KR100518949B1 - Manufacturing Method of Expanded Graphite Products - Google Patents
Manufacturing Method of Expanded Graphite Products Download PDFInfo
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- KR100518949B1 KR100518949B1 KR10-2003-0020202A KR20030020202A KR100518949B1 KR 100518949 B1 KR100518949 B1 KR 100518949B1 KR 20030020202 A KR20030020202 A KR 20030020202A KR 100518949 B1 KR100518949 B1 KR 100518949B1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
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- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
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Abstract
본 발명에 따른 팽창흑연 성형품 제조방법은 가루형의 팽창흑연을 얇게 펴서 롤러나 프레스로 압축 가공하여 흑연박막을 만든 후, 상기 흑연박막을 잘게 쪼개어 흑연 플레이크를 만들고, 상기 흑연 플레이크들을 흑연과 열팽창계수가 비슷한 섬유상 물질과 함께 금형에 넣고 프레스를 이용하여 압축함으로써 팽창흑연 성형품을 제조하기 때문에 그 조직이 치밀하고 균일하며 방향성이 없기 때문에 전방향에 걸쳐 기계적 성질이 우수하고, 금형을 이용하여 시트형 뿐만 아니라 링형 등 다양한 형상으로 제조될 수 있으며, 프레스의 용량이 비교적 작기 때문에 초기 투자비용이 저렴하다.In the expanded graphite molded article manufacturing method according to the present invention, after forming a graphite thin film by thinly expanding the expanded graphite in a powder form using a roller or a press, the graphite thin film is finely divided to make graphite flakes, and the graphite flakes are made of graphite and a thermal expansion coefficient. Expanded graphite molded articles are manufactured by placing them in a mold together with similar fibrous materials and compressing them with a press, so their structure is dense, uniform and non-directional, so the mechanical properties are excellent in all directions. It can be produced in a variety of shapes, and the initial investment is low because the capacity of the press is relatively small.
Description
본 발명은 팽창흑연을 이용하여 팽창흑연 성형품을 제조하는 방법에 관한 것으로서, 특히 팽창흑연 가루를 압축하여 플레이크 형태로 만든 다음 형틀에 넣고 성형하여 팽창흑연 성형품을 얻는 팽창흑연 성형품 제조방법에 관한 것이다.The present invention relates to a method for producing expanded graphite molded articles using expanded graphite, and more particularly, to a method for producing expanded graphite molded articles obtained by compressing expanded graphite powder into a flake form and then placing it in a mold to form expanded graphite molded articles.
일반적으로 흑연은 탄소원자의 6원자 고리가 평면적으로 무한히 연결된 평면형 거대분자가 층을 이루어 포개어진 광물로서, 그 성질은 전기의 양도체이고, 또한 폴리센의 층상구조로 인해 유연하고 활성(滑性)이 있으며, 쪼개지기는 쉽지만 거대 분자여서 반응성이 낮은 특징이 있다.In general, graphite is a mineral formed by layering planar macromolecules in which six-membered rings of carbon atoms are infinitely connected in a planar manner, and their properties are good conductors of electricity and are flexible and active due to the layered structure of polysene. It is easy to split, but is a macromolecule and has low reactivity.
그러나, 흑연은 폴리센 구조의 탄소 평면 사이가 반데르발스 힘으로 연결되어 있을 뿐이어서 탄소원자 사이의 간격인 14.2㎚에 비하여 35.5㎚로 넓기 때문에 층 사이의 틈새에 다른 원자를 삽입하여 층간화합물을 만들 수 있다. 즉, 흑연 결정의 망상평면을 유지한 채로 평면 사이의 틈새에 많은 원자나 분자 또는 이온을 삽입하여 층간화합물을 만드는 것이다. However, since graphite is only connected between carbon planes of polysene structure with van der Waals forces, it is 35.5 nm wider than 14.2 nm, which is the interval between carbon atoms, thus inserting another atom into the gap between layers. I can make it. That is, interlayer compounds are made by inserting many atoms, molecules, or ions into the gaps between the planes while maintaining the network plane of the graphite crystals.
