摘要:
An article for magnetic heat exchange comprising a magnetocalorically active phase with a NaZn13-type crystal structure is provided by hydrogenating a bulk precursor article. The bulk precursor article is heated from a temperature of less than 50° C. to at least 300° C. in an inert atmosphere and hydrogen gas only introduced when a temperature of at least 300° C. is reached. The bulk precursor article is maintained in a hydrogen containing atmosphere at a temperature in the range 300° C. to 700° C. for a selected duration of time, and then cooled to a temperature of less than 50° C.
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 reactive sintered magnetic article, a composite article comprising a mantle and at least one core and a laminate article comprising two or more composite articles are provided which each comprise (La1-aMa) (Fe1-b-cTbYc)13-dXe, wherein 0≦a≦0.9, 0≦b≦0.2, 0.05≦c≦0.2, −1≦d≦+1, 0≦e≦3.
摘要:
The invention relates to hard magnetic films made of a polymer matrix and hard magnetic powder particles distributed therein. The films have a thickness of preferably 100 to 500 &mgr;m and are flexible. They can be produced by using a casting method and are suited, for example, as hard magnetic components in miniature motors, polarized relays or sensors.
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:
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:
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.