Abstract:
PURPOSE: A method for growing carbon nanoflakes and a carbon nanoflake structure formed by the same are provided to enable a user to easily grow nanoflakes without an additional catalyst or plasma. CONSTITUTION: A method for growing carbon nanoflake comprises the steps of: preparing a silicone substrate equipped with carbon nanotubes; growing carbon nanoflakes on carbon nanotubes in a chemical vapor-deposition process using the mixing gas of methane, hydrogen and argon as a precursor. In the chemical vapor-deposition process, argon is excessive in the mixing gas of methane, hydrogen and argon. Graphene layers constituting carbon nanotubes are partially etched in an argon-excessive atmosphere. Graphene layers of carbon nanoflakes grow at the position of etching. [Reference numerals] (CNT,CNF) Graphene layer
Abstract:
PURPOSE: A method for manufacturing a nano-crystalline diamond thin film is provided to maximize the electrostatic attraction between the substrate surface and the nano-diamond particles, thereby uniformly distributing and coupling the nano-diamond particles on the silicon oxide film of the substrate. CONSTITUTION: A method for manufacturing a nano-crystalline diamond thin film comprises the following steps. A silicone substrate surface coated with a silicon oxide film (SiO2) is processed with the hydro plasma or the plasma mixed with hydrogen and hydrocarbon or the silicone substrate surface is heat-treated under the mixed gas atmosphere with the hydrogen and hydrocarbon. After the coated substrate is put in the solution in which nano-diamond particles are dispersed, the nano-diamond particles are scattered on the substrate and are coupled with the substrate surface by emitting ultrasound. In a state where the nano-diamond particles are coupled to the substrate through the ultrasound scattering step, the diamond thin film is grown by applying the process of chemical vapor deposition.
Abstract:
PURPOSE: A diamond heat spreader and a manufacturing method thereof are provided to maximize heat conductivity by increasing a ratio of columnar particles which are horizontally arranged on a substrate. CONSTITUTION: The cross section of a diamond crystal structure has a radial columnar structure. Columnar particles are radially arranged on the radial columnar structure. Each radial columnar structure is grown around a seed point by a chemical vapor deposition process. The seed point is locally formed on the substrate. Diamond particles are separately arranged on the substrate. [Reference numerals] (AA) Radial columnar tissue; (BB) Diamond columnar particle; (CC) Grain boundary; (DD) Substrate; (EE) Seed point
Abstract:
PURPOSE: A cBN(cubic Boron Nitride) film and a manufacturing method thereof are provided to restrict harmful effects on the surface of nano-crystalline diamond and the residual stress applied to cBN by adding hydrogen in reactive gas and controlling the timing of hydrogen supply during synthesis of cBN. CONSTITUTION: A method for manufacturing a cBN film is as follows. A cBN film is formed on a nano crystalline diamond film through a PVD(Physical Vapor Deposition) process. In the PVD process, reactive gas supplied at the timing of film deposition is a mixed gas of Ar and N2. H2 is added to the reactive gas at a specific time after the film deposition.
Abstract:
PURPOSE: A ceramic body coated with a diamond film, and a manufacturing method thereof are provided to induce the strong mechanical bond between the ceramic body and the diamond film by forming uneven embossments. CONSTITUTION: A manufacturing method of a ceramic body coated with a diamond film comprises the following steps: forming a surface layer by spreading a mixture composition including ceramic particles and a matrix phase on the ceramic body; forming uneven embossments on the surface layer by removing the matrix phase; and adhering the diamond film on the surface layer. The surface layer contains 50~90% of ceramic particles. The surface layer is formed by a bonding reaction, a sintering reaction, or a crystallization reaction. The matrix phase is removed by a wet etching, a dry etching, or a sand blast.
Abstract:
PURPOSE: A process for growing single crystal diamond is provided to minimize the temperature difference between diamonds and minimize the temperature change by the plasma contact. CONSTITUTION: The pit(23) having the intaglio pattern corresponding to the mold substrate(21) to the crystalline morphology of the diamond seed(24) is formed. In the diamond seed, the growth is included in the pit of the mold substrate. The quick freeze part(22) controls the temperature of the mold substrate. The mold whole of the substrate is relatively uniformly contacted with the plasma(20). The intaglio pattern of the pit formed in the mold the inverted pyramid or the cubic shape. The diamond seed has the octahedron shape.
Abstract:
PURPOSE: A method for refining particle size of deposited diamond film, particularly, particle size of the edge of the cutting tool by consistently applying negative bias to the cutting tool from the outside in the diamond film deposition process is provided, and a diamond film deposited cutting tool used in the method is provided. CONSTITUTION: The method comprises the process of depositing a diamond film on a cutting tool matrix using vapor chemical deposition and applying a negative bias to the cutting tool so that a bias lower than other electrodes is impressed to the surface of the cutting tool from the outside at the same time, thereby coating on the surface of the tool a diamond film which has fine particle size on the edge compared to the central part of the tool. In a cutting tool on the surface of which diamond film is deposited using vapor chemical deposition, the diamond film deposited cutting tool is characterized in that a diamond film which has a micro particle size of 0.1 to 5 μm and has finer particle size on the edge compared to the central part of the same surface of the tool is coated on the surface of the tool by impressing a negative bias to the cutting tool so that a bias lower than other electrodes is impressed to the surface of the cutting tool from the outside at the same time as the diamond film is being deposited on the cutting tool.
Abstract:
PURPOSE: A planarizing and grinding method for a synthetic diamond wafer is provided to rapidly lap the synthetic diamond wafer without a pitting phenomenon, to planarize the diamond wafer without a grooving phenomenon and to planarize many wafers at the same time with a simple process. CONSTITUTION: A diamond wafer (1) is put on a graphite supporting stand (2) and contacted with alloyed plate materials (3,4). Plates (5,6) made from alumina, tungsten or molybdenum protect the diamond wafer from the other side of alloyed plate materials. After contacting an Mn-Fe alloy and the synthetic diamond wafer, the wafer is put into a furnace and heated at 750-1200deg.C under an argon atmosphere, an argon-hydrogen mixed gas atmosphere, a hydrogen gas atmosphere or a vacuum atmosphere to react the contact portion between the alloyed plate material and the diamond wafer.