WO2016060379A1

WO2016060379A1 - Metal foam and powder composite laminate structure

Info

Publication number: WO2016060379A1
Application number: PCT/KR2015/009372
Authority: WO
Inventors: 최성환; 박만호
Original assignee: 주식회사 알란텀
Priority date: 2014-10-17
Filing date: 2015-09-04
Publication date: 2016-04-21

Abstract

A metal composite laminate structure is provided. A metal composite laminate structure according to one embodiment of the present invention comprises: a metal foam layer comprising a plurality of open cells; and a metal powder layer positioned on the metal foam layer, coming into contact with the upper surface of the metal foam layer, and comprising a metal powder, wherein the metal powder is distributed from the upper surface of the metal foam layer to the lower part thereof and is filled in at least a part of the open cells positioned inside of the metal foam layer, and the contact surface of the metal foam layer and the metal powder layer can have irregular flexure.

Description

【Specification】

[Name of invention]

Composite laminate structure of metal sore and powder

Technical Field

A metal composite laminate structure is provided.

Background Art

In general, metal foam refers to a porous metal having many bubbles in the metal material.

Such metal products are classified into an open cel l type or a closed cel l type according to the shape of bubbles contained therein. Open cells exist in a shape where the bubbles are interconnected to facilitate passage of gas or fluid along the bubbles. On the other hand, in closed cells, bubbles are not connected to each other and exist independently, so that gas or fluid cannot be easily passed.

In the case of a metal product having an open cell, its structure is similar to that of a human body, and its structure is stable. The surface area per unit volume can be used for various purposes due to its physical characteristics such as extremely large and light weight.

Such metal products are used in various industrial fields such as battery electrodes, fuel cell parts, filters for soot filtration devices, pollution control devices, catalyst supports, and audio parts.

Particularly, in the case of a metal product including an open cell, it may be easy to internally fill powder particles, and thus may be applied to various fields.

[Detailed Description of the Invention]

[Technical problem]

One embodiment of the present invention is to provide a metal composite laminate structure having improved durability, thin thickness, and excellent gas flow rate.

In addition to the above object, embodiments according to the present invention can be applied to achieve other objects not specifically mentioned.

Technical Solution

In one embodiment of the present invention, a metal foam layer comprising a plurality of open sals, and positioned over the metal article layer, in contact with the upper surface of the metal article layer, A metal powder layer comprising powder, the metal powder being distributed from the top surface to the bottom of the metal part layer, filled in at least a portion of an open cell located inside the metal part layer, The contact surface of the metal powder layer provides a metal composite laminate structure with irregular bends.

The metal part layer may include a plurality of open cells having an irregular branch shape. ᅳ

The metal composite laminate structure may include a plurality of interconnected pores filled with at least a portion of the open sal in which the metal powder is located inside the metal part layer, through which gas may pass.

The average size of the pores may be about 0.2 to 10.0 micrometers.

The average diameter of the plurality of open cells may be about 200 to 3000 micrometers.

The metal composite laminate structure may have a porosity of about 10 to 80%.

The average particle size of the metal powder may be about 1 to 72 micrometers.

When pressure is applied in the thickness direction of the metal composite laminate structure to pass the gas, the ratio of the gas flow rate (L / min) per time (min) may be about 0.5 to 1.5. The thickness of the metal powder layer may be about 0.05 to 5 microns.

The thickness of the metal composite laminate structure may be about 5 to 10 mm.

The metal foam may comprise at least one of Ni, NiCr alloy, NiCrAl alloy, NiFeCrAl alloy, CoNi alloy, or CuMn alloy.

【Effects of the Invention】

The composite laminate structure of metal and powder according to an embodiment of the present invention has micropores, is thin, and may exhibit excellent gas flow rate in the thickness direction.

[Brief Description of Drawings]

1 is an optical microscope photograph of a cross section of a metal composite laminate structure prepared in Example 1 at about 50 times magnification.

2a to 2c are SEM images of the surface of the metal powder layer according to Example 1 at magnifications of 500, 1000, and 2000, respectively.

