CN111807873A - High-strength ceramic glazed tile and preparation method thereof - Google Patents
High-strength ceramic glazed tile and preparation method thereof Download PDFInfo
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- CN111807873A CN111807873A CN202010648915.9A CN202010648915A CN111807873A CN 111807873 A CN111807873 A CN 111807873A CN 202010648915 A CN202010648915 A CN 202010648915A CN 111807873 A CN111807873 A CN 111807873A
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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
- 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
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/86—Glazes; Cold glazes
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/14—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/14—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
- C03C8/16—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions with vehicle or suspending agents, e.g. slip
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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
- 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
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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Abstract
The invention discloses a high-strength ceramic glazed tile and a preparation method thereof, wherein the high-strength ceramic glazed tile comprises a strength enhancing glaze layer, a ceramic body layer and a surface glaze layer, wherein the strength enhancing glaze layer is positioned on the bottom surface of the ceramic body layer, and the surface glaze layer is positioned on the upper surface of the ceramic body layer; the water absorption of the strength enhancing glaze layer is less than that of the ceramic body layer, and the difference between the water absorption of the strength enhancing glaze layer and the water absorption of the ceramic body layer is less than or equal to 5 percent; the raw materials of the strength-enhancing glaze layer at least comprise three frits, and the expansion coefficients of the three frits are different. According to the technical scheme, the strength enhancing glaze is applied to the surface of the high-strength ceramic glazed tile, so that the surface of the finished glazed tile is consistent, and the strength of the glazed tile can be effectively improved. Further, the preparation method of the high-strength ceramic glazed tile is beneficial to preventing the falling of the strength enhancing glaze, ensures consistent hue and improved strength of the finished ceramic glazed tile, and has simple process and strong operability.
Description
Technical Field
The invention relates to the technical field of building ceramics, in particular to a high-strength ceramic glazed tile and a preparation method thereof.
Background
Because the glazed tile production process is to sinter the body layer after glazing, because the glazed layer bears the decorative effect and usually uses better raw material production, manufacturers in order to reduce the cost, the body layer mostly selects cheap raw materials, because of the difference of the quality of the raw materials of the glazed layer and the body layer, the hue of the bottom and the face of the finished product of the body is different, commonly called as 'two layers of skins', especially the difference of whiteness and oxidation degree is obvious, so that the hue of the bottom surface of the finished product of the ceramic tile is different from the hue of the side surface and the top surface of the finished product of the ceramic tile.
The strength of the finished ceramic tile product is indicative of the life cycle of the ceramic tile, and therefore ceramic tile manufacturing enterprises and consumers desire high strength ceramic tile products. When the ceramic tile strength is required to be detected clearly in the ceramic tile strength detection method specified by the current national standard (GB/T3810.1-2006), the front face of a ceramic tile is upward or the glaze surface of the ceramic tile is upward, the front face of a general ceramic tile is glazed or is decorated, polished, smooth and flat, back lines are formed during the pressing of the back face of the ceramic tile, roughness and unevenness are realized, the density of the back face is weaker than that of the front face, the front face is upward, the back face is downward when the ceramic tile strength is detected, pressure is applied from top to bottom and is gradually increased until the ceramic tile cracks, the bottom of the ceramic tile cracks firstly when the ceramic tile cracks, and therefore the fracture resistance and the stretch resistance of the. Therefore, how to improve the anti-fracture capability and the anti-stretching capability of the back of the ceramic tile to improve the strength of the ceramic tile becomes a difficult problem in front of people.
Disclosure of Invention
The invention aims to provide a high-strength ceramic glazed tile, wherein strength enhancing glaze is applied to the tile surface of the high-strength ceramic glazed tile, so that the surface of a finished glazed tile product is consistent, and the strength of the glazed tile can be effectively improved.
The invention also aims to provide a preparation method of the high-strength ceramic glazed tile, which is beneficial to preventing the falling of the strength enhancing glaze, ensuring consistent hue and improved strength of the finished ceramic glazed tile product, and has simple process and strong operability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-strength ceramic glazed tile comprises a strength enhancing glaze layer, a ceramic body layer and a surface glaze layer, wherein the strength enhancing glaze layer is positioned on the bottom surface of the ceramic body layer, and the surface glaze layer is positioned on the upper surface of the ceramic body layer;
the water absorption rate of the strength enhancing glaze layer is less than that of the ceramic body layer, and the difference value between the water absorption rate of the strength enhancing glaze layer and the water absorption rate of the ceramic body layer is less than or equal to 5%;
the raw materials of the strength enhancing glaze layer at least comprise three frits, and the three frits have different expansion coefficients.
Preferably, the strength-enhancing glaze layer comprises the following raw material components in parts by weight: 20-30 parts of first expansion frit, 40-50 parts of second expansion frit, 0-10 parts of third expansion frit, 2-8 parts of calcined talc, 4-10 parts of calcined clay, 5-11 parts of kaolin and 2-8 parts of potassium feldspar.
Preferably, the strength-enhancing glaze layer comprises the following raw material components in parts by weight: 25 parts of first expansion frit, 45 parts of second expansion frit, 5 parts of third expansion frit, 5 parts of calcined talc, 7 parts of calcined clay, 8 parts of kaolin and 5 parts of potash feldspar.
Preferably, the strength enhancing glaze layer is also arranged on the side surface of the ceramic body layer;
the strength enhancing glaze layer is divided into a bottom strength enhancing glaze layer and a side strength enhancing glaze layer, the bottom strength enhancing glaze layer is positioned on the bottom surface of the body layer, and the side strength enhancing glaze layer is positioned on the side surface of the body layer.
