Ceramic product with iridescent glaze effect and preparation method thereof

Abstract

The invention discloses a ceramic product with an iridescent glaze effect and a preparation method thereof. The preparation method comprises the following steps: applying a base glaze on the surface of a body; applying an iridescent glaze on the surface of the body after the base glaze is applied; the raw material composition of the base glaze of the iridescent glaze comprises: by mass percentage, 15-25% of labradorite dry particles, 15-25% of transparent dry particles and 40-60% of a suspending agent; applying a full-polished glaze on the surface of the body after the iridescent glaze is applied; firing and polishing the body after the full-polished glaze is applied to obtain a ceramic product with an iridescent glaze effect. The method uses an iridescent glaze composed of transparent dry particles and labradorite dry particles as main raw materials, avoids the labradorite dry particles from being decomposed and melted during the firing process, and retains them in the form of particles, presenting a natural three-dimensional effect. At the same time, due to the crystal phase structure characteristics of the labradorite dry particles, the product surface has a strong iridescent effect.

Description

Technical Field

[0001] The invention belongs to the field of building ceramics, and in particular relates to a ceramic product with iridescent glaze effect and a preparation method thereof. Background Art

[0002] Most rocks in nature have a semi-crystalline structure, usually composed of crystalline substances and glass phases. The crystalline substances are set off against the glass phase due to their size, shape, color, gloss and other characteristics, presenting a colorful three-dimensional glossy effect. At present, the architectural ceramics industry mainly prepares ceramic products with color flash three-dimensional effects by introducing decorative materials into the polished glaze. For example, high-temperature frits, flash frits, colored frits, etc. are introduced into the polished glaze. Of course, there are also studies that propose to introduce zircon or zirconium silicate into the polished glaze to form a flash effect through the difference in refractive index between it and the glass phase of the polished glaze. For ceramic products with iridescent glaze, the current mainstream process is to form metal glaze with metal and metal oxide as raw materials. After the metal glaze is applied to the brick surface, a crystallization film is formed on the surface of the product after firing. The crystallization film forms an iridescent effect under the action of light. However, the production stability of metal glaze is poor, the cost is high, and the iridescence effect is relatively poor. Summary of the invention

[0003] In view of the above problems, the technical purpose of the present invention is to provide a ceramic product with an iridescent glaze effect and a preparation method thereof. The method uses an iridescent glaze composed of transparent dry particles and labradorite dry particles as main raw materials, tries to avoid the decomposition and melting of the labradorite dry particles during the firing process, and retains them in the form of particles, and then applies a full polishing glaze layer on the surface of the iridescent glaze to fill the gaps between the dry particles and improve the flatness of the glaze after polishing. Since the labradorite dry particles are randomly and naturally distributed in the glaze layer, a natural three-dimensional effect is presented. At the same time, due to the crystal phase structure characteristics of the labradorite dry particles, the product surface has a strong iridescent effect.

[0004] In a first aspect, the present invention provides a method for preparing a ceramic product with an iridescent glaze effect, comprising the following steps:

[0005] Applying base glaze on the surface of the body;

[0006] Applying iridescent glaze on the surface of the body after applying the base glaze; the raw material composition of the base glaze of the iridescent glaze includes: by mass percentage, 15-25% of labradorite dry particles, 15-25% of transparent dry particles and 40-60% of suspending agent;

[0007] Apply full glaze on the surface of the body after applying the iridescent glaze;

[0008] The fully glazed body is fired and polished to obtain a ceramic product with an iridescent glaze effect.

[0009] Preferably, the chemical composition of the labradorite dry particles includes, by mass percentage, SiO2: 61-63%, Al2O3: 22-25%, K2O: 1-3%, Na2O: 5-10%, and CaO: 5-10%.

[0010] Preferably, the particle gradation of the labradorite dry particles includes: in terms of mass percentage, 10-20% below 60 mesh, 50-70% between 60 and 80 mesh, and 20-30% above 80 mesh.

[0011] Preferably, the chemical composition of the transparent dry particles includes, by mass percentage, SiO2: 59-61%, Al2O3: 11-16%, CaO: 10-12%, MgO: 1-2.5%, K2O: 5-6.5%, Na2O: 1.5-1.7%, BaO: 0.4-1.5%, and ZnO: 5-5.5%.