즉, 흑연의 층 사이에 황산과 같은 산을 도포한 층간화합물 또는 잔류화합물을 1000℃에 가까운 온도로 급 가열하면, 산이 기화되어 가스가 발생되고 그 가스의 팽창압에 의해 흑연 층간이 수십 내지 수백 배로 팽창하는데, 이를 팽창흑연이라 한다. That is, when the interlayer compound or residual compound coated with an acid such as sulfuric acid is rapidly heated to a temperature close to 1000 ° C between the layers of graphite, the acid is vaporized and gas is generated, and the graphite pressure is increased by several tens to several hundreds. It is expanded by ship, which is called expanded graphite.
상기한 팽창흑연은 열전도율 및 탄성력이 좋고 자기 윤활성을 갖고 있기 때문에 시트 형태로 성형된 후, 절삭 등의 기계적인 추가 가공을 거쳐 가스켓, 실링, 단열재, 쿠션재 등으로 널리 사용되고 있다.Since the expanded graphite has good thermal conductivity and elasticity and has self-lubricating property, it is widely used as a gasket, a sealing, a heat insulating material, a cushioning material, and the like after being molded into a sheet form and subjected to mechanical additional processing such as cutting.
종래 기술에 따른 팽창흑연 성형품의 제조방법을 도 1을 참조하여 구체적으로 설명하면, 다음과 같다.먼저, 팽창흑연의 밀도가 보통 1/50~1/200이므로 팽창흑연을 성형하고자 하는 팽창흑연 시트의 두께와 팽창흑연의 밀도를 고려하여 팽창흑연을 일정 높이로 적층한다(S11,S12참조). 일 예로써 팽창흑연의 밀도가 1/200일 때, 밀도가 1이고 5mm 두께의 팽창흑연 성형품을 성형하고자 할 경우, 금형속에 팽창흑연을 5mm의 200배 정도에 달하는 1m가량 적층한다. 다음 프레스를 이용하여 일정 높이로 적층된 팽창흑연을 압축한다(S13참조). 이 때, 상기 팽창흑연의 적층 높이가 매우 높기 때문에 상기 팽창흑연의 층과 층 사이 공간에 들어있는 공기가 모두 제거되지는 않는다. 즉, 상술한 바와 같이 팽창흑연의 밀도가 1/200이고, 1m가량 적층된 상태에서 압축된 경우, 상기 프레스에 의해 압축된 일차 압축 흑연물은 그 두께가 5mm보다 두껍다.따라서, 상기 일차 압축 흑연물은 압연장치에 의해 이차적으로 한번 더 압축 가공된다. 그러면, 상기 일차 압축 흑연물이 압연장치에 의해 압연됨에 따라 상기 일차 압축 흑연물에 포함된 공기가 서서히 제거되면서 고밀도의 팽창흑연 성형품이 된다(S14참조). 이 때, 상기 고밀도의 팽창흑연 성형품은 압연장치에 의해 최종적으로 성형되기 때문에 시트 형태이다.A method of manufacturing an expanded graphite molded article according to the prior art will be described in detail with reference to FIG. 1. First, an expanded graphite sheet which is intended to mold expanded graphite since the density of the expanded graphite is usually 1/50 to 1/200. The expanded graphite is laminated to a certain height in consideration of the thickness of the expanded graphite and the density of the expanded graphite (see S11 and S12). As an example, when the expanded graphite has a density of 1/200, when the expanded graphite molded article having a density of 1 and 5 mm is to be molded, the expanded graphite is laminated in a mold by about 1 m, which is about 200 times larger than 5 mm. Next, the expanded graphite laminated to a certain height is compressed using a press (see S13). At this time, since the stacking height of the expanded graphite is very high, all the air contained in the layer and the interlayer space of the expanded graphite is not removed. That is, when the expanded graphite has a density of 1/200 as described above and is compressed in a stacked state of about 1 m, the primary compressed graphite compressed by the press is thicker than 5 mm. Thus, the primary compressed graphite The water is secondarily compressed again by means of a rolling machine. Then, as the primary compressed graphite is rolled by a rolling apparatus, air contained in the primary compressed graphite is gradually removed to form a high-density expanded graphite molded article (see S14). At this time, the high-density expanded graphite molded article is in the form of a sheet since it is finally molded by a rolling apparatus.