3A to 3C are views of the metal composite laminate structure prepared in Example 1 SEM images were taken at 200 magnifications, at 1000 magnifications of the cross section of the metal powder layer, and at 1000 magnifications around the boundary between the metal powder layer and the metal product layer.

Figure 4 is a schematic diagram showing the appearance and the metal composite laminate structure manufactured according to an embodiment of the present invention.

5 is a step-by-step diagram illustrating a method of manufacturing a metal composite laminate structure according to an embodiment of the present invention.

Figure 6 is a graph showing the gas flow rate with time and gas pressure change measured in accordance with the experimental example of the present invention.

FIG. 7 is a graph showing a distribution ratio per pore size in a metal composite laminate structure using gas flow rate data measured in an experimental example of the present invention.

8 is a graph showing the average distribution of the average pore size of the metal composite laminate structure according to an embodiment of the present invention.

[Form to carry out invention]

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily practice the present invention.

The invention may be embodied in many different forms and the embodiments described ^herein: not limited. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and in the case of well-known technology, a detailed description thereof is omitted.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. When a part of a layer, film, region, plate, etc. is said "on" another part, this includes not only the other part "directly" but also another part in the middle. On the other hand, when a part is "just above" another part, there is no other part in the middle. Conversely, when a part such as a layer, film, area, or plate is "below" another part, this includes not only the other part "below" but also another part in the middle. When a part is "just below" another part, there is no other part in the middle.

Throughout the specification, when a part is said to "include" a component, Unless otherwise stated, it means that the other spherical elements may be included, but may further include other components.

Hereinafter, an embodiment of the present invention will be described in detail. However, this is presented as an example, by which the present invention is not limited and the present invention is defined only by the scope of the claims to be described later.

1 is an optical microscope photograph of a cross section of a metal composite laminate structure according to an embodiment of the present invention at a magnification of about 50. FIG.

Referring to FIG. 1, in an embodiment of the present invention, a metal part layer including a plurality of open cells, and a metal powder layer positioned on the metal part layer, in contact with the upper surface of the metal foam layer, and including a metal powder It provides a metal composite locust structure comprising. ^'

The metal product may include at least one of Ni, NiCr alloy, NiCrAl alloy, NiFeCrAl alloy, CoNi alloy, or CuMn alloy. The shape of the metal article may be in the form of a sheet, but is not limited thereto. The plurality of open cells of the metal foam may have a branch shape.

In addition, the metal powder is distributed from the top surface to the bottom of the metal part layer, filled in at least a portion of the open cell located inside the metal foam layer, the contact surface of the metal part layer and the metal powder layer is irregularly curved Can have The metal powder may include at least one of Ni, NiCr alloy, NiCrAl alloy, NiFeCrAl alloy, CoNi alloy, or CuMn alloy.

The metal article layer may comprise a plurality of open cells having an irregular branch shape.

The metal composite laminate structure may include a plurality of minute pores in which metal powder is layered in at least a portion of an open cell in which the metal powder is located inside the metal part layer.

The average size of the plurality of pores may be about 0.2 to 10.0 micrometers. Within this range, it is possible to maintain uniform flowability of the gas and to mix the gas.

The average diameter of the plurality of open sal may be about 200 to 3000 micrometers. Within at least a portion of the plurality of open cells within the average diameter range The layered metal powder can be properly infiltrated inside and uniformly filled.

The metal composite laminate structure may have a porosity of about 10 to 80%. Within the porosity range, the fluid may be constantly transmitted in the thickness direction, and thus may be easily applied to various technical fields.

The average particle size of the metal powder may be about 1 to 72 micrometers. Within the above average diameter range, the metal powder may be properly infiltrated into at least a portion of the inside of the plurality of open cells and uniformly layered.

When pressure is applied in the thickness direction of the metal composite laminate structure to pass the gas, the ratio of the gas flow rate (L / min) per time (min) may be about 0.5 to 1.5. Within the above range, the metal powder layer thickness is 0.05mm, the metal composite laminate structure thickness is 0.5 隱, the ratio of gas flow rate per hour is about 0.5, the metal powder layer thickness

The ratio of gas flow rate per hour is about 5 隱 and the thickness of the metal composite laminate is 10 隱.

