Then, the magnetocrystalline anisotropy of Nd-Fe-B sintered magnets increases. ... Neodymium-iron-boron (Nd-Fe-B) sintered magnets have excellent magnetic properties such as the remanence ... Hence, a study on the control of the microstructure of Nd-Fe-B magnets is being conducted.
Subsequently, Dy diffuses into the grain boundaries of Nd-Fe-B magnets, forming Dy-Fe-B or Nd-Dy-Fe-B ... and Tb, has been widely used to enhance the coercivity of Nd-Fe-B permanent magnets. ... For example, a Dy compound is coated onto the surface of Nd-Fe-B sintered magnets, and then the magnets
Nd-Fe-B magnets. ... The formation of a highly anisotropic (Nd, Dy)2Fe14B phase layer, which acts as the shell in the core-shell-type ... because of the comparatively easy diffusion path provided by Cu and Al owing to their solubility in the Nd-rich
to fabricate a dense Nd-Fe-B magnet. ... Because magnets fabricated using Nd-Fe-B exhibit excellent magnetic properties, this novel material ... However, because of the brittleness and low formability of Nd-Fe-B magnets, the design freedom of shapes
High-coercive (Nd,Dy)-Fe-B magnets were fabricated via dysprosium coating on Nd-Fe-B powder. ... The increase in coercivity of the Nd-Fe-B sintered magnet is discussed from a micro- structural point ... (Nd,Dy)2Fe14B phases may have effectively penetrated into the boundaries between neighboring Nd2Fe14B
Nd5Pr7Fe82B6 및 Nd12Fe82B6 조성의 1차 용유된 ingot에 대하여 기계적 분쇄처리 및 열처리를 행하고 결정구조 및 자기적 특성을 측정하였다. ... 600˚C에서 2시간 열처리함으로써 항자계가 18.36-18.79kOe, 최대에너지적이 8.32-8.38 MGOe인 자기적 특성을 얻었다. ... Ar 분위기 하에서 330시간 분쇄처리한 결과 2~3μm크기의 입자가 얻어졌으며, x-선 회절도로부터 각 입자는 미세한 결정립으로 구성되어 있음을 알았다. 330시간 분쇄처리된 분말을
Nd-(Fe, Co)-B합금에 Ni, Al, Ti등을 복합치환하여 그에 따른 산화거동과 자기적 성질의 변화를 조사하였다. ... 표면의 산화층은 Nd산화물이었고, 이는 입계에 있는 Nd-rich상이 산화되고 이것이 확산 통로로 작용하였다고 생각된다. ... 또한 산화된 리본은 Nd-rich상의 우선적 산화에 의해 표면에 요철이 관찰되었으며 Ni 첨가시 그러한 요철은 많이 줄어들었다.
In this study, the sintering behavior of (Nd, Dy)-Fe-B powder which fabricated by strip-casting was ... The phase transformation of Nd-rich was confirmed by X-ray diffraction pattern.
A novel route to prepare Nd-Fe-B magnetic particles by utilizing both spray drying and reduction/diffu ... Finally, Nd2Fe14B magnetic particles were synthesized after washing in de-ionized water with a mean size ... Moreover, diffusion between Nd andFe occurred during Ca reduction andNd2Fe14B particles were formed
Sintered Nd-Fe-B magnets are widely used in many fields such as motors, generators, actuators, microwaves ... Nd-Fe-B based sintered magnets were prepared by isothermal sintering and cyclic sintering processes. ... Many researchers have shown that the Nd-rich phase was essentially important for high magnet properties
, small amount of Dy compounds such as and was mixed with (Nd, Dy)-Fe-B powder. ... In order to increase the coercivity of (Nd, Dy)-Fe-B sintered magnets without much reduction of remanence ... After mixing, the coercivity of (Nd, Dy)-Fe-B sintered magnets apparently increased with the increase
B화합물을 생성하는 Cr, Mn, Nb 그리고 w과 같은 첨가원소가 Nd-Fe-B계 소결자석의 착자특성에 미치는 영향에 대해서도 조사하였다. ... Cr이나 W첨가는 보자력의 향상에 효과적이고 Nd16Fe72Cr4B9합금은 Nd16Fe72V4B8합금과 비슷한 착자특성을 보였다. 한국재료학회 한국재료학회지 홍연기, 김종오 ... 합금의 주조시 냉각속도가 Nd16Fe72V4B8 소결자석의 결정립 분포와 착자특성에 미치는 영향에 대하여 조사하였다.
The resultant Nd-Fe-B powder was spherical with the size of 1 . ... The magnetic Nd-Fe-B powders were prepared by a thermochemical method, consisting of the processes of ... spray-drying, debinding, milling, H-reduction, Ca-reduction, and washing.
of Nd-Fe-B sintered magnets. ... Sintered Nd-Fe-B magnets have been widely used due to their excellent magnetic properties, especially ... The microstructure of Nd-Fe-B magnets strongly affects their magnetic properties, in particular the coercivity