[0012] Preferably, the particle grading of the transparent dry particles includes: in terms of mass percentage, 0-5% below 80 mesh, 20-30% between 80 and 100 mesh, 30-50% between 100 and 200 mesh, 20-40% between 200 and 325 mesh, and 5-10% above 325 mesh.

[0013] Preferably, the iridescent glaze is applied by pouring glaze; the specific gravity of the iridescent glaze is 1.5-1.6 g / cm 3 , glaze application amount is 900~1200g / m 2 .

[0014] Preferably, the chemical composition of the base glaze of the base glaze includes: in terms of mass percentage, loss on ignition: 3-4%, SiO2: 52-59%, Al2O3: 20-26%, CaO: 0.1-0.3%, MgO: 0.1-0.3%, K2O: 4-5%, Na2O: 1.8-3.2%, ZrO2: 5-7%; preferably, the base glaze is applied by spraying; the specific gravity of the base glaze is 1.4-1.55 g / cm 3 , glaze application amount is 500~600g / m 2 .

[0015] Preferably, the chemical composition of the full-polished glaze includes: by mass percentage, SiO2: 59-61%, Al2O3: 11-16%, CaO: 10-12%, MgO: 1-2.5%, K2O: 5-6.5%, Na2O: 1.5-1.7%, ZnO: 5-5.5%, BaO: 0.1-2%; the full-polished glaze is applied by pouring glaze; the specific gravity of the full-polished glaze is 1.5-1.6g / cm 3 , glaze application amount is 800~1100g / m 2 .

[0016] Preferably, the maximum firing temperature is 1170-1220° C., and the firing period is 65-80 minutes.

[0017] In a second aspect, the present invention provides a ceramic product with an iridescent glaze effect obtained by any one of the preparation methods described. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the XRD pattern of dry particles of labradorite.

[0019] Figure 2 It is the brick surface effect diagram of Examples 1 to 3.

[0020] Figure 3 This is a brick surface effect diagram of Example 4 using dry labradorite particles with different particle gradations.

[0021] Figure 4 This is a brick surface effect diagram of Example 5 using different contents of labradorite dry particles and transparent dry particles. DETAILED DESCRIPTION

[0022] The present invention is further described by the following embodiments. It should be understood that the following embodiments are only used to illustrate the present invention, but not to limit the present invention. Unless otherwise specified, each percentage refers to the percentage by weight. The following is an exemplary description of the preparation method of the ceramic product with iridescent glaze effect of the present invention.

[0023] Prepare a green body. Press the green body powder into a shape to obtain a green body. The chemical composition and raw material composition of the green body powder are not limited, and the green body powder commonly used in the art can be used. As an example, the chemical composition of the green body powder includes: in terms of mass percentage, ignition loss: 3-4%, SiO2: 62-67%, Al2O3: 20-25%, Fe2O3: 0.5-1.5%, K2O: 1-3%, Na2O: 1-3%.

[0024] Apply base glaze on the surface of the dried body. The function of base glaze is to cover the base color and defects of the body and promote the color development of the inkjet pattern.

[0025] The base glaze formula commonly used in the art can be used. In some embodiments, the chemical composition of the base glaze of the base glaze includes: in terms of mass percentage, loss on ignition: 3-4%, SiO2: 52-59%, Al2O3: 20-26%, CaO: 0.1-0.3%, MgO: 0.1-0.3%, K2O: 4-5%, Na2O: 1.8-3.2%, ZrO2: 5-7%. Fe2O3 and ZnO can also be introduced into the chemical composition of the base glaze of the base glaze. The mass percentage of the Fe2O3 and ZnO are both controlled to be less than 0.1%.

[0026] In order to increase the base color decorative effect of the base glaze, a colorant may be added to the base glaze. The colorant includes but is not limited to cobalt black, golden brown, reddish brown, vanadium blue, fruit green, etc. The colorant may be in the form of an inorganic oxide, including but not limited to iron oxide, copper oxide, chromium oxide, manganese oxide, etc. Other forms such as encapsulated colorants may also be used as needed.

[0027] The base glaze may be applied by spraying. In some embodiments, the base glaze has a specific gravity of 1.4 to 1.55 g / cm 3 , glaze application amount is 500~600g / m 2 .

