Rose red opaque crack-striped glazed ceramics and preparation method thereof

Abstract

The invention relates to the field of ceramics and preparation methods thereof, and particularly relates to a rose red opaque crack-striped glaze ceramic and a preparation method thereof. The raw materials of the glaze include the following components in parts by weight: 12-15 parts of potassium feldspar, 5-8 parts of dolomite, 12-14 parts of kaolin, 12-14 parts of potassium dichromate, 2-4 parts of chromium oxide, 10-12 parts of silicon ore, 5-8 parts of calcium fluoride, 5-8 parts of calcium sulfate, 2-4 parts of borax, 2-4 parts of zinc oxide, 5-6 parts of ball clay and 2-4 parts of copper carbonate. The sunken strip patterns are inlaid with tin strips by grooving and welding. The tin thickness of the strip patterns is high, so that the glaze surface where the sunken strip patterns are located is rich in tin oxide. Therefore, the shrinkage rate and surface tension of the strip patterns are small, and the viscosity is low. After cooling, the strip patterns crack along the sunken strip patterns to form cracks. The ceramics fired by the present invention have a glaze surface with a fruit green background color, and rose red, sunken, cracked strip patterns are distributed in between, which is unique in beauty.

Description

Technical Field

[0001] The invention relates to the field of ceramics and a preparation method thereof, and in particular to rose red opaque crack-striped glaze ceramics and a preparation method thereof. Background Art

[0002] Opacified glaze, also known as "covering glaze", is an opaque glassy covering layer on the ceramic body that can conceal the color and defects of the body. It is formed by adding an opacifier to an ordinary transparent glaze. In addition, opacity can also be formed when there are a large number of fine bubbles in the glaze layer. The opacity of traditional green glaze is mainly due to this gas phase opacification effect. Tin oxide is a common opacifier. The usual practice is to evenly add an opacifier to the glaze to achieve an opacifying effect on the glaze surface, but it is not possible to achieve a local opacifying effect, and to use the coloring properties of tin oxide to achieve a local color pattern presentation; in order to achieve local tin oxide enrichment, a paint with a high tin content is usually applied to the body, and then a top glaze is applied, but the tin oxide content at this location is still low, the overall color presentation is not obvious, and the overall presentation is single. Summary of the invention

[0003] An object of the present invention is to solve at least the above-mentioned problems by means of rose red opaque crack-striped glaze ceramics and a method for preparing the same.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: rose red opalescent crack-striped glazed ceramics, including a body and a glaze, the glaze is provided with striped patterns, and the raw materials of the glaze, measured by weight, include the following components: 12-15 parts of potassium feldspar, 5-8 parts of dolomite, 12-14 parts of kaolin, 12-14 parts of potassium dichromate, 2-4 parts of chromium oxide, 10-12 parts of silicon ore, 5-8 parts of calcium fluoride, 5-8 parts of calcium sulfate, 2-4 parts of borax, 2-4 parts of zinc oxide, 5-6 parts of ball clay, and 2-4 parts of copper carbonate.

[0005] Preferably, the raw materials of the glaze include the following components in parts by weight: 13 parts of potassium feldspar, 6 parts of dolomite, 13 parts of kaolin, 13 parts of potassium dichromate, 3 parts of chromium oxide, 11 parts of silicon ore, 6 parts of calcium fluoride, 6 parts of calcium sulfate, 3 parts of borax, 3 parts of zinc oxide, 5.5 parts of ball clay, and 3 parts of copper carbonate.

[0006] Preferably, the raw materials of the green body include the following components in parts by weight: 5-8 parts of ball clay, 10-12 parts of kaolin, 8-10 parts of borate, 10-12 parts of bentonite, 12-14 parts of Alberta mud, and 7-9 parts of carboxymethyl cellulose gum.

[0007] Preferably, the raw materials of the green body include the following components in parts by weight: 6 parts of ball clay, 11 parts of kaolin, 9 parts of borate, 11 parts of bentonite, 13 parts of Alberta mud, and 8 parts of carboxymethyl cellulose gum.

