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Method for producing magnetostrictive material

一种磁致伸缩材料、制造方法的技术，应用在用于磁致伸缩器件的材料选择、磁性材料、无机材料磁性等方向，能够解决磁致伸缩特性退化、脱模性存在问题、阻碍磁致伸缩延伸等问题

Inactive Publication Date: 2005-08-03
TDK CORPARATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the manufacturing method of the magnetostrictive material proposed in JP-A-2002-129274, when the molded body is taken out from the metal mold, the pressure (hereinafter referred to as the mold release pressure) is high, and there is a problem in its release property.
In order to reduce the demoulding pressure, it is also possible to consider adding a lubricant, but in the case of adding a lubricant, a large amount of carbon remains in the sintered body, which exists in the form of carbides, thereby hindering the extension of the magnetostriction. Tendency to degrade magnetostrictive properties

Method used

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  • Method for producing magnetostrictive material
  • Method for producing magnetostrictive material
  • Method for producing magnetostrictive material

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Embodiment 1

[0044] As raw material A, weigh Tb, Dy, Fe to make Tb 0.4 Dy 0.6 Fe 1.95 The composition of the alloy is smelted in an Ar atmosphere to make the raw material alloy. The alloy was annealed at 1170°C for 20 hours to make the concentration distribution of each metal element uniform and to eliminate the precipitated heterogeneous phase. Next, as shown in FIG. 1 , the annealed raw material alloy is pulverized (coarsely pulverized) by a Brownian mill. Coarse particles of 2 mm or larger are removed by sieving after coarse crushing, and the average particle size of the powder after removal of coarse particles is 500 μm. The average particle diameter is a value measured by a fine particle classifier (manufactured by Fishia Corporation). In addition, raw material A with various amounts of oxygen was obtained by changing the processing conditions of the powder.

[0045] Here, the amount of oxygen is a value measured by an oxygen amount measuring device (product of HORIBA: ZWGA-650A)...

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Abstract

The invention provided a method for producing a magnetostrictive material having excellent magnetostrictive properties. In the method, a starting material A expressed by formula 1: (TbxDy1-x)Ty(T is at least one metallic element selected from the group consisting of Fe, Ni and Co; and x and y satisfy the ranges of 0.35tT1-t(t satisfies the range of 0.37<=t<=1.00), and a starting material C comprising T are mixed, and the mixture is sintered to produce a magnetostriction material expressed by formula 3: (TbvDy1-v)Tw(v and w satisfy the ranges of 0.27<=v<0.50, and 1.70<=w 2.00). The content of oxygen in the starting material A is controlled to 500 to 3,000 ppm, and the content of oxygen in the starting material B is controlled to 2,000 to 7,000 ppm.

Description

technical field [0001] The present invention relates to a method for producing a magnetostrictive material whose length changes under the action of an external magnetic field, and in particular to a method for producing a material with excellent magnetostrictive properties by controlling the particle size and oxygen content of the raw material powder when the magnetostrictive material is obtained by sintering method. Background technique [0002] The phenomenon that the size of the magnet changes when magnetizing a strong magnet is called magnetostriction, and the material that produces this phenomenon is called magnetostrictive material. The saturation magnetostriction constant, which is the amount of saturation change based on magnetostriction, generally has 10 -5 ~10 -6 Magnetostrictive materials with a large saturation magnetostrictive constant are also called giant magnetostrictive materials, and are widely used in vibrators, filters, and sensors. Now know: the compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C1/04C22C33/02H01F1/055H01F1/08H10N35/85
CPCH01L41/20C22C1/0441H01F1/0557B22F1/0003B22F1/09H10N35/85
Inventor 野老诚吾森辉夫
Owner TDK CORPARATION
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