Densified molybdenum metal powder and method for producing same
First Claim
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1. A method for producing densified molybdenum metal powder comprising:
- providing a supply of a precursor material comprising molybdenum metal particles reduced from ammonium molybdate;
providing a supply of reducing gas;
densifying said precursor material in the presence of said reducing gas; and
producing said densified molybdenum metal powder comprising substantially generally spherical particles of molybdenum metal, having a surface-area-to-mass ratio of no more than about 0.5 m2/g as determined by BET analysis and a flowability greater than about 32 s/50 g as determined by a Hall Flowmeter.
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Abstract
Densified molybdenum metal powder and method for producing same. Densified molybdenum powder has substantially generally spherical particles, surface area to mass ratio of no more than about 0.5 m2/g as determined by BET analysis, and a flowability greater than about 32 s/50g as determined by a Hall Flowmeter. A method for producing densified molybdenum metal powder includes providing a supply of precursor material of molybdenum metal powder particles reduced from ammonium molybdate; providing a supply of reducing gas; densifying the precursor material in the presence of the reducing gas; and producing the densified molybdenum metal powder.
52 Citations
35 Claims
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1. A method for producing densified molybdenum metal powder comprising:
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providing a supply of a precursor material comprising molybdenum metal particles reduced from ammonium molybdate; providing a supply of reducing gas; densifying said precursor material in the presence of said reducing gas; and producing said densified molybdenum metal powder comprising substantially generally spherical particles of molybdenum metal, having a surface-area-to-mass ratio of no more than about 0.5 m2/g as determined by BET analysis and a flowability greater than about 32 s/50 g as determined by a Hall Flowmeter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for producing a densified molybdenum metal powder comprising:
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providing a supply of a precursor material comprising molybdenum metal particles having a surface-area-to-mass ratio of between about 1 m2/g and about 4 m2/g as determined by BET analysis, and a flowability of between about 29 s/50 g and about 86 s/50 g as determined by a Hall Flowmeter; providing a supply of reducing gas; densifying said precursor material in the presence of said reducing gas; and creating said densified molybdenum metal powder. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for producing a densified molybdenum metal powder comprising:
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introducing into a furnace a supply of precursor material comprising molybdenum metal particles reduced from ammonium molybdate and having a surface-area-to-mass ratio of between about 1 m2/g and about 4 m2/g as determined by BET analysis, and a flowability of between about 29 s/50 g and about 86 s/50 g as determined by a Hall Flowmeter; introducing a reducing gas into said furnace; densifying said precursor material in the presence of said reducing gas at a substantially uniform temperature; and producing said densified molybdenum metal powder having a surface-area-to-mass ratio of no more than about 0.5 m2/g as determined by BET analysis and a flowability greater than about 32 s/50 g as determined by a Hall Flowmeter. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A method for producing densified molybdenum metal powder, comprising:
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introducing into a plasma furnace a supply of precursor material comprising molybdenum metal particles reduced from ammonium molybdate and having a surface-area-to-mass ratio of between about 1 m2/g and about 4 m2/g, as determined by BET analysis, and a flowability of between about 29 s/50 g and 86 s/50 g as determined by a Hall Flowmeter; creating a plasma; densifying said precursor material in said plasma; and producing said densified molybdenum metal powder comprising spherical particles of molybdenum metal. - View Dependent Claims (27, 28, 29, 30, 31)
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32. A method for producing densified molybdenum powder, comprising:
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introducing a supply of ammonium molybdate precursor material into a first furnace; introducing a first reducing gas into said first furnace; heating said ammonium molybdate precursor material in the presence of said first reducing gas in said first furnace; producing a molybdenum metal powder intermediate having a surface-area-to-mass ratio of between about 1 m2/g and about 4 m2/g, as determined by BET analysis, and a flowability of between about 29 s/50 g and about 86 s/50 g as determined by a Hall Flowmeter; introducing said molybdenum metal powder intermediate into a second furnace; introducing a second reducing gas into said second furnace; densifying said intermediate molybdenum metal powder in the presence of said second reducing gas in said second furnace; and producing said densified molybdenum metal powder having a surface-area-to-mass ratio of no more than about 0.5 m2/g as determined by BET analysis and a flowability greater than about 32 s/50 g as determined by a Hall Flow meter.
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33. A method for producing densified molybdenum powder, comprising:
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introducing a supply of ammonium molybdate precursor material into a first furnace; introducing a reducing gas into said first furnace; heating said ammonium molybdate precursor material in the presence of said first reducing gas in said first furnace; producing a molybdenum metal powder intermediate having a surface-area-to-mass ratio of between about 1 m2/g and about 4 m2/g, as determined by BET analysis, and a flowability of between about 29 s/50 g and about 86 s/50 g as determined by a Hall Flowmeter; introducing said intermediate molybdenum metal powder into a plasma induction furnace; creating a plasma; densifying said molybdenum metal powder intermediate in said plasma; and producing said densified molybdenum metal powder comprising spherical particles of molybdenum metal. - View Dependent Claims (34, 35)
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Specification