KR20180117256A - Conductive metal-coated Al powder and manufacturing method - Google Patents

Abstract

One aspect of the present invention relates to a conductive metal-coated aluminum powder formed by coating one or more kinds of conductive metals on aluminum powder in a non-electrolytic plating method. At this time, the conductive metal-coated powder has powder characteristics of maximum volume cumulative diameter (D_max) of 70 μm or less in accordance with a laser diffraction scattering particle distribution method, and the conductive metal is one of nickel, copper, gold, silver, palladium, iron, zinc, tin, rhodium, and indium, or an alloy thereof. Moreover, another aspect of the present invention, a method to manufacture a conductive metal-coated aluminum power is advanced through a process of washing a surface of aluminum powder and washing the surface of the aluminum powder with water, a process of roughing the surface and washing the surface with water, a process of forming a zinc-base film on the surface and washing the surface with water, and a step of coating the conductive metal coating on the surface by non-electrolytic plating. Accordingly, in terms of manufacturing or use, one or two or more conductive metals are coated on the aluminum powder by the non-electrolytic plating method, thereby providing an effect of manufacturing the conductive metal-coated powder while pursuing cost reduction by lower cost than that of an existing conductive powder due to use of the aluminum powder, providing the conductive metal-coated aluminum powder with excellent electric conductivity and improved corrosion resistance, and providing a low cost conductive metal-coated aluminum power used for a purpose, such as conductive paste and electromagnetic shield conductive paint using the same.

Description

≪ Desc / Clms Page number 1 > Conductive metal-coated Al powder and manufacturing method &

The present invention relates to a conductive metal powder, and more specifically, by forming one or more conductive metal films by an electroless plating method on an Al powder, it is possible to reduce the cost of the conductive metal powder, To a conductive metal-coated Al powder capable of producing powder, which is excellent in electrical conductivity as well as in corrosion resistance, and a method for producing the same.

In general, as household appliances and electronic appliances become more and more widespread, malfunctions of hospital equipment and aircraft due to malfunction of electronic devices due to electromagnetic wave interference are very serious. Particularly, it is unclear about the human body effect. It is urgent to develop an electromagnetic wave shielding material.

On the other hand, in the assembling process of automobiles and electronic devices, the joining technique of parts is a step of replacing a conventional physical joining technique such as bolts, rivets, and welding, and converting them into chemical joining using heat welding, adhesives, Such bonding technology is becoming more important due to complexity, weight reduction, ease of work, and emotion of appearance. The filter of the electromagnetic shielding coating disperses electromagnetic waves concentrated on one side, thereby absorbing and discharging the electromagnetic waves to be cut off.

Recently, as global warming due to depletion of energy resources and environmental pollution is highlighted as a major issue, continuous attention and research and development are required for transportation equipment, in particular, demand for lightening of automobiles and particle control of exhaust gas. In order to achieve high energy efficiency, low-cost automotive parts manufacturing technology using non-iron powder materials such as aluminum, magnesium, and titanium should be continuously developed based on iron-based parts. In addition, research and development should be carried out to minimize environmental pollution such as fine particle control of exhaust gas and new catalyst technology.

In response to these trends, the production of powder companies related to this trend is also increasing due to the improvement of the global automobile market share of domestic automakers. Particularly, as the annual production of automobiles increases, mass production of parts using existing main forging process is limited, and efforts are being actively made to apply a powder process capable of mass production at a low price. Accordingly, in order to replace casting and forging products, demands for high-strength and high-density powder materials and parts have been rapidly increasing, and research and development has been actively conducted to cope with such demands.

Korean Patent Publication No. 10-1995-0014640 entitled " Conductive material in which a high-conductive metal is plated on a conductive material having a pure metal, an alloy and a compound alone or in the form of a composite powder particle on a surface contact surface "(registered Nov. ) Korean Patent Registration No. 10-1333342 "Method of Forming Metal Powder and Method of Producing Conductive Paste Using the Same" (Date of Registration: November 20, 2013) Korean Patent Laid-Open No. 10-2016-0047915 "Conductive Metal Powder for Electrode Formation, Method for Manufacturing the Same, and Electronic Part Containing the Conductive Metal Powder for Electrode Formation" Korean Patent Laid-Open No. 10-2016-0084402 entitled " Carbon Coated Metal Powder, Conductive Paste Containing Carbon Coated Metal Powder, Laminated Electronic Component Using It, and Method of Making Carbon Coated Metal Powder " 13.)

