Magneto-rheological fluids
Magnetorheological fluids are stable suspensions of magnetically polarisable micron sized particles suspended in a low volatility carrier fluid, usually a synthetic hydrocarbon. Liquids Research Limited produce magneto-rheological fluids that are capable of giving high shear stresses at low applied magnetic fields. The unique nature of this class of magnetic fluid allows dramatic changes in rheology to occur within the bulk of the fluid on application of a relatively modest magnetic field.
The material can change from being fluid to solid almost instantaneously, the rheology of the material reverting to its original state upon removal of the field.
| Properties | Value |
|---|---|
| Operating Temperature | -40°C to 140°C |
| Density | 2.49 g/cc (A) 3.08 g/cc (B) |
| Colour | Grey |
| Packing fraction by weight | 70% (A), 80% (B) |
| Flash point | 190°C (A and B) |
| Rheology | Please contact us for details |
| Fluid No. | % Packing | Carrier Oil | Viscosity |
|---|---|---|---|
| MRHCCS4-A | 70 | Hydrocarbon | thixotropic |
| MRHCCS4-B | 80 | Hydrocarbon | thixotropic |
Magnetorheological fluids have existed for over fifty years. However, it is only now that fluids are available that are stable and give shear stresses that are adequate in demanding applications such as automotive damping. Liquids Research Limited produce thixotropic magneto-rheological fluids that are suitable for applications where high shear stresses are required, these applications include seat suspensions, vehicle suspension systems and exercise equipment.
Current applications for magnetic liquids include:
- Rotary shaft seals for computer disk drives
- Rotary shaft seals for vacuum systems
- Rotary shaft seals for chemicals, gases and radioactive materials
- Bearing protection from abrasive environments
- Loudspeaker performance enhancement
- Magnetic separation of materials
- Domain observation
- Ink jet printing
- Stepper motor dampers
- Optical switches
- Inclinometers
- Cell labelling
Liquids Research and You
A Technology Partnership Liquids Research Ltd produce magnetorheological fluids for a broad range of light and heavy duty engineering applications. We have many years experience on the ormulation of magnetorheological fluids and together with our customers in the automotive and other sectors are working together to bring magnetorheological fluids into the 21st century. e welcome collaborations with our customers to produce a magnetorheological fluid solution for your vibration control and damping applications.
Liquids Research Limited can tailor make products to clients individual specifications.
