자성유변유체용 분말 및 침강속도 측정기 제작에 관한 연구 = Powders Used for Magnetorheological Fluids and Manufacture of Sedimentation Speed Measurement System

다국어 초록 (Multilingual Abstract)

In order to confirm whether the gas-atomized Fe-Si powder is applicable for magnetorheological fluids (MR fluid), the Fe-Si powder was heat-treated and a device capable of measuring the sedimentation rate of the MR fluid was studied. When Fe-Si powder is heat-treated, coercive force decreases, but magnetic permeability and maximum magnetic moment also decrease, so there is no advantage compared to carbonyl iron powder. The TIA output, which is a key part, continuously increased due to the increase of the LED temperature. As a result of compensating the output voltage by measuring the LED temperature with an NTC thermometer, stable results were obtained over time, and the sedimentation rate meter was successfully manufactured.