[0028] After the base glaze is applied, the iridescent glaze is applied on the surface of the body. The raw materials of the base glaze of the iridescent glaze include: by mass percentage, 15-25% of labradorite dry particles, 15-25% of transparent dry particles and 40-60% of suspending agent. Labradorite dry particles can also be called labradorite particles.

[0029] In some technical solutions, the chemical composition of the labradorite dry particles includes: by mass percentage, SiO2: 61-63%, Al2O3: 22-25%, K2O: 1-3%, Na2O: 5-10%, CaO: 5-10%. In other technical solutions, the chemical composition of the labradorite dry particles also includes: by mass percentage, MgO: 0-1%, Fe2O3: 0-0.1%, TiO2: 0-0.1%. XRD characterization of the labradorite dry particles. Figure 1 It can be seen that the labradorite dry particles have labradorite as the main crystal phase and may also contain a small amount of quartz phase and albite phase.

[0030] The mass percentage of labradorite dry particles in the base glaze of iridescent glaze is 15-25%. Too much labradorite dry particles will lead to a large number of pores in the glaze layer, and after firing and polishing, there will be many pits on the glaze surface, and the mirror flatness will be poor.

[0031] Prepare labradorite dry particles. The labradorite mineral is sorted, impurity-removed, and crushed, and then the labradorite dry particles of the desired particle size are prepared by dry particle processing equipment. The labradorite mineral can be a labradorite ore, or a labradorite waste ore, a labradorite scrap, etc. In the above preparation, the labradorite dry particles can be obtained without melting the labradorite mineral. The obtained labradorite dry particles have a layered microstructure, and the iridescent glaze containing the labradorite dry particles can have an iridescent effect.

[0032] Natural labradorite minerals, especially labradorite waste ore and labradorite scraps, usually have defects such as cracks, variegated colors, impurities, etc. Such labradorite waste cannot reach the gemstone level, and therefore cannot bring corresponding economic benefits in the gemstone industry. The present invention uses labradorite dry particles as raw materials for iridescent glaze, which not only realizes the recycling of waste materials, but also the chemical composition and phase composition of the labradorite dry particles can be adapted to other raw materials of iridescent glaze.

[0033] In some technical solutions, the particle gradation of labradorite dry particles includes: in terms of mass percentage, 10-20% below 60 mesh, 50-70% between 60 and 80 mesh, and 20-30% above 80 mesh. Below 60 mesh refers to the part on the sieve that stays on the 60-mesh screen. Above 80 mesh refers to the part under the sieve that passes through the 80-mesh screen. Controlling the particle gradation of labradorite dry particles within the above range can minimize the gap between particles and improve the flatness after firing. If the particle size of the labradorite dry particles is too small, it is easy to melt during the firing process; if the particle size of the labradorite dry particles is too large, the gap between the particles is large, and it is difficult to fill the molten glass phase, and pits are easily formed on the glaze after firing.

[0034] In some technical solutions, the chemical composition of the transparent dry particles includes: by mass percentage, SiO2: 59-61%, Al2O3: 11-16%, CaO: 10-12%, MgO: 1-2.5%, K2O: 5-6.5%, Na2O: 1.5-1.7%, BaO: 0.4-1.5%, ZnO: 5-5.5%. In other technical solutions, the chemical composition of the transparent dry particles also includes: by mass percentage, Fe2O3: 0-0.1%, TiO2: 0-0.1%.

[0035] The initial melting temperature of the transparent dry particles is 950-1050° C. The transparent dry particles with a lower initial melting temperature can cover the labradorite dry particles, which is beneficial to fill the pores between the labradorite dry particles, eliminate bubbles, and avoid glaze defects.

[0036] In the base glaze of iridescence glaze, the mass percentage of transparent dry particles is 15-25%. Too much transparent dry particles will weaken the iridescence effect accordingly.