1.5, and thus the gas flow rate can be easily controlled through the change of the metal powder layer and the metal part thickness.

Figure 4 is a schematic diagram showing the state of the metal composite laminate structure manufactured according to an embodiment of the present invention, Figure 5 is a step-by-step illustration of the manufacturing method of the metal composite laminate structure according to an embodiment of the present invention.

Referring to Figure 5, the metal composite laminate structure according to an embodiment of the present invention uniformly applying a solution containing a metal powder and a binder on a support (S1), comprising a metal powder and a binder coated on a support Positioning the metal foam on the solution layer (S2), applying a pressure to the upper part of the metal (S3), and sintering step (S4) through the heat treatment may be included.

Hereinafter, a method of manufacturing a metal composite laminate structure according to an embodiment of the present invention will be described in detail for each step.

First, uniformly coating a solution including a metal powder and a binder on a support (S1) is a step of applying a mixed solution including the metal powder and a binder onto the support to have a uniform thickness. In this case, the coating may be tape casting or slurry coating. In addition, the support may be, for example, in the form of a tray.

Next, a solution layer comprising a metal powder and a binder coated on the support Positioning the metal article (S2) is a step of forming a laminated structure between the metal layer and the solution layer having a predetermined thickness.

Next, the step (S3) of applying a pressure on the upper part of the metal product can improve the adhesion between the solution layer and the metal foam and mutual adhesion. In addition, through this step (S3), the metal powder is distributed from the upper surface to the lower part of the metal part layer and is layered on at least a part of the open cell located inside the metal foam layer. The pressure is applied in the thickness direction of the laminated structure so that the metal powder easily penetrates into the plurality of open cells inside the metal foam layer and at least a part thereof is layered. In this case, the application of pressure may be applied at a uniform pressure using a loading member.

Next, the sintering step S4 through heat treatment is a step of heating the metal powder and the metal powder layer to maintain a more stable bond with the metal product layer. Hereinafter, the present invention will be described in more detail with reference to Examples, but the following Examples are only examples of the present invention, and the present invention is not limited to the following Examples.

Example 1 Fabrication of Metal Laminated Structure

First, a solution containing Ni metal powder and a binder is applied on a tray with a uniform thickness. At this time, the average thickness of the solution layer applied on the tray is about 0.5 mm. Next, a Ni metal article sheet having a thickness of about 140 microns and a length of about 140 mm is laminated on the solution layer at a thickness of about 450 micrometers. Next, a loading member is placed on top of the laminated metal foam sheet, and is pressed in the vertical direction of the laminated surface using the hydraulic press at a pressure of about lOkgf using a hydraulic press. Next, the loading member and the pressure are removed, and the metal laminate and the layer of the solution layer are laminated on the structure for about 1 hour at about 1100 silver to prepare a metal composite laminate.

1 is an optical microscope photograph taken at about 50 times the cross section of a metal composite laminate structure fabricated in Example 1. FIG.

_Referring to FIG. 1, it can be seen that the metal powder, which appears in gold, forms a thin film on the surface of the metal product layer, and the metal powder is layered inside the metal product layer in the? In addition, the cross section of the metal foam layer itself is golden and appears as a branch, which is a plurality of open types in the metal part. The interface of the cell is shown.

2A to 2C are SEM images of the surface of the metal powder layer according to Example 1 at magnifications of 500, 1000, and 2000, respectively. 2A to 2C, the metal powders are connected to each other with irregular pores. 3A to 3C are photographed at 200 magnifications of the cut surface of the metal composite laminate structure prepared in Example 1, at 1000 magnifications of the cross section of the metal powder layer, and at 1000 magnifications of the vicinity of the boundary between the metal powder filling and the metal product layer. One SEM picture.

In FIG. 1 to FIG. 3, the black portions represent empty spaces.

Experimental Example Measurement of flow rate and pore size

In order to determine the gas permeability and pore size of the metal composite laminate structure prepared in Example 1, the following experiment was performed.