삭제delete
그러나, 종래 기술에 따른 팽창흑연 성형품 제조방법은 성형하고자 하는 팽창흑연 시트의 두께가 두꺼워질수록 그만큼 팽창흑연을 높이 쌓기 때문에 프레스의 용량이 크고, 프레스 공정 후 압연공정을 거치므로 대용량 프레스기와 압연기가 필요하여 설비시설이 방대하고, 성형품의 조직이 치밀하지 못해 기계적 성질이 좋지 않을 뿐만 아니라 팽창흑연을 시트형으로만 성형할 수 있고, 압연 공정시 길이방향의 연속적인 가공으로 인해 방향성이 생기는 문제점이 있다.However, the method for producing expanded graphite molded article according to the prior art has a larger capacity of the press because the expanded graphite sheet to be formed increases as the thickness of the expanded graphite sheet to be formed increases, and thus the large-capacity press machine and the rolling mill are subjected to the rolling process after the press process. It is necessary to have a large facility and a compact structure of the molded product, so that the mechanical properties are not good, and the expanded graphite can be formed only into a sheet shape, and there is a problem that the direction is generated due to the continuous processing in the longitudinal direction during the rolling process. .
본 발명은 상기한 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 팽창흑연을 고밀도의 플레이크로 만들고, 고밀도의 플레이크를 금형에 넣고 원하는 형상으로 성형하여 팽창흑연 성형품을 만드는 팽창흑연 성형품 제조방법을 제공하는데 그 목적이 있다.The present invention has been made in order to solve the above problems of the prior art, to provide expanded graphite molded article manufacturing method of making expanded graphite molded product into a high density flake, inserting the high density flake into a mold and forming an expanded graphite molded article Its purpose is to.
상기한 기술적 과제를 해결하기 위한 본 발명에 따른 팽창흑연 성형품 제조방법은 얇게 펼친 팽창흑연을 압착하여 흑연박막을 형성하는 제1공정과; 상기 흑연박막을 분쇄하여 흑연 플레이크를 만드는 제2공정과; 상기 흑연 플레이크를 바인더와 함께 금형에 넣고 압축 성형하여 팽창흑연 성형품을 만드는 제3공정으로 이루어진다.Method for producing an expanded graphite molded article according to the present invention for solving the above technical problem is a first step of forming a graphite thin film by pressing the expanded expanded graphite; A second step of grinding the graphite thin film to produce graphite flakes; The graphite flake is put into a mold together with a binder and compression molded to form a expanded graphite molded article.
이하, 첨부된 도면을 참조하여 본 발명의 실시 예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.
본 발명에 따른 팽창흑연 성형품 제조방법은 도 2에 도시된 바와 같이 가루형의 팽창흑연을 얇게 펼쳐진 상태에서 압축 가공하여 고밀도의 흑연박막을 형성하는 제1공정과(S21,S22참조), 상기 흑연박막을 분쇄하여 흑연 플레이크를 만드는 제2공정과(S23참조), 상기 흑연 플레이크를 바인더와 함께 금형에 넣고 프레스를 이용하여 압축 성형하여 소정 형상의 팽창흑연 성형품을 만드는 제3공정(S24~S26참조)으로 이루어진다.In the expanded graphite molded article manufacturing method according to the present invention, as shown in Fig. 2, the first step of forming a high-density graphite thin film by compressing the expanded expanded graphite in a thin unfolded state (see S21 and S22), and the graphite thin film 2nd process of grinding graphite flakes (refer to S23), and 3rd process of making the graphite graphite molded product of a predetermined shape by compression molding using the graphite flake together with a binder in a mold (see S24 to S26). Is done.
