KR101660298B1 - Manufacturing method of underglazed porcelain with patterns using laser - Google Patents

Abstract

The present invention relates to a method for producing a colored glaze, comprising the steps of: firstly firing a molded body; subjecting the color fired glaze to an upper part of the first fired product; irradiating a laser to the green glaze to form a pattern while selectively melting the color glaze; , A step of removing a coloring glaze on a portion not irradiated with a laser, a step of applying a transparent glaze to the upper part of the resultant formed with the pattern, and a step of secondary firing the resultant of the transparent glaze. The present invention relates to a method of manufacturing a lowered patterned pottery. According to the present invention, it is possible to precisely imprint a design pattern by irradiating a laser on a surface of a ceramics water and inducing partial melting of glaze and cleaning an area where energy (laser) is not applied, And it can express complex and diverse patterns by combining laser technology.

Description

Technical Field [0001] The present invention relates to a method of manufacturing a low-porosity ceramic using laser,

More particularly, the present invention relates to a method of manufacturing a patterned pottery, and more particularly, to a method of manufacturing a patterned pottery by irradiating a laser on a surface of a pottery water to induce partial melting of the glaze and washing the energy- The present invention relates to a method of manufacturing a lowered patterned pottery.

Attempts have been made to add aesthetic elements from the beginning of ceramics in human history. Methods ranging from a simple comb pattern to advanced inorganic pigment printing techniques have been diversified and the range of expressions has expanded. At the same time, the development of glaze that dramatically changes the atmosphere of ceramics has widened the design choice range of ceramics.

The glaze is used as a design element by inducing the reduction of strength and absorption rate by forming a vitreous film on the porcelain surface where micropores exist, utilizing the inherent color and texture.

Continuously developing process technologies led to physical quality leveling, and to compete in the market, porcelain (ceramic products) makers placed more importance on productivity improvement. Process technology that can satisfy high productivity is considered as priority even if aesthetic satisfaction is somewhat excluded in the course of defining and approaching ceramics as a mass-produced product. The most widely used transfer paper technique is inexpensive process resources and excellent color expressive power. However, it is the dilemma of pottery makers that their own unique atmosphere and low cost ceramics are recognized.

Productivity and original design are important factors in the mass production ceramic market where physical quality is leveled. To secure product competitiveness, demand for new decorative processes applicable to mass production processes is continuously being demanded and developed. In recent years, there has been a surge in market demand for simple and neat product design rather than colorful color expression in accordance with the trend of minimal design. In the present invention, a technology capable of expressing patterns by selectively melting glaze in accordance with the market trend and the demand of the technology of a company is proposed.

Korean Patent Publication No. 10-2012-0131384

A problem to be solved by the present invention is to irradiate a surface of a ceramics water with a laser to induce partial melting of the glaze and clean the area to which energy (laser) is not applied, thereby precisely imprinting the design pattern and enabling mass production And to provide a method of manufacturing a lower pattern pottery which can express complex and diverse patterns.

The present invention relates to a method for producing a colored glaze, comprising the steps of: firstly firing a molded body; subjecting the color fired glaze to an upper part of the first fired product; irradiating a laser to the green glaze to form a pattern while selectively melting the color glaze; , A step of removing a coloring glaze on a portion not irradiated with a laser, a step of applying a transparent glaze to the upper part of the resultant formed with the pattern, and a step of secondary firing the resultant of the transparent glaze. And a method of manufacturing a lowered patterned pottery using the same.

It is preferable to adjust the output of the laser so that the energy applied to the coloring glaze ranges from 44 to 58J.

The step of removing the coloring glaze in the portion not irradiated with the laser may use a water jet.

The laser may be a laser using CO ₂ as the active medium causing optical amplification.

According to the method of manufacturing a lower patterned ceramics using the laser of the present invention, the surface of the ceramics is irradiated with a laser to induce partial melting of the glaze, and the area where the energy (laser) Can be mass-produced, and it can express complex and diverse patterns by combining laser technology.

