KR102186569B1 - Color implementing method of metal surface using heat treatment and surface color implemented metal panel - Google Patents

Abstract

The present invention is a method of realizing a color of a metal surface using heat treatment to realize a variety of colors on a metal surface by forming an oxide film layer to realize a color group by performing heat treatment under different conditions on the LIPSS surface, and a metal plate with surface color It aims to provide.
An embodiment of the present invention for achieving the object of the present invention described above, by using a laser to form a laser-induced periodic surface structure (LIPSS) on the surface of a metal member; A heat treatment condition setting step of setting a heat treatment condition for the metal member on which the laser-induced periodic surface structure is formed for realizing a desired color group; And performing a heat treatment under the set heat treatment conditions to form a color group realization oxide film layer on the upper surface of the laser-induced periodic surface structure of the metal member to implement a color of a desired color group. It provides a method of implementing the color of a metal surface using a heat treatment characterized.

Description

Color implementing method of metal surface using heat treatment and surface color implemented metal panel}

The present invention relates to implementing a surface color on a metal, and more particularly, by performing heat treatment on the LIPSS surface under different conditions to realize a color group by forming an oxide layer to implement various colors on the metal surface. The present invention relates to a method of implementing a color of a metal surface using heat treatment and a metal plate having a color of the surface.

In recent years, the demands of consumers to satisfy the aesthetics of the surface of steel plates used as interior and exterior materials for buildings, exterior materials for home appliances, interior and exterior materials for automobiles, etc. have been very high. Accordingly, metal plates with various colors are being supplied to satisfy the taste of consumers.

As a method of implementing the color of the metal surface described above in the prior art, the coating technology or coating technology disclosed in Korean Patent Registration No. 10-0171679 has been widely used.

However, since the above-described conventional painting technology or coating technology, which is a method of implementing the color of the metal surface, uses volatile organic compounds or electrolytic solutions for plating, a large amount of environmentally harmful substances such as volatile substances, plating metals or chemicals are generated. There was a problem.

Also, whenever the color of the metal is implemented. Since a combination of painting or coating materials is used, the reproducibility of color realization is degraded. After a metal plate with colors is manufactured using the same painting or coating material for a certain period, the same color is again applied to the surface of the metal plate. It has a problem that it is impossible to implement.

In addition, when the color is implemented on the metal surface by painting or coating, as in the above-described conventional techniques, since reproducibility is lowered, there is also a problem that mass production is not easy.

Korean Patent Registration No. 10-0171679

Therefore, one embodiment of the present invention for solving the problems of the prior art described above is to form a LIPSS (Laser Induced Periodic Surface Structure) on the metal using a femtosecond laser that has a relatively short process time and easy process control, and the heat treatment temperature The color group implementation method and surface color of the metal surface using heat treatment that allows various colors to be realized on the metal surface without environmental pollution by forming an oxide film layer by performing the heat treatment process while varying the time and time. It is an object of the present invention to provide an implemented metal plate.

In addition, another object of the present invention is to provide a method of implementing color of a metal surface using heat treatment that enables mass production and a method of implementing color of a metal surface and a metal plate in which the color of the surface is implemented.

In addition, the present invention aims to provide a metal surface color realization method using heat treatment and a metal plate material in which the surface color is implemented so that natural colors and textures can be realized according to user preferences or needs by controlling the heat treatment process. do.

An embodiment of the present invention for achieving the object of the present invention described above, by using a laser to form a laser-induced periodic surface structure (LIPSS) on the surface of a metal member; A heat treatment condition setting step of setting a heat treatment condition for the metal member on which the laser-induced periodic surface structure is formed for realizing a desired color group; And performing a heat treatment under the set heat treatment conditions to form a color group realization oxide film layer on the upper surface of the laser-induced periodic surface structure of the metal member to implement a color of a desired color group. It provides a method of implementing the color of a metal surface using a heat treatment characterized.

The laser is characterized in that it is a femtosecond laser.