[0008] The preparation method of the rose red opaque crack-striped glazed ceramics comprises the following steps:

[0009] Step a, green body forming and drying;

[0010] Step b, carving concave stripe patterns on the surface of the blank;

[0011] Step c, applying a flow-promoting agent in the concave stripe pattern;

[0012] Step d, melting the tin wire in the concave stripe pattern, and embedding the tin wire in the concave stripe pattern after solidification;

[0013] Step e: applying glaze on the body and firing it in a kiln.

[0014] Preferably, in step b, firstly, a concave strip pattern with equal width at the top and bottom is carved, and then a sharp carving knife is used to widen the bottom of the concave strip pattern to form a dovetail groove, and the upper and lower width difference of the dovetail groove is 1-1.5 mm.

[0015] Preferably, in step c, the flow-promoting agent comprises pine oil and carboxymethyl cellulose gum, and the ratio of the pine oil to the carboxymethyl cellulose gum is 1:0.2-0.3.

[0016] Preferably, in step d, the diameter of the tin wire is greater than the width of the concave stripe, and the diameter of the tin wire exceeds the width of the concave stripe by 20-23%.

[0017] Preferably, in step d, an electric soldering iron is used to heat and melt the tin wire so that it melts into the striped patterns. After the tin cools and solidifies in the concave striped patterns, an electric heating scraper is used to scrape off the tin that exceeds the striped patterns and flatten the striped tin so that the tin is flush with the surface of the blank.

[0018] Preferably, in the step e, the glazed body is put into the kiln, the temperature is raised to 800 degrees Celsius within 7-8 hours, and the temperature is kept for 2 hours to maintain an oxidizing atmosphere; the temperature is then further raised to 1250 degrees Celsius within 4 hours, and the temperature is kept for 2-3 hours to maintain an oxidizing atmosphere, and the components of the tin oxide and the glaze react and sink at the stripes to form concave lines with a three-dimensional effect; after natural cooling, the rose red opaque cracked striped glazed ceramic is fired, and the glaze surface where the concave stripes are located is rich in tin oxide, and after cooling, cracks are formed along the concave stripes.

[0019] From the above description, it can be seen that the rose red opalescent crack-striped glazed ceramics and the preparation method thereof provided by the present invention have the following beneficial effects: the sunken stripe patterns are inlaid with tin strips by grooving and welding, and the tin thickness of the stripe patterns is high, so that the glaze surface where the sunken stripe patterns are located is rich in tin oxide, so the shrinkage rate and surface tension of the stripe patterns are small, and the viscosity is low. After cooling, they crack along the sunken stripe patterns to form cracks; the ceramics fired by the present invention have a glaze surface that finally presents a fruit green base color, with rose red, sunken, cracked stripe patterns distributed therein, which is unique in aesthetics. DETAILED DESCRIPTION

[0020] The present invention is further described below through specific implementation modes.

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] The rose red opaque crack-striped glazed ceramic of the present invention comprises a body and a glaze, wherein the glaze is provided with stripe patterns, and the raw materials of the glaze include the following components by weight: 12-15 parts of potassium feldspar, 5-8 parts of dolomite, 12-14 parts of kaolin, 12-14 parts of potassium dichromate, 2-4 parts of chromium oxide, 10-12 parts of silicon ore, 5-8 parts of calcium fluoride, 5-8 parts of calcium sulfate, 2-4 parts of borax, 2-4 parts of zinc oxide, 5-6 parts of ball clay, and 2-4 parts of copper carbonate. At high temperature, the chromium compound in the glaze is Cr2O3, so that the glaze presents a fruit green color.

[0023] The raw materials of the glaze, calculated by weight, include the following components: 13 parts of potassium feldspar, 6 parts of dolomite, 13 parts of kaolin, 13 parts of potassium dichromate, 3 parts of chromium oxide, 11 parts of silicon ore, 6 parts of calcium fluoride, 6 parts of calcium sulfate, 3 parts of borax, 3 parts of zinc oxide, 5.5 parts of ball clay, and 3 parts of copper carbonate.