Fig. 1 is a view showing the oil surface forming structure according to a raw material of a glaze.
2 is a graph showing the specific heat of the glaze used in the experimental example of the present invention.
FIGS. 3A and 3B are photographs of a result of a specimen # 9 photographed by an optical microscope in Experimental Example 1, FIGS. 4A and 4B are photographs of a specimen # 7 photographed by an optical microscope, , And FIGS. 6A and 6B are photographs of the result of the specimen # 3 photographed by the optical microscope.
FIG. 7 is a diagram showing a schematic diagram of a lower frame technique. FIG.
Fig. 8 is a schematic diagram of the upper frame technique.
Fig. 9 is a schematic diagram showing the lower irradiation process.
10 is a photograph of a specimen completed in the lower irradiation process in Experimental Example 1. FIG.
Fig. 11 is a schematic diagram showing the upper irradiation process. Fig.
12 is a photograph of a specimen completed by the upper irradiation process in Experimental Example 1. FIG.
13 is a photograph showing the molten state of the glaze according to the specimen in Experimental Example 2. FIG.
14A to 14C are scanning electron microscope (SEM) photographs showing cracks generated in Sample # 6 of Experimental Example 2. FIG.
15A to 15C are photographs showing patterns obtained by irradiating a laser in a vector system in Experimental Example 2. FIG.
16A to 16C are photographs showing patterns obtained by irradiating a laser in the raster method in Experimental Example 2. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

Pottery is a term that includes pottery and porcelain. In the following, the term "porcelain" means to include porcelain and porcelain, and "porcelain" means porcelain with patterns on the surface of porcelain. Ceramics are mainly made of materials such as clay, feldspar, silica, pyrophyllite, and stonite. Ceramics are products obtained by mixing and molding these materials at a certain ratio, followed by firing and curing. Pottery has a high absorption rate, so it produces a dull sound when tapped and has a relatively low durability. It has a low absorption rate and gives a clear sound when touched and has excellent durability. Ceramics include ceramics such as tiles.

Industrial ceramics, which need to consider productivity together, have limitations in the selection of decorative techniques. Increasing productivity to secure market competitiveness Demand is due to the manufacturing aspect of ceramics. The flow of accepting automated processes and trying to converge with information technology is the direction of industrial ceramics.

Increasing the decorative elements of ceramics causes a decrease in productivity. The transfer paper decoration technique suitable for mass production requires an additional heat treatment process, and the coloring and sculpting technique reduces the productivity to a level that can not be mass produced. Therefore, there is a need for research on decorative techniques that satisfy design factors and productivity.

The glaze forms a vitreous film on the porcelain surface where the micropores exist, inducing the strength enhancement and the reduction of the absorption rate, and exhibiting the inherent color and texture. There is an attempt to use the color and texture of glaze as a design element. It is attempted to differentiate the design by partially using different glaze, or to exclude a specific area in the process of glazing and to express the pattern using glaze . However, the design obtained through the control process must manually correct the glaze interface, which causes the productivity to drop.

The inventors of the present invention have studied a method for quickly and accurately marking a design pattern of a user by fusing a liquid and a laser in a pattern designing method of ceramics applicable in a mass production process. The present invention establishes a technique for selectively melting a glaze used on a ceramic surface using a laser, and suggests a method that can be utilized as a design element.

Using the laser on the surface of the ceramics water, induced partial melting of the glaze, and clean the area where the energy (laser) is not applied, precisely imprinting the design pattern. We propose a method of observing the melting state of glaze with laser power change by optical microscope, analyzing optimum condition, and engraving digital pattern using partial melting of glaze after washing process and firing process.

A method of manufacturing a lower patterned ceramics using a laser according to a preferred embodiment of the present invention includes the steps of: firstly firing a molded body; subjecting a coloring glaze to a first baked resultant; A step of forming a pattern while selectively melting a coloring glaze, a step of removing a coloring glaze of a part not irradiated with a laser, a step of applying a transparent glaze to the upper part of the product formed with the pattern, And a second firing step.

Hereinafter, a method of manufacturing a lower patterned ceramic using a laser will be described in more detail.