In the forming of the laser-induced periodic surface structure, the laser-induced periodic surface structure is formed by controlling the scan irradiation speed of the femtosecond laser so as to have a pattern expressing a preset color.

The metal constituting the metal member is characterized in that any one of a non-ferrous metal or an iron-based metal.

The non-ferrous metal may be at least one selected from the group including Cu, Zn, Au, Ag, Al, Ti, W, Ni, Mo, Co, Mg, or alloys thereof.

The iron-based metal may be at least one selected from the group containing Fe or an Fe alloy.

The heat treatment condition is characterized in that it is set among conditions performed for 20 minutes to 60 minutes at a temperature of 150 ℃ to 350 ℃.

In the method for implementing a color of a metal surface using heat treatment according to an embodiment of the present invention described above, after the step of implementing the color of the desired color group, the viewing angle and the crossing angle of the viewing angle with the unit pattern forming the laser-induced periodic surface structure Providing a surface refractive index of forming a transparent polymer layer having a refractive index corresponding to a specific viewing angle and an intersection angle to express a specific color among colors included in the desired color group expressed according to the color group on the top of the oxide film layer implementing the color group; It may further include.

Another embodiment of the present invention for achieving the object of the present invention described above, a metal member; A laser induced periodic surface structure (LIPSS) formed on the metal member; And a color group realization oxide film layer formed on top of the laser-induced periodic surface structure by performing a heat treatment process according to a heat treatment condition corresponding to the realization of a desired color group. Provide a metal plate.

The laser is characterized in that it is a femtosecond laser.

In the forming of the laser-induced periodic surface structure, the laser-induced periodic surface structure is formed by controlling the scanning irradiation speed of the femtosecond laser so as to have a pattern expressing a preset color.

The metal constituting the metal member is characterized in that any one of a non-ferrous metal or an iron-based metal.

The non-ferrous metal may be at least one selected from the group including Cu, Zn, Au, Ag, Al, Ti, W, Ni, Mo, Co, Mg, or alloys thereof.

The iron-based metal may be at least one selected from the group containing Fe or an Fe alloy.

The heat treatment condition is characterized in that it is set among conditions performed for 20 minutes to 60 minutes at a temperature of 150 ℃ to 350 ℃.

The metal plate may display a specific color among colors included in the desired color group expressed according to a viewing angle on an upper portion of the color group-implementing oxide layer and an intersection angle of a field of view with a unit pattern forming the laser-induced periodic surface structure. It characterized in that it is configured to further include; a transparent polymer layer whose refractive index is adjusted for.

According to embodiments of the present invention, since the heat treatment process is performed, it provides an effect of implementing a natural color and texture on the metal surface according to the user's preference according to the control of the heat treatment process conditions.

In addition, according to the embodiments of the present invention, by forming an oxide film layer for realizing color groups on the metal surface by using the formation of LIPSS by femtosecond laser processing and heat treatment process, which has a relatively short process time and easy process control, The reproducibility of realizing the same color on the surface is remarkably improved, and the process efficiency is remarkably improved because the heat treatment process that is easy for mass production is applied, enabling mass production of metal plates with colors on the surface with high color reproducibility. Let's do it.

In addition, the embodiments of the present invention form a LIPSS (Laser Induced Periodic Surface Structure) on the metal using a femtosecond laser that has a relatively short process time and easy process control, and an oxide layer for realizing a color group by varying the heat treatment process. It provides the effect of implementing various colors on the metal surface without causing environmental pollution by forming.

