Evaporating material and method of manufacturing the same

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 la 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.

1 . An evaporating material comprising a core member made of a fire-resistant metal and having a multiplicity of through holes, the core member having a rare-earth metal or an alloy thereof that is melted, adhered to, and solidified on, the core member. 
     
     
         2 . The evaporating material according to  claim 1 , wherein the rare-earth metal or the alloy thereof adhered to the core member is formed by dipping the core member into a molten bath of the rare-earth metal or of the alloy thereof, and by pulling up the core member therefrom. 
     
     
         3 . 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. 
     
     
         4 . The evaporating material according to  claim 1 , wherein the fire-resistant metal is a member selected from the group consisting of niobium, molybdenum, tantalum, titan, vanadium, and tungsten. 
     
     
         5 . The evaporating material according to  claim 1 , wherein the core member comprises one of a net member which is made by assembling a plurality of wire materials into lattice shape, an expanded metal, and a perforated metal. 
     
     
         6 . The evaporating material according to  claim 1 , wherein the evaporating material is heat-treated while evaporating the evaporating material inclusive of dysprosium and terbium in vacuum or in a reduced-pressure inert gas atmosphere, the evaporating material being adapted for use in enhancing a coercive force of neodymium-iron-boron sintered magnet or hot plastic working magnet. 
     
     
         7 . 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.   
     
     
         8 . The method of manufacturing the evaporating material according to  claim 7 , wherein the base member is columnar shape or prismatic shape. 
     
     
         9 . The method of manufacturing the evaporating material according to  claim 7 , further comprising increasing or decreasing the time of dipping the base member into the molten bath, thereby controlling a thickness of the solidified body. 
     
     
         10 . The method of manufacturing the evaporating material according to  claim 7 , 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. 
     
     
         11 . The method of manufacturing the evaporating material according to  claim 7 , wherein the rare-earth metal is a member selected from the group consisting of terbium, dysprosium, and holmium. 
     
     
         12 . The method of manufacturing the evaporating material according to  claim 7 , wherein the fire-resistant metal is a member selected from the group consisting of niobium, molybdenum, tantalum, titan, vanadium, and tungsten.