The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 26, 1991
Filed:
Jun. 18, 1990
Katsuhiko Murakami, Tokyo, JP;
Nobuo Yamagami, Tokyo, JP;
Toshiyuki Nakanishi, Yokosuka, JP;
Iwao Nakano, Yokosuka, JP;
Keiichi Kobayashi, Tokyo, JP;
Takashi Yokhikawa, Tokyo, JP;
NKK Corporation, Tokyo, JP;
Japan Marine Science and Technology Center, Yokosuka, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A method for manufacturing an alloy rod having giant magnetostriction, which comprises the steps of: supplying a granular or flaky alloy material, which comprises at least two rare earth metals including terbium and dysprosium and at least one transition metal, into a tubular crucible in an inert gas atmosphere kept under a pressure of from 0.2 to 10 atm., arranged in a vertical cylindrical heating furnace; totally melting the alloy material in the crucible in the heating furnace; and then vertically moving any one of the crucible and the heating furnace at a speed of from 0.1 to 5.0 mm/minute in a temperature region of from 1,270.degree. to 1,180.degree. C. of the heating furnace, in which a temperature decreases at a temperature gradient of from 10.degree. to 100.degree. C./cm, to solidify and crystallize the resultant melt of the alloy material in the crucible in a lower portion of the heating furnace, thereby manufacturing an alloy rod having giant magnetostriction, which comprises a single-crystal structure of a unidirectional-solidification structure consistent with the axial line thereof.