scholarly journals Sintering of Soft Magnetic Material under Microwave Magnetic Field

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Sadatsugu Takayama ◽  
Jun Fukushima ◽  
Junichi Nishijo ◽  
Midori Saito ◽  
Saburo Sano ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Microwave Sintering ◽  
Power Level ◽  
Single Mode ◽  
Sintered Sample ◽  
Soft Magnetic Materials ◽  
Soft Magnetic Material ◽  
Soft Magnetic ◽  
Microwave Magnetic Field

We have developed a simple process for sintering of soft magnetization materials using microwave sintering. The saturated magnetization (Ms) of sintered magnetite was 85.6 emu/g, which was as high as 95% of magnetite before heating (90.4 emu/g). On the other hand, the averaged remanence (Mr) and coercivity (Hc) of the magnetite after heating were 0.17 emu/g and 1.12 Oe under measuring limit of SQUID, respectively. For the sintering process of soft magnetic materials, magnetic fields of microwave have been performed in nitrogen atmosphere. Therefore, a microwave single-mode system operating at a frequency of 2.45 GHz and with a maximum power level of 1.5 kW was used. We can sinter the good soft magnetic material in microwave magnetic field. The sample shrank to 82% theoretical density (TD) from 45%TD of green body. The sintered sample was observed the microstructure by TEM and the crystal size was estimated the approximate average size is 10 nm.

Soft Magnetic Material Testing Using Magnetic Resonance Imaging

2013 ◽  
Vol 740 ◽  
pp. 618-623 ◽  
Author(s):  
Ivan Frollo ◽  
Peter Andris ◽  
Jiri Pribil ◽  
Tomas Dermek ◽  
Daniel Gogola
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Field ◽  
Magnetic Material ◽  
Magnetic Resonance ◽  
Material Testing ◽  
Soft Magnetic Material ◽  
Resonance Imaging ◽  
Soft Magnetic ◽  
Imaging Methods ◽  
Field Samples

Soft magnetic field samples were placed into the homogenous magnetic field of an imager based on nuclear magnetic resonance. Several samples made of a soft magnetic material (cut from a data disc) were tested. Theoretical computations on a magnetic double layer were performed. For experimental verification an MRI 0.178 Testa ESAOTE Opera imager was used. For our experiments a homogeneous circular holder (reference medium) - a container filled with doped water - was designed. The resultant image corresponds to the magnetic field variations in the vicinity of the samples. For data detection classical gradient-echo and spin-echo imaging methods, susceptible to magnetic field inhomogeneities, were used. Experiments proved that the proposed method is perspective for soft magnetic material testing using magnetic resonance imaging methods (MRI).

Design of Composite Electromagnetic Wave Absorber Made of Soft Magnetic Materials Dispersed and Isolated in Polystyrene Resin

2008 ◽  
Vol 388 ◽  
pp. 257-260 ◽  
Author(s):  
Kenji Sakai ◽  
Yoichi Wada ◽  
Shinzo Yoshikado
Keyword(s):  
Magnetic Material ◽  
Electromagnetic Wave ◽  
Magnetic Materials ◽  
Soft Magnetic Materials ◽  
Soft Magnetic Material ◽  
Complex Permeability ◽  
Frequency Range ◽  
Soft Magnetic ◽  
Mixture Ratio ◽  
Polystyrene Resin

Composite electromagnetic wave absorbers made of a soft magnetic material (permalloy or sendust) and polystyrene resin were investigated [1]. The volume mixture ratio of magnetic material was varied in the range from 18 vol% to 75 vol%. The composites with the low volume mixture ratio of soft magnetic material absorbed more than 99 % of electromagnetic wave power in the frequency range from 1 GHz to 10 GHz. The values of the real part r’ of the relative complex permeability r * for both magnetic materials were less than unity at frequencies above approximately 6 GHz as the volume mixture ratio of magnetic material increased. This result suggests the possible realization of an electromagnetic wave absorber that can operate above 10 GHz.

The Development of Permanent Strong Magnets and its Application in the Deironing of Kaolin

2012 ◽  
Vol 217-219 ◽  
pp. 690-694
Author(s):  
Gui Wu Fu ◽  
Jun Liu ◽  
Yu Hua Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Field Strength ◽  
Permanent Magnet ◽  
Chemical Industry ◽  
Soft Magnetic Material ◽  
Soft Magnetic ◽  
Permanent Magnetic Field ◽  
Iron Mineral ◽  
The Magnetic Field

This paper considered that putting the specialized soft magnetic material in the permanent magnetic field with a particular structure and the magnetic field strength can make it be magnetized, finally the surface of the soft magnetic material will produce twice strength than that of original permanent magnetic field. And we made a analysis for said phenomenon. We introduce d the deironing machines of permanent magnet strong magnet and high-gradient permanent magnet which are manufactured based on this principle. They can effectively remove the iron mineral of "kaolin" and its principles and structure is simple but it has the advantages of high efficiecy, energy saving, environmental protection. So it provides important references to chemical industry, ceramics and other industries which apply kaolin technologies.

Iron-Based P/M Soft Magnetic Material for Electric Devices Operating at High Frequencies

2007 ◽  
pp. 1333-1336
Author(s):  
Tomoyuki Ishimine ◽  
Toru Maeda ◽  
Haruhisa Toyoda ◽  
Kouji Mimura ◽  
Takao Nishioka ◽  
...  
Keyword(s):  
Magnetic Material ◽  
Soft Magnetic Material ◽  
Soft Magnetic ◽  
High Frequencies ◽  
Iron Based
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