Densified molybdenum metal powder

• US 8,043,405 B2
• Filed: 12/18/2008
• Issued: 10/25/2011
• Est. Priority Date: 10/21/2004
• Status: Expired due to Fees

• Current Assignee: Cyprus AMAX Minerals Company (Freeport-Mcmoran Copper & Gold Incorporated)
• Original Assignee: Climax Engineered Materials, LLC (Freeport-Mcmoran Copper & Gold Incorporated)
• Inventors: Thompson, Patrick Ansel, Johnson, Loyal M. Jr., Jha, Sunil Chandra
• Primary Examiner(s): WYSZOMIERSKI, GEORGE P
• Application Number:
  US12/338,827
• Publication Number:
  US 20090116995A1
• Time in Patent Office: 1,041 Days
• Field of Search: None
• US Class Current: 75/255
• CPC Class Codes: B22F 1/05 Metallic powder characterised by the size or surface area of the particles
• CPC Class Codes: B22F 1/052 characterised by a mixture of particles of different sizes or by the particle size distribution
• CPC Class Codes: B22F 9/22 using gaseous reductors

Abstract

Densified molybdenum metal powder. Densified molybdenum metal 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/50 g as determined by a Hall Flowmeter.

Claims

1. A densified molybdenum metal powder comprising:

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, a total weight percent of oxygen less than about 0.05%, and a flowability value less than about 32 s/50 g as determined by a Hall Flowmeter, said particles comprising a densified form of a molybdenum metal powder precursor material 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.

2. The densified molybdenum metal powder of claim 1 further comprising a tap density of at least about 3 g/cm³.

3. The densified molybdenum metal powder of claim 1 further comprising a Scott density of at least about 2 g/cm³.

4. The densified molybdenum metal powder of claim 3 wherein said molybdenum metal powder precursor material further comprises particles having an average size of about 60 μ

m.

5. The densified molybdenum metal powder of claim 1 wherein at least about 45% of said particles of molybdenum metal have a particle size larger than a size +140 standard Tyler mesh sieve.

6. The densified molybdenum metal powder of claim 1 wherein said particles of molybdenum metal further comprise substantially generally spherical particles.

7. The densified molybdenum powder of claim 1 wherein said flowability value less than about 32 s/50 g further comprises flowability in a range from about 16 s/50 g to about 32 s/50 g.