Liang Qiao

Zhejiang University of Technology

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Yao Ying

Harbin University of Commerce

Shenglei Che

Zhejiang University of Technology

Wangchang Li

Zhejiang University of Technology

Juan Li

Zhejiang University of Technology

Jingwu Zheng

Zhejiang University of Technology

Jing Yu

Zhejiang University of Technology

Wei Cai

Zhejiang University of Technology

Haibo Chen

Zhejiang University of Technology

Jing Yu

Chinese PLA General Hospital

Chunming Xu

China University of Petroleum, Beijing

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Zhejiang University of Technology

China University of Petroleum, Beijing

Materials Science & Engineering

Harbin Institute of Technology

Beijing Institute of Technology

Soochow University

Shanghai University

Nanjing University of Science and Technology

State Key Laboratory of Heavy Oil

Jiangsu University

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Novel titanium silicon micro-mesoporous composites via nano-assembly strategy for efficient hydrodesulfurization of dibenzothiophene

Chemical Engineering Journal (2024)

Dongze Li Chengkun Xiao Yutong Zou Liang Qiao Chunhui Zhou

Dibenzothiophene

10.1016/j.cej.2024.152938

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Citations (4)

Substitution of Sn in the high-permeability MnZn ferrite for wide temperature applications

Ceramics International (2024)

Yao Ying Huanhuan Zheng Zhaocheng Li Jingwu Zheng Jing Yu

Substitution (logic)

10.1016/j.ceramint.2024.05.287

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Citations (1)

Synthesis of High Coercivity Doped Srfe12o19 by Ultrasonic Spray Pyrolysis

Siyuan Wang Jingwu Zheng Wei Cai Liang Qiao Yao Ying

This study used element substitution doping and particle morphology control to create high coercivity SrFe12O19 by ultrasonic spray pyrolysis. By changing the ratio of Fe3+/Sr2+ in the precursor solution, we were able to produce the single phase of SrFe12O19. The coercivity of the powder can be greatly increased by adding Sm3+ into the precursor solution and then making Sm3+ replace Sr2+ in the proper proportion. With KCl assist, the product was refined to obtain porous SrFe12O19 powder with high coercivity. By prolonging the sintering time, plate-like SrFe12O19 was obtained. And the grain size did not grow significantly under the barrier of KCl. The specific saturation magnetization was improved while maintaining high coercivity. By doping of Sm, ultrasonic spray KCl assists, and extending sintering time, ferrite powders with high performance were prepared, which possessed the coercivity (Hcj) of 6.44 KOe and the specific saturation magnetization (σs) of 62.28 emu/g.

10.2139/ssrn.4385440

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Influence of grain size of acidic NiMo/TS-1 on its catalytic performance for hydrodesulfurization of dibenzothiophenes

Carbon Resources Conversion (2024)

Yutong Zou Chengkun Xiao Xiaoyang Kong Liang Qiao Wei Wang

10.1016/j.crcon.2024.100299

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Low Power Loss Manganese Ferrites with the Addition of Ta2o5 for Mhz Applications

SSRN Electronic Journal (2022)

Yao Ying Xiao Le Hu Zhaocheng Li Jingwu Zheng Jing Yu

Dramatic increase of power loss in the MHz frequency range is the bottleneck problem for MnZn ferrites to apply in high-frequency power electronic devices. In this work, manganese ferrites with low power loss in the frequency range of 1-3 MHz have been developed by the addition of Ta 2 O 5 . The manganese ferrite with 300 ppm Ta 2 O 5 exhibits the best P cv performance. P cv is as low as 41, 94 and 164 kW/m 3 under measurement conditions of 1 MHz/50 mT, 2 MHz/50 mT and 3 MHz/30 mT at 25 °C, respectively. Excellent temperature stability of power loss is also achieved in this sample in the temperature range of 25-140 °C.Power loss was divided to three parts of hysteresis loss, eddy current loss and residual loss. Small content of Ta 2 O 5 segregates at grain boundaries and reduces all three parts of loss. The mechanism of Ta 2 O 5 influence on each part of loss has been clarified.

