Zexuan Wang

Zexuan Wang
International Iberian Nanotechnology Laboratory · Micro and Nanofabrication Department

Doctor of Philosophy

About

25
Publications
2,279
Reads
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269
Citations
Additional affiliations
September 2014 - June 2017
Ningbo Institute of Materials Technology And Engineering , Chinese Academy of Sciences
Position
  • PhD Student

Publications

Publications (25)
Article
Manipulation of the internal architecture is essential for electromagnetic interference (EMI) shielding performance of metal-based coatings, which can address the electromagnetic pollution in large-size, complex geometries, and harsh environments. In this work, oriented segregated structure with conductive networks embedded in magnetic matrix was a...
Article
Hot-deformed Nd-Fe-B magnets with and without B-Fe particles are prepared to investigate the effect of B-Fe particles on the magnetic properties. After the addition of 0.5 wt% B-Fe particles, the coercivity of the hot-deformed magnet is increased. It is found that B-Fe particles inhibits the abnormal growth of grains around the melt-spun ribbons’ b...
Article
Full-text available
Pre-diffusion grain boundary strategy was proposed to fabricate die-upset Nd-Fe-B magnets with excellent magnetic properties. Microstructure modification of die-upset magnets played a key role in determining the magnetic properties. The effective coercivity enhancement of die-upset magnets through pre-diffusion process was enhanced from 0.076 T/wt%...
Article
Nano-crystalline and micron-crystalline Nd-Fe-B powders were employed to hydrogenation-disproportionation-desorption-recombination (HDDR) process to investigate the structural factors of deformation ability in HDDR powders. It was found that the deformation ability and magnetic properties of the final die-upset magnet were optimized significantly b...
Article
Stress-induced alignment of Nd2Fe14B nanograins along (001) planes represents a practical process with which to create uniaxial high-anisotropy NdFeB magnetic materials. The residual non-oriented coarse-grain defect at ribbons’ surfaces not only deteriorates the [001]-oriented structure but also facilitates the low-field nucleation of reversed magn...
Article
The effect of the morphology of the melt-spun powders on the compressive and bending strength of hot-deformed Nd-Fe-B magnets has been investigated. The results suggest that the refinement of the melt-spun powders can effectively reduce the mechanical anisotropy of the hot-deformed Nd-Fe-B magnets in two directions parallel and perpendicular to c-a...
Article
Hot deformation is one of the primary methods for fabricating anisotropic rare earth permanent magnets. Firstly, rapidly quenched powder flakes with a nanocrystal structure are condensed into fully dense isotropic precursors using the hot-pressing process. The prepared isotropic precursors are then hot-deformed to produce high-anisotropy uniaxial b...
Preprint
Hot deformation process is one of the primary methods to produce anisotropic rare earth permanent magnets. Firstly, rapidly quenched powder flakes with nanocrystal structure are condensed into the full dense isotropic precursors by hot pressing process. And then, the prepared isotropic precursors are hot deformed to produce high-anisotropy uniaxial...
Article
Hot-deformed Nd-Fe-B magnets co-doped with and without Tb-Fe addition are prepared to study the effect of Tb-Fe particles on the magnetic properties and thermal stability. With the addition of 2 wt. % Tb-Fe particles, the coercivity increases by 28.7%, while the remanence decreases by only 3.6%. It is observed that Tb atoms are diffused from the Tb...
Article
The microstructure of ribbons interface was optimized by doping the hexagonal boron nitride nanoplatelets (h-BNNP) in hot-deformed magnets. The remanence increased markedly and reached to a maximum value of 14.06 kGs. The coercivity and the energy product exhibited similar variation trends to the remanence, showing maxima of 16.92 kOe and 49 MGOe,...
Article
Low-melting eutectic diffusion has emerged as a practical approach to enhance the coercivity of hot-deformed Nd–Fe–B magnets. Herein, we report a high-efficient stress-induced eutectic diffusion method to develop high-coercivity hot-deformed Nd–Fe–B magnets. In this method, fast Pr–Cu eutectic diffusion is accomplished with the hot-pressed and hot-...
