has a strong visual impact, which can instantly attract the viewer's attention, giving people a strong visual shock and a deep impression. It not only enriches the color language of ceramics, but also provides more possibilities and space for ceramic creation, and promotes the continuous development and innovation of ceramic art.

[0049] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A blood-red glaze, characterized in that: By mass percentage, it includes 20-30% feldspar, 55-65% loess, 6-10% quartz, 2-4% wood ash, and 5-7% iron oxide.

2. The blood-red glaze according to claim 1, characterized in that: The glaze layer of the blood-red glaze is ε-Fe2O3 crystals and is orange-red in color.

3. A method for preparing the blood-red glaze according to claim 1 or 2, characterized in that: The following steps are involved: Step 1, crushing and ball-milling the glaze raw materials to obtain glaze slurry; Step 2, coating the glaze slurry on the green body and drying it to obtain the green body containing the glaze layer; Step 3, in a strong oxidizing atmosphere, the green body containing the glaze layer is sintered at high temperature by a stepwise heating method, and then cooled to room temperature to obtain a blood-red glaze; First, the furnace temperature was increased to 1000-1050 ℃ at a heating rate of 3 ℃ / min, then increased to 1200-1250 ℃ at a heating rate of 1 ℃ / min and kept at this temperature for 20 min, then increased to 1300 ℃ at a heating rate of 2 ℃ / min and kept at this temperature for 60 min, then decreased to 900 ℃ and kept at this temperature for 30 min, and finally cooled to room temperature.

4. The method for preparing the blood-red glaze according to claim 3, characterized in that: In step 1, the glaze slurry is prepared by wet ball milling as follows: The glaze raw material is crushed to obtain a glaze, and the glaze, ball mill stone and water are mixed in a ratio of 1:1:1 and ball milled to obtain a glaze slurry.

5. The method for preparing blood-red glaze according to claim 3, characterized in that: The specific gravity of the glaze slurry is 1.50-1.70 g / cm 3 .

6. The method for preparing blood-red glaze according to claim 4, characterized in that: During the wet ball milling process, the ball milling speed is 280-340 r / min, and the ball milling time is 50-70 min.

7. The method for preparing blood-red glaze according to claim 3, characterized in that: The thickness of the glaze layer is 1-2 mm.

8. The method for preparing blood-red glaze according to claim 3, characterized in that: The biscuit sintering temperature is 800-900°C.

9. A porcelain, characterized in that: The invention comprises a porcelain embryo and the blood-red glaze according to any one of claims 1 or 2 attached to the surface of the porcelain embryo.

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