In order to fundamentally improve the above-described problems, the present invention provides a method of forming a conductive powder by coating one or more conductive metals on an Al powder by an electroless plating method, There is provided a conductive metal-coated Al powder capable of producing a conductive metal powder while achieving cost reduction at a low cost, and capable of obtaining a conductive metal-coated Al powder having improved electrical conductivity as well as improved corrosion resistance, and a manufacturing method thereof.

According to one aspect of the present invention, an Al powder is formed by coating a conductive metal with one or more metals by an electroless plating method.

According to the present invention, the conductive metal-coated powder has a volume cumulative maximum particle diameter D _max according to the laser diffraction scattering particle size distribution measurement method And has a powder property of 70.0 탆 or less.

According to the present invention, the conductive metal is one selected from the group consisting of nickel, copper, gold, silver, palladium, platinum, iron, zinc, tin, rhodium and indium or an alloy thereof.

According to another aspect of the present invention, there is provided a method for producing the conductive metal coated Al powder according to another aspect of the present invention, which comprises: washing the surface of an Al powder with water, rinsing the surface after surface roughing, rinsing after forming a zinc- And then proceeding to a metal covering treatment.

According to the present invention, the surface cleaning process is characterized by containing 1.0-10.0 g / l of boric acid, 0.5-5.0 g / l of sodium bicarbonate, 1.0-10.0 g / l of sodium phosphate and water.

According to the present invention, the surface roughing process is characterized by containing 1.0-10.0 g / l of sodium hydroxide, 1.0-5.0 g / l of sodium carbonate, 1.0-10.0 g / l of sodium phosphate and water.

According to the present invention, the zinc-containing film forming process includes a step of forming a zinc-containing film containing 1.0-10 g / l zinc oxide, 1.0-10 g / l sodium hydroxide, 0.1-1.0 g / l sodium chloride, 1.0-10.0 g / l sodium gluconate, .

It should be understood, however, that the terminology or words of the present specification and claims should not be construed in an ordinary sense or in a dictionary, and that the inventors shall not be limited to the concept of a term It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

As described above, the conductive metal-coated Al powder and the method for producing the same according to the present invention can be produced and used by coating one or more conductive metals by electroless plating in an Al powder state , The use of Al powder enables the production of conductive metal powder while lowering the cost by lowering the cost compared with the conventional conductive powder, and also provides an effect of obtaining a conductive metal-coated Al powder having improved electrical conductivity as well as improved corrosion resistance .

In addition, there is an effect of providing a low-cost conductive metal-coated Al powder that can be utilized for applications such as a conductive paste and a conductive paint for shielding electromagnetic waves.

1 to 3 are photographs of a conductive metal-coated Al powder according to the present invention observed with a scanning electron microscope (SEM).

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

The present invention relates to a method for manufacturing a conductive metal powder, which is capable of producing a conductive metal powder while reducing cost, by forming one or more kinds of conductive metal by coating with an electroless plating method on an Al powder, thereby improving the electrical conductivity and improving the corrosion resistance Thereby providing an inexpensive conductive metal-coated Al powder that can be utilized for applications such as conductive paste and conductive paint for shielding electromagnetic waves.

According to one aspect of the present invention, an Al powder is formed by coating one or more metals with a conductive metal by an electroless plating method. Here, the conductive metal-coated powder has a volume cumulative maximum particle diameter D _max according to the laser diffraction scattering particle size distribution measurement method And a powder property of 70.0 μm or less. The conductive metal according to the present invention is most preferably used in view of using one of nickel, copper, gold, silver, palladium, platinum, iron, zinc, tin, rhodium and indium or an alloy thereof.

According to another aspect of the present invention, there is provided a method for producing the conductive metal-coated Al powder. Such conductive metal-coated Al powder can be used for applications such as conductive paste and conductive paint for shielding electromagnetic waves.

According to the present invention, there is provided a method for producing a conductive metal-coated Al powder, comprising the steps of: washing the surface of an Al powder with water, washing with water after surface roughing, washing with water after forming a zinc- Go ahead.

