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Effect of Heat Treatment on Structure and magnetic performance of Ni-Fe-P Alloy Obtained by Electroless Plating

Chemical Research in Chinese Universities 2005年第6期21卷 718-722页

作者： WANG Sen-lin ZHANG Yong College of Materials Science and Engineering ChinaCollege of Information Science and Engineering Huaqiao University Quanzhou 362021 P. R.China

The electroless deposition of Ni68-Fe10.5-P21.5 alloy has been investigated. The crystallization behavior of the deposit was comparatively studied by using differential scanning calorimetry and X-ray diffractometry. The deposit transforms into a square Ni3P phase at 380. 0 ℃, then changes into a cubic FeNi3 phase at 490. 0 ℃. The microhardness, the size of the formed grains and the magnetic performance of the deposit increase with the increase of the heat treatment temperature below 500 ℃, then they decrease after this temperature. The effect of heat treatment time at 500 ℃ on the surface micromorphology, the structure and the magnetic performance of the deposit were also studied. The resuits show that with the increase of heat treatment time, the extent of crystallization of the deposit increases and the size of the formed grains becomes uniform. The results also show that the magnetic performance of the deposit under heat treatment for 40 min is maximal and then decreases with the increase of heat treatment time. The property change of the deposit is related to the crystal structure and the size of the formed grains of the deposit.

关键词： Electroless plating Ni-Fe-P alloy Heat treatment magnetic performance

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Crystal structures and magnetic performance of nanocrystalline Sm-Co compounds

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Frontiers of Materials Science 2012年第3期6卷 207-215页

作者： Xiao-Yan SONG Zhe-Xu ZHANG Nian-Duan LU Hai-Ning LIANG Ding-Peng LI Xiang-Quan YAN Jiu-Xing ZHANG College of Materials Science and Engineering Key Laboratory of Advanced Functional Materials(Ministry of Education)Beijing University of TechnologyBeijing 100124China

A variety of intermetallic compounds in the binary Sm Co system were reviewed, and the contents were focused on the crystal structures, magnetic properties and the nanoscale effects. The representative nanocrystalline Sm-Co compounds were introduced in details, the diagrams for their lattice structures and the atomic sites and occupancies were provided. Moreover, the magnetic properties of the nanocrystalline Sm-Co compounds were compared with those of the conventional polycrystalline counterparts. It showed that the nanocrystalline Sm Co compounds exhibit special phase stability and remarkably enhanced magnetic performance, which are promising candidates for the matrix phases to develop permanent magnets, particularly the advanced high-temperature magnetic materials.

关键词： Sm-Co compounds nanoscale crystal structure magnetic performance

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Microstructure and magnetic performance of Ni-substituted high density MnZn ferrite

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Rare Metals 2006年第Z1期25卷 584-587页

作者： YU Zhong LAN Zhongwen CHEN Shengming SUN Yueming SUN Ke State Key Laboratory of Electronic Thin Films and Integrated Devices UESTCChengdu 610054China Jiangsu Research Center of magnetic Materials and Devices Engineering and Technology Wuxi 214199China

The effects of NiO on microstructure and magnetic properties of Mn-Zn ferrite with a nominal composition of Zn_(0.32)Mn_(0.60-x)Ni_(x)Fe_(2.08)O_(4)were *** calcined powder of Mn-Zn ferrite was characterized by X-ray diffraction(XRD),the fracture surface of Mn-Zn ferrite was checked by scanning electronic microscope(SEM),and then the magnetic properties were *** a result,the substitution of Ni can cause the crystal lattice constant of MnZn ferrite to decline,and the grain size to decrease,therefore improve the magnetic performance of MnZn ferrite whose density exceeds 5.0 g·cm^(-3).

关键词： MnZn ferrite Ni-substitution microstructure magnetic performance

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EFFECT OF ELECTROLESS DEPOSITION CONDITIONS ON THE STRUCTURES AND THE magnetic performanceS OF THE Co-Fe-P ALLOY

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Acta Metallurgica Sinica(English Letters) 2006年第4期19卷 307-312页

作者： S.L. Wang F.Q. Zeng Department of Applied Chemistry College of Materials Science and Engineering Huaqiao University Quanzhou 362021 China

Electroless Co-Fe-P alloys were deposited from an alkaline bath, containing boric acid as a buffer agent and sodium citrate as a complexing agent. As a result, with the increase of pH of the bath, the iron content of the deposit increased, whereas the cobalt and phosphorus contents decreased. The structure of the deposit was investigated using X-ray diffraction （XRD） and transmission electron microscope （TEM）. The deposit consisted of hexahedron phase Co, cubic phase Fe-Co, and amorphous phase （crystalline）. The magnetic performances of the deposit were studied using vibrating sample magnetometer （VSM）. The more the content of Fe and the less the content of P （the content of Co being less）, the better the magnetic performances of the deposit. The Co-Fe-P deposit was suitable for use as soft magnetic material.

关键词： electroless deposition Co-Fe-P structure magnetic performance

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Sodium Nitrate Passivation as a Novel Insulation Technology for Soft magnetic Composites

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Engineering 2023年第1期20卷 134-142页

作者： Mi Yan Qiming Chen Dong Liu Chen Wu Jian Wang State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China School of Chemical Engineering Shandong University of TechnologyZibo 255049China National Institute for Materials Science Tsukuba 305-0047Japan

Sodium nitrate passivation has been developed as a new insulation technology for the production of FeSiAl soft magnetic composites (SMCs). In this work, the evolution of coating layers grown at different pH values is investigated involving analyses on their composition and microstructure. An insulation coating obtained using an acidic NaNO_(3) solution is found to contain Fe2O_(3), SiO_(2), Al2O_(3), and AlO(OH). The Fe2O_(3) transforms into Fe3O4 with weakened oxidizability of the NO_(3)– at an elevated pH, whereas an alkaline NaNO_(3) solution leads to the production of Al2O_(3), AlO(OH), and SiO_(2). Such growth is explained from both thermodynamic and kinetic perspectives and is correlated to the soft magnetic properties of the FeSiAl SMCs. Under tuned passivation conditions, optimal performance with an effective permeability of 97.2 and a core loss of 296.4 mW∙cm−3 is achieved at 50 kHz and 100 mT.

关键词： Soft magnetic composites Surface passivation Insulation technology Growth mechanism magnetic performance

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