公开(公告)号：US20030111634A1

公开(公告)日：2003-06-19

申请号：US10015981

申请日：2001-12-10

Applicant: Delphi Technologies, Inc.

Inventor： Robert T. Foister ,  Vardarajan R. Iyengar ,  Sally M. Yurgelevic

IPC: H01F001/44

CPC classification number: H01F1/447

Abstract: A magnetorheological fluid formulation comprising magnetizable particles dispersed in a multi-component liquid vehicle comprising an organoclay stabilization mixture. At least one organoclay is selected for each liquid vehicle component, each organoclay having a surface chemistry that renders it preferentially compatible with the surface functionality of one of the liquid components relative to its compatibility to the remaining components whereby it is effective to stabilize, or gel, that component. A method of making an MR fluid is also provided in which liquid vehicle components are blended together, the organoclay mixture is added to the blend, and magnetizable particles are suspended therein, resulting in a stable MR fluid of suitable viscosity and yield stress.

Abstract translation: 一种磁流变液体制剂，其包含分散在包含有机粘土稳定混合物的多组分液体载体中的可磁化颗粒。 对于每种液体载体组分选择至少一种有机粘土，每种有机粘土具有表面化学性质，使其优先与其中一种液体组分的表面官能度相容，相对于其与其余组分的相容性，由此其有效稳定或凝胶 ，那个组件。 还提供了一种制备MR流体的方法，其中将液体载体组分混合在一起，将有机粘土混合物加入到共混物中，并将可磁化颗粒悬浮在其中，得到具有适当粘度和屈服应力的稳定的MR流体。

公开(公告)号：US20030102455A1

公开(公告)日：2003-06-05

申请号：US10292075

申请日：2002-11-12

Applicant: Delphi Technologies, Inc.

Inventor： Robert T. Foister ,  Vardarajan R. Iyengar ,  Sally M. Yurgelevic

IPC: H01F001/22

CPC classification number: H01F1/447

Abstract: An MR fluid formulation comprising water-atomized iron powder dispersed in a liquid vehicle, wherein the atomized iron powder contributes to a higher magnetic effect, a lower viscosity and suitability for high temperature applications. The magnetizable particles are prepared by controlled water atomization and comprise iron having a passivating oxide surface layer. The passivating oxide surface layer advantageously comprises iron oxide and at least one alloying metal oxide, such as manganese oxide. Advantageously, the particles have a grain size of at least 4 nullm and a mean diameter in the range of about 8-25 nullm. The liquid vehicle advantageously comprises a mixture of at least two liquid components of different surface functionality and an organoclay stabilization mixture in which at least one organoclay is selected for each liquid vehicle component. Exemplary MR fluid formulations of the present invention utilize a high-viscosity, low volatility base fluid, water-atomized iron powder, multi-component organoclays and multi-component additives to achieve the desired viscosity and durability of a fully formulated MR fluid which will satisfy the requirements of second and third generation MR fluids.

Abstract translation: 一种包含分散在液体载体中的水雾化铁粉末的MR流体配方，其中所述雾化铁粉有助于较高的磁效应，较低的粘度和对于高温应用的适用性。 可磁化颗粒通过受控的水雾化制备，并且包含具有钝化氧化物表面层的铁。 钝化氧化物表面层有利地包括氧化铁和至少一种合金化金属氧化物，例如氧化锰。 有利地，颗粒具有至少4μm的颗粒尺寸和约8-25μm的范围内的平均直径。 液体载体有利地包括至少两种不同表面官能团的液体组分和有机粘土稳定混合物的混合物，其中为每种液体载体组分选择至少一种有机粘土。 本发明的示例性MR流体配方利用高粘度，低挥发性基础流体，水雾化铁粉，多组分有机粘土和多组分添加剂来实现将满足的完全配制的MR流体的期望粘度和耐久性 第二代和第三代MR流体的要求。