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

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:
Issue Date:
OSTI Identifier:
6266113
Assignee:
Univ. of California, Oakland, CA (United States) IMS; EDB-93-121162
Patent Number(s):
US 5240691; A
Application Number:
PPN: US 7-539392
Contract Number:
W-7405-ENG-48
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