Clay, silica, feldspar, etc. are mixed together with a solvent (e.g., water). The ceramics raw material may be undifferentiated using a pulverizing process such as a ball milling machine. The ball milling process will be described below. The balls are rotated at a constant speed using a ball milling machine containing a ceramic material and a solvent. It is preferable to mix the solvent so that the solids content of the ceramic material becomes 40 to 70%. The ball used for the ball milling is preferably a ceramic ball such as alumina or zirconia, and the balls may be all the same size or may be used together with balls having two or more sizes. The size of the ball, the milling time, and the rotation speed per minute of the ball miller. For example, in consideration of the size of the particles, the size of the balls may be set in the range of about 1 mm to 50 mm, and the rotational speed of the ball miller may be set in the range of about 50 to 500 rpm. The ball milling is preferably performed for 1 to 48 hours. By ball milling, the ceramic material is pulverized into fine sized particles and has a uniform particle size distribution. By stirring as described above, the raw material of the ceramics is pulverized to form a slurry state.

The resultant mixture is molded to form a formed body. The molding can be carried out by various known methods such as injection molding, extrusion molding, and the like.

The formed body is firstly baked. The first firing is preferably performed at a temperature of about 800 to 1000 DEG C for about 10 minutes to 48 hours.

Color glaze is applied to the top of the first fired product. The coloring glaze is a glaze containing an inorganic pigment expressing hue, and the glaze used for manufacturing ceramics is not limited thereto. The glaze forms a vitreous film on the porcelain surface where the micropores exist, inducing the strength enhancement and the reduction of the absorption rate, and exhibiting the inherent color and texture.

As inorganic pigments, oxides such as zinc, copper, iron, lead, chromium and cobalt are known. The inorganic pigment may be a pigment having various colors and may be a pigment that develops colors such as black (K), cyan (C), magenta (M), yellow (Y) .

More specifically, CoAl ₂ O ₄ has a spinel structure, is thermally and chemically stable, and can be used as an inorganic pigment that emits blue (cyan). Examples of such blue-based inorganic pigments include Mg _{1 - x} Co _x Al ₂ O ₄ (0.1 _{? X? 1} ) based powder, Mg _{1 - x} Ni _x Al ₂ O ₄ (0.1? _{X? 1} ) based powder, have.

Examples of the red (magenta) inorganic pigment include CaSn _{1 - x} Cr _x SiO ₄ (0.01? _X? 0.5) based powder and the like.

To yellow (yellow) based inorganic pigments _{Zr 1 - x Ce x SiO 4} (0.01≤x≤0.5) based _{powder, Zr 1 -x Pr x SiO 4} (0.01≤x≤0.5) based powder, Zr _{1 - x} Ta _x SiO ₄ (0.01? _x? 0.5) powder or a mixture thereof.

Examples of the black (black) inorganic pigment include Co (Fe _{1 - x} Cr _x ) ₂ O ₄ (0.01? _X ? 0.5) powder and the like.

The green colored glaze is irradiated with a laser to selectively melt the color glaze to form a pattern. The laser may be a laser using CO ₂ as an active medium for causing optical amplification, but the present invention is not limited thereto, and a YAG laser or the like may also be used. It is preferable to adjust the output of the laser so that the energy applied to the coloring glaze ranges from 44 to 58J.

And removes the coloring glaze at the portion where the laser is not irradiated. The area where the laser is not applied is cleaned and removed. The removal of the coloring glaze on the portion not irradiated with the laser may use WaterJET, but is not limited thereto. The water jet is well known in general, so a detailed description thereof will be omitted here. WaterJet can be used commercially sold.

Transparent glaze is applied to the top of the patterned product. The transparent glaze is not limited as long as it is a glaze used for manufacturing ceramics. It is preferable that the transparent glaze be entirely applied not only to the portion where the pattern is formed by the coloring glaze but also to the portion where the coloring glaze is removed.

The resultant with transparent glaze is fired secondarily. The secondary firing is preferably performed at a temperature of about 1000 to 1600 DEG C for about 10 minutes to 48 hours.

Hereinafter, experimental examples of the present invention will be presented.