[0037] In some technical solutions, the particle gradation of transparent dry particles includes: in terms of mass percentage, 0-5% below 80 mesh, 20-30% between 80 and 100 mesh, 30-50% between 100 and 200 mesh, 20-40% between 200 and 325 mesh, and 5-10% above 325 mesh. Below 80 mesh refers to the part on the sieve that stays on the 80-mesh screen. Above 325 mesh refers to the part under the sieve that passes through the 325-mesh screen. Controlling the particle gradation of transparent dry particles within the above range can make the transparent dry particles and labradorite dry particles more densely stacked, improve the flatness of the glaze after applying the iridescent glaze, reduce the firing shrinkage gap, and better wrap the labradorite dry particles to obtain a smooth glaze layer. If the particle gradation of transparent dry particles exceeds the above range, it will result in more pores in the glaze layer after firing, poor transparency of the glaze layer, poor decorative effect, and weak iridescence effect.

[0038] The suspending agent can be glue commonly used in the field of building ceramics.

[0039] In the base glaze of the iridescent glaze, the mass percentage of the suspending agent is 40-60%. If the content of the suspending agent is too much, the glaze effect after firing is poor, and if the content of the suspending agent is too little, the fluidity of the iridescent glaze is poor and the glaze surface flatness is low.

[0040] In addition to the base glaze, the iridescent glaze may also include a colorant. The colorant is not part of the raw material composition of the base glaze. The colorant includes, but is not limited to, cobalt black, golden brown, reddish brown, vanadium blue, fruit green, etc. The colorant may be in the form of a metal oxide, such as iron oxide, copper oxide, chromium oxide, manganese oxide, etc. Colored frit dry particles may also be used as a colorant. The amount of the colorant used may be adjusted according to the color requirements of the product.

[0041] Prepare the iridescent glaze. Weigh the raw material composition of the base glaze of the iridescent glaze, add a colorant as needed, mix well, and obtain the glaze slurry of the iridescent glaze.

[0042] The iridescent glaze can be applied by pouring glaze. The dry particles of labradorite in the iridescent glaze have a large particle size distribution, so spraying glaze and screen printing are difficult to use in the present invention, and it is difficult to achieve the required glazing amount. In some technical solutions, the specific gravity of the iridescent glaze is 1.5-1.6 g / cm 3 , glaze application amount is 900~1200g / m 2 . If the specific gravity of the iridescent glaze is too low, the labradorite particles are easy to precipitate, resulting in a small content of labradorite particles in the glaze layer, and the iridescent effect is not full after firing. If the specific gravity of the iridescent glaze is too high, the glaze curtain is unstable during glazing, the glaze surface flatness is poor, and the labradorite distribution in the glaze layer is uneven. Compared with the conventional glazing amount of decorative glaze, the glazing amount of the iridescent glaze of the present invention is relatively high, and the labradorite particles with larger particle sizes have better iridescent effect in thick glaze layers.

[0043] In some embodiments, the flow rate of the iridescent glaze is 30 to 45 seconds. The flow rate of the iridescent glaze can be measured using a flow rate cup with a diameter of 7 mm.

[0044] The present invention introduces a certain proportion of labradorite dry particles with labradorite as the main crystal phase into the iridescent glaze layer, and utilizes the microscopic layered structure of labradorite to produce interference on light, so that some light waves are enhanced and some light waves are weakened to produce the iridescent effect of color. Since the iridescent effect is exerted in the transparent glaze layer by utilizing the interference effect of the layered microstructure of natural labradorite on light, the original microstructure of the labradorite dry particles should be retained as much as possible and not excessively melted, so that the iridescent effect can be exerted.

[0045] After the iridescent glaze is applied, a full-polished glaze is applied to the surface of the body. In some technical solutions, the chemical composition of the full-polished glaze includes: by mass percentage, SiO2: 59-61%, Al2O3: 11-16%, CaO: 10-12%, MgO: 1-2.5%, K2O: 5-6.5%, Na2O: 1.5-1.7%, ZnO: 5-5.5%, BaO: 0.1-2%. In other technical solutions, the chemical composition of the full-polished glaze also includes: by mass percentage, Fe2O3: 0-0.1%, TiO2: 0-0.1%. Preferably, the chemical composition of the full-polished glaze is consistent with the chemical composition of the transparent dry particles.

[0046] The full-polished glaze can be applied by pouring glaze. In some technical solutions, the specific gravity of the full-polished glaze is 1.5-1.6 g / cm 3 , glaze application amount is 800~1100g / m 2 .