Meanwhile, as an example of the main process steps, the surface cleaning process is to clean the surface on the Al powder to remove the oil or impurities, and then to rinse the surface. The surface roughing process forms a uniform surface over the surface, And the process of forming a zinc-based coating film proceeds to a process of forming a zinc-based coating film on the surface thereof, washing with water, and then performing a conductive metal coating treatment by electroless plating.

As a detailed construction of the present invention, the surface cleaning process comprises 1.0-10.0 g / l of boric acid, 0.5-5.0 g / l of sodium bicarbonate, 1.0-10.0 g / l of sodium phosphate and water, 1.0-10.0 g / l of sodium hydroxide, 1.0-5.0 g / l of sodium carbonate, 1.0-10.0 g / l of sodium phosphate and water. The zinc-containing film forming process is carried out by adding 1.0-10 g / l zinc oxide, 10 g / l of iron chloride, 0.1 to 1.0 g / l of iron chloride, 1.0 to 10.0 g / l of sodium gluconate and water.

As described above, according to the present invention, after washing the surface of the Al powder, rinsing the surface after surface roughing, rinsing after forming the zinc coating, washing with conductive metal by electroless plating, securing the conductive metal coated Al powder , Al powder is formed by coating one or more kinds of conductive metal by electroless plating method, and by using Al powder, it is possible to manufacture conductive metal powder while seeking cost reduction at low cost compared to conventional conductive powder, and electric conductivity It is possible to obtain a conductive metal coated Al powder which is excellent in corrosion resistance and can be used for a conductive paste using the same and a conductive paint for shielding electromagnetic waves.

Hereinafter, preferred embodiments and experimental examples are provided to facilitate understanding of the present invention. However, the following examples and experimental examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited by the examples.

[Example 1]

First, 5.0 g / l of boric acid, 2.5 g / l of sodium hydrogencarbonate and 5.0 g / l of sodium phosphate are mixed with the surface cleaning solution, and the solution is stirred and dissolved. Then, the surface roughing solution was mixed with 5.0 g / l of sodium hydroxide, 2.5 g / l of sodium carbonate and 5.0 g / l of sodium phosphate, and the mixture was stirred and dissolved. Then, the zinc-containing film forming solution was mixed with 5.0 g / l of zinc oxide, 5.0 g / l of sodium hydroxide, 0.5 g / l of ferric chloride and 5.0 g / l of sodium gluconate and stirred to dissolve.

Based on the solution thus prepared, electroless plating was performed on the Al powder as shown in Table 1 below.

For the evaluation of the physical properties, 15 g of the conductive metal-coated Al powder prepared by using Table 1 was mixed with glass frit, binder and dispersant for 20 minutes, stirred at 2000 rpm / 2 minutes using a Thinky mixer, Screen printing was performed on a ceramic substrate and the substrate was heated at 550 ° C / hr for 30 minutes using an N ₂ gas atmosphere electric furnace After sintering, a conductive metal coated Al powder paste was prepared.

[Example 2]

The surface cleaning solution was mixed with 5.0 g / l of boric acid, 2.5 g / l of sodium bicarbonate and 5.0 g / l of sodium phosphate, and the mixture was stirred to dissolve and then heated to maintain the temperature at 40 ° C. Then, the surface roughing solution was mixed with 5.0 g / l of sodium hydroxide, 2.5 g / l of sodium carbonate and 5.0 g / l of sodium phosphate, and the mixture was stirred and dissolved. Then, the zinc-containing film forming solution was mixed with 5.0 g / l of zinc oxide, 5.0 g / l of sodium hydroxide, 0.5 g / l of ferric chloride and 5.0 g / l of sodium gluconate and stirred to dissolve.

The solution thus prepared was subjected to electroless plating on the base Al powder as shown in Table 2 below.

For evaluation of the physical properties, the conductive metal-coated Al powder prepared in [Table 2] was mixed with glass frit, binder and dispersant using 15 g as shown in FIG. 1, and the mixture was stirred for 20 minutes using a Thinky mixer at 2000 rpm / Screen printing was performed on the substrate and the substrate was heated at 550 ° C / hr for 30 min using an N ₂ gas atmosphere electric furnace After sintering, a conductive metal coated Al powder paste was prepared.