The preparation method of the high-strength ceramic glazed tile is characterized by comprising the following steps:
A. adding the raw material of the strength enhancing glaze into a ball mill according to the proportion to prepare the strength enhancing glaze;
B. adding the overglaze raw materials into a ball mill according to the proportion, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain overglaze;
C. b, applying the overglaze cloth in the step B on the upper surface of the ceramic brick blank to form an overglaze layer;
D. b, applying the strength enhancement glaze cloth in the step A to the bottom surface and/or the side surface of the ceramic brick blank in the step C to form a strength enhancement glaze layer, wherein the bonding force of the strength enhancement glaze is more than or equal to 0.1 MPa;
E. and D, drying and firing the ceramic tile blank in the step D to form the glazed tile with enhanced strength.
Preferably, the difference between the melting temperature of the strength enhancing glaze and the melting temperature of the ceramic brick blank is less than or equal to 3 ℃, and the difference between the expansion coefficient of the strength enhancing glaze and the expansion coefficient of the ceramic brick blank is less than or equal to 3.
Preferably, in the step A, the strength enhancing glaze is sieved by a 325-mesh sieve, the screen residue is 1-2%, and the ball yield of the strength enhancing glaze is more than or equal to 1.88.
Preferably, step D further comprises the following steps:
d1, applying the strength enhancing glaze of the step A to the bottom surface of the ceramic brick blank of the step C by a spraying or roll coating glazing mode to form a bottom surface strength enhancing glaze layer;
d2, spreading the strength enhancing glaze of the step A on the side surface of the ceramic brick blank of the step D1 by a brushing glazing method to form a side surface strength enhancing glaze layer.
Preferably, when the bottom surface of the green brick is glazed by using a roller-coating glazing mode to form a bottom surface strength enhanced glaze layer, the glazing thickness is 1-1.4 mm;
when the bottom surface of the green brick is glazed by a spraying glazing method to form a bottom surface strength enhancing glaze layer, the glazing thickness is 0.18-0.35 mm;
when the side surface of the green brick is glazed by using a brushing glazing mode to form a side surface strength enhancing glaze layer, the glazing thickness is 0.02-0.05 mm.
Preferably, step D1 is preceded by step D0:
d0, adjusting the specific gravity of the strength enhancement glaze in the step A, wherein the specific gravity of the strength enhancement glaze for spraying is 1.35-1.40, the specific gravity of the strength enhancement glaze for roller coating is 1.60-1.80, and the specific gravity of the strength enhancement glaze for brush coating is 1.64-1.82.
The invention has the beneficial effects that: according to the technical scheme, the strength enhancing glaze is applied to the surface of the high-strength ceramic glazed tile, so that the surface of the finished glazed tile is consistent, and the strength of the glazed tile can be effectively improved. Further, the preparation method of the high-strength ceramic glazed tile is beneficial to preventing the falling of the strength enhancing glaze, ensures consistent hue and improved strength of the finished ceramic glazed tile, and has simple process and strong operability.
Drawings
The drawings are further illustrative of the invention and the content of the drawings does not constitute any limitation of the invention.
FIG. 1 is a partial cross-sectional view of a high strength ceramic glazed tile of the present invention.
Wherein: a strength enhancing glaze layer 1, a bottom surface strength enhancing glaze layer 11, a side surface strength enhancing glaze layer 12, a ceramic body layer 2 and a cover glaze layer 3.
Detailed Description
A high-strength ceramic glazed tile comprises a strength enhancing glaze layer 1, a ceramic body layer 2 and a surface glaze layer 3, wherein the strength enhancing glaze layer is positioned on the bottom surface of the ceramic body layer, and the surface glaze layer is positioned on the upper surface of the ceramic body layer;
the water absorption rate of the strength enhancing glaze layer 1 is less than that of the ceramic body layer, and the difference value between the water absorption rate of the strength enhancing glaze layer 1 and the water absorption rate of the ceramic body layer is less than or equal to 5%;
the raw materials of the strength enhancing glaze layer 1 at least comprise three frits, and the three frits have different expansion coefficients.
In order to solve the problem of inconsistent surface color of the glazed tile, the technical scheme is that the strength enhancing glaze layer 1 is distributed on the bottom surface of the ceramic body layer 2, and the luster transparency and the texture of the strength enhancing glaze layer 1 can be mutually supported with the glaze layer 3 in the glazed tile, so that the strength enhancing glaze layer and the glaze layer are naturally fused in the same glazed tile product.
Specifically, according to the technical scheme, the strength enhancement glaze layer is distributed on the bottom surface and/or the side surface of the green body, namely a piece of strength enhancement glaze clothes is worn on the bottom of the green body, the bottom of a brick blank lattice to which the strength enhancement glaze is applied is filled with the strength enhancement glaze, the bottom of the lattice is filled with the strength enhancement glaze with high density, the density difference between the bottom of the lattice and ribs is weakened, and the strength of the ceramic glazed tile can be effectively improved.
Specifically, in the technical scheme, the water absorption rate of the strength enhancing glaze layer 1 of the glazed tile is less than that of the ceramic body layer, the difference value between the water absorption rate of the strength enhancing glaze layer 1 and the water absorption rate of the ceramic body layer is controlled within 5%, the sintering degree refers to the sintering temperature, and refers to the temperature when the ceramic green body reaches the state of a solid aggregate through sintering, wherein the pore size is the smallest, the shrinkage is the largest, the product is the most compact, and the performance is the most excellent. The water absorption rate of the ceramic tile can be used for representing the sintering degree of the ceramic tile, and in order that the strength-enhanced glaze layer 1 in the glazed tile and the ceramic body layer 2 can be further mutually baked and supported and naturally fused in the same product, the technical scheme further limits the sintering degree of the glazed tile, is favorable for improving the bonding property of the strength-enhanced glaze layer 1 and the ceramic body layer 2 in the glazed tile and is also favorable for further improving the strength of the ceramic glazed tile.
In the technical scheme, the strength-enhanced glaze layer 1 for improving the strength of the glazed tile at least comprises three frits, and the three frits have different expansion coefficients.
