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Heat generation properties in AC magnetic field for composite powder material of the Y3Fe5O12-nSiC system prepared by reverse coprecipitation method

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Journal of Advanced Ceramics 2016年第3期5卷 262-268页

作者： Hiromichi AONO Yuhi YAMANO Takashi NAOHARA Yoshiteru ITAGAKI Tsunehiro MAEHARA hideyuki hirazawa Graduate School of Science and Engineering Ehime University Matsuyama 790-8577 Japan National Institute of Technology Niihama College Niihama 792-8580 Japan

Composite powder material of the Y3Fe5O12–nSiC system was synthesized by a reverse coprecipitation method to study its heat generation property in an AC magnetic field. For Y3Fe5O12 (n = 0), the maximum heat generation ability of 0.45 W·g−1 in an AC magnetic field (370 kHz, 1.77 kA·m−1) was obtained for the sample calcined at 1100 °C. The SiC addition helped to suppress the particle growth for Y3Fe5O12 at the calcination temperature. The heat generation ability was improved by the addition of the SiC powder, and the maximum value of 0.93 W·g−1 was obtained for the n = 0.3 sample calcined at 1250 °C. The heat generation ability and the hysteresis loss value were proportional to the cube of the magnetic field (H 3). The heat generation ability (W·g−1) of the Y3Fe5O12–0.3SiC sample calcined at 1250 °C could be expressed by the equation 4.5×10−4 · f · H 3 using the frequency f (kHz) and the magnetic field H (kA·m−1).

关键词： magnetic materials composite material Y3Fe5O12 SiC heat generation ability AC magnetic field

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Heat Generation Properties in AC Magnetic Field for Ferrimagnetic R_3Fe_5O_(12) (R=Y,Sm,Gd,Dy,Ho,Er) Powder Materials Synthesized by Reverse Coprecipitation Method

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Journal of Iron and Steel Research International 2012年第S1期19卷 600-603页

作者： Tadahiko NISHIMORI Takashi NAOHARA Tsunehiro MAEHARA hideyuki hirazawa Hiromichi AONO Graduate School of Science and Engineering Ehime UniversityMatsuyama 790-8577Japan Department of Environmental Materials Engineering Niihama National College of Technology

R_3Fe_5O_(12)(R=Y,Sm,Gd,Dy,Ho,Er)powders synthesized by a reverse coprecipitation method were investigated for their heat generation ability in an AC magnetic *** heat generation ability in an AC magnetic field was strongly influenced by the particle size,i.e.,calcination temperature of the *** highest heat generation ability was obtained for the Y_3Fe_5O_(12)sample calcined at 1100 ℃.The heat generation ability(W.g^(-1))can be estimated using a 3.6× 10^(-4)fH^3(frequency(flkHz)and the magnetic field(H/kA·m^(-1)))for the Y_3Fe_5O_(12)sample calcined at 1100 ℃.

关键词： heat generation AC magnetic field ferrite powder

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Improvement of Heat Generation Ability in AC Magnetic Field and Magnetic Properties for Spinel Type MgFe_2O_4 Ferrite by Cu Substitution and Beads Milling

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Journal of Iron and Steel Research International 2012年第S1期19卷 596-599页

作者： hideyuki hirazawa Hiromichi AONO Takashi Naohara Tsunehiro MAEHARA Yuji WATANABE Department of Environmental Materials Engineering Niihama National College of TechnologyNiihama 792858 0 EhimeJapan Graduate School of Science and Engineering Ehime UniversityMatsuyama 790857 7Ehime Japan Department of Organ Regenerative Surgery Ehime UniversityToon 791029 5EhimeJapan

Mg_(1-X)Cu_XFe_2O_4 type spinel ferrite was prepared by solid reaction method in order to discuss the heat generation ability in AC magnetic *** cubic type ferrite structure was obtained for X=0-0.6 samples calcined at 1200℃,and the mixture phase of cubic and tetragonal structures were obtained for X=0.7,0.8 samples from XRD result. The highest lattice parameter and highest hysteresis loss value were also shown at X=0.6 sample,the crystal distortion was increased with increase the Cu^(2+)substitution in cubic type ferrite *** sized nano Mg_(0.4)Cu_(0.6)Fe_2O_4 powder was prepared by physical milling method using beads *** highest heat generation in the AC magnetic field was obtained for the 6 h milled samples using 0.1mm *** Cu^(2+)substitution for MgFe_2O_4 ferrite and the beads milling were very effective for the improvement of their heat generation ability in AC magnetic field.

关键词： heat generation ability AC magnetic field spinel ferrite beads milling

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High-Frequency Induction Heating of Needle-Shaped Mg-Ferrite for Ablation Therapy of Human Cancer

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Journal of Iron and Steel Research International 2012年第S2期19卷 735-738页

作者： NAOHARA Takashi AONO Hiromichi MAEHARA Tsunehiro hirazawa hideyuki MATSUTOMO Shinya WATANABE Yuji Graduate School of Science and Engineering Ehime University Department of Environmental Materials Engineering Niihama National College of Technology Department of Electronic Control Engineering Niihama National College of Technology Department of Surgery Graduate School of MedicineEhime University

For application as a novel ablation therapy of human cancer,the heating property of a needle-shaped Mg-ferrite prepared by a sintering technique was studied in a high-frequency induction field at 370 *** inserted into cylindrical clay,the increase in temperature(Δ7)was 31.2℃ for the specimen with a 1.5 mm diameter,while the 1.0mm diameter specimen exhibited a ΔT value of 15.7℃ after the induction time of *** ΔT exhibited a high value of 57.9℃ during the simultaneous insertion of 3 1.5mm diameter *** the computer simulation images, the relatively lower magnetic flux density and concurrent neghgibly low current density were observed from the surface to the internal regions,being different from the behavior of a ferromagnetic Ni-rod with the same size.

关键词： high-frequency induction heating cancer therapy ablation treatment eddy current loss residual loss

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