[0024] As a preferred embodiment: the raw materials of the green body include the following components by weight: 5-8 parts of ball clay, 10-12 parts of kaolin, 8-10 parts of borate, 10-12 parts of bentonite, 12-14 parts of Alberta mud, and 7-9 parts of carboxymethyl cellulose gum. Alberta mud is produced in Alberta, Canada, and can improve the plasticity of the mud. The addition of carboxymethyl cellulose gum can improve the bonding strength and toughness of the green body, so when the green body is grooved, the groove edge is not easy to collapse.

[0025] The raw materials of the green body include the following components in parts by weight: 6 parts of ball clay, 11 parts of kaolin, 9 parts of borate, 11 parts of bentonite, 13 parts of Alberta mud, and 8 parts of carboxymethyl cellulose gum.

[0026] The preparation method of the rose red opaque crack-striped glazed ceramics comprises the following steps:

[0027] Step a, green body forming and drying;

[0028] Step b, carving concave stripes on the surface of the blank, drying the blank at 150-160 degrees Celsius, and then bisque firing in a kiln to fix the shape;

[0029] Step c, applying a flow-promoting agent in the concave stripe pattern;

[0030] Step d, melting the tin wire in the concave stripe pattern, and embedding the tin wire in the concave stripe pattern after solidification;

[0031] Step e: applying glaze on the body and firing it in a kiln.

[0032] After melting and cooling, the tin wire is embedded in the sunken stripes. During the glaze firing process, the tin reacts with other components of the glaze to form tin oxide. The excess tin oxide reacts with the glaze to form a fusion reaction, making the location of the sunken stripes appear rose red. Because tin oxide has an opacifying effect and a lower shrinkage rate than other parts of the glaze, it will cause the sunken stripes to crack and sag. The final fired ceramic glaze has a fruit green base color, with rose red opaque cracked and sunken stripes embedded in it, which is unique in beauty.

[0033] It is difficult to embed tin on the surface of ceramics. If foil solder is used to cover the part of the ceramic to be welded after pickling and other processes, and then pressurized and heated under vacuum to form a metal layer on the surface of the ceramic, the molding conditions of this process have high requirements on equipment. However, the molding process of the present invention only requires the use of existing equipment for ceramic processing, such as carving knives and kilns, without the need for additional production equipment, thereby reducing the processing difficulty and cost, and the thickness of the applied tin strip is relatively high, so the glaze surface after firing has a unique artistic effect; the metal film formed by high temperature and high pressure is relatively thin, and part of the tin oxide will evaporate into the air during the glaze firing process. The thinner tin film cannot provide sufficient tin oxide for the glaze surface, so the crack effect and rose red effect cannot be formed.

[0034] In step b, first engrave the concave strip lines of equal width above and below, and then use a sharp carving knife to widen the bottom of the concave strip lines to form a dovetail groove, the upper and lower width difference of the dovetail groove is 1-1.5mm, the groove depth is 1.5-2.5mm, and the blank adopts a thick blank, which is convenient for engraving the concave strip lines. Engraving the dovetail groove with narrow upper and lower width, after the tin is solidified, a limit is formed in the dovetail groove, which is not easy to fall off, so that the required lines can be accurately expressed, and at the same time, the blank plastic cavity, and carboxymethyl cellulose glue can improve the toughness of the blank, so that the groove edge of the concave strip lines is not easy to collapse during the engraving process; the upper and lower width difference of the dovetail groove needs to be controlled within a certain range, and the width difference is too large, which will cause the groove edge to collapse easily, but if there is a small amount of local collapse, it can be ignored, because the concave strip lines covered with tin are connected as a whole, and the local collapse has little effect on its bonding strength.