The frit is added into the strength enhancing glaze, which is beneficial to improving the sintering degree of the glaze, so that the fire degree of the strength enhancing glaze is consistent with that of the blank, the strength enhancing glaze completely wets the bottom of the blank under the firing condition of the blank, the glaze is fine and compact, particles at the bottom of the blank can be effectively repaired through sliding, deforming or breaking of the blank bottom in the pressing and forming process of the blank, and micro cracks and micro gaps formed by rearrangement are completely filled and compact, so that the rough and uneven bottom of the blank can be improved, the combination between the blank glazes is promoted, and the anti-fracture capability and the anti-stretching capability of the bottom of the blank can be enhanced, and the strength of the ceramic tile can be improved. According to the technical scheme, three frits with different expansion coefficients are selected and added into the formula, so that the bonding property of the strength enhancing glaze and the ceramic body layer 2 is improved, and the strength of the ceramic glazed tile is further improved.
In other embodiments of this aspect, the ceramic glazed tile further comprises a ground coat layer and a decorative layer. The ground glaze layer is positioned between the ceramic body layer 2 and the surface glaze layer 3, and is beneficial to covering the body color of the ceramic body layer 2 and improving the bonding property between the ceramic body layer 2 and the surface glaze layer 3; the decorative layer is positioned on the upper surface of the overglaze layer 3 and plays a role of decoration.
Further, the strength enhancing glaze layer 1 comprises the following raw material components in parts by weight: 20-30 parts of first expansion frit, 40-50 parts of second expansion frit, 0-10 parts of third expansion frit, 2-8 parts of calcined talc, 4-10 parts of calcined clay, 5-11 parts of kaolin and 2-8 parts of potassium feldspar.
As is known, in the production process of ceramic tiles, the bottom of a blank body is not provided with a glaze layer, and in the invention, the reasonable selection of the raw materials of the strength-enhancing glaze not only is the basis for successful production of the ceramic tiles, but also is the basis for realizing improvement of the internal quality of the glazed tiles and promotion of the strength-enhancing glaze to form porcelain and sinter. Therefore, in order to ensure successful production and improvement of the inherent quality of the strength-enhancing glaze, the strength-enhancing glaze needs to be prepared from raw materials which have high initial melting temperature and wide melting temperature range and simultaneously have good adhesion and suspension properties.
The frit is beneficial to improving the sintering degree of the glaze, so that the fire degree of the strength enhancement glaze and the fire degree of the green body are kept consistent, when the addition amount of the frit in the strength enhancement glaze layer is too much, the fire degree of the strength enhancement glaze is obviously reduced, the glaze surface is easy to over-fire to generate pinholes, and the strength of the green body finished product is not obviously improved. When the addition amount of the frit in the strength-enhanced glaze layer is too small, the fire degree of the strength-enhanced glaze is higher, so that the porosity of the glaze layer is large, the density of the glaze surface is not enough, and the improvement of the strength of the finished glazed tile is not facilitated.
More specifically, the frits adopted in the technical scheme comprise a first expansion frit, a middle expansion frit and a third expansion frit, wherein the first expansion frit refers to a frit with an expansion coefficient of 130-170, the second expansion frit refers to a frit with an expansion coefficient of 160-210, and the third expansion frit refers to a frit with an expansion coefficient of 220-280. According to the technical scheme, three frits with different expansion coefficients are selected and added into the formula, so that the bonding property of the strength enhancing glaze and the ceramic body layer 2 is improved, and the strength of the ceramic glazed tile is further improved.
The calcined talc is a clinker which is calcined at high temperature before use, loses crystal water and organic matters, and basically has no ignition loss, so that the sintering shrinkage of the calcined talc is small, the components are basically unchanged before and after sintering, and the accurate size, flatness and no deformation of the product can be ensured. The calcined clay refers to calcined kaolin, which is obtained by calcining kaolin at high temperature and adding the calcined kaolin into a glaze formula, and is beneficial to improving the refractoriness of the strength-enhanced glaze; furthermore, as the burnt soil does not contain organic matters and crystal water, and does not generate thermal decomposition to release gas, the requirements of small expansion coefficient and stable linear increase of the expansion coefficient along with the rise of temperature can be simultaneously met, so that the firing shrinkage of the strength enhanced glaze can be ensured to be small, and the cracking of the strength enhanced glaze and the deformation of glazed tile products can be effectively prevented. Kaolin is an indispensable component in the glaze, and is added into the glaze, so that the suspension property and the adhesive force of the glaze are favorably met. The potassium feldspar widens the melting range of the strength enhancement glaze, increases the viscosity of the melt of the strength enhancement glaze, slowly reduces the viscosity of the melt of the strength enhancement glaze along with the increase of the temperature, is added to the strength enhancement glaze, is beneficial to widening the temperature tolerance of the strength enhancement glaze, and can inhibit and improve the condition of blank deformation caused by inconsistent shrinkage when a blank at a high temperature side and a blank at a low temperature side in a kiln are sintered due to large cross-section temperature difference in the kiln.
Further, the strength enhancing glaze layer 1 comprises the following raw material components in parts by weight: 25 parts of first expansion frit, 45 parts of second expansion frit, 5 parts of third expansion frit, 5 parts of calcined talc, 7 parts of calcined clay, 8 parts of kaolin and 5 parts of potash feldspar.
More specifically, the strength enhancing glaze layer is also arranged on the side surface of the ceramic body layer;
the strength-enhancing glaze layer 1 is divided into a bottom strength-enhancing glaze layer 11 and a side strength-enhancing glaze layer 12, the bottom strength-enhancing glaze layer 11 is located on the bottom surface of the green body layer 2, and the side strength-enhancing glaze layer 12 is located on the side surface of the green body layer 2.
Further, intensity reinforcing glaze layer 1 of this technical scheme includes bottom surface intensity reinforcing glaze layer 11 and side intensity reinforcing glaze layer 12, and bottom surface intensity reinforcing glaze layer 11 is located the bottom surface of body layer 2, and side intensity reinforcing glaze layer 12 is located the side of body layer 2, is favorable to making each face of glazed tile all the hue unanimous, promotes glazed tile's outward appearance effect more one by one.
Preferably, the thickness of the bottom strength enhancing glaze layer 11 is 0.1-0.3 mm. According to the technical scheme, the thickness of the bottom surface strength enhancing glaze layer 11 is limited to be 0.1-0.3 mm, when the bottom surface strength enhancing glaze layer 11 is too thin, the geometric shading at the bottom of the ceramic green brick body layer 2 cannot be completely filled, and the protective capability of the ceramic green brick body layer 2 is easily reduced; when the bottom strength enhancing glaze layer 11 is too thick, the normal paving of the ceramic tile is easily affected, which is not beneficial to ensuring the attractiveness of the paving of the ceramic tile.
