KR20220089034A - Metal for bonding with increased surface area, composite, and manufacturing method thereof - Google Patents

Abstract

A bonding metal having an increased surface area is disclosed. In the bonding metal with increased surface area according to an embodiment of the present invention, a molten concave portion formed by melting the metal surface by nanosecond pulse laser irradiation and the metal molten by the nanosecond pulse laser irradiation are adsorbed to the metal surface and an adsorption convex portion formed by being formed, wherein a protruding length of the adsorption convex portion is longer than a width direction length of the molten concave portion.

Description

Metal for bonding with increased surface area, composite molded article, and manufacturing method thereof

The present invention relates to a bonding metal having an increased surface area, a composite molding, and a method for manufacturing the same, and more particularly, to a bonding metal having an increased surface area using a nanosecond laser to increase the surface area of the metal, a composite molding, and a method for manufacturing the same is about

Recently, with the development of transportation means such as automobiles and aviation, a technology for a composite molded body in which a metal-polymer material is combined is being developed.

In general, a composite molding is formed by bonding a metal and a non-metal through physical or chemical bonding, and when bonding between a metal and a non-metal, the bonding strength changes depending on the roughness of the surface and the shape of the surface.

Conventionally, in order to increase the bonding force between a metal and a non-metal polymer material, an attempt has been made to improve the bonding strength by giving roughness to the surface of a metal or polymer material by a method such as shot blasting.

In addition, there have been attempts to improve the bonding strength by forming a porous surface or a rough surface using the wet method, but the surface roughness control using the wet method uses a substance harmful to the human body, and there are problems such as a decrease in the uniformity of the surface roughness is generated

In addition, since a stable oxide film is formed on the surface of metals such as Ti and Al, the bonding strength is lowered. Accordingly, it is required to develop a technology that can improve bonding strength by removing the oxide film on the metal surface and increasing the surface area at the same time.

An object of the present invention is to provide a metal for bonding, a composite molded article, and a method for manufacturing the same, in which the surface area of the metal is increased by using a nanosecond laser.

As a means for achieving the above object, the present specification provides a melting concave portion formed by melting a metal surface by nanosecond pulsed laser irradiation; and an adsorption convex portion formed by adsorbing molten metal to the metal surface by the nanosecond pulse laser irradiation, wherein the protruding length of the adsorption convex portion is longer than the width direction length of the molten concave portion. Disclosed is a metal for joining.

In addition, a surface concave portion formed between the adsorption convex portion and the adjacent adsorption convex portion may be included, and a protruding length of the adsorption convex portion may be longer than a width direction length of the surface concave portion.

In addition, a horizontal distance between the molten concavity and the adjacent fusion concavity may be in a range of 10 μm to 2000 μm.

In addition, a vertical distance between the melting concave portion and the adsorption convex portion may be 10 to 100 μm.

In addition, the molten concave portion may be formed on the surface of the metal from which the oxide film has been removed by the nanosecond pulse laser irradiation.

In addition, the fusion concave portion and the adsorption convex portion may form a first pattern portion and a second pattern portion formed to be shifted from the first pattern portion, and the second pattern portion may be formed along an edge of the metal.

As a means for achieving the above object, the present specification discloses a composite molded article formed by coating a polymer material on a metal surface on which a molten concave portion and an adsorption convex portion are formed.

As a means for achieving the above object, the present specification is a nanosecond pulse laser that removes the oxide film on the metal surface selected from the group of Ti, Al, Fe, Mg and Cu, and forms a fusion concave portion and an adsorption convex portion on the metal surface. investigation stage; a pattern forming step of continuously forming a fusion concave portion and an adsorption convex portion formed through the nanosecond pulse laser irradiation step to form a pattern portion; Disclosed is a method of manufacturing a composite molded body comprising; a polymer material application step of applying a polymer material to the metal surface on which the pattern part is formed through the pattern forming step.

In addition, the nanosecond pulse laser irradiation step may be performed under the conditions of using a nanosecond pulse laser of a pulse width: 30 ns, a speed: 100 mm/s to 2000 mm/s, an output: 20 W or less, and a beam size: 30 to 40 μm.

In addition, the pattern forming step may include a first pattern forming step and a second pattern forming step, wherein the first pattern and the second pattern are formed to be shifted from each other, and the second pattern may be formed along a metal edge. .