Use a capillary f low porometer (PMI, CFP-1200-AEL) to measure high porosity liquids such as Porewick (or SUwick, water) for pore measurements. After inserting the specimen to block the pores, the device is a device for measuring the pore size, distribution and air permeability while gradually reducing the pressure by air pressure, and the results are shown in FIG.

The principle of measuring pore size distribution using an automated capillary flow porometer is as follows. First, to measure the porosity of the specimen, use a fluid with low surface tension and low vapor pressure to completely impregnate the specimen so that all pores are filled with fluid, and then gradually increase the pressure using compressed air. As the compressed air pressure increases, the surface tension at the site with the largest pores inside the specimen exceeds the certain threshold and the compressed air penetrates the fluid. And as the pressure of the compressed air is continuously increased, the compressed air also permeates the fluid contained in the small pores. Compressed air gradually penetrates the fluid contained in all pores. After such a process, the compressed air pressure is increased once again in the state where the fluid is removed to measure the amount and pressure of compressed air according to permeation. The relationship between the amount of compressed air and the pressure measured by the above method may be represented as shown in FIG. 6, and the maximum and minimum average pore size and distribution state may be determined using the same.

6 is a graph showing gas flow rate with time change and gas pressure change. Here, the graph ② is a case where the dry gas is permeated, the graph ① is a case where the wet gas is permeated, and the graph ③ is a graph when the semi-dry gas is permeated. With reference to FIG. 6, the horizontal axis is pressure psi and the vertical axis is f low rate (L / min).

Here, the pore size (diameter) of the metal composite laminate structure was calculated by using the data value of the case where the wet gas was permeated using the PMI's Automated Perm—porometer (graph ① of FIG. 6) and the following calculation formula. It is shown in. Referring to Figure 7, the horizontal axis is the pore diameter (pore di ameter) (/ m), the vertical axis is the pore size The pore size distribution (number). -[Calculation 1]-D = 4y / p

Where D is the pore diameter, p is the differential pressure, and γ is the surface tension of the wetting fluid.

In addition, the same experiment in which the second gas was permeated was repeatedly performed 5 to 10 times, and the pore distribution of the average pore size (diameter) was calculated using the data value and the above equation 1, and is shown in FIG. 8. . Referring to FIG. 8, the horizontal axis is the average pore diameter (// m), and the vertical axis is the pore size distribution (number).

Referring to FIG. 8, it can be seen that most pores of the metal composite laminate structure prepared in Example 1 have a pore size of about 1 or less on average. Through this, it can be indirectly confirmed that the metal powder is uniformly layered inside the metal foam layer.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

[Range of request]

[Claim 1]

A metal foam layer comprising a plurality of open cells, and

A metal powder layer overlying the metal foam layer, in contact with the top surface of the metal article layer, and comprising a metal powder

Including

The metal powder is distributed from the top surface to the bottom of the metal foam layer, is filled in at least a portion of the open cell located inside the metal article layer, the contact surface of the metal article layer and the metal powder layer is Metal composite laminate structure with irregular bends.

[Claim 2]

In claim 1,

And the metal part layer includes a plurality of open cells having an irregular branch shape.

[Claim 3].

In paragraph 2,

The metal composite laminate structure is,

The metal powder is laminated in at least a portion of an open cell located inside the metal part layer, the gas powder comprising a plurality of interconnected pores through which gas can pass;

Metal composite laminate structure wherein the average size of the pores is 0.2 to 10.0 micrometers

[Claim 4]

In paragraph 2,

An average diameter of the plurality of open cells is 200 to 3000 micrometers metal composite laminate structure.

[Claim 5]

In paragraph 2,

The average particle size of the metal powder is 1 to 72 micrometers metal composite laminate structure.

[Claim 6]

In U-port,

The metal composite layer has a thickness of 0.05 to 5 mm in thickness.

[Claim 7]

In paragraph 1,

The metal composite laminate structure thickness of 0.5 to 10 kPa metal composite laminate structure. ^'

[Claim 8]

At that U port,

The metal product is a metal composite laminate structure comprising at least one of Ni, NiCr alloy, NiCrAl alloy, NiFeCrAl alloy, CoNi alloy, or CuMn alloy.