Characterization of an ultra-low vapor pressure ferrofluid

被引：10

作者：

Black, T

Raj, K

Tsuda, S

机构：

[1] Ferrotec USA Corp, Nashua, NH 03060 USA

[2] Ferrotec Corp, Tokyo 1100015, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2002年 / 252卷 / 1-3期

关键词：

magnetic fluid; ferrofluid; vapor pressure; vacuum; perfluoropolyethers; rotary shaft seals;

D O I：

10.1016/S0304-8853(02)00615-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A Perfluoropolyether (PFPE) based ferrofluid was characterized. The finished ferrofluid had the magnetization and viscosity values of 450 G and 9625 cP respectively at 27degreesC. It was found to have low volatility, long life, and stability under combined high temperature and magnetic field. These properties qualify the material for use in bakeable magnetic fluid seals for clean UHV environments. A novel method was used to measure the vapor pressure of the ferrofluid as a function of time and temperature. The room temperature vapor pressure of the subject ferrofluid was measured as 3 x 10(-10) mmHg after 1 h of exposure to high vacuum. It decayed to 3 x 10(-11) mmHg after 5 h and 3 x 10(-12) mmHg after 450 h. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：39 / 42

页数：4