Since the bonding metal with increased surface area according to an embodiment of the present invention forms a fusion concave portion and an adsorption convex portion on the metal surface by nanosecond pulse laser irradiation, it is possible to increase the surface area as well as to increase the surface area of the material joined through the adsorption convex portion. Since separation is prevented, the bonding strength can be greatly improved.

1 is a diagram schematically showing the surface of the metal treated by the nanosecond pulsed laser irradiation of the present invention.
2 to 4 are diagrams showing patterns formed on the metal surface by the molten concave portion and the adsorption convex portion of the present invention.
5 is a view showing an example of a composite molded body according to the present invention.
6 is a photograph of observing a cross-section of a bonding metal having an increased surface area by irradiation with a nanosecond pulsed laser of the present invention.
7 is a photograph of observing the surface of the bonding metal having an increased surface area by the nanosecond pulsed laser irradiation of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes preferred embodiments of the present invention. However, the embodiment of the present invention may be modified in various other forms, and the technical idea of the present invention is not limited to the embodiment described below. In addition, the embodiments of the present invention are provided in order to more completely explain the present invention to those of ordinary skill in the art.

The terms used in this application are only used to describe specific examples. Therefore, for example, a singular expression includes a plural expression unless the context clearly requires it to be singular. In addition, as used in this application, terms such as "comprises" or "includes" are used to clearly indicate that the features, steps, functions, components, or combinations thereof described in the specification exist, and other features It should be noted that the use is not intended to preliminarily exclude the existence of elements, steps, functions, components, or combinations thereof.

On the other hand, unless otherwise defined, all terms used herein should be regarded as having the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Accordingly, unless explicitly defined herein, specific terms should not be construed in an unduly idealistic or formal sense. For example, a singular expression herein includes a plural expression unless the context clearly dictates otherwise.

In addition, in this specification, "about", "substantially", etc. are used in or close to the numerical value when manufacturing and material tolerances inherent in the stated meaning are presented, and are used in a precise sense to help the understanding of the present invention. or absolute figures are used to prevent unreasonable use by unconscionable infringers of the mentioned disclosure.

Hereinafter, a bonding metal having an increased surface area according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 .

Referring to FIG. 1 , the bonding metal having an increased surface area according to the present invention includes a fusion concave portion 112 and an adsorption convex portion 113 formed on the surface 111 of the metal 110 by nanosecond pulse laser irradiation. do.

The melting concave portion 112 is formed by melting the metal surface 111 by nanosecond pulse laser irradiation, and is formed to have a predetermined depth. The molten concave portion 112 may be continuously formed, and the horizontal distance D1 between the molten concave portion 112 and the adjacent molten concave portion 112 may be 10 μm to 2000 μm. When the horizontal distance D1 between the molten concavity 112 and the neighboring molten concavity 112 is 10 μm to 2000 μm, a fine pattern can be formed on the metal surface 111, through which the metal ( 110) by preventing leakage of the polymer material applied to the surface, as well as reducing the manufacturing cost, it is possible to prevent the separation of the polymer material applied on the metal surface 111, it is possible to improve the bonding strength. Here, the molten concave portion 112 refers to a region having a lower height than the metal surface 111 , that is, a region in which the metal surface 111 is melted by nanosecond pulse laser irradiation and a groove is formed. The molten concave portion 112 may be directly formed on the metal surface 111 from which the oxide film F has been removed by nanosecond pulse laser irradiation.

The adsorption convex portion 113 is formed by adsorbing molten metal to the metal surface 111 by nanosecond pulse laser irradiation. The adsorption convex portion 113 may be formed through a burr in which a portion of the metal removed from the metal surface 111 by nanosecond pulse laser irradiation is adsorbed and stacked on a nearby portion thereof. Here, the adsorption convex portion 113 means a region higher than the metal surface 111 , that is, a region protruding from the metal surface 111 by nanosecond pulse laser irradiation.

The protruding length L of the adsorption convex portion 113 may be longer than the width direction length W1 of the molten concave portion 112 . When the protruding length L of the adsorption convex portion 113 is longer than the width direction length W1 of the molten concave portion 112 , the surface area of the metal 110 can be increased to a greater extent, and the bonding strength of the polymer material can improve Here, the width direction length W1 of the fusion concave portion 112 means the length of the maximum width among the width lengths of the fusion concave portion 112 .