[Example 3]

The surface cleaning solution was mixed with 5.0 g / l of boric acid, 2.5 g / l of sodium bicarbonate and 5.0 g / l of sodium phosphate, and the mixture was stirred to dissolve and then heated to maintain the temperature at 40 ° C. Then, the surface roughing solution was mixed with 5.0 g / l of sodium hydroxide, 2.5 g / l of sodium carbonate and 5.0 g / l of sodium phosphate, and the mixture was stirred and dissolved. Then, the zinc-containing film forming solution was mixed with 5.0 g / l of zinc oxide, 5.0 g / l of sodium hydroxide, 0.5 g / l of ferric chloride and 5.0 g / l of sodium gluconate and stirred to dissolve.

The solution thus prepared was subjected to electroless plating on a base Al powder as shown in [Table 3] below.

For evaluation of the physical properties, 15 g of conductive metal-coated Al powder prepared by using Table 3 was mixed with glass frit, binder and dispersant for 20 minutes, stirred at 2000 rpm / 2 minutes using a Thinky mixer, Screen printing was performed, and an N ₂ gas atmosphere electric furnace was used at 550 ° C / hr for 30 min After sintering, a conductive metal coated Al powder paste was prepared.

[Comparative Example 1]

For evaluation of the physical properties by using the nickel powder 15g mixed 20 minutes was added to the glass frit and brother-in-law and dispersing agents and Thinky mixer using 2000rpm / 2min stirring ceramic substrate Screen Printing a and 550 ℃ / using an N ₂ gas atmosphere furnace hr 30 min After sintering, Ni paste was prepared.

[Comparative Example 2]

By using copper powder 15g for property evaluation mixed 20 minutes was added to the glass frit and brother-in-law and dispersing agents and Thinky mixer using 2000rpm / 2min stirring ceramic substrate Screen Printing a and 550 ℃ / using an N ₂ gas atmosphere furnace hr 30 min After sintering, Ni paste was prepared.

On the other hand, the following tests were carried out on the above Examples 1, 2, 3 and Comparative Examples 1 and 2 to evaluate their properties. The evaluation results are shown in Table 4 below.

[Measurement of electric resistance]

Coated with conductive metal-coated Al on a ceramic substrate, dried to form a film having a thickness of 30 mu m, and then its resistance was measured.

As is apparent from the above results, Examples 1 to 3 show that the Ni powder and the Cu powder have been made into paste after the Al powder was subjected to the resistance measurement, and the results of the measurements show excellent results of about 0.0005? have.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

Claims (7)

Wherein the conductive metal-coated Al powder is formed by coating an electrically conductive metal with one or more metals by an electroless plating method on an Al powder. The method according to claim 1,
The conductive metal-coated powder had a volume cumulative maximum particle diameter D _max according to the laser diffraction scattering particle size distribution measurement method Wherein the powder has a powder characteristic of 70.0 탆 or less. The method according to claim 1,
Wherein the conductive metal is one of nickel, copper, gold, silver, palladium, platinum, iron, zinc, tin, rhodium and indium or an alloy thereof. A method for producing the conductive metal coated Al powder of claim 1, comprising:
The surface of the Al powder is washed with water, rinsed with water after surface roughing, rinsed with water after the formation of the zinc coating, and then subjected to a conductive metal coating treatment by electroless plating. The method according to claim 1,
Wherein the surface cleaning process comprises 1.0-10.0 g / l of boric acid, 0.5-5.0 g / l of sodium bicarbonate, 1.0-10.0 g / l of sodium phosphate and water. The method according to claim 1,
Wherein the surface roughing process comprises the steps of: providing 1.0-10.0 g / l of sodium hydroxide, 1.0-5.0 g / l of sodium carbonate, 1.0-10.0 g / l of sodium phosphate and water. The method according to claim 1,
Wherein the zinc-containing film forming process comprises a step of forming a zinc-containing film on a surface of a substrate, wherein the zinc-containing film comprises 1.0-10 g / L of zinc oxide, 1.0-10 g / L of sodium hydroxide, 0.1-1.0 g / L of sodium chloride, 1.0-10.0 g / L of sodium gluconate, Method of manufacturing metal coated Al powder.

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