MAGNETOSTRICTIVE MEMBER AND METHOD FOR MANUFACTURING THE SAME

• Main Author: IMAI KATSUYA
• Format: Patent
• Language: English; Japanese
• Published: 27.12.2018
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; ALLOYS; APPARATUS THEREFOR; CHEMISTRY; CRYSTAL GROWTH; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OFELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKESTHE PLACE OF A TOOL

To provide a versatile magnetostrictive member more inexpensive than the conventional single crystal manufacturing method, used for the vibration power generation of power supply in household appliances and having high performance and high reliability.SOLUTION: A magnetostrictive member is obtained by drawing molten Fe-Ga-Cu alloy from the inside of a furnace to the outside thereof at a constant speed to coagulate the alloy in one direction and form a steel ingot B consisting of a plurality of coarse crystal grains, separating the steel ingot B into single crystals D at crystal grain boundaries C, arranging a direction requiring the magnetostriction of the magnetostriction member and the direction of the Fe-Ga-Cu alloy crystal to cut the single crystal D by electrical discharge machining. The Fe-Ga-Cu alloy contains Ga:17.5-23.5 mass%, Cu:0.04-2.4 mass% and the remainder consisting of Fe and inevitable impurities.SELECTED DRAWING: Figure 2 【課題】従来の単結晶製造方法よりも安価で、家電等の電源の振動発電に用いられる高性能で高い信頼性を有する汎用性の高い磁歪部材の提供。【解決手段】溶融したＦｅ−Ｇａ−Ｃｕ合金を一定速度で炉内から炉外に引き出して一方向に凝固して、複数個の粗大な結晶粒からなる鋼塊Ｂを形成し、鋼塊Ｂを結晶粒界Ｃで個々の単結晶Ｄに分離し、単結晶Ｄから磁歪部材の磁歪を必要とする方向とＦｅ−Ｇａ−Ｃｕ合金の結晶の＜１００＞方位を揃えて放電加工によって切り出した磁歪部材。Ｆｅ−Ｇａ−Ｃｕ合金は、質量％でＧａ：１７．５〜２３．５％、Ｃｕ：０．０４〜２．４質量％を含有し、残部がＦｅ及び不可避的不純物。【選択図】図２