In addition, the bonding metal having an increased surface area according to the present invention may include a surface concave portion 114 formed between the adsorption convex portion 113 and the adjacent adsorption convex portion 113 . The surface concave portion 114 prevents the surface area of the metal 110 from being reduced by bonding the adsorption convex portion 113 and the adjacent adsorption convex portion 113 to each other during nanosecond pulse laser irradiation. Here, the width direction length W2 of the surface concave portion 114 means the length of the maximum width among the width lengths of the surface concave portion 114 .

In addition, the vertical distance D2 between the melting concave portion 112 and the adsorption convex portion 113 may be 10 to 100 μm. The vertical distance D2 refers to a vertical distance between the trough of the melting concave portion 112 and the ridge of the adsorption convex portion 113 , that is, the depth.

2 to 4 , the molten concave portion 112 and the adsorption convex portion 113 of the bonding metal having an increased surface area according to the present invention may form the pattern portion 120 . The pattern part 120 guides the movement of the incoming polymer material, and a plurality of fusion concave parts 112 and adsorption convex parts 113 may be continuously formed.

In the case of the metal 110, the wettability characteristics change according to the surface roughness, and in the present invention, hydrophilicity/hydrophobicity can be controlled by changing the surface patterning shape. That is, patterning can be performed on the surface by using a laser at regular intervals in the horizontal and vertical directions with a certain rule on the surface. The surface patterning operation can be made by adjusting the spacing and the depth of the pattern by using the optical system of the pulsed laser, and the generated pattern can have a free shape such as a triangle, a square, and a hexagon on the surface. That is, according to the scanning direction of the laser, the shape of the grid can be controlled to be a triangle, a rectangle, a hexagon, etc., and the depth and shape of the unevenness can be changed according to the exposure time of the laser.

The pattern unit 120 may include a first pattern unit 121 and a second pattern unit 122 . The second pattern part 122 may be formed to be shifted from the first pattern part 121 , and the second pattern part 122 may be formed along the edge of the metal 110 .

The first pattern part 121 may be formed in a direction parallel to the inflow direction (E) of the polymer material, and the second pattern part 122 is formed of the metal 110 in a direction shifted from the inflow direction (E) of the polymer material. It may be formed along the edge. In addition, the second pattern portion 122 may be formed in a direction shifted from the inflow direction E of the polymer material, provided in an X-shape, and formed along the edge of the metal 110 . In this case, it is possible to quickly introduce the polymer material in the initial stage of application, and at the same time prevent leakage of the introduced polymer material. it can be prevented

The bonding metal with increased surface area according to an embodiment of the present invention may be made of a metal 110 selected from the group consisting of Ti, Al, Fe, Mg and Cu, and preferably a stable oxide film on the metal surface 111 . (F) may be formed of a metal 110 selected from Ti and Al.

Referring to FIG. 5 , the composite molded body according to an embodiment of the present invention has a polymer on the surface 111 of the metal 110 on which the pattern part 120 composed of the melting concave part 112 and the adsorption convex part 113 is formed. The material 130 may be applied and formed.

The composite molded body may be formed by coating the polymer material 130 on the metal surface 111 on which the pattern part 120 is formed, and as shown in FIG. 5 , the polymer material 130 is applied between the plurality of metal surfaces 111 . can be formed. In addition, the composite molded body may be formed by bonding between metals of the same type such as Ti, Al, Fe, Mg, and Cu, and may be formed by inserting a metal between a metal and a non-metal of Ti, Al, Fe, Mg, and Cu. .

Hereinafter, a method for manufacturing a composite molded body according to the present invention will be described.

A method for manufacturing a composite molded body according to an embodiment of the present invention includes a nanosecond pulsed laser irradiation step, a pattern forming step, and a polymer material application step.

The nanosecond pulse laser irradiation step removes the oxide film (F) of the metal surface 111 selected from the group of Ti, Al, Fe, Mg and Cu, and melts concave portions 112 and adsorption convex portions on the metal surface 111 . (113) is formed.

