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

Patent · Tue May 26 00:00:00 EDT 1992

OSTI ID:7306496

Hoenig, C L

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.

• Assignee: Dept. of Energy, Washington, DC (United States)
• Patent Number(s): A; US 5116589
• Application Number: PPN: US 7-539393
• OSTI ID: 7306496
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
BORON COMPOUNDS
BORON NITRIDES
DENSITY
FABRICATION
HOT PRESSING
MATERIALS WORKING
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
POWDERS
PRESSING
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K