High density hexagonal boron nitride prepared by hot isostatic pressing in refractory metal containers
Abstract
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 can be made.
- Inventors:
-
- Livermore, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 868307
- Patent Number(s):
- 5116589
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- density; hexagonal; boron; nitride; prepared; hot; isostatic; pressing; refractory; metal; containers; powder; equal; oxygen; content; starting; isostatically; pressed; container; produce; bulk; cc; formed; tantalum; niobium; tungsten; molybdenum; alloys; form; canister; alternatively; plasma; sprayed; chemical; vapor; deposited; compact; 1800; degree; 30; ksi; 206; mpa; argon; pressure; hours; produces; 21; complex; shapes; powder compact; hot isostatically; nitride powder; bulk density; plasma spray; oxygen content; vapor deposited; refractory metal; chemical vapor; boron nitride; hot isostatic; isostatic pressing; isostatically pressed; plasma sprayed; metal container; argon pressure; metal containers; alternatively plasma; complex shapes; hours produces; complex shape; /264/423/501/
Citation Formats
Hoenig, Clarence L. High density hexagonal boron nitride prepared by hot isostatic pressing in refractory metal containers. United States: N. p., 1992.
Web.
Hoenig, Clarence L. High density hexagonal boron nitride prepared by hot isostatic pressing in refractory metal containers. United States.
Hoenig, Clarence L. Wed .
"High density hexagonal boron nitride prepared by hot isostatic pressing in refractory metal containers". United States. https://www.osti.gov/servlets/purl/868307.
@article{osti_868307,
title = {High density hexagonal boron nitride prepared by hot isostatic pressing in refractory metal containers},
author = {Hoenig, Clarence L},
abstractNote = {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 can be made.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.