KR20110033336A - Electrically conductive carbon composite material containing composite material carbon nanotube - Google Patents

Abstract

PURPOSE: An electrically conductive carbon composite material containing a composite material carbon nanotube is provided to improve itself properties of metal or ceramic using excellent thermal conductivity, electric conductivity, and strength of the carbon nanotube. CONSTITUTION: An electrically conductive carbon composite material containing a composite material carbon nanotube is prepared by the steps of: preparing at least one kind of metal or alloy to a paste state; and carbonizing the prepared carbon nanotube after the paste is mixed with carbon nanotubes and carbon nanofibers. The metal or alloy is selected from gold, platinum, silver, copper, nickel, zinc, iron, lead, palladium, silicon, magnesium, aluminum, indium, nichrome, chrome, bismuth, antimony, titanium, stainless, beryllium, beryllia, brass, kanthal and inconel.

Description

Conductive carbon composite material mixed with carbon nanotubes {ELECTRICALLY CONDUCTIVE CARBON COMPOSITE MATERIAL CONTAINING COMPOSITE MATERIAL CARBON NANOTUBE}

According to the present invention, carbon nanotubes, in which carbon nanotubes themselves have excellent electrical conductivity, thermal conductivity, and rigidity, are used to improve the characteristics of metals or ceramics themselves, thereby minimizing the product size, high performance, and long life. It relates to a conductive carbon composite material.

At present, we are calling for resource conservation and vitalization in various industries to protect the global environment. As electrical / electronic parts or Molecular Sieve materials, metals, ceramics, glass, and composites are used, which have better physical / chemical properties and longer lifespan than conventional ones. Development is expected. In the solder industry, Pb-free solders (lead-free, 96.5% tin, 3% silver, and 0.5% copper ECO solders) are used instead of the existing tin-lead alloy solders that have been affected by the RoHS directive. Is becoming mainstream. Pb-free solders are more expensive than conventional leaded eutectic solders (composition examples, tin 63%, lead 37%) and have a higher melting point (Pb-free-210 ~ 220 ° C, process 183.3). ℃), the effect of heat on the part during the actual soldering also became a problem.

Recently, nanostructured carbon having a size of nanometa structure, such as C60 flaren, carbon nanofibers, graphite nanofibers, has attracted attention. The nanostructured carbon mentioned above has special functional and structural properties because of its special structure. For example, carbon nanofibers are expected to have thousands of Gpa young's modulus, and high strength is expected to be used as a mixture with various materials.

For example, carbon nanotubes having an average diameter of 1 to 45 mm and an average aspect ratio of 5 or more are used for the purpose of making molded articles having excellent strength, formability and conductivity, including carbon fibers, metal-coated carbon fibers, carbon powder, and glass. It is proposed to obtain and process a carbon-containing resin composition dispersed in a resin such as an epoxy resin mixed with a dust material such as fiber and an unsaturated polyester resin (Patent Publication 200-12939). In order to improve the thermal conductivity and tensile strength of the aluminum alloy material, at least one of Si, Mg and Mn, which are components of the aluminum alloy material, is combined with carbon nanofibers, and an aluminum alloy material containing carbon nanofibers in the aluminum matrix is proposed. Doing. The carbon nanofibers are mixed into 0.1-5 vol% molten aluminum alloy material, mixed into a billet, and provided as an extruded shape member of an aluminum alloy material obtained by extrusion molding the billet (Patent Publication 2002-363716).

Furthermore, in order to obtain a highly conductive material having excellent moldability applicable to separators of fuel cells, metal compounds (borides: Tib2, WB, MoB, CrB, AIB2, MgB) are made of a thermally reversible resin having excellent fluidity such as PPS and LCP. , A carbide: WC, a nitride: TiN, etc.) and a carbon nanotube are blended in an appropriate amount to propose a resin molded body having both moldability and conductivity (Patent Publication 2003-34751).

Field emitters containing carbon nanotubes, such as metal alloys made of nanotube wettability elements such as indium, bismuth or lead, and conductive materials such as relatively soft and ductile metal powders such as Ag, Au or Sn. Press-molding powder and carbon nanotubes to protrude the surface after cutting or polishing to form nanotubes, and etching the surface to form a nanotube tip, and then remelting the metal surface to protrude. A method for producing nanotubes by the process of aligning has been proposed (Patent Publication 2000-223004).