[0035] In step c, the flow promoting agent includes pine oil and carboxymethyl cellulose glue, and the ratio of pine oil to carboxymethyl cellulose glue is 1:0.2-0.3. The role of pine oil is: the tin wire has a low melting point and poor fluidity. In the narrow and compact space of the concave stripe pattern, it is difficult to control the shape of tin so that the tin can flow along the stripe pattern. Since the melting point of rosin is lower, the specific gravity, melting point and surface tension are smaller than those of tin wire. Rosin is first melted and flow-impregnated to cover the concave stripes of the blank, blocking air from contacting the tin wire, so that the oxidation reaction on the surface of the tin cannot proceed, and the fluidity of the tin is improved, and its trajectory and shape are more easily controlled, so that the inlay of the tin is more controllable; the carboxymethyl cellulose glue in the flow agent can improve the viscosity of the tin bar and the blank after heating, so that the tin is not easy to fall off.

[0036] In step d, the diameter of the tin wire is larger than the width of the concave stripe, and the diameter of the tin wire exceeds the width of the concave stripe by 20-23%. The diameter of the tin wire should be appropriate so that when it is melt-welded, it can be partially embedded in the stripe to guide its trajectory, and partially protrude from the concave stripe to be fully heated.

[0037] In step d, an electric soldering iron is used to heat and melt the tin wire so that it melts into the stripe pattern. After the tin cools and solidifies in the concave stripe pattern, an electric heating scraper is used to scrape off the tin beyond the stripe pattern and flatten the stripe tin so that the tin is flush with the surface of the blank. Before using the electric heating scraper, pine oil is applied on the surface and surrounding of the tin to improve the fluidity of the tin and avoid scraping off the tin inside the concave stripe when scraping off the excess tin. The width of the electric heating scraper is greater than the concave stripe pattern and moves along the length direction of the stripe. The tin is flush with the surface of the blank. After glazing, the glaze surface is flat on the glaze surface. Since the stripe pattern is oxidized to tin oxide during the firing process, and part of it evaporates into the air, the glaze sinks at the stripe pattern during the firing process, forming a concave pattern with a three-dimensional sense.

[0038] In step e, the glazed body is put into the kiln, and the temperature is raised to 800 degrees Celsius within 7-8 hours, and the temperature is kept for 2 hours to maintain an oxidizing atmosphere. The tin in the concave stripes is gradually oxidized to tin oxide, and the surface glaze corresponding to the concave stripes is enriched with tin oxide to form an opacifying effect; then the temperature is further raised to 1250 degrees Celsius within 4 hours, and the temperature is kept for 2-3 hours to maintain an oxidizing atmosphere. The tin oxide reacts with the components of the surface glaze, and the tin oxide, chromium oxide, silicon dioxide, and calcium carbonate minerals fuse to form Tin titanite forms rose red stripes, and part of the tin oxide enriched during the glaze firing process evaporates into the air through the surface glaze, so the glaze sinks at the stripe lines during the firing process, forming concave lines with a three-dimensional sense; after natural cooling, the rose red opaque cracked stripe glazed ceramic is fired, and the glaze surface where the concave stripe lines are located is rich in tin oxide, so the shrinkage rate and surface tension of the stripe lines are small, and the viscosity is low. After cooling, it cracks along the concave stripe lines to form cracks. The ceramic fired by the present invention has a glaze surface that finally presents a fruit green background color, with rose red, concave, cracked stripes distributed in between, which is unique in beauty.

[0039] The preparation method of the glaze for the top glaze is as follows: mix and grind potassium feldspar, dolomite, kaolin, silica ore, borax, zinc oxide, ball clay, and copper carbonate, then add potassium dichromate, chromium oxide, calcium fluoride, and calcium sulfate in sequence and mix evenly, place in a kiln, calcine at 1350 degrees Celsius, take out, crush and grind, pass through a 200-mesh sieve, and then add water to prepare a slurry.