각 공정을 구체적으로 설명하면, 먼저 제1공정은 종래와 달리 팽창흑연을 높이 적층하여 압축하는게 아니라 가루형의 팽창흑연을 얇게 펼친 상태에서 프레스나 롤러를 이용하여 압축 가공함으로써 매우 얇은 두께의 흑연박막으로 성형한다. 따라서, 상기 팽창흑연의 밀도가 1/50~1/200정도로 매우 낮기 때문에 비교적 용량이 적은 롤러나 프레스를 이용하여 가루형의 팽창흑연을 눌러주면, 고밀도의 흑연박막을 만들 수 있다(S21,S22참조).To describe each process in detail, the first process does not stack and expand the expanded graphite, unlike the conventional one, but compresses by using a press or a roller in a state where the expanded expanded graphite is thinly formed into a graphite thin film having a very thin thickness. Mold. Therefore, since the density of the expanded graphite is very low, about 1/50 to 1/200, by pressing the expanded graphite in powder form using a roller or press having a relatively small capacity, a high-density graphite thin film can be made (see S21 and S22). ).
제2공정은 상기 흑연박막을 절단기를 이용하여 스트라이프나 사각형으로 모두 일정한 형상을 갖도록 절단함으로써 상기 흑연 플레이크를 만들거나, 분쇄기를 이용하여 부정형 상으로 잘게 쪼개어 상기 흑연 플레이크를 만든다(S23참조).In the second step, the graphite thin film is cut into strips or squares using a cutter so as to have a uniform shape, or the graphite flakes are finely divided into irregular shapes using a grinder to produce the graphite flakes (see S23).
다음, 제3공정은 링형 등의 일정 형상을 갖는 금형에 상기 흑연 플레이크들을 넣어 채우고, 상기 흑연 플레이크들이 상호 고착될 수 있도록 인산염계 또는 세라믹계, 탄소계 중 어느 하나의 바인더를 도포한 다음 프레스를 이용하여 압축 성형한다(S24,S25참조)Next, the third process is to fill the graphite flakes into a mold having a certain shape, such as a ring-shaped, and to apply the binder of any one of phosphate-based, ceramic-based, carbon-based so that the graphite flakes are fixed to each other and then press By compression molding (see S24, S25)
이 때, 상기 흑연 플레이크는 제1공정을 통해 일차적으로 압축되어 밀도가 높기 때문에 프레스의 용량이 클 필요가 없으며, 팽창흑연 성형품은 흑연박막 제조시 가루형의 팽창흑연이 완전히 압축되어 고밀도의 흑연박막으로 만들어지고, 작은 크기의 흑연 플레이크가 서로 엉켜 촘촘하게 결합됨과 아울러 바인더에 의해 상호 견고하게 결합되기 때문에 그 밀도가 균일하면서 높아 기계적 성질이 우수하다. At this time, since the graphite flake is primarily compressed through the first process and has a high density, the press capacity does not need to be large. The expanded graphite molded article is compressed to a high density graphite thin film by completely compressing the powdery expanded graphite when manufacturing the graphite thin film. It is made, and the graphite flakes of small size are entangled with each other and tightly bonded to each other by a binder, so that their density is uniform and high, and the mechanical properties are excellent.
물론, 팽창흑연 성형품은 흑연 플레이크가 바인더에 의해 상호 견고하게 결합되어 있어 그 형상이 유지되며, 금형의 형상에 따라 필요한 모양과 밀도의 팽창흑연 성형품을 얻을 수 있다. Of course, in the expanded graphite molded article, the graphite flakes are firmly bonded to each other by a binder to maintain the shape thereof, and thus, the expanded graphite molded article having the required shape and density can be obtained according to the shape of the mold.
그리고, 상기 제3공정은 금형에 섬유상 물질을 함께 넣고 팽창흑연 성형품을 성형하면, 상기 섬유상 물질로 인해 그 조직이 더욱 보강되어서 기계적 성질이 더 향상된다(S26참조). 상기 섬유상 물질로는 여러 섬유상 물질 중 팽창흑연과 열팽창계수가 비슷한 탄소섬유가 바람직하다. In the third step, when the fibrous material is put together in the mold and the expanded graphite molded article is molded, the structure is further reinforced by the fibrous material, thereby improving mechanical properties (see S26). As the fibrous material, carbon fiber having a similar coefficient of thermal expansion and thermal expansion among various fibrous materials is preferable.
