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

Abstract

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 1,800 C and 30 PSI (206.8 MPa) argon pressure for four hours produces a bulk density of 2.34 g/cc. Complex shapes can be made.

Inventors:
Publication Date:
OSTI Identifier:
6266113
Patent Number(s):
US 5240691; A
Application Number:
PPN: US 7-539392
Assignee:
Univ. of California, Oakland, CA (United States) IMS; EDB-93-121162
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Patent File Date: 18 Jun 1990
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORON; HOT PRESSING; ARGON; CONTAINERS; DENSITY; POWDERS; REFRACTORY METALS; TEMPERATURE RANGE 1000-4000 K; VERY HIGH PRESSURE; ALLOYS; ELEMENTS; FABRICATION; FLUIDS; GASES; MATERIALS WORKING; METALS; NONMETALS; PHYSICAL PROPERTIES; PRESSING; RARE GASES; SEMIMETALS; TEMPERATURE RANGE; 360601* - Other Materials- Preparation & Manufacture

Citation Formats

Hoenig, C.L.. High density crystalline boron prepared by hot isostatic pressing in refractory metal containers. United States: N. p., 1993. Web.
Hoenig, C.L.. High density crystalline boron prepared by hot isostatic pressing in refractory metal containers. United States.
Hoenig, C.L.. 1993. "High density crystalline boron prepared by hot isostatic pressing in refractory metal containers". United States. doi:.
@article{osti_6266113,
title = {High density crystalline boron prepared by hot isostatic pressing in refractory metal containers},
author = {Hoenig, C.L.},
abstractNote = {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 1,800 C and 30 PSI (206.8 MPa) argon pressure for four hours produces a bulk density of 2.34 g/cc. Complex shapes can be made.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month = 8
}
  • 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.
  • 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 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{degrees}C and 30 KSI (206.8 MPa) argon pressure for four hour produces a bulk density of 2.34 g/cc. Complex shapes can be made.
  • Boron nitride powder with less than or equal to the oxygen content of starting powder (down to 0.5% or less) is hot isostatically pressed in a refractory metal container to produce hexagonal boron nitride with a bulk density greater than 2.0 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 2.21 g/cc. Complex shapes canmore » be made.« less
  • This patent describes a method of densifying hexagonal boron nitride. It comprises placing boron nitride powder in a refractory metal container consisting essentially of tantalum, niobium, tungsten, molybdenum or alloys thereof; hot isostatically pressing the refractory container filled with boron nitride powder at about 1800 C and at about 30 KSI (206.8 MPa) to form boron nitride with a bulk density greater than 2.0 g/cc and an isotropically uniform microstructure.
  • Boron nitride powder with less than or equal to the oxygen content of starting powder (down to 0.5% or less) is hot isostatically pressed in a refractory metal container to produce hexagonal boron nitride with a bulk density greater than 2.0 g/cc. The refractory metal container is formed of tantalum, niobium, tungsten, molybdenum or alloys thereof in the form of a cansister or alternatively plasma sprayed or chemical vapor deposited onto a powder compact. Hot isostatic pressing at 1800{degrees}C and 30 KSI (206.8 MPa) argon pressure for four hours produces a bulk density of 2.21 g/cc. Complex shapes can bemore » made.« less