公开(公告)号：US3885007A

公开(公告)日：1975-05-20

申请号：US85583869

申请日：1969-09-08

Applicant: MC DONNELL DOUGLAS CORP

Inventor： OLSEN LARRY C ,  SCOTT HOWARD W

IPC: C04B35/536 ,  C01B31/00

CPC classification number: C04B35/536

Abstract: Improved uniformly expanded pyrolytic graphite, useful particularly as insulation material, e.g. heat insulator or heat shield, by a process comprising treating pyrolytic graphite with an intercalating agent, preferably a mixture of nitric and sulfuric acids, to cause the pyrolytic graphite to expand in a controlled manner only in the direction normal to the deposition surface (the c-direction) and continuing such treatment for a period sufficient to substantially completely delaminate the expanded pyrolytic graphite, and heating such delaminated expanded pyrolytic graphite under conditions constraining movement in the direction parallel to the deposition surface (the a-b direction) and permitting movement in the c-direction, to cause the delaminated expanded pyrolytic graphite to expand further to a controlled extent in the c-direction, forming an integral bonded expanded pyrolytic graphite expanded, e.g. from about 1 to about 10 times or more its original dimension in the c-direction.

Abstract translation: 改进的均匀膨胀的热解石墨，特别用作绝缘材料，例如， 绝热体或隔热层，通过包括用插层剂，优选硝酸和硫酸的混合物处理热解石墨，使热解石墨以受控的方式仅在垂直于沉积表面的方向（c 并且继续这种处理足以基本上完​​全分层膨胀的热解石墨的时间，以及在与沉积表面平行的方向（ab方向）上约束运动的条件下加热这种分层的膨胀热解石墨并允许c中的移动 导致分层扩张的热解石墨在c方向上进一步扩大到可控程度，形成膨胀的整体结合的膨胀热解石墨，例如 在c方向上的原始尺寸为约1至约10倍或更多。