Preferably, the thickness of the side strength enhancing glaze layer 12 is 0.02-0.05 mm. According to the technical scheme, the thickness of the side strength enhancing glaze layer 12 is limited to be 0.02-0.05 mm, when the side strength enhancing glaze layer 12 is too thin, the side strength enhancing glaze layer 12 cannot completely cover the color phase of the side surface of the ceramic tile body layer 2, so that the difference between the performance indexes of the side surface of the ceramic tile body layer 2, such as whiteness, glossiness and transmittance, and the performance indexes of the surface glaze layer 3, such as whiteness, glossiness and transmittance, is not easy to overcome, the consistency of the color phase of finished glazed tiles is not easy to ensure, when the side strength enhancing glaze layer 12 is too thick, the normal paving and pasting of the tiles are easily influenced, and the attractiveness of the paving and pasting of the tiles is not easy to ensure.
A preparation method of the high-strength ceramic glazed tile comprises the following steps:
A. adding the raw material of the strength enhancing glaze into a ball mill according to the proportion to prepare the strength enhancing glaze;
B. adding the overglaze raw materials into a ball mill according to the proportion, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain overglaze;
C. b, applying the overglaze cloth in the step B on the upper surface of the ceramic brick blank to form an overglaze layer 3;
D. b, applying the strength enhancement glaze cloth in the step A to the bottom surface and/or the side surface of the ceramic brick blank in the step C to form a strength enhancement glaze layer 1, wherein the bonding force of the strength enhancement glaze is more than or equal to 0.1 MPa;
E. and D, drying and firing the ceramic tile blank in the step D to form the glazed tile with enhanced strength.
Furthermore, the technical scheme also provides a preparation method of the high-strength ceramic glazed tile, wherein the bonding force of the strength enhancing glaze is controlled to be more than or equal to 0.1MPa, so that the strength enhancing glaze is prevented from falling off from the bottom or the side wall of a ceramic tile blank, the color phase consistency of the finished ceramic tile is ensured, the deformation degree of the finished ceramic tile is reduced, and the preparation method is simple in process and high in operability.
The specific steps of step a may include any one of the following two types:
(1) a, adding the raw material of the strength enhancement glaze into a ball mill according to a ratio, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain the strength enhancement glaze;
the strength enhancement glaze raw material, the grinding balls and the water are added in a mass ratio of 1:2 (1-0.8). The strength-enhancing glaze raw material is 1 part by weight, the addition amount of the sodium carboxymethyl cellulose is 0.15-0.25 part by weight, and the addition amount of the sodium tripolyphosphate is 0.2-0.35 part by weight.
(2) A, weighing raw materials of the strength-enhanced glaze according to a ratio to form a mixture, and then adding the mixture into a ball mill for dry ball milling; finally, mixing and stirring the mixture and the organic solvent according to the proportion to form the strength enhancing glaze; when the strength-enhancing glaze is prepared by using an organic solvent, it can provide better adhesion and prevent the strength-enhancing glaze from falling off before the tile is fired in a kiln.
In one embodiment of the technical scheme, the organic solvent comprises ethylene glycol, glycerol, polyether polyol, acrylic acid and acrylamide, and the addition ratio of the mixture, the ethylene glycol, the glycerol, the polyether polyol, the acrylic acid and the acrylamide is (7-30): (40-50): (20-30): (15-25): (5-10): (5-10).
It should be noted that the ceramic adobe and the overglaze can be made by the existing formula.
Further, the difference between the melting temperature of the strength enhancing glaze and the melting temperature of the ceramic brick blank body is less than or equal to 3 ℃, and the difference between the expansion coefficient of the strength enhancing glaze and the expansion coefficient of the ceramic brick blank body is less than or equal to 3.
In the prior art, the melting temperature of the overglaze of the glazed tile is generally 50-130 ℃ lower than that of the blank body, so that the overglaze is covered on the surface of the blank body in a molten glass shape under the action of high temperature and is smoothly spread to form an overglaze layer. When firing, if the overglaze is applied to the bottom of the blank, the overglaze is likely to fall off from the bottom of the blank during firing due to the large difference between the melting temperatures of the overglaze and the blank.
Therefore, in order to ensure that the strength enhancing glaze distributed at the bottom of the green body layer of the glazed tile is not easy to fall off in the firing process and prevent the green tile from deforming, the technical scheme limits the melting temperature and the expansion coefficient of the strength enhancing glaze, respectively, the difference between the melting temperature of the strength enhancing glaze and the melting temperature of the ceramic green tile is less than or equal to 3 ℃, and the difference between the expansion coefficient of the strength enhancing glaze and the expansion coefficient of the ceramic green tile is less than or equal to 3. The melting temperature of the strength-enhancing glaze refers to the highest melting temperature of the strength-enhancing glaze, the melting temperature of the greenware is the highest temperature of the kiln when the greenware is fired, and the expansion coefficient specifically refers to the expansion coefficient from room temperature to 400 ℃ or from room temperature to 600 ℃.
Further, in the step A, the strength enhancing glaze is sieved by a 325-mesh sieve, the screen residue is 1-2%, and the ball yield of the strength enhancing glaze is more than or equal to 1.88.
When the fineness of the strength-enhancing glaze is finer, the suspension property and the fluidity are better, but if the fineness of the strength-enhancing glaze is too coarse, the glaze surface of the strength-enhancing glaze after firing is rough. Furthermore, the technical scheme limits the ball-out specific gravity of the strength enhanced glaze to be more than or equal to 1.88, and facilitates on-site glaze adjustment.
More specifically, step D further includes the following steps:
d1, applying the strength enhancing glaze of the step A to the bottom surface of the ceramic brick blank of the step C by a spraying or roll coating glazing mode to form a bottom surface strength enhancing glaze layer 11;
d2, spreading the strength enhancing glaze of the step A on the side surface of the ceramic brick blank of the step D1 by a brushing glazing method to form a side surface strength enhancing glaze layer 12.
