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Method for producing a giant magnetostrictive alloy

外国特許コード F110005756
整理番号 Y0414US2
掲載日 2011年9月14日
出願国 アメリカ合衆国
出願番号 55176009
公報番号 20100006183
公報番号 8092616
出願日 平成21年9月1日(2009.9.1)
公報発行日 平成22年1月14日(2010.1.14)
公報発行日 平成24年1月10日(2012.1.10)
国際出願番号 JP2004014963
国際公開番号 WO2005087963
国際出願日 平成16年10月8日(2004.10.8)
国際公開日 平成17年9月22日(2005.9.22)
優先権データ
  • 特願2004-069787 (2004.3.11) JP
  • 2004WO-JP14963 (2004.10.8) WO
  • 2006US-11598767 (2006.9.11) US
発明の名称 (英語) Method for producing a giant magnetostrictive alloy
発明の概要(英語) (US8092616)
A rapidly solidified Fe―Ga alloy containing 15 to 23 atomic percent of Ga having a particular rapidly solidified texture is formed into slices which are laminated to each other in a die, or is formed into a powder or chops which are filled in the die.
Subsequently, spark plasma sintering is performed so that bonds between the slices, grains of the powder, or the chops are formed at a high density to form a bulk alloy and the rapidly solidified texture is not lost, followed by annealing whenever necessary, so that a magnetostriction of 170 to 230 ppm at room temperature is obtained.
特許請求の範囲(英語) [claim1]
1. A method for producing a giant magnetostrictive alloy for actuators and sensors, comprising the steps of: forming a rapidly solidified material by a liquid rapid solidification method, wherein the material is a polycrystalline Fe -- Ga alloy having a high temperature-side disordered bcc structure and a fine columnar texture, being in a disordered to an ordered transition composition range, and containing 15 to 23 atomic percent of Ga;
forming slices, or a powder from the alloy as a raw material; and
performing spark plasma sintering of the raw material at an application pressure of 50 MPa or more and at a sintering temperature of 873K or more under conditions in which the pressure and the temperature are controlled so that the texture of the rapidly solidified material is not lost.
[claim2]
2. The method for producing a giant magnetostrictive alloy for actuators and sensors, according to claim 1, wherein annealing is performed after the sintering to obtain a magnetostriction of 170 to 230 ppm at room temperature.
[claim3]
3. The method for producing a giant magnetostrictive alloy for actuators and sensors, according to claim 2, wherein the crystal orientation of alloy properties is enhanced by annealing in a magnetic field after the sintering, and the magnetic moment (magnetic domain structure) directly relating to the magnetostriction is controlled.
  • 発明者/出願人(英語)
  • FURUYA YASUBUMI
  • OKAZAKI TEIKO
  • SAITO CHIHIRO
  • YOKOYAMA MASAKI
  • OOMORI MAMORU
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • B22F009/00M6
  • C22C001/04F1
  • C22C014/00
  • C22C033/02F4
  • C22F001/00M
  • C22F001/18B
  • L22F003/24T
  • L22F009/04A
  • L22F009/04F
  • L22F998/00
  • L22F998/10
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