[0047] Firing. The maximum firing temperature is 1170-1220℃, and the firing cycle is 65-80 minutes. If the maximum firing temperature is too low or the firing cycle is too short, the gaps between the labradorite particles will be difficult to fill, which will easily lead to more pores in the glaze layer and poor glaze surface flatness after firing and polishing.

[0048] polishing.

[0049] In order to further enrich the surface decoration of ceramic products, a process of inkjet printing patterns can be added. The process of inkjet printing patterns can be arranged before or after applying the iridescent glaze.

[0050] The present invention uses labradorite dry particles as raw materials for the iridescent glaze, and the labradorite dry particles are randomly distributed in the thickness direction of the iridescent glaze layer, thereby presenting a layered sense of varying depths, which is visually manifested as an optical effect of iridescence. At the same time, the full-polished glaze located above the iridescent glaze layer forms a smooth transparent glaze surface after firing, which can clearly present the decorative effect of the iridescent glaze layer and make the iridescence effect more three-dimensional.

[0051] It is explained here that if the method of in-situ precipitation of labradorite crystal phase is adopted, the iridescence effect will be weak due to the small particle size and low content of the precipitated labradorite crystal phase. The present invention introduces labradorite dry particles in the form of natural minerals. After firing, there are more labradorite crystal phases in the glaze layer and its layered microstructure crystal form is retained. At the same time, the particle size of the labradorite crystal phase is larger, and the iridescence effect is more obvious. The labradorite dry particles retained in the glaze layer after firing, due to their structural characteristics, interfere with the light, offset some light waves, and enhance some light waves, thereby forming an iridescence effect. At the same time, the labradorite dry particles are randomly distributed in three dimensions in the glaze layer, which is more three-dimensional and natural.

[0052] The following examples are further listed to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not limited to the specific values ​​​​exemplified below.

[0053] Example 1

[0054] The method for preparing a ceramic product with iridescent glaze effect comprises the following steps:

[0055] Step 1: Prepare a green body and dry the green body.

[0056] Step 2. Apply the base glaze on the surface of the dried body. The chemical composition of the base glaze includes: by mass percentage, loss on ignition: 3.51%, SiO2: 57.08%, Al2O3: 25.09%, CaO: 0.27%, MgO: 0.22%, K2O: 4.62%, Na2O: 2.74%, ZrO2: 6.30%, ZnO: 0.09%, Fe2O3: 0.08%. The base glaze is applied by spraying, and the specific gravity is 1.44g / cm 3 , glaze application amount is 540g / m 2 .

[0057] Step 3. Apply iridescent glaze on the surface of the body after applying the base glaze. Mix 25 parts of labradorite dry particles, 25 parts of transparent dry particles, 5 parts of manganese dioxide, 5 parts of iron oxide, and 50 parts of suspending agent to obtain iridescent glaze slurry. The chemical composition of labradorite dry particles includes: by mass percentage, ignition loss: 0.83%, SiO2: 61.75%, Al2O3: 23.75%, K2O: 1.41%, Na2O: 5.45%, CaO: 6.65%, MgO: 0.09%, Fe2O3: 0.04%, TiO2: 0.03%. The particle grading of labradorite dry particles includes: by mass percentage, 20% below 60 mesh, 60% between 60 and 80 mesh, and 20% above 80 mesh. The chemical composition of the transparent dry particles includes: by mass percentage, SiO2: 59.90%, Al2O3: 13.73%, CaO: 11.10%, MgO: 1.55%, K2O: 6.15%, Na2O: 1.68%, BaO: 0.46%, ZnO: 5.39%, Fe2O3: 0.02%, TiO2: 0.02%. The application method of the iridescent glaze is glazing. The flow rate of the iridescent glaze is 35s, and the specific gravity is 1.50g / cm 3 , glaze application amount is 1080g / m 2 .

[0058] Step 4. Apply full-polished glaze to the surface of the body after applying the iridescent glaze. The chemical composition of the full-polished glaze includes: by mass percentage, SiO2: 59.90%, Al2O3: 13.73%, CaO: 11.10%, MgO: 1.55%, K2O: 6.15%, Na2O: 1.68%, BaO: 0.46%, ZnO: 5.39%, Fe2O3: 0.02%, TiO2: 0.02%. The full-polished glaze is applied by pouring glaze. The specific gravity of the full-polished glaze is 1.50g / cm 3 , glaze application amount is 1000g / m 2 .