Article
Hot-deformed Nd-Fe-B magnets with a larger maximum energy product at higher operating temperature are desirable in a wide range of applications but are very challenging to realize in a common “single phase” structure. Here, we show the macroscopic structural design in hot-deformed magnets by using two kinds of melt-spun powders with/without heavy r...
Article
The anisotropic hot deformed magnets consisting of Nd-rich and Ce-rich 2:14:1 main phases were prepared using dual alloy process. After heat treatment, crystallographic alignment was improved and compositional heterogeneity reduced. Coercivity and remanence descended with increasing Ce-Fe-B addition, and then were improved after diffusing heat trea...
Article
Anisotropic Nd-Fe-B magnets with WC addition were prepared by hot deformation process. The effect of WC addition on the compressive and bending strength of hot-deformed Nd-Fe-B magnets has been investigated. The results suggest that the mechanical properties of hot-deformed magnets without WC addition show distinct anisotropy. Meanwhile, WC additio...
Article
High performance (La, Ce, Pr, Nd)-Fe-B anisotropic nanocrystalline magnets were fabricated through die-upsetting process by incorporating misch-metal in Nd-Fe-B magnets via dual alloy method. Although coercivity decrease with the increase of misch-metal monotonously, there are no significant decrease in remanence. Magnet with remanence of 13.46 kGs...
Article
Anisotropic ultrafine-grained Nd-Fe-B magnets with WC addition were prepared by hot deformation. With WC nano-particles addition of ~ 1.0 wt.%, the squareness was optimized and the coercivity of the hot-deformed magnets increased substantially by 2.16 kOe, from 15.59 to 17.75 kOe without expense of the remanent magnetization. The observation for mi...
Article
HDDR processed Nd-Fe-B powders blended with Nd-Cu powders were hot-pressed and then hot-deformed to obtain fully dense, anisotropic magnets. The microstructure evolution in hot-pressed and hot-deformed HDDR magnets was studied to illustrate the impact of Nd-Cu diffusion on coercivity and deformation ability. It was found that the coercivity and the...
Article
A Dy-Cu eutectic injection process accompanying by hot deformation had the potential to fabricate the high-performance die-upset magnets. The good fluidity of Dy-Cu eutectic liquid accelerated the formation of near-surface texture and suppressed largely the grain growth during subsequent heat treatment. By the high-temperature microstructure evolut...
Article
Full-text available
Ultrafine-grained die-upset Nd-Fe-B magnets are of importance because they provide a wide researching space to redesign the textured structures. Here is presented a route to obtain a new die-upset magnet with substantially improved magnetic properties. After experiencing the optimized heat treatment, both the coercivity and remanent magnetization o...
Article
The compressive strength, bending strength, and fracture toughness were investigated in hot-pressed and hot-deformed (HD) Nd-Fe-B magnets. The fracture behavior and its dependence on microstructure were analyzed. The results showed that magnets appear to be intergranular fracture. Additionally, the mechanical properties of HD magnets are isotropic,...
Article
Full-text available
Hot deformed magnets are prepared following hot pressing the melt spun powders. The microstructures of these magnets are analyzed through a scanning electron microscope. It can be obtained that the shape of the grains in these magnets changes to platelike, however, coarse grains are also observed. The temperature dependence of coercivity is tested...
Article
Full-text available
We report an approach to improve the electric resistivity of Nd-Fe-B die-upset magnets without sacrificing their magnetic properties very much. NdF3 fine powders were segmentally added in the die filling with MQU-F powders and then were die-upset for magnets. Experimental results indicated that electric resistivity monotonically increases with the...

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Projects

Project (1)
Project
Aim to develop the high-performance Nd-Fe-B permanent magnetic materials