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Magnetic properties of NdFeB-coated rubberwood composites
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作者 Jureeporn Noodam chitnarong sirisathitkul +2 位作者 Nirundorn Matan Watcharee Rattanasakulthong Pongsakorn Jantaratana 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第1期65-70,共6页
Magnetic properties of composites prepared by coating lacquer containing neodymium iron boron (Nd-Fe-B) powders on rubberwood were characterized by vibrating sample magnetometry (VSM), magnetic moment measurements... Magnetic properties of composites prepared by coating lacquer containing neodymium iron boron (Nd-Fe-B) powders on rubberwood were characterized by vibrating sample magnetometry (VSM), magnetic moment measurements, and attraction tests with an iron-core solenoid. The Nd-Fe-B powders were recycled from electronic wastes by the ball-milling technique. Varying the milling time from 20 to 300 min, the magnetic squareness and the coercive field of the Nd-Fe-B powders were at the minimum when the powders were milled for 130 rain. It followed that the coercive field of the magnetic wood composites was increased with the milling time increasing from 130 to 300 min. For the magnetic wood composites using Nd-Fe-B obtained from the same milling time, the magnetic squareness and the coercive field were rather insensitive to the variation of Nd-Fe-B concentration in coating lacquer from 0.43 to 1.00 g/cm3. By contrast, the magnetization and magnetic moment were increased with the Nd-Fe-B concentration increasing. Furthermore, the electrical current in the solenoid required for the attraction of the magnetic wood composites was exponentially reduced with the increase in the amount of Nd-Fe-B used in the coating. 展开更多
关键词 composite materials MAGNETS wood ball milling coatings MAGNETIZATION coercive field
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Phase investigations of manganese–bismuth alloyed in a microwave furnace
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作者 Panita THONGJUMPA Thanida CHAROENSUK +2 位作者 Upsorn BOONYANG Phimphaka HARDING chitnarong sirisathitkul 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第8期2220-2226,共7页
Implementation of manganese–bismuth(MnBi)alloys as high-performance permanent magnets is a challenge for physicists and engineers because the ferromagnetic low-temperature phase(LTP)is not exclusively obtained.In thi... Implementation of manganese–bismuth(MnBi)alloys as high-performance permanent magnets is a challenge for physicists and engineers because the ferromagnetic low-temperature phase(LTP)is not exclusively obtained.In this work,melting powered by four commercial magnetrons of 2000–2500 W in a microwave furnace is demonstrated as a new route to alloy MnBi.Under an argon atmosphere,microwave heating transferred to pieces of broken Bi ingots and Mn flakes for 2 h gave rise to products of inhomogeneous composition and morphology.Scanning electron micrographs were classified into three regions according to morphology and elemental composition.Cubic-like clusters characterized as Mn precipitated over light solidified Bi-rich regions,and the MnBi phase was formed in homogeneous regions with a balanced composition between Mn and Bi.A ferromagnetic hysteresis loop was obtained in the ground powder with a coercivity of 40 kA/m.Subsequent annealing at 553 K under a pressure of 414 kPa for 12 h enhanced the MnBi phase with extended regions of balanced composition.It follows that the coercivity was increased to 60 kA/m.However,remanent magnetization was slightly reduced.This MnBi alloyed by microwave radiation can be further used in rare-earth-free magnets. 展开更多
关键词 MICROWAVE MANGANESE BISMUTH scanning electron microscopy magnetic properties COERCIVITY
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Frequency-dependent magnetoelectricity of CoFe_2O_4-BaTiO_3 particulate composites
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作者 Atchara KHAMKONGKAEO Pongsakorn JANTARATANA +2 位作者 chitnarong sirisathitkul Teerapon YAMWONG Santi MAENSIRI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第11期2438-2442,共5页
CoFe2O4-BaTiO3 particulate composites were prepared by wet ball milling method,their magnetoelectric(ME) effect was studied as a function of their constituents and modulation frequency.The results show that the ME c... CoFe2O4-BaTiO3 particulate composites were prepared by wet ball milling method,their magnetoelectric(ME) effect was studied as a function of their constituents and modulation frequency.The results show that the ME coefficient increases as a function of modulation frequency from 400 to 1000 Hz and the ME characteristics of ME curves are also modified because the electrical conductivity of the CoFe2O4 phase is sensitive to the increase in frequency between 400 and 1 000 Hz.The third phase Ba2Fe2O5 formed during the sintering tends to reduce the ME effect. 展开更多
关键词 FERRITE FERROELECTRIC CoFe2O4-BaTiO3 magnetoelectric effect modulation frequency
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