<Experimental Example 1>

Application of lasers to the field of material processing began in the late 1960s, and high power CO ₂ and YAG lasers have developed to become common in many industries. Applications of lasers in material processing include cutting, welding and drilling of metals, scribing of ceramics, cutting of plastics and composites, and marking of various materials. Common to all such applications is a thermal mechanism that melts and evaporates material by laser irradiation.

Table 1 below shows the characteristics of the laser equipment used in the experimental example of the present invention.

Specifications Dimensions 44 × 39 × 36 in Rotary Capacity Max Diameter 8 in (203 mm) Focus Lenses 2.0 in (51 mm) Type CO ₂ watts 60 Watts Power Requirements 110V / 10A; 220V-240V / 5A

As a laser using CO ₂ as an active medium for causing optical amplification, it is possible to irradiate an energy of 60 J at the maximum. Due to the nature of ceramics with excellent heat resistance, it is difficult to cut with stomach energy. However, when continuously irradiating the unmelted glaze, the surface temperature rapidly increases, and when the glaze melting temperature is exceeded, the glaze is vitrified without firing.

Laser irradiation is divided into raster and vector according to the image.

A raster is one method of representing image information in a computer, which means that an image is composed of pixels in the form of a two-dimensional array, the shapes of these points are combined, and one image information is represented by pixels at regular intervals. The raster automatically adjusts the output depending on the brightness of the image. Therefore, it is possible to express the change in brightness of the original with the laser output.

The vector is a method of moving the focus of the laser along a linearized pattern. Since it is possible to maintain a fast processing and a uniform output, a vector irradiation method is used in this experimental example.

Quartz, which is the main material of glass, melts at temperatures above 1600 ℃, but in the ancient Middle East, it found that the melting point is low when mixed with salt, and tried to apply it to pottery. It is the first glaze that glass is crushed, and the purified soil and soda are mixed and are garnished on the pottery surface. After that, the glaze in China 's magnetic technology has established the appearance of modern glaze with perfect adhesion and absorptivity.

In ceramics, glaze is used for two main reasons.

First, it is durable. The most basic purpose of the glaze is to increase the strength of the ceramics and to remove the absorptivity to facilitate cleaning and use.

Second, it is aesthetic. Glaze gives the character of the pottery. The various oxides added to the glaze represent the unique color and texture, which greatly influences the aesthetic elements of ceramics.

Other insulators of electric devices or ceramics used in special industries may use glazes for the purpose of insulation and cutting.

In general, the glaze is composed of three components of basic oxides (RO, R ₂ O), neutral oxides (R ₂ O ₃ ) and acidic oxides (RO ₂ ), and basic oxides combine with acidic oxides at high temperatures to form vitreous . Table 2 shows the representative types of oxides used in the glaze, and FIG. 1 shows the structure in which the raw material of the glaze forms the oil surface. FIG. 1 shows the oil surface formation structure according to the glaze raw material.

Basic oxide Neutral oxide Acidic oxide Na ₂ O Al ₂ O ₃ SiO ₂ K ₂ O Fe ₂ O ₃ ZrO ₂ CaO Cr ₂ O ₃ TiO ₂ MgO Mn ₂ O ₃ SnO ₂ BaO B ₂ O ₃ - ZnO Sb ₂ O ₃ - LiO - - PbO - -

As the mineral refining technology developed, the glaze continued to develop. By controlling the additive oxides, the melting temperature can be freely controlled, and thermal expansion can be controlled to induce cracking, crack free, and strength increase effect. However, unlike the properties of glaze that have been continuously developed, the method of glazing has less development than the ancient glaze which was first used. Still, the dipping method and the spraying method are the most common method, and the limitation of this method makes it difficult to design using the glaze. The immersion method is a method of immersing the water in the glaze, which is the most commonly used watering method, and the cost is low and the watering time is possible. The spraying method is a method of spraying glaze using a spray gun to form a glaze surface on the surface of ceramics, and it is popularly adopted in a mass production process because it can rapidly uniform thickness.

In this experimental example CO ₂ Laser and transparent flow conditions were limited and the following two conditions were analyzed.