[0040] The above are only some specific implementation methods of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A method for preparing rose red opaque crack-striped glazed ceramics, characterized in that: The steps include: Step a, green body forming and drying; Step b, carving concave stripe patterns on the surface of the blank; Step c, applying a flow-promoting agent in the concave stripe pattern; Step d, melting the tin wire in the concave stripe pattern, and embedding the tin wire in the concave stripe pattern after solidification; Step e, applying glaze on the body and firing it in a kiln; In the step e, the glazed body is put into the kiln, and the temperature is raised to 800 degrees Celsius within 7-8 hours, and the temperature is kept for 2 hours to maintain an oxidizing atmosphere; the temperature is then further raised to 1250 degrees Celsius within 4 hours, and the temperature is kept for 2-3 hours to maintain an oxidizing atmosphere, and the components of the tin oxide and the surface glaze react and sink at the concave stripe lines to form concave lines with a three-dimensional effect; after natural cooling, the rose red opaque cracked stripe glazed ceramic is fired, and the glaze surface at the location of the concave stripe lines is rich in tin oxide, and cracks are formed along the concave stripe lines after cooling; The rose red opaque crack-striped glazed ceramic comprises a body and a glaze, wherein the glaze is provided with stripe patterns, and the raw materials of the glaze include the following components in parts by weight: 12-15 parts of potassium feldspar, 5-8 parts of dolomite, 12-14 parts of kaolin, 12-14 parts of potassium dichromate, 2-4 parts of chromium oxide, 10-12 parts of silicon ore, 5-8 parts of calcium fluoride, 5-8 parts of calcium sulfate, 2-4 parts of borax, 2-4 parts of zinc oxide, 5-6 parts of ball clay, and 2-4 parts of copper carbonate.

2. The preparation method of the rose red opaque crack-striped glazed ceramic according to claim 1: the raw materials of the glaze, measured by weight, include the following components: 13 parts of potassium feldspar, 6 parts of dolomite, 13 parts of kaolin, 13 parts of potassium dichromate, 3 parts of chromium oxide, 11 parts of silicon ore, 6 parts of calcium fluoride, 6 parts of calcium sulfate, 3 parts of borax, 3 parts of zinc oxide, 5.5 parts of ball clay, and 3 parts of copper carbonate.

3. The preparation method of rose red opaque crack-striped glazed ceramics according to claim 1: the raw materials of the green body, measured by weight, include the following components: 5-8 parts of ball clay, 10-12 parts of kaolin, 8-10 parts of borate, 10-12 parts of bentonite, 12-14 parts of Alberta mud, and 7-9 parts of carboxymethyl cellulose gum.

4. The preparation method of rose red opaque crack-striped glazed ceramics according to claim 1: the raw materials of the green body, measured by weight, include the following components: 6 parts of ball clay, 11 parts of kaolin, 9 parts of borate, 11 parts of bentonite, 13 parts of Alberta mud, and 8 parts of carboxymethyl cellulose gum.

5. The method for preparing the rose red opaque crack-striped glazed ceramic according to claim 1, characterized in that: In the step b, firstly, a concave strip pattern with equal width at the top and bottom is carved, and then the bottom of the concave strip pattern is widened with a sharp carving knife to form a dovetail groove, wherein the upper and lower width difference of the dovetail groove is 1-1.5 mm.

6. The method for preparing the rose red opaque crack-striped glazed ceramic according to claim 1, characterized in that: In the step c, the flow-promoting agent includes pine oil and carboxymethyl cellulose gum, and the ratio of the pine oil to the carboxymethyl cellulose gum is 1:0.2-0.

3.

7. The method for preparing the rose red opaque crack-striped glazed ceramic according to claim 1, characterized in that: In the step d, the diameter of the tin wire is greater than the width of the concave stripe pattern, and the extent to which the diameter of the tin wire exceeds the width of the concave stripe pattern is 20-23% of the width of the concave stripe pattern.

8. The method for preparing the rose red opaque crack-striped glazed ceramic according to claim 1, characterized in that: In the step d, an electric soldering iron is used to heat and melt the tin wire so that it melts into the concave stripe patterns. After the tin cools and solidifies in the concave stripe patterns, an electric heating scraper is used to scrape off the tin that exceeds the concave stripe patterns and to flatten the tin in the concave stripe patterns so that the tin is flush with the surface of the blank.