CN117658590A - Method for solving glazing defects of solid double-glazed porcelain - Google Patents
Method for solving glazing defects of solid double-glazed porcelain Download PDFInfo
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- CN117658590A CN117658590A CN202311340743.9A CN202311340743A CN117658590A CN 117658590 A CN117658590 A CN 117658590A CN 202311340743 A CN202311340743 A CN 202311340743A CN 117658590 A CN117658590 A CN 117658590A
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- 239000007787 solid Substances 0.000 title claims abstract description 27
- 230000007547 defect Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 20
- 239000000919 ceramic Substances 0.000 claims abstract description 74
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 239000010433 feldspar Substances 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 11
- 239000011148 porous material Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000000748 compression moulding Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/04—Clay; Kaolin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/24—Manufacture of porcelain or white ware
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/32—Burning methods
- C04B33/34—Burning methods combined with glazing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5022—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with vitreous materials
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
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- C04B41/86—Glazes; Cold glazes
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- Inorganic Chemistry (AREA)
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Abstract
The invention relates to the technical field of glazing porcelain processing and production, in particular to a method for solving the glazing defect of a solid double-faced glazed porcelain; the method comprises the following steps: s1, uniformly mixing and stirring raw materials for the blank and additives to obtain pug for standby, S2, preparing glaze slurry, S3, and detachably installing a proper number of thin rods or filaments at proper positions in a forming die according to factors such as thickness, material, area, sintering degree and the like of a ceramic blank. According to the invention, a thin rod is inserted into a forming die or a thin wire is preset at a proper position of the die, and an exhaust channel with an outlet at a position where glazing is not needed is formed on a ceramic body.
Description
Technical Field
The invention relates to the technical field of glazing porcelain processing and production, in particular to a method for solving the glazing defect of a solid double-faced glazed porcelain.
Background
The glaze is a colorless or colored vitreous thin layer covered on the surface of ceramic products, and is prepared by grinding mineral raw materials (feldspar, quartz, talcum, kaolin and the like) and other raw materials according to a certain proportion (part of raw materials can be firstly prepared into a frit) to prepare glaze slurry, applying the glaze slurry to the surface of a green body and calcining the glaze slurry at a certain temperature.
In the prior art, when a solid ceramic blank with two glazed surfaces is sintered at a high temperature, gas is required to be discharged continuously in the process of melting and densification of the blank, and the externally wrapped glaze is melted into a dense molten slurry state, and bubbles still break through the glaze surface until the sintering is finished because the exhaust distance of the gas in the blank is far enough or the gas is completely wrapped by the glaze layer, so that holes with different sizes are formed on the surface of a final product, and the surface of the ceramic is not bright and dirt-absorbing, so that in the existing ceramic industry, thick blanks with larger area, solid, ceramic and double-sided glazed ceramic products can not be produced at present; in order to produce large ceramic products, the large ceramic blank can be made into a hollow structure, but in the mode, the ceramic product is forced to change the structure and the surface is easy to deform, and in addition, the blank can be made into a ceramic material, but the blank has low strength and is easy to crack;
in order to solve the defects of solid double-sided glazed ceramic surface glaze bubbles or glaze pores, two prior technical schemes are adopted:
(1) Slowing down the firing speed: the time is multiplied, but the fuel consumption is greatly increased, the defects of deformation, glaze flowing and the like caused by the increase of the fuel consumption are greatly increased, and the glaze is still difficult to ensure that serious glaze defects are avoided;
(2) The green body is made of ceramic (non-sintered) material, namely, the green body is not sintered: the water absorption rate of the material is up to about 10%, and the material aims at discharging the gas in Wen Shipi with about 10% of pores from the blank to the end, but the blank has low strength, poor thermal stability and water absorption expansion at later stage to cause cracking of the product.
In summary, developing a method for solving the glazed defect of the solid double-glazed porcelain is still a key problem to be solved in the technical field of enamel ware processing and production.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a method for solving the glazing defects of a solid double-sided glazed porcelain, in the method, a thin rod is inserted into a forming die or a thin wire is preset at a proper position of the die, an exhaust channel with an outlet at a position where glazing is not needed is formed on a ceramic body, when the ceramic body is melted in the ceramic glaze, gas in the ceramic body can be discharged through the exhaust channel, the defects of glaze bubbles, glaze pores and the like are avoided, the surface of the ceramic is brighter and is not polluted, and meanwhile, the ceramic body can be completely vitrified, and has high strength, good thermal stability, high flatness of the ceramic surface and small deformation.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for solving the glazing defect of solid double-glazed porcelain comprises the following steps:
s1, uniformly mixing and stirring raw materials for the blank and additives to obtain pug for standby;
s2, preparing glaze slip;
s3, according to the factors such as the thickness, the material, the area, the sintering degree and the like of the ceramic blank, a proper number of thin rods or thin filaments are detachably arranged at a proper position in a forming die;
s4, injecting the pug into a forming die, and forming by using the die to obtain a wet blank for later use;
s5, after grouting or pressing to form a wet green body, extracting a thin rod or a thin wire (suitable materials can not be extracted) from the wet green body, namely forming an exhaust channel with an outlet positioned at a position where glazing is not needed on the ceramic green body;
s6, taking out the ceramic blank from the forming die;
s7, applying glaze slurry on the surface of the formed ceramic blank body to form a glaze layer;
and S8, sintering in a kiln to obtain the double-faced glazed porcelain.