[0059] Step 5. Place in kiln for firing. The highest firing temperature is 1170°C and the firing cycle is 72 minutes.

[0060] Step 6. Polishing, edging, grading, and packaging.

[0061] Figure 1 For brick surface renderings, see Figure 2 (c) The colorant is evenly dispersed in the iridescent glaze, and the elongated dry particles are randomly distributed in three dimensions, which randomly blocks the colorant in the glaze layer, and the overall effect is three-dimensional and natural.

[0062] Example 2

[0063] It is basically the same as Example 1, except that: before applying the iridescent glaze, the pattern is printed on the surface of the blank after applying the base glaze, and the iridescent glaze does not contain colorants such as manganese dioxide and iron oxide. Figure 2 (a).

[0064] Example 3

[0065] It is basically the same as Example 1, except that: the pattern is printed on the surface of the green body after the iridescent glaze is applied, and the iridescent glaze does not contain colorants such as manganese dioxide and iron oxide. Figure 2 (b).

[0066] Figure 2 (a) Due to the covering effect of the labradorite dry particles on the inkjet pattern, it is not conducive to the color rendering of the underlying inkjet pattern, which greatly restricts the inkjet design drawing. Figure 2 (b) After applying the iridescent glaze, an inkjet pattern is printed on the upper layer. Because a large number of labradorite particles are accumulated in the iridescent glaze layer, the surface is uneven and the three-dimensional effect of the inkjet pattern is prominent.

[0067] Example 4

[0068] It is basically the same as Example 1, except that:

[0069] (d) Use only labradorite dry particles with a mesh size of 80 or above;

[0070] (e) Use only labradorite dry particles with a mesh size of less than 60;

[0071] (f) Use only 60-80 mesh labradorite dry particles;

[0072] (g) 10% below 60 mesh, 70% between 60 and 80 mesh, and 20% above 80 mesh.

[0073] like Figure 3 As shown in the figure, (d) the particle size of the labradorite particles is too small, most of them melt during the firing process, and only a few labradorite particles remain in the glaze layer, resulting in a poor iridescence effect; (e) the particle size of the labradorite particles is relatively large, the glaze surface flatness and uniformity are poor after the iridescence glaze is applied, and there are many pores after firing; (f) the distribution of the labradorite particles in the glaze layer is not full enough, the gaps between the particles are large, and the decorative effect is poor; (g) the combination of labradorite particles of appropriate particle size is matched, and particles of various particle sizes are closely stacked to reduce the gaps between the particles. After firing, the labradorite particles are well distributed in the glaze layer, the surface flatness is high, the three-dimensional sense is strong, and the decorative effect is good.

[0074] Example 5

[0075] It is basically the same as Example 1, except that:

[0076] (h) 50 parts of labradorite dry particles, 5 parts of manganese dioxide, 5 parts of iron oxide, and 50 parts of a suspending agent are mixed uniformly to obtain a glaze slurry of an iridescent glaze.

[0077] (i) 40 parts of labradorite dry particles, 10 parts of transparent dry particles, 5 parts of manganese dioxide, 5 parts of iron oxide, and 50 parts of a suspending agent are mixed uniformly to obtain a glaze slurry for an iridescent glaze.

[0078] (j) 25 parts of labradorite dry particles, 25 parts of transparent dry particles, 10 parts of vanadium blue material, and 50 parts of suspending agent are mixed uniformly to obtain a glaze slurry of iridescent glaze.

[0079] like Figure 4 As shown in the figure, (h) transparent dry particles are not used in the iridescent glaze, the high-temperature labradorite dry particles have poor bonding with the base glaze, and the glaze layer is easy to peel off; (i) the content of transparent dry particles in the iridescent glaze is too small, and the gaps between the high-temperature non-melting labradorite dry particles cannot be fully filled. After firing, the surface is porous and pitted, and the glaze surface is poorly smooth after polishing; (j) the ratio of labradorite dry particles to transparent dry particles is appropriate, and the glaze surface is smoother after firing and polishing. At the same time, the glaze layer has a strong three-dimensional sense and a good decorative effect.

