| 초록 |
Among various soft magnetic magnetorhelogical (MR) materials, CI (Carbonyl Iron), Fe2O3 and Fe3O4 have been used as a magnetizable particles for the MR fluid due to its soft magnetical property and high magnetic permeability. However, light but weak magnetic saturation values of Fe2O3 and Fe3O4 and sedimentation stability of CI particle due to the large density mismatch with the medium oil such as Si-oil and water. However, the sedimentation of the Fe3O4 particles due to the large density mismatch with the medium oil as serious drawbacks. Therefore, considerable efforts such as investigating alternative material with low density and high magnetic saturation value like Sendust (consist of 83.9% Fe, 9.6% Si and 6.5% Al). And polymer coating technology have been made to improve the sedimentation stability. In this experiment, Sendust/PS particles were synthesized using MAA and fabricated through the polymer foaming technique and analyzed the magnetic properties by rheometer. |
