Abstract: Disclosed herein is a method for preparing ultrafine titanium carbonitride powder under a relatively low temperature condition that obviates a grinding process. This method includes the steps of: a mixing step for contacting titanium dioxide (TiO2), calcium (Ca) and carbon (C) under an inert atmosphere, a synthesis step for reacting the resultant mixture by heating at a temperature of about 600-1500° C. or lower under a nitrogen atmosphere; and a washing step for removing calcium oxide by washing this mixture.

Abstract: Disclosed herein is a method for preparing ultrafine titanium carbonitride powder under a relatively low temperature condition that obviates a grinding process. This method includes the steps of: a mixing step for contacting titanium dioxide (TiO2), calcium (Ca) and carbon (C) under an inert atmosphere, a synthesis step for reacting the resultant mixture by heating at a temperature of about 600-1500° C. or lower under a nitrogen atmosphere; and a washing step for removing calcium oxide by washing this mixture.

Abstract: The present invention relates to an economically excellent method for manufacturing ultra fine tungsten carbide-cobalt composite powder having tungsten compound and cobalt compound as its raw material. More particularly, the present invention provides a manufacturing method comprising a process for mixing tungsten compounds, cobalt compounds, grain-grown inhibitor compounds and oxide in a mechanical method, a calcination process for removing ammonia and moisture of the mixed powder and forming it into an composite oxide, a reduction process for manufacturing said calcined powder into pure metal powder, a mixing process for adding carbon source to said reduced powder, and a carburization process for manufacturing the mixed powder into a tungsten carbide-cobalt composite powder, which is the final form. Using the manufacturing method of the present invention, ultra-fine tungsten carbide-cobalt composite powder having an ultra-fine particle size of 0.1˜0.2 ?m, 0.2˜0.3 ?m,0.3˜0.

Abstract: Disclosed is a method of manufacturing a laminated polar anisotropic hybrid magnet, which includes separately mixing first permanent magnet powders having low magnetic properties and second permanent magnet powders having high magnetic properties with a thermoplastic resin to prepare first and second compound pellets, respectively, and firstly injecting the first compound pellets by use of a first injection mold, to prepare a polar anisotropic and anisotropic resin magnet, which is then placed into a second injection mold having an outer diameter lager than that of the first mold, followed by secondly injecting in a magnetic field together with the second compound pellets. The manufacturing method of the current invention is advantageous in terms of exhibition of higher magnetic properties of the laminated polar anisotropic hybrid magnet, and reduction of the use of expensive materials, thus generating economic benefits.

Abstract: The present invention relates to an economically excellent method for manufacturing ultra fine tungsten carbide-cobalt composite powder having tungsten compound and cobalt compound as its raw material. More particularly, the present invention provides a manufacturing method comprising a process for mixing tungsten compounds, cobalt compounds, grain-grown inhibitor compounds and oxide in a mechanical method, a calcination process for removing ammonia and moisture of the mixed powder and forming it into an composite oxide, a reduction process for manufacturing said calcined powder into pure metal powder, a mixing process for adding carbon source to said reduced powder, and a carburization process for manufacturing the mixed powder into a tungsten carbide-cobalt composite powder, which is the final form. Using the manufacturing method of the present invention, ultra-fine tungsten carbide-cobalt composite powder having an ultra-fine particle size of 0.1˜0.2 ?m, 0.2˜0.3 ?m, 0.3˜0.

Abstract: Disclosed is a method of manufacturing a laminated polar anisotropic hybrid magnet, which includes separately mixing first permanent magnet powders having low magnetic properties and second permanent magnet powders having high magnetic properties with a thermoplastic resin to prepare first and second compound pellets, respectively, and firstly injecting the first compound pellets by use of a first injection mold, to prepare a polar anisotropic and anisotropic resin magnet, which is then placed into a second injection mold having an outer diameter lager than that of the first mold, followed by secondly injecting in a magnetic field together with the second compound pellets. The manufacturing method of the current invention is advantageous in terms of exhibition of higher magnetic properties of the laminated polar anisotropic hybrid magnet, and reduction of the use of expensive materials, thus generating economic benefits.

Abstract: The present invention provides a method of winding an armature coil on a cylindrical resin insulator of coreless motors while improving magnetic flux efficiency of the coil. This method allows a resulting motor to effectively generate desired torque by an application of a low current, thus conserving electricity. This method also simplifies the production process of the coreless motors, thus reducing the production cost of the motor and improving productivity and economical efficiency of the motors. In order to wind an armature coil on an insulator, the coil is repeatedly wound on the insulator, with each turn of the coil linearly extending on the upper surface, vertically extending down on the sidewall and linearly extending on the lower surface prior to vertically extending up on the sidewall of the insulator.