The strength enhancing glaze layer positioned on the bottom surface is applied by a spraying or rolling glazing mode, so that the strength enhancing glaze layer with a certain thickness is formed at the bottom of the body layer, and the function of the strength enhancing glaze layer can be effectively realized.
The strength enhancing glaze layer on the side surface is applied in a brushing glazing mode, so that the strength enhancing glaze layer with a thin wall is formed on the side part of the body layer, the function of the strength enhancing glaze layer is realized, and the influence of the side surface strength enhancing glaze layer on the paving of the glazed tile is effectively avoided.
Further, in an embodiment of the present technical solution, the glazed tile axis application sequence is:
firstly, coating surface glaze on the upper surface of a ceramic brick blank;
then spraying strength enhancing glaze on the bottom surface of the ceramic brick blank;
and finally, arranging brushing shafts on the two advancing sides of the ceramic green body, brushing the coating shafts with the strength enhancing glaze, enabling the left side and the right side of the ceramic green body to touch the brushing shafts in the advancing process to finish glazing, clamping the two side surfaces of the ceramic green body without the coating shafts, rotating the two side surfaces by 90 degrees, and feeding the ceramic green body into a kiln after glazing of the front side surface and the rear side surface is finished.
It should be noted that, because the difference between the melting temperature of the strength enhancing glaze and the melting temperature of the ceramic tile blank 2 is less than or equal to 3 ℃, and the difference between the expansion coefficient of the strength enhancing glaze and the expansion coefficient of the ceramic tile blank 2 is less than or equal to 3, the strength enhancing glaze cannot be separated from the bottom of the ceramic tile blank in the process of firing the glazed tile.
Further, since the strength enhancing glaze in the present technical solution is in direct contact with the roll bar in the kiln, the strength enhancing glaze inevitably sticks to the roll bar, but only a small amount of the strength enhancing glaze sticks to the roll bar, and since the strength enhancing glaze of the present technical solution does not carry a decoration function, the effect can be ignored.
Preferably, the technical scheme can also apply back primer on the bottom surface of the bottom surface strength enhancing glaze layer 11, and the back primer is favorable for preventing the strength enhancing glaze positioned on the bottom surface from being stuck on the roller rod of the kiln.
Furthermore, when the bottom surface of the green brick is glazed by using a roller-coating glazing method to form a bottom surface strength enhanced glaze layer 11, the glazing thickness is 1-1.4 mm;
when the bottom surface of the green brick is glazed by a spraying glazing mode to form a bottom surface strength enhanced glaze layer 11, the glazing thickness is 0.18-0.35 mm;
when the side surface strength enhanced glaze layer 12 is formed by glazing the side surface of the green brick by using a brushing glazing mode, the glazing thickness is 0.02-0.05 mm.
To be more specific, step D1 is preceded by step D0:
d0, adjusting the specific gravity of the strength enhancement glaze in the step A, wherein the specific gravity of the strength enhancement glaze for spraying is 1.35-1.40, the specific gravity of the strength enhancement glaze for roller coating is 1.60-1.80, and the specific gravity of the strength enhancement glaze for brush coating is 1.64-1.82.
The specific gravity of the strength enhancing glaze is adjusted according to different glazing modes, so that the glazing effectiveness of the strength enhancing glaze is guaranteed, and the strength enhancing glaze is protected against green bricks.
The spraying glazing is to spray glaze slurry into mist with compressed air and blow the mist onto green brick, so that the glaze is adhered to the green brick. The spraying glazing requires the glaze slip to have large water content and small concentration, so the specific gravity is between 1.35 and 1.40. The spraying specific gravity is more than 1.40, the spray gun is easy to block by the glaze slurry, the spraying specific gravity is less than 1.35, and the quantity of the glaze slurry sprayed to the green brick is too small and too thin.
The roller-coating glazing is that a cylindrical rubber roller is arranged above a glaze groove, the glaze groove is filled with strength enhancing glaze slurry, the glaze groove is relatively vertical to a glazing line, the glaze groove is arranged below the glazing line, when a brick blank moves forwards on the glazing line, the rubber roller on the glaze groove starts to rotate, and the strength enhancing glaze slurry adhered on the rubber roller is distributed at the bottom of the brick blank along with the rotation of the rubber roller and the forward movement of the brick blank.
When the intensity-enhanced glaze is coated on the rubber roller, the specific gravity is less than 1.60, the concentration of the glaze slip is low, the adhesion force of the glaze slip and the rubber roller is low, the glaze slip adhered on the rubber roller is less, the intensity-enhanced glaze coated on the green brick is less, the thickness is thinner, and the bottom of the green brick cannot be well filled. When the intensity-enhanced glaze is coated on the rubber roller, the specific gravity is more than 1.80, the glaze slip concentration is high, the adhesion force of the glaze slip and the rubber roller is high, the glaze slip is adhered on the rubber roller, the intensity-enhanced glaze coated on the green brick is high, the thickness is thicker, and the bottom glaze of the green brick is too much.
