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

Patent Application ·
OSTI ID:10163519

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 be made.

Research Organization:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
W-7405-ENG-48
Assignee:
Dept. of Energy
Patent Number(s):
PATENTS-US-A7539393
Application Number:
ON: DE92017197; PAN: 7-539,393
OSTI ID:
10163519
Resource Relation:
Other Information: PBD: 1990
Country of Publication:
United States
Language:
English