[0080] Example 6

[0081] It is basically the same as Example 1, except that:

[0082] (k) Maximum firing temperature 1180°C, firing cycle 43min;

[0083] (l) Maximum firing temperature 1200°C, firing cycle 58min;

[0084] (m) The maximum firing temperature is 1220℃ and the firing cycle is 72min.

[0085] Table 1

[0086]

[0087] From Table 1, it can be seen that when the glaze amount of full polishing is 1080g / m 2 , when the highest firing temperature is 1220℃ and the firing cycle is 72min, there are fewer pit defects on the glaze surface after firing, and the polishing flatness is higher. In addition, the full-polished glaze applied to the surface of the iridescent glaze mainly fills the gaps caused by shrinkage during the firing process, reduces the pores in the glaze layer, weakens or even avoids the pits on the surface after firing, and improves the smoothness of the glaze after polishing. The fewer the pores in the glaze layer, the better the glaze layer is transparent, and the stronger the observed iridescence effect is.

Claims

1. A method for preparing a ceramic product with iridescent glaze effect, characterized in that the preparation method comprises the following steps: Applying base glaze on the surface of the body; Applying iridescent glaze on the body surface after applying the base glaze; the raw material composition of the base glaze of the iridescent glaze includes: by mass percentage, 15-25% of labradorite dry particles, 15-25% of transparent dry particles and 40-60% of suspending agent; the labradorite dry particles have labradorite as the main crystal phase; the chemical composition of the labradorite dry particles includes: by mass percentage, SiO2: 61-63%, Al2O3: 22-25%, K2O: 1-3%, Na2O: 5-10% , CaO: 5-10%; the particle grading of the labradorite dry particles includes: by mass percentage, 10-20% below 60 mesh, 50-70% between 60 and 80 mesh, and 20-30% above 80 mesh; the chemical composition of the transparent dry particles includes: by mass percentage, SiO2: 59-61%, Al2O3: 11-16%, CaO: 10-12%, MgO: 1-2.5%, K2O: 5-6.5%, Na2O: 1.5-1.7%, BaO: 0.4-1.5%, ZnO: 5-5.5%; the particle size distribution of the transparent dry particles includes: In terms of mass percentage, below 80 meshes, 0-5%, 80-100 meshes, 20-30%, 100-200 meshes, 30-50%, 200-325 meshes, 20-40%, and above 325 meshes, 5-10%; the iridescent glaze is applied by pouring glaze; the specific gravity of the iridescent glaze is 1.5-1.6 g / cm 3 , glaze application amount is 900~1200 g / m 2 ; Applying full-polished glaze on the surface of the body after applying the iridescent glaze; The green body with the full glaze applied is fired and polished to obtain a ceramic product with iridescent glaze effect.

2. The preparation method according to claim 1, characterized in that: The chemical composition of the base glaze of the bottom glaze includes, by mass percentage, loss on ignition: 3-4%, SiO2: 52-59%, Al2O3: 20-26%, CaO: 0.1-0.3%, MgO: 0.1-0.3%, K2O: 4-5%, Na2O: 1.8-3.2%, and ZrO2: 5-7%.

3. The preparation method according to claim 1, characterized in that The base glaze is applied by spraying; the specific gravity of the base glaze is 1.4-1.55 g / cm 3 , glaze application amount is 500~600 g / m 2 .

4. The preparation method according to claim 1, characterized in that The chemical composition of the full-polished glaze includes, by mass percentage, SiO2: 59-61%, Al2O3: 11-16%, CaO: 10-12%, MgO: 1-2.5%, K2O: 5-6.5%, Na2O: 1.5-1.7%, ZnO: 5-5.5%, BaO: 0.1-2%; the full-polished glaze is applied by pouring glaze; the specific gravity of the full-polished glaze is 1.5-1.6 g / cm 3 , glaze application amount is 800~1100 g / m 2 .

5. The preparation method according to claim 1, characterized in that: The maximum firing temperature is 1170-1220°C, and the firing cycle is 65-80 minutes.

6. A ceramic product with iridescent glaze effect obtained by the preparation method according to any one of claims 1 to 5.

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