First, the results according to laser power and speed were analyzed. The transparent glass (transparent glaze) - modified white porcelain specimens were analyzed by optical microscope.

Second, the results were analyzed according to the plasticity of the specimen. The position of the vitreous composing the pattern was artificially changed to confirm the difference in the results.

The melting temperature of transparent glazes used in ceramics is more than 1220 ℃. If the melting temperature is not exceeded, the glaze can not be completely vitrified. On the contrary, when the temperature becomes high, vaporization starts and a pin hole is formed on the surface of the enamel. On the other hand, the glaze that has undergone the sintering process can induce sufficient re-melting at the formation temperature of 750-800 ° C. To estimate the energy required to melt the glaze and calculate the calories, the specific heat of the glaze was measured using LabSYS TG-DSC-DTA specific heat meter. Table 3 below shows specifications of the specific heat measuring instrument used in the present invention.

Spec Temperature range Ambient to 1600 ℃ Heating rate 0.01 ° C to 100 ° C / min Balance Capacity 20g Measuring range 200 mg / 1 g Balance Resolution 0.02 g / 0.2 g

2 is a graph showing the specific heat of the glaze used in this experiment. It is predicted that the specific heat changes as the physical properties of the glaze change with the temperature change.

In Fig. 2, the specific heat value of the inferred glaze was substituted into Equation 1 to deduce the required energy.

[Equation 1]

Equation 1 shows the relationship between specific heat and calorie, c is specific heat, m is mass, Δ is temperature change, and Q is calorie.

Equation 2 below represents the predicted energy required for glaze melting. In Equation (2), m means gram (g) which is a unit of mass.

&Quot; (2) &quot;

Based on the predicted energy required in Equation (2), the irradiation condition was set as shown in Table 4 below and the specimen was analyzed.

division Laser output Investigation time Final output Sample # 1 40 watts 800ms 32J Sample # 2 45watts 800ms 36J Sample # 3 50watts 800ms 40J Sample # 4 55watts 800ms 44J Sample # 5 60watts 800ms 48J Sample # 6 60watts 900ms 54J Sample # 7 60watts 1000ms 60J Sample # 8 60watts 1100ms 66J Sample # 9 60watts 1200ms 72J Sample # 10 60watts 1300ms 78J

The specimens were examined under the conditions shown in Table 4 and analyzed using OLYPUMS SZ61 optical microscope.

The irradiated region was enlarged 108 times to compare the molten state and interface. Figures 3a and 3b are photographs of the result of specimen # 9 taken with an optical microscope, Figures 4a and 4b are photographs of specimen # 7 taken with an optical microscope, and Figures 5a and 5b are photographs of specimen Figure 5 is a photograph of the result, and Figures 6A and 6B are photographs of the result of the specimen # 3 photographed by an optical microscope.

In Sample # 1 ~ # 3, the laser output was insufficient, so that the glaze could not be completely fused and fused.

When the output exceeded 60 J, the melting of the glaze was abruptly performed, and the thermal energy was scattered and scattered, and the melting interface was irregularly formed. In addition, the pattern resolution was decreased due to melting of the region larger than the laser irradiation range.

The specimens irradiated with energy of 75 J or more were cracked due to thermal shock.

60 watt (Watts) of CO ₂ When the laser was irradiated for more than 1000 ms, the temperature rapidly increased and the glassy interface was irregularly formed. When the laser was irradiated for less than 800 ms, the vitreous formation of the glaze was not sufficiently progressed and the glass was detached from the specimen. When the energy of 48 J was irradiated, it was confirmed that the glaze was melted and had the best resolution.

The sample # 5 melted to a thickness of less than the minimum power not generating a chip was determined as an optimum condition and the actual pattern design was investigated.

There are two ways to apply patterns on ceramics.

First, the lower decoration is the way in which the oxides constituting the pattern are located between the glaze and the substrate. The vitreous surface protects the surface perfectly and has excellent corrosion resistance and smooth surface texture. However, it is affected by the color of the glaze, and the oxides constituting the pattern form a film to interfere with the uniform flow. Monochrome transfer paper, high-temperature hand painting and traditional patterns are included in the underlay. FIG. 7 is a diagram showing a schematic diagram of a lower frame technique. FIG.

