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Recent trends that the sintered powder has applied to the machinery parts with magnetic characteristic have accelerated by the development of sintering process of the powder with the high density. The study is carried out to find the variation of the magnetic properties in 4 types of stainless steel powder. The excellent magnetic properties can be obtained from 400 series ferrite stainless steels, despide of relatively low sintering density of 6.8g/㎤, 434L satisfied the magnetic properties to be applied to ABS sensor ring in automotive, density and max permeability and high coercive force. The magnetic property of 410L was affected by a precipitation of carbide which was not shown in 434L series. However, several particles such as Cr₂O₃and Cr₂N were precipitated in alloy, 434LD2, of which has little effect on the magnetic properties. An increase of C content may result from a carburization by the remaining binder and the environment. In case of using cooling medium as nitrogen, the gas is required to inject at temperature lower than 500℃ to avoid nitration.
It is well known for ferritic stainless steel powder to applicate a sensor ring in anti-lock brake system of automobile, several studies, because of its excellent magnetic properties. This study was carried out to investigate the magnetic properties such as the maximum magnetic induction, coercivity and maximum permeability of the materials with functions of sintering density, time and temperature, and concluded as follows; 1.Both maximum magnetic induction value of 4700 Gauss and permeability of 200 were obtained at the maximum sintering density of 6.89g/cm3. Here, the properties showed a linear increasement with increasing the sintering density. 2.Coercivity sharply increased with incresing the sintering density and reached to 7.6 Oe at the maximum sintering density of 6.89g/cm3. 3.With increasing the sintering density, the temperature from 1140℃ to 1250℃ and the time from 30min to 60min, the maximum magnetic induction rate, coercivity and maximum permeability were increased simultaneously.
The purpose of this study is to characterize the internal physical properties of fresh Korean ginsengs (Panax ginseng C.A. Meyer) through a magnetic resonance imaging (MRI) technique. Current external visual inspection cannot determine internal quality of ginsengs successfully. Relaxation time constants, T_1 and T_2, were obtained from a series of MR images. Calculated T_1 values were varied with different physiological states of ginseng tissues. Internal imaging information was obtained nondestructively from fresh ginsengs. One-and two-dimensional image analysis were performed. One-dimensional image analysis showed a potential of age identification of ginsengs rapidly. Internal quality of normal and abnormal ginsengs was evaluated using two-dimensional MR images. Various types of internal defects such as internal cavity and rotten spot were visualized clearly. The MRI technique had a feasibility to detect internal defects of fresh ginsengs effectively.