公开(公告)号：KR100698727B1

公开(公告)日：2007-03-23

申请号：KR1020060070912

申请日：2006-07-27

Applicant: 자화전자(주)

Inventor： 김승호 ,  박성하 ,  강동완 ,  김효영 ,  홍성민 ,  김인호

IPC: C01B31/04 ,  C04B35/536

CPC classification number: C01B32/20 ,  C01B32/22 ,  C04B35/536

Abstract: A graphite sheet and a manufacturing method thereof are provided to manufacture a graphite sheet of a high thermal conductivity in a surface direction and in a thickness direction by mixing graphite of different expansion multiples together. A method for manufacturing a graphite sheet includes the steps of processing natural graphite with intercalate solution of which a concentration is controlled to be 20-80 times of an expansion multiple of expanded graphite, draining a surplus solution from the intercalate-processed natural graphite and washing the same, forming expanded graphite in the shape of worm by exposing the washed natural graphite to an increased temperature, wherein the graphite is expanded by 20-80 times of an original volume thereof, and forming a semi-anisotropic graphite sheet having a thermal anisotropic coefficient in the range from 3 to 20 by carrying out compression rolling molding for the expanded graphite.

Abstract translation: 提供石墨片及其制造方法，通过将不同膨胀倍数的石墨混合在一起，在表面方向和厚度方向上制造高导热性的石墨片。 一种制造石墨片的方法包括以下步骤：将天然石墨的加入浓度控制在膨胀石墨的膨胀倍数的20-80倍之内，从插层处理的天然石墨中排出多余的溶液并洗涤 通过将经洗涤的天然石墨暴露于升高的温度下形成蜗杆形状的膨胀石墨，其中石墨膨胀其原始体积的20-80倍，并且形成具有热各向异性的半 - 各向异性石墨片 通过对膨胀石墨进行压缩成型，其系数在3〜20的范围内。

公开(公告)号：KR100781628B1

公开(公告)日：2007-12-03

申请号：KR1020060064721

申请日：2006-07-11

Applicant: 자화전자(주)

Inventor： 김효영 ,  강동완 ,  김승호

IPC: H01M8/02

CPC classification number: H01M8/0221 ,  H01M8/0213 ,  H01M8/0226 ,  H01M2008/1095 ,  Y02E60/523 ,  Y02P70/56

Abstract: A method for preparing a graphite composite fuel cell separator and a graphite composite fuel cell separator prepared by the method are provided to reduce compression molding time remarkably and to improve electrical conductivity and flexural strength. A graphite composite fuel cell separator is prepared by using a graphite composite material prepared by dry mixing 70-95 wt% of a natural graphite powder and 5-30 wt% of a thermosetting resin powder uniformly to make a mixing material for a fuel cell separator; variably filling the mixing material into a mold where a separator channel is carved and compression molding it at a room temperature to prepare a molded product having a density of 90-100 % corresponding to the theoretical density; and thermosetting the molded product at 100-200 deg.C for 10-100 min.

Abstract translation: 提供了一种制备石墨复合燃料电池隔板和通过该方法制备的石墨复合燃料电池隔板的方法，以显着地减少压缩模塑时间并提高导电性和挠曲强度。 通过使用通过将70-95重量％的天然石墨粉末和5-30重量％的热固性树脂粉末均匀干混制成的石墨复合材料来制备石墨复合燃料电池隔板，以制备燃料电池隔板的混合材料 ; 将混合材料可变地填充到模具中，在其中雕刻隔板通道并在室温下将其压缩成型，以制备密度为理论密度的90-100％的模制产品; 并在100-200℃下热塑成型产品10-100分钟。