Second, the top decoration is the way in which oxides constituting the color are placed on the coated glass. It is easy to use transfer paper and is widely used in mass production ceramics. However, after the ceramics glaze is vitrified, a heat treatment process is added as compared to the sub-glazing technique with the possible patterning technique. Fig. 8 is a schematic diagram of the upper frame technique.

In this experiment, the results obtained by changing the laser irradiation position according to the structure of the decoration technique were analyzed.

Using the Adobe Illustrator, the images used in this experiment were produced. An image composed of vector data was produced and an irregular curve was arranged with a narrow interval so that the change in resolution due to melting of the glaze could be easily observed. In order to increase the resolution of the pattern, the stroke was set to 0.001pt, which is the minimum irradiation thickness supported by the laser equipment.

1. Lower survey

The glaze was uniformly applied to the specimen after the first firing process, and the irradiated surface was irradiated with laser. The unmelted glaze was removed using WaterJET, the glaze having different color was reapplied and the secondary firing was carried out. Fig. 9 is a schematic diagram showing the lower irradiation process.

The specimens completed by the lower irradiation process are excellent in the color development of the glaze melted by laser irradiation, have an additional glass quality, have a smooth surface, and are excellent in corrosion resistance. However, the process is complicated as compared with the upper irradiation, and the glaze constituting the pattern is melted again in the secondary firing process, and the resolution is lowered. Fig. 10 is a photograph of the psalm completed by the lower inspection process.

2. Research by the Supreme Council

The secondary sintering is completed and the glass is formed on the surface of the specimen. The glaze is added as a method of heating spraying used in this china process since the specimen with absorptivity disappeared is difficult to be dyed with conventional dipping method. Fig. 11 is a schematic diagram showing the upper irradiation process. Fig.

The specimens completed by the upper irradiation process are more productive because they do not require additional firing process, and the laser irradiated boundaries are clearer than the specimens completed by the lower irradiation process. However, since the glaze melted by the laser is exposed on the surface, the abrasion resistance is weak, and the surface roughness is not continuous. In addition, it does not show sufficient coloring compared with the lower irradiation process. Fig. 12 is a photograph of the psalm completed by the upper survey process.

As described above, the laser is fused to the process of sieving to improve the process, and the possibility of being used in the mass production process is confirmed. The optical microscope analysis shows that the best pattern formation can be achieved when the energy applied to the glaze surface is 48J. The lower irradiation process expresses strong durability and clear color, and the upper irradiation process leads to high resolution and productivity improvement .

The present invention presents a new direction to the static feeding method. It is possible to easily and quickly apply a required pattern by presenting basic data for controlling the melting of the glaze by using a laser. The convergence of digital technologies also implies the possibility of development as tailor-made products without redundant costs. It is expected that the competitiveness of the market will be secured by presenting the data and methodology analyzed in the present invention to the ceramics industry where the new technology convergence speed is slow.

<Experimental Example 2>

In FIG. 2, the specific heat value of the glaze inferred is used to deduce the energy required for glaze melting.

&Quot; (3) &quot;

The specimen production range was set on the basis of Equation (3) for the specific heat of the measured glaze. Table 5 shows the specimen conditions used in the experiment.

division Sample # 1 Sample # 2 Sample # 3 Sample # 4 Sample # 5 Sample # 6 Laser output 50W 55W 60W 50W 55W 60W Investigation time 800ms 800ms 800ms 1000ms 1000ms 1000ms Final output 40J 44J 48J 50J 55J 60J

The specimens subjected to the laser irradiation according to the irradiation conditions in Table 5 were analyzed for the interface and melting state using an OLYPUMS SZ61 optical microscope. 13 shows the molten state of the glaze according to the specimen. Specimens with irradiated energy less than 44 J failed to melt the glaze in some areas. Excess energy was injected in specimen No. 6, and cracks were generated around the melting region. This is because the temperature of the oil surface is rapidly changed due to the laser irradiation, and it is judged that the heat shock crack is generated.

