公开(公告)号：US20020130305A1

公开(公告)日：2002-09-19

申请号：US09805084

申请日：2001-03-13

Applicant: Delphi Technologies, Inc.

Inventor： Vardarajan R. Iyengar ,  Robert T. Foister ,  James C. Johnson

IPC: H01B003/24

CPC classification number: C10M171/001

Abstract: A magnetorheological fluid formulation exhibiting consistently high yield stress during use. The MR fluid comprises martensitic or ferritic stainless steel particles prepared by a controlled water or inert gas atomization process. The stainless steel particles are resistant to corrosion and oxidation, are generally smooth and spherical, and maintain their shape and size distribution throughout their use under an applied magnetic field.

Abstract translation: 在使用期间表现出一致的高屈服应力的磁流变流体配方。 MR流体包括通过受控的水或惰性气体雾化过程制备的马氏体或铁素体不锈钢颗粒。 不锈钢颗粒耐腐蚀和氧化，通常是光滑和球形的，并且在施加的磁场下在其使用期间保持其形状和尺寸分布。

公开(公告)号：US20030057395A1

公开(公告)日：2003-03-27

申请号：US09961217

申请日：2001-09-21

Applicant: Delphi Technologies, Inc.

Inventor： Vardarajan R. Iyengar ,  Robert T. Foister

IPC: H01F001/22

CPC classification number: H01F1/447

Abstract: A magnetorheological fluid formulation in which the base liquid is optimized to exhibit an acceptable viscosity, a low volatility, improved low temperature flow properties, and an improved elastomeric compatibility. The fluid formulation includes a base liquid containing a mixture of 1-dodecene polyalphaolefin and a diester, such as dioctyl sebacate. The diester is added to the mixture in an amount effective to produce seal swelling and to lower the pour point. The viscosity of the fluid formulation is suitable for diverse vibration damping applications that require a vibration damping device to operate in the temperature range of about null40null C. to about 100null C. The low volatility and seal swelling properties of the fluid formulation reduce, inhibit or eliminate fluid loss about the seals of the vibration damping device.

Abstract translation: 磁流变流体配方，其中基础液体被优化以显示可接受的粘度，低挥发性，改善的低温流动性能和改进的弹性体相容性。 流体配方包括含有1-十二烯聚α-烯烃和二酯的混合物的基础液体，例如癸二酸二辛酯。 将二酯以有效产生密封膨胀并降低倾点的量加入混合物中。 流体配方的粘度适用于需要减振装置在约-40℃至约100℃的温度范围内操作的各种减振应用。流体配方的低挥发性和密封性膨胀特性降低 ，抑制或消除围绕减震装置的密封件的流体损失。

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。