마지막으로, 상기와 같은 공정을 통해 성형된 팽창흑연 성형품은 절삭이나 롤링, 연삭 등의 기계적인 추가 가공을 통해 더욱 정밀하게 가공함으로써 상품성이 향상될 수 있다.(S27참조)Finally, the expanded graphite molded article formed through the above process can be processed more precisely through mechanical additional processing such as cutting, rolling, grinding, etc., thereby improving the productability. (See S27)
한편, 본 발명의 다른 실시예에 따른 팽창흑연 성형품 제조방법은 도 3에 도시된 바와 같이 가루형의 팽창흑연에 바인더를 도포한 후(S31,S32참조), 롤러나 프레스를 이용하여 눌러줌으로써 흑연박막을 형성하는 제1공정(S33참조)과, 상기 흑연박막을 잘게 쪼개 흑연 플레이크를 만드는 제2공정(S34참조)과, 상기 흑연 플레이크들을 금형에 넣고 압축 성형하여 팽창흑연 성형품을 만드는 제3공정(S36참조)으로 이루어진다.Meanwhile, in the expanded graphite molded article manufacturing method according to another embodiment of the present invention, as shown in FIG. 3, after applying the binder to the expanded graphite in powder form (see S31 and S32), the graphite thin film is pressed by using a roller or a press. A first step of forming a graphite (see S33), a second step of breaking the graphite thin film into graphite flakes (see S34), and a third process of forming the expanded graphite molded article by compression molding the graphite flakes into a mold ( See S36).
상기 제1공정에서, 흑연박막은 가루형의 팽창흑연에 바인더가 도포되어 성형되기 때문에 팽창흑연 간 결합력이 클 뿐만 아니라, 표면에 상기 바인더가 코팅되어 있기 때문에 제3공정시 금형에 별도의 바인더를 더 도포할 필요가 없다.In the first step, since the graphite thin film is formed by applying a binder to the powdered expanded graphite, the bonding force between the expanded graphite is large, and because the binder is coated on the surface, a separate binder is added to the mold during the third process. There is no need to apply.
그러나, 상기 제3공정시 필요하면, 금형에 흑연 플레이크와 함께 바인더를 더 도포해도 무방하다.However, if necessary during the third step, a binder may be further applied to the mold together with the graphite flakes.
그리고, 상기 제3공정시 금형에 섬유상 물질이 함께 넣어져 팽창흑연 성형품이 성형될 수 있고(S35참조), 팽창흑연 성형품은 추가 가공공정을 더 거칠 수도 있다(S37참조). In the third process, the fibrous material is put together in the mold to form the expanded graphite molded article (see S35), and the expanded graphite molded article may be subjected to further processing (see S37).
물론, 상기와 같이 제조되는 팽창공정 성형품은 도 2에 도시된 팽창공정 성형품과 동일한 효과를 갖는 것은 당연하다.Of course, it is natural that the expansion process molded article manufactured as described above has the same effect as the expansion process molded article illustrated in FIG. 2.
상기와 같이 구성된 본 발명에 따른 팽창흑연 성형품 제조방법은 가루형의 팽창흑연을 얇게 펴서 롤러나 프레스로 압축 가공하여 흑연박막을 만든 후, 상기 흑연박막을 잘게 쪼개어 흑연 플레이크를 만들고, 상기 흑연 플레이크들을 흑연과 열팽창계수가 비슷한 섬유상 물질과 함께 금형에 넣고 프레스를 이용하여 압축함으로써 팽창흑연 성형품을 제조하기 때문에 그 조직이 치밀하고 균일하며 방향성이 없기 때문에 전방향에 걸쳐 기계적 성질이 우수하고, 금형을 이용하여 시트형 뿐만 아니라 링형 등 다양한 형상으로 제조될 수 있으며, 프레스의 용량이 비교적 작기 때문에 초기 투자비용이 저렴하다.In the expanded graphite molded article manufacturing method according to the present invention configured as described above, after forming a graphite thin film by thinly expanding the expanded graphite in powder form by a roller or a press, the graphite thin film is finely divided to make graphite flakes, and the graphite flakes are graphite. Since expanded graphite molded articles are manufactured by putting them in a mold together with a fibrous material with a similar thermal expansion coefficient and compressing them with a press, their structure is dense, uniform and non-directional, so the mechanical properties are excellent in all directions. It can be manufactured in various shapes such as not only a sheet type but also a ring type, and the initial investment cost is low because the capacity of the press is relatively small.