Because the glazing part is arranged on the side surface of the blank body, the glazing mode of brushing the side surface of the blank body is mostly manual glazing, and the specific gravity of the strength enhancement glaze for brushing is limited to 1.64-1.82 in the technical scheme. When the specific gravity of the strength-enhanced glaze is less than 1.64, the glaze slurry has large water content, the side surface water absorption area of the blank body is small, the surface drying rate after glazing is slow, and the method is not suitable for the operation of subsequent procedures; when the specific gravity of the strength-enhanced glaze is more than 1.82, the concentration of the glaze slip is high, the continuous brushing operation of the side surface of the blank body is inconvenient, and the brushing of the glaze layer on the side surface is not uniform.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example group 1-a method for preparing a high strength ceramic glazed tile, comprising the steps of:
A. adding the raw materials of the strength-enhanced glaze with the proportion of the following table 1 into a ball mill, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill for ball milling to obtain the strength-enhanced glaze;
B. adding the overglaze raw material into a ball mill according to the proportion, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain overglaze, wherein the overglaze is prepared from a conventional overglaze formula of the glazed tile;
C. b, applying the overglaze cloth in the step B on the upper surface of the ceramic brick blank to form an overglaze layer;
d1, applying the strength enhancing glaze of the step A to the bottom surface of the ceramic brick blank of the step C by a roll coating glazing mode to form a bottom surface strength enhancing glaze layer, wherein the glazing thickness of the bottom surface strength enhancing glaze layer is 1.2 mm;
d2, applying the strength enhancing glaze of the step A to the side surface of the ceramic brick blank of the step D1 by a brushing glazing mode to form a side strength enhancing glaze layer, wherein the glazing thickness of the side strength enhancing glaze layer is 0.03 mm;
wherein the ceramic brick body is prepared by a conventional ceramic brick body formula, the binding power of the strength enhancing glaze is 0.1MPa, the difference between the melting temperature of the strength enhancing glaze and the melting temperature of the ceramic brick body is 3 ℃, and the difference between the expansion coefficient of the strength enhancing glaze and the expansion coefficient of the ceramic brick body is 3;
E. and D2, drying and firing the ceramic tile blank to form the glazed tile.
Table 1 example raw material composition of strength enhancing glaze in group 1
The method comprises the following steps of respectively preparing glazed tiles by adopting the strength enhancing glaze of different raw material components in the upper table, observing the glaze surface of the strength enhancing glaze layer, and carrying out whiteness test, glossiness test and strength test on the obtained glazed tiles according to a detection method of national standard, wherein the results are shown in table 2:
table 2 results of performance tests of various glazed tiles in example group 1
The test result of the embodiment group 1 shows that the whiteness of the strength enhancing glaze in different glazed tiles in the embodiment group 1 is more than 50 degrees, the glossiness of the strength enhancing glaze is less than 40, and the strength enhancing glaze has certain whiteness and glossiness.
Comparative example group 1-a method for preparing a ceramic glazed tile, comprising the steps of:
A. adding the raw materials of the strength-enhancing glaze with the proportion of the following table 3 into a ball mill, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill for ball milling to obtain the strength-enhancing glaze;
B. adding the overglaze raw material into a ball mill according to the proportion, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain overglaze, wherein the overglaze is prepared from a conventional overglaze formula of the glazed tile;
C. b, applying the overglaze cloth in the step B on the upper surface of the ceramic brick blank to form an overglaze layer;
d1, applying the strength enhancing glaze of the step A to the bottom surface of the ceramic brick blank of the step C by a roll coating glazing mode to form a bottom surface strength enhancing glaze layer, wherein the glazing thickness of the bottom surface strength enhancing glaze layer is 1.2 mm;
d2, applying the strength enhancing glaze of the step A to the side surface of the ceramic brick blank of the step D1 by a brushing glazing mode to form a side strength enhancing glaze layer, wherein the glazing thickness of the side strength enhancing glaze layer is 0.03 mm;
wherein the ceramic brick body is prepared by a conventional ceramic brick body formula, the binding power of the strength enhancing glaze is 0.1MPa, the difference between the melting temperature of the strength enhancing glaze and the melting temperature of the ceramic brick body is 3 ℃, and the difference between the expansion coefficient of the strength enhancing glaze and the expansion coefficient of the ceramic brick body is 3;
E. and D2, drying and firing the ceramic tile blank to form the glazed tile.
Table 3 raw material composition of strength enhancing glaze in comparative example group 1
The glazed tile is prepared by respectively adopting the strength enhancing glaze of different raw material components in the upper table, the glaze of the strength enhancing glaze layer is observed, and the obtained glazed tile is subjected to whiteness test, glossiness test and strength test according to the detection method of the national standard, and the results are shown in table 4:
table 4 results of performance test of various glazed tiles in comparative example group 1
The test results of the embodiment 1-1 and the comparative embodiments 1-1 and 1-3 show that when the addition amount of the frit in the strength-enhancing glaze layer is too small, the fire of the strength-enhancing glaze is higher, so that the porosity of the glaze layer is large, the density of the glaze layer is not enough, and the improvement of the strength of the finished glazed tile is not facilitated.
The test results of the examples 1 to 3 and the comparative examples 1 to 2, 1 to 4 and 1 to 5 show that the frits are beneficial to improving the sintering degree of the glaze material, so that the fire degree of the strength enhancing glaze and the fire degree of the green body are kept consistent, when the addition amount of the frits in the strength enhancing glaze layer is too much, the fire degree of the strength enhancing glaze is obviously reduced, the glaze surface is easy to over-fire, pinholes appear, and the strength of the finished brick blank is not obviously improved.
Comparative example group 2-a method for preparing a ceramic glazed tile, comprising the steps of:
A. adding the raw materials of the strength-enhancing glaze with the mixture ratio shown in the following table 5 into a ball mill, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain the strength-enhancing glaze;
B. adding the overglaze raw material into a ball mill according to the proportion, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain overglaze, wherein the overglaze is prepared from a conventional overglaze formula of the glazed tile;
C. b, applying the overglaze cloth in the step B on the upper surface of the ceramic brick blank to form an overglaze layer;
d1, applying the strength enhancing glaze of the step A to the bottom surface of the ceramic brick blank of the step C by a roll coating glazing mode to form a bottom surface strength enhancing glaze layer, wherein the glazing thickness of the bottom surface strength enhancing glaze layer is 1.2 mm;
d2, applying the strength enhancing glaze of the step A to the side surface of the ceramic brick blank of the step D1 by a brushing glazing mode to form a side strength enhancing glaze layer, wherein the glazing thickness of the side strength enhancing glaze layer is 0.03 mm;
wherein the ceramic brick body is prepared by a conventional ceramic brick body formula, the binding power of the strength enhancing glaze is 0.1MPa, the difference between the melting temperature of the strength enhancing glaze and the melting temperature of the ceramic brick body is 3 ℃, and the difference between the expansion coefficient of the strength enhancing glaze and the expansion coefficient of the ceramic brick body is 3;
E. and D2, drying and firing the ceramic tile blank to form the glazed tile.
TABLE 5 raw material composition of strength-enhancing glaze in comparative example group 2
The glazed tile is prepared by respectively adopting the strength enhancing glaze of different raw material components in the upper table, the glaze of the strength enhancing glaze layer is observed, and the obtained glazed tile is subjected to whiteness test, glossiness test and strength test according to the detection method of the national standard, and the results are shown in table 6:
table 6 results of performance test of various glazed tiles in comparative example group 2
The test results of the examples 1-2 and the comparative example group 2 show that the technical scheme selects three titanium frits with different expansion coefficients to be added into the formula, so that the bonding property of the strength enhanced glaze and the ceramic body layer 2 is improved, and the strength of the ceramic glazed tile is further improved.