For the purpose of ceramic composite nanostructures for realizing various functions and optimizing various functions, for example, different types of metal elements are combined with oxygen to be composed of a plurality of multivalent metal element oxides selected for a certain function. In order to select a manufacturing method, and to manufacture a columnar body having a maximum diameter of 500 nm or shorter in a shorter cross-section by various known methods (Patent Publication 203-268120).

However, the carbon nanotubes to be dispersed in the above-mentioned resins or aluminum alloys are those which have high dispersibility in consideration of obtaining the obtained composite material manufacturability and required moldability. It is not intended to effectively utilize electrical conductivity, thermal conductivity characteristics, and rigidity.

The present invention has been made to solve the above problems, and the problem to be solved by the present invention is to actively use the excellent electrical conductivity, thermal conductivity, and rigidity of carbon nanotubes themselves, thereby improving the characteristics of the metal or ceramic itself product It is to provide a conductive carbon composite material in which carbon nanotubes having improved miniaturization, high performance, and long life are mixed.

Another object of the present invention is to utilize the excellent electrical conductivity, thermal conductivity and strength characteristics of carbon nanotubes inherently long chain or network structure together with the properties of ceramics or metal powder materials having insulation but corrosion resistance and heat resistance. It is to provide a conductive carbon composite material in which a carbon nanotube is mixed.

The conductive carbon composite material incorporating the carbon nanotubes of the present invention is gold, platinum, silver, copper, nickel, zinc, iron, lead, palladium, silicon, magnesium, aluminum, indium, nichrome, chromium, bismuth, antimony, titanium One or more metals and alloys selected from stainless steel, beryllium, beryllium oxide, brass, cantal, and inconel are made into a paste and mixed with carbon nanotubes and carbon nanofibers.

Preferably, the conductive carbon composite material is characterized in that the fluidized by mixing with the flux (flux) as a powder.

In the conductive carbon composite material in which the carbon nanotubes of the present invention are mixed, a carbon composite fiber material and an antioxidant sheet material can be obtained by adsorbing carbon nanotubes or carbon nanofibers to fibers such as clothing, paper, and wood.

In addition, carbon composite fiber material and antioxidant sheet material can be used as clothing or hair wig material.Bon nanotubes and carbon nanofibers have excellent heat dissipation properties. I can make it. In particular, the paints and adhesives are well suited for the repair of cultural property.

The conductive carbon composite material in which carbon nanotubes are mixed may be used as a semiconductor material, an antioxidant ceramic, and a solder chip in which a conductive carbon composite material is mixed or sintered with a ceramic.

In addition, nanotech is widely applied technology, especially coil material, thermocouple, compensation wire, terminal, filament, LED light emitting material, electrode, busbar leader wire, fer material, heater material, IC, IC chip, resistor, capacitor, motor It can be widely applied as a material for electronic devices such as winding coil materials, sensor materials, sensor coil materials, blades, tools, automobiles, ships, spacecraft, medical, biotechnology, distribution industry, environment, robots, and sporting goods.

In the method for producing a conductive carbon composite material of the present invention, first, a metal and an alloy thereof are mixed with a carbon nanotube and a carbon nanofiber (fiber) in a paste state to obtain a fluidized mixture. The paste mentioned above may be a liquid or pellet which is a powder fluidized by a heating method or the like.

In a preferred embodiment of the carbon composite material disclosed in the present invention, the metal and alloy mixed with carbon nanotubes and carbon nanofibers are gold, platinum, silver, copper, nickel, zinc, iron, lead, palladium, silicon. At least one metal and alloy selected from magnesium, aluminum, indium, nichrome, chromium, bismuth, antimony, titanium, stainless steel, beryllium, beryllium oxide, brass, cantal, and inconel.

As a method of obtaining the mixture of the above-mentioned carbon nanotube, carbon nanofiber, and a metal, annealing is mentioned, for example.

In the manufacturing method of the present invention, the conductive carbon composite material described above can be fluidized by mixing with flux as a powder.

As a result, the wettability of metals can be added to the carbon nanotubes, and thus, it becomes a material such as a solder chip having high conductivity, and when used as a solder material, powder, paste, wire solder, resin-containing wire solder, rod (I) It is applicable to soldering and washer springs.