도 1은 종래 기술에 따른 팽창흑연 성형품 제조방법이 도시된 순서도,1 is a flow chart illustrating a method for manufacturing expanded graphite molded article according to the prior art,
도 2는 본 발명에 따른 팽창흑연 성형품 제조방법이 도시된 순서도,2 is a flow chart illustrating a method for producing expanded graphite molded article according to the present invention,
도 3은 본 발명의 다른 실시예에 따른 팽창흑연 성형품 제조방법이 도시된 순서도이다.Figure 3 is a flow chart illustrating a method for producing expanded graphite molded article according to another embodiment of the present invention.
Claims (6)
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| Application Number | Priority Date | Filing Date | Title |
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| KR10-2003-0020202A KR100518949B1 (en) | 2003-03-31 | 2003-03-31 | Manufacturing Method of Expanded Graphite Products |
| JP2006507782A JP2006521999A (en) | 2003-03-31 | 2004-03-29 | Method for producing expanded graphite product |
| PCT/KR2004/000712 WO2004087572A1 (en) | 2003-03-31 | 2004-03-29 | Manufacturing method of expanded graphite products |
| CA2518273A CA2518273C (en) | 2003-03-31 | 2004-03-29 | Manufacturing method of expanded graphite products |
| EP04724208.6A EP1611056B1 (en) | 2003-03-31 | 2004-03-29 | Manufacturing method of expanded graphite products |
| US10/508,016 US7105115B2 (en) | 2003-03-31 | 2004-03-29 | Manufacturing method of expanded graphite products |
| GB0518041A GB2414232B (en) | 2003-03-31 | 2004-03-29 | Manufacturing method of expanded graphite products |
| CNB2004800078049A CN100491241C (en) | 2003-03-31 | 2004-03-29 | Manufacturing method of expanded graphite products |
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| KR10-2003-0020202A KR100518949B1 (en) | 2003-03-31 | 2003-03-31 | Manufacturing Method of Expanded Graphite Products |
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| KR100518949B1 true KR100518949B1 (en) | 2005-10-06 |
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| WO2013191410A1 (en) * | 2012-06-18 | 2013-12-27 | Chang Joo Taek | Method for manufacturing ultra-thin thermal diffusion film using expanded graphite, and ultra-thin thermal diffusion film manufactured thereby |
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| CN102558895B (en) * | 2010-12-28 | 2016-05-25 | 碳元科技股份有限公司 | There is viscose glue goods and the manufacture method thereof of high thermal conductivity |
| KR101473432B1 (en) * | 2014-06-13 | 2014-12-16 | 에스케이씨 주식회사 | Method for fabricating graphite |
| KR101471397B1 (en) * | 2014-06-13 | 2014-12-10 | 에스케이씨 주식회사 | Method for fabricating graphite |
| CN105645982B (en) * | 2015-12-31 | 2018-11-20 | 中国人民解放军国防科学技术大学 | graphite composite cathode and preparation method thereof |
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| DE3004574A1 (en) * | 1980-02-08 | 1981-08-13 | Sigri Elektrographit Gmbh, 8901 Meitingen | METHOD FOR REGENERATING GRAPHITE FILM |
| US6217800B1 (en) * | 1996-01-25 | 2001-04-17 | Sgl Technic, Inc. | Graphite foam material and method of making same |
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| WO2013191410A1 (en) * | 2012-06-18 | 2013-12-27 | Chang Joo Taek | Method for manufacturing ultra-thin thermal diffusion film using expanded graphite, and ultra-thin thermal diffusion film manufactured thereby |
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