The nanosecond pulse laser irradiation step may be performed under conditions of using a nanosecond pulse laser of a pulse width: 30 ns, a speed: 100 mm/s to 2000 mm/s, an output: 20 W or less, and a beam size: 30 to 40 μm.

When nanosecond pulsed laser is used, surface treatment is possible at high speed compared to picosecond and femtosecond pulsed lasers, and while removing the oxide film (F) on the metal surface 111, the intaglio melting concavity 112 and the embossing are adsorbed. The convex portion 113 may be formed.

6 and 7 , an intaglio melting concave portion 112 and an embossing adsorption convex portion 113 are formed on the surface 111 of Ti from which the oxide film F has been removed through the nanosecond pulse laser irradiation step. can be confirmed, and it can be confirmed that the protruding length L of the adsorption convex portion 113 is longer than the width direction lengths W1 and W2 of the melting concave portion 112 and the surface concave portion 114 .

In the pattern forming step, the pattern portion 120 is formed by continuously forming the melting concave portion 112 and the adsorption convex portion 113 formed through the nanosecond pulse laser irradiation step. The pattern forming step may include a first pattern forming step and a second pattern forming step, wherein the first pattern and the second pattern are formed to be shifted from each other, and the second pattern may be formed along the edge of the metal.

In the polymer material application step, the polymer material 130 is applied to the metal surface on which the pattern part 120 is formed through the pattern forming step. The polymer material application step may be performed by adsorbing or injecting the polymer material 130 onto the metal surface 111 on which the pattern part 120 is formed. In the step of applying the polymer material, the polymer material 130 may be introduced from one direction of the metal side or the polymer material 130 may be introduced from the upper portion of the metal surface 111 toward the metal surface 111 .

In the above description, exemplary embodiments of the present invention have been described, but the present invention is not limited thereto, and those of ordinary skill in the art will not depart from the concept and scope of the following claims. It will be appreciated that various modifications and variations are possible.

Claims (10)

a fusion recess formed by melting a metal surface by nanosecond pulsed laser irradiation; and
and an adsorption convex portion formed by adsorbing the metal molten by the nanosecond pulse laser irradiation to the metal surface;
The protruding length of the adsorption convex portion is longer than the width direction length of the molten concave portion. According to claim 1,
and a surface concave portion formed between the adsorption convex portion and a neighboring adsorption convex portion, wherein a protruding length of the adsorption convex portion is longer than a width direction length of the surface concave portion. According to claim 1,
The horizontal distance between the molten concavity and the adjacent molten concavity is 10 µm to 2000 µm, and the surface area of the joining metal is increased. According to claim 1,
A metal for joining with an increased surface area, the vertical distance between the molten concave portion and the adsorption convex portion being 10 to 100 μm. According to claim 1,
The molten concave portion is formed on the surface of the metal from which the oxide film has been removed by irradiation with the nanosecond pulsed laser, and has an increased surface area for joining metal. According to claim 1,
The fusion concave portion and the adsorption convex portion form a first pattern portion and a second pattern portion formed to be displaced from the first pattern portion, and the second pattern portion is formed along an edge of the metal for bonding with an increased surface area. 7. The method according to any one of claims 1 to 6,
A composite molded article formed by coating a polymer material on the surface of the metal on which the fusion concave portion and the adsorption convex portion are formed. A nanosecond pulse laser irradiation step of removing the oxide film on the surface of a metal selected from the group consisting of Ti, Al, Fe, Mg and Cu, and forming a fusion concave portion and an adsorption convex portion on the metal surface;
a pattern forming step of continuously forming a molten concave portion and an adsorption convex portion formed through the nanosecond pulsed laser irradiation step to form a pattern portion;
A method of manufacturing a composite molded body comprising a; a polymer material application step of applying a polymer material to the metal surface on which the pattern part is formed through the pattern forming step. 9. The method of claim 8,
The nanosecond pulsed laser irradiation step is a method of manufacturing a composite molded body in which a pulse width: 30ns, speed: 100mm/s to 2000mm/s, output: 20W or less, beam size: 30 to 40㎛ using a nanosecond pulse laser. 9. The method of claim 8,
The pattern forming step includes a first pattern forming step and a second pattern forming step, wherein the first pattern and the second pattern are formed to be shifted from each other, and the second pattern is formed along the edge of the metal. Way.

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