Korea Advanced Institute of Science and Technology

Hyundai Motor Company

Kia Motors Corporation

Samsung Heavy Ind. Co., Ltd

Samsung Electro-mechanics Co., Ltd.

Dai Gil Lee

Jung Do Suh

Ha Na Yu

Sae Hoon Kim

Byung Ki Ahn

Jun Woo Lim

Jong Woon Kim

Hak Sung Kim

Seong Su Kim

Byoung Chul Kim

Seung Hwan Chang

Bu Gi Kim

Seong Min Lee

Duck Whan Kim

Young Bum Kum

Kwi Seong Jeong

Sung Keun Lee

Sang Hyun Cho

Jae Wook Kwon

Haeng Jin Ko

Young Woo Noh

Jin Kook Kim

Byung Chul Kim

Junghan Yu

Sung Su Kim

Hyoung Geun Kim

Dong Chang Park

Kyung Kun Bang

Sung Ho Lee

Jun Kun Choi

Sang Wook Park

Sang Won Kim

Tae Won Lim

Seuk Hwan Chung

Dae Lyun Kang

Seong Geun Kim

Hui-Yun Hwang

Jin-Kook Kim

Young-So Yoon

In Uk Hwang

Sang-Kon Kim

Ae Kwon Yoo

Woo Seok Chin

Kyung Geun Bang

Seong Sik Cheon

Jin Kyung Choi

Durk Hyun Cho

Po Jin Kim

Je Hoon Oh

The present invention provides a method for manufacturing a composite separator for a polymer electrolyte membrane fuel cell. The method comprises: preparing a prepreg as a continuous carbon fiber-reinforced composite and a graphite foil; allowing the cut prepreg and graphite foil to pass through a stacking/compression roller to be compressed; allowing the prepreg in which the graphite foil is integrally stacked to be heated and pressed by a hot press such that hydrogen, air, and coolant flow fields are formed or to pass through a hot roller to be formed into a separator; removing unnecessary portions from the heated and pressed separator using a trim cutter; and post-curing the thus formed separator, wherein the graphite foil may be stacked on the prepreg as the continuous carbon fiber-reinforced composite such that a graphite layer is integrally formed with the prepreg.

Composite separator for polymer electrolyte membrane fuel cell and method for manufacturing the same

The present invention provides a composite separator for a polymer electrolyte membrane fuel cell (PEMFC) and a method for manufacturing the same. The inventive method involves allowing graphite foil layers to be brought into direct contact with each other when graphite foils are stacked on both sides of a carbon fiber reinforced composite material prepreg, thereby improving electrical conductivity in the thickness direction of the separator.

The present invention provides a composite separator for a polymer electrolyte membrane fuel cell (PEMFC) and a method for manufacturing the same, in which a graphite foil prepared by compressing expanded graphite is stacked on a carbon fiber-reinforced composite prepreg or a mixed solution prepared by mixing graphite flake and powder with a resin solvent is applied to the cured composite prepreg such that a graphite layer is integrally molded on the outermost end of the separator. For this purpose, the present invention provides a method for manufacturing a composite separator for a polymer electrolyte membrane fuel cell, the method including: preparing a prepreg as a continuous carbon fiber-reinforced composite and a graphite foil; allowing the cut prepreg and graphite foil to pass through a stacking/compression roller to be compressed; allowing the prepreg in which the graphite foil is integrally stacked to be heated and pressed by a hot press such that hydrogen, air, and coolant flow fields are formed or to pass through a hot roller to be formed into a separator; removing unnecessary portions from the heated and pressed separator using a trim cutter; and post-curing the thus formed separator, wherein the graphite foil may be stacked on the prepreg as the continuous carbon fiber-reinforced composite such that a graphite layer is integrally formed with the prepreg.

The present invention provides a method for manufacturing a composite separator for a fuel cell, which can reduce the electrical contact resistance by performing an additional post-treatment to remove residual resin remaining on the surface of the composite separator by plasma etching. In certain preferred embodiments, the present invention provides a method for manufacturing a composite separator for a fuel cell, in which a liquid phase resin for gasket is applied to the surface of the composite separator along a predetermined gasket pattern, or a semi-cured resin for gasket in the form of a film with a predetermined gasket pattern is stacked on the surface of the composite separator, and then plasma etching is performed to remove the residual resin and, at the same time, cure the resin for gasket, thus reducing the overall processing time to improve the productivity and preventing a composite material of the separator from being damaged.

Method for manufacturing composite separator for fuel cell and composite separator manufactured by the same

The present invention features a fuel cell stack that preferably includes an electricity generating assembly having a plurality of unit cells that are suitably disposed one after another; a pair of end plates pressedly disposed respectively at upper and lower ends of the electricity generating assembly; and a joining device suitably engaging the end plates by a rope, where pressure is applied to the electricity generating assembly by means of tension of the rope, and the length and tension of the rope is suitably controlled.