Sample # 6 In order to observe the microstructure of the crack, a Pt-coated SEM (Scanning Electron Microscopy) (Jeol, JSM-6390) analysis was performed. 14A to 14C are scanning electron microscope (SEM) photographs showing cracks occurring in Sample # 6. Cracks due to sudden temperature changes on the oil surface were observed. Microcracking implies the possibility that glassy particles can be discharged to the outside, and the corrosion resistance and abrasion resistance are weak.

The energy predicted in Equation (3) was the most suitable for Sample # 5, but the optical microscope analysis showed that the irradiation condition of Sample # 3 was the most favorable melting state of the glaze. It is judged that an error has occurred due to the focal length of the laser and the condition of the lens. Sample # 3 was used as a reference condition for pattern formation and individual specimens were prepared according to the laser irradiation method.

The vector laser irradiation method follows the concept of line processing. It is a method to rapidly process the laser output by fixing the output along the boundary of the image, which is popularly used for cutting the material. 15A to 15C show patterns obtained by laser irradiation in a vector manner.

The pattern formed by the vector laser irradiation specimen is excellent in readability and excellent in corrosion resistance due to the structure of the pattern due to the melting of the glaze. However, the thickness variation of the specimen affected the output resolution by changing the focal length of the laser. In addition, sudden temperature changes occurring during the energy irradiation process are considered to be caused by residual carbon on the oil surface. Failure to effectively control the residual carbon results in a change in the color of the pattern and a change in resolution depending on the focal length.

Lester is a faceted laser irradiation method. And selectively controls the output of the laser based on the brightness of the output image. 16A to 16C show patterns obtained by laser irradiation in the raster method.

In the laser irradiation area, the selective melting of the glaze occurred and fine surface unevenness was formed, and the inner bubble was formed due to the rapid temperature change. Unevenness and bubbles on the surface induce the diffuse reflection of light to form a pattern having a unique texture.

 The method of constructing the pattern by selectively melting the oil surface coated on the surface of the ceramics by using the laser satisfies productivity and aesthetics at the same time. In addition, it is expected to secure the competitiveness of the pottery as a decoration technique which has not been tried. The decorative technique that forms the pattern by selectively forming fine irregularities and bubbles through the laser irradiation maintains the esthetics and corrosion resistance inherent in the ceramics, and has the advantage that the pattern can be formed quickly and easily.

As described above, the development of a new ceramics decoration technique is expected by analyzing the method of forming the pattern through the selective melting effect of the glaze using the laser, and presenting the result according to the irradiation energy and the method.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

Claims (4)

Firstly firing the molded body;
A step of sowing a coloring glaze on the first fired product;
Forming a pattern while selectively irradiating a green color glaze with a laser to selectively melt the coloring glaze;
Removing a coloring glaze at a portion where the laser is not irradiated;
Applying a transparent glaze to the top of the resulting product with the pattern; And
And secondly firing the resulting transparent glaze-treated product,
The coloring glaze is a powder of Mg _1-x Co _x Al ₂ O ₄ (0.1 _{? X? 1} ), a powder of Mg _1-x Ni _x Al ₂ O ₄ (0.1? _{X? 1} ) or is a blue-based inorganic pigments, including mixtures _{thereof, CaSn 1-x Cr x SiO} 4 (0.01≤x≤0.5) , or red based inorganic pigment containing-based _{powder, Zr 1-x Ce x SiO} 4 (0.01≤x _X? 0.5) system powder, Zr _1- xPr _x SiO ₄ (0.01? _X? 0.5) system powder, Zr _1-x Ta _x SiO ₄ (0.01? _X? 0.5) system powder, Pigment or a black inorganic pigment containing a powder of Co (Fe _1-x Cr _x ) ₂ O ₄ (0.01? _X ? 0.5)
Controlling the output of the laser so that the energy applied to the coloring glaze ranges from 44 to 58J,
The step of removing the coloring glaze in the portion not irradiated with the laser is performed by using a water jet,
Wherein the laser is a laser using CO ₂ as an active medium for causing optical amplification. delete delete delete

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