Hot isostatic pressing of ceramics

Technical Report · Tue Oct 01 00:00:00 EDT 1985

OSTI ID:5906643

Honma, K

A mixture containing glass 70 to 95 vol.% and BN or B/sub 4/C powder (0.1-10 microns) 5 to 30 vol. % is used as a secondary pressure medium in hot isostatic pressing of ceramics. Thus, Pyrex beads were mixed with 15vol.% BN powder (average diameter 2 microns), fused at 1400 deg for 2 h, cooled, crushed, and put into a graphite crucible. A Si/sub 3/N/sub 4/ sintered body was embedded in the powder, heated in vacuum at 1200 deg for 2 h, treated in a hot isostatic press furnace at 1700 deg and 1000 atm. for 1 h, and cooled to give a Si/sub 3/N/sub 4/ ceramic. It was easily separated from the crucible.

• Research Organization: National Aeronautics and Space Administration, Washington, DC (USA)
• OSTI ID: 5906643
• Report Number(s): N-86-15397
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
BORON CARBIDES
BORON COMPOUNDS
BORON NITRIDES
BOROSILICATE GLASS
CARBIDES
CARBON COMPOUNDS
CERAMICS
FABRICATION
GLASS
HOT PRESSING
MATERIALS WORKING
MELTING
METALLURGY
NITRIDES
NITROGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
POWDER METALLURGY
PRESSING
SILICON COMPOUNDS
SILICON NITRIDES
SINTERING
VACUUM MELTING