Example group 2-method for preparing ceramic strength-enhanced glazed tile
According to the same preparation method and conditions as in examples 1-2, only the magnitude of the adhesion of the strength-enhancing glaze was adjusted as shown in the following examples:
example 2-1: the bonding force of the strength enhancing glaze is 0.01 MPa;
example 2-2: the bonding force of the strength enhancing glaze is 0.05 MPa;
examples 2 to 3: the bonding force of the strength enhancing glaze is 0.15 MPa;
examples 2 to 4: the bonding force of the strength enhancing glaze is 0.2 MPa;
the above strength-enhancing glaze was used to prepare a glazed tile according to the preparation method in example 1-2, the glaze of the strength-enhancing glaze layer was observed, and the obtained glazed tile was subjected to whiteness test, glossiness test and strength test according to the detection method of the national standard, and the results are shown in the following table:
table 7 results of performance tests on various glazed tiles in example group 2
As can be seen from the performance test results of the examples 1-3 and the examples 2-1 and 2-2, if the bonding force of the strength-enhancing glaze in the technical scheme is small, the strength-enhancing glaze is easy to fall off from the bottom or the side wall of the ceramic brick blank, so that the color consistency of the finished ceramic brick product cannot be ensured, and the effect of high strength cannot be achieved.
The performance test results of the examples 1 to 3 and the examples 2 to 3 and 2 to 4 show that the control of the bonding force of the strength enhancing glaze to be more than or equal to 0.1MPa is beneficial to preventing the strength enhancing glaze from falling off from the bottom of a ceramic brick blank, ensuring the consistent color phase of a ceramic tile finished product and effectively improving the strength of the glazed tile finished product.
EXAMPLE 3 preparation of high-Strength ceramic glazed Tile
According to the same preparation method and conditions as in examples 1-3, only the thickness of the enamel layer for strength enhancement was varied, as shown in the following examples:
example 3-1:
the glazing thickness of the bottom surface strength enhancing glaze layer is 0.5 mm;
the glazing thickness of the side strength enhancement glaze layer is 0.1 mm;
example 3-2:
the glazing thickness of the bottom surface strength enhancing glaze layer is 1 mm;
the glazing thickness of the side strength enhancement glaze layer is 0.18 mm;
examples 3 to 3:
the glazing thickness of the bottom surface strength enhancing glaze layer is 1.4 mm;
the glazing thickness of the side strength enhancement glaze layer is 0.35 mm;
examples 3 to 4:
the glazing thickness of the bottom surface strength enhancing glaze layer is 2 mm;
the glazing thickness of the side strength enhancement glaze layer is 0.5 mm;
the above-mentioned strength-enhancing glaze layer with the glazed thickness was used to prepare a glazed tile according to the preparation method in examples 1 to 3, the glaze of the strength-enhancing glaze layer was observed, and the obtained glazed tile was subjected to whiteness test, glossiness test and strength test according to the detection method of the national standard, and the results are shown in the following table:
table 8 results of performance test of various glazed tiles in example group 3
As can be seen from the performance test results of the embodiments 1 to 3 and the embodiment group 4, the technical scheme is used for the glazing thickness of the strength enhancing glaze, so that the phenomenon of glaze shortage of a brick body is avoided, the smoothness of the glaze surface of the strength enhancing glaze layer can be effectively ensured, and the fluctuation of the glaze surface is prevented.
EXAMPLE 4 preparation of high-Strength ceramic glazed Tile
According to the same preparation method and conditions as in examples 1 to 3, only the specific gravity of the strength-enhancing glaze was changed as shown in the following examples:
example 4-1:
the specific gravity of the strength enhancing glaze for roller coating is 1.5;
the specific gravity of the strength enhancement glaze for brushing is 1.55;
example 4-2:
the specific gravity of the strength enhancing glaze for roller coating is 1.6;
the specific gravity of the strength enhancement glaze for brushing is 1.64;
examples 4 to 3:
the specific gravity of the strength enhancing glaze for roller coating is 1.8;
the specific gravity of the strength enhancement glaze for brushing is 1.82;
examples 4 to 4:
the specific gravity of the strength enhancing glaze for roller coating is 1.9;
the specific gravity of the strength enhancement glaze for brushing is 1.91;
the above strength-enhancing glaze was used to prepare glazed tiles according to the preparation method in examples 1 to 3, the glaze of the strength-enhancing glaze layer was observed, and the obtained glazed tiles were subjected to whiteness test, glossiness test and strength test according to the detection method of the national standard, and the results are shown in the following table:
table 9 results of performance test of various glazed tiles in example group 4
From the performance test results of the examples 1 to 3 and the example group 4, it can be seen that when the specific gravity of the strength enhancing glaze coated on the green brick is low, the thickness of the anti-shape glaze glazing glaze layer formed by the strength enhancing glaze layer is too thin to well fill the bottom of the green brick, and the strength of the ceramic tile is not improved due to the glaze shortage phenomenon. When the specific gravity of the strength enhancing glaze is too large, the concentration of the glaze slip is large, the strength enhancing glaze coated on the green brick becomes more, the thickness of the formed anti-shape glaze glazing glaze layer is thicker, the bottom glaze of the green brick is too much, and the later-period paving and pasting of the ceramic tile are not facilitated.