Power loss

10.2139/ssrn.4044420

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Monomolecular Crosslinked Highly Dense Cubic Feco Nanocomposite for High Frequency Application

SSRN Electronic Journal (2022)

Shenglei Che Wangchang Li Guangzhou Su Wanjia Li Yao Ying

Well-dispersed silica-coated FeCo nanocubes are mass prepared using the polyol process and are then amine-functionalized with 1,6- diaminohexane. Further, the almost “matrix-free” soft magnetic nanocomposites (SMNCs) are fabricated using the FeCo nanocubes as bricks, which are cross-linked by epoxy monomers in which the nanoparticles are well separated. These SMNCs exhibit a dense microstructure and extremely high resistivity that limit the eddy current loss, thereby allowing excellent high frequency inductance performance in a few hundred of megahertz and extending the cut-off frequency to 2–7 GHz. The permeability is approximately 8.0 with excellent high frequency stability at 1 GHz. The quality factor of the nanocomposites exceeds 200 in the 100 MHz range and 500 in the few megahertz range that correspond to the 36 and 13 nm silica-coating samples, respectively. Furthermore, they exhibit a novel microwave absorbing property with an extremely thin thickness. The absorption approaches -46.5 dB at 2.41 GHz with only a 1.75 mm nanocomposite absorbing layer. This SMNC presents a great potential as multifunction components to satisfy the urgent requirement of wide bandgap semiconductor power in the megahertz range and microwave devices in the gigahertz range.

10.2139/ssrn.4048782

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High Frequency Application of Ultrafine Submicron Febp Amorphous Soft Magnetic Composites

SSRN Electronic Journal (2022)

Wangchang Li Xiao-Feng Han Qiang Li Junke Wu Wanjia Li

A novel amorphous soft magnetic composites (ASMCs) for hundreds MHz frequency applications have been prepared under the hot-pressing molding by ultrafine submicron FeBP amorphous powders. These ultrafine submicron FeBP amorphous particles were synthesized with the NaBH4 chemical reduction method and the particles size was regulated by the drop rate of the reducing agent. The morphology, microstructure, elemental composition and high-frequency magnetic properties of the amorphous soft magnetic composites was systematically investigated. The particle sizes of FeBP amorphous powders are distributed in 600 nm to 900 nm which gradually increase with the decrease of the drop rate of the NaBH4 aqueous solution. Meanwhile, the Fe element content and saturation magnetization strength of the amorphous powder increase and the coercivity gradually decreases. The corresponded ASMCs also appear a commensurate permeability in the range of 6~9 responding to the GHz high frequency range with the lowest loss tangent only 0.20 and 0.44 at 500 MHZ and 1 GHz, respectively. Such ultrafine amorphous soft magnetic composites have enormous potential for high frequency applications in wide band gap semiconductor switching power supplies, RF inductors and chips.

10.2139/ssrn.4218690

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Citations (3)

High coercivity in Sm-doped SrFe12O19 powders with spherical morphology prepared by ultrasonic spray pyrolysis

Ceramics International (2023)

Siyuan Wang Jingwu Zheng Wei Cai Liang Qiao Yao Ying

10.1016/j.ceramint.2023.12.269

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Citations (5)

Magnetic Properties and Microstructure of Ce-Cu-Al Low Melting Alloy Bonding Sm2fe17n3 Magnet Fabricated by the Hot-Pressing Method

SSRN Electronic Journal (2022)

Jingwu Zheng Shitong Yu Heng Huang Rongyao Li Wei Cai

Ce72Cu28-xAlx (x=0, 3, 6, 9, 12) alloy binders were prepared with lower melting point than Zn metal, and then high-performance Ce-based alloy bonding Sm2Fe17N3 magnets were realized by hot-pressing method. Experimental results showed that compared with Zn metal, Ce72Cu28-xAlx alloys exhibited lower density and better bonding effect. Under the same conditions, it had larger volume fraction which was more conducive to the densification of magnets. In addition, different from Zn powder with high oxygen content causing lower magnetic performance, Ce-based alloy bonded magnet had better performance despite a very high oxygen content. The remanence of the alloy bonded magnet was 10.19kGs by using 5wt. % Ce72Cu22Al6 alloy as binder, and the maximum magnetic energy product reached up to 21.06MGOe. Therefore, the Ce72Cu28-xAlx alloy was a promising rare earth-based alloy binder. By further reducing the oxygen content of the alloy powder, Sm2Fe17N3 bonded magnet with higher performance could be prepared.

Hot pressing

10.2139/ssrn.4214391

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Citations (1)

Properties of bulk magnets prepared by hot pressing using Zn- coated Sm-Fe-N magnetic powder by electrodeposition

Surfaces and Interfaces (2024)

Dongsheng Shi Jingwu Zheng Wei Cai Heng Huang Haibo Chen

Hot pressing

10.1016/j.surfin.2024.103916

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Citations (2)