Preparation of magnetic fluid having active-gas resistance and ultra-low vapor pressure for magnetic fluid vacuum seals

被引：29

作者：

Kanno, T ^{[1
]}

Kouda, Y ^{[1
]}

Takeishi, Y ^{[1
]}

Minagawa, T ^{[1
]}

Yamamoto, Y ^{[1
]}

机构：

[1] NOK Corp, Res Dept, Div Res & Dev, Tsukuba, Ibaraki 30042, Japan

来源：

TRIBOLOGY INTERNATIONAL | 1997年 / 30卷 / 09期

关键词：

magnetic fluid vacuum seal; perfluorinated magnetic fluid; active-gas resistance; ultra-low evaporative property;

D O I：

10.1016/S0301-679X(97)00060-1

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The magnetic fluid, having an ultra-low vapor pressure property of 7.0 x 10(-10) Pa at 293 K, was prepared. Hexafluoropropylene oxide polymer oil having high molecular weight was used as base oil. Magnetic particles were dispersed by using two types of new designed and synthesized hexafluoropropylene oxide acid derivative surfactants. The obtained magnetic fluid had a saturation magnetization of 35.0 mT, its magnetite particles were dispersed stably and showed a superior resistance to active gasses. It was ascertained that the magnetic fluid vacuum seal using the prepared fluid had the ultra high vacuum performance. (C) 1998 Elsevier Science Ltd.

引用

页码：701 / 705

页数：5