1 is a view showing a processing process of a method for implementing color of a metal surface using heat treatment according to an embodiment of the present invention.
2 is a view showing a metal surface color implementation process using heat treatment according to an embodiment of the present invention.
3 is a cross-sectional view of a metal plate in which the surface color of another embodiment of the present invention is implemented.
4 is a graph showing changes in the brightness of a metal surface according to heat treatment conditions of a metal plate of an experimental example.
5 is a graph showing changes in brightness of a metal surface according to heat treatment conditions of a metal plate of an experimental example.
6 is a view showing the color change according to the viewing angle and crossing angle of a pure copper plate material in which LIPSS is not formed.
Figure 7 shows the scanning and irradiation of a femtosecond laser at 2.5mm/s(a), 5mm/s(b) and 6mm/s(c) to form LIPSS, and then according to the viewing angle and crossing angle of the copper plate without heat treatment. A drawing showing color change.
8 is a view according to the viewing angle and the crossing angle of the copper plate not subjected to heat treatment after forming LIPSS by scanning and irradiating a femtosecond laser at 2.5mm/s (a), 5mm/s (b) and 6mm/s (c) A drawing showing color change.
9 shows a color group by performing a heat treatment at 200°C for 60 minutes after scanning and irradiating a femtosecond laser at 2.5mm/s(a), 5mm/s(b) and 6mm/s(c) to form a LIPSS. A view showing the color change according to the viewing angle and crossing angle of the formed copper plate.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and therefore is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, bonded)" with another part, it is not only "directly connected", but also "indirectly connected" with another member in the middle. "Including the case. In addition, when a part "includes" a certain component, it means that other components may be further provided, rather than excluding other components unless specifically stated to the contrary.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

An embodiment of the present invention includes the steps of forming a laser induced periodic surface structure (LIPSS) on the surface of a metal member using a laser; Setting heat treatment conditions for the metal member on which the laser-induced periodic surface structure is formed for realizing a desired color group; And performing a heat treatment under the set heat treatment conditions to form a color group realization oxide film layer on the upper surface of the laser-induced periodic surface structure of the metal member to implement a color of a desired color group. It provides a method of implementing the color of a metal surface using a heat treatment characterized.

The laser is characterized in that it is a femtosecond laser.

In the forming of the laser-induced periodic surface structure, the laser-induced periodic surface structure is formed by controlling the scanning irradiation speed of the femtosecond laser so as to have a pattern expressing a preset color.

The metal constituting the metal member is characterized in that any one of a non-ferrous metal or an iron-based metal.

The non-ferrous metal may be at least one selected from the group including Cu, Zn, Au, Ag, Al, Ti, W, Ni, Mo, Co, Mg, or alloys thereof.

The iron-based metal may be at least one selected from the group containing Fe or an Fe alloy.

The heat treatment condition is characterized in that it is set among conditions performed for 20 minutes to 60 minutes at a temperature of 150 ℃ to 350 ℃.

The method for implementing a color of a metal surface using a heat treatment according to an embodiment of the present invention described above is, after the step of implementing the color of the desired color group, according to a viewing angle and an intersection angle with a unit pattern forming the laser-induced periodic surface structure. It may further include a surface refractive index imparting step of forming a transparent polymer layer having a refractive index corresponding to a specific viewing angle on top of the color group realization oxide layer for expressing a specific color among colors included in the desired color group to be expressed; have.

Another embodiment of the present invention for achieving the object of the present invention described above, a metal member; A laser induced periodic surface structure (LIPSS) formed on the metal member; And a color group realization oxide film layer formed by performing a heat treatment process according to a heat treatment condition corresponding to the realization of the desired color group. It provides a metal plate material having a surface color, characterized in that it comprises.

The laser is characterized in that it is a femtosecond laser.

In the forming of the laser-induced periodic surface structure, the laser-induced periodic surface structure is formed by controlling the scanning irradiation speed of the femtosecond laser so as to have a pattern expressing a preset color.

The metal constituting the metal member is characterized in that any one of a non-ferrous metal or an iron-based metal.

The non-ferrous metal may be at least one selected from the group including Cu, Zn, Au, Ag, Al, Ti, W, Ni, Mo, Co, Mg, or alloys thereof.

The iron-based metal may be at least one selected from the group containing Fe or an Fe alloy.

The heat treatment condition is characterized in that it is set among conditions performed for 20 minutes to 60 minutes at a temperature of 150 ℃ to 350 ℃.