Comparative example 3-a method for preparing a ceramic glazed tile, comprising the steps of:
A. adding the overglaze raw material into a ball mill according to the proportion, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain overglaze, wherein the overglaze is prepared from a conventional overglaze formula of the glazed tile;
B. b, applying the overglaze cloth in the step A on the upper surface of the ceramic brick blank to form an overglaze layer;
C. and D, drying and firing the ceramic brick blank body obtained in the step B to form the glazed brick.
The exterior of the glazed tile was observed, and the obtained glazed tile was subjected to whiteness test, glossiness test and flatness test according to the national standard test method, and the results are shown in the following table 10:
TABLE 10 comparison of Performance test results of comparative example 3 and example set 1
The result of the comparison test between the general glazed tile and the glazed tile with the strength enhancing glaze layer in the technical scheme shows that the color tone of the top surface of the glazed tile is consistent with the color tone of the side surface and/or the bottom surface of the glazed tile. In addition, the technical scheme also endows the glazed tile with high strength, can effectively improve the breaking strength and the modulus of rupture of the glazed tile product, is favorable for meeting the performance requirements of more customers and improves the applicability of the strength enhancing glaze.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A high strength pottery glazed tile which characterized in that: the ceramic body comprises a strength enhancing glaze layer, a ceramic body layer and a surface glaze layer, wherein the strength enhancing glaze layer is positioned on the bottom surface of the ceramic body layer, and the surface glaze layer is positioned on the upper surface of the ceramic body layer;
the water absorption rate of the strength enhancing glaze layer is less than that of the ceramic body layer, and the difference value between the water absorption rate of the strength enhancing glaze layer and the water absorption rate of the ceramic body layer is less than or equal to 5%;
the raw materials of the strength enhancing glaze layer at least comprise three frits, and the three frits have different expansion coefficients.
2. A high strength ceramic glazed tile as claimed in claim 1, wherein: the strength-enhanced glaze layer comprises the following raw material components in parts by weight: 20-30 parts of first expansion frit, 40-50 parts of second expansion frit, 0-10 parts of third expansion frit, 2-8 parts of calcined talc, 4-10 parts of calcined clay, 5-11 parts of kaolin and 2-8 parts of potassium feldspar.
3. A high strength ceramic glazed tile as claimed in claim 2, wherein: the strength-enhanced glaze layer comprises the following raw material components in parts by weight: 25 parts of first expansion frit, 45 parts of second expansion frit, 5 parts of third expansion frit, 5 parts of calcined talc, 7 parts of calcined clay, 8 parts of kaolin and 5 parts of potash feldspar.
4. A high strength ceramic glazed tile as claimed in claim 1, wherein: the strength enhancing glaze layer is also arranged on the side surface of the ceramic body layer;
the strength enhancing glaze layer is divided into a bottom strength enhancing glaze layer and a side strength enhancing glaze layer, the bottom strength enhancing glaze layer is positioned on the bottom surface of the body layer, and the side strength enhancing glaze layer is positioned on the side surface of the body layer.
5. A preparation method of the high-strength ceramic glazed tile as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
A. adding the raw material of the strength enhancing glaze into a ball mill according to the proportion to prepare the strength enhancing glaze;
B. adding the overglaze raw materials into a ball mill according to the proportion, mixing sodium carboxymethylcellulose, sodium tripolyphosphate and water into the ball mill, and carrying out ball milling to obtain overglaze;
C. b, applying the overglaze cloth in the step B on the upper surface of the ceramic brick blank to form an overglaze layer;
D. b, applying the strength enhancement glaze cloth in the step A to the bottom surface and/or the side surface of the ceramic brick blank in the step C to form a strength enhancement glaze layer, wherein the bonding force of the strength enhancement glaze is more than or equal to 0.1 MPa;
E. and D, drying and firing the ceramic tile blank in the step D to form the glazed tile with enhanced strength.
6. The method for preparing a high-strength ceramic glazed tile according to claim 5, wherein the method comprises the following steps: the difference between the melting temperature of the strength enhancing glaze and the melting temperature of the ceramic brick blank is less than or equal to 3 ℃, and the difference between the expansion coefficient of the strength enhancing glaze and the expansion coefficient of the ceramic brick blank is less than or equal to 3.
7. The method for preparing a high-strength ceramic glazed tile according to claim 5, wherein the method comprises the following steps: in the step A, the strength enhancement glaze is sieved by a 325-mesh sieve, the screen residue is 1-2%, and the ball yield of the strength enhancement glaze is more than or equal to 1.88.
8. The method for preparing a high-strength ceramic glazed tile according to claim 7, wherein the method comprises the following steps: the step D also comprises the following steps:
d1, applying the strength enhancing glaze of the step A to the bottom surface of the ceramic brick blank of the step C by a spraying or roll coating glazing mode to form a bottom surface strength enhancing glaze layer;
d2, spreading the strength enhancing glaze of the step A on the side surface of the ceramic brick blank of the step D1 by a brushing glazing method to form a side surface strength enhancing glaze layer.
9. The method for preparing a high-strength ceramic glazed tile according to claim 8, wherein the method comprises the following steps:
when a bottom surface strength enhanced glaze layer is formed by glazing the bottom surface of the green brick in a roller-coating glazing mode, the glazing thickness is 1-1.4 mm;
when the bottom surface of the green brick is glazed by a spraying glazing method to form a bottom surface strength enhancing glaze layer, the glazing thickness is 0.18-0.35 mm;
when the side surface of the green brick is glazed by using a brushing glazing mode to form a side surface strength enhancing glaze layer, the glazing thickness is 0.02-0.05 mm.
10. The method for preparing a high-strength ceramic glazed tile according to claim 8, wherein the method comprises the following steps: step D1 is preceded by step D0:
d0, adjusting the specific gravity of the strength enhancement glaze in the step A, wherein the specific gravity of the strength enhancement glaze for spraying is 1.35-1.40, the specific gravity of the strength enhancement glaze for roller coating is 1.60-1.80, and the specific gravity of the strength enhancement glaze for brush coating is 1.64-1.82.
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