The fluidized conductive carbon composite material is also used as an adsorbent for nitrogen production equipment.

In the manufacturing method of the present invention, a semiconductor material or a ceramic oxide can be obtained by mixing or sintering a conductive carbon composite material with a ceramic.

For the sintering of the aforementioned conductive carbon composite material and ceramic, for example, hot-pressure sintering may be used in an N ₂ atmosphere.

As a correct form of the semiconductor material disclosed in the present invention, the ceramics mentioned above include oxides such as alumina and zirconia, nitrides such as aluminum nitride, titanium oxide, silicon nitride, silicon carbide, titanium carbide, tantalum carbide, and tungsten carbide Ceramics having a variety of known mechanical functions, such as carbides such as carbides, titanium borides, zirconia borides, and chromium borides, and a function of improving grain boundary slip at the time of reverse deformation can be employed. For example, you may employ | adopt the functional ceramic which exhibits the required function, such as corrosion resistance and heat resistance.

The carbon composite material of the present invention is made of a ceramic (sintering material) having excellent corrosion resistance and heat resistance, a ceramic powder sintered body having excellent corrosion resistance and heat dissipation, and the aforementioned material itself has excellent durability under corrosive or high temperature environment. By uniformly dispersing the carbon nanotubes in the carbon nanotubes, the excellent electrical conductivity and thermal conductivity and strength of the carbon nanotubes themselves are combined to enhance the required characteristics, synergistic effects, or new functions.

In particular, the carbon composite material of the present invention has realized a structural material having extremely excellent properties in terms of elasticity, heat resistance, thermal conductivity, and conductivity as well as mechanical strength. For this reason, spring materials, vis screws, nuts, washers, bolts, gears, tools, baseballs (extensions), blades, abrasives, lubricants, adhesives, bearing clothing, housing, shafts, columns, roofs, roof tiles, barrels, etc. It is used as a material for home appliances such as building materials, FA equipment, TV, refrigerator, etc.

Furthermore, the carbon composite material of the present invention is also very suitable as a solder chip material. Conventional solder chips have low durability and need to be replaced frequently, but the carbon composite materials mentioned above have excellent durability and conductivity, and thus have low corrosion resistance and can significantly improve the replacement frequency.

Moreover, in the manufacturing method of this invention, a conductive paste material can be obtained by mixing a carbon nanotube with a conductive paste material.

The conductive paste material contains, for example, a thermosetting resin and a conductive filler.

The conductive paste material of the present invention is not only excellent in adhesive strength and conductivity, but also excellent in adhesive strength and conductivity balance. Therefore, the semiconductor device using the conductive paste material of the present invention can maintain excellent electrical characteristics without deterioration in adhesive strength and conductivity even in a high temperature and high humidity environment.

In addition, a heat resistant conductive paste material can be obtained by mixing or sintering the aforementioned conductive paste material with a ceramic.

Hereinafter, the present invention will be described with respect to the field of application.

By mixing the metal with the carbon nanotubes, the tin alloy solder melts at a temperature, so that the so-called wettability is in a good state that the diffusion reaction occurs with the chip tip metal and does not easily fall in the opposite direction to the direction of gravity. In addition, due to the characteristics of carbon nanotubes, the thermal conductivity and electrical conductivity are higher than those of metal-only chips, and the wear caused by heat is reduced.

In addition, when the present invention is used as the oxygen adsorbent used in the nitrogen generating device, the carbon nanocube material or the molecular sieve of the composite filled in the cylinder adsorbs oxygen to remove nitrogen gas. Since the adsorption property is higher than that of the conventional molecular sieve, it can be miniaturized.

Claims (2)

Among gold, platinum, silver, copper, nickel, zinc, iron, lead, palladium, silicon, magnesium, aluminum, indium, nichrome, chromium, bismuth, antimony, titanium, stainless, beryllium, beryllium oxide, brass, cantal, inconel A conductive carbon composite material in which carbon nanotubes are mixed with carbon nanotubes and carbon nanofibers by mixing one or more selected metals and alloys in a paste state. The conductive carbon composite material of claim 1, wherein the conductive carbon composite material is powdered and mixed with flux to fluidize the carbon nanotubes.