The metal plate material further comprises a transparent polymer layer having a refractive index adjusted to express a specific color among colors included in the desired color group displayed on an upper portion of the color group-implementing oxide film layer according to a viewing angle. do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a processing process of a method of implementing color of a metal surface using heat treatment according to an embodiment of the present invention, and FIG. 2 is a view showing a process of implementing color of a metal surface using heat treatment according to an embodiment of the present invention. It is a configuration diagram of a metal plate in which the surface color of another embodiment of the present invention is implemented.

1 and 2, the metal surface color method according to an embodiment of the present invention described above includes a LIPSS forming step (S10), a heat treatment condition setting step (S20), a desired color group implementation step (S30), and a surface refractive index imparting step. It is configured to include (S40).

In addition, the metal plate 1 in which the surface color of the embodiment of the present invention is implemented, manufactured by the sequence and process of FIGS. 1 and 2, is, as shown in FIG. 3, the metal member 10 and the metal member 10. It comprises a laser induced periodic surface structure (LIPSS) (LIPSS 11) formed thereon, an oxide film layer 20 implementing a color group, and a transparent polymer layer 30.

Specifically, in the LIPSS forming step (S10), a LIPSS 11 having a pattern corresponding to a color group to be implemented using a femtosecond laser having a power of 1 kW to 3 kW is formed on the surface of the metal member 10. At this time, the metal member 10 is formed of any one of a non-ferrous metal or an iron-based metal. The non-ferrous metal may be at least one selected from the group including Cu, Zn, Au, Ag, Al, Ti, W, Ni, Mo, Co, Mg, or alloys thereof. And the iron-based metal may be one or more selected from the group containing Fe or an Fe alloy.

Next, heat treatment conditions for forming the color group realization oxide film layer 20 corresponding to the color group to be implemented in the heat treatment condition setting step S20 are set.

The heat treatment conditions described above may be set among conditions performed for 20 minutes to 60 minutes at a temperature of 150° C. to 350° C. in a nitrogen or atmospheric atmosphere.

The power of the femtosecond laser for forming the LIPSS described above, the scan irradiation rate, and the heat treatment condition may be set as a database for each color included in the color group, and then selected and set in a process process for expressing a desired color.

Thereafter, in the color realization step (S30), a color group realization oxide film layer 20 is formed on the surface of the LIPSS 11 by performing heat treatment according to the set heat treatment condition to implement a desired color group.

As described above, the surface of the metal member on which the LIPSS 10 and the color group-implementing oxide layer 20 are formed express different colors included in the color group according to the viewing angle and the intersection angle.

Here, the viewing angle is an elevation angle looking at the surface of the metal plate and is an angle between 0°C and 90°C, and the crossing angle (azimuth angle) is the same plane of the field of view as the unit patterns constituting the laser-induced periodic surface structure 11 It may have a value of 0°C to 180°C (180°C d to 360°C is the same color range) as the angle between.

Accordingly, in the step of imparting the surface refractive index (S40), in order to express a specific color among color groups having colors that are differently expressed according to the viewing angle and the crossing angle, corresponding to a specific viewing angle and crossing angle. A transparent polymer layer 30 having a refractive index of is formed on the oxide layer 20 for implementing a color group. Accordingly, the color of the viewing angle and the cross-angle direction corresponding to the refractive index of the transparent polymer layer 30 is expressed on the entire surface of the metal member 10 regardless of the viewing angle and cross-angle.

As described above, the present invention forms the LIPSS 11 having a pattern corresponding to the color group to be implemented on the surface of the metal member 10, and implements a color group by performing a heat treatment process that has a short process time and is easy to control. By forming the oxide film layer 20, color reproducibility is high and the color realization process can be continuously implemented, thereby enabling the mass production of the surface color group realization metal plate 1 with high color reproducibility.

<Experimental Example>

-Fabrication of metal plates that implement surface color groups

Pure copper plate (Pure Cu), 2.5mm/s(a), 5mm/s(b), and 10mm/s(c) scan and irradiate a femtosecond laser with a power of 1Kw to form LIPSS and then heat treatment is not performed. After forming LIPSS by scanning and irradiating a femtosecond laser having a power of 1Kw at 2.5mm/s(a), 5mm/s(b), and 10mm/s(c) of uncoated copper plates, heat treatment was performed at 200℃ for 20 minutes. After forming the LIPSS by scanning and irradiating the performed copper plate and a femtosecond laser having a power of 1Kw at 2.5mm/s(a), 5mm/s(b) and 10mm/s(c), heat treatment at 200℃ for 60 minutes Was carried out to fabricate copper plate materials having an oxide film layer formed thereon.

