Method for fabricating boron carbide articles

Patent · Tue Jul 29 04:00:00 EDT 1980

OSTI ID:7063629

Ardary, Z; Reynolds, C

Described is a method for fabricating an essentially uniformly dense boron carbide article of a length-to-diameter or width ratio greater than 2 to 1 comprising the steps of providing a plurality of article segments to be joined together to form the article with each of said article segments having a length-to-diameter or width ratio less than 1.5 to 1. Each segment is fabricated by hot pressing a composition consisting of boron carbide powder at a pressure and temperature effective to provide the article segment with a density greater than about 85% of theoretical density, providing each article segment with parallel planar end surfaces, placing a plurality of said article segments in a hot-pressing die in a line with the planar surfaces of adjacent article segments being disposed in intimate contact, and hot pressing the aligned article segments at a temperature and pressure effective to provide said article with a density over the length thereof in the range of about 94 to 98 percent theoretical density and greater than the density provided in the discrete hot pressing of each of the article segments and to provide a bond between adjacent article segments with said bond being at least equivalent in hardness, strength and density to a remainder of said article.

• Assignee: Department of Energy
• Patent Number(s): US 4215088
• OSTI ID: 7063629
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200 -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
BONDING
BORON CARBIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
DENSITY
DIES
FABRICATION
FRACTURE PROPERTIES
HARDNESS
HOT PRESSING
JOINING
MATERIALS WORKING
MECHANICAL PROPERTIES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PISTONS
POWDERS
PRESSING
REFRACTIVITY
RODS
SURFACES