Production method for making rare earth compounds

McCallum, R William; Ellis, Timothy W; Dennis, Kevin W; Hofer, Robert J; Branagan, Daniel J

Title: Production method for making rare earth compounds

Full Record
Other Related Research

Abstract

A method of making a rare earth compound, such as a earth-transition metal permanent magnet compound, without the need for producing rare earth metal as a process step, comprises carbothermically reacting a rare earth oxide to form a rare earth carbide and heating the rare earth carbide, a compound-forming reactant (e.g. a transition metal and optional boron), and a carbide-forming element (e.g. a refractory metal) that forms a carbide that is more thermodynamically favorable than the rare earth carbide whereby the rare earth compound (e.g. Nd.sub.2 Fe.sub.14 B or LaNi.sub.5) and a carbide of the carbide-forming element are formed.

Inventors:

McCallum, R William ^[1]; Ellis, Timothy W ^[1]; Dennis, Kevin W ^[1]; Hofer, Robert J ^[1]; Branagan, Daniel J ^[1]

Ames, IA

Issue Date:: 1997-11-25

Research Org.:: Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)

OSTI Identifier:: 871245

Patent Number(s):: 5690889

Application Number:: 08/605,324

Assignee:: Iowa State University Research Foundation, Inc. (Ames, IA)

Patent Classifications (CPCs):: C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS

Show more

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C01B35/128 - {containing plural metal or metal and ammonium}

C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
C22B59/00 - Obtaining rare earth metals

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
C22C1/053 - {with in situ forming of the hard compound

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F1/057 - and IIIa elements, e.g. Nd2Fe14B

Show less

DOE Contract Number:: W-7405-ENG-82

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: production; method; rare; earth; compounds; compound; earth-transition; metal; permanent; magnet; producing; process; step; comprises; carbothermically; reacting; oxide; form; carbide; heating; compound-forming; reactant; transition; optional; boron; carbide-forming; element; refractory; forms; thermodynamically; favorable; whereby; 14; lani; formed; earth oxide; refractory metal; permanent magnet; transition metal; rare earth; earth metal; earth-transition metal; earth compound; process step; metal permanent; forming element; production method; earth compounds; /420/148/423/

Citation Formats


                    McCallum, R William, Ellis, Timothy W, Dennis, Kevin W, Hofer, Robert J, and Branagan, Daniel J. Production method for making rare earth compounds.  United States: N. p., 1997. 
        Web.

Copy to clipboard


                    McCallum, R William, Ellis, Timothy W, Dennis, Kevin W, Hofer, Robert J, & Branagan, Daniel J. Production method for making rare earth compounds.  United States.

Copy to clipboard


                    McCallum, R William, Ellis, Timothy W, Dennis, Kevin W, Hofer, Robert J, and Branagan, Daniel J. Tue .  
        "Production method for making rare earth compounds".  United States.  https://www.osti.gov/servlets/purl/871245.

Copy to clipboard


                    
@article{osti_871245,

  title        = {Production method for making rare earth compounds},

  author       = {McCallum, R William and Ellis, Timothy W and Dennis, Kevin W and Hofer, Robert J and Branagan, Daniel J},

  abstractNote = {A method of making a rare earth compound, such as a earth-transition metal permanent magnet compound, without the need for producing rare earth metal as a process step, comprises carbothermically reacting a rare earth oxide to form a rare earth carbide and heating the rare earth carbide, a compound-forming reactant (e.g. a transition metal and optional boron), and a carbide-forming element (e.g. a refractory metal) that forms a carbide that is more thermodynamically favorable than the rare earth carbide whereby the rare earth compound (e.g. Nd.sub.2 Fe.sub.14 B or LaNi.sub.5) and a carbide of the carbide-forming element are formed.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1997},

  month        = {11}

}

Copy to clipboard

Patent:

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE Patents and OSTI.GOV collections:

Metal sulfide and rare-earth phosphate nanostructures and methods of making same

Patent Wong, Stanislaus; Zhang, Fen

The present invention provides a method of producing a crystalline rare earth phosphate nanostructure. The method comprising: providing a rare earth metal precursor solution and providing a phosphate precursor solution; placing a porous membrane between the metal precursor solution and the phosphate precursor solution, wherein metal cations of the metal precursor solution and phosphate ions of the phosphate precursor solution react, thereby producing a crystalline rare earth metal phosphate nanostructure.
Full Text Available
Rare earth-activated aluminum nitride powders and method of making

Patent Han, Bing; Tao, Jonathan H.; Raukas, Madis; ...

Rare earth-activated aluminum nitride powders are made using a solution-based approach to form a mixed hydroxide of aluminum and a rare earth metal, the mixed hydroxide is then converted into an ammonium metal fluoride, preferably a rare earth-substituted ammonium aluminum hexafluoride ((NH4)3Al1-xRExF6), and finally the rare earth-activated aluminum nitride is formed by ammonolysis of the ammonium metal fluoride at a high temperature. The use of a fluoride precursor in this process avoids sources of oxygen during the final ammonolysis step which is a major source of defects in the powder synthesis of nitrides. Also, because the aluminum nitride is formedmore » « less
Full Text Available
Surface-hardened aluminum-rare earth alloys and methods of making the same

Patent Rios, Orlando; Babu, Sudarsanam Suresh; Dehoff, Ryan R.; ...

Embodiments of surface-hardened aluminum-rare earth alloys and methods of making the alloys are disclosed. In some embodiments, the alloy comprises aluminum and 4 wt % to 60 wt % of a rare earth component X having a maximum solid solubility of ≤0.5 wt % in aluminum. The surface-hardened alloy component has an alloy bulk portion and a hardened alloy surface portion. At least a portion of the hardened alloy surface portion has a Vickers hardness that is at least 30% greater than a Vickers hardness of the alloy bulk portion.
Full Text Available
Laminated rare earth structure and method of making

Patent Senor, David J [West Richland, WA]; Johnson, Roger N [Richland, WA]; Reid, Bruce D [Pasco, WA]; ...

A laminated structure having two or more layers, wherein at least one layer is a metal substrate and at least one other layer is a coating comprising at least one rare earth element. For structures having more than two layers, the coating and metal substrate layers alternate. In one embodiment of the invention, the structure is a two-layer laminate having a rare earth coating electrospark deposited onto a metal substrate. In another embodiment of the invention, the structure is a three-layer laminate having the rare earth coating electrospark deposited onto a first metal substrate and the coating subsequently abonded tomore » « less
Full Text Available
Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making

Patent McCallum, R William [Ames, IA]; Branagan, Daniel J [Ames, IA]

A method of making a permanent magnet wherein 1) a melt is formed having a base alloy composition comprising RE, Fe and/or Co, and B (where RE is one or more rare earth elements) and 2) TR (where TR is a transition metal selected from at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Al) and at least one of C and N are provided in the base alloy composition melt in substantially stoichiometric amounts to form a thermodynamically stable compound (e.g. TR carbide, nitride or carbonitride). The melt is rapidly solidified in a mannermore » « less
Full Text Available

Similar Records