- analysis

4 is a graph showing changes in the brightness of a metal surface according to heat treatment conditions of a metal plate of an experimental example.

As shown in FIG. 4, in the pure copper plate and the copper plate on which the LIPSS was formed, the brightness of the copper plate without heat treatment was the brightest, and as the heat treatment time increased, the brightness decreased and became dark.

5 is a graph showing changes in brightness of a metal surface according to heat treatment conditions of a metal plate of an experimental example.

The color realization performance of FIG. 5 was measured using L*, a*, and b* at a viewing angle of 90° in the CIE color coordinate system. For reference, in the CIE color coordinate system, L* represents the change in brightness, a* represents the red color (R) on the (+) side, and the green (G) on the (-) side gets stronger, and the b* is (+) On the) side, yellow (Y) gets stronger and on the (-) side, blue (B) gets stronger.

As can be seen from FIG. 5, in the case of a copper plate (Non haeat treatment) in which LIPSS was not subjected to heat treatment, (a*, b*) was about (-22, -8), and green and blue were strong. And in the case of the copper plate (20min) that was heat treated for 20 minutes after the LIPSS was formed, (a*, b*) was about (-16, +1), and the green color was strong, and after the LIPSS was formed, the heat treatment was performed for 60 minutes. In the case of the copper plate (60min) that was performed, (a*, b*) was about (-9, 7), showing weak green and weak blue. That is, it can be seen from FIG. 5 that different color groups are implemented when the heat treatment time is different after forming the LIPSS on the copper plate.

6 is a view showing the color change according to the viewing angle and the crossing angle of a pure copper plate without LIPSS formed, Figure 7 is 2.5mm / s (a), 5mm / s (b) and 6mm / s (c) It is a diagram showing the color change according to the viewing angle and the crossing angle of the copper plate without heat treatment after forming the LIPSS by scanning and irradiating the femtosecond laser, Figure 8 is 2.5mm / s (a), 5mm / s (b) and It is a view showing the color change according to the viewing angle and crossing angle of the copper plate without heat treatment after forming LIPSS by scanning and irradiating a femtosecond laser at 6mm/s(c), and FIG. 9 is 2.5mm/s(a), After forming LIPSS by scanning and irradiating femtosecond lasers at 5mm/s(b) and 6mm/s(c), heat treatment was performed at 200℃ for 60 minutes to realize color group. The viewing angle and crossing angle of the copper plate with the oxide layer It is a diagram showing the color change accordingly.

In Figures 7 to 9 (a), (b) and (c), the femtosecond laser was scanned at 2.5mm/s, 5mm/s and 10mm/s, respectively, to form LIPSS and then heat-treated copper plate materials. Represents a group of colors to be displayed.

As can be seen from FIG. 6, it was confirmed that even in the case of a pure copper plate, only a change in brightness was displayed according to the viewing angle.

However, as shown in FIGS. 7 to 9, when heat treatment is performed after forming LIPSS on the surface, it can be seen that various colors are implemented according to LIPSS formation conditions and heat treatment conditions. That is, it was confirmed that various colors were implemented according to the scan irradiation speed and heat treatment conditions of the femtosecond laser when forming the color group realization oxide film layer on the surface of a metal plate material as a metal member. In addition, these colors vary according to the viewing angle, which is the angle of the line of sight looking at the metal plate 1, and the cross angle in the horizontal plane between the line on the horizontal plane of the line of sight and the longitudinal axis of the unit pattern constituting the laser-guided periodic surface structure. It was confirmed that it represents.