The invention is further provided with: in the step S1, the blank raw materials comprise feldspar, quartz, kaolin, chemical raw materials and the like.
The invention is further provided with: in step S1, the additive includes additives for ceramics such as sodium silicate, silica gel, bentonite, and the like.
The invention is further provided with: in step S3, one end of the thin rod or filament is located outside the position on the ceramic body where glazing is not needed to form an outlet, and the other end of the thin rod or filament extends into the deep inside the solid ceramic body where double-sided glazing is needed, and the outlet of the position where glazing is needed can be blocked after the ceramic body is formed into a blank.
Advantageous effects
Compared with the prior art, the technical proposal provided by the invention has the following advantages that
The beneficial effects are that:
(1) In the invention, when preparing a solid ceramic product needing double-sided glazing, only a thin rod or a preset filament is needed to be inserted into a forming die according to factors such as the thickness, the material, the area, the sintering degree and the like of a ceramic blank, and after a wet blank is formed by grouting or pressing, the thin rod or the filament is extracted from the wet blank (the proper material can not be extracted), namely, an exhaust channel with an outlet positioned at a non-glaze position is formed on the ceramic blank, and the outlet of the exhaust channel is not positioned on a smooth glaze surface, so that the damage to the glaze surface is avoided; when the ceramic body is melted in the sintering process, the gas in the ceramic body can be discharged through the exhaust channel, so that the gas with too long discharge distance in the ceramic body can not break the glaze surface at high temperature, the defects of glaze bubbles, glaze pores and the like can be avoided (or reduced), the ceramic product with the glaze surface defect easily produced at the solid body can be produced, the surface of the ceramic is brighter and the ceramic is not polluted, and the solid double-sided glazed ceramic product with larger area can be produced.
(2) In the invention, the thin rod or the thin wire inserted on the forming die can be used once or repeatedly, and the thin rod or the thin wire is simple to install, low in cost and free from any environmental pollution; meanwhile, the ceramic body can be completely vitrified, the ceramic body has high strength, good thermal stability, high flatness of the ceramic surface and small deformation, in addition, the selection range of the raw glaze material is large, the production cost is greatly reduced, the hidden danger of water absorption expansion and cracking in the later period is avoided, and the glaze surface is smooth and clean and does not absorb dirt.
Drawings
FIG. 1 is a process flow diagram of a method for resolving glaze defects in a solid double-glazed porcelain.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is further described below with reference to examples.
Referring to fig. 1, a method for solving the glazing defect of a solid double-glazed porcelain comprises the following steps:
step one, mixing and stirring raw materials for the blank and additives uniformly to obtain pug for standby;
the blank material is composed of feldspar, quartz, kaolin, chemical raw materials and the like, and the additives comprise sodium silicate, silica gel, bentonite and other ceramic additives.
And step two, preparing glaze slip.
Step three, according to the factors such as the thickness, the material, the area, the sintering degree and the like of the ceramic blank, a proper number of thin rods or thin filaments are detachably arranged at a proper position in a forming die;
wherein, one end of the thin rod or the thin wire is positioned outside the position on the ceramic body which does not need glazing to form an outlet, the other end of the thin rod or the thin wire stretches into the deep inside the solid ceramic body which needs double-sided glazing, and the outlet of the position which needs glazing can be blocked after the blank is formed.
And fourthly, injecting the pug into a forming die, and forming by using the die to obtain a wet blank for standby.
And fifthly, after the wet green body is subjected to grouting or compression molding, extracting the thin rods or filaments (suitable materials can not be extracted) from the wet green body, namely, forming an exhaust channel with an outlet positioned at a position where glazing is not needed on the ceramic green body.
And step six, taking out the ceramic blank from the forming die.
And step seven, applying glaze slurry on the surface of the formed ceramic body to form a glaze layer.
And step eight, sintering in a kiln to obtain the double-faced glazed porcelain.
