Abstract:
A Terbium-Dysprosium-Iron magnetostrictive material of the type Tb 1-x Dy x Fe 2-y wherein x is less than 0.7, and y is less than or equal to 0.1, and devices using these materials.
Abstract:
The invention relates to boron-low Nd-Fe-B permanent magnets that have high coercive forces. To this end, the concentrations have to meet the following requirements: 26.9 wt.- %
Abstract:
A high performance rare earth-transition metal magnetostrictive material with increased impurities having the formula (Rx1Rx2...Rx11)1(My1My2...My6)z is provided. Each R is selected from the group of elements consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, erbium and yttrium, where 0
Abstract:
An Fe-B-R permanent magnet has an excellent adhesion to an Fe-B-R permanent magnet, stable high magnet characteristics, improved abrasive and corrosion resistances, and an excellent electrical insulation. Especially, the initial magnetic characteristics hardly deteriorate even if it is left for a long time in an environment of a temperature of 80 DEG C and a relative humidity of 90 %. To produce such an Fe-B-R magnet, the surface of a magnet blank is cleaned by ion sputtering, an Al or Ti film is formed on the cleaned magnetic blank by vapor phase film-forming, such as ion plating, an aluminum oxide film is formed on the Al or Ti film by vapor phase film-forming, such as ion plating, while introducing O2 simple substance gas or an O2-containing gas. Thus, the adhesion of the deposited film is significantly improved by the aluminum oxide film, and an excellent corrosion resistance is achieved, thereby providing an Fe-B-R permanent magnet having stable magnet characteristics thanks to the corrosion and abrasive resistances and electrical insulation of the deposited corrosion-resisting metal film.
Abstract:
The invention concerns materials for permanent magnets, in particular, materials based on ternary compounds such as neodymium-iron-boron, containing one stable ternary compound such type as Fe-B-R (where R - one or some rare earth metals including yttrium) with a tetragonal structure and nonmagnetic compounds. This invention can be used for manufacturing of permanent magnets for electrical engineering, electronics, instrument-making and so on. The technical result of the present invention consists in increasing in reproducibility of magnetic properties and manufacturability of obtaining a material for permanent magnets based on the Fe-B-R ternary compound. The result is achieved by means of using the amorphous oxidic derivatives of rare earth metals as nonmagnetic compounds in the material for permanent magnets based on the Fe-B-R ternary compound containing at least one stable ternary compound of the Fe-B-R type and nonmagnetic compounds in the following component amount, weight %: at least one stable Fe-B-R type ternary compound base, amorphous oxidic derivatives of rare earth metals 2.8-3.8. In this case an amount of rare earth metals in the stable Fe-B-R type ternary compound exceeds an amount of rare earth metals in the amorphous oxidic derivatives of rare earth metals by a factor of 40-90 and the interface between the amorphous oxidic derivatives of rare earth metals (phase I) and the stable Fe-B-R type compound (phase II) is 6000-12000 cm /cm . The material based on the Fe-B-R ternary compound with addition of dysprosium and cobalt, containing amorphous compounds of the oxidic derivatives of rare earth metals, aluminium and scandium, was used for manufacturing of permanent magnets having the following magnetic properties: Br = 12.5-14 kG, Hcb = 10.5-11.5 kOe, (BH)max = 35-46 MGOe. The proposed material for permanent magnets is characterized by the high reproducibility of magnetic properties (output of sound goods 60-90 %) and by the high manufacturability (technological fitness of the powder blend 48-96 hours).
Abstract:
본 발명은 열간변형 영구자석의 제조방법에 관한 것으로, NdFeB 자성분말을 준비하는 단계; 상기 NdFeB 자성분말과, ReF 3(Re는 NdFeB에 포함된 희토류를 제외한 그외 희토류 금속) 분말을 혼합하는 단계; 상기 NdFeB 자성분말의 표면에 상기 ReF3 분말이 부착된 상태의 혼합물을 열간가압성형하는 단계; 상기 열간가압성형된 성형체를 열간변형(hot deformation) 시키는 단계; 상기 열간변형된 이방성 영구자석을 1차 후열처리하는 단계; 상기 1차 후열처리된 이방성 영구자석을 2차 후열처리하는 단계;를 포함하는 열간변형 영구자석에 관한 것이다.
Abstract:
자성 분말의 제조 방법이 제공된다. 상기 자성 분말의 제조 방법은, 희토류 원소를 포함하는 제1 소스 분말, 금속 원소를 포함하는 제2 소스 분말, 및 칼슘을 포함하는 첨가제가 혼합된 혼합 분말을 파쇄하여 베이스 분말을 준비하는 단계, 상기 베이스 분말을 하소하여, 상기 첨가제가 열분해된 일산화 칼슘(CaO)과 상기 제2 소스 분말의 반응물질을 포함하는 예비 자성 분말을 제조하는 단계, 및 상기 예비 자성 분말을 환원시켜, 상기 희토류 원소 및 상기 금속 원소의 화합물의 단일상을 갖는 자성 분말을 제조하는 단계를 포함할 수 있다.