Accordingly, when a transparent polymer layer 30 having a refraction corresponding to a color expressed in correspondence with each viewing angle among colors included in the color group is formed on the surface of the color group-implemented oxide layer 20, the metal plate 1 It was confirmed that a specific color corresponding to the viewing angle can be implemented over the entire surface of ).

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the technical field to which the present invention pertains will be able to understand that it is possible to easily transform it into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later, and all changes or modified forms derived from the meaning and scope of the claims and the concept of equivalents thereof should be construed as being included in the scope of the present invention.

1: metal plate
10: metal member
11: LIPSS
20: color group realization oxide layer
21: heater
30: transparent polymer layer

Claims (16)

Forming a laser induced periodic surface structure (LIPSS) on the surface of the metal member using a laser;
A heat treatment condition setting step of setting a heat treatment condition for the metal member on which the laser-induced periodic surface structure is formed for realizing a desired color group; And
Including; a step of implementing a desired color group of implementing a color of a desired color group by forming a color group realization oxide film layer on the upper surface of the laser-induced periodic surface structure of the metal member by performing heat treatment under the set heat treatment condition; and
In this case, the laser is a femtosecond laser,
In the forming of the laser-induced periodic surface structure, the laser-induced periodic surface structure is formed by controlling the scanning irradiation speed of the femtosecond laser so as to have a pattern expressing a preset color. How to implement color. delete delete The method of claim 1, wherein the metal constituting the metal member,
Metal surface color implementation method using a heat treatment, characterized in that any one of non-ferrous metal or ferrous metal. The method of claim 4, wherein the non-ferrous metal is
Cu, Zn, Au, Ag, Al, Ti, W, Ni, Mo, Co, Mg, or a metal surface color implementation method using a heat treatment, characterized in that at least one selected from the group containing these alloys. The method of claim 4, wherein the iron-based metal,
Metal surface color implementation method using heat treatment, characterized in that at least one selected from the group containing Fe or Fe alloy. The method of claim 1, wherein the heat treatment condition is
A method of implementing color of a metal surface using heat treatment, characterized in that it is set among conditions performed for 20 to 60 minutes at a temperature of 150°C to 350°C. The method of claim 1,
After the step of implementing the color of the desired color group, the expression of a specific color among the colors included in the desired color group is expressed according to a viewing angle and an intersection angle of a field of view with a unit pattern forming the laser-induced periodic surface structure. For example, a method for implementing a color of a metal surface using a heat treatment, further comprising: forming a transparent polymer layer having a refractive index corresponding to a specific viewing angle and an intersection angle on top of the color group-implementing oxide layer. Metal member;
A laser induced periodic surface structure (LIPSS) formed on the metal member; And
And a color group realization oxide film layer formed on top of the laser-induced periodic surface structure by performing a heat treatment process according to a heat treatment condition corresponding to the realization of a desired color group, and
In this case, the laser is a femtosecond laser,
The laser-induced periodic surface structure is formed by controlling the scanning irradiation speed of the femtosecond laser so as to have a pattern expressing a preset color. delete delete The method of claim 9, wherein the metal constituting the metal member,
A metal plate material with surface color, characterized in that it is any one of a non-ferrous metal or a ferrous metal. The method of claim 12, wherein the non-ferrous metal,
Cu, Zn, Au, Ag, Al, Ti, W, Ni, Mo, Co, Mg, or a metal plate having a surface color, characterized in that at least one selected from the group containing an alloy thereof. The method of claim 12, wherein the iron-based metal,
Metal plate material with surface color, characterized in that at least one selected from the group containing Fe or Fe alloy. The method of claim 9, wherein the heat treatment conditions,
A metal plate material having a surface color, characterized in that it is set among conditions performed for 20 to 60 minutes at a temperature of 150°C to 350°C. The method of claim 9, wherein the metal plate,
The refractive index is adjusted to express a specific color among the colors included in the desired color group expressed according to the angle of view on the top of the color group realization oxide layer and the cross angle of the field of view with the unit pattern forming the laser-induced periodic surface structure A metal plate material having a surface color, characterized in that it further comprises a transparent polymer layer.

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