When the method is adopted to prepare the solid double-glazed porcelain, firstly, the blank and the reinforcing agent are mixed and stirred uniformly to obtain pug for standby, and the required glaze slip is prepared; then according to the factors of thickness, material, area, sintering degree and the like of the ceramic body, a proper number of thin rods or filaments are detachably arranged at proper positions in a forming die, wherein one ends of the thin rods or filaments are positioned outside the non-glazing positions on the ceramic body to form outlets, the other ends of the thin rods or filaments extend into the deep inside of the solid ceramic body to be glazed on both sides, and the outlets of the positions to be glazed can be blocked after the blank is formed; injecting the pug into a forming die, and grouting or press forming by using the die to obtain a wet blank for later use; after grouting or compression molding of the wet green body, extracting the thin rods or filaments from the wet green body (the flexible combustible filaments can not be extracted, and channels are naturally formed after combustion at a lower temperature), namely, forming an exhaust channel with an outlet positioned at a position where glazing is not needed on the ceramic green body; taking out the ceramic blank from the forming die; applying glaze slurry on the surface of the formed ceramic blank to form a glaze layer; finally, sintering the blank by adopting a kiln to obtain the double-faced glazed porcelain;
when the solid ceramic product with double-sided glazing is prepared, a thin rod or a preset filament is only required to be inserted into a forming die according to factors such as the thickness, the material, the area and the sintering degree of a ceramic blank, and after the wet blank is formed by grouting or pressing, the thin rod or the filament is extracted from the wet blank, namely, an exhaust channel (a channel required by gas discharge during sintering) with an outlet positioned at a non-glaze position is formed on the ceramic blank, and the outlet of the exhaust channel is not positioned on a smooth glaze surface, so that the damage to the glaze surface is avoided;
when the ceramic body is melted in the sintering process, the gas in the ceramic body can be discharged through the exhaust channel, so that the gas with too long discharge distance in the ceramic body can not break the glaze surface at high temperature, the defects of glaze bubbles, glaze pores and the like can be avoided (or reduced), the ceramic product with the glaze surface defect easily produced at the solid body can be produced, the surface of the ceramic is brighter and the ceramic is not polluted, and the ceramic product with the solid double-sided glazing with larger area can be produced; the thin rod or the thin wire can be used once or repeatedly, and the thin rod or the thin wire is simple to install, low in cost and free of any environmental pollution; meanwhile, the ceramic body can be completely vitrified, the ceramic body has high strength, good thermal stability, high flatness of the ceramic surface and small deformation, in addition, the selection range of the raw glaze material is large, the production cost is greatly reduced, the hidden danger of water absorption expansion and cracking in the later period is avoided, and the glaze surface is smooth and clean and does not absorb dirt.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The method for solving the glazing defect of the solid double-faced glazed porcelain is characterized by comprising the following steps of:
s1, uniformly mixing and stirring raw materials for the blank and additives to obtain pug for standby;
s2, preparing glaze slip;
s3, according to the factors such as the thickness, the material, the area, the sintering degree and the like of the ceramic blank, a proper number of thin rods or thin filaments are detachably arranged at a proper position in a forming die;
s4, injecting the pug into a forming die, and forming by using the die to obtain a wet blank for later use;
s5, after grouting or pressing to form a wet green body, extracting a thin rod or a thin wire (suitable materials can not be extracted) from the wet green body, namely forming an exhaust channel with an outlet positioned at a position where glazing is not needed on the ceramic green body;
s6, taking out the ceramic blank from the forming die;
s7, applying glaze slurry on the surface of the formed ceramic blank body to form a glaze layer;
and S8, sintering in a kiln to obtain the double-faced glazed porcelain.
2. The method for solving the glazing defect of solid double glazed porcelain according to claim 1, wherein in step S1, the blank material is composed of feldspar, quartz, kaolin, chemical raw materials and the like.
3. A method for solving the glazing defect of solid double glazed porcelain according to claim 1, wherein in step S1, the additive includes additives for ceramics such as sodium silicate, silica gel and bentonite.
4. The method for solving the glazing defect of solid double glazed porcelain according to claim 1, wherein in the step S3, one end of the thin rod or filament is positioned outside the part of the ceramic body which is not required to be glazed to form an outlet, the other end of the thin rod or filament extends into the deep inside of the solid ceramic body which is required to be glazed on both sides, and the outlet of the part which is required to be glazed can be blocked after being formed into a blank.
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| CN119100760A (en) * | 2024-08-28 | 2024-12-10 | 潮州市华中陶瓷实业有限公司 | High-strength domestic ceramic and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119100760A (en) * | 2024-08-28 | 2024-12-10 | 潮州市华中陶瓷实业有限公司 | High-strength domestic ceramic and preparation method thereof |
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