摘要:
Magnet material of the Sm-Fe-N system having a crystalline, hard magentic phase with a Th.sub.2 Zn.sub.17 crystal structure, wherein N atoms are incorporated into the crystal lattice, is produced. First a preliminary product is formed by sintering a Sm-Fe powder which is oriented in a magnetic field to provide a sintered body having a two-component Sm-Fe phase. The sintered body is heat treated in a nitrogen atmosphere to form the Sm-Fe-N hard magnetic phase. The nitrogen atomosphere may advantageously be reactive nitrogen.
摘要:
Magnetic material of the Sm-Fe-N system exhibits a crystalline hard magnetic phase with a Th.sub.2 Zn.sub.17 crystalline structure wherein N atoms are incorporated in the crystalline lattice. A preliminary product having a dual component Sm.sub.2 Fe.sub.17 phase is produced by mechanical alloying followed by thermal treatment to achieve the desired microstructure. The preliminary product is heated in a nitrous atmosphere, as a result of which, the hard magnetic phase is formed. The preliminary product may also be obtained by a rapid-quenching technique.
摘要翻译:Sm-Fe-N体系的磁性材料表现出具有Th2Zn17结晶结构的结晶硬磁相,其中N原子并入晶格中。 通过机械合金化制备具有双组分Sm 2 Fe 17相的初步产物,然后进行热处理以获得所需的微观结构。 在氮气气氛中加热预备产物,结果形成硬磁相。 初步产品也可以通过快速淬火技术获得。
摘要:
A shaped body of anisotropic magnetic material based on the Sm-Fe-N system which has a crystalline, hard magnetic phase with a Th.sub.2 Zn.sub.17 crystal structure, wherein N atoms are incorporated in the crystal lattice, is produced by compacting a powder Sm-Fe preliminary product with an Sm-Fe phase having a magnetically isotropic structure, followed by hot-shaping to provide an intermediate product with a Sm-Fe phase having a magnetically anisotropic structure, followed by heat treating the intermediate product in a nitrogen atmosphere to provide a Sm-Fe-N hard magnetic phase.
摘要:
An article for magnetic heat exchange includes a functionally-graded monolithic sintered working component including La1-aRa(Fe1-x-yTyMx)13HzCb with a NaZn13-type structure. M is one or more of the elements from the group consisting of Si and Al, T is one or more of the elements from the group consisting of Mn, Co, Ni, Ti, V and Cr and R is one or more of the elements from the group consisting of Ce, Nd, Y and Pr. A content of the one or more elements T and R, if present, a C content, if present, and a content of M varies in a working direction of the working component and provides a functionally-graded Curie temperature. The functionally-graded Curie temperature monotonically decreases or monotonically increases in the working direction of the working component.
摘要:
Article for use in magnetic heat exchange, intermediate article and method for producing an article for use in magnetic heat exchangeAn article for magnetic heat exchange is produced by heat treating an intermediate article comprising, in total, elements in amounts capable of providing at least one magnetocalorically active LaFe13-based phase and less than 5 Vol % impurities, wherein the intermediate article comprises a permanent magnet. The intermediate article is worked by removing at least one portion of the intermediate article. The intermediate article is then heat treated to produce a final product comprising at least one magnetocalorically active LaFe13-based phase.
摘要:
A powder consists essentially by weight, of 28.00≦R≦32.00%, where R is at least one rare earth element including Y and the sum of Dy+Tb>0.5, 0.50≦B≦2.00%, 0.50≦Co≦3.50%, 0.050≦M≦0.5%, where M is one or more of the elements Ga, Cu and Al, 0.25 wt %
摘要翻译:粉末基本上由28.00≤R≤32.00%的重量组成,其中R是包含Y的至少一种稀土元素,Dy + Tb> 0.5,0.50 <= B <= 2.00%,0.50 < Co <= 3.50%,0.050≤M≤0.5%,其中M是元素Ga,Cu和Al中的一种或多种,0.25wt%
摘要:
A process of fabricating a monolithic working component for magnetic heat exchange is disclosed. The process includes mixing two or more portions comprising amounts of La, Fe, Si and at least one of T and R suitable to produce a La1-aRa(Fe1-x-yTySix)13Hz phase, wherein T is at least one element from the group consisting of Mn, Co, Ni and Cr and R is at least one element from the group consisting of Ce, Nd, Y and Pr. The amount of T, R, and Si is selected for each of the two or more portions to provide the two or more portions with differing Curie temperatures and, preferably, a density, d, within a range of ±5% of an average density, dav, of a total number of portions. The process includes heat treating a single monolithic green body formed from two or more precursor powder mixtures to produce a single monolithic working component.
摘要:
An article (1) for magnetic heat exchange extends in a first direction (3) and in a second direction (5) generally axially perpendicular to said first direction (3). The article (1) comprises at least one magnetocalorically active phase (2). The average thermal conductivity of the article (1) is anisotropic.
摘要:
A powder consists essentially by weight, of 28.00≦R≦32.00%, where R is at least one rare earth element including Y and the sum of Dy+Tb>0.5, 0.50≦B≦2.00%, 0.50≦Co≦3.50%, 0.050≦M≦0.5%, where M is one or more of the elements Ga, Cu and Al, 0.25 wt %
摘要:
A magnetic article comprises, in total, elements in amounts capable of providing at least one (La1-aMa) (Fe1-b-cTbYc)13-dXe phase and less than 0.5 Vol % impurities, wherein 0≦a≦0.9, 0≦b≦0.2, 0.05≦c≦0.2, −1≦d≦+1, 0≦e≦3, M is one or more of the elements Ce, Pr and Nd, T is one or more of the elements Co, Ni, Mn and Cr, Y is one or more of the elements Si, Al, As, Ga, Ge, Sn and Sb and X is one or more of the elements H, B, C, N, Li and Be. The magnetic article comprises a permanent magnet.