Joining device for fuel cell stack and fuel cell stack provided with the same

The object of this invention is to provide a hybrid composite journal bearing which is constructed so that a composite liner is positioned on an inner surface of a metal housing having a circular cross-section, thus preventing a journal from being broken or damaged or seized to the bearing, due to friction between the metal or composite journal and the journal bearing. The hybrid composite journal bearing () includes a metal housing () which is secured on an outer surface thereof to a bearing system and has a circular cross-section. A composite liner () is laminated to an inner surface of the metal housing () with a uniform thickness so as to minimize friction between the journal bearing and a journal.

Hybrid composite journal bearing and manufacturing method thereof

The present invention provides a fuel cell separator formed of a continuous carbon-fiber composite, and a method for manufacturing the same.

Fuel cell separator and method for manufacturing the same

The object of this invention is to provide a hybrid composite journal bearing which is constructed so that a composite liner is positioned on an inner surface of a metal housing having a circular cross-section, thus preventing a journal from being damaged or seized to the bearing, due to friction between the metal or composite journal and the journal bearing. The hybrid composite journal bearing () includes a metal housing () which is secured on an outer surface thereof to a bearing system and has a circular cross-section. A composite liner () is laminated to an inner surface of the metal housing () with a uniform thickness so as to minimize friction between the journal bearing and a journal.

A vibration actuator excites a mass member by interaction between an electric field of a vibration coil provided in an inner space of a case and a magnetic field of a magnetic field unit disposed corresponding to the vibration coil. The vibration actuator has an elastic wire having a wire body fixed to the outer surface of the mass member and elastic ends fixed to the inner surface of the case. The elastic wire is connected between the case and the mass member for elastically supporting mass member.

Vibration actuator

A bearing assembly includes a spherical journal and a hemispherical bearing that is made of a fiber reinforced composite and has a bearing surface for establishing a spherical pair with the spherical journal. The fiber reinforced composite can be constructed by arranging a uni-directional prepreg, woven fiber prepregs and staple-fiber prepregs in a variety of configurations, and thermoplastic resin particles or self-lubrication particles are uniformly provided on the bearing surface. It is possible to alleviate stress concentration generated on the bearing surface by forming a plurality of air channels capable of imparting directivity on an outer surface of the hemispherical bearing.

Bearing assembly and method for manufacturing the same

The present invention discloses a bearing assembly capable of assuring mechanical strength and reducing a friction coefficient and stress concentration, and a method for manufacturing the same. The present invention comprises a spherical journal and a hemispherical bearing that is made of a fiber reinforced composite and has a bearing surface for establishing a spherical pair with the spherical journal. The fiber reinforced composite can be constructed by arranging a uni-directional prepreg, woven fiber prepregs and staple-fiber prepregs in a variety of configurations, and thermoplastic resin particles or self-lubrication particles are uniformly provided on the bearing surface. It is possible to alleviate stress concentration generated on the bearing surface by forming a plurality of air channels capable of imparting directivity on an outer surface of the hemispherical bearing.

The present invention is to provide a machining tool bar in which mechanical machining properties are improved by using high stiffness composite material. According to the present invention, the tool bar includes an adaptor constructed to be coupled to a driving device, a body constructed to be mounted with cutting tools and a tip constructed to be supported by a workpiece, said body is constructed to be mounted with one or more cutting tools, wherein the adaptor and tip are made of metal material, the body is made of composite material having high stiffness, the composite material constructing the body is formed to surround at least a portion of the adaptor and at least a portion of the tip, and the metal material constructing the adaptor and tip and the composite material constructing the body are securely joined to each other in an interface therebetween.

High stiffness composition tool bar

The propeller shaft comprises a transmission shaftconsisting of a hollow metal tubewith excellent torque transmissibility and a composite material prepregshaving higher specific stiffness than a metal material and stacked to the inner surface of the metal tube, and metal yokesmounted on both ends of the transmission shaft and assembled with other devices. The composite material prepregs is co-cure bonded while applying an axial compressive preload to the transmission shaft and creating a vacuum in a space between a vacuum bag inserted in the transmission shaft and the composite material prepregs of the transmission shaft. Teethor embossmentsand adhesive-retaining groovesare formed on inner surfaces of the metal yokes, so the transmission shaft is desirably compression-fitted into the metal yokes. Accordingly, the propeller shaft has advantages of securing improved impact, abrasion, and water resistance.

Hybrid propeller shaft made of metal and composite material and method of manufacturing the same

Growing community of inventors

Daejeon, South Korea

Dai Gil Lee