Evaporating material and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9434002-B2
Application number	US-201314042935-A
Country	US
Kind code	B2
Filing date	Oct 1, 2013
Priority date	Oct 8, 2008
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

There is provided an evaporating material of thin plate shape which can be manufactured at a reduced cost and at high productivity, the evaporating material being adapted for use in enhancing the coercive force of neodymium-iron-boron sintered magnet by heat treatment while evaporating Dy in vacuum or in reduced-pressure inert gas atmosphere. The evaporating material of this invention has a core member 1 a made of a fire-resistant metal having a multiplicity of through holes, and is made by melting a rare-earth metal or an alloy thereof so as to get adhered to, and solidified on, the core member. In this case, the above-mentioned adhesion is performed by dipping the core member into a molten bath of the rare-earth metal or an alloy thereof, and pulling it out of the molten bath.

First claim

What is claimed is:

1. A method of manufacturing an evaporating material comprising the steps of:
forming a solidified body of a rare-earth metal or of an alloy thereof by melting the rare-earth metal or the alloy thereof, by dipping a base member made of a fire-resistant metal into a molten bath of the rare-earth metal or of the alloy thereof in a state of maintaining the base member at a temperature below the melting temperature of the rare-earth metal or the alloy thereof, and thereafter by pulling up the base member to thereby form on a surface of the base member the solidified body;
detaching the solidified body off from the base member; and
working the solidified body thus detached into a plate shape.

2. The method of manufacturing the evaporating material according to claim 1 , wherein the base member is columnar shape or prismatic shape.

3. The method of manufacturing the evaporating material according to claim 1 , further comprising increasing or decreasing the time of dipping the base member into the molten bath, thereby controlling a thickness of the solidified body.

4. The method of manufacturing the evaporating material according to claim 1 , further comprising changing the temperature of the base member when dipping the base member into the molten bath, thereby controlling the thickness of the solidified body.

5. The method of manufacturing the evaporating material according to claim 1 , wherein the rare-earth metal is a member selected from the group consisting of terbium, dysprosium, and holmium.

6. The method of manufacturing the evaporating material according to claim 1 , wherein the fire-resistant metal is a member selected from the group consisting of niobium, molybdenum, tantalum, titanium, vanadium, and tungsten.

7. The method of manufacturing the evaporating material according to claim 1 , wherein the working includes cutting, rolling, or pressing.

Assignees

• Ulvac Inc

Inventors

• Nagata Hiroshi
• Shingaki Yoshinori
• Hirose Youichi
• Miyagi Kyoutoshi

Classifications

• H01F41/0293

  diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets · CPC title

• B22D23/04 Primary

  Casting by dipping (hot-dipping or immersion processes for applying coating material in the molten state without affecting the shape C23C2/00) · CPC title

• C21D1/72 Primary

  during chemical change of surfaces · CPC title

• C21D6/00

  Heat treatment of ferrous alloys · CPC title

• Y10T428/12361

  having aperture or cut · CPC title