High density crystalline boron prepared by hot isostatic pressing in refractory metal containers

Patent · Fri Jan 01 04:00:00 EST 1993

OSTI ID:868904

Hoenig, Clarence L ^[1]

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1. Livermore, CA

Boron powder is hot isostatically pressed in a refractory metal container to produce a solid boron monolith with a bulk density at least 2.22 g/cc and up to or greater than 2.34 g/cc. The refractory metal container is formed of tantalum, niobium, tungsten, molybdenum or alloys thereof in the form of a canister or alternatively plasma sprayed or chemical vapor deposited onto a powder compact. Hot isostatic pressing at 1800.degree. C. and 30 KSI (206.8 MPa) argon pressure for four hours produces a bulk density of 2.34 g/cc. Complex shapes can be made.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• DOE Contract Number: W-7405-ENG-48
• Assignee: Regents of University of California (Oakland, CA)
• Patent Number(s): US 5240691
• OSTI ID: 868904
• Country of Publication: United States
• Language: English

Related Subjects

/423/264/419/
1800
206
22
30
34
alloys
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alternatively plasma
argon
argon pressure
boron
boron powder
bulk
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canister
cc
chemical
chemical vapor
compact
complex
complex shape
complex shapes
container
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crystalline
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degree
density
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deposited
form
formed
hot
hot isostatic
hot isostatically
hours
hours produces
isostatic
isostatic pressing
isostatically
isostatically pressed
ksi
metal
metal container
metal containers
molybdenum
monolith
mpa
niobium
plasma
plasma spray
plasma sprayed
powder
powder compact
prepared
pressed
pressing
pressure
produce
produces
refractory
refractory metal
shapes
solid
solid boron
sprayed
tantalum
tungsten
vapor
vapor deposited