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.
- 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